:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --text: #152033;
  --muted: #627086;
  --brand: #06327d;
  --accent: #ffd034;
  --line: #dce4f0;
  --shadow: 0 10px 30px rgba(20, 40, 80, .08);
}
body.dark {
  --bg: #0c1320;
  --panel: #111c2e;
  --text: #eef4ff;
  --muted: #a9b8ce;
  --brand: #2b70e4;
  --accent: #ffd034;
  --line: #243650;
  --shadow: none;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.topbar {
  background: linear-gradient(135deg, var(--brand), #0a4aba);
  color: white;
  padding: 28px clamp(16px, 4vw, 56px);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}
.topbar h1 { margin: 0 0 6px; font-size: clamp(26px, 4vw, 44px); letter-spacing: -.03em; }
.topbar p { margin: 0; opacity: .9; }
.layout {
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 22px;
  padding: 22px clamp(12px, 3vw, 40px);
}
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: var(--shadow);
}
.sidebar { padding: 18px; max-height: calc(100vh - 140px); position: sticky; top: 14px; overflow: auto; }
.content { padding: clamp(16px, 3vw, 28px); }
.input {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  border-radius: 14px;
  padding: 13px 14px;
  font-size: 15px;
  outline: none;
}
.input:focus { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(43,112,228,.14); }
.searchbox { display: grid; grid-template-columns: 1fr 210px auto; gap: 12px; margin: 18px 0; }
.primary, .ghost {
  border: 0;
  border-radius: 14px;
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 700;
}
.primary { background: var(--accent); color: #1a1a1a; }
.ghost { background: rgba(255,255,255,.15); color: inherit; border: 1px solid var(--line); }
.notice {
  background: rgba(255,208,52,.16);
  border: 1px solid rgba(255,208,52,.55);
  border-radius: 16px;
  padding: 14px 16px;
  line-height: 1.45;
}
.advanced { margin: 8px 0 14px; color: var(--muted); }
.filters { display: flex; flex-wrap: wrap; gap: 14px; align-items: end; padding: 12px 0; }
.small { width: 110px; margin-top: 6px; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.grid { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 22px; }
.results.empty, .mini-list:empty::before {
  color: var(--muted);
}
.mini-list:empty::before { content: "Sin elementos guardados."; }
.result-card, .toc-item, .mini-item {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
  margin-bottom: 10px;
  background: rgba(255,255,255,.04);
}
.result-card h3 { margin: 0 0 8px; font-size: 18px; }
.result-card p { color: var(--muted); line-height: 1.5; margin: 0 0 12px; }
.badge {
  display: inline-flex;
  gap: 4px;
  align-items: center;
  border-radius: 999px;
  background: rgba(43,112,228,.12);
  color: var(--brand);
  padding: 5px 9px;
  font-size: 12px;
  font-weight: 700;
}
body.dark .badge { color: #bcd3ff; }
mark { background: var(--accent); padding: 0 2px; border-radius: 4px; }
.card-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.card-actions button, .mini-item button {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 10px;
  padding: 7px 9px;
  cursor: pointer;
}
.letters { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.letters button {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 9px;
  padding: 6px 9px;
  cursor: pointer;
}
.toc-list { margin-top: 12px; }
.toc-item { cursor: pointer; }
.toc-item strong { display: block; }
.toc-item span { color: var(--muted); font-size: 13px; }
footer { text-align: center; color: var(--muted); padding: 20px; }
@media (max-width: 980px) {
  .layout, .grid, .searchbox { grid-template-columns: 1fr; }
  .sidebar { position: static; max-height: none; }
}