/* roulang page: index */
:root{
            --bg:#f8fafc;
            --bg-soft:#eef2ff;
            --surface:rgba(255,255,255,.84);
            --surface-solid:#ffffff;
            --surface-dark:#0f172a;
            --text:#0f172a;
            --muted:#64748b;
            --line:rgba(148,163,184,.20);
            --brand1:#7c3aed;
            --brand2:#ec4899;
            --brand3:#f97316;
            --shadow:0 22px 70px rgba(15,23,42,.10);
            --shadow-soft:0 14px 40px rgba(15,23,42,.08);
            --radius:28px;
            --radius-sm:18px;
        }
        html{scroll-behavior:smooth;scroll-padding-top:92px;}
        body{
            margin:0;
            color:var(--text);
            background:
                radial-gradient(circle at 10% 10%, rgba(124,58,237,.11), transparent 26%),
                radial-gradient(circle at 90% 20%, rgba(236,72,153,.10), transparent 24%),
                radial-gradient(circle at 60% 90%, rgba(249,115,22,.09), transparent 22%),
                linear-gradient(180deg, #ffffff 0%, #f8fafc 38%, #eef2ff 100%);
            font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height:1.65;
        }
        *{box-sizing:border-box}
        a{color:inherit;text-decoration:none}
        img{max-width:100%;display:block}
        button,input,textarea,select{font:inherit}
        ::selection{background:rgba(124,58,237,.2);color:#111827}
        .site-shell{
            background:var(--surface);
            border:1px solid rgba(255,255,255,.7);
            box-shadow:var(--shadow);
            backdrop-filter: blur(16px);
        }
        .panel{
            background:rgba(255,255,255,.84);
            border:1px solid var(--line);
            box-shadow:var(--shadow-soft);
            backdrop-filter: blur(16px);
        }
        .panel-dark{
            background:linear-gradient(145deg, rgba(15,23,42,.94), rgba(30,41,59,.92));
            border:1px solid rgba(255,255,255,.08);
            box-shadow:0 24px 60px rgba(15,23,42,.24);
            color:#fff;
        }
        .gradient-bar{
            background:linear-gradient(135deg, rgba(124,58,237,.98), rgba(236,72,153,.95) 56%, rgba(249,115,22,.94));
        }
        .gradient-text{
            background:linear-gradient(135deg, var(--brand1), var(--brand2) 55%, var(--brand3));
            -webkit-background-clip:text;
            background-clip:text;
            color:transparent;
        }
        .eyebrow{
            display:inline-flex;
            align-items:center;
            gap:.5rem;
            padding:.36rem .78rem;
            border-radius:999px;
            font-size:.78rem;
            letter-spacing:.18em;
            text-transform:uppercase;
            background:linear-gradient(135deg, rgba(124,58,237,.10), rgba(236,72,153,.10));
            color:#6d28d9;
            border:1px solid rgba(124,58,237,.14);
        }
        .section-title{
            font-size:clamp(1.5rem, 1.15rem + 1.55vw, 2.55rem);
            line-height:1.15;
            letter-spacing:-.03em;
            font-weight:800;
        }
        .section-desc{
            color:var(--muted);
            max-width:62ch;
        }
        .nav-pill{
            border:1px solid rgba(148,163,184,.22);
            background:rgba(255,255,255,.78);
            box-shadow:0 8px 24px rgba(15,23,42,.05);
            transition:transform .22s ease, box-shadow .22s ease, border-color .22s ease, background .22s ease;
        }
        .nav-pill:hover,
        .nav-pill:focus-visible{
            transform:translateY(-1px);
            border-color:rgba(124,58,237,.32);
            box-shadow:0 18px 34px rgba(124,58,237,.10);
            outline:none;
        }
        .nav-pill.active{
            color:#fff;
            border-color:transparent;
            background:linear-gradient(135deg, var(--brand1), var(--brand2));
            box-shadow:0 18px 35px rgba(124,58,237,.22);
        }
        .btn-main{
            display:inline-flex;
            align-items:center;
            justify-content:center;
            gap:.55rem;
            padding:.9rem 1.2rem;
            border-radius:999px;
            color:#fff;
            background:linear-gradient(135deg, var(--brand1), var(--brand2) 58%, var(--brand3));
            box-shadow:0 18px 35px rgba(124,58,237,.25);
            border:1px solid rgba(255,255,255,.08);
            transition:transform .22s ease, box-shadow .22s ease, filter .22s ease;
        }
        .btn-main:hover,
        .btn-main:focus-visible{
            transform:translateY(-2px);
            box-shadow:0 24px 48px rgba(124,58,237,.28);
            filter:saturate(1.02);
            outline:none;
        }
        .btn-soft{
            display:inline-flex;
            align-items:center;
            justify-content:center;
            gap:.55rem;
            padding:.9rem 1.2rem;
            border-radius:999px;
            border:1px solid rgba(148,163,184,.24);
            background:rgba(255,255,255,.82);
            color:#0f172a;
            transition:transform .22s ease, box-shadow .22s ease, border-color .22s ease, background .22s ease;
        }
        .btn-soft:hover,
        .btn-soft:focus-visible{
            transform:translateY(-2px);
            border-color:rgba(124,58,237,.28);
            background:#fff;
            box-shadow:0 16px 36px rgba(15,23,42,.10);
            outline:none;
        }
        .card-hover{
            transition:transform .24s ease, box-shadow .24s ease, border-color .24s ease;
        }
        .card-hover:hover{
            transform:translateY(-3px);
            box-shadow:0 22px 50px rgba(15,23,42,.12);
            border-color:rgba(124,58,237,.22);
        }
        .chip{
            display:inline-flex;
            align-items:center;
            gap:.35rem;
            padding:.38rem .7rem;
            border-radius:999px;
            font-size:.8rem;
            line-height:1;
            border:1px solid rgba(148,163,184,.20);
            background:rgba(255,255,255,.72);
            color:#334155;
        }
        .chip.hot{
            color:#fff;
            border-color:transparent;
            background:linear-gradient(135deg, rgba(124,58,237,.95), rgba(236,72,153,.95));
        }
        .metric{
            border-radius:20px;
            background:rgba(255,255,255,.76);
            border:1px solid rgba(148,163,184,.16);
            padding:1rem 1.05rem;
        }
        .metric strong{
            display:block;
            font-size:1.1rem;
            color:#111827;
            line-height:1.1;
        }
        .metric span{color:var(--muted);font-size:.85rem}
        .section-card{
            border-radius:var(--radius);
            background:var(--surface-solid);
            border:1px solid rgba(148,163,184,.18);
            box-shadow:var(--shadow-soft);
        }
        .mini-list li{
            position:relative;
            padding-left:1.35rem;
        }
        .mini-list li::before{
            content:"";
            position:absolute;
            left:0;
            top:.6rem;
            width:.55rem;
            height:.55rem;
            border-radius:999px;
            background:linear-gradient(135deg, var(--brand1), var(--brand2));
            box-shadow:0 0 0 4px rgba(124,58,237,.08);
        }
        details.faq-item{
            border-radius:22px;
            border:1px solid rgba(148,163,184,.18);
            background:rgba(255,255,255,.86);
            box-shadow:0 10px 30px rgba(15,23,42,.06);
            overflow:hidden;
            transition:transform .22s ease, box-shadow .22s ease, border-color .22s ease;
        }
        details.faq-item:hover{
            transform:translateY(-2px);
            border-color:rgba(124,58,237,.24);
            box-shadow:0 18px 40px rgba(15,23,42,.09);
        }
        details.faq-item summary{
            list-style:none;
            cursor:pointer;
            padding:1rem 1.1rem;
            display:flex;
            align-items:center;
            justify-content:space-between;
            gap:1rem;
            font-weight:700;
            color:#111827;
        }
        details.faq-item summary::-webkit-details-marker{display:none}
        details.faq-item summary .arrow{
            width:1.95rem;
            height:1.95rem;
            border-radius:999px;
            flex:0 0 auto;
            display:grid;
            place-items:center;
            color:#6d28d9;
            background:linear-gradient(135deg, rgba(124,58,237,.12), rgba(236,72,153,.10));
            transition:transform .22s ease, background .22s ease;
        }
        details.faq-item[open] summary .arrow{transform:rotate(45deg)}
        details.faq-item .answer{
            padding:0 1.1rem 1.15rem 1.1rem;
            color:var(--muted);
        }
        .timeline{
            position:relative;
        }
        .timeline-item{
            position:relative;
            padding:1rem 1rem 1rem 1.05rem;
            border-radius:24px;
            background:rgba(255,255,255,.86);
            border:1px solid rgba(148,163,184,.18);
            box-shadow:0 10px 30px rgba(15,23,42,.05);
        }
        .timeline-item::before{
            content:"";
            position:absolute;
            left:1rem;
            top:1.1rem;
            width:.8rem;
            height:.8rem;
            border-radius:999px;
            background:linear-gradient(135deg, var(--brand1), var(--brand2));
            box-shadow:0 0 0 6px rgba(124,58,237,.10);
        }
        .timeline-item .inner{
            padding-left:1.35rem;
        }
        .footer-link{
            transition:color .2s ease, opacity .2s ease;
        }
        .footer-link:hover,
        .footer-link:focus-visible{
            color:#fff;
            opacity:.96;
            outline:none;
        }
        .toast{
            position:fixed;
            right:1rem;
            bottom:1rem;
            z-index:80;
            min-width:240px;
            max-width:min(90vw, 360px);
            transform:translateY(120%);
            opacity:0;
            pointer-events:none;
            transition:transform .28s ease, opacity .28s ease;
        }
        .toast.show{
            transform:translateY(0);
            opacity:1;
        }
        .count-box{
            min-width:4.2rem;
            border-radius:18px;
            background:rgba(255,255,255,.12);
            border:1px solid rgba(255,255,255,.12);
            padding:.7rem .55rem;
            text-align:center;
        }
        .count-box strong{
            display:block;
            font-size:1.35rem;
            line-height:1;
            color:#fff;
        }
        .count-box span{
            display:block;
            margin-top:.2rem;
            color:rgba(255,255,255,.72);
            font-size:.74rem;
        }
        .cover-grid{
            background:
                radial-gradient(circle at 20% 20%, rgba(255,255,255,.24), transparent 24%),
                radial-gradient(circle at 80% 10%, rgba(255,255,255,.14), transparent 18%),
                linear-gradient(145deg, rgba(124,58,237,.92), rgba(236,72,153,.92) 54%, rgba(249,115,22,.92));
        }
        .screen-card{
            background:rgba(255,255,255,.90);
            border:1px solid rgba(255,255,255,.28);
            box-shadow:0 18px 40px rgba(15,23,42,.10);
            backdrop-filter: blur(18px);
        }
        .hover-lift{
            transition:transform .22s ease, box-shadow .22s ease;
        }
        .hover-lift:hover{
            transform:translateY(-3px);
            box-shadow:0 18px 42px rgba(15,23,42,.10);
        }
        .countdown-grid{
            display:grid;
            grid-template-columns:repeat(4, minmax(0, 1fr));
            gap:.7rem;
        }
        @media (max-width: 1024px){
            .countdown-grid{grid-template-columns:repeat(2, minmax(0, 1fr));}
        }
        @media (max-width: 768px){
            header .header-stack{flex-direction:column; align-items:stretch;}
            .countdown-grid{grid-template-columns:repeat(4, minmax(0, 1fr));}
        }
        @media (max-width: 520px){
            .countdown-grid{grid-template-columns:repeat(2, minmax(0, 1fr));}
            .section-title{letter-spacing:-.02em}
            details.faq-item summary{padding:1rem .95rem}
            .timeline-item{padding:.95rem}
        }
        @media (prefers-reduced-motion: reduce){
            html{scroll-behavior:auto}
            *,*::before,*::after{animation:none!important;transition:none!important}
        }