body { font-family: 'Segoe UI', Tahoma, sans-serif; margin:0; background:#f4f6fa; color:#222; transition: background 0.3s, color 0.3s; }
body.dark { background:#121212; color:#f1f1f1; }
header { display:flex; justify-content:space-between; align-items:center; padding:12px 20px; background:#fff; box-shadow:0 2px 6px rgba(0,0,0,0.1); position:sticky; top:0; z-index:1000; transition: background 0.3s; }
body.dark header { background:#1e1e1e; }
header h1 { font-size:20px; margin:0; }
header button { border:none; background:none; cursor:pointer; font-size:18px; color:#555; }
body.dark header button { color:#ddd; }
nav { display:flex; overflow-x:auto; gap:8px; padding:10px; background:#fff; box-shadow:0 2px 4px rgba(0,0,0,0.05); transition: background 0.3s; }
body.dark nav { background:#1e1e1e; }
nav button { border:none; padding:8px 14px; border-radius:20px; background:#eee; font-size:14px; cursor:pointer; transition: all 0.2s; white-space:nowrap; }
nav button:hover { transform:scale(1.05); }
nav button.active { background:#4f46e5; color:#fff; }
body.dark nav button { background:#333; color:#f1f1f1; }
main { padding:16px; max-width:900px; margin:auto; animation: fadeIn 0.5s ease; }
section { display:none; background:#fff; padding:18px; border-radius:12px; box-shadow:0 4px 10px rgba(0,0,0,0.05); animation: fadeSlide 0.4s ease; transition: background 0.3s; margin-bottom:20px; }
body.dark section { background:#1e1e1e; }
section.active { display:block; }
h2 { margin-top:0; font-size:18px; display:flex; align-items:center; gap:8px; }
.timeline { overflow-x:auto; display:flex; gap:14px; padding:14px 0; }
.event { flex:0 0 200px; background:#fff; border:1px solid #ddd; border-radius:10px; padding:10px; cursor:pointer; transition: transform 0.3s, box-shadow 0.3s, background 0.3s; }
body.dark .event { background:#2a2a2a; border-color:#444; }
.event:hover { transform:translateY(-6px); box-shadow:0 6px 14px rgba(0,0,0,0.15); }
.event.active { border-color:#4f46e5; box-shadow:0 0 0 2px #4f46e5 inset; }
.event .date { font-size:12px; color:#666; }
body.dark .event .date { color:#bbb; }
.event .title { font-weight:bold; font-size:15px; margin-top:6px; }
.detail { margin-top:14px; background:#fff; padding:14px; border-radius:10px; box-shadow:0 4px 10px rgba(0,0,0,0.05); transition: background 0.3s; animation: fadeSlide 0.4s ease; }
body.dark .detail { background:#1e1e1e; }
footer { margin-top:20px; text-align:center; color:#777; font-size:13px; }

@keyframes fadeIn { from{opacity:0;} to{opacity:1;} }
@keyframes fadeSlide { from{opacity:0; transform:translateY(10px);} to{opacity:1; transform:translateY(0);} }

/* Responsive */
@media (min-width: 768px) {
  header h1 { font-size:24px; }
  nav { justify-content:center; }
  nav button { font-size:15px; }
}