:root{
  --bg: #0b0e14;
  --panel: #111522;
  --panel-2: #0f1421;
  --text: #e6eaf3;
  --muted: #aab3c5;
  --accent: #7cc4ff;
  --accent-2:#98ffa6;
  --ring: rgba(124,196,255,0.35);
  --card: #111827;
  --card-border: #1f2937;
  --shadow: 0 10px 30px rgba(0,0,0,0.25);
  --radius: 16px;
}

@media (prefers-color-scheme: light){
  :root{
    --bg: #f7f8fb;
    --panel: #ffffff;
    --panel-2:#f3f6fb;
    --text: #0f172a;
    --muted: #4b5563;
    --accent: #2563eb;
    --accent-2:#059669;
    --ring: rgba(37,99,235,0.25);
    --card: #ffffff;
    --card-border: #e5e7eb;
    --shadow: 0 8px 24px rgba(15,23,42,0.08);
  }
}

*{box-sizing: border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
  color: var(--text);
  background: linear-gradient(120deg, var(--bg), var(--panel-2));
}

a{color: var(--accent); text-decoration: none}
a:hover{text-decoration: underline}

.layout{
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  padding: 24px;
  max-width: 1300px;
  margin: 0 auto;
}

.sidebar{
  position: sticky;
  top: 24px;
  height: calc(100dvh - 48px);
  background: var(--panel);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: auto;
}
.sidebar-inner{padding: 16px}
.toc{margin-top: 12px}
.toc a{
  display: block;
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--text);
}
.toc a:hover{background: var(--panel-2)}
.toc .toc-group{margin-bottom: 12px}
.toc .toc-title{
  font-weight: 700;
  margin: 12px 0 6px;
  font-size: 14px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .08em;
}

.main{
  display: grid;
  gap: 24px;
}

.hero{
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: start;
  background: radial-gradient(1200px 300px at 0% -20%, rgba(124,196,255,0.18), transparent), var(--panel);
  border: 1px solid var(--card-border);
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero h1{margin: 0 0 6px}
.subtitle{margin: 0; color: var(--muted)}
.hero-actions{margin-top: 12px; display:flex; gap:10px; flex-wrap: wrap}
.hero-right{display:flex; gap:16px}
.stat{
  background: var(--panel-2);
  border: 1px solid var(--card-border);
  padding: 12px 16px;
  border-radius: 12px;
  text-align: center;
}
.stat-number{display:block; font-weight: 700; font-size: 22px}
.stat-label{font-size:12px; color: var(--muted)}

.controls{
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr auto;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--card-border);
  padding: 16px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.search-wrap{display:flex; gap:10px; align-items:center}
#searchInput{
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  background: var(--panel-2);
  color: var(--text);
  outline: none;
}
#searchInput:focus{box-shadow: 0 0 0 4px var(--ring); border-color: var(--accent)}
.filters-wrap{display:flex; gap:10px; flex-wrap: wrap}
.filter{
  display:flex; gap:8px; align-items:center;
  background: var(--panel-2);
  border: 1px solid var(--card-border);
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--muted);
}

.sections{display: grid; gap: 16px}
.section{
  background: var(--panel);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.section-header{
  display:flex; justify-content: space-between; align-items:center;
  padding: 16px 16px;
  border-bottom: 1px solid var(--card-border);
  cursor: pointer;
}
.section-title{display:flex; align-items:center; gap:10px}
.section-title h2{margin:0; font-size: 18px}
.section-actions{display:flex; gap:10px}
.section-content{padding: 16px 16px 8px; display:none}
.section.open .section-content{display:block}

.subsection{margin-bottom: 18px}
.subsection h3{
  margin: 6px 0 10px;
  font-size: 16px;
  color: var(--muted);
  display:flex; align-items: center; gap: 8px;
}
.subsection h3 .badge{
  background: var(--panel-2);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 12px;
  color: var(--muted);
}

.grid{
  display:grid;
  grid-template-columns: repeat( auto-fit, minmax(260px, 1fr) );
  gap: 12px;
}

.card{
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 14px;
  display:flex; flex-direction: column; gap:8px;
  transition: transform .12s ease, box-shadow .12s ease;
}
.card:hover{
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.22);
}
.card .title{font-weight:600; line-height:1.3}
.card .meta{
  display:flex; gap:8px; flex-wrap:wrap; align-items:center;
  font-size:12px; color: var(--muted);
}
.card .actions{margin-top:auto; display:flex; gap:8px; flex-wrap: wrap}

.btn{
  --_bg: var(--accent);
  --_fg: white;
  appearance: none;
  border: 1px solid transparent;
  padding: 10px 14px;
  line-height: 1;
  border-radius: 10px;
  background: var(--_bg);
  color: var(--_fg);
  cursor: pointer;
}
.btn:hover{filter: brightness(1.05)}
.btn:focus{outline: none; box-shadow: 0 0 0 4px var(--ring)}
.btn.primary{--_bg: var(--accent)}
.btn.secondary{--_bg: var(--panel-2); --_fg: var(--text); border-color: var(--card-border)}
.btn.ghost{--_bg: transparent; --_fg: var(--text); border-color: var(--card-border); background: var(--panel-2)}
.btn.small{padding: 8px 10px; font-size: 13px}

.footer{
  text-align:center;
  color: var(--muted);
  padding: 24px 10px 10px;
}

/* Responsive */
@media (max-width: 980px){
  .layout{grid-template-columns: 1fr}
  .sidebar{order: 2; position: static; height: auto}
  .hero{grid-template-columns: 1fr}
  .controls{grid-template-columns: 1fr}
}