/* roulang page: index */
:root {
            --ink: #202b2a;
            --muted: #687572;
            --paper: #f5f4ef;
            --paper-deep: #e8ebe3;
            --white: #ffffff;
            --forest: #174b43;
            --leaf: #39745f;
            --mint: #b9d8c4;
            --coral: #d67a61;
            --line: #d9dfd8;
            --radius: 18px;
            --shadow: 0 16px 42px rgba(28, 52, 47, .10);
            --container: 1180px;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            color: var(--ink);
            background: var(--paper);
            font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            line-height: 1.7;
            letter-spacing: 0;
        }
        a { color: inherit; text-decoration: none; }
        img { display: block; width: 100%; object-fit: cover; }
        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(--leaf);
            font-size: 13px;
            font-weight: 800;
            letter-spacing: .08em;
            text-transform: uppercase;
        }
        .eyebrow::before {
            content: "";
            width: 24px;
            height: 2px;
            background: var(--coral);
        }
        h1, h2, h3 { line-height: 1.2; color: var(--ink); }
        h1 { font-size: clamp(42px, 6vw, 76px); max-width: 780px; }
        h2 { font-size: clamp(28px, 4vw, 46px); }
        h3 { font-size: 20px; }
        .section-head { max-width: 720px; margin-bottom: 34px; }
        .section-head h2 { margin: 12px 0 14px; }
        .section-head p { color: var(--muted); font-size: 16px; }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 20;
            background: rgba(245,244,239,.92);
            border-bottom: 1px solid rgba(217,223,216,.9);
            backdrop-filter: blur(16px);
        }
        .nav-wrap {
            min-height: 76px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 28px;
        }
        .brand {
            display: 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(--forest);
            border-radius: 11px;
            font-size: 17px;
        }
        .brand-name { font-size: 16px; }
        .nav-list { display: flex; align-items: center; gap: 24px; list-style: none; }
        .nav-list a {
            color: var(--muted);
            font-size: 14px;
            font-weight: 700;
            transition: color .2s ease;
        }
        .nav-list a:hover, .nav-list a.active { color: var(--forest); }
        .nav-button {
            padding: 10px 17px;
            color: var(--white) !important;
            background: var(--forest);
            border-radius: 10px;
        }
        .nav-button:hover { background: var(--leaf); }

        .hero {
            min-height: 650px;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            background:
                linear-gradient(90deg, rgba(245,244,239,.98) 0%, rgba(245,244,239,.88) 46%, rgba(245,244,239,.22) 100%),
                url("https://images.unsplash.com/photo-1485846234645-a62644f84728?auto=format&fit=crop&w=1900&q=85") center/cover;
        }
        .hero::after {
            content: "";
            position: absolute;
            width: 310px;
            height: 310px;
            right: 9%;
            bottom: -130px;
            border-radius: 50%;
            background: rgba(185,216,196,.54);
            filter: blur(5px);
        }
        .hero-content { position: relative; z-index: 1; padding: 92px 0 110px; }
        .hero h1 { margin: 18px 0 22px; }
        .hero h1 span { color: var(--coral); }
        .hero-lead { max-width: 650px; color: #53635f; font-size: 18px; }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
        .button {
            border: 1px solid transparent;
            border-radius: 10px;
            padding: 13px 20px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 800;
            transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
        }
        .button:hover { transform: translateY(-2px); box-shadow: 0 9px 20px rgba(23,75,67,.16); }
        .button:focus-visible, input:focus-visible, a:focus-visible { outline: 3px solid rgba(214,122,97,.45); outline-offset: 3px; }
        .button-primary { color: var(--white); background: var(--forest); }
        .button-secondary { color: var(--forest); background: rgba(255,255,255,.7); border-color: var(--line); }

        main section { padding: 92px 0; }
        .stats-band { padding: 28px 0; background: var(--forest); color: var(--white); }
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
        .stat { padding: 10px 20px; border-left: 1px solid rgba(255,255,255,.25); }
        .stat:first-child { border-left: 0; }
        .stat strong { display: block; font-size: 31px; color: var(--mint); }
        .stat span { color: rgba(255,255,255,.72); font-size: 14px; }

        .matrix { background: var(--white); }
        .matrix-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
        .matrix-item {
            min-height: 210px;
            padding: 26px;
            border: 1px solid var(--line);
            border-radius: var(--radius);
            background: #fbfcf9;
            transition: transform .2s ease, box-shadow .2s ease;
        }
        .matrix-item:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
        .icon {
            width: 42px; height: 42px;
            display: grid; place-items: center;
            margin-bottom: 22px;
            border-radius: 12px;
            color: var(--forest);
            background: var(--mint);
            font-weight: 900;
        }
        .matrix-item p, .feature p, .timeline p, .faq-answer { color: var(--muted); font-size: 14px; margin-top: 10px; }

        .features { background: var(--paper-deep); }
        .feature-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 56px; align-items: center; }
        .feature-image { min-height: 410px; border-radius: 24px; overflow: hidden; box-shadow: var(--shadow); }
        .feature-image img { height: 100%; }
        .feature-list { display: grid; gap: 18px; }
        .feature { display: grid; grid-template-columns: 44px 1fr; gap: 16px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
        .feature:last-child { border-bottom: 0; }
        .feature .icon { margin: 0; }

        .compare { background: var(--white); }
        .compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
        .compare-panel { padding: 30px; border-radius: var(--radius); border: 1px solid var(--line); }
        .compare-panel.old { background: #faf4f0; }
        .compare-panel.new { background: #edf6ef; border-color: var(--mint); }
        .compare-panel h3 { margin-bottom: 18px; }
        .compare-panel ul { list-style: none; display: grid; gap: 13px; color: var(--muted); font-size: 14px; }
        .compare-panel li::before { content: "•"; margin-right: 9px; color: var(--coral); font-weight: 900; }
        .compare-panel.new li::before { content: "✓"; color: var(--leaf); }

        .timeline-section { background: var(--paper); }
        .timeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
        .timeline-item { position: relative; padding: 0 24px 0 0; }
        .timeline-item:not(:last-child)::after {
            content: "";
            position: absolute;
            top: 16px;
            left: 36px;
            right: 0;
            height: 1px;
            background: var(--line);
        }
        .timeline-number {
            position: relative;
            z-index: 1;
            width: 34px; height: 34px;
            display: grid; place-items: center;
            margin-bottom: 22px;
            color: var(--white);
            background: var(--forest);
            border-radius: 50%;
            font-weight: 900;
        }

        .news { background: var(--white); }
        .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
        .news-card { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; transition: transform .2s ease, box-shadow .2s ease; }
        .news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
        .news-card img { height: 170px; }
        .news-body { padding: 22px; }
        .news-date { color: var(--coral); font-size: 12px; font-weight: 800; }
        .news-body h3 { margin-top: 8px; font-size: 18px; }
        .news-body p { margin-top: 9px; color: var(--muted); font-size: 14px; }

        .trust { background: var(--forest); color: var(--white); }
        .trust .section-head h2, .trust .section-head p { color: var(--white); }
        .trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
        .trust-card { padding: 26px; border: 1px solid rgba(255,255,255,.2); border-radius: var(--radius); background: rgba(255,255,255,.08); }
        .trust-card h3 { color: var(--mint); }
        .trust-card p { margin-top: 10px; color: rgba(255,255,255,.72); font-size: 14px; }

        .faq { background: var(--paper-deep); }
        .faq-list { max-width: 880px; display: grid; gap: 10px; }
        details { padding: 20px 22px; background: var(--white); border: 1px solid var(--line); border-radius: 13px; }
        summary { cursor: pointer; font-weight: 800; color: var(--ink); }
        .faq-answer { padding-top: 12px; }

        .closing { background: var(--coral); color: var(--white); }
        .closing-inner { display: flex; align-items: center; justify-content: space-between; gap: 28px; }
        .closing h2 { color: var(--white); max-width: 680px; }
        .closing p { margin-top: 10px; color: rgba(255,255,255,.82); }
        .closing .button { background: var(--white); color: var(--forest); white-space: nowrap; }

        footer { padding: 62px 0 24px; color: var(--muted); background: #172d2a; }
        .footer-grid { display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 40px; padding-bottom: 45px; }
        footer .brand { color: var(--white); }
        .footer-intro { max-width: 290px; margin-top: 18px; font-size: 14px; }
        footer h3 { margin-bottom: 15px; color: var(--mint); font-size: 15px; }
        footer ul { list-style: none; display: grid; gap: 8px; font-size: 14px; }
        footer li 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) {
            .nav-list { gap: 14px; }
            .matrix-grid { grid-template-columns: repeat(2, 1fr); }
            .feature-layout { gap: 32px; }
        }
        @media (max-width: 768px) {
            .container { width: min(var(--container), calc(100% - 32px)); }
            .nav-wrap { min-height: 68px; }
            .brand-name { font-size: 14px; max-width: 180px; white-space: normal; line-height: 1.25; }
            .nav-list { overflow-x: auto; max-width: 55vw; padding-bottom: 4px; }
            .nav-list a { white-space: nowrap; font-size: 13px; }
            .nav-button { display: none; }
            .hero { min-height: 600px; background-position: 64% center; }
            .hero-content { padding: 74px 0 95px; }
            .hero-lead { font-size: 16px; }
            main section { padding: 68px 0; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .stat:nth-child(3) { border-left: 0; }
            .feature-layout, .compare-grid { grid-template-columns: 1fr; }
            .feature-image { min-height: 280px; }
            .timeline { grid-template-columns: repeat(2, 1fr); gap: 28px 0; }
            .timeline-item:not(:last-child)::after { display: none; }
            .news-grid { grid-template-columns: 1fr 1fr; }
            .trust-grid { grid-template-columns: 1fr; }
            .closing-inner { align-items: flex-start; flex-direction: column; }
            .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
            .footer-grid > :first-child { grid-column: 1 / -1; }
        }
        @media (max-width: 520px) {
            h1 { font-size: 42px; }
            .hero-actions { align-items: stretch; flex-direction: column; }
            .hero-actions .button { width: 100%; }
            .stats-grid, .matrix-grid, .news-grid, .timeline { grid-template-columns: 1fr; }
            .stat { border-left: 0; border-bottom: 1px solid rgba(255,255,255,.2); padding: 14px 0; }
            .stat:last-child { border-bottom: 0; }
            .timeline-item { padding-right: 0; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px 18px; }
            .footer-grid > :first-child { grid-column: 1 / -1; }
        }