/* roulang page: index */
:root {
            --blue: #2468c9;
            --blue-dark: #174d9c;
            --blue-soft: #eaf2ff;
            --ink: #192a40;
            --text: #44546a;
            --muted: #718096;
            --line: #e2e9f2;
            --paper: #ffffff;
            --wash: #f5f8fc;
            --mint: #168a73;
            --mint-soft: #e7f5f0;
            --orange: #e88347;
            --orange-soft: #fff0e6;
            --lavender: #6457b7;
            --shadow: 0 10px 28px rgba(35, 69, 112, .08);
            --shadow-hover: 0 16px 34px rgba(35, 69, 112, .14);
            --radius: 12px;
            --radius-sm: 8px;
            --container: 1220px;
        }
        *, *::before, *::after { box-sizing: border-box; }
        html { scroll-behavior: smooth; scroll-padding-top: 92px; }
        body {
            margin: 0;
            background: var(--wash);
            color: var(--ink);
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            font-size: 15px;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a { color: inherit; text-decoration: none; transition: color .18s ease, background .18s ease, border-color .18s ease, transform .18s ease, box-shadow .18s ease; }
        a:hover { color: var(--blue); }
        button { font: inherit; }
        img { display: block; width: 100%; height: auto; object-fit: cover; }
        :focus-visible { outline: 3px solid rgba(36, 104, 201, .42); outline-offset: 3px; }
        .container { width: min(var(--container), calc(100% - 48px)); margin-inline: auto; }
        .site-header { position: sticky; z-index: 20; top: 0; background: rgba(255,255,255,.97); border-bottom: 1px solid var(--line); box-shadow: 0 4px 16px rgba(35,69,112,.035); }
        .nav-wrap { min-height: 76px; display: flex; align-items: center; gap: 30px; }
        .brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; color: var(--ink); }
        .brand-mark { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 9px; background: var(--blue); color: #fff; font-size: 20px; font-weight: 800; box-shadow: 0 5px 12px rgba(36,104,201,.2); }
        .brand-copy { display: grid; line-height: 1.25; }
        .brand-name { font-size: 17px; font-weight: 800; }
        .brand-note { margin-top: 4px; color: var(--muted); font-size: 11px; }
        .nav-toggle { display: none; margin-left: auto; border: 1px solid var(--line); background: #fff; width: 42px; height: 40px; border-radius: var(--radius-sm); color: var(--ink); cursor: pointer; }
        .nav-menu { display: flex; align-items: center; justify-content: center; gap: 23px; margin-left: auto; }
        .nav-menu a { color: #4c5c70; font-size: 13px; font-weight: 600; white-space: nowrap; }
        .nav-menu a:hover, .nav-menu a.active { color: var(--blue); }
        .nav-cta { flex: 0 0 auto; }
        .button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; gap: 8px; padding: 0 19px; border: 1px solid transparent; border-radius: 9px; font-size: 14px; font-weight: 700; cursor: pointer; }
        .button-primary { color: #fff; background: var(--blue); box-shadow: 0 6px 14px rgba(36,104,201,.16); }
        .button-primary:hover { color: #fff; background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 9px 18px rgba(36,104,201,.22); }
        .button-secondary { color: var(--blue); background: #fff; border-color: #cbd9ec; }
        .button-secondary:hover { color: var(--blue-dark); background: var(--blue-soft); border-color: #9dbbe5; }
        main { overflow: hidden; }
        .hero { position: relative; padding: 56px 0 48px; background: #fff; }
        .hero::before { position: absolute; content: ""; width: 340px; height: 220px; top: 8px; left: -170px; background: #edf4ff; border-radius: 50%; filter: blur(2px); opacity: .75; }
        .hero-grid { position: relative; display: grid; grid-template-columns: 1fr 1.05fr; gap: 54px; align-items: center; }
        .eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--blue); font-size: 12px; font-weight: 800; }
        .eyebrow::before { content: ""; width: 20px; height: 2px; background: var(--orange); }
        h1, h2, h3, p { margin-top: 0; }
        h1 { max-width: 540px; margin-bottom: 13px; font-size: clamp(34px, 4vw, 48px); line-height: 1.22; font-weight: 800; }
        .hero-highlight { color: var(--blue); position: relative; white-space: nowrap; }
        .hero-highlight::after { position: absolute; content: ""; height: 8px; bottom: 1px; left: 0; right: 0; background: #ffe0ca; z-index: -1; }
        .hero-subtitle { margin-bottom: 14px; color: #344b67; font-size: 17px; font-weight: 700; }
        .hero-copy { max-width: 560px; margin-bottom: 23px; color: var(--text); line-height: 1.85; }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
        .hero-proof { margin-top: 22px; display: flex; align-items: center; gap: 18px; color: var(--muted); font-size: 12px; }
        .hero-proof strong { color: var(--ink); font-size: 15px; }
        .proof-divider { width: 1px; height: 24px; background: var(--line); }
        .hero-art { min-height: 370px; position: relative; padding: 14px 8px 14px 28px; }
        .hero-cover { position: absolute; overflow: hidden; border: 5px solid #fff; border-radius: 11px; box-shadow: 0 18px 38px rgba(26,51,83,.2); background: #d6e4f3; }
        .hero-cover img { width: 100%; height: 100%; }
        .hero-cover-main { inset: 9px 102px 31px 90px; transform: rotate(2deg); }
        .hero-cover-left { width: 144px; height: 184px; left: 6px; top: 93px; transform: rotate(-7deg); }
        .hero-cover-right { width: 142px; height: 174px; right: 0; top: 38px; transform: rotate(7deg); }
        .hero-cover-bottom { width: 135px; height: 145px; right: 24px; bottom: 0; transform: rotate(5deg); }
        .hero-badge { position: absolute; z-index: 2; display: flex; align-items: center; gap: 8px; padding: 9px 12px; color: var(--ink); background: #fff; border: 1px solid var(--line); border-radius: 9px; box-shadow: var(--shadow); font-size: 12px; font-weight: 700; }
        .hero-badge-top { top: 3px; left: 65px; }
        .hero-badge-bottom { left: 0; bottom: 14px; }
        .badge-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 4px var(--mint-soft); }
        .section { padding: 62px 0; }
        .section-white { background: #fff; }
        .section-tint { background: #f0f5fc; }
        .section-head { margin-bottom: 25px; display: flex; align-items: end; justify-content: space-between; gap: 24px; }
        .section-kicker { margin-bottom: 4px; color: var(--blue); font-size: 11px; font-weight: 800; }
        .section-title { margin-bottom: 0; font-size: 25px; line-height: 1.3; font-weight: 800; }
        .section-desc { max-width: 670px; margin: 8px 0 0; color: var(--text); font-size: 13px; line-height: 1.8; }
        .section-link { flex: 0 0 auto; color: var(--blue); font-size: 13px; font-weight: 700; }
        .discovery-band { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }
        .discovery-item { min-height: 120px; padding: 22px 25px; display: flex; align-items: flex-start; gap: 15px; }
        .discovery-item + .discovery-item { border-left: 1px solid var(--line); }
        .feature-icon { flex: 0 0 38px; height: 38px; display: grid; place-items: center; border-radius: 10px; color: var(--blue); background: var(--blue-soft); font-weight: 800; }
        .discovery-item:nth-child(2) .feature-icon { color: var(--orange); background: var(--orange-soft); }
        .discovery-item:nth-child(3) .feature-icon { color: var(--mint); background: var(--mint-soft); }
        .discovery-item h3 { margin: 0 0 5px; font-size: 15px; }
        .discovery-item p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.65; }
        .steps { display: grid; grid-template-columns: repeat(4, 1fr); position: relative; }
        .steps::before { content: ""; position: absolute; top: 22px; left: 9%; right: 9%; height: 1px; background: #cddbee; }
        .step { position: relative; padding: 0 20px; text-align: center; }
        .step-number { position: relative; z-index: 1; width: 44px; height: 44px; margin: 0 auto 12px; display: grid; place-items: center; border-radius: 50%; background: #fff; border: 1px solid #bfd2ec; color: var(--blue); font-size: 13px; font-weight: 800; box-shadow: 0 0 0 6px var(--wash); }
        .step h3 { margin-bottom: 4px; font-size: 15px; }
        .step p { margin: 0 auto; max-width: 220px; color: var(--muted); font-size: 12px; }
        .video-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
        .video-card, .popular-card { min-width: 0; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: 0 5px 18px rgba(35,69,112,.05); transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
        .video-card:hover, .popular-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: #c9d9ee; }
        .video-image { position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: #e8eef6; }
        .video-image img, .popular-image img { height: 100%; transition: transform .35s ease; }
        .video-card:hover .video-image img, .popular-card:hover .popular-image img { transform: scale(1.035); }
        .status { display: inline-flex; align-items: center; padding: 3px 8px; border-radius: 5px; background: var(--mint-soft); color: #16705f; font-size: 10px; line-height: 1.5; font-weight: 800; }
        .video-image .status { position: absolute; top: 10px; left: 10px; }
        .status-blue { background: #edf0ff; color: var(--lavender); }
        .status-hot { background: var(--orange-soft); color: #b45c2b; }
        .video-body { padding: 12px 13px 13px; }
        .video-title { min-height: 44px; margin: 0 0 8px; font-size: 14px; line-height: 1.55; font-weight: 700; }
        .video-meta { display: flex; align-items: center; justify-content: space-between; gap: 8px; color: var(--muted); font-size: 11px; }
        .rating { color: #b45c2b; font-weight: 800; font-variant-numeric: tabular-nums; white-space: nowrap; }
        .type-label { display: inline-block; margin-top: 8px; color: var(--blue); font-size: 10px; }
        .stats-strip { display: grid; grid-template-columns: repeat(4, 1fr); padding: 24px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
        .stat { padding: 4px 24px; }
        .stat + .stat { border-left: 1px solid var(--line); }
        .stat strong { display: block; color: var(--blue-dark); font-size: 29px; line-height: 1.2; font-weight: 800; font-variant-numeric: tabular-nums; }
        .stat span { display: block; margin-top: 5px; color: var(--muted); font-size: 12px; }
        .popular-layout { display: grid; grid-template-columns: 1.15fr 1fr 1fr; gap: 18px; }
        .popular-card.featured { grid-row: span 2; }
        .popular-image { aspect-ratio: 16 / 10; overflow: hidden; background: #e8eef6; }
        .popular-card:not(.featured) { display: grid; grid-template-columns: 40% 1fr; }
        .popular-card:not(.featured) .popular-image { aspect-ratio: auto; min-height: 145px; }
        .popular-info { padding: 14px; display: flex; flex-direction: column; align-items: flex-start; }
        .popular-info h3 { margin: 7px 0 5px; font-size: 15px; line-height: 1.5; }
        .popular-info p { margin: 0 0 9px; color: var(--muted); font-size: 12px; line-height: 1.65; }
        .popular-card:not(.featured) .popular-info { padding: 10px 12px; }
        .popular-card:not(.featured) .popular-info h3 { margin: 2px 0 4px; font-size: 13px; }
        .popular-card:not(.featured) .popular-info p { font-size: 11px; margin-bottom: 5px; }
        .popular-metrics { display: flex; gap: 11px; margin-top: auto; color: var(--muted); font-size: 10px; }
        .feedback-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
        .quote { padding: 21px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }
        .quote-mark { color: var(--orange); font-size: 26px; line-height: 1; font-weight: 800; }
        .quote p { margin: 9px 0 16px; color: #34465b; font-size: 14px; line-height: 1.8; }
        .quote-user { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: 12px; }
        .avatar { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%; color: var(--blue); background: var(--blue-soft); font-weight: 800; }
        .scene-grid { display: grid; grid-template-columns: 1.25fr 1fr 1fr 1.15fr; gap: 13px; }
        .scene { min-height: 118px; padding: 17px; display: flex; flex-direction: column; justify-content: space-between; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
        .scene:nth-child(2) { background: #f1f6ff; }
        .scene:nth-child(3) { background: #fff7f1; }
        .scene:nth-child(4) { background: #eff8f5; }
        .scene strong { font-size: 15px; }
        .scene span { color: var(--muted); font-size: 12px; }
        .channel-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: 16px; }
        .channel-feature { min-height: 190px; padding: 23px; display: flex; flex-direction: column; justify-content: space-between; border: 1px solid #dce7f5; border-left: 4px solid var(--blue); border-radius: 10px; background: #fff; }
        .channel-feature:nth-child(2) { border-left-color: var(--orange); }
        .channel-side { display: grid; gap: 16px; }
        .channel-small { padding: 18px 20px; border: 1px solid var(--line); border-left: 4px solid var(--mint); border-radius: 10px; background: #fff; }
        .channel-small:last-child { border-left-color: var(--lavender); }
        .channel-feature h3, .channel-small h3 { margin: 0 0 7px; font-size: 17px; }
        .channel-feature p, .channel-small p { max-width: 490px; margin: 0; color: var(--text); font-size: 13px; line-height: 1.8; }
        .channel-arrow { align-self: flex-end; color: var(--blue); font-size: 12px; font-weight: 700; }
        .rank-layout { display: grid; grid-template-columns: 1.15fr .85fr; gap: 28px; align-items: start; }
        .rank-list { border-top: 1px solid var(--line); }
        .rank-row { min-height: 48px; display: grid; grid-template-columns: 36px minmax(0, 1fr) 78px 52px 82px; align-items: center; gap: 9px; border-bottom: 1px solid var(--line); font-size: 12px; }
        .rank-number { width: 25px; height: 25px; display: grid; place-items: center; border-radius: 6px; background: #edf2f8; color: #607084; font-weight: 800; }
        .rank-row:nth-child(1) .rank-number { color: #b55a31; background: #fff0e5; }
        .rank-row:nth-child(2) .rank-number { color: var(--blue); background: #e9f1ff; }
        .rank-row:nth-child(3) .rank-number { color: var(--mint); background: #e8f6f1; }
        .rank-name { overflow: hidden; color: var(--ink); font-weight: 700; text-overflow: ellipsis; white-space: nowrap; }
        .rank-heat, .rank-score { color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
        .rank-score { color: #b45c2b; font-weight: 700; }
        .rank-type { color: var(--blue); font-size: 10px; white-space: nowrap; }
        .rank-feature { overflow: hidden; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
        .rank-feature img { aspect-ratio: 16 / 10; }
        .rank-feature-body { padding: 16px 18px; }
        .rank-feature-body h3 { margin: 0 0 6px; font-size: 16px; }
        .rank-feature-body p { margin: 0; color: var(--muted); font-size: 12px; }
        .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
        .news-item { display: grid; grid-template-columns: 112px 1fr; gap: 14px; padding: 13px; border: 1px solid var(--line); border-radius: 10px; background: #fff; transition: box-shadow .2s ease, transform .2s ease; }
        .news-item:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
        .news-item img { height: 94px; border-radius: 7px; background: #e8eef6; }
        .news-item time { color: var(--orange); font-size: 10px; font-weight: 700; }
        .news-item h3 { margin: 4px 0 4px; font-size: 13px; line-height: 1.5; }
        .news-item p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.6; }
        .metrics-panel { display: grid; grid-template-columns: 1.2fr repeat(3, 1fr); align-items: center; gap: 22px; padding: 25px 28px; border: 1px solid #dce8f7; border-radius: var(--radius); background: #edf4fd; }
        .metrics-intro h3 { margin: 0 0 6px; font-size: 17px; }
        .metrics-intro p { margin: 0; color: var(--muted); font-size: 12px; }
        .metric { padding-left: 18px; border-left: 1px solid #cddbef; }
        .metric strong { display: block; color: var(--blue-dark); font-size: 21px; font-weight: 800; }
        .metric span { color: var(--muted); font-size: 11px; }
        .metric-bar { height: 4px; margin-top: 9px; overflow: hidden; border-radius: 5px; background: #d9e5f5; }
        .metric-bar i { display: block; height: 100%; border-radius: inherit; background: var(--blue); }
        .faq-list { border-top: 1px solid var(--line); }
        .faq-item { border-bottom: 1px solid var(--line); }
        .faq-item summary { position: relative; padding: 17px 42px 17px 4px; color: var(--ink); cursor: pointer; font-size: 14px; font-weight: 700; list-style: none; }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary::after { content: "+"; position: absolute; top: 13px; right: 8px; color: var(--blue); font-size: 21px; font-weight: 400; }
        .faq-item[open] summary::after { content: "−"; }
        .faq-item p { max-width: 900px; margin: -2px 42px 17px 4px; color: var(--text); font-size: 13px; line-height: 1.8; }
        .cta-band { padding: 32px 36px; display: flex; justify-content: space-between; align-items: center; gap: 25px; border: 1px solid #dce8f7; border-radius: var(--radius); background: linear-gradient(100deg, #edf4ff 0%, #f7faff 70%, #fff4ec 100%); }
        .cta-band h2 { margin: 0 0 5px; font-size: 23px; }
        .cta-band p { margin: 0; color: var(--text); font-size: 13px; }
        .cta-actions { display: flex; flex-wrap: wrap; gap: 10px; }
        .site-footer { padding: 43px 0 18px; background: #eaf0f7; border-top: 1px solid #dce5ef; }
        .footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 35px; padding-bottom: 28px; }
        .footer-brand p { max-width: 270px; margin: 12px 0 0; color: #56677b; font-size: 12px; line-height: 1.8; }
        .footer-heading { margin: 4px 0 12px; color: var(--ink); font-size: 13px; font-weight: 800; }
        .footer-links { display: grid; gap: 8px; }
        .footer-links a { width: fit-content; color: #596b80; font-size: 12px; }
        .footer-links a:hover { color: var(--blue); }
        .copyright { display: flex; justify-content: space-between; gap: 15px; padding-top: 15px; border-top: 1px solid #d5dfeb; color: #6c7b8e; font-size: 11px; }
        @media (max-width: 1100px) {
            .nav-wrap { gap: 18px; }
            .nav-menu { gap: 15px; }
            .nav-menu a { font-size: 12px; }
            .video-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
            .popular-layout { grid-template-columns: 1fr 1fr; }
            .popular-card.featured { grid-row: span 2; }
            .news-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 820px) {
            .container { width: min(100% - 36px, var(--container)); }
            .nav-wrap { min-height: 68px; flex-wrap: wrap; }
            .nav-toggle { display: grid; place-items: center; }
            .nav-cta { display: none; }
            .nav-menu { display: none; order: 3; width: 100%; margin: 0; padding: 0 0 14px; flex-wrap: wrap; justify-content: flex-start; gap: 0; }
            .nav-menu.is-open { display: flex; }
            .nav-menu a { width: 33.333%; padding: 10px 4px; }
            .hero { padding: 42px 0 35px; }
            .hero-grid { grid-template-columns: 1fr; gap: 14px; }
            .hero-art { min-height: 320px; width: min(100%, 560px); margin: 0 auto; }
            .section { padding: 48px 0; }
            .video-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
            .stats-strip { grid-template-columns: repeat(2, 1fr); row-gap: 18px; }
            .stat:nth-child(3) { border-left: 0; }
            .rank-layout { grid-template-columns: 1fr; }
            .rank-feature { display: grid; grid-template-columns: 40% 1fr; align-items: center; }
            .rank-feature img { height: 100%; aspect-ratio: auto; }
            .scene-grid { grid-template-columns: repeat(2, 1fr); }
            .metrics-panel { grid-template-columns: repeat(3, 1fr); }
            .metrics-intro { grid-column: 1 / -1; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 576px) {
            .container { width: calc(100% - 30px); }
            .brand-mark { width: 38px; height: 38px; }
            .brand-name { font-size: 15px; }
            .nav-menu a { width: 50%; }
            .hero { padding-top: 34px; }
            h1 { font-size: 35px; }
            .hero-subtitle { font-size: 15px; }
            .hero-copy { font-size: 13px; }
            .hero-actions .button { flex: 1 1 auto; padding-inline: 12px; }
            .hero-proof { gap: 12px; }
            .hero-art { min-height: 278px; transform: scale(.93); transform-origin: top center; margin-bottom: -18px; }
            .hero-cover-main { inset: 14px 70px 28px 74px; }
            .hero-cover-left { width: 112px; height: 145px; top: 75px; }
            .hero-cover-right { width: 112px; height: 138px; }
            .hero-cover-bottom { width: 106px; height: 114px; }
            .hero-badge-top { left: 34px; }
            .section { padding: 39px 0; }
            .section-head { align-items: flex-start; flex-direction: column; gap: 9px; margin-bottom: 19px; }
            .section-title { font-size: 22px; }
            .section-desc { font-size: 12px; }
            .discovery-band { grid-template-columns: 1fr; }
            .discovery-item { min-height: auto; padding: 17px; }
            .discovery-item + .discovery-item { border-left: 0; border-top: 1px solid var(--line); }
            .steps { grid-template-columns: 1fr; gap: 15px; }
            .steps::before { top: 18px; bottom: 18px; left: 21px; right: auto; width: 1px; height: auto; }
            .step { min-height: 45px; padding: 0; display: grid; grid-template-columns: 44px 1fr; column-gap: 13px; text-align: left; }
            .step-number { grid-row: span 2; margin: 0; box-shadow: 0 0 0 5px var(--wash); }
            .step h3 { margin: 1px 0 2px; }
            .step p { margin: 0; max-width: none; }
            .video-grid { gap: 10px; }
            .video-body { padding: 10px; }
            .video-title { min-height: 42px; font-size: 12px; }
            .video-meta { font-size: 10px; }
            .video-image .status { top: 6px; left: 6px; font-size: 9px; }
            .type-label { font-size: 9px; }
            .stats-strip { padding: 17px 0; }
            .stat { padding: 3px 12px; }
            .stat strong { font-size: 24px; }
            .popular-layout { grid-template-columns: 1fr; }
            .popular-card.featured { grid-row: auto; }
            .popular-card:not(.featured) { min-height: 128px; }
            .feedback-grid { grid-template-columns: 1fr; }
            .quote { padding: 17px; }
            .scene-grid { gap: 9px; }
            .scene { min-height: 105px; padding: 13px; }
            .channel-layout { grid-template-columns: 1fr; }
            .channel-feature { min-height: 165px; }
            .rank-row { grid-template-columns: 29px minmax(0, 1fr) 61px 43px; gap: 6px; font-size: 10px; }
            .rank-type { display: none; }
            .rank-feature { grid-template-columns: 38% 1fr; }
            .rank-feature-body { padding: 11px; }
            .news-grid { grid-template-columns: 1fr; gap: 10px; }
            .news-item { grid-template-columns: 96px 1fr; gap: 11px; }
            .news-item img { height: 82px; }
            .metrics-panel { grid-template-columns: repeat(2, 1fr); gap: 17px 12px; padding: 19px; }
            .metrics-intro { grid-column: 1 / -1; }
            .metric:nth-child(3) { border-left: 0; padding-left: 0; }
            .faq-item summary { font-size: 13px; }
            .cta-band { align-items: flex-start; flex-direction: column; padding: 23px 19px; }
            .cta-band h2 { font-size: 20px; }
            .cta-actions { width: 100%; }
            .cta-actions .button { flex: 1; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px 16px; }
            .footer-brand { grid-column: 1 / -1; }
            .copyright { flex-direction: column; gap: 4px; }
        }
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
        }

/* roulang page: category1 */
:root {
      --blue: #2468c9;
      --blue-dark: #174d9c;
      --blue-soft: #eaf2ff;
      --ink: #192a40;
      --text: #44546a;
      --muted: #718096;
      --line: #e2e9f2;
      --paper: #ffffff;
      --wash: #f5f8fc;
      --mint: #168a73;
      --mint-soft: #e7f5f0;
      --orange: #e88347;
      --orange-soft: #fff0e6;
      --lavender: #6457b7;
      --shadow: 0 10px 28px rgba(35, 69, 112, .08);
      --shadow-hover: 0 16px 34px rgba(35, 69, 112, .14);
      --radius: 12px;
      --radius-sm: 8px;
      --container: 1220px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 92px; }
    body {
      margin: 0;
      background: var(--wash);
      color: var(--ink);
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      font-size: 15px;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; transition: color .18s ease, background .18s ease, border-color .18s ease, transform .18s ease, box-shadow .18s ease; }
    a:hover { color: var(--blue); }
    a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid rgba(36,104,201,.42); outline-offset: 3px; }
    button { font: inherit; }
    img { display: block; width: 100%; height: auto; object-fit: cover; }
    .container { width: min(var(--container), calc(100% - 48px)); margin-inline: auto; }
    .site-header { position: sticky; z-index: 20; top: 0; background: rgba(255,255,255,.97); border-bottom: 1px solid var(--line); box-shadow: 0 4px 16px rgba(35,69,112,.035); }
    .nav-wrap { min-height: 76px; display: flex; align-items: center; gap: 30px; }
    .brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; color: var(--ink); }
    .brand:hover { color: var(--blue); }
    .brand-mark { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 9px; background: var(--blue); color: #fff; font-size: 20px; font-weight: 800; box-shadow: 0 5px 12px rgba(36,104,201,.2); }
    .brand-copy { display: grid; line-height: 1.25; }
    .brand-name { font-size: 17px; font-weight: 800; }
    .brand-note { margin-top: 4px; color: var(--muted); font-size: 11px; }
    .nav-toggle { display: none; margin-left: auto; border: 1px solid var(--line); background: #fff; width: 42px; height: 40px; border-radius: var(--radius-sm); color: var(--ink); cursor: pointer; }
    .nav-menu { display: flex; align-items: center; justify-content: center; gap: 23px; margin-left: auto; }
    .nav-menu a { color: #4c5c70; font-size: 13px; font-weight: 600; white-space: nowrap; }
    .nav-menu a:hover, .nav-menu a.active { color: var(--blue); }
    .button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; gap: 8px; padding: 0 19px; border: 1px solid transparent; border-radius: 9px; font-size: 14px; font-weight: 700; cursor: pointer; }
    .button-primary { color: #fff; background: var(--blue); box-shadow: 0 6px 14px rgba(36,104,201,.16); }
    .button-primary:hover { color: #fff; background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 9px 18px rgba(36,104,201,.22); }
    .button-secondary { color: var(--blue); background: #fff; border-color: #cbd9ec; }
    .button-secondary:hover { color: var(--blue-dark); background: var(--blue-soft); border-color: #9dbbe5; }
    main { overflow: hidden; }
    .page-intro { padding: 45px 0 34px; background: #fff; border-bottom: 1px solid var(--line); }
    .intro-grid { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(260px, .7fr); gap: 48px; align-items: end; }
    .eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--blue); font-size: 12px; font-weight: 800; }
    .eyebrow::before { content: ""; width: 20px; height: 2px; background: var(--orange); }
    h1 { max-width: 760px; margin: 10px 0 12px; font-size: clamp(30px, 3.2vw, 42px); line-height: 1.25; font-weight: 800; }
    .intro-copy { max-width: 740px; margin: 0; color: var(--text); font-size: 15px; }
    .intro-aside { padding: 17px 20px; border-left: 3px solid var(--orange); background: #fff8f3; color: var(--text); }
    .intro-aside strong { display: block; margin-bottom: 4px; color: var(--ink); font-size: 14px; }
    .intro-aside span { font-size: 13px; }
    .section { padding: 36px 0; }
    .section-white { background: #fff; }
    .section-tint { background: #f0f5fc; }
    .section-head { margin-bottom: 20px; display: flex; align-items: end; justify-content: space-between; gap: 24px; }
    .section-kicker { margin-bottom: 4px; color: var(--blue); font-size: 11px; font-weight: 800; }
    .section-title { margin: 0; font-size: 23px; line-height: 1.3; font-weight: 800; }
    .section-desc { max-width: 670px; margin: 7px 0 0; color: var(--text); font-size: 13px; line-height: 1.8; }
    .section-link { flex: 0 0 auto; color: var(--blue); font-size: 13px; font-weight: 700; }
    .filter-bar { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; padding: 15px 17px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 5px 16px rgba(35,69,112,.04); }
    .filter-label { margin-right: 4px; color: var(--muted); font-size: 12px; font-weight: 700; }
    .filter-chip { min-height: 34px; display: inline-flex; align-items: center; padding: 0 13px; border: 1px solid var(--line); border-radius: 7px; background: #fff; color: var(--text); font-size: 12px; font-weight: 600; }
    .filter-chip:hover { border-color: #a9c3e7; background: var(--blue-soft); color: var(--blue); }
    .filter-chip.is-active { border-color: var(--blue); background: var(--blue); color: #fff; }
    .filter-end { margin-left: auto; color: var(--muted); font-size: 12px; }
    .catalog-layout { display: grid; grid-template-columns: minmax(0, 1fr) 275px; gap: 25px; align-items: start; }
    .catalog-list { display: grid; gap: 14px; }
    .content-row { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 20px; padding: 13px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 5px 18px rgba(35,69,112,.045); transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease; }
    .content-row:hover { transform: translateY(-2px); border-color: #c9d9ee; box-shadow: var(--shadow); }
    .content-thumb { position: relative; overflow: hidden; aspect-ratio: 16 / 10; border-radius: 8px; background: #dbe8f5; }
    .content-thumb img { width: 100%; height: 100%; transition: transform .3s ease; }
    .content-row:hover .content-thumb img { transform: scale(1.035); }
    .content-details { min-width: 0; display: flex; flex-direction: column; justify-content: center; padding: 2px 4px 2px 0; }
    .content-topline { display: flex; align-items: center; gap: 8px; margin-bottom: 7px; }
    .badge { display: inline-flex; align-items: center; min-height: 23px; padding: 2px 8px; border-radius: 5px; font-size: 11px; font-weight: 800; white-space: nowrap; }
    .badge-mint { color: var(--mint); background: var(--mint-soft); }
    .badge-blue { color: var(--blue); background: var(--blue-soft); }
    .badge-orange { color: #b95d27; background: var(--orange-soft); }
    .content-type { color: var(--muted); font-size: 11px; }
    .content-title { margin: 0 0 6px; font-size: 17px; line-height: 1.4; font-weight: 800; }
    .content-summary { margin: 0 0 10px; color: var(--text); font-size: 12px; line-height: 1.7; }
    .content-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 14px; color: var(--muted); font-size: 11px; }
    .rating { color: var(--orange); font-weight: 800; }
    .row-arrow { margin-left: auto; color: var(--blue); font-size: 18px; }
    .side-panel { overflow: hidden; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 6px 20px rgba(35,69,112,.05); }
    .side-panel + .side-panel { margin-top: 17px; }
    .side-heading { padding: 16px 17px 12px; border-bottom: 1px solid var(--line); }
    .side-heading h2 { margin: 0; font-size: 16px; line-height: 1.4; }
    .side-heading p { margin: 4px 0 0; color: var(--muted); font-size: 11px; }
    .rank-list { margin: 0; padding: 4px 16px 12px; list-style: none; }
    .rank-item { display: grid; grid-template-columns: 25px minmax(0, 1fr) auto; gap: 8px; align-items: center; padding: 10px 0; border-bottom: 1px solid #edf1f6; }
    .rank-item:last-child { border-bottom: 0; }
    .rank-number { width: 22px; height: 22px; display: grid; place-items: center; border-radius: 6px; background: #f0f4f9; color: var(--muted); font-size: 11px; font-weight: 800; }
    .rank-item:nth-child(-n+3) .rank-number { background: var(--blue-soft); color: var(--blue); }
    .rank-name { overflow: hidden; color: var(--ink); font-size: 12px; font-weight: 700; text-overflow: ellipsis; white-space: nowrap; }
    .rank-score { color: var(--orange); font-size: 11px; font-weight: 800; }
    .rank-heat { padding: 0 16px 16px; color: var(--muted); font-size: 11px; }
    .rank-heat strong { color: var(--ink); }
    .update-list { margin: 0; padding: 5px 17px 15px; list-style: none; }
    .update-item { position: relative; padding: 11px 0 11px 15px; border-bottom: 1px solid #edf1f6; }
    .update-item:last-child { border-bottom: 0; }
    .update-item::before { position: absolute; content: ""; top: 18px; left: 0; width: 7px; height: 7px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 3px var(--mint-soft); }
    .update-date { display: block; margin-bottom: 3px; color: var(--muted); font-size: 10px; }
    .update-name { display: flex; justify-content: space-between; gap: 8px; color: var(--ink); font-size: 12px; font-weight: 700; }
    .update-name span:last-child { flex: 0 0 auto; color: var(--mint); font-size: 10px; }
    .tips-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
    .tip { min-height: 112px; display: grid; grid-template-columns: 38px 1fr; gap: 13px; align-content: center; padding: 17px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm); }
    .tip-icon { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 9px; background: var(--blue-soft); color: var(--blue); font-size: 14px; font-weight: 800; }
    .tip h3 { margin: 0 0 4px; font-size: 14px; }
    .tip p { margin: 0; color: var(--text); font-size: 12px; line-height: 1.65; }
    .article-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .article { min-height: 164px; display: flex; flex-direction: column; padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 5px 18px rgba(35,69,112,.04); }
    .article-date { color: var(--muted); font-size: 11px; }
    .article h3 { margin: 9px 0 7px; font-size: 15px; line-height: 1.5; }
    .article p { margin: 0; color: var(--text); font-size: 12px; line-height: 1.7; }
    .article:hover { transform: translateY(-2px); border-color: #c9d9ee; box-shadow: var(--shadow); }
    .cta-band { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 25px 29px; background: #eaf2ff; border: 1px solid #d9e7fb; border-radius: var(--radius); }
    .cta-band h2 { margin: 0 0 4px; font-size: 21px; }
    .cta-band p { margin: 0; color: var(--text); font-size: 13px; }
    .cta-actions { display: flex; flex-wrap: wrap; gap: 10px; }
    .site-footer { padding: 43px 0 18px; background: #edf2f8; border-top: 1px solid var(--line); }
    .footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 30px; padding-bottom: 29px; }
    .footer-brand p { max-width: 330px; margin: 14px 0 0; color: var(--text); font-size: 12px; line-height: 1.8; }
    .footer-heading { margin: 0 0 12px; font-size: 13px; font-weight: 800; }
    .footer-links { display: grid; gap: 8px; }
    .footer-links a { width: fit-content; color: var(--text); font-size: 12px; }
    .footer-links a:hover { color: var(--blue); }
    .copyright { display: flex; justify-content: space-between; gap: 14px; padding-top: 15px; border-top: 1px solid #dce4ee; color: var(--muted); font-size: 11px; }
    @media (max-width: 1100px) {
      .nav-wrap { gap: 18px; }
      .nav-menu { gap: 14px; }
      .nav-menu a { font-size: 12px; }
      .catalog-layout { grid-template-columns: minmax(0, 1fr) 250px; gap: 18px; }
      .content-row { grid-template-columns: 190px minmax(0,1fr); }
    }
    @media (max-width: 900px) {
      .nav-cta { display: none; }
      .nav-toggle { display: block; }
      .nav-menu { display: none; position: absolute; top: 76px; left: 0; right: 0; margin: 0; padding: 12px 24px 18px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
      .nav-menu.is-open { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; }
      .nav-menu a { padding: 10px 5px; }
      .intro-grid { gap: 25px; }
      .catalog-layout { grid-template-columns: 1fr; }
      .catalog-side { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
      .side-panel + .side-panel { margin-top: 0; }
      .article-list { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .nav-wrap { min-height: 68px; gap: 12px; }
      .brand-mark { width: 38px; height: 38px; }
      .brand-name { font-size: 15px; }
      .nav-menu { top: 68px; padding-inline: 16px; }
      .nav-menu.is-open { grid-template-columns: repeat(2, 1fr); }
      .page-intro { padding: 31px 0 25px; }
      .intro-grid { grid-template-columns: 1fr; gap: 17px; }
      h1 { font-size: 30px; }
      .intro-aside { padding: 12px 15px; }
      .section { padding: 29px 0; }
      .section-head { align-items: start; flex-direction: column; gap: 7px; }
      .section-title { font-size: 21px; }
      .filter-bar { gap: 8px; padding: 12px; }
      .filter-label { width: 100%; }
      .filter-end { width: 100%; margin: 3px 0 0; }
      .content-row { grid-template-columns: 118px minmax(0, 1fr); gap: 12px; padding: 10px; }
      .content-thumb { aspect-ratio: 1 / 1; }
      .content-title { font-size: 14px; }
      .content-summary { margin-bottom: 7px; font-size: 11px; }
      .content-meta { gap: 9px; font-size: 10px; }
      .content-topline { margin-bottom: 4px; }
      .content-type { display: none; }
      .catalog-side { grid-template-columns: 1fr; }
      .side-panel + .side-panel { margin-top: 0; }
      .tips-grid { grid-template-columns: 1fr; gap: 10px; }
      .tip { min-height: 90px; }
      .article-list { grid-template-columns: 1fr; gap: 10px; }
      .article { min-height: 0; padding: 15px; }
      .cta-band { align-items: flex-start; flex-direction: column; padding: 21px; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 24px 17px; }
      .footer-brand { grid-column: 1 / -1; }
      .copyright { flex-direction: column; gap: 4px; }
    }
    @media (max-width: 390px) {
      .content-row { grid-template-columns: 96px minmax(0, 1fr); gap: 10px; }
      .content-summary { display: none; }
      .content-title { font-size: 13px; }
      .button { padding-inline: 13px; }
    }