/* roulang page: index */
:root{
            --bg:#071323;
            --bg-deep:#040b17;
            --panel:rgba(14,32,57,.78);
            --panel-soft:rgba(19,43,72,.56);
            --line:rgba(151,202,255,.16);
            --line-strong:rgba(112,215,255,.36);
            --text:#edf7ff;
            --muted:#9cb3c9;
            --subtle:#718ba5;
            --blue:#55b9ff;
            --cyan:#65e1d0;
            --violet:#9b91ff;
            --orange:#ffb56f;
            --radius:18px;
            --shadow:0 18px 55px rgba(0,0,0,.28);
            --glow:0 0 28px rgba(66,188,255,.16);
            --max:1180px;
        }
        *{box-sizing:border-box}
        html{scroll-behavior:smooth}
        body{
            margin:0;background:
            radial-gradient(circle at 82% 4%,rgba(63,114,206,.19),transparent 28rem),
            linear-gradient(180deg,#071323 0%,#081a2f 48%,#06101f 100%);
            color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
            line-height:1.7;letter-spacing:.01em
        }
        body:before{content:"";position:fixed;inset:0;pointer-events:none;opacity:.12;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:72px 72px;mask-image:linear-gradient(to bottom,#000,transparent 70%)}
        a{color:inherit;text-decoration:none}
        img{display:block;max-width:100%}
        button{font:inherit}
        .container{width:min(var(--max),calc(100% - 44px));margin:auto}
        .site-header{position:sticky;top:0;z-index:20;background:rgba(5,15,29,.78);border-bottom:1px solid var(--line);backdrop-filter:blur(18px)}
        .nav-wrap{height:78px;display:flex;align-items:center;gap:28px}
        .brand{display:flex;align-items:center;gap:11px;font-weight:800;white-space:nowrap;font-size:17px}
        .brand-mark{width:35px;height:35px;border:1px solid rgba(101,225,208,.6);border-radius:11px;display:grid;place-items:center;background:linear-gradient(145deg,#194f78,#11233f);box-shadow:var(--glow);color:var(--cyan)}
        .nav-links{display:flex;align-items:center;gap:24px;margin-left:auto}
        .nav-links a{font-size:14px;color:var(--muted);transition:.25s}
        .nav-links a:hover,.nav-links a.active{color:var(--text)}
        .nav-cta,.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;border-radius:11px;border:1px solid var(--line-strong);padding:11px 17px;color:#031322;background:linear-gradient(135deg,#72dfff,#59c8ff);font-weight:750;box-shadow:0 8px 25px rgba(65,190,255,.2);transition:.25s;cursor:pointer}
        .nav-cta:hover,.btn:hover{transform:translateY(-2px);filter:brightness(1.08);box-shadow:0 12px 30px rgba(65,190,255,.32)}
        .btn-secondary{background:rgba(18,45,75,.64);color:var(--text);box-shadow:none}
        :focus-visible{outline:3px solid rgba(101,225,208,.8);outline-offset:3px}
        .menu-toggle{display:none;background:none;border:1px solid var(--line);color:var(--text);border-radius:9px;padding:7px 10px}
        .hero{position:relative;overflow:hidden;padding:86px 0 78px}
        .hero-grid{display:grid;grid-template-columns:1.04fr .96fr;gap:54px;align-items:center}
        .eyebrow,.tag{display:inline-flex;align-items:center;gap:8px;color:var(--cyan);font-size:12px;font-weight:750;letter-spacing:.08em;text-transform:uppercase}
        .eyebrow:before{content:"";width:23px;height:1px;background:var(--cyan)}
        h1,h2,h3,p{margin-top:0}
        h1{font-size:clamp(34px,5vw,62px);line-height:1.13;letter-spacing:-.045em;margin:18px 0 21px;max-width:680px}
        .hero-copy{font-size:17px;color:#c1d3e3;max-width:650px}
        .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:30px 0}
        .status-row{display:flex;gap:10px;flex-wrap:wrap}
        .status{padding:7px 11px;border:1px solid var(--line);border-radius:9px;background:rgba(11,31,53,.7);font-size:12px;color:var(--muted)}
        .status strong{color:var(--text);font-family:ui-monospace,SFMono-Regular,monospace;margin-left:5px}
        .hero-stage{min-height:410px;border:1px solid var(--line-strong);border-radius:25px;overflow:hidden;position:relative;background:#0c223b;box-shadow:var(--shadow),var(--glow)}
        .hero-stage img{width:100%;height:100%;min-height:410px;object-fit:cover;opacity:.58}
        .hero-stage:after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(4,17,33,.08),rgba(5,18,34,.9))}
        .stage-panel{position:absolute;z-index:1;left:27px;right:27px;bottom:27px;border:1px solid rgba(155,222,255,.25);background:rgba(7,24,43,.78);backdrop-filter:blur(12px);border-radius:16px;padding:20px}
        .stage-panel h3{font-size:20px;margin-bottom:8px}
        .stage-line{height:7px;border-radius:8px;background:#183653;overflow:hidden;margin:16px 0 10px}
        .stage-line span{display:block;width:64%;height:100%;background:linear-gradient(90deg,var(--cyan),var(--blue));border-radius:8px}
        .stage-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:12px}
        .section{padding:88px 0;border-top:1px solid rgba(141,191,232,.08)}
        .section.alt{background:rgba(13,33,57,.35)}
        .section-head{display:flex;justify-content:space-between;align-items:end;gap:25px;margin-bottom:32px}
        .section h2{font-size:clamp(25px,3vw,38px);line-height:1.2;margin:9px 0 0;letter-spacing:-.03em}
        .section-intro{max-width:610px;color:var(--muted);margin:0}
        .glass{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);backdrop-filter:blur(14px)}
        .pain-track{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:16px;overflow:hidden}
        .pain-item{padding:25px 22px;background:rgba(9,27,48,.82);min-height:155px}
        .num{color:var(--cyan);font:700 13px ui-monospace,monospace}
        .pain-item h3{font-size:17px;margin:18px 0 8px}.pain-item p,.info-card p,.audience p,.news-item p{font-size:14px;color:var(--muted);margin:0}
        .version-layout{display:grid;grid-template-columns:1.25fr .75fr;gap:20px}
        .version-card{padding:30px}.version-top{display:flex;justify-content:space-between;gap:18px;align-items:start;border-bottom:1px solid var(--line);padding-bottom:22px;margin-bottom:23px}
        .version-card h3{font-size:24px;margin:6px 0}.badge{display:inline-flex;padding:5px 9px;border-radius:7px;background:rgba(101,225,208,.12);border:1px solid rgba(101,225,208,.3);color:var(--cyan);font-size:12px}
        .kv-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.kv{padding:14px 0;border-bottom:1px solid var(--line)}.kv label{display:block;color:var(--subtle);font-size:12px;margin-bottom:4px}.kv strong{font-family:ui-monospace,monospace;font-size:14px}
        .side-note{padding:28px;background:linear-gradient(150deg,rgba(65,117,190,.22),rgba(12,31,54,.8));border:1px solid var(--line-strong);border-radius:var(--radius)}
        .side-note h3{margin:0 0 12px;font-size:20px}.side-note p{color:var(--muted);font-size:14px}.mini-list{list-style:none;padding:0;margin:20px 0 0}.mini-list li{padding:10px 0;border-top:1px solid var(--line);font-size:13px;color:#c3d8e9}.mini-list li:before{content:"✓";color:var(--cyan);margin-right:9px}
        .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:18px;overflow:hidden}.step{padding:27px 22px;background:rgba(10,29,50,.72);border-right:1px solid var(--line);position:relative}.step:last-child{border:0}.step-num{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:rgba(85,185,255,.15);color:var(--blue);font-weight:800}.step h3{font-size:17px;margin:19px 0 8px}.step p{font-size:13px;color:var(--muted);margin:0}
        .compat{display:grid;grid-template-columns:1fr 1.5fr;gap:20px}.compat-note{padding:30px}.compat-note h3{font-size:22px;margin:0 0 12px}.compat-note p{color:var(--muted);font-size:14px}.device-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.device{padding:19px 20px;border:1px solid var(--line);background:rgba(14,37,62,.66);border-radius:13px}.device strong{display:block;margin-bottom:4px}.device span{color:var(--muted);font-size:13px}
        .metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.metric{padding:24px 20px}.metric b{display:block;font-size:25px;color:var(--cyan);font-family:ui-monospace,monospace;margin:8px 0}.metric span{font-size:13px;color:var(--muted)}
        .feedback{display:grid;grid-template-columns:1fr 1fr;gap:18px}.quote{padding:27px;position:relative}.quote:before{content:"“";font-size:58px;line-height:.5;color:var(--blue);opacity:.6}.quote p{font-size:17px;color:#d7e7f4;margin:12px 0 20px}.quote footer{color:var(--subtle);font-size:13px}
        .audience-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.audience{display:flex;gap:18px;align-items:start;padding:22px;border-bottom:1px solid var(--line)}.audience .icon{width:38px;height:38px;flex:0 0 38px;border-radius:10px;background:rgba(155,145,255,.15);color:var(--violet);display:grid;place-items:center;font-weight:800}.audience h3{font-size:16px;margin:0 0 4px}
        .timeline{position:relative;margin-left:8px}.timeline:before{content:"";position:absolute;left:8px;top:7px;bottom:7px;width:1px;background:var(--line-strong)}.timeline-item{position:relative;padding:0 0 28px 38px}.timeline-item:last-child{padding-bottom:0}.timeline-item:before{content:"";position:absolute;left:3px;top:7px;width:11px;height:11px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 5px rgba(101,225,208,.12)}.timeline-item h3{font-size:16px;margin:0 0 5px}.timeline-item p{color:var(--muted);font-size:14px;margin:0}
        .news-list{border-top:1px solid var(--line)}.news-item{display:grid;grid-template-columns:120px 1fr auto;gap:22px;align-items:center;padding:21px 0;border-bottom:1px solid var(--line)}.news-label{color:var(--cyan);font-size:12px}.news-item h3{font-size:17px;margin:0 0 4px}.news-item .more{font-size:13px;color:var(--blue)}
        .safety{display:grid;grid-template-columns:.8fr 1.2fr;gap:24px;align-items:stretch}.safety-copy{padding:30px;background:linear-gradient(145deg,rgba(255,181,111,.12),rgba(15,36,60,.75));border:1px solid rgba(255,181,111,.25);border-radius:var(--radius)}.safety-copy h2{font-size:25px;margin:12px 0}.safety-copy p{font-size:14px;color:var(--muted)}.checklist{padding:25px}.check{display:flex;gap:13px;padding:14px 0;border-bottom:1px solid var(--line);font-size:14px;color:#c9d9e7}.check:last-child{border:0}.check i{font-style:normal;color:var(--orange)}
        .faq-list{border-top:1px solid var(--line)}.faq{border-bottom:1px solid var(--line)}.faq summary{list-style:none;cursor:pointer;padding:19px 4px;font-weight:700;display:flex;justify-content:space-between;gap:20px}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"＋";color:var(--cyan);font-size:20px}.faq[open] summary:after{content:"－"}.faq p{color:var(--muted);font-size:14px;padding:0 35px 19px 4px;margin:0}
        .final-cta{padding:44px;border:1px solid var(--line-strong);border-radius:22px;background:radial-gradient(circle at 85% 20%,rgba(101,225,208,.15),transparent 35%),linear-gradient(120deg,rgba(26,65,105,.8),rgba(10,27,49,.85));display:flex;justify-content:space-between;align-items:center;gap:25px}.final-cta h2{font-size:29px;margin:0 0 9px}.final-cta p{color:var(--muted);margin:0;font-size:14px}
        footer{border-top:1px solid var(--line);padding:42px 0 25px;background:rgba(3,12,23,.6)}.footer-grid{display:flex;justify-content:space-between;gap:30px}.footer-brand p{color:var(--subtle);font-size:13px;max-width:330px}.footer-links{display:flex;gap:20px;flex-wrap:wrap;color:var(--muted);font-size:13px}.copyright{border-top:1px solid var(--line);margin-top:30px;padding-top:18px;color:var(--subtle);font-size:12px}
        @media(max-width:950px){.nav-links{gap:13px}.hero-grid,.version-layout,.compat,.safety{grid-template-columns:1fr}.hero{padding-top:62px}.steps{grid-template-columns:repeat(2,1fr)}.step:nth-child(2){border-right:0}.step:nth-child(-n+2){border-bottom:1px solid var(--line)}.metric-grid{grid-template-columns:repeat(2,1fr)}}
        @media(max-width:720px){.container{width:min(100% - 30px,var(--max))}.nav-wrap{height:68px}.brand{font-size:14px}.nav-cta{display:none}.menu-toggle{display:block;margin-left:auto}.nav-links{display:none;position:absolute;top:68px;left:15px;right:15px;padding:15px;flex-direction:column;align-items:stretch;background:#0a1b30;border:1px solid var(--line-strong);border-radius:14px;box-shadow:var(--shadow)}.nav-links.open{display:flex}.nav-links a{padding:9px}.hero{padding:53px 0}.hero-stage,.hero-stage img{min-height:330px}.section{padding:65px 0}.section-head{display:block}.section-intro{margin-top:14px}.pain-track,.steps,.metric-grid,.audience-grid,.feedback{grid-template-columns:1fr}.pain-item{min-height:auto;border-bottom:1px solid var(--line)}.step{border-right:0;border-bottom:1px solid var(--line)!important}.step:last-child{border-bottom:0!important}.device-list{grid-template-columns:1fr}.news-item{grid-template-columns:1fr;gap:5px}.news-item .more{margin-top:7px}.final-cta,.footer-grid{display:block}.final-cta .btn{margin-top:22px;width:100%}.kv-grid{grid-template-columns:1fr}.hero-actions .btn{width:100%}}