:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #1a1d21;
  --text-muted: #5b6270;
  --border: #e2e5ea;
  --accent: #1d6fd6;
  --accent-contrast: #ffffff;
  --available: #1f9d55;
  --available-bg: #e8f8ee;
  --full: #d64545;
  --full-bg: #fdeaea;
  --unknown: #8a8f98;
  --unknown-bg: #eceef1;
  --error: #c0392b;
  --error-bg: #fbe9e7;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14161a;
    --surface: #1d2025;
    --text: #f1f2f4;
    --text-muted: #a3a9b3;
    --border: #2b2f36;
    --accent: #5b9bf0;
    --accent-contrast: #0d1117;
    --available: #43c274;
    --available-bg: #12291d;
    --full: #e57373;
    --full-bg: #2c1616;
    --unknown: #9aa0aa;
    --unknown-bg: #24272c;
    --error: #e57373;
    --error-bg: #2c1616;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.5;
}

.app-header {
  padding: 24px 16px 12px;
  text-align: center;
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: 1.4rem;
}

.subtitle {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px 40px;
}

.controls {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 20px;
}

.date-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.date-nav input[type="date"] {
  flex: 1;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 1.2rem;
  cursor: pointer;
}

.icon-btn:hover { background: var(--bg); }

.area-filter, .time-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.chip {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
}

.chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}

.primary-btn {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-contrast);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

.primary-btn:hover { filter: brightness(1.05); }
.primary-btn:disabled { opacity: 0.6; cursor: default; }

.status-bar {
  padding: 10px 14px;
  border-radius: 8px;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

.status-bar.loading { background: var(--unknown-bg); color: var(--text-muted); }
.status-bar.error { background: var(--error-bg); color: var(--error); }
.status-bar.info { background: var(--available-bg); color: var(--available); }

.facility-section { margin-bottom: 28px; }

.facility-section h2 {
  font-size: 1.05rem;
  margin: 0 0 10px;
}

.facility-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.facility-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
}

.facility-card-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 8px;
}

.facility-name {
  font-weight: 600;
  font-size: 1rem;
}

.facility-area {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.fav-btn {
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--unknown);
  line-height: 1;
  padding: 4px;
}

.fav-btn.active { color: #f5b301; }

.slot-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.slot {
  flex: 1 0 60px;
  text-align: center;
  padding: 6px 4px;
  border-radius: 6px;
  font-size: 0.75rem;
}

.slot.available { background: var(--available-bg); color: var(--available); }
.slot.full { background: var(--full-bg); color: var(--full); }
.slot.unknown { background: var(--unknown-bg); color: var(--unknown); }

.slot .count { display: block; font-weight: 700; font-size: 0.85rem; }

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 24px 12px;
  font-size: 0.9rem;
}

.app-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 20px 16px 32px;
}