/* roulang page: index */
:root {
            --bg: #080b16;
            --bg-soft: #0d1222;
            --panel: #11182b;
            --panel-2: #151e35;
            --line: rgba(151, 170, 224, .16);
            --text: #f4f7ff;
            --muted: #9da9c4;
            --blue: #657dff;
            --blue-deep: #3f5ee8;
            --cyan: #50d7ee;
            --green: #63d6a3;
            --radius-lg: 28px;
            --radius-md: 18px;
            --shadow: 0 24px 70px rgba(0, 0, 0, .28);
        }

        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            margin: 0;
            background:
                radial-gradient(circle at 80% 0%, rgba(73, 100, 224, .18), transparent 30rem),
                var(--bg);
            color: var(--text);
            font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
            line-height: 1.75;
            overflow-x: hidden;
        }
        a { color: inherit; text-decoration: none; }
        img { max-width: 100%; display: block; }
        button, a { transition: .25s ease; }
        .container { max-width: 1180px; }
        .section { padding: 105px 0; position: relative; }
        .section-soft { background: rgba(255, 255, 255, .025); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 9px;
            color: #aebcff;
            font-size: .8rem;
            letter-spacing: .16em;
            font-weight: 700;
            text-transform: uppercase;
        }
        .eyebrow::before {
            content: "";
            width: 24px;
            height: 2px;
            background: var(--cyan);
            border-radius: 9px;
        }
        .section-title {
            margin: 14px 0 16px;
            font-weight: 800;
            letter-spacing: -.04em;
            font-size: clamp(2rem, 4vw, 3.25rem);
            line-height: 1.2;
        }
        .section-desc {
            max-width: 700px;
            color: var(--muted);
            font-size: 1.03rem;
            margin-bottom: 0;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(8, 11, 22, .78);
            backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--line);
        }
        .navbar { min-height: 76px; }
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 11px;
            font-size: 1.12rem;
            font-weight: 800;
            letter-spacing: -.03em;
        }
        .brand-mark {
            width: 35px;
            height: 35px;
            display: grid;
            place-items: center;
            color: #fff;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--blue), var(--cyan));
            box-shadow: 0 8px 25px rgba(81, 118, 255, .35);
        }
        .navbar-toggler {
            border: 1px solid var(--line);
            color: var(--text);
            padding: 8px 12px;
            border-radius: 10px;
        }
        .nav-link {
            color: #aab5ce !important;
            font-size: .92rem;
            padding: 9px 13px !important;
            border-radius: 10px;
        }
        .nav-link:hover, .nav-link.active {
            color: #fff !important;
            background: rgba(101, 125, 255, .13);
        }
        .btn-main, .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 9px;
            border-radius: 12px;
            padding: 12px 19px;
            font-size: .94rem;
            font-weight: 700;
            border: 1px solid transparent;
        }
        .btn-main {
            color: #fff;
            background: linear-gradient(135deg, var(--blue), var(--blue-deep));
            box-shadow: 0 13px 30px rgba(70, 93, 225, .25);
        }
        .btn-main:hover {
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 17px 34px rgba(70, 93, 225, .4);
        }
        .btn-outline {
            color: #e5eaff;
            border-color: var(--line);
            background: rgba(255, 255, 255, .035);
        }
        .btn-outline:hover {
            color: #fff;
            border-color: rgba(128, 151, 255, .6);
            background: rgba(101, 125, 255, .12);
        }
        .btn-main:focus-visible, .btn-outline:focus-visible, .nav-link:focus-visible {
            outline: 3px solid rgba(80, 215, 238, .45);
            outline-offset: 3px;
        }

        .hero {
            padding: 72px 0 84px;
            min-height: 620px;
            display: flex;
            align-items: center;
            background:
                linear-gradient(90deg, rgba(8, 11, 22, .98) 0%, rgba(8, 11, 22, .75) 46%, rgba(8, 11, 22, .25) 100%),
                radial-gradient(circle at 80% 38%, rgba(67, 92, 227, .24), transparent 31rem);
        }
        .hero h1 {
            max-width: 800px;
            font-size: clamp(2.8rem, 6vw, 5.7rem);
            line-height: 1.06;
            letter-spacing: -.075em;
            font-weight: 850;
            margin: 18px 0 24px;
        }
        .hero h1 span {
            background: linear-gradient(100deg, #fff, #97aaff 60%, #61dcec);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .hero-copy {
            max-width: 700px;
            color: #b6c0d6;
            font-size: 1.08rem;
            line-height: 1.9;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 29px; }
        .hero-proof {
            margin-top: 42px;
            display: flex;
            flex-wrap: wrap;
            gap: 22px;
            color: var(--muted);
            font-size: .9rem;
        }
        .hero-proof strong { color: #fff; font-size: 1.2rem; margin-right: 5px; }
        .hero-stage {
            position: relative;
            min-height: 420px;
            display: grid;
            place-items: center;
        }
        .glow {
            width: 310px;
            height: 310px;
            position: absolute;
            border-radius: 50%;
            background: rgba(80, 215, 238, .15);
            filter: blur(55px);
        }
        .network-card {
            width: min(100%, 460px);
            position: relative;
            overflow: hidden;
            border: 1px solid rgba(150, 171, 255, .23);
            border-radius: 30px;
            padding: 25px;
            background: linear-gradient(145deg, rgba(30, 41, 77, .95), rgba(14, 20, 39, .93));
            box-shadow: var(--shadow);
        }
        .network-card::before {
            content: "";
            position: absolute;
            top: -90px;
            right: -60px;
            width: 220px;
            height: 220px;
            border-radius: 50%;
            border: 1px solid rgba(101, 125, 255, .3);
            box-shadow: 0 0 0 25px rgba(101, 125, 255, .05), 0 0 0 50px rgba(101, 125, 255, .04);
        }
        .status-row { display: flex; justify-content: space-between; align-items: center; position: relative; }
        .status-label { color: #dbe2ff; font-weight: 700; }
        .status-dot {
            display: inline-block;
            width: 8px;
            height: 8px;
            background: var(--green);
            border-radius: 50%;
            margin-right: 7px;
            box-shadow: 0 0 0 5px rgba(99, 214, 163, .12);
        }
        .location-map {
            height: 205px;
            margin: 24px 0;
            position: relative;
            overflow: hidden;
            border-radius: 20px;
            background:
                linear-gradient(125deg, transparent 25%, rgba(83, 115, 203, .2) 26%, transparent 27%),
                linear-gradient(35deg, transparent 35%, rgba(83, 115, 203, .15) 36%, transparent 37%),
                #101a38;
        }
        .location-map::before, .location-map::after {
            content: "";
            position: absolute;
            background: rgba(137, 161, 238, .18);
        }
        .location-map::before { width: 120%; height: 1px; top: 48%; left: -10%; transform: rotate(-14deg); }
        .location-map::after { height: 120%; width: 1px; left: 52%; top: -10%; transform: rotate(23deg); }
        .map-pin {
            position: absolute;
            left: 52%;
            top: 45%;
            width: 44px;
            height: 44px;
            display: grid;
            place-items: center;
            border-radius: 50%;
            color: #fff;
            background: var(--blue);
            border: 7px solid rgba(101, 125, 255, .25);
            box-shadow: 0 0 0 11px rgba(101, 125, 255, .12);
        }
        .card-bottom { display: flex; justify-content: space-between; color: var(--muted); font-size: .86rem; }
        .card-bottom strong { color: #fff; display: block; font-size: 1.05rem; }

        .feature-grid, .scene-grid, .article-grid, .testimonial-grid { display: grid; gap: 18px; }
        .feature-grid { grid-template-columns: repeat(3, 1fr); margin-top: 48px; }
        .feature-card, .scene-card, .article-card, .quote-card, .price-card {
            border: 1px solid var(--line);
            background: linear-gradient(145deg, rgba(21, 30, 53, .9), rgba(14, 20, 37, .78));
            border-radius: var(--radius-md);
            transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
        }
        .feature-card { padding: 28px; min-height: 245px; }
        .feature-card:hover, .scene-card:hover, .article-card:hover, .quote-card:hover, .price-card:hover {
            transform: translateY(-5px);
            border-color: rgba(114, 139, 255, .48);
            box-shadow: 0 17px 38px rgba(0, 0, 0, .2);
        }
        .icon-box {
            width: 48px;
            height: 48px;
            display: grid;
            place-items: center;
            color: #b8c3ff;
            border-radius: 14px;
            background: rgba(101, 125, 255, .14);
            font-size: 1.2rem;
            margin-bottom: 25px;
        }
        .feature-card h3, .scene-card h3, .article-card h3, .quote-card h3 { font-size: 1.18rem; margin-bottom: 11px; }
        .feature-card p, .scene-card p, .article-card p, .quote-card p { color: var(--muted); font-size: .93rem; margin: 0; line-height: 1.8; }

        .marquee-wrap {
            overflow: hidden;
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
            background: rgba(101, 125, 255, .06);
        }
        .marquee {
            min-width: max-content;
            display: flex;
            gap: 42px;
            padding: 13px 0;
            color: #b7c4f5;
            font-size: .84rem;
            animation: slide 28s linear infinite;
        }
        .marquee i { color: var(--cyan); margin-right: 8px; }
        @keyframes slide { from { transform: translateX(0); } to { transform: translateX(-35%); } }

        .node-layout { display: grid; grid-template-columns: 1fr 1.1fr; gap: 70px; align-items: center; }
        .node-list { margin-top: 30px; display: grid; gap: 14px; }
        .node-item {
            display: flex;
            gap: 14px;
            padding: 15px 17px;
            border-radius: 15px;
            border: 1px solid var(--line);
            background: rgba(255, 255, 255, .025);
        }
        .node-item i { color: var(--cyan); margin-top: 5px; }
        .node-item strong { display: block; font-size: .98rem; }
        .node-item span { display: block; color: var(--muted); font-size: .86rem; }
        .signal-panel {
            padding: 28px;
            border-radius: var(--radius-lg);
            border: 1px solid rgba(101, 125, 255, .26);
            background: radial-gradient(circle at 80% 20%, rgba(80, 215, 238, .13), transparent 18rem), #111a34;
        }
        .signal-header { display: flex; justify-content: space-between; color: var(--muted); font-size: .85rem; }
        .signal-header strong { color: #fff; font-size: 1.2rem; }
        .chart { height: 185px; display: flex; align-items: end; gap: 10px; padding: 22px 0 8px; border-bottom: 1px solid var(--line); }
        .bar { flex: 1; border-radius: 7px 7px 2px 2px; background: linear-gradient(180deg, var(--cyan), var(--blue)); opacity: .85; }
        .signal-foot { display: flex; justify-content: space-between; padding-top: 18px; color: var(--muted); font-size: .85rem; }

        .scene-grid { grid-template-columns: repeat(4, 1fr); margin-top: 44px; }
        .scene-card { padding: 23px; min-height: 215px; }
        .scene-card .scene-number { color: #8295ff; font-size: .8rem; font-weight: 800; letter-spacing: .1em; }

        .journey {
            margin-top: 44px;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: rgba(255, 255, 255, .025);
        }
        .journey-step { padding: 28px 25px; border-right: 1px solid var(--line); position: relative; }
        .journey-step:last-child { border-right: 0; }
        .journey-step b { color: var(--cyan); font-size: .82rem; }
        .journey-step h3 { margin: 15px 0 9px; font-size: 1.1rem; }
        .journey-step p { color: var(--muted); font-size: .88rem; margin: 0; }

        .demo-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 60px; align-items: center; }
        .demo-steps { display: grid; gap: 20px; margin-top: 28px; }
        .demo-step { display: flex; gap: 15px; }
        .demo-step-number {
            flex: 0 0 34px;
            height: 34px;
            display: grid;
            place-items: center;
            color: #fff;
            border-radius: 10px;
            background: var(--blue);
            font-weight: 800;
        }
        .demo-step h3 { font-size: 1rem; margin: 0 0 4px; }
        .demo-step p { margin: 0; color: var(--muted); font-size: .88rem; }
        .dashboard {
            border-radius: 25px;
            padding: 22px;
            border: 1px solid var(--line);
            background: #0b1123;
            box-shadow: var(--shadow);
        }
        .dash-top { display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: .83rem; }
        .dash-top strong { color: #fff; font-size: 1rem; }
        .dash-list { display: grid; gap: 10px; margin-top: 22px; }
        .dash-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px;
            border: 1px solid var(--line);
            border-radius: 13px;
            background: rgba(255, 255, 255, .03);
            font-size: .85rem;
        }
        .dash-row .country { display: flex; gap: 10px; align-items: center; }
        .country-icon { width: 30px; height: 30px; display: grid; place-items: center; color: #b5c4ff; border-radius: 9px; background: rgba(101, 125, 255, .15); }
        .latency { color: var(--green); font-weight: 700; }

        .security-strip {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 18px;
            margin-top: 40px;
        }
        .security-item { padding: 23px; border-radius: 17px; background: rgba(101, 125, 255, .08); border: 1px solid var(--line); }
        .security-item i { color: var(--cyan); font-size: 1.25rem; margin-bottom: 15px; }
        .security-item strong { display: block; margin-bottom: 7px; }
        .security-item span { color: var(--muted); display: block; font-size: .86rem; }

        .stats-band { margin-top: 45px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; background: var(--line); }
        .stat { background: #10172a; padding: 29px 22px; text-align: center; }
        .stat strong { display: block; font-size: 2rem; color: #fff; letter-spacing: -.05em; }
        .stat span { color: var(--muted); font-size: .85rem; }

        .testimonial-grid { grid-template-columns: repeat(3, 1fr); margin-top: 44px; }
        .quote-card { padding: 26px; }
        .stars { color: #ffd36a; letter-spacing: 2px; margin-bottom: 17px; }
        .quote-author { display: flex; align-items: center; gap: 11px; margin-top: 21px; }
        .avatar { width: 36px; height: 36px; display: grid; place-items: center; color: #dce3ff; border-radius: 50%; background: linear-gradient(135deg, #5267db, #2b9bb3); font-size: .8rem; font-weight: 700; }
        .quote-author strong { display: block; font-size: .88rem; }
        .quote-author span { display: block; color: var(--muted); font-size: .77rem; }

        .price-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 15px; margin-top: 45px; }
        .price-card { padding: 25px; position: relative; }
        .price-card.recommended { border-color: rgba(101, 125, 255, .72); background: linear-gradient(145deg, rgba(43, 57, 111, .8), rgba(16, 23, 43, .9)); }
        .recommend { position: absolute; right: 18px; top: 18px; color: #aebaff; font-size: .7rem; padding: 4px 8px; border-radius: 5px; background: rgba(101, 125, 255, .18); }
        .price-card h3 { font-size: 1.1rem; }
        .price-card p { color: var(--muted); font-size: .83rem; min-height: 48px; }
        .price { font-size: 2.1rem; font-weight: 800; letter-spacing: -.06em; margin: 16px 0 20px; }
        .price small { color: var(--muted); font-size: .8rem; font-weight: 400; }
        .price-list { list-style: none; padding: 0; margin: 0 0 22px; display: grid; gap: 9px; color: #bec8df; font-size: .82rem; }
        .price-list i { color: var(--green); margin-right: 7px; }

        .article-grid { grid-template-columns: repeat(3, 1fr); margin-top: 44px; }
        .article-card { overflow: hidden; }
        .article-cover { height: 135px; display: grid; place-items: center; color: #aebaff; font-size: 2rem; background: linear-gradient(135deg, #1b2a5a, #142132); }
        .article-body { padding: 22px; }
        .article-meta { color: #8295c7; font-size: .75rem; margin-bottom: 10px; }

        .faq-list { max-width: 900px; margin: 42px auto 0; }
        .accordion-item { background: transparent; border: 1px solid var(--line); margin-bottom: 10px; border-radius: 14px !important; overflow: hidden; }
        .accordion-button { background: #11182b; color: #fff; box-shadow: none !important; font-weight: 700; padding: 20px; }
        .accordion-button:not(.collapsed) { color: #cdd5ff; background: #172143; }
        .accordion-button::after { filter: invert(1) brightness(1.8); }
        .accordion-body { color: var(--muted); background: #0f1629; padding: 19px 20px; font-size: .92rem; }

        .final-cta {
            padding: 80px 0;
            background:
                radial-gradient(circle at 15% 50%, rgba(80, 215, 238, .14), transparent 21rem),
                linear-gradient(135deg, #121b3a, #0b1020);
            border-top: 1px solid var(--line);
        }
        .cta-box { display: flex; justify-content: space-between; gap: 30px; align-items: center; }
        .cta-box h2 { font-size: clamp(2rem, 4vw, 3.2rem); letter-spacing: -.05em; margin: 0 0 13px; }
        .cta-box p { max-width: 650px; color: var(--muted); margin: 0; }

        footer { padding: 45px 0 28px; background: #060910; border-top: 1px solid var(--line); }
        .footer-top { display: flex; justify-content: space-between; gap: 30px; padding-bottom: 32px; border-bottom: 1px solid var(--line); }
        .footer-brand p { color: var(--muted); max-width: 360px; font-size: .85rem; margin: 17px 0 0; }
        .footer-links { display: flex; flex-wrap: wrap; gap: 20px 28px; align-content: flex-start; }
        .footer-links a { color: var(--muted); font-size: .84rem; }
        .footer-links a:hover { color: #fff; }
        .footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding-top: 22px; color: #69758e; font-size: .77rem; }

        @media (max-width: 991.98px) {
            .section { padding: 78px 0; }
            .hero { padding: 65px 0; }
            .hero-stage { min-height: 340px; margin-top: 25px; }
            .feature-grid, .scene-grid { grid-template-columns: repeat(2, 1fr); }
            .node-layout, .demo-layout { grid-template-columns: 1fr; gap: 40px; }
            .price-grid { grid-template-columns: repeat(2, 1fr); }
            .journey { grid-template-columns: repeat(2, 1fr); }
            .journey-step:nth-child(2) { border-right: 0; }
            .journey-step:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
            .testimonial-grid, .article-grid { grid-template-columns: 1fr; }
        }

        @media (max-width: 767.98px) {
            .navbar { min-height: 68px; }
            .navbar-collapse { padding: 16px 0 8px; }
            .navbar-nav { gap: 3px; }
            .nav-link { padding: 10px 12px !important; }
            .nav-cta { margin-top: 8px; width: 100%; }
            .hero { min-height: auto; padding: 58px 0 65px; }
            .hero h1 { font-size: clamp(2.55rem, 13vw, 4.5rem); }
            .hero-copy { font-size: 1rem; }
            .hero-stage { min-height: 300px; }
            .network-card { padding: 19px; }
            .feature-grid, .scene-grid, .security-strip, .stats-band { grid-template-columns: 1fr; }
            .journey { grid-template-columns: 1fr; }
            .journey-step { border-right: 0; border-bottom: 1px solid var(--line); }
            .journey-step:last-child { border-bottom: 0; }
            .price-grid { grid-template-columns: 1fr; }
            .footer-top, .footer-bottom, .cta-box { flex-direction: column; }
            .footer-links { gap: 15px 21px; }
            .stats-band { gap: 1px; }
            .stat { padding: 23px; }
        }

        @media (max-width: 520px) {
            .section { padding: 64px 0; }
            .hero-actions .btn-main, .hero-actions .btn-outline { width: 100%; }
            .hero-proof { gap: 15px; }
            .chart { height: 150px; gap: 6px; }
            .section-title { font-size: 2rem; }
            .cta-box .btn-main { width: 100%; }
        }

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}