/* ...existing styles... */
:root {
  --bg: #ffffff;
  --fg: #0b0b0c;
  --muted: #6b6f76;
  --card: #fafafa;
  --border: #e8e8ec;
  --accent: #0d6efd;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
}
:root.dark {
  --bg: #0e0f12;
  --fg: #f2f3f5;
  --muted: #9aa0a6;
  --card: #15171c;
  --border: #2a2e36;
  --accent: #4da3ff;
  --shadow: 0 6px 28px rgba(0,0,0,0.5);
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Noto Sans", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}
/* ...existing styles... */
.site-header {
  position: sticky; top: 0; z-index: 10;
  display: grid; grid-template-columns: 1fr auto auto;
  gap: 12px; align-items: center;
  padding: 14px 18px; background: var(--bg); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand .logo {
  display: grid; place-items: center;
  width: 34px; height: 34px; border-radius: 8px; background: var(--fg); color: var(--bg); font-weight: 700;
}
.brand h1 { font-size: 18px; margin: 0; }
.nav { display: flex; gap: 8px; flex-wrap: wrap; }
.nav-btn {
  background: transparent; border: 1px solid var(--border); color: var(--fg);
  padding: 8px 10px; border-radius: 10px; cursor: pointer;
}
.nav-btn:is(:hover,.is-active){ border-color: var(--fg); }
.tools { display: flex; gap: 8px; align-items: center; }
.search input {
  padding: 8px 12px; border-radius: 10px; border: 1px solid var(--border); width: min(44vw, 420px);
  background: var(--card); color: var(--fg);
}
#toggle-theme { border: 1px solid var(--border); background: var(--card); border-radius: 10px; padding: 8px 10px; cursor: pointer; }

main { max-width: 1200px; margin: 0 auto; padding: 20px; }
.view { display: none; }
.view.is-active { display: block; animation: fade 240ms ease; }
@keyframes fade { from{opacity:.3; transform: translateY(4px)} to{opacity:1; transform:none} }
.lead { color: var(--muted); max-width: 70ch; }

.home-grid, .grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); margin-top: 16px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 14px; box-shadow: var(--shadow);
}
.card.link { cursor: pointer; transition: transform .15s ease, box-shadow .15s ease; }
.card.link:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(0,0,0,0.12); }

.view-header { display: flex; gap: 12px; align-items: center; justify-content: space-between; flex-wrap: wrap; margin: 12px 0; }
.controls { display: flex; gap: 8px; align-items: center; }
.controls select, .controls input[type="range"], .controls button {
  border: 1px solid var(--border); background: var(--card); color: var(--fg);
  border-radius: 10px; padding: 8px 10px;
}

/* Timeline */
.timeline-container { position: relative; overflow-x: auto; white-space: nowrap; padding: 14px; background: var(--card); border: 1px solid var(--border); border-radius: 14px; }
.timeline-row { position: relative; height: 72px; border-left: 3px solid var(--border); margin: 12px 0; }
.timeline-event {
  position: absolute; top: 16px; display: inline-block; border-radius: 10px; padding: 8px 10px;
  background: #111; color: #fff; white-space: nowrap; transform-origin: left center;
}
.timeline-event[data-period="antiguidade"] { background: #334155; }
.timeline-event[data-period="medieval"] { background: #4b5563; }
.timeline-event[data-period="moderna"] { background: #2563eb; }
.timeline-event[data-period="contemporanea"] { background: #0f766e; }
.timeline-event:hover { filter: brightness(1.05); }

/* Dialogs */
.dialog { width: min(720px, 96vw); border: 1px solid var(--border); border-radius: 14px; padding: 0; background: var(--bg); color: var(--fg); }
.dialog article { padding: 18px; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; padding: 12px 18px; border-top: 1px solid var(--border); }

/* Glossary */
.glossary { display: grid; gap: 10px; grid-template-columns: 1fr; }
.glossary dt { font-weight: 700; }
.glossary dd { margin: 0 0 10px 0; color: var(--muted); }

/* Quiz */
.quiz-area { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px; min-height: 140px; }
.quiz-q { font-weight: 600; margin: 0 0 12px; }
.quiz-options { display: grid; gap: 8px; }
.quiz-options button { text-align: left; border: 1px solid var(--border); background: var(--bg); padding: 10px 12px; border-radius: 10px; cursor: pointer; }
.quiz-options button.correct { border-color: #16a34a; background: rgba(22,163,74,.08); }
.quiz-options button.wrong { border-color: #dc2626; background: rgba(220,38,38,.08); }

.quiz-progress { height: 6px; background: var(--border); border-radius: 999px; overflow: hidden; margin: 10px 0 12px; }
.quiz-progress > i { display: block; height: 100%; width: 0%; background: var(--accent); transition: width .25s ease; }

/* Regions */
.grid.regions .card h3 { margin: 6px 0; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 18px; display: flex; gap: 10px; justify-content: space-between; align-items: center; color: var(--muted); }

@media (max-width: 720px) {
  .site-header { grid-template-columns: 1fr; }
  .search input { width: 100%; }
}