:root {
  --bg: #0d0f14;
  --panel: #121621;
  --card: #161b28;
  --text: #e6e8eb;
  --muted: #a8b0bf;
  --primary: #5b8cff;
  --accent: #8a5bff;
  --danger: #ff5b7a;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 800px at 20% -10%, #0b3e6f55, transparent),
              radial-gradient(1200px 800px at 100% 0%, #6f0b3e33, transparent),
              var(--bg);
  color: var(--text);
}

.app { max-width: 1200px; margin: 0 auto; padding: 24px; }

.app-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.branding h1 { margin: 0; font-size: 28px; font-weight: 700; }
.branding p { margin: 6px 0 0 0; color: var(--muted); font-size: 14px; }

.search-box { display: flex; gap: 8px; }
.search-box input {
  width: 360px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #223047;
  background: #101522;
  color: var(--text);
  outline: none;
}
.search-box button, .calendar-controls button, .filter-btn {
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid #2a3a56;
  background: linear-gradient(180deg, #1a2233, #131a28);
  color: var(--text);
  cursor: pointer;
}
.search-box button:hover, .calendar-controls button:hover, .filter-btn:hover { border-color: var(--primary); }

.content { display: grid; grid-template-columns: 1fr; grid-template-rows: auto 1fr; grid-template-areas: "calendar" "sidebar"; gap: 20px; margin-top: 24px; }

.sidebar { grid-area: sidebar; background: var(--panel); border: 1px solid #20283a; border-radius: 16px; padding: 14px; }
.section-title { margin: 0 0 10px 0; font-size: 16px; color: var(--muted); font-weight: 600; }
.filter-group { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }

.info-cards { margin-top: 14px; display: grid; gap: 10px; }
.info-card { background: var(--card); border: 1px solid #20283a; border-radius: 12px; padding: 12px; display: grid; gap: 6px; }
.info-card .title { font-weight: 600; }
.info-card .date { color: var(--muted); font-size: 13px; }
.info-card .badge { display: inline-block; padding: 2px 8px; border-radius: 100px; font-size: 12px; color: #fff; }
.badge.national { background: #2e6df6; }
.badge.shanghai_school { background: #4cc38a; }
.badge.traditional { background: #ab4df6; }
.badge.observances { background: #f6a62e; }

.calendar { grid-area: calendar; background: var(--panel); border: 1px solid #20283a; border-radius: 16px; padding: 14px; }
.calendar-controls { display: flex; align-items: center; justify-content: space-between; }
.month-label { font-size: 18px; font-weight: 600; }
.weekdays { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; margin-top: 14px; color: var(--muted); }
.weekdays > div { text-align: center; padding: 8px; background: #121827; border-radius: 8px; border: 1px solid #1d2740; }
.days-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; margin-top: 8px; }
.day { position: relative; min-height: 88px; padding: 8px; background: #0f1422; border: 1px solid #1d2740; border-radius: 10px; display: grid; align-content: start; gap: 6px; }
.day .num { font-weight: 600; }
.day .labels { display: grid; gap: 4px; }
.label { display: inline-block; padding: 2px 6px; border-radius: 8px; font-size: 11px; color: #fff; }
.label.national { background: #2e6df6; }
.label.shanghai_school { background: #4cc38a; }
.label.traditional { background: #ab4df6; }
.label.observances { background: #f6a62e; }
.day.dim { opacity: 0.35; }
.day.today { outline: 2px solid var(--accent); }

.app-footer { margin-top: 24px; color: var(--muted); }
.app-footer a { color: var(--primary); text-decoration: none; }
.app-footer a:hover { text-decoration: underline; }

@media (max-width: 960px) {
  .content { grid-template-columns: 1fr; grid-template-areas: "calendar" "sidebar"; }
  .search-box input { width: 100%; }
}