/* roulang page: index */
:root{
      --primary:#165dff;
      --primary-dark:#0c3fa8;
      --cyan:#12b8c9;
      --ink:#152238;
      --muted:#6d7b91;
      --soft:#f4f7fb;
      --line:#e5ebf4;
      --white:#fff;
      --shadow:0 18px 45px rgba(28,61,112,.10);
      --shadow-sm:0 8px 24px rgba(28,61,112,.08);
      --radius:16px;
      --radius-sm:10px;
      --container:1180px;
    }
    *{box-sizing:border-box;margin:0;padding:0}
    html{scroll-behavior:smooth}
    body{font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--ink);background:var(--white);line-height:1.7;font-size:15px}
    a{color:inherit;text-decoration:none}
    img{display:block;width:100%;object-fit:cover}
    button,input{font:inherit}
    button{cursor:pointer;border:0}
    :focus-visible{outline:3px solid rgba(22,93,255,.28);outline-offset:3px}
    .container{width:min(var(--container),calc(100% - 40px));margin:0 auto}
    .topbar{height:76px;border-bottom:1px solid rgba(229,235,244,.8);background:rgba(255,255,255,.94);position:sticky;top:0;z-index:20;backdrop-filter:blur(12px)}
    .nav-wrap{height:100%;display:flex;align-items:center;justify-content:space-between;gap:25px}
    .brand{display:flex;align-items:center;gap:11px;font-size:18px;font-weight:800;white-space:nowrap}
    .brand-mark{width:36px;height:36px;border-radius:10px;background:var(--primary);color:#fff;display:grid;place-items:center;font-weight:900;box-shadow:0 8px 18px rgba(22,93,255,.24)}
    .nav{display:flex;align-items:center;gap:27px}
    .nav a{color:#58677e;font-weight:600;position:relative;padding:25px 0}
    .nav a:hover,.nav a.active{color:var(--primary)}
    .nav a.active:after{content:"";height:3px;width:22px;border-radius:4px;background:var(--primary);position:absolute;bottom:15px;left:50%;transform:translateX(-50%)}
    .nav-action{padding:10px 16px!important;border:1px solid #dce6f7;border-radius:9px;color:var(--primary)!important}
    .menu-toggle{display:none;background:none;color:var(--ink);font-size:25px}
    .hero{background:#f4f8ff;min-height:550px;display:flex;align-items:center;position:relative;overflow:hidden}
    .hero:after{content:"";position:absolute;right:-100px;top:-140px;width:520px;height:520px;border:1px solid #d8e7ff;border-radius:50%;box-shadow:0 0 0 55px #edf4ff,0 0 0 110px #f8fbff}
    .hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:72px;align-items:center;position:relative;z-index:1;padding:70px 0}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--primary);font-weight:700;font-size:13px;margin-bottom:17px}
    .eyebrow i{display:inline-block;width:8px;height:8px;background:var(--cyan);border-radius:50%;box-shadow:0 0 0 5px #d7f7fa}
    h1{font-size:clamp(36px,5vw,62px);line-height:1.15;letter-spacing:0;font-weight:900;max-width:650px}
    h1 em{font-style:normal;color:var(--primary)}
    .hero h2{font-size:20px;margin:22px 0 12px;font-weight:700}
    .hero-copy{font-size:16px;color:var(--muted);max-width:590px}
    .hero-actions{display:flex;gap:12px;margin-top:28px;flex-wrap:wrap}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:9px;padding:12px 21px;font-weight:700;transition:.2s ease}
    .btn-primary{color:#fff;background:var(--primary);box-shadow:0 10px 20px rgba(22,93,255,.19)}
    .btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px)}
    .btn-light{color:var(--ink);background:#fff;border:1px solid var(--line)}
    .btn-light:hover{border-color:var(--primary);color:var(--primary)}
    .hero-visual{position:relative}
    .hero-image{height:360px;border-radius:20px;box-shadow:var(--shadow);object-fit:cover}
    .hero-panel{position:absolute;left:-24px;bottom:24px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm);border-radius:12px;padding:16px 18px;width:205px}
    .hero-panel strong{display:block;font-size:25px;color:var(--primary);line-height:1.2}
    .hero-panel span{font-size:13px;color:var(--muted)}
    section{padding:86px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:25px;margin-bottom:30px}
    .section-head h2{font-size:30px;line-height:1.25}
    .section-head p{max-width:630px;color:var(--muted)}
    .text-link{color:var(--primary);font-weight:700;white-space:nowrap}
    .text-link:hover{text-decoration:underline}
    .trust-strip{padding:25px 0;background:#fff;border-bottom:1px solid var(--line)}
    .trust-items{display:grid;grid-template-columns:repeat(4,1fr);gap:25px}
    .trust-item{display:flex;gap:12px;align-items:center}
    .trust-icon{width:39px;height:39px;background:#edf4ff;color:var(--primary);border-radius:10px;display:grid;place-items:center;font-weight:900}
    .trust-item strong{display:block;font-size:14px}.trust-item span{display:block;color:var(--muted);font-size:12px}
    .section-soft{background:var(--soft)}
    .feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
    .feature{background:#fff;border:1px solid var(--line);padding:25px;border-radius:var(--radius);box-shadow:var(--shadow-sm)}
    .feature .num{color:var(--primary);font-weight:900;font-size:13px}.feature h3{font-size:20px;margin:12px 0 8px}.feature p{color:var(--muted);font-size:14px}
    .media-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
    .media-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden;box-shadow:var(--shadow-sm);transition:.22s ease}
    .media-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
    .media-card img{height:190px}
    .media-body{padding:15px}
    .media-body h3{font-size:16px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-bottom:10px}
    .meta{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:12px}
    .badge{font-size:11px;padding:3px 7px;border-radius:5px;background:#eaf8f3;color:#12825d;font-weight:700}
    .badge.blue{background:#edf4ff;color:var(--primary)}.badge.gold{background:#fff5da;color:#9c6a00}
    .rating{color:#ed9d15;font-weight:800}
    .popular{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
    .popular-card{min-height:250px;border-radius:var(--radius);overflow:hidden;position:relative;color:#fff;background:#183558}
    .popular-card img{height:250px;opacity:.82;transition:.3s}.popular-card:hover img{transform:scale(1.04);opacity:.68}
    .popular-info{position:absolute;left:20px;right:20px;bottom:17px}.popular-info h3{font-size:21px}.popular-info p{font-size:13px;color:#dce7f7;margin-top:3px}
    .category-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:13px}
    .category{padding:22px 17px;border:1px solid var(--line);border-radius:12px;background:#fff;transition:.2s}
    .category:hover{border-color:#9bbdff;box-shadow:var(--shadow-sm);transform:translateY(-3px)}
    .category h3{font-size:17px;margin-bottom:8px}.category p{font-size:13px;color:var(--muted)}
    .ranking-layout{display:grid;grid-template-columns:1fr .8fr;gap:45px;align-items:start}
    .rank-list{display:grid;grid-template-columns:1fr 1fr;gap:0 30px}
    .rank-item{display:grid;grid-template-columns:30px 1fr auto;gap:10px;align-items:center;padding:15px 0;border-bottom:1px solid var(--line)}
    .rank-no{font-size:19px;font-weight:900;color:#a6b1c1}.rank-item:nth-child(-n+3) .rank-no{color:var(--primary)}
    .rank-title{font-weight:700}.rank-title small{display:block;color:var(--muted);font-size:11px;font-weight:400}
    .rank-hot{font-size:12px;color:#f18348}
    .quote-panel{background:#102b52;color:#fff;border-radius:18px;padding:30px}
    .quote-panel .quote-mark{font-size:45px;line-height:.8;color:#61d2db}
    .quote-panel p{font-size:18px;line-height:1.8;margin:16px 0 25px;color:#e0eaf7}.quote-panel span{color:#9fb6d6;font-size:13px}
    .news-layout{display:grid;grid-template-columns:1.2fr .8fr;gap:30px}
    .news-main{position:relative;border-radius:16px;overflow:hidden;min-height:310px;color:#fff}
    .news-main img{height:310px}.news-main:after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(8,27,56,.85),transparent 65%)}
    .news-main-content{position:absolute;z-index:1;bottom:22px;left:24px;right:24px}.news-main h3{font-size:24px}.news-main p{font-size:13px;color:#d3e0f2}
    .news-list{display:grid;gap:13px}.news-item{display:flex;gap:13px;border-bottom:1px solid var(--line);padding-bottom:13px}.news-item img{width:98px;height:70px;border-radius:8px}.news-item h3{font-size:15px;line-height:1.45}.news-item time{font-size:12px;color:var(--muted)}
    .evidence{background:#f6fbfc}
    .evidence-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
    .evidence-card{background:#fff;border-radius:14px;padding:24px;border:1px solid #dceff1}.evidence-card strong{font-size:34px;color:var(--primary);display:block}.evidence-card p{color:var(--muted);font-size:14px;margin-top:5px}
    .faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px 25px}
    .faq{border-bottom:1px solid var(--line);padding:10px 0 17px}.faq button{width:100%;text-align:left;background:none;display:flex;justify-content:space-between;align-items:center;font-weight:700;color:var(--ink);padding:5px 0}.faq button span{font-size:20px;color:var(--primary);transition:.2s}.faq.open button span{transform:rotate(45deg)}.faq p{display:none;color:var(--muted);font-size:14px;padding:8px 25px 0 0}.faq.open p{display:block}
    .closing{padding:65px 0;background:#165dff;color:#fff}.closing-inner{display:flex;justify-content:space-between;align-items:center;gap:30px}.closing h2{font-size:31px}.closing p{color:#dbe7ff;margin-top:8px}.closing .btn-light{border:0;color:var(--primary)}
    footer{background:#10233e;color:#b8c8de;padding:58px 0 22px}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:35px;padding-bottom:40px}.footer-brand{color:#fff;font-size:18px;font-weight:800;margin-bottom:13px}.footer-col h3{color:#fff;font-size:15px;margin-bottom:15px}.footer-col a{display:block;font-size:13px;margin:9px 0;color:#b8c8de}.footer-col a:hover{color:#fff}.footer-note{font-size:13px;line-height:1.8;max-width:300px}.copyright{border-top:1px solid rgba(255,255,255,.12);padding-top:20px;font-size:12px;color:#8ea5c2;display:flex;justify-content:space-between;gap:15px}
    @media(max-width:1024px){.hero-inner{gap:35px}.media-grid{grid-template-columns:repeat(3,1fr)}.category-grid{grid-template-columns:repeat(3,1fr)}.ranking-layout{gap:25px}}
    @media(max-width:768px){.container{width:min(100% - 30px,var(--container))}.nav{display:none;position:absolute;left:15px;right:15px;top:68px;background:#fff;box-shadow:var(--shadow);border:1px solid var(--line);border-radius:12px;padding:8px 18px;flex-direction:column;align-items:stretch;gap:0}.nav.open{display:flex}.nav a{padding:11px 0}.nav a.active:after{display:none}.menu-toggle{display:block}.hero-inner{grid-template-columns:1fr;padding:60px 0}.hero{min-height:auto}.hero:after{opacity:.45}.hero-visual{max-width:600px}.hero-image{height:280px}.trust-items{grid-template-columns:repeat(2,1fr)}section{padding:64px 0}.section-head{display:block}.section-head p{margin-top:10px}.feature-grid,.popular,.evidence-grid{grid-template-columns:1fr 1fr}.media-grid{grid-template-columns:repeat(2,1fr)}.ranking-layout,.news-layout{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.closing-inner{display:block}.closing .btn{margin-top:22px}}
    @media(max-width:520px){h1{font-size:38px}.hero h2{font-size:17px}.hero-copy{font-size:14px}.hero-panel{left:12px;bottom:14px}.hero-panel strong{font-size:20px}.trust-items,.feature-grid,.popular,.category-grid,.media-grid,.evidence-grid,.faq-grid{grid-template-columns:1fr}.rank-list{grid-template-columns:1fr}.media-card img{height:210px}.section-head h2{font-size:26px}.footer-grid{grid-template-columns:1fr}.copyright{display:block}.copyright span{display:block;margin-top:7px}}