/* ==========================================================================
   Fuzzy SG v3 — Modern Theme & Layout
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --border-color: #e2e8f0;
  --accent-color: #2563eb;
  --hover-bg: #f1f5f9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --accent-color: #3b82f6;
    --hover-bg: #273548;
  }
}

/* ── Reset & Base ───────────────────────────────────────────────────── */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  padding-bottom: 2rem;
}

.container {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ── Header ─────────────────────────────────────────────────────────── */

.site-header {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 0;
  margin-bottom: 1.5rem;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
}

.tagline {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.nav-btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  background-color: var(--accent-color);
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: opacity 0.2s ease;
}

.nav-btn:hover {
  opacity: 0.85;
}

/* ── Status Bar ─────────────────────────────────────────────────────── */

.status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--card-bg);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
}

.pulse-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: #94a3b8;
  flex-shrink: 0;
}

.pulse-dot.dot-ok {
  background-color: #10b981;
  animation: pulse-ok 2s infinite;
}

.pulse-dot.dot-stale {
  background-color: #f59e0b;
  animation: pulse-stale 1.5s infinite;
}

@keyframes pulse-ok {
  0%   { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.5); }
  70%  { transform: scale(1);    box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

@keyframes pulse-stale {
  0%   { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.5); }
  70%  { transform: scale(1);    box-shadow: 0 0 0 6px rgba(245, 158, 11, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(245, 158, 11, 0); }
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.35rem 0.85rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.875rem;
  transition: background-color 0.15s ease;
}

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

/* ── Region Cards Grid ──────────────────────────────────────────────── */

.region-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(175px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.loading-placeholder {
  grid-column: 1 / -1;
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.region-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: box-shadow 0.2s ease;
}

.region-card:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.region-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 0.5rem;
  margin-bottom: 0.25rem;
}

.region-name {
  font-size: 1.05rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.region-time {
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.stat-val {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
}

.stat-val strong {
  font-weight: 600;
}

/* ── AQI Quality Badges ─────────────────────────────────────────────── */

.quality-badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 700;
  min-width: 2.5rem;
  text-align: center;
}

.aqi-good {
  color: #fff;
  background-color: #22c55e;
}

.aqi-moderate {
  color: #1a1a1a;
  background-color: #ffde33;
}

.aqi-sensitive {
  color: #1a1a1a;
  background-color: #ff9900;
}

.aqi-unhealthy {
  color: #fff;
  background-color: #ef4444;
}

.aqi-vunhealthy {
  color: #fff;
  background-color: #a26fff;
}

.aqi-hazardous {
  color: #fff;
  background-color: #7f1d1d;
}

/* ── Content Panels & Charts ────────────────────────────────────────── */

.content-panel {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.content-panel h2 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.chart-note {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.chart-container {
  position: relative;
  height: 380px;
  width: 100%;
}

/* ── Data Table ─────────────────────────────────────────────────────── */

.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.82rem;
}

.data-table th,
.data-table td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table th {
  background-color: var(--bg-color);
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  position: sticky;
  top: 0;
}

#stats-body tr {
  background-color: var(--hover-bg);
  font-weight: 600;
}

.data-table tbody tr:hover {
  background-color: var(--hover-bg);
}

.center-text {
  text-align: center;
}

/* ── Info & Footer ──────────────────────────────────────────────────── */

.info-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  border-radius: 8px;
  margin-bottom: 2rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.info-card h3 {
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.site-footer {
  text-align: left;
  font-size: 0.78rem;
  color: var(--text-secondary);
  padding: 1rem 0;
}

.site-footer p {
  margin-bottom: 0.3rem;
}

.site-footer a {
  color: var(--accent-color);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

.site-footer code {
  font-size: 0.78rem;
  background-color: var(--hover-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
}

.disclaimer {
  font-style: italic;
  opacity: 0.8;
}

/* ── Responsive Tweaks ──────────────────────────────────────────────── */

@media (max-width: 600px) {
  .site-header .container {
    flex-direction: column;
    align-items: flex-start;
  }

  .chart-container {
    height: 280px;
  }

  .region-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 380px) {
  .region-grid {
    grid-template-columns: 1fr;
  }
}