:root{
  color-scheme: dark;
  --wrap: 1180px;
  --ink: #000000;
  --panel: #0a0a0a;
  --panel-2: #121212;
  --line: #14181f;
  --line-2: #1d3358;
  --txt: #cdd7e5;
  --dim: #8d9bb0;
  --blue: #4d7cff;
  --cyan: #7ce0ff;
  --r: 4px;
}

*,*::before,*::after{box-sizing:border-box;}

html{
  scroll-behavior:smooth;
  background:#000;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:var(--ink);
  color:var(--txt);
  font-family:'Work Sans','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,.brand,.f-name{
  font-family:'Outfit','Work Sans','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
}

a{color:var(--cyan);text-decoration:none;}
a:focus-visible,button:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;}
img{max-width:100%;}

/* ---------- 顶栏 ---------- */
.top{
  position:sticky;
  top:0;
  z-index:30;
  background:rgba(0,0,0,.92);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid #101010;
}

.tick{
  margin:0;
  padding:7px 20px;
  font-size:13px;
  letter-spacing:.22em;
  color:#61708a;
  border-bottom:1px solid #0d0d0d;
  display:flex;
  gap:14px;
  white-space:nowrap;
  overflow:hidden;
}
.tick span{color:#31405a;}

.bar{
  max-width:var(--wrap);
  margin:0 auto;
  padding:6px 20px;
  display:flex;
  align-items:center;
  gap:14px;
  flex-wrap:wrap;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:4px 0;
  color:#fff;
  font-weight:600;
  font-size:17px;
  letter-spacing:.06em;
  flex:0 0 auto;
}
.brand::before{
  content:"";
  width:12px;
  height:12px;
  border-radius:2px;
  background:linear-gradient(135deg,var(--blue),var(--cyan));
  box-shadow:0 0 14px rgba(77,124,255,.85);
}

.top nav{margin-left:auto;min-width:0;}
.top nav ul{
  display:flex;
  flex-wrap:wrap;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}

.nv{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:6px 11px;
  border-radius:3px;
  color:#b3c0d2;
  font-size:16px;
  border-bottom:1px solid transparent;
  transition:color .2s,background .2s,border-color .2s;
}
.nv .ic{
  width:5px;
  height:5px;
  background:#3c4a61;
  border-radius:1px;
  transition:background .2s,box-shadow .2s;
}
.nv:hover,.nv:focus-visible{
  color:#fff;
  background:#0b0f16;
  border-bottom-color:var(--blue);
}
.nv:hover .ic{background:var(--cyan);box-shadow:0 0 8px var(--cyan);}

/* ---------- 首屏 ---------- */
.hero{
  max-width:var(--wrap);
  margin:0 auto;
  padding:clamp(26px,5.5vw,62px) 20px;
  min-height:70vh;
  display:grid;
  grid-template-columns:minmax(0,.95fr) minmax(0,1fr);
  align-items:center;
  gap:clamp(24px,4vw,56px);
}

.copy{text-align:right;}

.copy h1{
  margin:0;
  font-size:clamp(29px,4.4vw,54px);
  line-height:1.12;
  font-weight:600;
  letter-spacing:-.015em;
  color:#fff;
  text-shadow:0 0 26px rgba(77,124,255,.26);
}
.copy h1::after{
  content:"";
  display:block;
  width:86px;
  height:2px;
  margin:22px 0 0 auto;
  background:linear-gradient(90deg,transparent,var(--cyan));
}

.lead{
  margin:20px 0 0;
  color:var(--dim);
  font-size:16px;
  line-height:1.85;
}

.art{
  position:relative;
  margin:0;
  min-height:clamp(240px,44vh,430px);
}
.art::before{
  content:"";
  position:absolute;
  right:0;
  bottom:0;
  width:86%;
  height:86%;
  background:radial-gradient(circle at 72% 82%,rgba(77,124,255,.2),transparent 64%);
  pointer-events:none;
}
.art img{
  position:absolute;
  display:block;
  object-fit:cover;
  border-radius:var(--r);
  background:#0d131c;
}
.art img.a{
  left:0;
  top:0;
  width:72%;
  height:78%;
  border:1px solid #1b2740;
}
.art img.b{
  right:0;
  bottom:0;
  width:56%;
  height:52%;
  border:1px solid #294064;
  box-shadow:0 0 0 7px #000,0 22px 44px rgba(0,0,0,.75);
}

/* ---------- 正文区 ---------- */
.article{
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 20px 76px;
  display:grid;
  grid-template-columns:220px minmax(0,1fr);
  gap:clamp(24px,4vw,46px);
}

.side{
  position:sticky;
  top:120px;
  align-self:start;
  border-left:2px solid var(--line-2);
  padding-left:18px;
  max-height:calc(100vh - 150px);
  overflow:auto;
}
.side h2{
  margin:0 0 8px;
  font-size:18px;
  font-weight:600;
  color:#fff;
  letter-spacing:.04em;
}
.side .subtitle{
  margin:0 0 16px;
  font-size:13px;
  letter-spacing:.18em;
  color:#5f6f88;
}
.side-list{list-style:none;margin:0;padding:0;}
.side-list a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:6px 0;
  font-size:16px;
  color:#93a2b8;
  border-bottom:1px solid #0f1318;
  transition:color .2s;
}
.side-list a:hover{color:#fff;}

.content{
  min-width:0;
  font-size:17px;
  line-height:1.85;
}
.content div{
  background:var(--panel);
  border-radius:var(--r);
  border-bottom:2px solid var(--line-2);
  padding:clamp(20px,3vw,32px);
  margin:0 0 24px;
  scroll-margin-top:120px;
}
.content h2{
  font-size:clamp(21px,2.5vw,28px);
  line-height:1.3;
  color:#fff;
  margin:0 0 14px;
  letter-spacing:-.01em;
}
.content h3{
  font-size:19px;
  color:#e6eefb;
  margin:22px 0 10px;
}
.content p{margin:0 0 15px;color:#c2cddd;}
.content ul,.content ol{margin:0 0 16px;padding-left:1.25em;}
.content li{margin:0 0 8px;}
.content a{color:#8fb8ff;border-bottom:1px solid var(--line-2);}
.content strong{color:#fff;}
.content blockquote{
  margin:18px 0;
  padding:12px 18px;
  border-left:2px solid var(--blue);
  background:#0c121b;
  color:#b9c6d8;
  border-radius:0 var(--r) var(--r) 0;
}
.content img{border-radius:var(--r);display:block;height:auto;}
.content hr{border:0;border-top:1px solid #151a21;margin:26px 0;}

.art-wide{
  grid-column:1/-1;
  margin:6px 0 0;
  padding-top:20px;
  border-top:1px solid #12161c;
}
.art-wide img{width:100%;height:auto;display:block;border-radius:var(--r);}
.art-wide figcaption{
  font-size:13px;
  letter-spacing:.18em;
  color:#5f6f88;
  padding-top:12px;
}

/* ---------- 页脚 ---------- */
footer{
  max-width:var(--wrap);
  margin:0 auto;
  padding:48px 20px 34px;
  border-top:1px solid var(--line);
  display:grid;
  grid-template-columns:minmax(0,.9fr) minmax(0,1.4fr) minmax(0,.9fr);
  gap:26px;
}

.f-name{
  margin:0;
  font-size:19px;
  letter-spacing:.06em;
  color:#fff;
}

.f-go{
  margin:0;
  font-size:clamp(18px,2.2vw,24px);
  line-height:1.6;
  color:#fff;
}
.f-go a{color:#8fb8ff;border-bottom:2px solid #1b3050;padding-bottom:2px;}
.f-go span{color:#33415a;}

.f-more{
  margin:0;
  font-size:16px;
  display:grid;
  gap:2px;
  align-content:start;
  justify-items:end;
}
.f-more a{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  min-height:40px;
  color:#93a2b8;
}
.f-more a:hover{color:#fff;}

.f-copy{
  grid-column:1/-1;
  border-top:1px solid #12161c;
  padding-top:16px;
  font-size:13px;
  letter-spacing:.14em;
  color:#5f6f88;
}

/* ---------- 动效 ---------- */
html.js .rv{opacity:0;transform:translateY(14px);}
html.js .rv.in{
  opacity:1;
  transform:none;
  transition:opacity .5s ease var(--d,0ms),transform .5s ease var(--d,0ms);
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  html.js .rv{opacity:1;transform:none;transition:none;}
}

/* ---------- 窄屏 ---------- */
@media (max-width:880px){
  .tick{display:none;}

  .bar{flex-wrap:nowrap;padding:4px 16px;}
  .top nav{
    width:100%;
    margin-left:0;
    overflow-x:auto;
    -webkit-overflow-scrolling:touch;
  }
  .top nav ul{flex-wrap:nowrap;}
  .nv{padding:6px 10px;white-space:nowrap;}

  .hero{
    grid-template-columns:minmax(0,1fr);
    min-height:0;
    padding:18px 16px 30px;
  }
  .art{min-height:clamp(170px,34vh,260px);max-width:560px;width:100%;}
  .copy{padding-top:22px;}
  .copy h1{font-size:clamp(27px,7.6vw,38px);}

  .article{
    grid-template-columns:minmax(0,1fr);
    padding:0 16px 58px;
  }
  .side{
    position:static;
    max-height:none;
    overflow:visible;
    border-left:0;
    border-top:1px solid var(--line-2);
    padding:14px 0 4px;
  }
  .side-list{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    column-gap:14px;
  }
  .content{font-size:16.5px;}
  .content div{scroll-margin-top:104px;}

  footer{
    grid-template-columns:minmax(0,1fr);
    padding:38px 16px 28px;
    gap:16px;
  }
  .f-more{justify-items:start;}
  .f-more a{justify-content:flex-start;}
  .f-copy{grid-column:auto;}
}

@media (max-width:420px){
  .art{min-height:170px;}
  .content div{padding:18px 16px;}
}

button[aria-expanded]{min-width:44px;min-height:44px}