/* roulang page: index */
:root {
            --ink: #172b3c;
            --muted: #63788b;
            --blue: #1769aa;
            --blue-dark: #105487;
            --blue-soft: #e8f2fa;
            --green: #218879;
            --green-soft: #e4f4ef;
            --warm: #c66b3d;
            --paper: #ffffff;
            --canvas: #f4f8fc;
            --line: #dfe8ef;
            --radius: 10px;
            --shadow: 0 8px 26px rgba(31, 64, 91, .075);
        }
        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; scroll-padding-top: 92px; }
        body {
            margin: 0;
            background: var(--canvas);
            color: var(--ink);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
            font-size: 15px;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a { color: inherit; text-decoration: none; }
        img { display: block; width: 100%; }
        button { font: inherit; }
        button, a { -webkit-tap-highlight-color: transparent; }
        :focus-visible { outline: 3px solid rgba(23, 105, 170, .38); outline-offset: 3px; }
        .container { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }
        .site-header {
            position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.96);
            border-bottom: 1px solid var(--line); backdrop-filter: blur(12px);
        }
        .nav-row { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
        .brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; font-size: 16px; font-weight: 800; }
        .brand-mark {
            width: 39px; height: 39px; display: grid; place-items: center; border-radius: 8px;
            color: white; background: var(--blue); font-size: 14px; letter-spacing: 0;
        }
        .brand-name { white-space: nowrap; }
        .nav-links { display: flex; align-items: center; gap: 26px; }
        .nav-links a { color: #52697b; font-size: 14px; font-weight: 650; transition: color .18s ease; }
        .nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--blue); }
        .nav-action, .button {
            display: inline-flex; align-items: center; justify-content: center; gap: 8px;
            min-height: 42px; padding: 0 17px; border: 1px solid transparent; border-radius: 7px;
            background: var(--blue); color: white; font-size: 14px; font-weight: 700;
            transition: background .18s ease, box-shadow .18s ease, border-color .18s ease;
        }
        .nav-action:hover, .button-primary:hover { background: var(--blue-dark); box-shadow: 0 5px 14px rgba(23,105,170,.18); }
        .button-secondary { color: var(--ink); background: #fff; border-color: var(--line); }
        .button-secondary:hover { background: #f0f6fa; border-color: #bbd0df; }
        .nav-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 7px; background: white; color: var(--ink); }
        .nav-toggle span, .nav-toggle::before, .nav-toggle::after {
            content: ""; display: block; width: 18px; height: 2px; margin: 4px auto; background: currentColor; transition: transform .2s;
        }
        .hero { padding: 48px 0 30px; }
        .hero-panel {
            position: relative; overflow: hidden; min-height: 458px; border-radius: 12px;
            background: #d8e8ef url("https://images.unsplash.com/photo-1539109136881-3be0616acf4b?auto=format&fit=crop&w=1800&q=88") center 38% / cover no-repeat;
            display: flex; align-items: flex-end;
        }
        .hero-panel::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(15,38,55,.82), rgba(15,38,55,.47) 52%, rgba(15,38,55,.08)); }
        .hero-copy { position: relative; z-index: 1; max-width: 760px; padding: 52px 58px; color: white; }
        .eyebrow { display: inline-flex; align-items: center; gap: 9px; margin-bottom: 15px; font-size: 12px; font-weight: 750; letter-spacing: 0; color: #e0f1f4; }
        .eyebrow::before { content: ""; width: 22px; height: 2px; background: #70d0be; }
        .hero h1 { margin: 0; font-size: 48px; line-height: 1.16; font-weight: 800; letter-spacing: 0; }
        .hero h1 span { color: #8fe0d0; }
        .hero-subtitle { margin: 12px 0 0; font-size: 19px; font-weight: 650; }
        .hero-description { max-width: 650px; margin: 13px 0 24px; color: rgba(255,255,255,.88); font-size: 15px; }
        .hero-actions { display: flex; gap: 10px; flex-wrap: wrap; }
        .hero .button-secondary { color: white; border-color: rgba(255,255,255,.45); background: rgba(255,255,255,.1); }
        .hero .button-secondary:hover { background: rgba(255,255,255,.2); }
        .hero-meta { display: flex; align-items: center; gap: 18px; margin-top: 23px; color: rgba(255,255,255,.82); font-size: 12px; }
        .hero-meta strong { color: white; font-size: 16px; margin-right: 4px; }
        .section { padding: 60px 0; }
        .section-white { background: white; }
        .section-muted { background: #edf4f8; }
        .section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 26px; }
        .section-title { margin: 0; font-size: 28px; line-height: 1.3; font-weight: 800; letter-spacing: 0; }
        .section-title .accent { color: var(--blue); }
        .section-intro { max-width: 740px; margin: 9px 0 0; color: var(--muted); font-size: 14px; }
        .text-link { display: inline-flex; align-items: center; gap: 7px; color: var(--blue); font-weight: 700; font-size: 13px; white-space: nowrap; }
        .text-link:hover { color: var(--blue-dark); text-decoration: underline; text-underline-offset: 4px; }
        .content-card, .feature-card, .topic-card, .news-item, .rank-panel, .guide-panel, .metric-panel, .faq-item {
            border: 1px solid var(--line); border-radius: var(--radius); background: white; box-shadow: var(--shadow);
        }
        .latest-layout { display: grid; grid-template-columns: 1.17fr 1fr; gap: 20px; }
        .feature-card { overflow: hidden; display: grid; grid-template-columns: 1.02fr .98fr; min-height: 100%; }
        .feature-image { min-height: 366px; height: 100%; object-fit: cover; }
        .feature-copy { display: flex; flex-direction: column; justify-content: center; padding: 27px; }
        .feature-copy h3 { margin: 13px 0 8px; font-size: 22px; line-height: 1.4; }
        .feature-copy p { margin: 0 0 17px; color: var(--muted); font-size: 14px; }
        .tag-row { display: flex; flex-wrap: wrap; gap: 7px; }
        .badge { display: inline-flex; align-items: center; min-height: 25px; padding: 2px 8px; border-radius: 5px; background: var(--blue-soft); color: var(--blue-dark); font-size: 11px; font-weight: 750; }
        .badge-green { color: #167161; background: var(--green-soft); }
        .rating { color: #975a2c; font-size: 13px; font-weight: 800; }
        .compact-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 13px; }
        .compact-card { display: grid; grid-template-columns: 92px minmax(0,1fr); gap: 12px; align-items: center; min-width: 0; padding: 9px; border: 1px solid var(--line); border-radius: 9px; background: white; }
        .compact-card img { width: 92px; height: 110px; object-fit: cover; border-radius: 6px; }
        .compact-card h3 { margin: 0 0 3px; font-size: 14px; line-height: 1.45; }
        .compact-card p { margin: 0 0 6px; color: var(--muted); font-size: 11px; }
        .card-meta { display: flex; align-items: center; justify-content: space-between; gap: 5px; }
        .content-grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 17px; }
        .poster-card { overflow: hidden; transition: box-shadow .18s ease, border-color .18s ease; }
        .poster-card:hover { border-color: #c4d8e7; box-shadow: 0 12px 28px rgba(31,64,91,.12); }
        .poster-image-wrap { position: relative; overflow: hidden; aspect-ratio: 4 / 3; background: #e3edf2; }
        .poster-image-wrap img { height: 100%; object-fit: cover; transition: transform .25s ease; }
        .poster-card:hover .poster-image-wrap img { transform: scale(1.025); }
        .poster-image-wrap .badge { position: absolute; top: 10px; left: 10px; }
        .poster-copy { padding: 13px 14px 14px; }
        .poster-copy h3 { margin: 0 0 3px; font-size: 15px; font-weight: 750; }
        .poster-copy p { margin: 0 0 9px; color: var(--muted); font-size: 12px; }
        .recommend-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 17px; }
        .recommend-card { display: grid; grid-template-columns: 122px minmax(0,1fr); overflow: hidden; min-height: 150px; }
        .recommend-card img { height: 100%; min-height: 150px; object-fit: cover; }
        .recommend-copy { padding: 14px; display: flex; flex-direction: column; justify-content: center; }
        .recommend-copy h3 { margin: 0 0 7px; font-size: 15px; }
        .recommend-copy p { margin: 0 0 9px; color: var(--muted); font-size: 12px; }
        .channel-grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); background: white; }
        .channel { min-height: 185px; padding: 22px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); transition: background .18s ease; }
        .channel:hover { background: #f5fafc; }
        .channel-num { color: var(--green); font-size: 12px; font-weight: 800; }
        .channel h3 { margin: 12px 0 7px; font-size: 17px; }
        .channel p { margin: 0; color: var(--muted); font-size: 13px; }
        .ranking-layout { display: grid; grid-template-columns: .74fr 1.26fr; gap: 38px; align-items: start; }
        .ranking-lead { padding: 12px 0; }
        .ranking-lead .overline { color: var(--green); font-size: 12px; font-weight: 800; }
        .ranking-lead h3 { margin: 11px 0 12px; font-size: 26px; line-height: 1.35; }
        .ranking-lead p { color: var(--muted); font-size: 14px; }
        .ranking-note { display: inline-flex; margin-top: 12px; padding: 9px 12px; border-left: 3px solid var(--green); background: #edf8f4; color: #376c62; font-size: 12px; }
        .rank-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 22px; }
        .rank-item { display: grid; grid-template-columns: 36px minmax(0,1fr) auto; align-items: center; gap: 10px; min-height: 58px; border-bottom: 1px solid var(--line); }
        .rank-number { color: #71869a; font-size: 14px; font-weight: 800; }
        .rank-item:nth-child(-n+3) .rank-number { color: var(--warm); }
        .rank-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; font-weight: 750; }
        .rank-sub { display: block; color: var(--muted); font-size: 10px; font-weight: 450; }
        .rank-score { text-align: right; color: var(--warm); font-size: 13px; font-weight: 800; }
        .guide-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center; }
        .guide-visual { min-height: 310px; display: grid; grid-template-columns: 1.12fr .88fr; gap: 12px; }
        .guide-visual img { height: 100%; min-height: 310px; object-fit: cover; border-radius: 9px; }
        .guide-visual aside { display: flex; flex-direction: column; gap: 12px; }
        .guide-visual aside img { min-height: 0; height: calc(50% - 6px); }
        .guide-list { margin: 20px 0 0; padding: 0; list-style: none; }
        .guide-list li { display: grid; grid-template-columns: 34px 1fr; gap: 12px; padding: 13px 0; border-bottom: 1px solid var(--line); }
        .guide-list strong { display: grid; place-items: center; width: 29px; height: 29px; border-radius: 50%; background: var(--blue-soft); color: var(--blue); font-size: 12px; }
        .guide-list span { color: var(--muted); font-size: 13px; }
        .topic-grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 14px; }
        .topic-card { padding: 21px; min-height: 192px; border-top: 3px solid var(--blue); }
        .topic-card:nth-child(2) { border-top-color: var(--green); }
        .topic-card:nth-child(3) { border-top-color: var(--warm); }
        .topic-card:nth-child(4) { border-top-color: #7297a8; }
        .topic-card .topic-index { color: var(--muted); font-size: 11px; font-weight: 800; }
        .topic-card h3 { margin: 13px 0 7px; font-size: 17px; }
        .topic-card p { margin: 0; color: var(--muted); font-size: 13px; }
        .editorial-layout { display: grid; grid-template-columns: 1fr .88fr; gap: 42px; }
        .editorial-main { display: grid; grid-template-columns: .85fr 1.15fr; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: white; }
        .editorial-main img { height: 100%; min-height: 290px; object-fit: cover; }
        .editorial-copy { padding: 25px; align-self: center; }
        .editorial-copy h3 { margin: 8px 0; font-size: 20px; line-height: 1.45; }
        .editorial-copy p { margin: 0; color: var(--muted); font-size: 13px; }
        .news-list { display: flex; flex-direction: column; gap: 9px; }
        .news-item { display: grid; grid-template-columns: 70px minmax(0,1fr); gap: 12px; align-items: center; padding: 8px; box-shadow: none; }
        .news-item img { width: 70px; height: 58px; object-fit: cover; border-radius: 5px; }
        .news-item h3 { margin: 0; font-size: 13px; line-height: 1.45; }
        .news-item time { color: var(--muted); font-size: 10px; }
        .update-band { display: grid; grid-template-columns: .9fr 1.1fr; gap: 44px; align-items: center; }
        .update-stamp { display: flex; gap: 17px; align-items: center; }
        .update-date { display: grid; place-items: center; width: 76px; height: 76px; border-radius: 9px; background: var(--green-soft); color: #197563; font-size: 13px; font-weight: 800; text-align: center; line-height: 1.3; }
        .update-stamp h3 { margin: 0; font-size: 19px; }
        .update-stamp p { margin: 5px 0 0; color: var(--muted); font-size: 13px; }
        .update-points { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
        .update-point { padding-left: 14px; border-left: 2px solid #a9d8cd; }
        .update-point strong { display: block; font-size: 13px; }
        .update-point span { color: var(--muted); font-size: 11px; }
        .faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
        .faq-item { padding: 16px 18px; box-shadow: none; }
        .faq-item summary { position: relative; cursor: pointer; list-style: none; padding-right: 24px; font-weight: 750; font-size: 14px; }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary::after { content: "+"; position: absolute; right: 0; top: -2px; color: var(--blue); font-size: 20px; font-weight: 500; }
        .faq-item[open] summary::after { content: "−"; }
        .faq-item p { margin: 11px 0 0; color: var(--muted); font-size: 13px; }
        .audience-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 40px; align-items: start; }
        .audience-copy { max-width: 370px; }
        .audience-copy p { color: var(--muted); font-size: 14px; }
        .audience-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; }
        .audience-item { padding: 16px 0; border-bottom: 1px solid var(--line); }
        .audience-item strong { display: block; margin-bottom: 4px; font-size: 14px; }
        .audience-item span { color: var(--muted); font-size: 12px; }
        .filter-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
        .filter-tags { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 20px; }
        .filter-tags span { padding: 7px 11px; border: 1px solid #d6e5ee; border-radius: 6px; background: white; color: #416178; font-size: 12px; font-weight: 650; }
        .filter-panel { padding: 24px; border-radius: 9px; background: #e9f3f7; }
        .filter-panel h3 { margin: 0 0 14px; font-size: 15px; }
        .filter-row { display: flex; justify-content: space-between; gap: 15px; padding: 10px 0; border-bottom: 1px solid #d4e2e9; font-size: 12px; }
        .filter-row span:first-child { color: var(--muted); }
        .filter-row strong { text-align: right; }
        .metrics { display: grid; grid-template-columns: repeat(4,1fr); gap: 1px; border: 1px solid var(--line); background: var(--line); }
        .metric { min-height: 132px; padding: 22px; background: white; }
        .metric strong { display: block; margin-bottom: 8px; color: var(--blue); font-size: 25px; line-height: 1.2; }
        .metric span { display: block; color: var(--muted); font-size: 12px; }
        .metric-note { margin: 13px 0 0; color: var(--muted); font-size: 11px; }
        .closing { padding: 55px 0; background: #e7f1f6; }
        .closing-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
        .closing h2 { margin: 0; font-size: 24px; }
        .closing p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }
        .site-footer { padding: 45px 0 0; background: #fff; border-top: 1px solid var(--line); }
        .footer-grid { display: grid; grid-template-columns: 1.35fr 1fr 1fr 1fr; gap: 34px; padding-bottom: 34px; }
        .footer-brand p { max-width: 310px; color: var(--muted); font-size: 12px; }
        .footer-col h3 { margin: 0 0 13px; font-size: 13px; }
        .footer-col a, .footer-col span { display: block; margin: 8px 0; color: var(--muted); font-size: 12px; }
        .footer-col a:hover { color: var(--blue); }
        .copyright { padding: 15px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
        @media (max-width: 1024px) {
            .container { width: min(100% - 38px, 920px); }
            .nav-links { gap: 16px; }
            .nav-action { display: none; }
            .latest-layout { grid-template-columns: 1fr; }
            .feature-card { grid-template-columns: .9fr 1.1fr; }
            .feature-image { min-height: 300px; }
            .content-grid { grid-template-columns: repeat(3,minmax(0,1fr)); }
            .topic-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
            .recommend-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
            .ranking-layout { grid-template-columns: .65fr 1.35fr; gap: 25px; }
            .editorial-layout { gap: 24px; }
            .footer-grid { grid-template-columns: 1.2fr 1fr 1fr; }
        }
        @media (max-width: 768px) {
            html { scroll-padding-top: 75px; }
            .container { width: min(100% - 32px, 620px); }
            .nav-row { min-height: 66px; gap: 12px; }
            .brand { font-size: 14px; }
            .brand-mark { width: 36px; height: 36px; }
            .nav-toggle { display: block; flex: 0 0 auto; cursor: pointer; }
            .nav-links {
                display: none; position: absolute; top: 65px; left: 0; right: 0; padding: 10px 20px 18px;
                flex-direction: column; align-items: stretch; gap: 0; background: white;
                border-bottom: 1px solid var(--line); box-shadow: 0 12px 18px rgba(31,64,91,.08);
            }
            .nav-links.is-open { display: flex; }
            .nav-links a { padding: 11px 4px; border-bottom: 1px solid #edf1f4; }
            .hero { padding: 22px 0 20px; }
            .hero-panel { min-height: 450px; background-position: 58% center; }
            .hero-panel::before { background: linear-gradient(0deg, rgba(15,38,55,.88), rgba(15,38,55,.38) 75%, rgba(15,38,55,.1)); }
            .hero-copy { padding: 32px 25px; }
            .hero h1 { font-size: 39px; }
            .hero-subtitle { font-size: 17px; }
            .hero-description { font-size: 14px; }
            .section { padding: 45px 0; }
            .section-title { font-size: 24px; }
            .section-head { align-items: flex-start; flex-direction: column; gap: 8px; margin-bottom: 20px; }
            .feature-card { grid-template-columns: 1fr; }
            .feature-image { height: 260px; min-height: 0; }
            .feature-copy { padding: 20px; }
            .compact-grid { gap: 9px; }
            .compact-card { grid-template-columns: 74px minmax(0,1fr); gap: 9px; padding: 7px; }
            .compact-card img { width: 74px; height: 94px; }
            .compact-card h3 { font-size: 12px; }
            .compact-card p { font-size: 10px; }
            .content-grid { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; }
            .recommend-grid { grid-template-columns: 1fr; }
            .recommend-card { grid-template-columns: 115px minmax(0,1fr); min-height: 128px; }
            .recommend-card img { min-height: 128px; }
            .channel-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
            .channel { min-height: 165px; padding: 17px; }
            .ranking-layout { grid-template-columns: 1fr; gap: 17px; }
            .ranking-lead h3 { font-size: 22px; }
            .rank-list { gap: 0 15px; }
            .guide-layout, .editorial-layout, .update-band, .audience-layout, .filter-layout { grid-template-columns: 1fr; gap: 25px; }
            .guide-visual { min-height: 255px; }
            .guide-visual img { min-height: 255px; }
            .editorial-main { grid-template-columns: .8fr 1.2fr; }
            .editorial-main img { min-height: 230px; }
            .update-points { gap: 8px; }
            .faq-list { grid-template-columns: 1fr; }
            .audience-list { gap: 0 18px; }
            .metrics { grid-template-columns: repeat(2,1fr); }
            .metric { min-height: 112px; padding: 17px; }
            .closing-inner { align-items: flex-start; flex-direction: column; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
        }
        @media (max-width: 520px) {
            .container { width: calc(100% - 28px); }
            .brand-name { white-space: normal; max-width: 230px; line-height: 1.25; }
            .hero-panel { min-height: 455px; border-radius: 9px; }
            .hero-copy { padding: 26px 20px; }
            .hero h1 { font-size: 34px; }
            .hero-meta { gap: 11px; flex-wrap: wrap; }
            .hero-meta strong { font-size: 14px; }
            .hero-actions .button { min-height: 40px; padding: 0 13px; font-size: 13px; }
            .compact-grid { grid-template-columns: 1fr; }
            .compact-card { grid-template-columns: 82px minmax(0,1fr); }
            .compact-card img { width: 82px; height: 94px; }
            .content-grid { gap: 9px; }
            .poster-image-wrap { aspect-ratio: 3 / 3.5; }
            .poster-copy { padding: 10px; }
            .poster-copy h3 { font-size: 13px; }
            .poster-copy p { font-size: 10px; }
            .poster-copy .badge { font-size: 9px; }
            .recommend-card { grid-template-columns: 98px minmax(0,1fr); }
            .recommend-card img { min-height: 120px; }
            .channel-grid { grid-template-columns: 1fr; }
            .channel { min-height: auto; }
            .rank-list { grid-template-columns: 1fr; }
            .guide-visual { min-height: 225px; }
            .guide-visual img { min-height: 225px; }
            .editorial-main { grid-template-columns: 1fr; }
            .editorial-main img { height: 210px; min-height: 0; }
            .update-points { grid-template-columns: 1fr; }
            .audience-list { grid-template-columns: 1fr; }
            .metrics { grid-template-columns: 1fr 1fr; }
            .metric strong { font-size: 22px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 20px 14px; }
            .footer-brand { grid-column: 1 / -1; }
            .section-title { font-size: 22px; }
        }
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
        }