/* roulang page: index */
:root{
  --bgx:#0b0e14;
  --surf:#121722;
  --surf2:#19202d;
  --txt:#eef1f6;
  --sub:#98a2b5;
  --brd:#243044;
  --hot:#ff5c4d;
  --cool:#5ad1c5;
  --r1:10px;
  --r2:18px;
  --shd:0 12px 30px rgba(0,0,0,.38);
  --pad:clamp(18px,4vw,40px);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bgx);
  color:var(--txt);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.78;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
h1,h2,h3{margin:0 0 12px;line-height:1.3;letter-spacing:.4px}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0 0 14px}
.xcslvn-wrap{width:min(1180px,calc(100% - 36px));margin:0 auto}

/* 顶栏 */
.xcslvn-head{
  position:sticky;top:0;z-index:40;
  background:rgba(11,14,20,.88);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--brd);
}
.xcslvn-headin{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 0;flex-wrap:wrap}
.xcslvn-brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;letter-spacing:.5px}
.xcslvn-mark{
  width:38px;height:38px;border-radius:12px;
  background:linear-gradient(140deg,var(--hot),#ff9a6b);
  color:#1d100c;font-weight:800;font-size:18px;
  display:grid;place-items:center;flex:none;
}
.xcslvn-nav{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;max-width:100%}
.xcslvn-nav::-webkit-scrollbar{display:none}
.xcslvn-nav a{
  display:flex;align-items:center;min-height:44px;
  padding:0 14px;border-radius:999px;
  font-size:15px;color:var(--sub);white-space:nowrap;
  transition:color .2s,background .2s;
}
.xcslvn-nav a:hover,.xcslvn-nav a:focus-visible{color:var(--txt);background:var(--surf2);outline:none}
.xcslvn-nav a.xcslvn-on{color:var(--hot);background:rgba(255,92,77,.1)}

/* 首屏 */
.xcslvn-hero{
  position:relative;
  padding:clamp(30px,5vw,62px) 0 clamp(34px,5vw,66px);
  background:url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
}
.xcslvn-hero::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(11,14,20,.84) 0%,rgba(11,14,20,.96) 100%);
}
.xcslvn-hero .xcslvn-wrap{position:relative;z-index:1}
.xcslvn-greet{max-width:860px}
.xcslvn-kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;letter-spacing:2px;color:var(--cool);
  border:1px solid rgba(90,209,197,.34);
  border-radius:999px;padding:4px 14px;margin-bottom:16px;
}
.xcslvn-greet h1{
  font-size:clamp(28px,5vw,46px);
  font-weight:800;letter-spacing:1px;
}
.xcslvn-greet h1 em{font-style:normal;color:var(--hot)}
.xcslvn-greet p{color:var(--sub);font-size:16px;max-width:760px;margin-bottom:22px}
.xcslvn-btns{display:flex;flex-wrap:wrap;gap:12px}
.xcslvn-btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:46px;padding:0 24px;border-radius:999px;
  background:var(--hot);color:#1d100c;font-weight:700;font-size:15px;
  border:1px solid transparent;
  transition:transform .22s,box-shadow .22s,background .22s;
}
.xcslvn-btn:hover,.xcslvn-btn:focus-visible{transform:translateY(-2px);box-shadow:0 10px 24px rgba(255,92,77,.28);outline:none}
.xcslvn-btn-ghost{background:transparent;border-color:var(--brd);color:var(--txt)}
.xcslvn-btn-ghost:hover,.xcslvn-btn-ghost:focus-visible{background:var(--surf2);box-shadow:none;border-color:#3a4b66}

.xcslvn-versus{
  display:grid;grid-template-columns:1fr 1fr;gap:16px;
  margin-top:clamp(26px,4vw,40px);
}
.xcslvn-frame{
  position:relative;margin:0;overflow:hidden;
  border-radius:var(--r2);border:1px solid var(--brd);
  background:var(--surf);box-shadow:var(--shd);
}
.xcslvn-frame img{width:100%;aspect-ratio:16/10;object-fit:cover}
.xcslvn-frame figcaption{
  padding:12px 16px;font-size:14px;color:var(--sub);
  border-top:1px solid var(--brd);background:var(--surf);
}
.xcslvn-frame-before img{filter:grayscale(.55) brightness(.68) contrast(.92)}
.xcslvn-frame-after img{filter:saturate(1.08) contrast(1.05)}
.xcslvn-tagline{
  position:absolute;top:12px;left:12px;
  font-size:12px;font-weight:700;letter-spacing:1px;
  padding:3px 10px;border-radius:6px;
  background:rgba(11,14,20,.78);color:var(--txt);
}
.xcslvn-frame-after .xcslvn-tagline{background:rgba(255,92,77,.9);color:#1d100c}

/* 通用区块 */
.xcslvn-sec{
  padding:clamp(34px,5vw,64px) 0;
  border-top:1px solid rgba(36,48,68,.6);
  scroll-margin-top:84px;
}
.xcslvn-sec-alt{background:var(--surf2);border-top-color:rgba(36,48,68,.9)}
.xcslvn-sec h2{font-size:clamp(21px,3vw,28px);font-weight:800}
.xcslvn-sec h2 span{color:var(--hot)}
.xcslvn-lead{color:var(--sub);max-width:840px;font-size:15px;margin-bottom:26px}

/* 指标 */
.xcslvn-kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.xcslvn-kpis li{
  background:var(--surf);border:1px solid var(--brd);
  border-radius:var(--r1);padding:18px 20px;
}
.xcslvn-kpis strong{display:block;font-size:18px;color:var(--cool);letter-spacing:.5px}
.xcslvn-kpis span{display:block;font-size:13.5px;color:var(--sub);margin-top:6px;line-height:1.7}

/* 频道矩阵 */
.xcslvn-chans{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.xcslvn-chans li{
  background:var(--surf);border:1px solid var(--brd);
  border-radius:var(--r1);padding:16px 18px;
  transition:border-color .2s,transform .2s;
}
.xcslvn-chans li:hover{border-color:#3a4b66;transform:translateY(-2px)}
.xcslvn-chans b{display:block;font-size:16px;margin-bottom:6px}
.xcslvn-chans span{display:block;font-size:13.5px;color:var(--sub);line-height:1.75}

/* 卡片墙 */
.xcslvn-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(182px,1fr));gap:18px}
.xcslvn-card{
  background:var(--surf);border:1px solid var(--brd);
  border-radius:var(--r2);overflow:hidden;height:100%;
  transition:transform .25s,box-shadow .25s,border-color .25s;
}
.xcslvn-card:hover{transform:translateY(-4px);box-shadow:var(--shd);border-color:#3a4b66}
.xcslvn-thumb{
  position:relative;margin:0;display:block;
  aspect-ratio:2/3;background:var(--surf2);overflow:hidden;
}
.xcslvn-thumb img{width:100%;height:100%;object-fit:cover}
.xcslvn-badge{
  position:absolute;top:8px;left:8px;
  font-size:12px;font-weight:700;letter-spacing:.5px;
  padding:2px 8px;border-radius:6px;
  background:rgba(255,92,77,.92);color:#1d100c;
}
.xcslvn-score{
  position:absolute;right:8px;bottom:8px;
  font-size:13px;font-weight:700;
  padding:2px 8px;border-radius:6px;
  background:rgba(11,14,20,.84);color:var(--cool);
}
.xcslvn-cardb{padding:12px 14px 16px}
.xcslvn-cardb h3{font-size:16px;margin-bottom:4px}
.xcslvn-cardb p{font-size:13px;color:var(--sub);margin:0;line-height:1.7}

/* 榜单列表 */
.xcslvn-rank{display:grid;gap:10px}
.xcslvn-rank li{
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:14px;
  background:var(--surf);border:1px solid var(--brd);
  border-radius:var(--r1);padding:14px 18px;
}
.xcslvn-rank i{
  font-style:normal;font-weight:800;font-size:15px;
  color:var(--sub);width:26px;text-align:center;
}
.xcslvn-rank b{font-size:15.5px;font-weight:700}
.xcslvn-rank em{font-style:normal;display:block;font-size:13px;color:var(--sub);margin-top:2px;line-height:1.7}
.xcslvn-rank u{
  text-decoration:none;font-weight:800;font-size:15px;
  color:var(--hot);white-space:nowrap;
}

/* 双栏对照 */
.xcslvn-duo{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.xcslvn-duo article{
  background:var(--surf);border:1px solid var(--brd);
  border-radius:var(--r2);padding:22px 24px;
}
.xcslvn-duo h3{font-size:18px;color:var(--cool)}
.xcslvn-duo ul{display:grid;gap:8px;margin-bottom:14px}
.xcslvn-duo li{
  font-size:14.5px;color:var(--txt);
  padding-left:14px;position:relative;
}
.xcslvn-duo li::before{
  content:"";position:absolute;left:0;top:12px;
  width:5px;height:5px;border-radius:50%;background:var(--hot);
}
.xcslvn-duo p{font-size:13.5px;color:var(--sub);margin:0}

/* 年代回顾 */
.xcslvn-era{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.xcslvn-era li{
  background:var(--surf);border:1px solid var(--brd);
  border-radius:var(--r1);padding:16px 18px;
}
.xcslvn-era b{display:block;font-size:14px;color:var(--hot);letter-spacing:1.5px;margin-bottom:8px}
.xcslvn-era span{display:block;font-size:14px;color:var(--sub);line-height:1.9}

/* 资讯 */
.xcslvn-news{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.xcslvn-news article{
  background:var(--surf);border:1px solid var(--brd);
  border-radius:var(--r2);overflow:hidden;
  transition:transform .25s,border-color .25s,box-shadow .25s;
}
.xcslvn-news article:hover{transform:translateY(-3px);border-color:#3a4b66;box-shadow:var(--shd)}
.xcslvn-news figure{margin:0}
.xcslvn-news img{width:100%;aspect-ratio:16/9;object-fit:cover}
.xcslvn-news h3{font-size:16px;padding:14px 16px 0;margin-bottom:6px}
.xcslvn-news time{display:block;padding:0 16px 16px;font-size:12.5px;color:var(--sub)}

/* 专题 */
.xcslvn-sets{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.xcslvn-sets li{
  background:var(--surf);border:1px solid var(--brd);
  border-radius:var(--r2);padding:20px 22px;
  transition:border-color .2s,transform .2s;
}
.xcslvn-sets li:hover{border-color:#3a4b66;transform:translateY(-2px)}
.xcslvn-sets b{display:block;font-size:17px;margin-bottom:6px}
.xcslvn-sets p{font-size:13.5px;color:var(--sub);margin:0 0 10px}
.xcslvn-pill{
  display:inline-block;font-size:12px;letter-spacing:1px;
  padding:3px 10px;border-radius:999px;
  border:1px solid rgba(90,209,197,.36);color:var(--cool);
}

/* 平台保障 */
.xcslvn-shield{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.xcslvn-shield li{
  background:var(--surf);border:1px solid var(--brd);
  border-radius:var(--r1);padding:18px 20px;
}
.xcslvn-shield b{display:block;font-size:15.5px;color:var(--hot);margin-bottom:6px}
.xcslvn-shield span{display:block;font-size:13.5px;color:var(--sub);line-height:1.75}

/* 快速解答 */
.xcslvn-faq{display:grid;gap:12px;max-width:900px}
.xcslvn-faq details{
  background:var(--surf);border:1px solid var(--brd);
  border-radius:var(--r1);padding:0 18px;
  transition:border-color .2s;
}
.xcslvn-faq details[open]{border-color:#3a4b66}
.xcslvn-faq summary{
  display:flex;align-items:center;min-height:52px;
  cursor:pointer;font-weight:700;font-size:15.5px;
  list-style:none;
}
.xcslvn-faq summary::-webkit-details-marker{display:none}
.xcslvn-faq summary::after{
  content:"+";margin-left:auto;color:var(--hot);
  font-size:19px;font-weight:700;line-height:1;
}
.xcslvn-faq details[open] summary::after{content:"–"}
.xcslvn-faq p{font-size:14.5px;color:var(--sub);margin:0 0 16px}

/* 页脚 */
.xcslvn-foot{
  border-top:1px solid var(--brd);
  background:#080b11;
  padding:46px 0 22px;
}
.xcslvn-foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:26px}
.xcslvn-foot-grid h3{font-size:15px;color:var(--txt);margin-bottom:12px}
.xcslvn-foot-grid p{font-size:13.5px;color:var(--sub);margin:0}
.xcslvn-foot-grid ul{display:grid;gap:4px}
.xcslvn-foot-grid li a{
  display:inline-flex;align-items:center;min-height:34px;
  font-size:13.5px;color:var(--sub);transition:color .2s;
}
.xcslvn-foot-grid li a:hover,.xcslvn-foot-grid li a:focus-visible{color:var(--hot);outline:none}
.xcslvn-copy{
  margin-top:32px;padding-top:18px;
  border-top:1px solid rgba(36,48,68,.7);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  font-size:13px;color:var(--sub);
}
.xcslvn-foot-brand{display:flex;align-items:center;gap:10px;margin-bottom:10px;font-weight:700;font-size:16px}

@media (max-width:1024px){
  .xcslvn-kpis{grid-template-columns:repeat(2,1fr)}
  .xcslvn-chans{grid-template-columns:repeat(2,1fr)}
  .xcslvn-shield{grid-template-columns:repeat(2,1fr)}
  .xcslvn-era{grid-template-columns:repeat(3,1fr)}
  .xcslvn-foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  .xcslvn-headin{padding:8px 0}
  .xcslvn-nav{width:100%}
  .xcslvn-versus{grid-template-columns:1fr}
  .xcslvn-duo{grid-template-columns:1fr}
  .xcslvn-news{grid-template-columns:1fr}
  .xcslvn-sets{grid-template-columns:1fr}
  .xcslvn-grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .xcslvn-era{grid-template-columns:repeat(2,1fr)}
  .xcslvn-lead{font-size:14.5px}
}
@media (max-width:520px){
  .xcslvn-kpis,.xcslvn-chans,.xcslvn-shield,.xcslvn-foot-grid{grid-template-columns:1fr}
  .xcslvn-era{grid-template-columns:1fr}
  .xcslvn-greet h1{font-size:26px}
  .xcslvn-greet p{font-size:14.5px}
  .xcslvn-rank li{grid-template-columns:auto 1fr;row-gap:6px}
  .xcslvn-rank u{grid-column:2;justify-self:start}
  .xcslvn-btn{width:100%}
}