/* roulang page: index */
:root {
            --ink: #17252b;
            --muted: #68767a;
            --paper: #f4f1ea;
            --white: #fffdf9;
            --line: #d9ded9;
            --teal: #116b68;
            --teal-dark: #0b4e4d;
            --coral: #d9684c;
            --yellow: #f2c14e;
            --shadow: 0 18px 45px rgba(25, 53, 55, .10);
            --radius: 18px;
            --container: 1180px;
        }

        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            margin: 0;
            color: var(--ink);
            background: var(--paper);
            font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a { color: inherit; text-decoration: none; }
        img { display: block; max-width: 100%; }
        button, input { font: inherit; }
        button { cursor: pointer; }
        .container { width: min(var(--container), calc(100% - 48px)); margin: 0 auto; }
        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--teal);
            font-size: 12px;
            font-weight: 800;
            letter-spacing: 1.6px;
            text-transform: uppercase;
        }
        .eyebrow::before {
            content: "";
            width: 28px;
            height: 2px;
            background: var(--coral);
        }
        .section-head {
            display: flex;
            align-items: end;
            justify-content: space-between;
            gap: 28px;
            margin-bottom: 34px;
        }
        .section-head h2 {
            max-width: 680px;
            margin: 9px 0 0;
            font-size: clamp(28px, 4vw, 44px);
            line-height: 1.18;
            letter-spacing: -1px;
        }
        .section-head p {
            max-width: 460px;
            margin: 0;
            color: var(--muted);
            font-size: 15px;
        }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 20;
            background: rgba(244, 241, 234, .93);
            border-bottom: 1px solid rgba(217, 222, 217, .85);
            backdrop-filter: blur(16px);
        }
        .nav-wrap {
            min-height: 76px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
        }
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            font-weight: 900;
            white-space: nowrap;
        }
        .brand-mark {
            width: 38px;
            height: 38px;
            display: grid;
            place-items: center;
            color: var(--white);
            background: var(--teal);
            border-radius: 11px;
            font-size: 18px;
            box-shadow: 4px 4px 0 var(--yellow);
        }
        .brand-name { font-size: 15px; }
        .nav-links { display: flex; align-items: center; gap: 26px; }
        .nav-links a {
            position: relative;
            color: #526267;
            font-size: 14px;
            font-weight: 700;
            transition: color .2s ease;
        }
        .nav-links a::after {
            content: "";
            position: absolute;
            left: 0;
            right: 100%;
            bottom: -8px;
            height: 2px;
            background: var(--coral);
            transition: right .2s ease;
        }
        .nav-links a:hover, .nav-links a.active { color: var(--teal-dark); }
        .nav-links a:hover::after, .nav-links a.active::after { right: 0; }
        .nav-cta {
            padding: 10px 17px;
            color: var(--white) !important;
            background: var(--coral);
            border-radius: 10px;
        }
        .nav-cta::after { display: none; }
        .menu-btn {
            display: none;
            width: 42px;
            height: 38px;
            border: 1px solid var(--line);
            border-radius: 9px;
            color: var(--teal);
            background: transparent;
            font-size: 20px;
        }
        .hero {
            position: relative;
            min-height: 680px;
            display: flex;
            align-items: center;
            overflow: hidden;
            color: var(--white);
            background: var(--teal-dark);
        }
        .hero::before {
            content: "";
            position: absolute;
            inset: 0;
            opacity: .38;
            background: linear-gradient(90deg, rgba(5, 37, 39, .94) 0%, rgba(5, 37, 39, .66) 48%, rgba(5, 37, 39, .20) 100%), url("https://images.unsplash.com/photo-1500534623283-312aade485b7?auto=format&fit=crop&w=1800&q=85") center/cover;
        }
        .hero::after {
            content: "";
            position: absolute;
            width: 420px;
            height: 420px;
            right: 7%;
            top: 15%;
            border: 1px solid rgba(242, 193, 78, .55);
            border-radius: 50%;
            box-shadow: 0 0 0 28px rgba(242, 193, 78, .07), 0 0 0 56px rgba(242, 193, 78, .04);
        }
        .hero-inner { position: relative; z-index: 1; padding: 110px 0 124px; }
        .hero-copy { max-width: 700px; }
        .hero .eyebrow { color: var(--yellow); }
        .hero h1 {
            margin: 20px 0 18px;
            max-width: 690px;
            font-size: clamp(38px, 6vw, 74px);
            line-height: 1.08;
            letter-spacing: -3px;
        }
        .hero h1 strong { color: var(--yellow); font-weight: inherit; }
        .hero-lead {
            max-width: 680px;
            margin: 0;
            color: rgba(255,255,255,.84);
            font-size: 17px;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 9px;
            min-height: 48px;
            padding: 0 20px;
            border: 1px solid transparent;
            border-radius: 11px;
            font-size: 14px;
            font-weight: 800;
            transition: transform .2s, box-shadow .2s, background .2s;
        }
        .btn:hover { transform: translateY(-3px); box-shadow: 0 9px 20px rgba(0,0,0,.13); }
        .btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible {
            outline: 3px solid rgba(242,193,78,.8);
            outline-offset: 3px;
        }
        .btn-primary { color: var(--teal-dark); background: var(--yellow); }
        .btn-secondary { color: var(--white); border-color: rgba(255,255,255,.38); background: rgba(255,255,255,.08); }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 26px;
            margin-top: 52px;
        }
        .stat { padding-left: 15px; border-left: 2px solid var(--coral); }
        .stat b { display: block; font-size: 22px; line-height: 1.2; }
        .stat span { color: rgba(255,255,255,.65); font-size: 12px; }
        section { padding: 96px 0; }
        .section-light { background: var(--white); }
        .section-dark { color: var(--white); background: #173d40; }
        .section-dark .section-head p { color: rgba(255,255,255,.66); }
        .collection-grid {
            display: grid;
            grid-template-columns: 1.3fr .85fr .85fr;
            gap: 18px;
        }
        .feature-card, .story-card, .topic-card, .quote-card, .news-item, .rank-item {
            overflow: hidden;
            border: 1px solid var(--line);
            background: var(--white);
            border-radius: var(--radius);
            transition: transform .25s, box-shadow .25s, border-color .25s;
        }
        .feature-card:hover, .story-card:hover, .topic-card:hover, .quote-card:hover, .news-item:hover {
            border-color: rgba(17,107,104,.4);
            box-shadow: var(--shadow);
            transform: translateY(-5px);
        }
        .feature-card:first-child { grid-row: span 2; }
        .card-image { position: relative; overflow: hidden; background: #dbe4df; }
        .feature-card:first-child .card-image { height: 370px; }
        .feature-card:not(:first-child) .card-image { height: 178px; }
        .card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
        .feature-card:hover img, .story-card:hover img, .news-item:hover img { transform: scale(1.05); }
        .card-body { padding: 20px; }
        .card-meta { display: flex; justify-content: space-between; gap: 12px; color: var(--muted); font-size: 12px; }
        .tag {
            display: inline-flex;
            width: fit-content;
            padding: 4px 9px;
            color: var(--teal-dark);
            background: #e3efeb;
            border-radius: 6px;
            font-size: 11px;
            font-weight: 800;
        }
        .card-body h3 { margin: 12px 0 8px; font-size: 20px; line-height: 1.35; }
        .card-body p { margin: 0; color: var(--muted); font-size: 14px; }
        .feature-card:first-child .card-body h3 { font-size: 27px; }
        .triple-grid, .topic-grid, .quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
        .story-card .card-image { height: 210px; }
        .story-card .card-body { min-height: 172px; }
        .signal-section { background: #e8eee9; }
        .signal-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
        .signal {
            min-height: 210px;
            padding: 28px;
            border-top: 4px solid var(--coral);
            background: var(--white);
            border-radius: 14px;
        }
        .signal:nth-child(2) { border-color: var(--teal); }
        .signal:nth-child(3) { border-color: var(--yellow); }
        .signal-icon {
            width: 42px; height: 42px; display: grid; place-items: center;
            margin-bottom: 18px; color: var(--teal-dark);
            background: #e3efeb; border-radius: 10px; font-weight: 900;
        }
        .signal h3 { margin: 0 0 9px; font-size: 20px; }
        .signal p { margin: 0; color: var(--muted); font-size: 14px; }
        .topic-card { padding: 25px; background: transparent; }
        .topic-card h3 { margin: 17px 0 8px; font-size: 21px; }
        .topic-card p { margin: 0; color: var(--muted); font-size: 14px; }
        .topic-number { color: var(--coral); font-size: 13px; font-weight: 900; }
        .rank-layout { display: grid; grid-template-columns: 1fr .7fr; gap: 58px; align-items: start; }
        .rank-list { display: grid; gap: 9px; }
        .rank-item {
            display: grid;
            grid-template-columns: 45px 1fr auto auto;
            align-items: center;
            gap: 15px;
            padding: 15px 18px;
            border-color: rgba(255,255,255,.12);
            background: rgba(255,255,255,.06);
        }
        .rank-item:hover { background: rgba(255,255,255,.12); transform: translateX(4px); }
        .rank-no { color: var(--yellow); font-size: 20px; font-weight: 900; }
        .rank-title { font-weight: 800; }
        .rank-type { color: rgba(255,255,255,.56); font-size: 12px; }
        .rank-score { color: var(--yellow); font-size: 14px; font-weight: 900; }
        .rank-intro { padding: 29px; border-left: 3px solid var(--coral); background: rgba(255,255,255,.06); }
        .rank-intro h3 { margin: 0 0 13px; font-size: 27px; }
        .rank-intro p { margin: 0; color: rgba(255,255,255,.68); font-size: 14px; }
        .news-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
        .news-item { display: grid; grid-template-columns: 142px 1fr; }
        .news-item img { width: 142px; height: 142px; object-fit: cover; }
        .news-copy { padding: 16px 18px; }
        .news-copy time { color: var(--coral); font-size: 12px; font-weight: 800; }
        .news-copy h3 { margin: 7px 0 5px; font-size: 17px; line-height: 1.4; }
        .news-copy p { margin: 0; color: var(--muted); font-size: 13px; }
        .quotes { background: #f0e8d9; }
        .quote-card { padding: 25px; background: rgba(255,253,249,.8); }
        .quote-mark { color: var(--coral); font-size: 42px; line-height: .8; }
        .quote-card p { min-height: 76px; margin: 15px 0 20px; font-size: 15px; }
        .quote-user { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 12px; font-weight: 800; }
        .avatar { width: 32px; height: 32px; display: grid; place-items: center; color: var(--white); background: var(--teal); border-radius: 50%; }
        .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
        details { border-bottom: 1px solid var(--line); }
        summary {
            padding: 21px 0;
            list-style: none;
            cursor: pointer;
            font-weight: 800;
            display: flex;
            justify-content: space-between;
            gap: 20px;
        }
        summary::-webkit-details-marker { display: none; }
        summary::after { content: "+"; color: var(--coral); font-size: 22px; line-height: 1; }
        details[open] summary::after { content: "−"; }
        details p { margin: -5px 0 21px; color: var(--muted); font-size: 14px; }
        .closing {
            padding: 68px 0;
            color: var(--white);
            background: var(--coral);
        }
        .closing-inner { display: flex; align-items: center; justify-content: space-between; gap: 28px; }
        .closing h2 { max-width: 650px; margin: 0 0 10px; font-size: clamp(28px, 4vw, 45px); line-height: 1.18; }
        .closing p { max-width: 620px; margin: 0; color: rgba(255,255,255,.8); }
        .closing .btn-primary { color: var(--coral); background: var(--white); }
        footer { padding: 62px 0 25px; color: rgba(255,255,255,.72); background: #102b2d; }
        .footer-grid { display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 34px; padding-bottom: 45px; }
        footer .brand { color: var(--white); }
        .footer-desc { max-width: 290px; margin: 20px 0 0; font-size: 13px; }
        footer h3 { margin: 0 0 15px; color: var(--yellow); font-size: 14px; }
        footer a { display: block; margin: 8px 0; color: rgba(255,255,255,.68); font-size: 13px; }
        footer a:hover { color: var(--white); }
        .copyright { padding-top: 20px; border-top: 1px solid rgba(255,255,255,.14); font-size: 12px; }
        @media (max-width: 1024px) {
            .container { width: min(var(--container), calc(100% - 36px)); }
            .nav-links { gap: 15px; }
            .collection-grid { grid-template-columns: 1fr 1fr; }
            .feature-card:first-child { grid-row: auto; grid-column: span 2; }
            .feature-card:first-child .card-image { height: 310px; }
            .rank-layout { grid-template-columns: 1fr; gap: 30px; }
        }
        @media (max-width: 768px) {
            section { padding: 70px 0; }
            .menu-btn { display: block; }
            .nav-links {
                position: absolute;
                top: 76px; left: 18px; right: 18px;
                display: none;
                padding: 17px;
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                background: var(--white);
                border: 1px solid var(--line);
                border-radius: 13px;
                box-shadow: var(--shadow);
            }
            .nav-links.open { display: flex; }
            .nav-links a { padding: 12px 8px; }
            .nav-cta { text-align: center; }
            .hero { min-height: 620px; }
            .hero::after { right: -160px; top: 16%; }
            .hero-inner { padding: 86px 0 90px; }
            .hero h1 { letter-spacing: -1.5px; }
            .section-head { display: block; }
            .section-head p { margin-top: 16px; }
            .triple-grid, .signal-grid, .topic-grid, .quote-grid { grid-template-columns: 1fr 1fr; }
            .news-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .closing-inner { display: block; }
            .closing .btn { margin-top: 24px; }
        }
        @media (max-width: 520px) {
            .brand-name { max-width: 180px; overflow: hidden; text-overflow: ellipsis; }
            .hero-lead { font-size: 15px; }
            .hero-stats { gap: 17px; margin-top: 35px; }
            .collection-grid, .triple-grid, .signal-grid, .topic-grid, .quote-grid, .faq-grid { grid-template-columns: 1fr; }
            .feature-card:first-child { grid-column: auto; }
            .feature-card:first-child .card-image, .feature-card:not(:first-child) .card-image { height: 215px; }
            .rank-item { grid-template-columns: 32px 1fr auto; gap: 10px; }
            .rank-type { display: block; }
            .rank-score { grid-column: 3; grid-row: 1; }
            .news-item { grid-template-columns: 108px 1fr; }
            .news-item img { width: 108px; height: 138px; }
            .news-copy { padding: 13px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 25px 15px; }
            .footer-grid > :first-child { grid-column: span 2; }
        }