:root{
  --bg: #0b1020;
  --card: rgba(255,255,255,.06);
  --card2: rgba(255,255,255,.09);
  --text: rgba(255,255,255,.92);
  --muted: rgba(255,255,255,.68);
  --line: rgba(255,255,255,.12);
  --brand: #7c5cff; /* 主题色：想换就改这里 */
  --brand2:#22d3ee;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 18px;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC","Microsoft YaHei", Arial;
  color:var(--text);
  background:
    radial-gradient(900px 500px at 10% 10%, rgba(124,92,255,.22), transparent 60%),
    radial-gradient(900px 500px at 90% 20%, rgba(34,211,238,.18), transparent 60%),
    radial-gradient(800px 600px at 50% 100%, rgba(124,92,255,.12), transparent 60%),
    var(--bg);
  min-height:100vh;
}
a{color:inherit; text-decoration:none}
.wrap{max-width:1100px; margin:0 auto; padding:20px;}
.topbar{
  display:flex; gap:14px; align-items:center; justify-content:space-between;
  padding:14px 16px; border:1px solid var(--line); background:rgba(255,255,255,.04);
  border-radius:var(--radius); backdrop-filter: blur(10px); box-shadow:var(--shadow);
  position:sticky; top:12px; z-index:10;
}
.brand{display:flex; gap:10px; align-items:center}
.logo{
  width:38px; height:38px; border-radius:12px;
  background: linear-gradient(135deg, var(--brand), var(--brand2));
  display:grid; place-items:center; font-weight:800;
  box-shadow: 0 12px 30px rgba(124,92,255,.25);
  user-select:none;
}
.brand h1{font-size:16px; margin:0; line-height:1.15}
.brand p{margin:0; font-size:12px; color:var(--muted)}
.search{
  display:flex; gap:10px; align-items:center; flex:1; justify-content:flex-end;
}
.search input{
  width:min(420px, 100%);
  padding:10px 12px; border-radius:14px;
  border:1px solid var(--line);
  background:rgba(0,0,0,.22);
  color:var(--text);
  outline:none;
}
.search input::placeholder{color:rgba(255,255,255,.5)}
.pill{
  padding:8px 10px; border-radius:999px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.05);
  color:var(--muted);
  font-size:12px;
  display:none;
  white-space:nowrap;
}

.hero{margin:22px 0 14px; display:grid; gap:14px; grid-template-columns: 1.35fr .65fr;}
@media (max-width: 900px){ .hero{grid-template-columns:1fr} .pill{display:none} }
.heroCard{
  border:1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  padding:18px 18px;
  background: linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.03));
  box-shadow:var(--shadow);
}
.heroTitle{
  display:flex; gap:10px; align-items:flex-start; justify-content:space-between;
}
.heroTitle h2{margin:0; font-size:22px; letter-spacing:.2px}
.heroTitle small{color:var(--muted)}
.heroCard p{margin:10px 0 0; color:var(--muted); line-height:1.6}
.ctaRow{display:flex; gap:10px; flex-wrap:wrap; margin-top:14px}
.btn{
  padding:10px 12px; border-radius:14px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.05);
  display:inline-flex; gap:8px; align-items:center;
  transition:.15s transform, .15s background, .15s border-color;
  user-select:none;
}
.btn:hover{transform: translateY(-1px); background:rgba(255,255,255,.07); border-color:rgba(255,255,255,.18)}
.btn.primary{
  background: linear-gradient(135deg, rgba(124,92,255,.95), rgba(34,211,238,.85));
  border-color: rgba(255,255,255,.18);
  color:#071022;
  font-weight:700;
}
.grid{display:grid; gap:14px; grid-template-columns: 1fr 1fr;}
@media (max-width: 900px){ .grid{grid-template-columns:1fr} }
.section{
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(255,255,255,.04);
  box-shadow:var(--shadow);
  overflow:hidden;
}
.sectionHeader{
  padding:14px 16px;
  display:flex; align-items:center; justify-content:space-between; gap:10px;
  border-bottom:1px solid var(--line);
  background:rgba(0,0,0,.12);
}
.sectionHeader h3{margin:0; font-size:14px; letter-spacing:.2px}
.sectionHeader span{color:var(--muted); font-size:12px}
.sectionBody{padding:14px 16px}
.cards{display:grid; gap:10px; grid-template-columns: 1fr 1fr;}
@media (max-width: 520px){ .cards{grid-template-columns:1fr} }
.card{
  border:1px solid var(--line);
  border-radius:16px;
  background:rgba(255,255,255,.05);
  padding:12px;
  transition:.15s transform, .15s background;
  display: block; /* ensure links are block elements */
}
.card:hover{transform: translateY(-1px); background:rgba(255,255,255,.07)}
.cardTop{display:flex; align-items:center; justify-content:space-between; gap:10px}
.tag{
  font-size:11px; color:rgba(255,255,255,.75);
  padding:4px 8px; border-radius:999px;
  background:rgba(124,92,255,.18);
  border:1px solid rgba(124,92,255,.25);
  white-space:nowrap;
}
.card h4{margin:8px 0 4px; font-size:14px}
.card p{margin:0; color:var(--muted); font-size:12px; line-height:1.55}
.list{display:grid; gap:10px}
details{
  border:1px solid var(--line);
  border-radius:16px;
  padding:10px 12px;
  background:rgba(255,255,255,.04);
}
summary{
  cursor:pointer;
  list-style:none;
  display:flex; align-items:center; justify-content:space-between; gap:10px;
  font-weight:650;
}
summary::-webkit-details-marker{display:none}
.meta{color:var(--muted); font-size:12px; font-weight:500}
.content{margin-top:10px; color:var(--muted); font-size:13px; line-height:1.65}
.codeRow{display:flex; gap:10px; flex-wrap:wrap; margin-top:10px}
.code{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size:12px;
  padding:8px 10px;
  border-radius:12px;
  border:1px dashed rgba(255,255,255,.20);
  background:rgba(0,0,0,.22);
  color:rgba(255,255,255,.86);
  display:inline-flex; gap:8px; align-items:center;
}
.copy{
  border:1px solid var(--line);
  background:rgba(255,255,255,.05);
  border-radius:10px;
  padding:6px 8px;
  color:var(--text);
  cursor:pointer;
}
.copy:hover{background:rgba(255,255,255,.08)}
.footer{
  margin:18px 0 10px;
  color:rgba(255,255,255,.55);
  font-size:12px;
  display:flex; justify-content:space-between; gap:10px; flex-wrap:wrap;
}
.hidden{display:none !important}
.hint{font-size:12px; color:var(--muted); margin:0}
/* New utility for breadcrumbs or back buttons */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 14px;
    color: var(--muted);
    margin-bottom: 20px;
}
.back-link:hover {
    color: var(--text);
}