/* roulang page: index */
:root {
            --ink: #16253d;
            --muted: #718096;
            --soft: #f4f7fb;
            --paper: #ffffff;
            --line: #e4eaf2;
            --blue: #2366d1;
            --blue-dark: #17499d;
            --cyan: #2ea7c9;
            --gold: #e4a83d;
            --navy: #102342;
            --radius-sm: 10px;
            --radius-md: 18px;
            --radius-lg: 28px;
            --shadow-sm: 0 8px 24px rgba(23, 50, 88, .07);
            --shadow-md: 0 18px 48px rgba(23, 50, 88, .13);
            --container: 1180px;
        }

        *, *::before, *::after { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            margin: 0;
            color: var(--ink);
            background: var(--paper);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            font-size: 16px;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        a { color: inherit; text-decoration: none; }
        button, input { font: inherit; }
        button { cursor: pointer; }
        img { display: block; max-width: 100%; }
        .container { width: min(var(--container), calc(100% - 48px)); margin: 0 auto; }
        .skip-link {
            position: absolute; left: -999px; top: 10px; z-index: 20;
            background: var(--blue); color: white; padding: 8px 14px; border-radius: 6px;
        }
        .skip-link:focus { left: 12px; }
        .site-header {
            position: sticky; top: 0; z-index: 10;
            background: rgba(255,255,255,.94);
            border-bottom: 1px solid rgba(228,234,242,.9);
            backdrop-filter: blur(14px);
        }
        .nav-wrap { min-height: 76px; display: flex; align-items: center; gap: 42px; }
        .brand { display: inline-flex; align-items: center; gap: 11px; min-width: max-content; }
        .brand-mark {
            width: 38px; height: 38px; border-radius: 12px;
            display: grid; place-items: center; color: white; font-size: 18px; font-weight: 800;
            background: var(--navy); box-shadow: 0 7px 15px rgba(16,35,66,.2);
        }
        .brand-name { font-size: 18px; font-weight: 800; letter-spacing: 0; }
        .nav-links { display: flex; align-items: center; gap: 28px; margin-right: auto; }
        .nav-links a { color: var(--muted); font-size: 15px; font-weight: 600; position: relative; padding: 25px 0; }
        .nav-links a::after {
            content: ""; position: absolute; left: 0; right: 0; bottom: 17px; height: 2px;
            background: var(--blue); transform: scaleX(0); transition: transform .2s ease;
        }
        .nav-links a:hover, .nav-links a.active { color: var(--blue-dark); }
        .nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }
        .location {
            color: var(--muted); font-size: 13px; padding-left: 20px;
            border-left: 1px solid var(--line); white-space: nowrap;
        }
        .location strong { color: var(--ink); display: block; font-size: 14px; }
        .menu-toggle { display: none; border: 0; background: transparent; color: var(--ink); font-size: 25px; }

        .hero { background: var(--soft); padding: 72px 0 78px; border-bottom: 1px solid var(--line); }
        .hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 64px; align-items: center; }
        .eyebrow, .section-kicker {
            display: inline-flex; align-items: center; gap: 8px; color: var(--blue);
            font-size: 13px; font-weight: 800; letter-spacing: .08em;
        }
        .eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--cyan); }
        h1 { max-width: 690px; margin: 17px 0 20px; font-size: clamp(38px, 5vw, 66px); line-height: 1.13; letter-spacing: 0; }
        .hero-copy { max-width: 620px; color: var(--muted); font-size: 18px; margin: 0 0 30px; }
        .actions { display: flex; flex-wrap: wrap; gap: 12px; }
        .btn {
            display: inline-flex; justify-content: center; align-items: center; gap: 8px;
            min-height: 48px; padding: 0 21px; border-radius: 9px; border: 1px solid transparent;
            font-weight: 750; transition: .2s ease; outline: none;
        }
        .btn:focus-visible, .faq-question:focus-visible, input:focus-visible { outline: 3px solid rgba(35,102,209,.25); outline-offset: 3px; }
        .btn-primary { color: #fff; background: var(--blue); box-shadow: 0 9px 18px rgba(35,102,209,.2); }
        .btn-primary:hover { background: var(--blue-dark); transform: translateY(-2px); }
        .btn-secondary { color: var(--ink); background: #fff; border-color: var(--line); }
        .btn-secondary:hover { border-color: var(--blue); color: var(--blue); }
        .hero-note { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 28px; color: var(--muted); font-size: 13px; }
        .hero-note span::before { content: "✓"; color: var(--cyan); font-weight: 900; margin-right: 7px; }

        .choice-panel {
            background: var(--navy); color: white; border-radius: var(--radius-lg); padding: 25px;
            box-shadow: var(--shadow-md); position: relative; overflow: hidden;
        }
        .choice-panel::before { content: ""; position: absolute; width: 180px; height: 180px; border: 1px solid rgba(255,255,255,.12); border-radius: 50%; right: -50px; top: -70px; }
        .panel-top { position: relative; display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
        .panel-top h2 { margin: 0; font-size: 20px; }
        .panel-top span { color: #b8c9e7; font-size: 13px; }
        .plan { position: relative; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14); border-radius: 14px; padding: 17px; margin-top: 11px; }
        .plan.recommended { background: #fff; color: var(--ink); border-color: var(--gold); box-shadow: 0 8px 20px rgba(0,0,0,.14); }
        .plan-line { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
        .plan-title { font-weight: 800; }
        .plan-price { font-size: 14px; color: #c2d3ef; }
        .recommended .plan-price { color: var(--blue); }
        .recommend-tag { background: var(--gold); color: #3c2b0e; padding: 3px 8px; border-radius: 5px; font-size: 11px; font-weight: 800; }
        .plan p { margin: 7px 0 0; color: #b8c9e7; font-size: 13px; line-height: 1.6; }
        .recommended p { color: var(--muted); }
        .panel-foot { position: relative; display: flex; justify-content: space-between; margin-top: 20px; color: #b8c9e7; font-size: 12px; }

        section { padding: 92px 0; }
        .section-head { max-width: 680px; margin-bottom: 38px; }
        .section-head h2 { margin: 9px 0 12px; font-size: clamp(28px, 3.2vw, 42px); line-height: 1.25; }
        .section-head p { margin: 0; color: var(--muted); font-size: 16px; }
        .directory { background: #fff; }
        .directory-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 15px; }
        .directory-card { border: 1px solid var(--line); border-radius: var(--radius-md); padding: 23px; transition: .2s; }
        .directory-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); border-color: #b9d0f1; }
        .directory-icon { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 11px; color: var(--blue); background: #eaf2ff; font-weight: 900; font-size: 18px; }
        .directory-card h3 { margin: 16px 0 6px; font-size: 18px; }
        .directory-card p { color: var(--muted); margin: 0; font-size: 14px; line-height: 1.65; }
        .value { background: var(--soft); }
        .value-layout { display: grid; grid-template-columns: .82fr 1.18fr; gap: 70px; align-items: start; }
        .value-intro h2 { font-size: 38px; line-height: 1.3; margin: 10px 0 16px; }
        .value-intro p { color: var(--muted); }
        .value-list { display: grid; gap: 16px; }
        .value-item { display: grid; grid-template-columns: 48px 1fr; gap: 17px; background: #fff; padding: 19px; border: 1px solid var(--line); border-radius: 14px; }
        .number { color: var(--blue); font-size: 20px; font-weight: 850; }
        .value-item h3 { margin: 0 0 3px; font-size: 17px; }
        .value-item p { margin: 0; color: var(--muted); font-size: 14px; }
        .topics { background: #fff; }
        .topic-grid { display: grid; grid-template-columns: 1.25fr .75fr .75fr; gap: 16px; }
        .topic { min-height: 180px; border-radius: var(--radius-md); padding: 24px; color: #fff; display: flex; flex-direction: column; justify-content: flex-end; overflow: hidden; position: relative; background: #2869bd; }
        .topic::after { content: ""; position: absolute; width: 120px; height: 120px; border: 1px solid rgba(255,255,255,.23); border-radius: 50%; right: -23px; top: -28px; }
        .topic:nth-child(2) { background: #2f8d9d; }
        .topic:nth-child(3) { background: #6179a8; }
        .topic:nth-child(4) { background: #1f4c82; grid-column: span 2; min-height: 145px; }
        .topic h3, .topic p { position: relative; z-index: 1; margin: 0; }
        .topic h3 { font-size: 21px; }
        .topic p { margin-top: 4px; color: rgba(255,255,255,.78); font-size: 13px; }
        .updates { background: var(--soft); }
        .updates-grid { display: grid; grid-template-columns: 1.5fr .75fr; gap: 25px; }
        .news-list, .recommend-box { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-md); }
        .news-list { padding: 8px 25px; }
        .news-row { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 18px 0; border-bottom: 1px solid var(--line); }
        .news-row:last-child { border-bottom: 0; }
        .news-row a { font-weight: 700; transition: color .2s; }
        .news-row a:hover { color: var(--blue); }
        .news-row small { color: var(--muted); white-space: nowrap; }
        .badge { display: inline-block; color: var(--blue); background: #eaf2ff; border-radius: 5px; padding: 2px 7px; font-size: 11px; margin-right: 9px; }
        .recommend-box { padding: 25px; }
        .recommend-box h3 { margin: 0 0 12px; font-size: 20px; }
        .recommend-box p { margin: 0 0 18px; color: var(--muted); font-size: 14px; }
        .mini-list { margin: 0; padding: 0; list-style: none; }
        .mini-list li { padding: 10px 0; border-top: 1px solid var(--line); font-size: 14px; }
        .mini-list li::before { content: "→"; color: var(--cyan); margin-right: 8px; }
        .proof { padding: 64px 0; background: var(--navy); color: #fff; }
        .proof-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 35px; }
        .proof-item { padding-right: 25px; border-right: 1px solid rgba(255,255,255,.17); }
        .proof-item:last-child { border: 0; }
        .proof-item strong { display: block; font-size: 34px; line-height: 1.2; color: #fff; }
        .proof-item span { display: block; margin-top: 7px; color: #b8c9e7; font-size: 14px; }
        .faq { background: #fff; }
        .faq-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 65px; }
        .faq-intro p { color: var(--muted); }
        .faq-item { border-top: 1px solid var(--line); }
        .faq-question { width: 100%; border: 0; background: transparent; text-align: left; padding: 19px 0; display: flex; justify-content: space-between; gap: 15px; color: var(--ink); font-weight: 750; }
        .faq-question span:last-child { color: var(--blue); font-size: 20px; transition: transform .2s; }
        .faq-answer { max-height: 0; overflow: hidden; color: var(--muted); font-size: 14px; transition: max-height .3s ease; }
        .faq-answer p { margin: 0 0 18px; }
        .faq-item.open .faq-answer { max-height: 150px; }
        .faq-item.open .faq-question span:last-child { transform: rotate(45deg); }
        .lead { padding: 74px 0; background: #eaf2ff; }
        .lead-box { display: flex; align-items: center; justify-content: space-between; gap: 35px; }
        .lead-box h2 { margin: 0 0 8px; font-size: 31px; }
        .lead-box p { color: var(--muted); margin: 0; max-width: 650px; }
        .site-footer { background: #0d1c34; color: #fff; padding: 46px 0 24px; }
        .footer-main { display: flex; justify-content: space-between; gap: 40px; padding-bottom: 36px; }
        .footer-brand p { max-width: 390px; color: #9fb1ce; font-size: 14px; margin: 14px 0 0; }
        .footer-links { display: flex; gap: 28px; align-items: flex-start; }
        .footer-links a { color: #b6c5dc; font-size: 14px; }
        .footer-links a:hover { color: #fff; }
        .copyright { padding-top: 20px; border-top: 1px solid rgba(255,255,255,.13); color: #8295b2; font-size: 12px; }
        @media (max-width: 1024px) {
            .hero-grid, .value-layout, .faq-grid { gap: 35px; }
            .directory-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .container { width: min(var(--container), calc(100% - 32px)); }
            .nav-wrap { min-height: 66px; justify-content: space-between; }
            .menu-toggle { display: block; }
            .nav-links { display: none; position: absolute; left: 16px; right: 16px; top: 61px; background: #fff; padding: 10px 18px; border: 1px solid var(--line); box-shadow: var(--shadow-md); border-radius: 12px; }
            .nav-links.open { display: block; }
            .nav-links a { display: block; padding: 9px 0; }
            .nav-links a::after { bottom: 4px; right: auto; width: 28px; }
            .location { display: none; }
            .hero { padding: 54px 0 58px; }
            .hero-grid, .value-layout, .updates-grid, .faq-grid { grid-template-columns: 1fr; }
            h1 { font-size: 42px; }
            section { padding: 64px 0; }
            .topic-grid { grid-template-columns: 1fr 1fr; }
            .topic:first-child { grid-column: span 2; }
            .topic:nth-child(4) { grid-column: span 2; }
            .proof { padding: 48px 0; }
            .proof-grid { gap: 18px; }
            .proof-item { padding-right: 14px; }
            .proof-item strong { font-size: 27px; }
            .lead-box, .footer-main { flex-direction: column; align-items: flex-start; }
        }
        @media (max-width: 520px) {
            .brand-name { font-size: 15px; }
            .brand-mark { width: 34px; height: 34px; }
            h1 { font-size: 35px; }
            .hero-copy { font-size: 16px; }
            .actions .btn { width: 100%; }
            .directory-grid, .topic-grid { grid-template-columns: 1fr; }
            .topic:first-child, .topic:nth-child(4) { grid-column: auto; }
            .topic { min-height: 150px; }
            .news-row { align-items: flex-start; flex-direction: column; gap: 5px; }
            .proof-grid { grid-template-columns: 1fr; }
            .proof-item { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.17); padding: 0 0 18px; }
            .proof-item:last-child { border: 0; padding-bottom: 0; }
            .footer-links { flex-wrap: wrap; gap: 14px 24px; }
        }