:root{
  --bg:#0b1220;
  --panel:#0f1a2f;
  --card:#101f3a;
  --text:#e8eefc;
  --muted:#b6c3e6;
  --link:#7cb7ff;
  --accent:#4dd4ac;
  --warn:#ffcc66;
  --border:rgba(255,255,255,.12);
  --shadow:0 10px 30px rgba(0,0,0,.35);
  --radius:14px;
  --max:1100px;
  --code:#0a152a;
}

[data-theme="light"]{
  --bg:#f6f7fb;
  --panel:#ffffff;
  --card:#ffffff;
  --text:#0b1220;
  --muted:#4a5568;
  --link:#0b6bcb;
  --accent:#0a8f74;
  --warn:#b45309;
  --border:rgba(11,18,32,.12);
  --shadow:0 10px 30px rgba(11,18,32,.10);
  --code:#f1f5f9;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  background:var(--bg);
  color:var(--text);
  line-height:1.55;
}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
kbd{
  background:var(--code);
  border:1px solid var(--border);
  padding:.15rem .35rem;
  border-radius:6px;
  font-size:.9em;
}

.topbar{
  position:sticky; top:0; z-index:50;
  background:linear-gradient(180deg, rgba(0,0,0,.35), rgba(0,0,0,0));
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--border);
}
.topbar .inner{
  max-width:var(--max);
  margin:0 auto;
  padding:14px 18px;
  display:flex; align-items:center; gap:14px; justify-content:space-between;
}
.brand{
  display:flex; flex-direction:column; gap:2px;
}
.brand .name{font-weight:800; letter-spacing:.2px}
.brand .tag{font-size:.88rem;color:var(--muted)}
.actions{display:flex; gap:10px; align-items:center}
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:10px 12px;
  border:1px solid var(--border);
  border-radius:12px;
  background:rgba(255,255,255,.06);
  color:var(--text);
  box-shadow:none;
  cursor:pointer;
  user-select:none;
}
.btn:hover{filter:brightness(1.06)}
.btn:active{transform:translateY(1px)}
.pill{
  padding:8px 10px;
  border-radius:999px;
  background:rgba(77,212,172,.12);
  border:1px solid rgba(77,212,172,.22);
  color:var(--text);
  font-size:.9rem;
}

.wrap{
  max-width:var(--max);
  margin:0 auto;
  padding:18px;
  display:grid;
  grid-template-columns: 280px 1fr;
  gap:18px;
}
@media (max-width: 920px){
  .wrap{grid-template-columns:1fr}
}

.sidebar{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:14px;
  height:fit-content;
}
.sidebar h3{
  margin:8px 0 10px;
  font-size:1.05rem;
}
.nav{
  display:flex; flex-direction:column; gap:6px;
}
.nav a{
  display:flex; align-items:center; justify-content:space-between;
  padding:10px 10px;
  border-radius:12px;
  border:1px solid transparent;
  color:var(--text);
}
.nav a small{color:var(--muted)}
.nav a:hover{
  background:rgba(255,255,255,.06);
  border-color:var(--border);
  text-decoration:none;
}
.nav a.active{
  background:rgba(77,212,172,.15);
  border-color:rgba(77,212,172,.35);
}
.nav .group{margin-top:10px; padding-top:10px; border-top:1px solid var(--border)}
.nav .group-title{color:var(--muted); font-weight:700; font-size:.85rem; letter-spacing:.2px; margin:2px 6px 6px}

.content{
  min-width:0;
}
.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:18px;
}
.card + .card{margin-top:16px}
.hero{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap:16px;
}
@media (max-width: 920px){
  .hero{grid-template-columns:1fr}
}
.h-title{font-size:1.6rem; margin:0 0 6px}
.h-sub{color:var(--muted); margin:0 0 12px}
.bullets{margin:0; padding-left:18px}
.grid{
  display:grid; grid-template-columns: repeat(3, 1fr); gap:12px;
}
@media (max-width: 1100px){
  .grid{grid-template-columns: repeat(2, 1fr)}
}
@media (max-width: 640px){
  .grid{grid-template-columns: 1fr}
}
.tile{
  padding:14px;
  border-radius:14px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.04);
}
.tile h4{margin:0 0 6px}
.tile p{margin:0; color:var(--muted); font-size:.95rem}

.section-title{
  margin:0 0 8px;
  font-size:1.2rem;
  display:flex; align-items:center; gap:10px;
}
.badge{
  font-size:.78rem;
  padding:4px 8px;
  border-radius:999px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.06);
  color:var(--muted);
}
.hr{height:1px; background:var(--border); margin:14px 0}

.callout{
  border-left:4px solid var(--accent);
  background:rgba(77,212,172,.10);
  padding:12px 12px 12px 14px;
  border-radius:12px;
}
.callout.warn{border-left-color:var(--warn); background:rgba(255,204,102,.10)}
.callout p{margin:0}
.meta{
  display:flex; flex-wrap:wrap; gap:8px; margin-top:10px
}
.meta a{
  font-size:.9rem;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.04);
}
.meta a:hover{text-decoration:none; filter:brightness(1.06)}
.footer{
  max-width:var(--max);
  margin:28px auto 40px;
  padding:0 18px;
  color:var(--muted);
  font-size:.92rem;
}
details{
  border:1px solid var(--border);
  border-radius:12px;
  padding:10px 12px;
  background:rgba(255,255,255,.03);
}
details summary{cursor:pointer; font-weight:700}
details + details{margin-top:10px}
.table{
  width:100%;
  border-collapse:collapse;
  margin-top:10px;
}
.table th, .table td{
  border:1px solid var(--border);
  padding:10px;
  text-align:left;
  vertical-align:top;
}
.table th{background:rgba(255,255,255,.05)}
.search{
  width:100%;
  padding:11px 12px;
  border-radius:12px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.03);
  color:var(--text);
  outline:none;
}
.search::placeholder{color:rgba(182,195,230,.8)}
.video-grid{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap:12px;
}
@media (max-width: 920px){.video-grid{grid-template-columns: 1fr}}
.video{
  border:1px solid var(--border);
  border-radius:14px;
  overflow:hidden;
  background:rgba(255,255,255,.03);
}
.video .meta{
  padding:10px 12px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:10px;
}
.video iframe{width:100%; aspect-ratio:16/9; border:0}
.small{font-size:.92rem; color:var(--muted)}