/* roulang page: index */
:root {
            --c-ink: #101315;
            --c-carbon: #17191C;
            --c-warm: #F5F2ED;
            --c-paper: #FAF8F5;
            --c-line-dark: rgba(255, 255, 255, .14);
            --c-line-light: #E4DED5;
            --c-txt-dark-hi: rgba(255, 255, 255, .92);
            --c-txt-dark-lo: rgba(255, 255, 255, .62);
            --c-txt-light-hi: #191C1F;
            --c-txt-light-lo: #5A5F64;
            --c-accent: #D29A46;
            --c-accent-hover: #E4AE5F;
            --c-succ: #3D8D71;
            --radius-l: 24px;
            --radius-m: 16px;
            --radius-s: 999px;
            --shadow-panel: 0 10px 34px rgba(20, 20, 20, .07);
            --transition: cubic-bezier(.22, .61, .36, 1);
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            background: var(--c-warm);
            color: var(--c-txt-light-hi);
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
            font-size: 16px;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color .25s var(--transition);
        }

        a:hover {
            color: var(--c-accent);
        }

        button,
        input {
            font-family: inherit;
        }

        .grid-container {
            max-width: 1200px;
        }

        section,
        footer {
            position: relative;
        }

        .section-pad {
            padding-top: clamp(64px, 9vw, 128px);
            padding-bottom: clamp(64px, 9vw, 128px);
        }

        .bg-warm {
            background: var(--c-warm);
        }

        .bg-paper {
            background: var(--c-paper);
        }

        .bg-dark {
            background: var(--c-ink);
            color: var(--c-txt-dark-hi);
        }

        .section-head {
            margin-bottom: 48px;
        }

        .section-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            font-size: 14px;
            font-weight: 600;
            letter-spacing: .08em;
            color: var(--c-accent);
            margin-bottom: 14px;
        }

        .section-eyebrow::before {
            content: "";
            display: inline-block;
            width: 28px;
            height: 1px;
            background: var(--c-accent);
        }

        .section-title {
            font-size: clamp(32px, 4.5vw, 56px);
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -.02em;
            margin: 0;
            color: var(--c-txt-light-hi);
        }

        .bg-dark .section-title {
            color: var(--c-txt-dark-hi);
        }

        .section-desc {
            margin-top: 22px;
            max-width: 720px;
            font-size: clamp(16px, 1.8vw, 20px);
            line-height: 1.85;
            color: var(--c-txt-light-lo);
        }

        .bg-dark .section-desc {
            color: var(--c-txt-dark-lo);
        }

        /* 悬浮导航 */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            padding: 16px 10px 0;
            pointer-events: none;
        }

        .nav-master {
            pointer-events: auto;
            max-width: min(1200px, calc(100% - 0px));
            width: 1200px;
            margin: 0 auto;
            min-height: 66px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 12px 18px;
            border-radius: 40px;
            background: transparent;
            border: 1px solid transparent;
            transition: background .3s var(--transition), box-shadow .3s var(--transition), border-color .3s var(--transition), max-width .35s var(--transition), width .35s var(--transition);
        }

        .site-header.is-scrolled {
            top: 8px;
        }

        .site-header.is-scrolled .nav-master {
            background: rgba(250, 248, 245, .76);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            width: min(1200px, calc(100% - 4px));
            max-width: 1200px;
            border-color: rgba(255, 255, 255, .6);
            box-shadow: 0 12px 38px rgba(16, 19, 21, .12);
        }

        .brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            transition: color .25s ease;
            flex-shrink: 0;
        }

        .brand-mark {
            width: 28px;
            height: 28px;
            border-radius: 9px;
            background: var(--c-accent);
            color: #101013;
            font-weight: 900;
            font-size: 16px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-feature-settings: "tnum";
            flex: 0 0 28px;
        }

        .brand-text {
            font-size: 21px;
            font-weight: 800;
            letter-spacing: -.01em;
            line-height: 1.2;
            white-space: nowrap;
        }

        .site-header.is-scrolled .brand {
            color: var(--c-txt-light-hi);
        }

        .site-header.is-scrolled .brand-mark {
            background: var(--c-accent);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            margin-left: auto;
            margin-right: 10px;
            color: rgba(255, 255, 255, .9);
        }

        .nav-link {
            padding: 10px 15px;
            border-radius: var(--radius-s);
            font-size: 15px;
            font-weight: 500;
            color: inherit;
            position: relative;
            white-space: nowrap;
        }

        .site-header.is-scrolled .main-nav {
            color: var(--c-txt-light-hi);
        }

        .nav-link:hover,
        .nav-link:focus-visible {
            color: var(--c-accent);
            outline: none;
        }

        .nav-link.is-active {
            color: var(--c-accent);
        }

        .nav-link.is-active::after {
            content: "";
            position: absolute;
            left: 15px;
            right: 15px;
            bottom: 5px;
            height: 2px;
            border-radius: 2px;
            background: var(--c-accent);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 999px;
            font-weight: 700;
            border: 1px solid transparent;
            cursor: pointer;
            transition: background .25s var(--transition), transform .25s var(--transition), box-shadow .25s var(--transition), border-color .25s;
            min-height: 46px;
            padding: 0 26px;
            font-size: 15px;
            line-height: 1;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(16, 19, 21, .08);
        }

        .btn:active {
            transform: translateY(0);
            box-shadow: none;
        }

        .btn:focus-visible {
            outline: none;
            box-shadow: 0 0 0 4px rgba(210, 154, 70, .24);
        }

        .btn-primary {
            background: var(--c-accent);
            color: #101013;
        }

        .btn-primary:hover {
            background: var(--c-accent-hover);
            color: #101013;
        }

        .btn-ghost {
            background: transparent;
            border-color: rgba(255, 255, 255, .4);
            color: #fff;
        }

        .btn-ghost:hover {
            border-color: var(--c-accent);
            color: var(--c-accent);
            background: rgba(210, 154, 70, .06);
        }

        .bg-particle .btn-ghost, .btn-ghost.on-light {
            border-color: #CFC7BB;
            color: var(--c-txt-light-hi);
        }

        .btn-dark {
            background: var(--c-ink);
            color: #fff;
            border-color: var(--c-ink);
        }

        .btn-dark:hover {
            background: #20242A;
            color: #fff;
        }

        .btn-sm {
            padding: 0 20px;
            min-height: 40px;
            font-size: 14px;
        }

        .nav-burger {
            display: none;
            width: 42px;
            height: 42px;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, .36);
            background: rgba(255, 255, 255, .05);
            color: #fff;
            cursor: pointer;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            line-height: 1;
            margin-left: 4px;
        }

        .site-header.is-scrolled .nav-burger {
            border-color: #D6CFC6;
            color: #24282C;
        }

        /* Hero */
        .hero {
            min-height: 100vh;
            background-color: var(--c-ink);
            background-image: linear-gradient(85deg, rgba(16, 19, 21, .96) 0%, rgba(16, 19, 21, .82) 44%, rgba(16, 19, 21, .55) 90%), url('/assets/images/backpic/back-1.webp');
            background-position: center;
            background-size: cover;
            color: #fff;
            display: flex;
            align-items: center;
            overflow: hidden;
        }

        .hero-grid {
            padding-top: 110px;
            padding-bottom: 42px;
            width: 100%;
        }

        .hero-kicker {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            letter-spacing: .12em;
            color: var(--c-accent);
            margin-bottom: 24px;
            font-weight: 600;
        }

        .hero-kicker::before {
            content: "";
            display: block;
            width: 24px;
            height: 1px;
            background: var(--c-accent);
        }

        .hero-headline {
            font-size: clamp(46px, 7vw, 96px);
            font-weight: 900;
            line-height: 1.04;
            letter-spacing: -.02em;
            margin: 0 0 28px;
            max-width: 10em;
            text-wrap: pretty;
            color: #fff;
        }

        .hero-lead {
            font-size: clamp(16px, 2vw, 22px);
            line-height: 1.8;
            color: rgba(255, 255, 255, .72);
            max-width: 620px;
            margin-bottom: 0;
        }

        .hero-actions {
            position: relative;
        }

        .hero-actions-inner {
            margin-top: 116px;
            padding-left: clamp(16px, 4vw, 56px);
        }

        .hero-actions-inner .btn {
            width: 100%;
            min-height: 58px;
            margin-bottom: 14px;
            font-size: 17px;
        }

        .source-note {
            font-size: 13px;
            color: rgba(255, 255, 255, .46);
            margin: 12px 0 0;
            font-feature-settings: 'tnum';
        }

        .hero-score-note {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 18px;
            color: rgba(255, 255, 255, .9);
        }

        .hero-score-note .stars {
            color: var(--c-accent);
            letter-spacing: 2px;
            font-size: 13px;
        }

        .hero-scroll-hint {
            position: absolute;
            left: 50%;
            bottom: 20px;
            color: rgba(255, 255, 255, .4);
            font-size: 12px;
            letter-spacing: .1em;
            transform: translateX(-50%);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .hero-scroll-hint::after {
            content: "";
            width: 1px;
            height: 36px;
            background: linear-gradient(to bottom, rgba(255, 255, 255, .4), rgba(255, 255, 255, .05));
        }

        /* 数据带 */
        .stats-strip {
            background: var(--c-ink);
            color: var(--c-txt-dark-hi);
            border-top: 1px solid var(--c-line-dark);
            padding: 0 0 42px;
        }

        .stats-list {
            border-left: 1px solid var(--c-line-dark);
        }

        .stat-cell {
            padding: 24px 32px 20px 0;
            border-right: 1px solid var(--c-line-dark);
            min-height: 106px;
        }

        .stat-number {
            display: block;
            font-size: clamp(24px, 2.8vw, 48px);
            font-weight: 900;
            letter-spacing: -.03em;
            font-feature-settings: 'tnum';
            color: #fff;
            line-height: 1.1;
            margin-bottom: 6px;
        }

        .stat-label {
            font-size: 14px;
            color: var(--c-txt-dark-lo);
            line-height: 1.5;
        }

        /* 通用 section */
        .index-panel {
            background: var(--c-warm);
        }

        .deep-card {
            background: var(--c-carbon);
            border: 1px solid var(--c-line-dark);
            border-radius: var(--radius-l);
        }

        /* 核心内容 2x2 */
        .core-intro {
            padding-top: clamp(64px, 9vw, 128px);
            padding-bottom: 24px;
        }

        .core-left {
            padding-right: 52px;
        }

        .core-left p {
            color: var(--c-txt-light-lo);
            font-size: 17px;
            line-height: 1.9;
            margin-top: 18px;
        }

        .core-list {
            margin-top: 40px;
            list-style: none;
            padding: 0;
        }

        .core-list li {
            display: flex;
            gap: 18px;
            padding: 22px 0;
            border-bottom: 1px solid var(--c-line-light);
        }

        .core-list li:first-child {
            padding-top: 6px;
        }

        .core-num {
            min-width: 34px;
            font-size: 13px;
            font-weight: 700;
            color: var(--c-accent);
            font-feature-settings: 'tnum';
            padding-top: 3px;
        }

        .core-list h3 {
            font-size: 19px;
            font-weight: 700;
            margin: 0 0 5px;
        }

        .core-list p {
            margin: 0;
            font-size: 15px;
            color: var(--c-txt-light-lo);
            max-width: 58ch;
        }

        .core-preview {
            margin-top: 8px;
        }

        .core-preview img {
            border-radius: 22px;
            box-shadow: var(--shadow-panel);
            object-fit: cover;
            width: 100%;
            max-height: 460px;
            height: auto;
        }

        /* 截图走带 */
        .shot-wrap {
            background: var(--c-warm);
            padding-bottom: clamp(64px, 9vw, 128px);
        }

        .shot-stage {
            position: relative;
            margin-top: 16px;
        }

        .shot-counter {
            position: absolute;
            right: 4px;
            top: -52px;
            display: flex;
            align-items: baseline;
            gap: 6px;
            font-feature-settings: 'tnum';
            color: var(--c-txt-light-lo);
            z-index: 2;
        }

        .shot-counter .now {
            font-size: 22px;
            font-weight: 800;
            color: var(--c-txt-light-hi);
        }

        .shot-track {
            display: flex;
            gap: 24px;
            overflow-x: auto;
            scroll-snap-type: x mandatory;
            padding: 6px 4px 28px;
            scrollbar-width: none;
        }

        .shot-track::-webkit-scrollbar {
            display: none;
        }

        .shot-card {
            flex: 0 0 min(360px, 82vw);
            scroll-snap-align: start;
            border-radius: 20px;
            overflow: hidden;
            background: var(--c-paper);
            border: 1px solid var(--c-line-light);
            box-shadow: 0 16px 40px rgba(16, 19, 21, .06);
            transition: transform .4s var(--transition), border-color .3s;
        }

        .shot-card:hover {
            transform: translateY(-6px);
            border-color: rgba(210, 154, 70, .46);
        }

        .shot-card .figure-box {
            position: relative;
            min-height: 230px;
            max-height: 320px;
            overflow: hidden;
        }

        .shot-card img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .6s var(--transition);
        }

        .shot-card:hover img {
            transform: scale(1.03);
        }

        .shot-label {
            position: absolute;
            left: 14px;
            bottom: 14px;
            z-index: 3;
            color: #fff;
            background: rgba(16, 19, 21, .68);
            backdrop-filter: blur(8px);
            border-radius: 999px;
            padding: 6px 14px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: .02em;
        }

        .shot-caption {
            padding: 18px 20px 22px;
        }

        .shot-caption h3 {
            font-size: 18px;
            margin: 0;
            font-weight: 700;
        }

        .shot-caption p {
            font-size: 14px;
            color: var(--c-txt-light-lo);
            margin: 6px 0 0;
            line-height: 1.7;
        }

        .shot-track.dragging {
            scroll-snap-type: none;
        }

        /* 系统要求 */
        .spec-section {
            background: var(--c-ink);
            color: var(--c-txt-dark-hi);
            overflow: hidden;
        }

        .spec-wrapper {
            border-radius: var(--radius-l);
            border: 1px solid var(--c-line-dark);
            background: var(--c-carbon);
            padding: clamp(24px, 4vw, 50px);
        }

        .spec-graph {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin-top: 20px;
        }

        .metric {
            border-left: 1px solid var(--c-line-dark);
            padding-left: 16px;
            min-height: 70px;
        }

        .metric strong {
            display: block;
            font-size: 18px;
            color: #fff;
            font-weight: 700;
        }

        .metric span {
            font-size: 13px;
            color: var(--c-txt-dark-lo);
        }

        .spec-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 10px;
            font-size: 16px;
        }

        .spec-table th,
        .spec-table td {
            text-align: left;
            padding: 18px 10px 18px 0;
            border-bottom: 1px solid var(--c-line-dark);
            vertical-align: top;
        }

        .spec-table th {
            font-weight: 600;
            color: var(--c-accent);
            width: 130px;
        }

        .spec-table td {
            color: rgba(255, 255, 255, .82);
        }

        .spec-table small {
            display: block;
            color: var(--c-txt-dark-lo);
            font-size: 13px;
            margin-top: 4px;
        }

        .spec-side {
            padding-left: 10px;
        }

        .spec-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 14px;
        }

        .tag-outline {
            border: 1px solid rgba(210, 154, 70, .5);
            color: var(--c-accent);
            border-radius: 999px;
            padding: 3px 10px;
            font-size: 12px;
        }

        /* 评价墙 */
        .review-area {
            background: var(--c-warm);
        }

        .review-grid {
            display: grid;
            grid-template-columns: 1.2fr 1fr 1fr;
            gap: 20px;
            align-items: stretch;
        }

        .review-card {
            background: var(--c-paper);
            border: 1px solid var(--c-line-light);
            border-radius: 20px;
            padding: 26px;
            box-shadow: 0 6px 24px rgba(20, 20, 20, .04);
        }

        .review-feature {
            grid-row: span 2;
            background: var(--c-ink);
            border-color: transparent;
            color: #fff;
        }

        .review-feature .review-stars {
            color: var(--c-accent);
            font-size: 18px;
        }

        .review-feature blockquote {
            margin: 22px 0;
            font-size: 24px;
            line-height: 1.7;
            font-weight: 600;
        }

        .review-feature .review-content {
            font-size: 17px;
            line-height: 1.95;
            color: rgba(255, 255, 255, .82);
        }

        .review-head {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 14px;
        }

        .avatar-round {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(210, 154, 70, .15);
            color: var(--c-accent);
            font-weight: 800;
            flex: 0 0 42px;
            font-size: 15px;
        }

        .review-stars {
            color: var(--c-accent);
            letter-spacing: 2px;
            font-size: 13px;
            margin-left: auto;
        }

        .review-person {
            font-weight: 700;
            font-size: 15px;
        }

        .review-source {
            font-size: 12px;
            color: var(--c-txt-light-lo);
        }

        .review-card p {
            margin: 0;
            font-size: 15px;
            color: var(--c-txt-light-lo);
            line-height: 1.8;
        }

        .review-feature p {
            color: rgba(255, 255, 255, .75);
        }

        /* 内容区域 */
        .news-section {
            background: var(--c-paper);
        }

        .news-panel {
            border-radius: var(--radius-l);
            background: var(--c-warm);
            border: 1px solid var(--c-line-light);
            overflow: hidden;
        }

        .news-intro {
            background: var(--c-ink);
            padding: 42px clamp(30px, 5vw, 70px);
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: center;
            color: #fff;
            min-height: 320px;
        }

        .news-intro h2 {
            font-size: clamp(28px, 4vw, 46px);
            line-height: 1.25;
            margin-bottom: 22px;
        }

        .news-intro p {
            color: rgba(255, 255, 255, .62);
            max-width: 56ch;
            margin: 0;
        }

        .news-list-wrap {
            display: flex;
            flex-direction: column;
        }

        .news-card {
            display: block;
            padding: 24px 28px;
            border-bottom: 1px solid var(--c-line-light);
            transition: background .25s ease;
        }

        .news-card:last-child {
            border-bottom: 0;
        }

        .news-card:hover {
            background: rgba(210, 154, 70, .04);
        }

        .news-card:hover .news-title {
            color: var(--c-accent);
        }

        .news-meta {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 7px;
        }

        .cat-pill {
            display: inline-flex;
            background: rgba(210, 154, 70, .14);
            color: var(--c-accent);
            border-radius: 999px;
            padding: 3px 12px;
            font-size: 12px;
            font-weight: 700;
        }

        .date-text {
            font-size: 13px;
            color: var(--c-txt-light-lo);
        }

        .news-title {
            font-size: 18px;
            line-height: 1.5;
            font-weight: 700;
            margin: 0 0 5px;
            transition: color .25s ease;
        }

        .news-card p {
            margin: 0;
            color: var(--c-txt-light-lo);
            font-size: 14px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .empty-state {
            text-align: center;
            padding: 44px 18px;
            color: var(--c-txt-light-lo);
        }

        .news-btn {
            padding: 24px 28px;
            text-align: right;
        }

        /* CTA DOWNLOAD */
        .download-cta {
            background: var(--c-ink);
            color: #fff;
            overflow: hidden;
        }

        .download-cta::before {
            content: "";
            position: absolute;
            inset: 0;
            background: radial-gradient(60% 80% at 85% 50%, rgba(210, 154, 70, .11), transparent 70%);
            pointer-events: none;
        }

        .cta-inner {
            position: relative;
            z-index: 1;
            padding: clamp(56px, 8vw, 120px) 0;
        }

        .cta-title {
            font-size: clamp(34px, 5vw, 60px);
            font-weight: 900;
            line-height: 1.15;
            margin: 0 0 16px;
        }

        .cta-desc {
            max-width: 620px;
            color: rgba(255, 255, 255, .64);
            font-size: 17px;
            line-height: 1.85;
            margin: 0 0 38px;
        }

        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }

        .cta-version {
            margin-top: 28px;
            font-size: 13px;
            color: rgba(255, 255, 255, .42);
            font-feature-settings: 'tnum';
        }

        .cta-scan {
            background: rgba(255, 255, 255, .04);
            border: 1px solid rgba(255, 255, 255, .16);
            padding: 16px;
            border-radius: 24px;
            max-width: 280px;
            margin-left: auto;
        }

        .cta-scan img {
            border-radius: 16px;
            max-height: 210px;
            width: 100%;
            object-fit: cover;
        }

        .cta-scan .scan-note {
            font-size: 12px;
            text-align: center;
            color: rgba(255, 255, 255, .55);
            margin: 8px 0 0;
        }

        /* FAQ */
        .faq-section {
            background: var(--c-warm);
        }

        .faq-list {
            max-width: 880px;
            margin: 0 auto;
            border-top: 1px solid var(--c-line-light);
        }

        .faq-item {
            border-bottom: 1px solid var(--c-line-light);
        }

        .faq-item summary {
            list-style: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 22px 8px;
            min-height: 60px;
            font-size: 17px;
            font-weight: 700;
            color: var(--c-txt-light-hi);
            transition: color .25s ease, background .25s ease;
        }

        .faq-item summary:hover,
        .faq-item summary:focus-visible {
            outline: none;
            background: rgba(210, 154, 70, .06);
            color: var(--c-accent);
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-icon {
            width: 24px;
            height: 24px;
            flex: 0 0 24px;
            border-radius: 50%;
            border: 1px solid var(--c-line-light);
            color: var(--c-accent);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            transition: background .2s ease;
        }

        .faq-item[open] .faq-icon {
            background: var(--c-accent);
            color: #101013;
            border-color: var(--c-accent);
        }

        .faq-answer {
            padding: 0 24px 26px;
            margin: 0;
            color: var(--c-txt-light-lo);
            line-height: 1.9;
            max-width: 840px;
        }

        /* Footer */
        .footer {
            background: var(--c-ink);
            color: rgba(255, 255, 255, .7);
        }

        .footer-panel {
            padding-top: clamp(48px, 7vw, 84px);
            padding-bottom: 28px;
        }

        .footer-brand {
            font-size: 22px;
            font-weight: 800;
            color: #fff;
        }

        .footer-desc {
            color: rgba(255, 255, 255, .42);
            font-size: 14px;
            margin: 16px 0 0;
            max-width: 36ch;
        }

        .footer-head {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }

        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 7px;
            font-size: 14px;
        }

        .footer-links a {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            width: fit-content;
        }

        .footer-links a:hover {
            color: var(--c-accent);
        }

        .footer-extra {
            border-top: 1px solid var(--c-line-dark);
            padding: 18px 0 22px;
            font-size: 13px;
            color: rgba(255, 255, 255, .36);
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: space-between;
        }

        /* backtop */
        .backtop {
            position: fixed;
            bottom: 22px;
            right: 22px;
            z-index: 900;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: rgba(16, 19, 21, .86);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(255, 255, 255, .25);
            backdrop-filter: blur(10px);
            box-shadow: 0 10px 28px rgba(0, 0, 0, .18);
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transform: translateY(12px);
            transition: opacity .25s, visibility .25s, transform .25s;
        }

        .backtop.is-visible {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .backtop:hover {
            color: var(--c-accent);
            border-color: var(--c-accent);
        }

        /* desktop menu fine */
        .mobile-close-btn {
            display: none;
        }

        @media screen and (max-width: 1023px) {
            .main-nav {
                position: fixed;
                top: 10px;
                right: 4vw;
                width: min(560px, 92vw);
                max-width: 92vw;
                min-height: 100vh;
                min-height: 100dvh;
                margin: 0;
                background: var(--c-warm);
                color: var(--c-txt-light-hi);
                flex-direction: column;
                align-items: stretch;
                align-content: flex-start;
                border-radius: 28px;
                padding: 78px 28px 28px;
                box-shadow: 0 20px 60px rgba(0, 0, 0, .14);
                transform: translateY(-4px) scale(1.01);
                opacity: 0;
                visibility: hidden;
                pointer-events: none;
                transition: transform .32s var(--transition), opacity .28s, visibility .28s;
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                overflow-y: auto;
                z-index: 100;
            }

            .main-nav.is-open {
                transform: translateY(0) scale(1);
                opacity: 1;
                visibility: visible;
                pointer-events: auto;
            }

            .main-nav .nav-link {
                font-size: 17px;
                padding: 15px 8px;
                border-bottom: 1px solid var(--c-line-light);
                border-radius: 0;
                white-space: normal;
            }

            .main-nav .nav-link.is-active::after {
                display: none;
            }

            .nav-link.is-active {
                color: var(--c-accent);
                font-weight: 700;
            }

            .nav-burger {
                display: inline-flex;
            }

            .brand-text {
                font-size: 19px;
            }

            .mobile-close-btn {
                display: inline-flex;
                position: absolute;
                top: 20px;
                right: 20px;
                width: 38px;
                height: 38px;
                border-radius: 50%;
                align-items: center;
                justify-content: center;
                border: 1px solid var(--c-line-light);
                background: transparent;
                color: #24282C;
                cursor: pointer;
                z-index: 2;
            }

            .header-actions .btn-primary {
                display: none;
            }
        }

        @media screen and (max-width: 767px) {
            .hero-grid {
                padding-top: 96px;
                padding-bottom: 24px;
                display: flex;
                flex-direction: column;
            }

            .hero-actions-inner {
                margin-top: 34px;
                padding-left: 0;
                max-width: 480px;
            }

            .hero-lead {
                font-size: 16px;
            }

            .hero-headline {
                font-size: clamp(40px, 10vw, 70px);
            }

            .stat-cell {
                padding-right: 20px;
            }

            .stats-list {
                border-left: 0;
            }

            .core-left {
                padding-right: 0;
            }

            .review-grid {
                grid-template-columns: 1fr;
            }

            .review-feature {
                grid-row: span 1;
            }

            .news-intro {
                min-height: 220px;
            }

            .cta-scan {
                max-width: 220px;
                margin: 36px 0 0;
            }

            .spec-wrapper {
                padding: 24px 20px;
            }

            .spec-table th {
                width: 90px;
                font-size: 14px;
            }

            .spec-table td {
                font-size: 14px;
            }

            .spec-graph {
                grid-template-columns: 1fr;
            }

            .cta-actions .btn {
                width: 100%;
            }

            .footer-extra {
                justify-content: center;
                text-align: center;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                scroll-behavior: auto !important;
                transition-duration: .01ms !important;
                animation-duration: .01ms !important;
            }
        }

/* roulang page: article */
:root {
  --c-ink: #101315;
  --c-carbon: #17191C;
  --c-warm: #F5F2ED;
  --c-paper: #FAF8F5;
  --c-line-dark: rgba(255,255,255,.14);
  --c-line-light: #E4DED5;
  --c-txt-dark: rgba(255,255,255,.92);
  --c-txt-dark-2: rgba(255,255,255,.64);
  --c-txt-light: #191C1F;
  --c-txt-muted: #5A5F64;
  --c-accent: #D29A46;
  --c-accent-hover: #E4AE5F;
  --c-succ: #3D8D71;
  --r-lg: 24px;
  --r-card: 16px;
  --r-btn: 999px;
  --shadow-card: 0 8px 30px rgba(20,20,20,.06);
  --ease: cubic-bezier(.22, .61, .36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--c-warm);
  color: var(--c-txt-light);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color .3s var(--ease);
}

.grid-container {
  max-width: 1200px;
  padding-left: 20px;
  padding-right: 20px;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  padding-top: 16px;
  pointer-events: none;
}

.site-header .grid-container {
  pointer-events: auto;
}

.nav-master {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 8px 10px 8px 18px;
  background: rgba(250, 248, 245, .82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid rgba(228, 222, 213, .78);
  border-radius: var(--r-btn);
  box-shadow: 0 10px 32px rgba(0,0,0,.05);
  transition: box-shadow .3s var(--ease), background .3s var(--ease);
}

.site-header.scrolled .nav-master {
  box-shadow: 0 16px 40px rgba(20,20,20,.12);
  background: rgba(250, 248, 245, .94);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 13px;
  background: var(--c-ink);
  color: #fff;
  font-size: 21px;
  font-weight: 900;
  letter-spacing: 0;
  transition: background .3s var(--ease), color .3s var(--ease);
}

.brand:hover .brand-mark {
  background: var(--c-accent);
  color: #101315;
}

.brand-text {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--c-txt-light);
  white-space: nowrap;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0;
}

.mobile-close-btn {
  display: none;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-radius: var(--r-btn);
  font-size: 15px;
  font-weight: 600;
  color: var(--c-txt-light);
  white-space: nowrap;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  background: var(--c-accent);
  transform: translateX(-50%);
  border-radius: 99px;
  transition: width .3s var(--ease);
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--c-accent);
}

.nav-link.is-active::after {
  width: 60%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-burger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--c-line-light);
  background: transparent;
  border-radius: 999px;
  font-size: 18px;
  color: var(--c-txt-light);
  cursor: pointer;
  transition: border-color .3s var(--ease), color .3s var(--ease);
}

.nav-burger:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--r-btn);
  font-weight: 700;
  letter-spacing: .02em;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background .3s var(--ease), color .3s var(--ease), border-color .3s var(--ease), transform .3s var(--ease), box-shadow .3s var(--ease);
}

.btn-primary {
  background: var(--c-accent);
  color: #101315;
  border-color: var(--c-accent);
}

.btn-primary:hover {
  background: var(--c-accent-hover);
  border-color: var(--c-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(210, 154, 70, .22);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn-secondary {
  background: transparent;
  color: rgba(255,255,255,.92);
  border-color: rgba(255,255,255,.35);
}

.btn-secondary:hover {
  border-color: var(--c-accent);
  color: var(--c-accent-hover);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 9px 20px;
  font-size: 14px;
  min-height: 38px;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 16px;
  min-height: 54px;
}

.article-page {
  background: var(--c-warm);
  overflow: hidden;
}

.post-hero {
  position: relative;
  background: linear-gradient(130deg, rgba(16, 19, 21, .97) 0%, rgba(23, 24, 26, .9) 68%), url("/assets/images/backpic/back-2.png") center / cover no-repeat;
  padding: 150px 0 70px;
  color: var(--c-txt-dark);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 36px;
  font-size: 14px;
  color: var(--c-txt-dark-2);
}

.breadcrumb a {
  color: var(--c-txt-dark-2);
}

.breadcrumb a:hover {
  color: var(--c-accent-hover);
}

.crumb-icon {
  opacity: .55;
  font-size: 12px;
}

.crumb-current {
  color: var(--c-txt-dark);
}

.post-title-row {
  align-items: flex-end;
}

.post-title {
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: .01em;
  margin: 0;
  color: #fff;
  max-width: 98%;
}

.post-hero-badge {
  text-align: left;
  padding-bottom: 8px;
}

.official-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(210, 154, 70, .5);
  color: var(--c-accent-hover);
  background: rgba(210, 154, 70, .08);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 999px;
}

.post-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 40px;
  border-top: 1px solid var(--c-line-dark);
  padding-top: 22px;
}

.meta-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.article-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(210, 154, 70, .18);
  color: var(--c-accent-hover);
  font-size: 18px;
  font-weight: 800;
}

.meta-author {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,.9);
  font-weight: 600;
}

.meta-source {
  display: block;
  font-size: 12px;
  color: var(--c-txt-dark-2);
}

.meta-right {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 24px;
  font-size: 13px;
  color: var(--c-txt-dark-2);
}

.meta-right span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.article-main {
  background: var(--c-warm);
  padding: 80px 0 54px;
}

.article-body {
  padding: 24px 0;
}

.article-sheet {
  background: var(--c-paper);
  border: 1px solid var(--c-line-light);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-card);
  padding: clamp(28px, 5vw, 64px);
  margin-bottom: 40px;
}

.article-prose {
  font-size: 17px;
  line-height: 1.95;
  color: #26292D;
  word-break: break-word;
}

.article-prose > * + * {
  margin-top: 24px;
}

.article-prose p {
  margin: 0 0 28px;
  text-align: left;
}

.article-prose h1,
.article-prose h2,
.article-prose h3,
.article-prose h4 {
  color: var(--c-ink);
  font-weight: 800;
  line-height: 1.4;
  margin-top: 52px;
  margin-bottom: 18px;
}

.article-prose h1 {
  font-size: clamp(28px, 4vw, 36px);
}

.article-prose h2 {
  font-size: clamp(24px, 3.4vw, 32px);
}

.article-prose h3 {
  font-size: 22px;
}

.article-prose h4 {
  font-size: 18px;
}

.article-prose a {
  color: #8A5A1B;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-prose a:hover {
  color: var(--c-ink);
}

.article-prose ul,
.article-prose ol {
  padding-left: 1.2em;
  margin-bottom: 28px;
}

.article-prose li {
  margin: 8px 0;
}

.article-prose blockquote {
  margin: 36px 0;
  padding: 6px 0 6px 26px;
  border-left: 2px solid var(--c-accent);
  color: var(--c-txt-muted);
  font-style: normal;
}

.article-prose img {
  border-radius: 18px;
  margin: 32px 0;
}

.article-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
  font-size: 15px;
  border-radius: 12px;
  overflow: hidden;
}

.article-prose table th,
.article-prose table td {
  border: 1px solid var(--c-line-light);
  padding: 12px 14px;
  text-align: left;
}

.article-prose table th {
  background: #F1EDE6;
  font-weight: 700;
}

.article-prose pre {
  background: var(--c-carbon);
  color: rgba(255,255,255,.92);
  border-radius: 16px;
  padding: 22px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.6;
}

.article-prose code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--c-line-light);
}

.tags-label {
  font-size: 14px;
  color: var(--c-txt-muted);
  font-weight: 600;
}

.tag-item {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  font-size: 13px;
  background: rgba(210, 154, 70, .08);
  color: #86591A;
  border: 1px solid rgba(210, 154, 70, .2);
  border-radius: 999px;
  transition: all .3s var(--ease);
}

.tag-item:hover {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #101315;
}

.empty-article {
  padding: 28px 0;
}

.empty-article h1 {
  font-size: 30px;
  font-weight: 800;
  margin-bottom: 16px;
}

.empty-article p {
  color: var(--c-txt-muted);
  max-width: 640px;
}

.empty-article .btn {
  margin-top: 20px;
}

.aside-sticky {
  position: sticky;
  top: 110px;
}

.aside-card {
  background: var(--c-paper);
  border: 1px solid var(--c-line-light);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  margin-bottom: 24px;
}

.aside-cover {
  position: relative;
}

.aside-cover img {
  width: 100%;
  aspect-ratio: 16 / 11;
  object-fit: cover;
}

.aside-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 45%, rgba(16,19,21,.5) 100%);
}

.aside-cover-caption {
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 16px;
  color: #fff;
  font-size: 18px;
  font-weight: 800;
  z-index: 2;
}

.aside-card-body {
  padding: 24px;
}

.aside-card-body h3 {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 800;
}

.aside-card-body p {
  margin: 0 0 18px;
  font-size: 14px;
  color: var(--c-txt-muted);
  line-height: 1.8;
}

.aside-list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--c-line-light);
}

.aside-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 0;
  border-bottom: 1px solid var(--c-line-light);
  font-size: 14px;
  color: var(--c-txt-muted);
}

.aside-list i {
  color: var(--c-accent);
  font-size: 13px;
  width: 18px;
  text-align: center;
}

.cta-mini {
  width: 100%;
  margin-top: 14px;
}

.cta-mini .btn {
  width: 100%;
}

.section-divider {
  width: 100%;
  height: 1px;
  background: var(--c-line-light);
  margin: 0;
  border: 0;
}

.route-preview {
  background: var(--c-paper);
  padding: clamp(64px, 9vw, 120px) 0;
}

.section-head {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 48px;
}

.section-head .eyebrow {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--c-accent);
  display: inline-flex;
  margin-top: 12px;
  flex-shrink: 0;
  border: 1px solid rgba(210, 154, 70, .25);
  padding: 4px 12px;
  border-radius: 999px;
}

.section-head h2 {
  font-size: clamp(28px, 3.8vw, 42px);
  font-weight: 800;
  line-height: 1.3;
  margin: 0;
}

.route-card {
  display: block;
  height: 100%;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--c-line-light);
  background: var(--c-warm);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .35s var(--ease);
}

.route-card:hover {
  transform: translateY(-6px);
  border-color: rgba(210, 154, 70, .6);
  box-shadow: 0 24px 48px rgba(20,20,20,.09);
}

.route-card-cover {
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.route-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s var(--ease);
}

.route-card:hover .route-card-cover img {
  transform: scale(1.04);
}

.route-card-body {
  padding: 24px;
}

.route-card-body h3 {
  font-size: 20px;
  font-weight: 800;
  margin: 0 0 8px;
  line-height: 1.5;
}

.route-card-body p {
  margin: 0;
  color: var(--c-txt-muted);
  font-size: 14px;
  line-height: 1.8;
}

.route-card.is-dark {
  background: var(--c-ink);
  border-color: var(--c-ink);
  color: #fff;
}

.route-card.is-dark .route-card-body p {
  color: var(--c-txt-dark-2);
}

.faq-section {
  background: var(--c-warm);
  padding: clamp(70px, 9vw, 120px) 0;
}

.faq-wrap {
  max-width: 860px;
}

.faq-head {
  margin-bottom: 38px;
}

.faq-head h2 {
  font-size: clamp(28px, 3.8vw, 44px);
  font-weight: 800;
  margin: 0 0 12px;
}

.faq-head p {
  color: var(--c-txt-muted);
  font-size: 16px;
  margin: 0;
}

.faq-item {
  background: var(--c-paper);
  border: 1px solid var(--c-line-light);
  border-radius: var(--r-card);
  padding: 0;
  margin-bottom: 16px;
  overflow: hidden;
  transition: border-color .3s var(--ease);
}

.faq-item:hover {
  border-color: rgba(210, 154, 70, .45);
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-txt-light);
  background: var(--c-paper);
  border: 0;
  transition: background .3s var(--ease);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary .faq-icon {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--c-line-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--c-accent);
  font-size: 14px;
  transition: transform .3s var(--ease), background .3s var(--ease), color .3s var(--ease);
}

.faq-item summary:hover {
  background: rgba(210, 154, 70, .06);
}

.faq-item[open] summary .faq-icon {
  transform: rotate(45deg);
  background: var(--c-accent);
  color: #101315;
  border-color: var(--c-accent);
}

.faq-item .faq-answer {
  padding: 0 24px 24px;
  color: var(--c-txt-muted);
  font-size: 15px;
  line-height: 1.9;
}

.download-band {
  position: relative;
  background: linear-gradient(140deg, rgba(16,19,21,.98), rgba(16,19,21,.88)), url("/assets/images/backpic/back-1.webp") center / cover no-repeat;
  padding: clamp(70px, 9vw, 130px) 0;
  color: #fff;
}

.download-band .grid-x {
  align-items: center;
  row-gap: 40px;
}

.download-copy h2 {
  font-size: clamp(30px, 4.4vw, 54px);
  font-weight: 900;
  line-height: 1.25;
  margin: 0 0 18px;
}

.download-copy p {
  font-size: 17px;
  color: var(--c-txt-dark-2);
  max-width: 620px;
  line-height: 1.9;
  margin: 0;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 30px;
}

.download-note {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  color: var(--c-txt-dark-2);
  font-size: 13px;
  margin-top: 20px;
}

.download-note span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.download-note i {
  color: var(--c-accent);
}

.qr-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: rgba(255,255,255,.05);
  border: 1px solid var(--c-line-dark);
  border-radius: var(--r-lg);
  padding: 30px;
  max-width: 260px;
  margin-left: auto;
}

.qr-icon {
  width: 88px;
  height: 88px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  color: #101315;
  border-radius: 18px;
  font-size: 44px;
}

.qr-block span {
  color: var(--c-txt-dark);
  font-size: 14px;
  text-align: center;
  line-height: 1.7;
}

.qr-block .qr-sub {
  color: var(--c-txt-dark-2);
  font-size: 12px;
}

.footer {
  background: var(--c-ink);
  color: rgba(255,255,255,.82);
  padding: 70px 0 28px;
}

.footer-panel {
  gap: 40px 20px;
  padding-bottom: 44px;
  border-bottom: 1px solid var(--c-line-dark);
}

.footer-brand {
  font-size: 28px;
  font-weight: 900;
  color: #fff;
  margin-bottom: 14px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.9;
  color: rgba(255,255,255,.58);
  max-width: 420px;
  margin: 0;
}

.footer-head {
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  margin: 6px 0 20px;
  letter-spacing: .05em;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255,255,255,.68);
}

.footer-links a:hover {
  color: var(--c-accent-hover);
}

.footer-extra {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  padding-top: 26px;
  color: rgba(255,255,255,.42);
  font-size: 13px;
}

@media screen and (max-width: 1023px) {
  .nav-burger {
    display: inline-flex;
  }

  .header-actions .btn-primary {
    display: none;
  }

  .main-nav {
    position: fixed;
    top: 14px;
    right: 14px;
    width: min(92vw, 420px);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 4px;
    background: rgba(250, 248, 245, .96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--c-line-light);
    border-radius: 24px;
    padding: 22px;
    margin: 0;
    transform: translateX(calc(100% + 40px));
    visibility: hidden;
    opacity: 0;
    transition: opacity .35s var(--ease), transform .35s var(--ease), visibility .35s var(--ease);
    box-shadow: 0 30px 80px rgba(0,0,0,.2);
    z-index: 200;
  }

  .main-nav.is-open {
    transform: translateX(0);
    visibility: visible;
    opacity: 1;
  }

  .mobile-close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    margin: 0 0 14px auto;
    border-radius: 50%;
    border: 1px solid var(--c-line-light);
    background: transparent;
    color: var(--c-txt-muted);
    font-size: 18px;
    cursor: pointer;
    transition: color .3s var(--ease), border-color .3s var(--ease);
  }

  .mobile-close-btn:hover {
    color: var(--c-accent);
    border-color: var(--c-accent);
  }

  .nav-link {
    padding: 14px 12px;
    border-bottom: 1px solid rgba(228,222,213,.7);
    border-radius: 0;
    font-size: 16px;
  }

  .nav-link.is-active::after {
    left: 12px;
    bottom: 8px;
    transform: none;
    width: 34px;
  }

  .nav-link:last-child {
    border-bottom: 0;
  }

  .post-hero {
    padding-top: 132px;
  }

  .post-title-row {
    align-items: flex-start;
    row-gap: 20px;
  }

  .post-hero-badge {
    padding-left: 0;
  }

  .qr-block {
    margin-left: 0;
    max-width: 100%;
    width: 100%;
    flex-direction: row;
  }
}

@media screen and (max-width: 767px) {
  .grid-container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .nav-master {
    min-height: 60px;
    padding-left: 14px;
  }

  .brand-text {
    font-size: 17px;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
    font-size: 18px;
    border-radius: 11px;
  }

  .post-hero {
    padding-bottom: 56px;
    padding-top: 118px;
  }

  .post-title {
    font-size: 32px;
  }

  .post-meta-row {
    margin-top: 28px;
    flex-direction: column;
    align-items: flex-start;
  }

  .article-main {
    padding-top: 40px;
    padding-bottom: 30px;
  }

  .article-sheet {
    padding: 22px 18px;
  }

  .article-prose {
    font-size: 16px;
  }

  .section-head {
    flex-direction: column;
    gap: 12px;
  }

  .section-head .eyebrow {
    margin-top: 0;
  }

  .download-actions .btn {
    width: 100%;
  }

  .footer-extra {
    flex-direction: column;
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}

/* roulang page: category1 */
:root {
  --c-ink: #101315;
  --c-carbon: #17191C;
  --c-warm: #F5F2ED;
  --c-paper: #FAF8F5;
  --c-line-dark: rgba(255,255,255,.14);
  --c-line-light: #E4DED5;
  --c-txt-dark: rgba(255,255,255,.92);
  --c-txt-dark-soft: rgba(255,255,255,.64);
  --c-txt-light: #191C1F;
  --c-txt-light-soft: #5A5F64;
  --c-accent: #D29A46;
  --c-accent-hover: #E4AE5F;
  --c-succ: #3D8D71;
  --r-lg: 24px;
  --r-md: 16px;
  --r-pill: 999px;
  --shadow-soft: 0 8px 30px rgba(20,20,20,.06);
  --ease: cubic-bezier(.22,.61,.36,1);
  --container-width: 1200px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  color:var(--c-txt-light);
  background:var(--c-warm);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit;transition:color .25s var(--ease)}
button{font-family:inherit;background:none;border:none;cursor:pointer;color:inherit}
ul,ol{list-style:none}
input,textarea,summary{font-family:inherit;outline:none}
summary::-webkit-details-marker{display:none}
.grid-container{max-width:var(--container-width);padding-left:20px;padding-right:20px}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  border-radius:var(--r-pill);
  padding:14px 30px;
  font-size:15px;
  font-weight:700;
  line-height:1.2;
  border:1px solid transparent;
  transition:all .3s var(--ease);
  white-space:nowrap;
  text-align:center;
}
.btn-primary{background:var(--c-accent);color:#101315}
.btn-primary:hover{background:var(--c-accent-hover);transform:translateY(-2px);box-shadow:0 10px 24px rgba(210,154,70,.28)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-ghost-light{background:transparent;border-color:rgba(255,255,255,.35);color:rgba(255,255,255,.92)}
.btn-ghost-light:hover{border-color:rgba(255,255,255,.7);color:#fff;background:rgba(255,255,255,.06)}
.btn-ghost-dark{background:transparent;border-color:rgba(16,19,21,.22);color:var(--c-txt-light)}
.btn-ghost-dark:hover{border-color:var(--c-accent);color:var(--c-accent)}
.btn-sm{padding:9px 20px;font-size:14px}

.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:1000;
  padding:26px 0 0;
  transition:padding .3s var(--ease);
}
.nav-master{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:22px;
  width:100%;
  border-radius:var(--r-pill);
  border:1px solid rgba(255,255,255,.14);
  background:rgba(16,19,21,.36);
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
  padding:8px 8px 8px 20px;
  transition:background .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.site-header.is-scrolled{padding-top:16px}
.site-header.is-scrolled .nav-master{
  background:rgba(250,248,245,.82);
  border-color:rgba(255,255,255,.55);
  box-shadow:var(--shadow-soft);
}
.brand{display:inline-flex;align-items:center;gap:10px;min-width:200px}
.brand-mark{
  width:32px;
  height:32px;
  min-width:32px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  background:var(--c-accent);
  color:#101315;
  border-radius:10px;
  font-weight:900;
  font-size:18px;
  line-height:1;
}
.brand-text{
  font-size:17px;
  font-weight:800;
  letter-spacing:.03em;
  color:rgba(255,255,255,.94);
  transition:color .3s var(--ease);
}
.is-scrolled .brand-text{color:var(--c-txt-light)}
.main-nav{display:flex;align-items:center;gap:2px;justify-content:center}
.nav-link{
  display:inline-flex;
  align-items:center;
  padding:10px 16px;
  border-radius:var(--r-pill);
  border-bottom:2px solid transparent;
  font-size:15px;
  font-weight:500;
  color:rgba(255,255,255,.85);
  transition:color .25s var(--ease),border-color .25s var(--ease);
}
.nav-link:hover{color:var(--c-accent)}
.nav-link.is-active{color:var(--c-accent-hover);border-bottom-color:var(--c-accent)}
.is-scrolled .nav-link{color:var(--c-txt-light)}
.is-scrolled .nav-link:hover{color:var(--c-accent)}
.is-scrolled .nav-link.is-active{color:var(--c-accent)}
.header-actions{display:flex;align-items:center;gap:12px;justify-content:flex-end;min-width:130px}
.nav-burger{
  display:none;
  width:42px;
  height:42px;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.18);
  color:#fff;
  font-size:18px;
}
.is-scrolled .nav-burger{background:var(--c-warm);border-color:var(--c-line-light);color:var(--c-txt-light)}
.mobile-close-btn{display:none!important;width:42px;height:42px;align-items:center;justify-content:center;border-radius:50%;background:var(--c-warm);border:1px solid var(--c-line-light);color:var(--c-txt-light);font-size:18px;position:absolute;top:14px;right:14px}

.page-hero{
  position:relative;
  background:var(--c-ink);
  background-size:cover;
  background-position:center;
  background-repeat:no-repeat;
  padding:190px 0 90px;
  color:var(--c-txt-dark);
  isolation:isolate;
}
.page-hero::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(110deg,rgba(16,19,21,.92) 10%,rgba(16,19,21,.72) 55%,rgba(16,19,21,.58));
  z-index:-1;
}
.hero-breadcrumb{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:14px;
  color:rgba(255,255,255,.56);
  margin-bottom:28px;
}
.hero-breadcrumb .is-current{color:rgba(255,255,255,.84)}
.hero-breadcrumb i{font-size:13px}
.hero-topline{
  display:inline-flex;
  align-items:center;
  gap:8px;
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.15);
  border-radius:var(--r-pill);
  padding:6px 16px;
  font-size:13px;
  color:rgba(255,255,255,.75);
  margin-bottom:22px;
}
.hero-topline .dot{width:6px;height:6px;border-radius:50%;background:var(--c-accent)}
.page-hero h1{
  max-width:820px;
  font-size:clamp(44px,7vw,84px);
  font-weight:900;
  line-height:1.08;
  letter-spacing:.01em;
  color:#fff;
}
.hero-sub{
  margin-top:24px;
  max-width:720px;
  font-size:clamp(16px,2vw,20px);
  line-height:1.8;
  color:rgba(255,255,255,.75);
}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-top:34px}
.hero-meta{
  display:flex;
  flex-wrap:wrap;
  gap:8px 22px;
  margin-top:42px;
  padding-top:24px;
  border-top:1px solid rgba(255,255,255,.14);
  color:rgba(255,255,255,.55);
  font-size:13px;
  letter-spacing:.02em;
}

.category-main{background:var(--c-warm);padding:clamp(64px,9vw,110px) 0 80px}
.toc-col{position:relative}
.toc-wrap{
  position:sticky;
  top:130px;
  border:1px solid var(--c-line-light);
  border-radius:var(--r-lg);
  background:var(--c-paper);
  padding:30px 26px;
  box-shadow:var(--shadow-soft);
  transition:top .3s var(--ease);
}
.site-header.is-scrolled ~ main .toc-wrap{top:96px}
.toc-caption{
  font-size:13px;
  color:var(--c-txt-light-soft);
  letter-spacing:.2em;
  text-transform:uppercase;
  margin-bottom:22px;
  padding-bottom:16px;
  border-bottom:1px solid var(--c-line-light);
}
.toc-list{display:flex;flex-direction:column;gap:4px}
.toc-list a{
  display:flex;
  align-items:center;
  gap:12px;
  padding:10px 10px;
  border-radius:12px;
  font-size:15px;
  font-weight:500;
  color:var(--c-txt-light-soft);
  border-left:2px solid transparent;
  transition:all .25s var(--ease);
}
.toc-list a .toc-no{font-size:12px;color:var(--c-accent);font-weight:700}
.toc-list a:hover{background:rgba(210,154,70,.08);color:var(--c-txt-light);border-left-color:var(--c-accent)}
.toc-download{
  margin-top:24px;
  padding-top:22px;
  border-top:1px solid var(--c-line-light);
  display:flex;
  align-items:center;
  gap:12px;
  font-size:13px;
  color:var(--c-txt-light-soft);
}

.content-col{display:flex;flex-direction:column;gap:28px}
.panel-card{
  background:var(--c-paper);
  border:1px solid var(--c-line-light);
  border-radius:var(--r-lg);
  padding:clamp(26px,4vw,46px);
  box-shadow:var(--shadow-soft);
}
.panel-head{
  display:flex;
  align-items:center;
  gap:16px;
  margin-bottom:26px;
}
.panel-no{
  font-size:14px;
  font-weight:700;
  color:var(--c-accent);
  letter-spacing:.14em;
  border:1px solid rgba(210,154,70,.45);
  border-radius:var(--r-pill);
  padding:4px 14px;
  background:rgba(210,154,70,.06);
}
.panel-head h2{font-size:clamp(24px,3vw,32px);font-weight:800;line-height:1.2}
.panel-desc{font-size:16px;line-height:1.85;color:var(--c-txt-light-soft)}

.download-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:44px;align-items:center;margin-top:30px}
.download-media img{border-radius:20px;border:1px solid var(--c-line-light);width:100%;object-fit:cover;aspect-ratio:4/3}
.download-meta-list{display:flex;flex-direction:column;gap:14px;margin:26px 0 30px}
.download-meta-item{
  display:flex;
  justify-content:space-between;
  gap:20px;
  flex-wrap:wrap;
  padding:14px 2px;
  border-bottom:1px solid var(--c-line-light);
  font-size:15px;
}
.download-meta-item .label{color:var(--c-txt-light-soft)}
.download-meta-item .value{font-weight:600}
.platform-tag{
  display:inline-flex;
  align-items:center;
  gap:8px;
  background:rgba(61,141,113,.09);
  border:1px solid rgba(61,141,113,.25);
  color:#2C7160;
  font-size:13px;
  font-weight:600;
  border-radius:var(--r-pill);
  padding:5px 13px;
  margin-right:8px;
}
.download-actions{display:flex;flex-wrap:wrap;gap:12px}
.verify-line{display:flex;align-items:center;gap:8px;margin-top:20px;font-size:14px;color:var(--c-txt-light-soft)}
.verify-line i{color:var(--c-succ)}

.version-highlight{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:16px;
  margin:30px 0 10px;
}
.version-num{
  border:1px solid var(--c-line-light);
  border-radius:18px;
  background:var(--c-warm);
  padding:26px 24px;
}
.version-num em{font-style:normal;font-size:34px;font-weight:900;color:var(--c-txt-light)}
.version-num span{display:block;margin-top:8px;font-size:14px;color:var(--c-txt-light-soft)}
.feature-check{display:flex;flex-direction:column;gap:0;margin-top:34px}
.feature-check li{
  display:flex;
  gap:16px;
  padding:18px 4px;
  border-bottom:1px solid var(--c-line-light);
  font-size:15px;
  line-height:1.75;
}
.feature-check li i{color:var(--c-accent);font-size:19px;margin-top:3px}
.feature-check .feature-title{display:block;font-weight:700;margin-bottom:2px}

.step-list{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:22px}
.step-item{
  position:relative;
  background:var(--c-warm);
  border:1px solid var(--c-line-light);
  border-radius:20px;
  padding:24px 22px;
}
.step-num{font-size:28px;font-weight:900;color:var(--c-accent);line-height:1}
.step-item h3{font-size:17px;font-weight:700;margin:16px 0 8px}
.step-item p{font-size:14px;color:var(--c-txt-light-soft);line-height:1.7}
.install-note{
  margin-top:20px;
  border-left:1px solid var(--c-accent);
  padding:16px 20px;
  background:rgba(210,154,70,.04);
  border-radius:0 14px 14px 0;
  font-size:14px;
  color:var(--c-txt-light-soft);
  line-height:1.8;
}

.spec-list{display:flex;flex-direction:column;margin-top:10px}
.spec-item{
  display:grid;
  grid-template-columns:220px 1fr;
  gap:30px;
  padding:18px 0;
  border-bottom:1px solid var(--c-line-light);
  font-size:15px;
}
.spec-label{color:var(--c-txt-light-soft);font-weight:500}
.spec-value{font-weight:600}
.spec-foot{font-size:13px;color:var(--c-txt-light-soft);margin-top:16px}

.release-list{display:flex;flex-direction:column;margin-top:16px}
.release-item{
  display:grid;
  grid-template-columns:120px 150px 1fr;
  gap:24px;
  padding:22px 0;
  border-bottom:1px solid var(--c-line-light);
}
.release-item:last-child{border-bottom:none}
.release-version{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:fit-content;
  height:34px;
  padding:0 14px;
  background:rgba(210,154,70,.1);
  border:1px solid rgba(210,154,70,.35);
  color:#8d6424;
  font-weight:700;
  font-size:14px;
  border-radius:var(--r-pill);
}
.release-meta{font-size:14px;color:var(--c-txt-light-soft);line-height:34px}
.release-item p{font-size:15px;color:var(--c-txt-light);line-height:1.8}

.faq-panel .panel-head{margin-bottom:18px}
.faq-wrap{display:flex;flex-direction:column}
.faq-item{
  border-bottom:1px solid var(--c-line-light);
  transition:background .25s var(--ease);
}
.faq-item:hover{background:rgba(210,154,70,.05)}
.faq-item summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  min-height:66px;
  cursor:pointer;
  padding:0 18px;
  font-size:16px;
  font-weight:600;
  list-style:none;
  transition:color .25s var(--ease);
}
.faq-item summary:hover{color:var(--c-accent)}
.faq-answer{padding:4px 18px 24px;font-size:15px;color:var(--c-txt-light-soft);line-height:1.85}

.security-band{
  position:relative;
  background:var(--c-ink);
  color:var(--c-txt-dark);
  padding:clamp(64px,8vw,100px) 0;
  isolation:isolate;
  overflow:hidden;
}
.security-band::before{
  content:"";
  position:absolute;
  inset:0;
  background:url('/assets/images/backpic/back-3.png') center/cover no-repeat;
  opacity:.14;
  z-index:-1;
}
.security-band .sec-kicker{
  color:var(--c-accent);
  font-weight:700;
  letter-spacing:.14em;
  font-size:14px;
  margin-bottom:14px;
}
.security-band h2{
  color:#fff;
  font-size:clamp(30px,4vw,44px);
  font-weight:800;
  max-width:760px;
  line-height:1.3;
}
.sec-intro{max-width:720px;color:var(--c-txt-dark-soft);margin-top:18px;font-size:16px;line-height:1.8}
.check-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:44px}
.check-card{
  border:1px solid var(--c-line-dark);
  border-radius:20px;
  background:rgba(255,255,255,.03);
  padding:28px 26px;
  transition:border-color .3s var(--ease),transform .3s var(--ease);
}
.check-card:hover{border-color:rgba(210,154,70,.55);transform:translateY(-4px)}
.check-card i{color:var(--c-accent);font-size:24px}
.check-card h3{color:#fff;font-size:18px;font-weight:700;margin:18px 0 10px}
.check-card p{font-size:14px;color:var(--c-txt-dark-soft);line-height:1.8}

.bottom-cta{
  position:relative;
  padding:clamp(70px,9vw,110px) 0;
  background:var(--c-ink);
  color:#fff;
  text-align:center;
  isolation:isolate;
}
.bottom-cta::before{
  content:"";
  position:absolute;
  inset:0;
  background:url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  opacity:.17;
  z-index:-1;
}
.cta-inner{display:flex;flex-direction:column;align-items:center}
.cta-pill{
  display:inline-flex;
  background:rgba(210,154,70,.13);
  border:1px solid rgba(210,154,70,.4);
  color:#E4AE5F;
  font-size:13px;
  padding:6px 18px;
  border-radius:var(--r-pill);
  margin-bottom:24px;
}
.bottom-cta h2{
  font-size:clamp(32px,5vw,56px);
  font-weight:900;
  color:#fff;
  line-height:1.2;
  letter-spacing:.01em;
  max-width:800px;
}
.cta-sub{max-width:600px;color:var(--c-txt-dark-soft);margin:20px auto 0;font-size:15px;line-height:1.85}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-top:36px}
.cta-footnote{color:rgba(255,255,255,.42);font-size:13px;margin-top:24px}

.footer{
  background:#0C0E10;
  color:var(--c-txt-dark);
  padding-top:72px;
}
.footer-panel{padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer-brand{
  font-size:22px;
  font-weight:800;
  margin-bottom:14px;
  color:#fff;
  letter-spacing:.02em;
}
.footer-desc{font-size:14px;line-height:1.9;color:rgba(255,255,255,.48);max-width:420px}
.footer-head{
  font-size:14px;
  color:#fff;
  font-weight:700;
  margin-bottom:20px;
  letter-spacing:.03em;
}
.footer-links{display:flex;flex-direction:column;gap:12px}
.footer-links a{font-size:14px;color:rgba(255,255,255,.52);transition:color .25s var(--ease)}
.footer-links a:hover{color:var(--c-accent)}
.footer-extra{
  display:flex;
  flex-wrap:wrap;
  gap:8px 30px;
  padding:26px 0 30px;
  font-size:13px;
  color:rgba(255,255,255,.35);
  align-items:center;
}
.footer-extra span{white-space:nowrap}

@media (max-width:1024px){
  .download-grid{grid-template-columns:1fr;gap:30px}
  .step-list{grid-template-columns:1fr 1fr}
  .version-highlight{grid-template-columns:1fr 1fr}
  .check-grid{grid-template-columns:1fr 1fr}
  .release-item{grid-template-columns:100px 1fr;row-gap:8px}
  .release-item p{grid-column:1 / -1;padding-top:6px}
}
@media (max-width:900px){
  .main-nav{
    position:fixed;
    top:16px;
    right:16px;
    left:16px;
    width:calc(100% - 32px);
    background:var(--c-paper);
    border-radius:24px;
    box-shadow:0 18px 46px rgba(0,0,0,.24);
    flex-direction:column;
    align-items:stretch;
    gap:8px;
    padding:24px 20px 28px;
    opacity:0;
    visibility:hidden;
    transform:translateY(-12px);
    transition:all .3s var(--ease);
    max-height:calc(100vh - 40px);
    overflow-y:auto;
  }
  body.nav-open .main-nav{opacity:1;visibility:visible;transform:translateY(0)}
  .nav-link{border:1px solid transparent;border-radius:12px;font-size:16px;padding:14px 16px;color:var(--c-txt-light)}
  .nav-link.is-active{border-color:rgba(210,154,70,.45);background:rgba(210,154,70,.08);color:var(--c-accent)}
  .is-scrolled .nav-link,.nav-link{color:var(--c-txt-light)}
  .nav-burger{display:inline-flex}
  .mobile-close-btn{display:inline-flex!important}
  .header-actions{min-width:auto}
  .site-header.is-scrolled .main-nav,.site-header .main-nav{box-shadow:none}
  .spec-item{grid-template-columns:1fr;gap:6px;padding:16px 0}
  .toc-wrap{position:static;top:auto}
}
@media (max-width:767px){
  .page-hero{padding:150px 0 64px}
  .nav-master{padding-left:14px}
  .brand-text{font-size:15px;letter-spacing:0}
  .hero-actions .btn{flex:1;justify-content:center}
  .version-highlight{grid-template-columns:1fr}
  .check-grid{grid-template-columns:1fr}
  .footer-panel{padding-bottom:30px}
  .footer-head{margin-top:24px}
}
@media (max-width:520px){
  .step-list{grid-template-columns:1fr}
  .hero-topline{display:none}
  .brand-mark{width:28px;height:28px;min-width:28px;font-size:15px;border-radius:8px}
  .btn{width:100%}
  .header-actions .btn{width:auto}
  .page-hero h1{font-size:40px}
  .download-meta-item{flex-direction:column;gap:4px}
  .release-item{grid-template-columns:1fr;gap:10px}
  .cta-actions .btn{width:auto;min-width:150px}
}

/* roulang page: category3 */
:root {
            --c-ink: #101315;
            --c-carbon: #17191C;
            --c-warm: #F5F2ED;
            --c-paper: #FAF8F5;
            --c-line-dark: rgba(255, 255, 255, .14);
            --c-line-light: #E4DED5;
            --c-txt-dark: rgba(255, 255, 255, .92);
            --c-txt-dark-soft: rgba(255, 255, 255, .64);
            --c-txt-light: #191C1F;
            --c-txt-light-soft: #5A5F64;
            --c-accent: #D29A46;
            --c-accent-hover: #E4AE5F;
            --c-succ: #3D8D71;
            --shadow-card: 0 8px 30px rgba(20, 20, 20, .06);
            --radius-lg: 24px;
            --radius-md: 16px;
            --radius-btn: 999px;
            --space-section: clamp(64px, 9vw, 128px);
            --ease: cubic-bezier(.22, .61, .36, 1);
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 112px;
        }

        body {
            margin: 0;
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, "Noto Sans CJK SC", sans-serif;
            background: var(--c-warm);
            color: var(--c-txt-light);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeLegibility;
        }

        body.nav-open {
            overflow: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color .22s var(--ease), background .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease), transform .22s var(--ease);
        }

        img {
            max-width: 100%;
            height: auto;
            display: inline-block;
            vertical-align: middle;
        }

        p {
            margin: 0 0 1rem;
        }

        ul,
        ol {
            margin: 0 0 1rem;
            padding-left: 1.2rem;
        }

        input,
        button,
        textarea {
            font-family: inherit;
            font-size: inherit;
            color: inherit;
        }

        button {
            border: 0;
            cursor: pointer;
            background: none;
        }

        .skip-link {
            position: fixed;
            top: -60px;
            left: 16px;
            z-index: 2000;
            background: var(--c-warm);
            color: var(--c-txt-light);
            padding: 10px 18px;
            border-radius: 999px;
            font-weight: 700;
            transition: top .22s ease;
        }

        .skip-link:focus {
            top: 16px;
            outline: 3px solid rgba(210, 154, 70, .35);
        }

        .grid-container {
            max-width: 1200px;
            padding-left: 20px;
            padding-right: 20px;
        }

        .section {
            padding-top: var(--space-section);
            padding-bottom: var(--space-section);
        }

        .section-tight {
            padding-top: 0;
        }

        ::selection {
            background: rgba(210, 154, 70, .3);
        }

        :focus-visible {
            outline: 3px solid rgba(210, 154, 70, .45);
            outline-offset: 2px;
            border-radius: 6px;
        }

        /* ============ Header ============ */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            padding-top: 16px;
            z-index: 1200;
            pointer-events: none;
            transition: top .25s var(--ease);
        }

        .site-header .grid-container {
            pointer-events: auto;
        }

        .site-header.is-scrolled {
            top: 6px;
        }

        .nav-master {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 18px;
            padding: 8px 8px 8px 18px;
            border: 1px solid transparent;
            border-radius: 999px;
            background: rgba(16, 19, 21, .18);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            transition: background .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease), padding .25s var(--ease);
        }

        .site-header.is-scrolled .nav-master {
            background: rgba(250, 248, 245, .74);
            border-color: rgba(255, 255, 255, .7);
            box-shadow: 0 12px 30px rgba(16, 19, 21, .1);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
        }

        .brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            min-width: 0;
            padding: 5px 0;
            font-size: 20px;
            font-weight: 800;
            letter-spacing: .02em;
            white-space: nowrap;
            color: var(--c-txt-dark);
            transition: color .25s var(--ease);
        }

        .site-header.is-scrolled .brand-text {
            color: var(--c-txt-light);
        }

        .brand-text {
            color: var(--c-txt-dark);
            font-size: 19px;
            transition: color .25s var(--ease);
        }

        .brand-mark {
            width: 32px;
            height: 32px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: var(--c-accent);
            color: #101315;
            font-size: 18px;
            font-weight: 900;
            flex: 0 0 auto;
            line-height: 1;
            box-shadow: 0 0 0 1px rgba(255, 255, 255, .1);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            padding: 10px 14px;
            font-size: 15px;
            font-weight: 500;
            color: rgba(255, 255, 255, .88);
            border-radius: 999px;
            position: relative;
            transition: color .22s var(--ease), background .22s var(--ease);
        }

        .site-header.is-scrolled .nav-link {
            color: var(--c-txt-light);
        }

        .nav-link:hover,
        .nav-link:focus-visible {
            color: var(--c-accent);
        }

        .nav-link.is-active {
            color: var(--c-accent);
            font-weight: 700;
        }

        .nav-link.is-active::after {
            content: "";
            position: absolute;
            left: 16px;
            right: 16px;
            bottom: 4px;
            height: 2px;
            border-radius: 2px;
            background: var(--c-accent);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex: 0 0 auto;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 9px;
            padding: 14px 28px;
            border: 1px solid transparent;
            border-radius: 999px;
            font-size: 16px;
            font-weight: 700;
            line-height: 1;
            white-space: nowrap;
            transition: all .22s var(--ease);
            cursor: pointer;
            text-decoration: none;
        }

        .btn i {
            font-size: .92em;
        }

        .btn-primary {
            background: var(--c-accent);
            color: #101315;
            box-shadow: 0 8px 20px rgba(210, 154, 70, .18);
        }

        .btn-primary:hover,
        .btn-primary:focus-visible {
            background: var(--c-accent-hover);
            color: #101315;
            transform: translateY(-2px);
            box-shadow: 0 12px 26px rgba(210, 154, 70, .3);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-ghost {
            background: rgba(250, 248, 245, .04);
            border: 1px solid rgba(255, 255, 255, .38);
            color: var(--c-txt-dark);
        }

        .btn-ghost:hover,
        .btn-ghost:focus-visible {
            border-color: rgba(255, 255, 255, .8);
            background: rgba(255, 255, 255, .1);
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-ghost-dark {
            background: transparent;
            border-color: rgba(25, 28, 31, .28);
            color: var(--c-txt-light);
        }

        .btn-ghost-dark:hover,
        .btn-ghost-dark:focus-visible {
            background: rgba(210, 154, 70, .1);
            border-color: var(--c-accent);
            color: var(--c-txt-light);
        }

        .btn-sm {
            padding: 10px 22px;
            font-size: 14px;
        }

        .btn-lg {
            padding: 18px 38px;
            font-size: 18px;
        }

        .nav-burger,
        .mobile-close-btn {
            display: none;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, .09);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, .24);
            font-size: 18px;
            line-height: 1;
            transition: all .2s ease;
        }

        .site-header.is-scrolled .nav-burger {
            background: var(--c-paper);
            border-color: var(--c-line-light);
            color: var(--c-txt-light);
        }

        .nav-burger:hover {
            color: var(--c-accent);
        }

        /* Hero */
        .cat-hero {
            background:
                linear-gradient(180deg, rgba(16, 19, 21, .86) 0%, rgba(16, 19, 21, .76) 72%, rgba(245, 242, 237, .98) 100%),
                url("/assets/images/backpic/back-1.webp") center 40% / cover no-repeat;
            color: var(--c-txt-dark);
            padding-top: clamp(154px, 18vw, 216px);
            padding-bottom: clamp(60px, 9vw, 110px);
            position: relative;
            overflow: hidden;
        }

        .cat-hero-inner {
            position: relative;
            z-index: 2;
            max-width: 980px;
            text-align: center;
        }

        .cat-hero-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 16px;
            border-radius: 999px;
            border: 1px solid rgba(255, 255, 255, .25);
            background: rgba(255, 255, 255, .06);
            color: rgba(255, 255, 255, .78);
            font-size: 14px;
            letter-spacing: .14em;
            margin-bottom: 24px;
        }

        .cat-hero h1 {
            font-size: clamp(38px, 6vw, 68px);
            line-height: 1.12;
            letter-spacing: .01em;
            font-weight: 900;
            margin: 0 0 22px;
            color: #fff;
        }

        .cat-hero h1 em {
            font-style: normal;
            color: var(--c-accent);
        }

        .cat-hero .lead-text {
            max-width: 760px;
            margin: 0 auto;
            font-size: clamp(16px, 2vw, 20px);
            line-height: 1.9;
            color: rgba(255, 255, 255, .76);
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
            gap: 16px;
            margin: 34px 0 16px;
        }

        .hero-actions .btn {
            min-width: 150px;
        }

        .hero-note {
            font-size: 14px;
            color: rgba(255, 255, 255, .52);
            letter-spacing: .02em;
        }

        .hero-note i {
            color: var(--c-accent);
            margin-right: 6px;
        }

        .hero-badges {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            margin-top: 34px;
        }

        .pill {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 7px 16px;
            border-radius: 999px;
            border: 1px solid var(--c-line-light);
            background: var(--c-paper);
            font-size: 14px;
            font-weight: 600;
            line-height: 1;
            color: var(--c-txt-light);
            white-space: nowrap;
        }

        .pill-dark {
            background: rgba(255, 255, 255, .08);
            border-color: rgba(255, 255, 255, .2);
            color: rgba(255, 255, 255, .88);
        }

        .pill-warm {
            background: rgba(210, 154, 70, .12);
            border-color: rgba(210, 154, 70, .34);
            color: var(--c-accent);
        }

        .hero-stat-strip {
            background: var(--c-warm);
            border-top: 1px solid var(--c-line-light);
        }

        .hero-stat-row {
            padding: 0;
            list-style: none;
            margin: 0;
            border-bottom: 1px solid var(--c-line-light);
        }

        .hero-stat-row .stat-cell {
            padding: 36px 28px 38px;
            border-right: 1px solid var(--c-line-light);
        }

        .hero-stat-row .stat-cell:last-child {
            border-right: 0;
        }

        .stat-cell i {
            color: var(--c-accent);
            font-size: 26px;
            margin-bottom: 18px;
        }

        .stat-cell .stat-title {
            font-size: 17px;
            font-weight: 800;
            color: var(--c-txt-light);
            margin-bottom: 6px;
            line-height: 1.5;
        }

        .stat-cell p {
            margin: 0;
            color: var(--c-txt-light-soft);
            font-size: 14px;
            line-height: 1.7;
        }

        /* Section heading */
        .section-head {
            max-width: 880px;
            margin-bottom: clamp(36px, 5vw, 56px);
        }

        .section-head.center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .eyebrow {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            font-weight: 800;
            letter-spacing: .16em;
            color: var(--c-accent);
            text-transform: uppercase;
            margin-bottom: 14px;
        }

        .center .eyebrow {
            justify-content: center;
        }

        .section-title {
            font-size: clamp(30px, 4.6vw, 52px);
            line-height: 1.2;
            font-weight: 800;
            margin: 0 0 16px;
            letter-spacing: .01em;
        }

        .section-desc {
            font-size: clamp(16px, 1.8vw, 20px);
            line-height: 1.85;
            color: var(--c-txt-light-soft);
            margin: 0;
        }

        /* Feature block */
        .feature-block {
            background: var(--c-warm);
            padding-bottom: 24px;
        }

        .feature-grid {
            background: var(--c-paper);
            border-radius: var(--radius-lg);
            border: 1px solid var(--c-line-light);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }

        .feature-body {
            padding: clamp(32px, 5vw, 64px);
            display: flex;
            flex-wrap: wrap;
            align-content: center;
        }

        .feature-body .section-title {
            margin-bottom: 18px;
        }

        .feature-list {
            list-style: none;
            padding: 0;
            margin: 24px 0 30px;
        }

        .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px solid rgba(228, 222, 213, .55);
            color: var(--c-txt-light);
        }

        .feature-list li:last-child {
            border-bottom: 0;
        }

        .feature-list i {
            color: var(--c-accent);
            margin-top: 6px;
            width: 18px;
            text-align: center;
            flex: 0 0 auto;
        }

        .feature-list strong {
            display: block;
            font-weight: 700;
            margin-bottom: 3px;
        }

        .feature-list span {
            color: var(--c-txt-light-soft);
            font-size: 15px;
        }

        .feature-media {
            height: 100%;
            background: var(--c-carbon);
            min-height: 300px;
        }

        .feature-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 100%;
            display: block;
        }

        /* Alternating media rows */
        .topic-flow {
            background: var(--c-warm);
            padding-top: clamp(48px, 7vw, 88px);
        }

        .topic-list {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: clamp(28px, 4vw, 52px);
        }

        .topic-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: clamp(24px, 4.5vw, 64px);
            align-items: center;
            background: var(--c-paper);
            border: 1px solid var(--c-line-light);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }

        .topic-row+.topic-row {
            margin-top: 0;
        }

        .topic-media {
            height: 100%;
            min-height: 260px;
            overflow: hidden;
            position: relative;
        }

        .topic-media img {
            width: 100%;
            height: 100%;
            display: block;
            object-fit: cover;
            min-height: 260px;
            transition: transform .5s var(--ease);
        }

        .topic-row:nth-child(even) .topic-media {
            order: 2;
        }

        .topic-body {
            padding: clamp(28px, 4vw, 52px);
        }

        .topic-body .number-tag {
            font-size: 14px;
            font-weight: 800;
            letter-spacing: .1em;
            color: var(--c-accent);
        }

        .topic-title {
            font-size: clamp(23px, 3vw, 34px);
            font-weight: 800;
            line-height: 1.3;
            margin: 12px 0 14px;
        }

        .topic-body p {
            color: var(--c-txt-light-soft);
            font-size: 16px;
            line-height: 1.9;
            margin-bottom: 20px;
        }

        .topic-link {
            color: var(--c-txt-light);
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            border-bottom: 2px solid transparent;
        }

        .topic-link i {
            color: var(--c-accent);
            transition: transform .2s var(--ease);
        }

        .topic-link:hover {
            color: var(--c-accent);
            border-bottom-color: var(--c-accent);
        }

        .topic-link:hover i {
            transform: translateX(4px);
        }

        /* Timeline section */
        .timeline-section {
            padding-top: calc(var(--space-section) - 24px);
            padding-bottom: calc(var(--space-section) + 20px);
            color: var(--c-txt-dark);
        }

        .timeline-outer {
            display: grid;
            grid-template-columns: .82fr 1.35fr;
            gap: clamp(40px, 6vw, 90px);
        }

        .timeline-intro {
            color: rgba(255, 255, 255, .62);
        }

        .timeline-intro h2 {
            color: var(--c-txt-dark);
        }

        .timeline-intro .section-title {
            margin-bottom: 20px;
        }

        .timeline-intro .section-desc {
            color: rgba(255, 255, 255, .62);
        }

        .timeline-list {
            list-style: none;
            padding: 0;
            margin: 0;
            position: relative;
            border-left: 1px solid var(--c-line-dark);
        }

        .timeline-item {
            position: relative;
            padding: 0 0 40px 32px;
        }

        .timeline-item:last-child {
            padding-bottom: 0;
        }

        .timeline-item::before {
            content: "";
            position: absolute;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            left: -8px;
            top: 4px;
            background: var(--c-accent);
            border: 4px solid rgba(210, 154, 70, .18);
        }

        .timeline-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
            margin-bottom: 12px;
        }

        .timeline-date {
            font-size: 14px;
            color: rgba(255, 255, 255, .62);
            letter-spacing: .06em;
            font-feature-settings: "tnum";
        }

        .timeline-content h3 {
            color: var(--c-txt-dark);
            font-size: 19px;
            font-weight: 700;
            margin: 0 0 8px;
            line-height: 1.5;
        }

        .timeline-content p {
            font-size: 16px;
            color: rgba(255, 255, 255, .58);
            margin: 0;
        }

        /* FAQ */
        .faq-section {
            background: var(--c-warm);
        }

        .faq-wrap {
            max-width: 760px;
            margin: 0 auto;
            background: var(--c-paper);
            border: 1px solid var(--c-line-light);
            border-radius: var(--radius-lg);
            padding: clamp(20px, 3vw, 44px);
            box-shadow: var(--shadow-card);
        }

        .faq-item {
            border-bottom: 1px solid var(--c-line-light);
        }

        .faq-item:last-child {
            border-bottom: 0;
        }

        .faq-q {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 18px;
            padding: 20px 0;
            background: none;
            text-align: left;
            font-size: 17px;
            font-weight: 700;
            color: var(--c-txt-light);
            line-height: 1.6;
            border-radius: 0;
            transition: padding .2s var(--ease), color .2s var(--ease);
        }

        .faq-q:hover {
            color: var(--c-accent);
        }

        .faq-q .icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: rgba(210, 154, 70, .1);
            color: var(--c-accent);
            flex: 0 0 auto;
            transition: transform .3s var(--ease);
        }

        .faq-item.open .faq-q .icon {
            transform: rotate(180deg);
        }

        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height .3s var(--ease);
            color: var(--c-txt-light-soft);
        }

        .faq-a p {
            margin: 0;
            padding: 0 0 22px;
            font-size: 16px;
            line-height: 1.9;
        }

        /* CTA download */
        .download-cta {
            background:
                linear-gradient(105deg, rgba(16, 19, 21, .97) 0%, rgba(23, 25, 28, .94) 60%, rgba(31, 34, 38, .82) 100%),
                url("/assets/images/backpic/back-2.png") center / cover no-repeat;
            color: var(--c-txt-dark);
        }

        .download-panel {
            display: grid;
            grid-template-columns: .9fr 1.1fr;
            gap: clamp(42px, 7vw, 100px);
            align-items: center;
        }

        .download-copy h2 {
            color: #fff;
        }

        .download-copy p {
            color: rgba(255, 255, 255, .65);
            font-size: 17px;
            line-height: 1.9;
            margin: 18px 0 0;
        }

        .download-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-top: 28px;
        }

        .download-footnote {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            color: rgba(255, 255, 255, .58);
            background: rgba(255, 255, 255, .04);
            border: 1px solid rgba(255, 255, 255, .13);
            border-radius: 24px;
            padding: 42px 28px;
        }

        .download-footnote i {
            color: var(--c-accent);
            font-size: 28px;
            margin-bottom: 16px;
        }

        .download-footnote h3 {
            color: #fff;
            font-size: 21px;
            margin-bottom: 10px;
        }

        .download-footnote p {
            font-size: 14px;
            margin: 0;
            line-height: 1.8;
        }

        .version-meta {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px 22px;
            margin-top: 32px;
            font-size: 14px;
            font-feature-settings: "tnum";
            color: rgba(255, 255, 255, .48);
        }

        /* Footer */
        .footer {
            background: var(--c-ink);
            color: rgba(255, 255, 255, .68);
            padding: 72px 0 30px;
        }

        .footer-panel {
            row-gap: 44px;
        }

        .footer-brand {
            font-size: 24px;
            font-weight: 900;
            color: #fff;
            letter-spacing: .02em;
            margin-bottom: 14px;
        }

        .footer-desc {
            color: rgba(255, 255, 255, .55);
            font-size: 15px;
            line-height: 1.9;
            max-width: 380px;
        }

        .footer-head {
            font-size: 15px;
            letter-spacing: .12em;
            font-weight: 700;
            color: rgba(255, 255, 255, .52);
            text-transform: uppercase;
            margin: 0 0 16px;
        }

        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, .8);
            font-size: 15px;
            transition: color .22s ease, padding-left .22s ease;
        }

        .footer-links a:hover {
            color: var(--c-accent);
            padding-left: 4px;
        }

        .footer-extra {
            border-top: 1px solid rgba(255, 255, 255, .12);
            margin-top: 60px;
            padding-top: 22px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 14px 24px;
            color: rgba(255, 255, 255, .42);
            font-size: 13px;
        }

        /* Back top */
        .back-top {
            position: fixed;
            right: 26px;
            bottom: 26px;
            z-index: 900;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 20px;
            border-radius: 999px;
            background: rgba(16, 19, 21, .82);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, .18);
            font-size: 14px;
            font-weight: 600;
            line-height: 1;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            opacity: 0;
            visibility: hidden;
            transform: translateY(12px);
            transition: all .25s var(--ease);
            pointer-events: none;
        }

        .back-top.is-shown {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
            pointer-events: auto;
        }

        .back-top i {
            color: var(--c-accent);
        }

        .back-top:hover {
            color: #fff;
            background: var(--c-carbon);
            border-color: rgba(210, 154, 70, .54);
            transform: translateY(-2px);
        }

        /* Media queries */
        @media (max-width: 1023px) {
            .main-nav {
                display: flex;
                flex-direction: column;
                align-items: center;
                justify-content: center;
                position: fixed;
                top: 0;
                right: -94vw;
                width: 92vw;
                height: 100vh;
                background: rgba(250, 248, 245, .97);
                backdrop-filter: blur(18px);
                -webkit-backdrop-filter: blur(18px);
                border-left: 1px solid var(--c-line-light);
                padding: 50px 28px 28px;
                z-index: 1300;
                gap: 10px;
                visibility: hidden;
                transition: right .3s var(--ease), visibility .3s var(--ease);
            }

            .main-nav.nav-open {
                right: 0;
                visibility: visible;
            }

            .main-nav .nav-link {
                width: 100%;
                max-width: 240px;
                color: var(--c-txt-light);
                font-size: 18px;
                padding: 14px 12px;
                border-radius: 999px;
                justify-content: center;
            }

            .main-nav .nav-link.is-active {
                background: rgba(210, 154, 70, .12);
                color: var(--c-accent);
            }

            .nav-link.is-active::after {
                display: none;
            }

            .mobile-close-btn {
                display: flex;
                position: absolute;
                top: 18px;
                right: 20px;
                background: rgba(16, 19, 21, .08);
                color: var(--c-txt-light);
                border-color: transparent;
            }

            .nav-burger {
                display: inline-flex;
            }

            .site-header .btn-sm {
                display: none;
            }

            .hero-stat-row .stat-cell {
                padding: 30px 24px;
                border-right: 0;
                border-bottom: 1px solid var(--c-line-light);
            }

            .hero-stat-row .stat-cell:last-child {
                border-bottom: 0;
            }

            .topic-row {
                grid-template-columns: .94fr 1.06fr;
            }

            .timeline-outer {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 767px) {
            .site-header {
                padding-top: 10px;
            }

            .site-header.is-scrolled .nav-master,
            .nav-master {
                padding: 7px 7px 7px 14px;
                gap: 8px;
            }

            .brand-text {
                font-size: 17px;
            }

            .brand-mark {
                width: 28px;
                height: 28px;
                font-size: 16px;
            }

            .cat-hero {
                padding-top: 132px;
                padding-bottom: 48px;
                background-position: 55% center;
            }

            .cat-hero h1 {
                font-size: clamp(31px, 10vw, 48px);
                line-height: 1.16;
            }

            .cat-hero-eyebrow {
                font-size: 13px;
                padding: 6px 14px;
            }

            .hero-actions {
                gap: 12px;
                margin-top: 24px;
            }

            .btn {
                padding: 14px 22px;
            }

            .section {
                padding-top: 68px;
                padding-bottom: 68px;
            }

            .hero-stat-row .stat-cell {
                padding: 24px 18px;
                text-align: left;
                display: flex;
                align-items: flex-start;
                gap: 16px;
            }

            .stat-cell i {
                font-size: 20px;
                margin-bottom: 0;
                margin-top: 4px;
            }

            .feature-grid {
                display: block;
            }

            .feature-media,
            .topic-media {
                min-height: 220px;
            }

            .feature-body,
            .topic-body {
                padding: 26px 22px;
            }

            .topic-row {
                grid-template-columns: 1fr;
            }

            .topic-row:nth-child(even) .topic-media {
                order: 0;
            }

            .topic-media {
                height: auto;
            }

            .download-panel {
                grid-template-columns: 1fr;
            }

            .footer {
                padding-top: 52px;
            }

            .footer-extra {
                flex-direction: column;
                text-align: center;
            }

            .back-top {
                right: 16px;
                bottom: 16px;
            }
        }

        @media (max-width: 520px) {
            .brand-text {
                max-width: 172px;
                overflow: hidden;
                text-overflow: ellipsis;
            }

            .cat-hero .lead-text {
                font-size: 15px;
            }

            .hero-actions .btn {
                width: calc(100% - 20px);
                min-width: 0;
            }

            .topic-title {
                font-size: 24px;
            }

            .timeline-section {
                padding-top: 60px;
                padding-bottom: 70px;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            html {
                scroll-behavior: auto;
            }

            *,
            *::before,
            *::after {
                animation-duration: .01ms !important;
                transition-duration: .01ms !important;
            }
        }

/* roulang page: category2 */
:root {
            --ink: #101315;
            --carbon: #17191C;
            --paper: #FAF8F5;
            --warm: #F5F2ED;
            --line-dark: rgba(255, 255, 255, .14);
            --line-light: rgba(46, 38, 28, .14);
            --txt-dark: rgba(255, 255, 255, .92);
            --mut-dark: rgba(255, 255, 255, .66);
            --txt-light: #191C1F;
            --mut-light: #5A5F64;
            --accent: #C98543;
            --accent-hover: #DDA260;
            --accent-ink: #1B130A;
            --radius-lg: 24px;
            --radius-md: 16px;
            --radius-rd: 999px;
            --font-sans: "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            --shadow-card: 0 10px 36px rgba(17, 16, 14, .06);
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            -webkit-tap-highlight-color: transparent;
        }

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 100px;
        }

        body {
            margin: 0;
            background: var(--warm);
            color: var(--txt-light);
            font-family: var(--font-sans);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeLegibility;
        }

        img {
            max-width: 100%;
            display: block;
        }

        ul,
        ol,
        dl,
        dd,
        figure,
        blockquote,
        p {
            margin: 0;
        }

        ul,
        ol {
            list-style: none;
            padding: 0;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        button,
        summary {
            font: inherit;
            cursor: pointer;
            border: 0;
            background: none;
            color: inherit;
        }

        .grid-container {
            max-width: 1200px;
        }

        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            z-index: 80;
            width: 100%;
            padding: 14px 0 0;
            transition: all .3s cubic-bezier(.22, .61, .36, 1);
        }

        .site-header .grid-container {
            max-width: min(1200px, calc(100% - 24px));
            padding: 0;
        }

        .nav-master {
            height: 76px;
            padding: 0 10px 0 14px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: rgba(247, 243, 236, .84);
            border: 1px solid rgba(255, 255, 255, .68);
            border-radius: var(--radius-rd);
            box-shadow: 0 10px 36px rgba(16, 19, 21, .08);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            transition: box-shadow .3s ease, background .3s ease, transform .3s ease;
        }

        .site-header.is-scrolled .nav-master {
            box-shadow: 0 14px 46px rgba(16, 19, 21, .12);
        }

        .brand {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            flex: 0 0 auto;
        }

        .brand-mark {
            width: 40px;
            height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--ink);
            color: var(--accent);
            font-weight: 800;
            font-size: 20px;
            border-radius: 14px;
            line-height: 1;
            letter-spacing: -.02em;
        }

        .brand-text {
            font-weight: 700;
            font-size: 18px;
            letter-spacing: .01em;
            color: var(--txt-light);
            white-space: nowrap;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            margin: 0 auto;
            padding: 0 12px;
        }

        .nav-link {
            position: relative;
            display: inline-flex;
            align-items: center;
            height: 44px;
            padding: 0 18px;
            color: var(--txt-light);
            font-size: 15px;
            font-weight: 500;
            border-radius: var(--radius-rd);
            transition: color .2s ease, background .2s ease;
        }

        .nav-link::after {
            content: "";
            position: absolute;
            left: 18px;
            right: 18px;
            bottom: 2px;
            height: 2px;
            background: var(--accent);
            border-radius: 3px;
            transform: scaleX(0);
            transform-origin: center;
            transition: transform .3s ease;
        }

        .nav-link:hover {
            color: var(--accent);
            background: rgba(201, 133, 67, .08);
        }

        .nav-link:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        .nav-link.is-active {
            color: var(--accent);
            font-weight: 700;
        }

        .nav-link.is-active::after {
            transform: scaleX(1);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex: 0 0 auto;
        }

        .mobile-close-btn {
            display: none;
        }

        .nav-burger {
            width: 46px;
            height: 46px;
            display: none;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--txt-light);
            border-radius: var(--radius-rd);
            border: 1px solid var(--line-light);
            background: rgba(255, 255, 255, .7);
            transition: border .2s ease, color .2s ease;
        }

        .nav-burger:hover {
            color: var(--accent);
            border-color: rgba(201, 133, 67, .6);
        }

        .drawer-backdrop {
            position: fixed;
            inset: 0;
            z-index: 70;
            background: rgba(19, 18, 16, .5);
            opacity: 0;
            visibility: hidden;
            transition: opacity .3s ease, visibility .3s ease;
            backdrop-filter: blur(2px);
            -webkit-backdrop-filter: blur(2px);
        }

        .drawer-backdrop.is-open {
            opacity: 1;
            visibility: visible;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            border-radius: var(--radius-rd);
            font-weight: 700;
            font-size: 15px;
            line-height: 1;
            padding: 14px 28px;
            color: var(--txt-light);
            background: transparent;
            transition: all .24s cubic-bezier(.22, .61, .36, 1);
        }

        .btn i {
            font-size: 15px;
        }

        .btn-primary {
            background: var(--accent);
            color: #1E160D;
            box-shadow: 0 8px 24px rgba(201, 133, 67, .22);
        }

        .btn-primary:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(201, 133, 67, .32);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 6px 18px rgba(201, 133, 67, .2);
        }

        .btn-sm {
            padding: 9px 20px;
            font-size: 14px;
        }

        .btn-lg {
            padding: 16px 34px;
            font-size: 16px;
        }

        .btn-outline {
            border: 1px solid rgba(25, 28, 31, .28);
            color: var(--txt-light);
            background: transparent;
        }

        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: rgba(201, 133, 67, .05);
        }

        .btn-line-light {
            border: 1px solid var(--line-dark);
            color: var(--txt-dark);
        }

        .btn-line-light:hover {
            border-color: var(--accent);
            color: var(--accent-hover);
            background: rgba(255, 255, 255, .04);
        }

        .btn:focus-visible {
            outline: 3px solid rgba(201, 133, 67, .35);
            outline-offset: 3px;
        }

        .section {
            padding: clamp(72px, 9vw, 120px) 0;
        }

        .section-kicker {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--accent);
            font-size: 13px;
            font-weight: 700;
            letter-spacing: .12em;
        }

        .section-kicker::before {
            content: "";
            width: 22px;
            height: 1px;
            background: var(--accent);
        }

        .section-title {
            margin-top: 14px;
            font-size: clamp(28px, 4.4vw, 48px);
            font-weight: 800;
            line-height: 1.18;
            letter-spacing: -.02em;
            color: var(--txt-light);
        }

        .section-lead {
            max-width: 720px;
            margin-top: 16px;
            color: var(--mut-light);
            font-size: 16px;
            line-height: 1.9;
        }

        .section-head {
            margin-bottom: clamp(34px, 5vw, 60px);
        }

        .cat-hero {
            position: relative;
            background: var(--ink);
            color: var(--txt-dark);
            overflow: hidden;
            padding: clamp(132px, 16vw, 196px) 0 clamp(62px, 8vw, 104px);
        }

        .cat-hero::before {
            content: "";
            position: absolute;
            inset: 0;
            z-index: 0;
            pointer-events: none;
            background:
                radial-gradient(800px 360px at 82% 12%, rgba(201, 133, 67, .22), transparent 62%),
                radial-gradient(600px 420px at 10% 90%, rgba(255, 255, 255, .04), transparent 58%),
                linear-gradient(120deg, rgba(16, 19, 21, .86), rgba(23, 25, 28, .72)),
                url('/assets/images/backpic/back-1.webp') center/cover;
        }

        .cat-hero::after {
            content: "";
            position: absolute;
            right: -90px;
            bottom: -130px;
            width: 380px;
            height: 380px;
            border: 1px solid rgba(255, 255, 255, .06);
            border-radius: 50%;
            z-index: 0;
        }

        .cat-hero .grid-container {
            position: relative;
            z-index: 1;
        }

        .hero-kicker {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 7px 15px;
            border: 1px solid rgba(255, 255, 255, .18);
            border-radius: var(--radius-rd);
            color: var(--txt-dark);
            font-size: 13px;
            font-weight: 600;
            background: rgba(255, 255, 255, .04);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }

        .hero-kicker i {
            color: var(--accent-hover);
        }

        .cat-hero h1 {
            max-width: 720px;
            margin: 26px 0 22px;
            font-size: clamp(36px, 5.4vw, 72px);
            font-weight: 900;
            line-height: 1.08;
            letter-spacing: -.03em;
            color: #fff;
        }

        .cat-hero h1 span {
            display: block;
            color: var(--accent-hover);
        }

        .hero-deck {
            max-width: 620px;
            color: var(--mut-dark);
            font-size: clamp(15px, 2vw, 18px);
            line-height: 1.9;
        }

        .hero-actions {
            margin-top: 34px;
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }

        .hero-meta {
            margin-top: 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .hero-meta span {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 5px 13px;
            border-radius: var(--radius-rd);
            font-size: 13px;
            color: rgba(255, 255, 255, .76);
            border: 1px solid rgba(255, 255, 255, .12);
        }

        .hero-meta i {
            color: var(--accent-hover);
        }

        .hero-visual {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            transform: rotate(1.4deg);
            border: 1px solid rgba(255, 255, 255, .12);
            box-shadow: 0 28px 70px rgba(0, 0, 0, .3);
        }

        .hero-visual img {
            aspect-ratio: 4 / 3.2;
            object-fit: cover;
            width: 100%;
        }

        .hero-visual figcaption {
            position: absolute;
            inset: auto 12px 12px;
            padding: 14px 18px;
            background: rgba(16, 19, 21, .7);
            border: 1px solid rgba(255, 255, 255, .08);
            border-radius: 16px;
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            font-size: 13px;
            color: rgba(255, 255, 255, .84);
            display: flex;
            gap: 8px;
            align-items: center;
        }

        .hero-visual figcaption i {
            color: var(--accent);
        }

        .feature-section {
            background: var(--warm);
        }

        .rail-card {
            background: rgba(255, 255, 255, .66);
            border: 1px solid var(--line-light);
            border-radius: var(--radius-lg);
            padding: 12px clamp(20px, 4vw, 56px);
            box-shadow: var(--shadow-card);
        }

        .rail-row {
            display: grid;
            grid-template-columns: 54px 1.15fr 1.45fr;
            gap: 24px;
            align-items: start;
            padding: 34px 0;
            border-bottom: 1px solid var(--line-light);
        }

        .rail-row:last-child {
            border-bottom: 0;
            padding-bottom: 24px;
        }

        .rail-no {
            color: var(--accent);
            font-size: 13px;
            font-weight: 800;
            letter-spacing: .03em;
            padding-top: 6px;
        }

        .rail-head h3 {
            margin: 0 0 6px;
            font-size: 20px;
            font-weight: 750;
        }

        .route-badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            border-radius: var(--radius-rd);
            background: rgba(201, 133, 67, .1);
            color: #9A5B21;
            font-size: 12px;
            font-weight: 600;
        }

        .rail-desc {
            color: var(--mut-light);
            font-size: 15px;
            line-height: 1.85;
        }

        .rail-desc strong {
            color: var(--txt-light);
            font-weight: 600;
        }

        .scenario-section {
            background: var(--paper);
        }

        .scenario-split {
            align-items: center;
        }

        .scenario-copy {
            padding-right: clamp(0px, 4vw, 60px);
        }

        .scenario-copy h2 {
            margin-top: 12px;
            font-size: clamp(28px, 4vw, 44px);
            line-height: 1.18;
            font-weight: 800;
            letter-spacing: -.02em;
            color: var(--txt-light);
        }

        .scenario-copy .section-lead {
            margin-bottom: 24px;
        }

        .scenario-list {
            border-top: 1px solid var(--line-light);
        }

        .scenario-list li {
            display: grid;
            grid-template-columns: 122px 1fr;
            gap: 18px;
            padding: 17px 0;
            border-bottom: 1px solid var(--line-light);
        }

        .scenario-label {
            color: #8A4D1C;
            font-weight: 700;
            font-size: 15px;
            background: rgba(201, 133, 67, .08);
            border-radius: 12px;
            padding: 6px 12px;
            align-self: start;
            text-align: center;
        }

        .scenario-list p {
            color: var(--mut-light);
            font-size: 15px;
            line-height: 1.8;
        }

        .scenario-cover {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid rgba(46, 38, 28, .08);
        }

        .scenario-cover img {
            width: 100%;
            aspect-ratio: 5 / 4;
            object-fit: cover;
        }

        .process-section {
            background: var(--warm);
        }

        .process-shell {
            max-width: 940px;
            margin: 0 auto;
            background: var(--ink);
            color: var(--txt-dark);
            border-radius: var(--radius-lg);
            padding: clamp(28px, 6vw, 64px);
            position: relative;
            overflow: hidden;
        }

        .process-shell::before {
            content: "";
            position: absolute;
            top: 0;
            right: 0;
            width: 320px;
            height: 320px;
            background: radial-gradient(circle, rgba(201, 133, 67, .2), transparent 68%);
            pointer-events: none;
        }

        .process-head {
            position: relative;
            z-index: 1;
            margin-bottom: 36px;
        }

        .process-head h2 {
            margin-top: 12px;
            font-size: clamp(26px, 4vw, 42px);
            font-weight: 800;
            line-height: 1.2;
            color: #fff;
        }

        .process-head p {
            color: var(--mut-dark);
            margin-top: 12px;
            line-height: 1.85;
        }

        .process-list {
            position: relative;
            z-index: 1;
        }

        .process-list li {
            display: grid;
            grid-template-columns: 74px 1fr;
            gap: 24px;
            padding: 24px 0;
            border-top: 1px solid rgba(255, 255, 255, .1);
        }

        .process-list li:last-child {
            border-bottom: 1px solid rgba(255, 255, 255, .1);
        }

        .step-index {
            color: var(--accent-hover);
            font-weight: 800;
            font-size: 14px;
            letter-spacing: .06em;
            font-feature-settings: "tnum";
            padding-top: 5px;
        }

        .process-list h3 {
            color: #fff;
            font-size: 20px;
            font-weight: 750;
            margin-bottom: 8px;
        }

        .process-list p {
            color: var(--mut-dark);
            font-size: 15px;
            line-height: 1.85;
        }

        .faq-section {
            background: var(--paper);
        }

        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
        }

        .faq-wrap .section-head {
            text-align: center;
        }

        .faq-wrap .section-kicker::before {
            display: none;
        }

        .faq-item {
            border-bottom: 1px solid var(--line-light);
        }

        .faq-item:first-child {
            border-top: 1px solid var(--line-light);
        }

        .faq-item summary {
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 24px;
            min-height: 70px;
            padding: 10px 8px;
            font-size: 16px;
            font-weight: 650;
            color: var(--txt-light);
            transition: color .2s ease;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary::after {
            content: "+";
            width: 34px;
            height: 34px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            border: 1px solid var(--line-light);
            color: var(--accent);
            font-size: 19px;
            font-weight: 400;
            transition: all .3s ease;
            flex: 0 0 auto;
        }

        .faq-item[open] summary::after {
            content: "−";
            border-color: var(--accent);
            background: rgba(201, 133, 67, .08);
        }

        .faq-item summary:hover {
            color: var(--accent);
        }

        .faq-item summary:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: 8px;
        }

        .faq-answer {
            color: var(--mut-light);
            font-size: 15px;
            line-height: 1.9;
            padding: 0 48px 24px 8px;
        }

        .download-cta {
            position: relative;
            background: var(--ink);
            overflow: hidden;
            color: var(--txt-dark);
            padding: clamp(80px, 10vw, 124px) 0;
        }

        .download-cta::before {
            content: "";
            position: absolute;
            inset: 0;
            background:
                linear-gradient(90deg, rgba(16, 19, 21, .9), rgba(16, 19, 21, .66)),
                url('/assets/images/backpic/back-2.png') center/cover;
            opacity: .8;
        }

        .download-cta .grid-container {
            position: relative;
            z-index: 1;
            text-align: center;
        }

        .download-cta h2 {
            font-size: clamp(28px, 4.5vw, 44px);
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }

        .download-cta p {
            max-width: 640px;
            margin: 18px auto 30px;
            color: var(--mut-dark);
            line-height: 1.85;
            font-size: 16px;
        }

        .download-actions {
            display: flex;
            justify-content: center;
            gap: 14px;
            flex-wrap: wrap;
        }

        .download-actions .btn {
            min-width: 180px;
        }

        .download-note {
            margin-top: 28px;
            display: inline-flex;
            align-items: center;
            gap: 9px;
            font-size: 13px;
            color: var(--mut-dark);
            border: 1px solid rgba(255, 255, 255, .12);
            border-radius: var(--radius-rd);
            padding: 7px 16px;
            background: rgba(255, 255, 255, .03);
        }

        .download-note i {
            color: var(--accent-hover);
        }

        .footer {
            background: #0C0E10;
            color: rgba(255, 255, 255, .7);
            padding-top: 64px;
        }

        .footer-panel {
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, .08);
        }

        .footer-brand {
            color: #fff;
            font-size: 22px;
            font-weight: 800;
        }

        .footer-desc {
            max-width: 360px;
            margin-top: 14px;
            color: rgba(255, 255, 255, .54);
            font-size: 14px;
            line-height: 1.85;
        }

        .footer-head {
            color: #fff;
            font-size: 15px;
            font-weight: 700;
            margin: 10px 0 18px;
        }

        .footer-links {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            gap: 12px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, .62);
            font-size: 14px;
            transition: color .2s ease, transform .2s ease;
        }

        .footer-links a:hover {
            color: var(--accent-hover);
            transform: translateX(3px);
        }

        .footer-links a:focus-visible,
        .brand:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
            border-radius: 4px;
        }

        .footer-extra {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 24px;
            padding: 26px 0 30px;
            font-size: 12px;
            color: rgba(255, 255, 255, .36);
        }

        .to-top {
            position: fixed;
            right: 20px;
            bottom: 20px;
            z-index: 60;
            width: 48px;
            height: 48px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: var(--txt-light);
            background: rgba(255, 253, 248, .9);
            border: 1px solid var(--line-light);
            border-radius: 50%;
            box-shadow: 0 10px 30px rgba(16, 19, 21, .12);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            transition: all .25s ease;
        }

        .to-top:hover {
            color: var(--accent);
            border-color: rgba(201, 133, 67, .4);
            transform: translateY(-3px);
        }

        .to-top:focus-visible {
            outline: 3px solid rgba(201, 133, 67, .35);
            outline-offset: 3px;
        }

        @media (max-width: 900px) {
            .main-nav {
                position: fixed;
                top: 14px;
                left: 14px;
                right: 14px;
                z-index: 95;
                margin: 0;
                flex-direction: column;
                align-items: stretch;
                gap: 4px;
                padding: 16px;
                background: rgba(247, 243, 236, .96);
                border: 1px solid rgba(255, 255, 255, .8);
                border-radius: 22px;
                box-shadow: 0 30px 80px rgba(16, 19, 21, .2);
                backdrop-filter: blur(22px);
                -webkit-backdrop-filter: blur(22px);
                transform: translateY(-12px);
                opacity: 0;
                visibility: hidden;
                transition: opacity .28s ease, transform .28s ease, visibility .28s;
            }

            .main-nav.is-open {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }

            .main-nav .nav-link {
                width: 100%;
                height: 52px;
                justify-content: center;
                border-radius: 14px;
                font-size: 16px;
            }

            .main-nav .nav-link::after {
                display: none;
            }

            .main-nav .nav-link.is-active {
                background: rgba(201, 133, 67, .1);
            }

            .mobile-close-btn {
                display: flex;
                align-items: center;
                justify-content: center;
                align-self: flex-end;
                width: 38px;
                height: 38px;
                border-radius: 50%;
                border: 1px solid var(--line-light);
                color: var(--txt-light);
                margin-bottom: 4px;
                background: #fff;
            }

            .nav-burger {
                display: inline-flex;
            }

            .header-actions .btn-sm {
                display: none;
            }

            .header-actions .btn {
                padding: 0;
                background: transparent;
                box-shadow: none;
                color: var(--txt-light);
            }

            .anchor-text {
                display: none;
            }

            .nav-master {
                height: 68px;
                background: rgba(247, 243, 236, .94);
            }

            .rail-row {
                grid-template-columns: 42px 1fr;
                gap: 14px;
                padding: 26px 0;
            }

            .rail-desc {
                grid-column: 1 / -1;
                padding-left: 56px;
            }

            .scenario-split {
                row-gap: 36px;
            }

            .scenario-copy {
                padding-right: 0;
            }

            .cat-hero h1 {
                font-size: clamp(34px, 8vw, 48px);
            }

            .process-list li {
                grid-template-columns: 46px 1fr;
                gap: 14px;
            }

            .download-actions {
                flex-direction: column;
                align-items: center;
            }

            .download-actions .btn {
                width: 100%;
                max-width: 360px;
            }
        }

        @media (max-width: 620px) {
            .site-header .grid-container {
                max-width: calc(100% - 20px);
                padding: 0;
            }

            .brand-text {
                font-size: 16px;
            }

            .brand-mark {
                width: 38px;
                height: 38px;
                font-size: 18px;
                border-radius: 12px;
            }

            .cat-hero {
                padding-top: 122px;
            }

            .cat-hero h1 {
                margin-top: 20px;
            }

            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }

            .hero-actions .btn {
                width: 100%;
            }

            .section {
                padding: clamp(56px, 14vw, 80px) 0;
            }

            .rail-card {
                padding: 6px 18px;
            }

            .rail-desc {
                padding-left: 0;
                grid-column: 1 / -1;
            }

            .scenario-list li {
                grid-template-columns: 1fr;
                gap: 8px;
            }

            .scenario-label {
                justify-self: start;
            }

            .process-shell {
                padding: 24px 22px;
            }

            .process-list li {
                grid-template-columns: 1fr;
                gap: 6px;
                padding: 22px 0;
            }

            .faq-item summary {
                font-size: 15px;
                line-height: 1.5;
            }

            .faq-answer {
                padding-left: 0;
                padding-right: 0;
                padding-bottom: 20px;
            }

            .footer-extra {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            * {
                animation-duration: .01ms !important;
                transition-duration: .01ms !important;
                scroll-behavior: auto !important;
            }
        }