/* roulang page: index */
:root {
            --ink: #10213f;
            --muted: #61708b;
            --blue: #2563eb;
            --blue-dark: #1748b6;
            --cyan: #11b7d8;
            --soft: #f4f8ff;
            --line: #e3ebf7;
            --card: #ffffff;
            --shadow: 0 18px 55px rgba(24, 62, 122, .10);
            --shadow-lg: 0 25px 75px rgba(14, 46, 101, .16);
            --radius: 24px;
        }
        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            margin: 0;
            color: var(--ink);
            background: #fff;
            font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        a { color: inherit; text-decoration: none; }
        img { max-width: 100%; display: block; }
        button, input { font: inherit; }
        button { cursor: pointer; }
        :focus-visible { outline: 3px solid rgba(37, 99, 235, .35); outline-offset: 3px; }
        .container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
        .section { padding: 96px 0; }
        .section-soft { background: var(--soft); }
        .section-blue { background: #0b1730; color: #fff; }
        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 7px 13px;
            border-radius: 999px;
            color: var(--blue);
            background: #eaf2ff;
            font-size: 13px;
            font-weight: 800;
            letter-spacing: .04em;
        }
        .eyebrow.light { color: #a9dcff; background: rgba(112, 188, 255, .12); }
        .section-title {
            max-width: 700px;
            margin: 16px 0 12px;
            font-size: clamp(30px, 4vw, 48px);
            line-height: 1.18;
            letter-spacing: -.045em;
            font-weight: 850;
        }
        .section-desc {
            max-width: 720px;
            color: var(--muted);
            font-size: 16px;
        }
        .section-blue .section-desc { color: #aec0dd; }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            border-bottom: 1px solid rgba(218, 228, 243, .8);
            background: rgba(255, 255, 255, .90);
            backdrop-filter: blur(18px);
        }
        .nav-shell {
            min-height: 78px;
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            align-items: center;
            gap: 20px;
        }
        .brand {
            justify-self: center;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 19px;
            font-weight: 900;
            letter-spacing: -.04em;
        }
        .brand-mark {
            width: 34px;
            height: 34px;
            display: grid;
            place-items: center;
            border-radius: 11px;
            color: white;
            background: linear-gradient(135deg, #2563eb, #13b4d4);
            box-shadow: 0 8px 20px rgba(37, 99, 235, .28);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 21px;
            color: #52627d;
            font-size: 14px;
            font-weight: 700;
        }
        .nav-links.left { justify-content: flex-end; }
        .nav-links.right { justify-content: flex-start; }
        .nav-links a { transition: color .2s ease; }
        .nav-links a:hover, .nav-links a.active { color: var(--blue); }
        .nav-action {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 16px;
            border-radius: 12px;
            color: #fff !important;
            background: var(--blue);
            box-shadow: 0 10px 22px rgba(37, 99, 235, .22);
        }
        .nav-action:hover { background: var(--blue-dark); transform: translateY(-1px); }
        .menu-toggle { display: none; border: 0; background: transparent; color: var(--ink); font-size: 22px; }
        .hero {
            position: relative;
            overflow: hidden;
            padding: 82px 0 72px;
            background:
                radial-gradient(circle at 80% 10%, rgba(71, 145, 255, .14), transparent 34%),
                linear-gradient(180deg, #f8fbff 0%, #fff 100%);
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1.03fr .97fr;
            align-items: center;
            gap: 64px;
        }
        .hero h1 {
            margin: 18px 0 20px;
            max-width: 680px;
            font-size: clamp(42px, 6vw, 76px);
            line-height: 1.06;
            letter-spacing: -.065em;
            font-weight: 900;
        }
        .hero h1 span { color: var(--blue); }
        .hero-copy {
            max-width: 650px;
            color: #576983;
            font-size: 17px;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 30px; }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 9px;
            min-height: 48px;
            padding: 0 20px;
            border: 1px solid transparent;
            border-radius: 13px;
            font-weight: 800;
            transition: .22s ease;
        }
        .btn-primary { color: white; background: var(--blue); box-shadow: 0 14px 28px rgba(37, 99, 235, .22); }
        .btn-primary:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 18px 30px rgba(37, 99, 235, .28); }
        .btn-secondary { color: var(--ink); background: white; border-color: var(--line); }
        .btn-secondary:hover { border-color: #9dbcf5; color: var(--blue); transform: translateY(-2px); }
        .hero-dashboard {
            position: relative;
            padding: 17px;
            border: 1px solid #dce8fa;
            border-radius: 29px;
            background: rgba(255,255,255,.82);
            box-shadow: var(--shadow-lg);
        }
        .hero-dashboard img { border-radius: 18px; width: 100%; }
        .signal-card {
            position: absolute;
            right: -25px;
            bottom: 30px;
            width: 190px;
            padding: 15px;
            border: 1px solid #e4edf9;
            border-radius: 17px;
            background: rgba(255,255,255,.96);
            box-shadow: var(--shadow);
        }
        .signal-card strong { display: block; font-size: 24px; color: #16a36d; line-height: 1.2; }
        .signal-card small { color: var(--muted); font-size: 12px; }
        .metric-strip {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            margin-top: 58px;
            border: 1px solid var(--line);
            border-radius: 20px;
            background: #fff;
            box-shadow: var(--shadow);
        }
        .metric { padding: 20px 24px; border-right: 1px solid var(--line); }
        .metric:last-child { border-right: 0; }
        .metric strong { display: block; color: var(--ink); font-size: 28px; line-height: 1.2; }
        .metric span { color: var(--muted); font-size: 13px; }
        .feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 42px; }
        .feature-card, .news-card, .proof-card, .partner-card, .plan-card {
            border: 1px solid var(--line);
            border-radius: var(--radius);
            background: var(--card);
            box-shadow: 0 8px 28px rgba(28, 67, 128, .06);
            transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
        }
        .feature-card:hover, .news-card:hover, .proof-card:hover, .partner-card:hover, .plan-card:hover {
            transform: translateY(-6px);
            border-color: #b7cff9;
            box-shadow: var(--shadow);
        }
        .feature-card { padding: 28px; }
        .icon-box {
            width: 48px;
            height: 48px;
            display: grid;
            place-items: center;
            border-radius: 15px;
            color: var(--blue);
            background: #eaf2ff;
            font-size: 20px;
        }
        .feature-card h3, .proof-card h3, .news-card h3 { margin: 20px 0 8px; font-size: 20px; letter-spacing: -.025em; }
        .feature-card p, .proof-card p, .news-card p { margin: 0; color: var(--muted); font-size: 14px; }
        .matrix {
            display: grid;
            grid-template-columns: 1.1fr .9fr;
            gap: 54px;
            align-items: center;
        }
        .matrix-list { display: grid; gap: 13px; margin-top: 28px; }
        .matrix-item {
            display: flex;
            gap: 15px;
            align-items: flex-start;
            padding: 17px 18px;
            border: 1px solid var(--line);
            border-radius: 17px;
            background: #fff;
        }
        .matrix-item i { margin-top: 4px; color: var(--blue); }
        .matrix-item strong { display: block; font-size: 16px; }
        .matrix-item span { display: block; color: var(--muted); font-size: 13px; }
        .route-board {
            padding: 24px;
            border-radius: 25px;
            color: #fff;
            background: linear-gradient(145deg, #112d65, #0b1730);
            box-shadow: 0 25px 55px rgba(11, 23, 48, .24);
        }
        .route-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 22px; }
        .route-head small { color: #a9bad8; }
        .online-dot { color: #54e2ad; font-size: 12px; }
        .route-row {
            display: grid;
            grid-template-columns: 1fr 72px 72px;
            gap: 10px;
            align-items: center;
            padding: 14px 0;
            border-top: 1px solid rgba(255,255,255,.1);
            font-size: 13px;
        }
        .route-row span { color: #b3c1da; }
        .route-row strong { text-align: right; color: #fff; }
        .bar { height: 6px; overflow: hidden; border-radius: 99px; background: rgba(255,255,255,.12); }
        .bar i { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, #22c6e8, #3b82f6); }
        .plans { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 42px; }
        .plan-card { padding: 25px 22px; position: relative; }
        .plan-card.recommended { border: 2px solid var(--blue); box-shadow: 0 18px 40px rgba(37, 99, 235, .16); }
        .recommend { position: absolute; right: 16px; top: 16px; color: #fff; background: var(--blue); padding: 4px 9px; border-radius: 999px; font-size: 11px; font-weight: 800; }
        .plan-card h3 { margin: 0 0 12px; font-size: 18px; }
        .price { font-size: 34px; line-height: 1; font-weight: 900; }
        .price small { color: var(--muted); font-size: 13px; font-weight: 600; }
        .plan-card ul { display: grid; gap: 9px; padding: 17px 0 18px; margin: 0; list-style: none; color: var(--muted); font-size: 13px; }
        .plan-card li i { margin-right: 7px; color: #1caf7c; }
        .plan-card .btn { width: 100%; min-height: 42px; font-size: 13px; }
        .compare-wrap { overflow-x: auto; margin-top: 36px; border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); }
        .compare { width: 100%; min-width: 680px; border-collapse: collapse; background: #fff; }
        .compare th, .compare td { padding: 17px 20px; border-bottom: 1px solid var(--line); text-align: left; font-size: 14px; }
        .compare th { color: var(--muted); background: #f8fbff; font-weight: 700; }
        .compare td:not(:first-child), .compare th:not(:first-child) { text-align: center; }
        .compare .hot { color: var(--blue); background: #f0f6ff; font-weight: 800; }
        .news-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 18px; margin-top: 38px; }
        .news-card { overflow: hidden; }
        .news-card .news-cover { height: 135px; display: grid; place-items: center; color: #cfe2ff; background: linear-gradient(135deg, #153d83, #1e74bd); font-size: 38px; }
        .news-card:nth-child(2) .news-cover { background: linear-gradient(135deg, #104c65, #17a7b6); }
        .news-card:nth-child(3) .news-cover { background: linear-gradient(135deg, #3b296e, #6551bb); }
        .news-body { padding: 20px; }
        .news-tag { color: var(--blue); font-size: 12px; font-weight: 800; }
        .rank-list { display: grid; gap: 12px; margin-top: 36px; }
        .rank-item {
            display: grid;
            grid-template-columns: 42px 1fr 110px 90px;
            align-items: center;
            gap: 14px;
            padding: 16px 20px;
            border: 1px solid rgba(255,255,255,.1);
            border-radius: 15px;
            background: rgba(255,255,255,.05);
        }
        .rank-number { color: #9ac8ff; font-size: 20px; font-weight: 900; }
        .rank-item span { color: #b8c8e0; font-size: 13px; }
        .rank-item strong { color: #fff; font-size: 14px; }
        .rank-latency { color: #57e2b0 !important; text-align: right; font-weight: 800; }
        .proof-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 40px; }
        .proof-card { padding: 25px; }
        .quote { color: #3f5e91; font-size: 15px; }
        .proof-user { display: flex; gap: 11px; align-items: center; margin-top: 22px; }
        .avatar { width: 37px; height: 37px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: #5c87d9; font-weight: 800; font-size: 13px; }
        .proof-user strong { display: block; font-size: 13px; }
        .proof-user span { display: block; color: var(--muted); font-size: 12px; }
        .partners { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 35px; }
        .partner-card { flex: 1 1 180px; padding: 20px; text-align: center; color: #4f6383; font-weight: 800; }
        .partner-card i { margin-right: 8px; color: var(--blue); }
        .assurance {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1px;
            margin-top: 40px;
            overflow: hidden;
            border: 1px solid rgba(255,255,255,.12);
            border-radius: 22px;
            background: rgba(255,255,255,.12);
        }
        .assurance-item { padding: 22px; background: rgba(255,255,255,.04); }
        .assurance-item i { color: #65d6ef; font-size: 21px; }
        .assurance-item strong { display: block; margin-top: 12px; font-size: 15px; }
        .assurance-item span { display: block; margin-top: 4px; color: #aabbd6; font-size: 12px; }
        .trial-box {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 45px;
            align-items: center;
            padding: 52px;
            border-radius: 28px;
            background: linear-gradient(135deg, #eaf3ff, #f6fbff);
            border: 1px solid #d7e7fc;
        }
        .trial-box h2 { margin: 13px 0; font-size: clamp(30px, 4vw, 47px); line-height: 1.18; letter-spacing: -.05em; }
        .trial-box p { color: var(--muted); }
        .trial-form { display: grid; gap: 12px; padding: 23px; border-radius: 20px; background: #fff; box-shadow: var(--shadow); }
        .trial-form label { color: #60708c; font-size: 13px; font-weight: 700; }
        .trial-form input { width: 100%; height: 46px; padding: 0 14px; border: 1px solid var(--line); border-radius: 11px; color: var(--ink); background: #fbfdff; }
        .trial-form input:focus { border-color: #78a7f3; outline: none; box-shadow: 0 0 0 4px rgba(37,99,235,.10); }
        .form-note { color: #8492a8; font-size: 12px; }
        footer { color: #aabbd6; background: #08142b; }
        .footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 38px; padding: 64px 0 48px; }
        footer .brand { justify-self: start; color: #fff; }
        .footer-intro { max-width: 300px; margin-top: 17px; color: #8fa4c5; font-size: 13px; }
        .footer-title { margin-bottom: 14px; color: #fff; font-size: 14px; font-weight: 800; }
        .footer-links { display: grid; gap: 9px; font-size: 13px; }
        .footer-links a:hover { color: #fff; }
        .footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding: 20px 0; border-top: 1px solid rgba(255,255,255,.1); color: #8195b5; font-size: 12px; }
        @media (max-width: 1024px) {
            .nav-shell { grid-template-columns: auto 1fr auto; }
            .brand { justify-self: start; }
            .nav-links.left { display: none; }
            .nav-links.right { justify-content: flex-end; }
            .hero-grid, .matrix { gap: 35px; }
            .plans { grid-template-columns: repeat(2, 1fr); }
            .footer-top { grid-template-columns: 1.4fr 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .container { width: min(100% - 28px, 620px); }
            .section { padding: 68px 0; }
            .nav-shell { min-height: 68px; grid-template-columns: auto 1fr auto; }
            .brand { font-size: 17px; }
            .nav-links.right { display: none; }
            .menu-toggle { display: block; justify-self: end; }
            .nav-links.mobile-open {
                position: absolute;
                left: 14px;
                right: 14px;
                top: 72px;
                display: grid;
                gap: 0;
                padding: 9px;
                border: 1px solid var(--line);
                border-radius: 16px;
                background: #fff;
                box-shadow: var(--shadow);
            }
            .nav-links.mobile-open a { padding: 11px 13px; border-radius: 10px; }
            .nav-links.mobile-open a:hover { background: #f1f6ff; }
            .hero { padding: 58px 0 50px; }
            .hero-grid, .matrix, .trial-box { grid-template-columns: 1fr; }
            .hero h1 { font-size: clamp(40px, 12vw, 62px); }
            .signal-card { right: 12px; bottom: 16px; }
            .metric-strip { grid-template-columns: repeat(2, 1fr); margin-top: 38px; }
            .metric:nth-child(2) { border-right: 0; }
            .metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
            .feature-grid, .proof-grid, .news-grid { grid-template-columns: 1fr; }
            .assurance { grid-template-columns: repeat(2, 1fr); }
            .trial-box { padding: 30px 22px; gap: 25px; }
            .footer-top { grid-template-columns: repeat(2, 1fr); gap: 28px; }
            .footer-top > :first-child { grid-column: 1 / -1; }
            .footer-bottom { flex-direction: column; }
        }
        @media (max-width: 520px) {
            .hero-actions .btn { width: 100%; }
            .plans { grid-template-columns: 1fr; }
            .rank-item { grid-template-columns: 32px 1fr 70px; }
            .rank-item span:not(.rank-latency) { display: none; }
            .rank-latency { text-align: right; }
            .assurance { grid-template-columns: 1fr 1fr; }
            .footer-top { grid-template-columns: 1fr 1fr; }
            .footer-top > :first-child { grid-column: 1 / -1; }
        }