/* roulang page: index */
:root{
--blue:#2563EB;--blue-d:#1D4ED8;--red:#E4573D;
--bg:#F7F9FC;--surface:#FFFFFF;--tint:#EEF4FF;
--ink:#111827;--muted:#64748B;--line:#E2E8F0;
--shadow:0 10px 30px rgba(15,23,42,.06);
--shadow-h:0 18px 40px rgba(15,23,42,.10);
}
*,*::before,*::after{box-sizing:border-box}
body{margin:0;padding-bottom:64px;background:var(--bg);color:var(--ink);
font:400 15px/1.75 "PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
-webkit-font-smoothing:antialiased}
h1,h2,h3,h4,p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button{font:inherit}
:focus-visible{outline:3px solid rgba(37,99,235,.35);outline-offset:2px}
.container{max-width:1200px;margin:0 auto;padding:0 32px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:var(--surface);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:30px;height:68px}
.logo{display:flex;align-items:center;gap:9px;font-size:17px;font-weight:700;letter-spacing:.3px}
.logo-mark{width:32px;height:32px;border-radius:9px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:15px;font-weight:700}
.nav{display:flex;gap:26px;font-size:14.5px;color:var(--muted)}
.nav a{padding:6px 0;transition:color .18s}
.nav a:hover,.nav a:focus-visible{color:var(--blue)}
.header-cta{margin-left:auto;height:40px;padding:0 18px;font-size:14px}
.menu{display:none;position:relative;margin-left:auto}
.menu summary{list-style:none;cursor:pointer;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;display:grid;place-items:center;color:var(--ink);font-size:14px}
.menu summary::-webkit-details-marker{display:none}
.menu-panel{position:absolute;right:0;top:50px;width:216px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:8px;display:grid;gap:2px;z-index:60}
.menu-panel a{padding:11px 12px;border-radius:9px;font-size:15px}
.menu-panel a:hover{background:var(--tint);color:var(--blue)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;height:46px;padding:0 22px;border:1px solid transparent;border-radius:11px;font-size:15px;font-weight:600;cursor:pointer;transition:background .18s,transform .18s,border-color .18s}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-d);transform:translateY(-1px)}
.btn-ghost{background:var(--surface);border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:#c3d4f0;transform:translateY(-1px)}

/* layout */
.section{padding:84px 0}
.section-white{background:var(--surface)}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:34px}
.sec-head h2{font-size:27px;font-weight:700;letter-spacing:-.2px}
.sec-head p{color:var(--muted);font-size:14.5px;margin-top:8px;max-width:680px}

/* hero */
.hero{background:var(--surface);border-bottom:1px solid var(--line);padding:60px 0 68px}
.hero-grid{display:grid;grid-template-columns:7fr 5fr;gap:52px;align-items:center}
.eyebrow{display:inline-block;font-size:13px;font-weight:600;color:var(--blue);background:var(--tint);padding:5px 13px;border-radius:999px}
.hero h1{font-size:42px;line-height:1.28;font-weight:700;margin:16px 0 14px;letter-spacing:-.6px}
.hl{color:var(--red);border-bottom:6px solid rgba(228,87,61,.16);padding-bottom:2px}
.hero-sub{font-size:17px;font-weight:600}
.hero-desc{color:var(--muted);margin-top:10px;max-width:520px}
.hero-actions{display:flex;flex-wrap:wrap;gap:13px;margin-top:26px}
.stats{display:flex;gap:38px;margin-top:32px;padding-top:22px;border-top:1px solid var(--line)}
.stats strong{display:block;font-size:23px;font-weight:700;font-variant-numeric:tabular-nums}
.stats span{font-size:13.5px;color:var(--muted)}
.hero-media{display:grid;gap:14px}
.media-main{position:relative;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:var(--shadow);background:#fff}
.media-main img{width:100%;aspect-ratio:16/9;object-fit:cover}
.play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:62px;height:62px;border:none;border-radius:50%;background:rgba(255,255,255,.93);color:var(--blue);font-size:19px;display:grid;place-items:center;cursor:pointer;box-shadow:0 8px 24px rgba(15,23,42,.2);transition:transform .18s}
.play:hover{transform:translate(-50%,-50%) scale(1.07)}
.onair{position:absolute;left:0;right:0;bottom:0;display:flex;align-items:center;gap:8px;padding:10px 14px;background:rgba(255,255,255,.96);border-top:1px solid var(--line);font-size:13.5px;font-weight:600}
.dot{width:8px;height:8px;border-radius:50%;background:var(--red);flex:none}
.media-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.mini{display:flex;gap:10px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px;transition:box-shadow .18s,transform .18s}
.mini:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.mini img{width:64px;height:40px;object-fit:cover;border-radius:7px;flex:none}
.mini span{font-size:13px;font-weight:600;line-height:1.4}

/* points */
.points{display:grid;grid-template-columns:6fr 3fr 3fr;gap:22px}
.point{background:var(--surface);border:1px solid var(--line);border-radius:17px;padding:26px;box-shadow:var(--shadow);transition:transform .18s,box-shadow .18s}
.point:hover{transform:translateY(-2px);box-shadow:var(--shadow-h)}
.point h3{font-size:17px;font-weight:700;margin-bottom:9px}
.point p{color:var(--muted);font-size:14.5px}
.point-icon{width:36px;height:36px;border-radius:10px;background:var(--tint);color:var(--blue);display:grid;place-items:center;font-size:15px;font-weight:700;margin-bottom:14px}
.bars{margin-top:18px;display:grid;gap:7px;padding:14px;background:#F5F9FF;border:1px solid var(--line);border-radius:11px}
.bars i{display:block;height:8px;border-radius:99px;background:#cfe0fd}
.bars i:nth-child(2){width:78%}
.bars i:nth-child(3){width:56%}

/* video grid */
.video-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.video-card{background:var(--surface);border:1px solid var(--line);border-radius:17px;overflow:hidden;box-shadow:var(--shadow);transition:transform .18s,box-shadow .18s}
.video-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-h)}
.thumb{position:relative;overflow:hidden;background:#dbe6f7}
.thumb img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform .2s}
.video-card:hover .thumb img{transform:scale(1.02)}
.dur{position:absolute;right:8px;bottom:8px;background:rgba(17,24,39,.75);color:#fff;font-size:12px;padding:2px 7px;border-radius:6px;font-variant-numeric:tabular-nums}
.video-body{padding:14px 16px 16px}
.video-body h3{font-size:15px;font-weight:600;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:45px;transition:color .18s}
.video-card:hover h3{color:var(--blue)}
.video-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:13px;margin-top:8px;font-variant-numeric:tabular-nums}

/* latest */
.latest-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.latest-card{display:flex;gap:14px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:10px;box-shadow:var(--shadow);transition:transform .18s,box-shadow .18s}
.latest-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-h)}
.latest-card img{width:158px;aspect-ratio:16/9;object-fit:cover;border-radius:10px;flex:none}
.latest-card h3{font-size:15px;font-weight:600;line-height:1.5}
.latest-meta{display:flex;gap:12px;color:var(--muted);font-size:13px;margin-top:6px;font-variant-numeric:tabular-nums}

/* category */
.cat-list{display:grid;grid-template-columns:1fr 1fr;gap:0 48px;border-top:1px solid var(--line)}
.cat-item{display:flex;gap:16px;padding:22px 0;border-bottom:1px solid var(--line)}
.cat-num{font-variant-numeric:tabular-nums;color:#b9c6da;font-weight:700;font-size:15px;width:26px;flex:none}
.cat-item h3{font-size:16px;font-weight:600;margin-bottom:4px}
.cat-item p{color:var(--muted);font-size:14px}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.step{background:var(--surface);border:1px solid var(--line);border-radius:17px;padding:24px;box-shadow:var(--shadow)}
.step-num{width:32px;height:32px;border-radius:10px;background:var(--tint);color:var(--blue);display:grid;place-items:center;font-weight:700;font-size:14px;font-variant-numeric:tabular-nums}
.step h3{font-size:16px;font-weight:700;margin:14px 0 8px}
.step p{color:var(--muted);font-size:14px}
.step-mock{margin-top:16px;border:1px solid var(--line);border-radius:10px;background:#F5F9FF;padding:14px;display:grid;gap:8px}
.step-mock i{display:block;height:7px;border-radius:99px;background:#cfe0fd}
.step-mock i:nth-child(2){width:72%}

/* rank */
.rank-wrap{display:grid;grid-template-columns:1fr 1fr;gap:0 40px}
.rank-item{display:flex;align-items:center;gap:14px;height:54px;padding:0 12px;border-radius:10px;transition:background .18s}
.rank-item:hover{background:var(--tint)}
.rank-num{font-variant-numeric:tabular-nums;font-weight:700;color:#b9c6da;font-size:14px;width:26px;flex:none}
.rank-num.top{color:var(--red)}
.rank-title{font-weight:600;font-size:15px;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rank-plays{color:var(--muted);font-size:13px;font-variant-numeric:tabular-nums}
.tag{background:var(--tint);color:var(--blue);font-size:12px;padding:2px 9px;border-radius:99px;font-weight:600;flex:none}

/* trust */
.trust{display:grid;grid-template-columns:1.8fr 1fr 1fr 1fr;gap:22px}
.trust-data{background:var(--surface);border:1px solid var(--line);border-radius:17px;padding:26px;box-shadow:var(--shadow)}
.trust-data h3{font-size:16px;font-weight:700;margin-bottom:16px}
.trust-nums{display:grid;gap:14px}
.trust-nums div{display:flex;align-items:baseline;justify-content:space-between;border-bottom:1px dashed var(--line);padding-bottom:10px}
.trust-nums div:last-child{border-bottom:none;padding-bottom:0}
.trust-nums strong{font-size:22px;font-weight:700;font-variant-numeric:tabular-nums;color:var(--blue)}
.trust-nums span{font-size:13.5px;color:var(--muted)}
.quote{background:var(--surface);border:1px solid var(--line);border-radius:17px;padding:22px;box-shadow:var(--shadow);display:flex;flex-direction:column;justify-content:space-between;gap:14px}
.quote p{font-size:14px;color:var(--ink);line-height:1.75}
.quote-who{font-size:13px;color:var(--muted)}

/* compare */
.cmp{background:var(--surface);border:1px solid var(--line);border-radius:17px;overflow:hidden;box-shadow:var(--shadow)}
.cmp-row{display:grid;grid-template-columns:1.3fr 1fr 1fr;align-items:center;gap:16px;padding:17px 22px;border-bottom:1px solid var(--line);font-size:14.5px}
.cmp-row:last-child{border-bottom:none}
.cmp-head{background:var(--tint);font-weight:600}
.cmp-cell{display:flex;align-items:center;gap:8px;color:var(--muted)}
.cmp-cell.yes{color:var(--ink)}
.mark-yes{color:var(--blue);font-weight:700}
.mark-no{color:#b9c6da;font-weight:700}

/* news */
.news-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:32px;align-items:start}
.news-feature{background:var(--surface);border:1px solid var(--line);border-radius:17px;overflow:hidden;box-shadow:var(--shadow);transition:transform .18s,box-shadow .18s}
.news-feature:hover{transform:translateY(-2px);box-shadow:var(--shadow-h)}
.news-feature img{width:100%;aspect-ratio:16/9;object-fit:cover}
.news-feature div{padding:18px 20px 20px}
.news-feature h3{font-size:17px;font-weight:700;line-height:1.5}
.news-date{font-size:13px;color:var(--muted);margin-top:8px}
.news-list{display:grid;gap:12px}
.news-item{display:flex;gap:12px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:10px;transition:border-color .18s,box-shadow .18s}
.news-item:hover{border-color:#c3d4f0;box-shadow:var(--shadow)}
.news-item img{width:88px;aspect-ratio:4/3;object-fit:cover;border-radius:8px;flex:none}
.news-item h4{font-size:14.5px;font-weight:600;line-height:1.5}
.news-item span{font-size:12.5px;color:var(--muted)}

/* spec */
.special{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.special-card{background:var(--surface);border:1px solid var(--line);border-radius:17px;padding:24px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:12px;transition:transform .18s,box-shadow .18s}
.special-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-h)}
.special-card.big{background:linear-gradient(0deg,#FBFDFF,#FBFDFF);border-color:#d7e4f8}
.special-card h3{font-size:17px;font-weight:700}
.special-count{font-size:13px;color:var(--blue);font-weight:600;font-variant-numeric:tabular-nums}
.special-card p{font-size:14px;color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:7px}
.chip{font-size:12.5px;color:var(--muted);background:#F2F6FD;border-radius:99px;padding:3px 10px}

/* tags */
.tag-cloud{display:flex;flex-wrap:wrap;gap:12px}
.tag-cloud li{background:var(--surface);border:1px solid var(--line);border-radius:99px;padding:9px 18px;font-size:14px;color:var(--ink);transition:border-color .18s,color .18s,transform .18s}
.tag-cloud li:hover{border-color:#c3d4f0;color:var(--blue);transform:translateY(-1px)}

/* faq */
.faq-wrap{display:grid;grid-template-columns:.85fr 1.15fr;gap:48px;align-items:start}
.faq-intro h2{font-size:27px;font-weight:700;letter-spacing:-.2px}
.faq-intro p{color:var(--muted);font-size:14.5px;margin-top:10px}
.faq-list{display:grid;gap:12px}
.faq-list details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 18px;transition:border-color .18s}
.faq-list details[open]{border-left:3px solid var(--blue)}
.faq-list summary{cursor:pointer;font-weight:600;font-size:15.5px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";color:var(--muted);font-weight:400;font-size:18px;line-height:1}
.faq-list details[open] summary::after{content:"–"}
.faq-list p{margin-top:10px;color:var(--muted);font-size:14.5px}

/* assurance */
.assurance{background:var(--tint);border-top:1px solid #dbe7fb;border-bottom:1px solid #dbe7fb}
.assurance-inner{display:grid;grid-template-columns:1fr 1fr 1fr 1fr auto;gap:0;align-items:center}
.assure-item{padding:6px 22px;border-left:1px solid #d3e1f8}
.assure-item:first-child{border-left:none;padding-left:0}
.assure-item h3{font-size:15px;font-weight:700;margin-bottom:4px}
.assure-item p{font-size:13.5px;color:#5b6b85}
.assure-cta{margin-left:22px;height:44px;padding:0 20px;font-size:14.5px}

/* cta banner */
.cta-band{background:var(--tint);border:1px solid #dbe7fb;border-radius:18px;padding:44px 48px;display:flex;align-items:center;justify-content:space-between;gap:32px;position:relative;overflow:hidden}
.cta-band::after{content:"";position:absolute;right:-40px;top:-40px;width:180px;height:180px;border-radius:50%;background:radial-gradient(circle,#dbe7fb 1px,transparent 1px);background-size:12px 12px;opacity:.7;pointer-events:none}
.cta-band h2{font-size:26px;font-weight:700;letter-spacing:-.2px}
.cta-band p{color:#5b6b85;font-size:14.5px;margin-top:8px}

/* footer */
.site-footer{background:#F1F5FB;border-top:1px solid var(--line);padding:60px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;gap:40px}
.footer-brand p{color:var(--muted);font-size:14px;margin-top:14px;max-width:280px}
.footer-col h4{font-size:14.5px;font-weight:700;margin-bottom:14px}
.footer-col ul{display:grid;gap:10px}
.footer-col a{font-size:14px;color:var(--muted);transition:color .18s}
.footer-col a:hover{color:var(--blue)}
.search{display:flex;gap:8px;margin-top:4px}
.search input{height:44px;width:100%;border:1px solid #D8E4F5;border-radius:10px;padding:0 14px;font-size:14px;background:#fff;color:var(--ink)}
.search input:focus{outline:3px solid rgba(37,99,235,.25);border-color:#b9cdf0}
.search button{height:44px;padding:0 16px;border:none;border-radius:10px;background:var(--blue);color:#fff;font-size:14px;font-weight:600;cursor:pointer;white-space:nowrap;transition:background .18s}
.search button:hover{background:var(--blue-d)}
.copyright{margin-top:44px;padding-top:20px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--muted)}

/* dock */
.dock{position:fixed;left:0;right:0;bottom:0;z-index:40;background:#fff;border-top:1px solid var(--line);box-shadow:0 -6px 20px rgba(15,23,42,.06);padding-bottom:env(safe-area-inset-bottom)}
.dock-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:64px}
.dock-inner p{font-size:14px;color:var(--muted)}
.dock-btn{height:40px;padding:0 18px;font-size:14px}

@media (max-width:1024px){
.container{padding:0 24px}
.nav{display:none}
.header-cta{display:none}
.menu{display:block}
.hero-grid{grid-template-columns:1fr;gap:36px}
.hero h1{font-size:36px}
.points{grid-template-columns:1fr 1fr}
.point-wide{grid-column:1/-1}
.video-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.faq-wrap{grid-template-columns:1fr;gap:28px}
.news-grid{grid-template-columns:1fr}
.trust{grid-template-columns:1fr 1fr}
.trust-data{grid-column:1/-1}
.rank-wrap{grid-template-columns:1fr}
.assurance-inner{grid-template-columns:1fr 1fr;gap:22px}
.assure-item{border-left:none;padding:0}
.assure-cta{margin-left:0;justify-self:start}
.footer-grid{grid-template-columns:1fr 1fr;gap:32px}
.section{padding:64px 0}
}

@media (max-width:768px){
.container{padding:0 20px}
.hero{padding:44px 0 52px}
.hero h1{font-size:31px}
.stats{gap:26px;flex-wrap:wrap}
.points{grid-template-columns:1fr}
.video-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.latest-grid{grid-template-columns:1fr}
.latest-card img{width:126px}
.cat-list{grid-template-columns:1fr}
.steps{grid-template-columns:1fr}
.special{grid-template-columns:1fr 1fr}
.trust{grid-template-columns:1fr}
.cmp-row{grid-template-columns:1.1fr 1fr 1fr;font-size:13.5px;padding:15px 16px}
.cta-band{flex-direction:column;align-items:flex-start;padding:32px 26px}
.sec-head{flex-direction:column;align-items:flex-start}
}

@media (max-width:520px){
body{padding-bottom:56px}
.container{padding:0 16px}
.header-inner{height:60px}
.hero h1{font-size:27px}
.hero-sub{font-size:15.5px}
.stats{gap:20px}
.stats strong{font-size:20px}
.media-row{grid-template-columns:1fr}
.video-grid{grid-template-columns:1fr;gap:14px}
.special{grid-template-columns:1fr}
.sec-head h2,.faq-intro h2{font-size:22px}
.cmp-row{grid-template-columns:1fr;gap:6px}
.cmp-head{display:none}
.section{padding:48px 0}
.assurance-inner{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr}
.dock-inner{height:56px}
.dock-inner p{font-size:13px}
.dock-btn{height:38px;padding:0 14px}
.cta-band h2{font-size:22px}
}