:root{
  --bg: #0b0f14;
  --panel: #0f1722;
  --panel2: #121c2a;
  --text: #e6edf3;
  --muted: #9fb0c3;
  --link: #7aa2ff;
  --border: rgba(255,255,255,.10);
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 14px;
}

*{ box-sizing: border-box; }

html, body{
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

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

.topbar{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11,15,20,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 16px 14px 12px;
}

.brand h1{
  margin: 0 0 6px;
  font-size: clamp(26px, 4vw, 44px);
  letter-spacing: .2px;
}

.subtitle{
  margin: 0 0 12px;
  color: var(--muted);
}

.searchRow{
  display: flex;
  gap: 10px;
  align-items: center;
}

#searchInput{
  flex: 1;
  background: rgba(255,255,255,.06);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 12px;
  font-size: 16px;
  outline: none;
}

#searchInput::placeholder{
  color: rgba(230,237,243,.55);
}

#clearBtn{
  background: rgba(255,255,255,.06);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 12px;
  font-size: 14px;
}

.layout{
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 14px;
  padding: 14px;
  max-width: 1400px;
  margin: 0 auto;
}

.left, .right{
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.panelTitle{
  padding: 12px 14px;
  font-weight: 650;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,.04);
}

.toc{
  padding: 10px 12px 18px;
  max-height: calc(100vh - 220px);
  overflow: auto;
}

.toc .groupTitle{
  color: var(--muted);
  font-weight: 650;
  margin: 14px 6px 8px;
}

.toc a{
  display: block;
  padding: 8px 10px;
  margin: 4px 2px;
  border-radius: 10px;
  border: 1px solid transparent;
}

.toc a:hover{
  background: rgba(255,255,255,.06);
  border-color: var(--border);
}

.toc a.active{
  background: rgba(122,162,255,.14);
  border-color: rgba(122,162,255,.35);
}

.content{
  padding: 14px 16px 90px;
  background: var(--panel2);
  min-height: 420px;
}

.termTitle{
  margin: 6px 0 8px;
  font-size: 28px;
}

.termMeta{
  color: var(--muted);
  margin: 0 0 12px;
}

.termBody{
  line-height: 1.55;
  white-space: pre-wrap;
}

.emptyState{
  color: var(--muted);
  padding: 10px 0;
}

.oskWrap{
  position: sticky;
  bottom: 0;
  z-index: 60;
  background: rgba(11,15,20,.92);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.osk{
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 8px;
  padding: 10px 10px 14px;
  max-width: 1400px;
  margin: 0 auto;
}

.osk button{
  padding: 10px 6px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.06);
  color: var(--text);
  font-size: 14px;
}

.osk button:active{
  transform: translateY(1px);
}

/* Mobile: one column, no skinny definition strip */
@media (max-width: 900px){
  .layout{
    grid-template-columns: 1fr;
    padding: 10px;
  }
  .toc{
    max-height: none;
  }
}