/* ============================================================
   vibecoding · 网页实验室 — style.css
   纯静态、无外部依赖、暗色主题
   ============================================================ */
:root{
  --bg:#0b0f14;
  --bg2:#0e141c;
  --card:#151d27;
  --card2:#1a2431;
  --line:#25313f;
  --line2:#2f3d4e;
  --tx:#e6edf5;
  --tx2:#9fb0c3;
  --tx3:#6b7f95;
  --acc:#22d3ee;
  --acc2:#a78bfa;
  --grad:linear-gradient(135deg,#22d3ee 0%,#a78bfa 100%);
  --red:#ff7875;
  --grn:#00b96b;
  --amb:#faad14;
  --mono:ui-monospace,"Cascadia Mono","JetBrains Mono","SF Mono",Consolas,"Liberation Mono",monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --r:14px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--tx);
  font:15px/1.65 var(--sans);
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
::selection{background:rgba(34,211,238,.28)}
a{color:inherit;text-decoration:none}
.mono{font-family:var(--mono)}
.dim{color:var(--tx3)}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}

/* ---------- 顶栏 ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  background:rgba(11,15,20,.82);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.bar{display:flex;align-items:center;justify-content:space-between;height:56px}
.brand{display:flex;align-items:center;gap:9px;font-family:var(--mono);font-weight:700;font-size:17px;letter-spacing:.2px}
.brand .mark{flex:none}
.brand span{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.topbar nav{display:flex;gap:4px}
.topbar nav a{
  padding:6px 13px;border-radius:8px;font-size:13.5px;color:var(--tx2);
  transition:color .15s,background .15s;
}
.topbar nav a:hover{color:var(--tx);background:var(--card2)}
.topbar nav a.on{color:var(--tx);background:var(--card2)}
.topbar nav a.on::before{content:'';display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--acc);margin-right:7px;vertical-align:1px}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  padding:74px 0 46px;
  overflow:hidden;
}
.hero::before{
  content:'';position:absolute;inset:0;
  background-image:radial-gradient(circle,#1b2634 1px,transparent 1px);
  background-size:22px 22px;
  -webkit-mask-image:radial-gradient(ellipse 75% 70% at 50% 30%,#000 30%,transparent 75%);
  mask-image:radial-gradient(ellipse 75% 70% at 50% 30%,#000 30%,transparent 75%);
  opacity:.55;pointer-events:none;
}
.hero::after{
  content:'';position:absolute;left:50%;top:-140px;transform:translateX(-50%);
  width:640px;height:320px;border-radius:50%;
  background:radial-gradient(ellipse,rgba(34,211,238,.10),rgba(167,139,250,.06) 45%,transparent 70%);
  pointer-events:none;
}
.kicker{font-size:12.5px;color:var(--acc);letter-spacing:.14em;margin-bottom:14px;opacity:.9}
.hero h1{
  font-size:clamp(30px,5vw,46px);
  line-height:1.22;font-weight:800;letter-spacing:.01em;
  margin-bottom:18px;
}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.sub{color:var(--tx2);font-size:16px;max-width:640px;margin-bottom:26px}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:34px}
.btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:9px 18px;border-radius:10px;font-size:14px;font-weight:600;
  border:1px solid var(--line2);color:var(--tx);background:var(--card);
  transition:transform .15s,border-color .15s,background .15s;
  cursor:pointer;
}
.btn:hover{transform:translateY(-1px);border-color:var(--acc)}
.btn.primary{
  background:var(--grad);border:none;color:#06121a;
}
.btn.primary:hover{filter:brightness(1.1)}
.btn.small{padding:6px 13px;font-size:13px;font-weight:500}
.stats{
  display:flex;gap:22px;flex-wrap:wrap;
  color:var(--tx3);font-size:13px;
  border-top:1px dashed var(--line);padding-top:18px;
}
.stats b{color:var(--tx);font-weight:700}
.stats span{display:flex;align-items:center;gap:6px}

/* ---------- 工具栏 ---------- */
.toolbar{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  margin:8px 0 22px;
}
#q{
  flex:1 1 240px;min-width:220px;
  background:var(--card);border:1px solid var(--line);border-radius:10px;
  color:var(--tx);font-size:14px;padding:9px 14px;
  outline:none;transition:border-color .15s;
  font-family:var(--sans);
}
#q::placeholder{color:var(--tx3)}
#q:focus{border-color:var(--acc)}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{
  font-family:var(--mono);font-size:12px;
  padding:5px 11px;border-radius:999px;
  background:var(--card);border:1px solid var(--line);color:var(--tx2);
  cursor:pointer;transition:all .15s;white-space:nowrap;
}
.chip:hover{border-color:var(--acc);color:var(--tx)}
.chip.on{background:rgba(34,211,238,.12);border-color:var(--acc);color:var(--acc)}

/* ---------- 卡片网格 ---------- */
.grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(300px,1fr));
  gap:18px;
  padding-bottom:70px;
}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  overflow:hidden;display:flex;flex-direction:column;
  opacity:0;animation:fadeUp .5s ease forwards;
  transition:transform .18s,border-color .18s,box-shadow .18s;
}
.card:hover{
  transform:translateY(-3px);
  border-color:var(--line2);
  box-shadow:0 12px 32px -12px rgba(0,0,0,.6),0 0 0 1px rgba(34,211,238,.12);
}
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.thumb{
  position:relative;aspect-ratio:16/10;
  background:linear-gradient(135deg,#131b26,#1a2431);
  border-bottom:1px solid var(--line);
  overflow:hidden;
}
.thumb .sk{
  position:absolute;inset:0;
  background:linear-gradient(110deg,#131b26 30%,#1c2836 50%,#131b26 70%);
  background-size:200% 100%;
  animation:shine 1.4s linear infinite;
}
@keyframes shine{to{background-position:-200% 0}}
.thumb iframe{
  position:absolute;top:0;left:0;
  width:400%;height:400%;
  transform:scale(.25);transform-origin:0 0;
  border:0;background:var(--bg);
  pointer-events:none;
}
.card-body{padding:14px 16px 16px;display:flex;flex-direction:column;gap:8px;flex:1}
.card-title{font-size:15.5px;font-weight:700;line-height:1.4}
.card:hover .card-title{color:var(--acc)}
.card-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:12px;color:var(--tx3)}
.tag{
  font-family:var(--mono);font-size:11px;
  padding:2px 8px;border-radius:999px;
  background:rgba(167,139,250,.10);color:var(--acc2);
  border:1px solid rgba(167,139,250,.22);
}
.card-sum{
  font-size:13px;color:var(--tx2);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.empty{
  grid-column:1/-1;text-align:center;color:var(--tx3);
  padding:60px 0;font-size:14px;line-height:2;
}

/* ---------- 详情页 ---------- */
.postwrap{padding:34px 0 60px}
.posthead{margin-bottom:20px}
.ptitle-row{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;flex-wrap:wrap}
.posthead h1{font-size:26px;font-weight:800;line-height:1.3}
.posthead .card-meta{margin:10px 0 0}
.psum{color:var(--tx2);font-size:14.5px;margin-top:12px;max-width:760px}
.frame-wrap{
  border:1px solid var(--line);border-radius:var(--r);
  overflow:hidden;background:var(--bg2);
  box-shadow:0 18px 50px -20px rgba(0,0,0,.7);
}
.frame-wrap iframe{
  display:block;width:100%;
  height:calc(100vh - 250px);min-height:540px;
  border:0;background:#fff;
}
.miss{padding:90px 0;text-align:center}

/* ---------- 关于页 ---------- */
.doc{padding:44px 0 70px;max-width:820px}
.doc h1{font-size:28px;font-weight:800;margin-bottom:8px}
.doc .lead{color:var(--tx2);margin-bottom:36px}
.doc h2{
  font-size:18px;font-weight:700;margin:38px 0 14px;
  padding-left:12px;border-left:3px solid var(--acc);
}
.doc p{color:var(--tx2);margin-bottom:12px}
.doc p b,.doc li b{color:var(--tx)}
.doc ul,.doc ol{color:var(--tx2);margin:0 0 14px 20px}
.doc li{margin-bottom:7px}
.doc code{
  font-family:var(--mono);font-size:12.5px;
  background:var(--card2);border:1px solid var(--line);
  padding:2px 7px;border-radius:6px;color:var(--acc);
}
.doc pre{
  background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:14px 16px;overflow-x:auto;margin-bottom:14px;
  font-family:var(--mono);font-size:12.5px;line-height:1.7;color:var(--tx2);
}
.doc pre code{background:none;border:none;padding:0;color:inherit}
.doc pre .c{color:var(--tx3)}
.doc table{width:100%;border-collapse:collapse;margin-bottom:14px;font-size:13.5px}
.doc th,.doc td{border:1px solid var(--line);padding:8px 12px;text-align:left}
.doc th{background:var(--card2);color:var(--tx);font-weight:600}
.doc td{color:var(--tx2)}
.doc td code{font-size:12px}

/* ---------- 页脚 ---------- */
footer{
  border-top:1px solid var(--line);
  padding:26px 0 34px;
  color:var(--tx3);font-size:12.5px;
}
footer .wrap{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}
footer .mono{color:var(--tx2)}

/* ---------- 响应式 ---------- */
@media (max-width:640px){
  .hero{padding:52px 0 36px}
  .frame-wrap iframe{height:calc(100vh - 300px);min-height:460px}
  .stats{gap:14px}
  .topbar nav a{padding:6px 9px;font-size:13px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
}