/* ============================================
   AIRFLOW DASHBOARD — Control Room Aesthetic
   ============================================ */

:root {
  --bg-deep: #050a14;
  --bg-primary: #0a1120;
  --bg-card: #0f1a2e;
  --bg-card-hover: #132240;
  --bg-surface: #162544;
  --border: #1e3a5f;
  --border-subtle: #152a4a;

  --text-primary: #e8edf5;
  --text-secondary: #8899b4;
  --text-muted: #5a6e8a;
  --text-accent: #64b5f6;

  --accent-blue: #2196f3;
  --accent-cyan: #00bcd4;
  --accent-amber: #ffc107;
  --accent-green: #4caf50;
  --accent-red: #ef5350;
  --accent-orange: #ff9800;
  --accent-purple: #ab47bc;

  --crypto-btc: #f7931a;
  --crypto-eth: #627eea;
  --crypto-sol: #9945ff;

  --congestion-relaxed: #4caf50;
  --congestion-normal: #2196f3;
  --congestion-slight: #ff9800;
  --congestion-crowded: #ef5350;

  --font-display: 'IBM Plex Sans KR', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius: 12px;
  --radius-sm: 6px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
}

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

html {
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-display);
  background: var(--bg-deep);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Grain texture overlay */
.grain-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---- HEADER ---- */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  border-bottom: 1px solid var(--border-subtle);
  background: linear-gradient(180deg, rgba(15,26,46,0.95), rgba(10,17,32,0.98));
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header__left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.header__logo {
  display: flex;
  gap: 5px;
}

.header__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-red);
  box-shadow: 0 0 8px var(--accent-red);
}

.header__dot--amber {
  background: var(--accent-amber);
  box-shadow: 0 0 8px var(--accent-amber);
}

.header__dot--green {
  background: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
  animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px var(--accent-green); }
  50% { opacity: 0.6; box-shadow: 0 0 4px var(--accent-green); }
}

.header__title {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--text-primary);
}

.header__title--thin {
  font-weight: 300;
  color: var(--text-secondary);
}

.header__right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.header__updated {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.header__updated-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 2px;
  color: var(--text-muted);
  text-transform: uppercase;
}

.header__updated-time {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent-cyan);
}

.header__controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header__date-picker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}

.header__date-picker:focus {
  border-color: var(--accent-blue);
}

.header__date-picker::-webkit-calendar-picker-indicator {
  filter: invert(0.7);
  cursor: pointer;
}

.header__refresh-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 1px;
  transition: all 0.2s;
}

.header__refresh-btn:hover {
  border-color: var(--accent-blue);
  color: var(--text-primary);
}

.header__refresh-btn.active {
  border-color: var(--accent-green);
  color: var(--accent-green);
  background: rgba(76,175,80,0.08);
}

.header__refresh-btn.active .header__refresh-icon {
  animation: spin 3s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.header__refresh-icon {
  width: 14px;
  height: 14px;
}

/* ---- DASHBOARD GRID ---- */
.dashboard {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 20px 20px;
}

/* ---- PANELS ---- */
.panel {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  transition: border-color 0.3s;
}

.panel:hover {
  border-color: var(--border);
}

.panel--trend {
  grid-column: 1 / -1;
}

.panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(255,255,255,0.01);
}

.panel__title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: 0.5px;
}

.panel__icon {
  font-size: 1rem;
}

.panel__badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 20px;
  background: rgba(33,150,243,0.12);
  color: var(--accent-blue);
  letter-spacing: 0.5px;
}

.panel__select {
  font-family: var(--font-display);
  font-size: 0.8rem;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  cursor: pointer;
  outline: none;
}

.panel__select option {
  background: var(--bg-card);
}

.panel__body {
  padding: 16px 18px;
}

/* Loading skeletons */
.panel__loading {
  display: none;
  padding: 16px 18px;
}

.panel__loading.active {
  display: block;
}

.panel__body:has(~ .panel__loading.active) {
  display: none;
}

.skeleton--cards {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
}

.skeleton__card {
  flex: 1;
  height: 72px;
  background: linear-gradient(90deg, var(--bg-surface) 25%, rgba(30,58,95,0.5) 50%, var(--bg-surface) 75%);
  background-size: 200% 100%;
  border-radius: var(--radius-sm);
  animation: shimmer 1.5s infinite;
}

.skeleton--chart {
  height: 200px;
  background: linear-gradient(90deg, var(--bg-surface) 25%, rgba(30,58,95,0.5) 50%, var(--bg-surface) 75%);
  background-size: 200% 100%;
  border-radius: var(--radius-sm);
  animation: shimmer 1.5s infinite;
}

.skeleton--badge {
  width: 100%;
  height: 80px;
  background: linear-gradient(90deg, var(--bg-surface) 25%, rgba(30,58,95,0.5) 50%, var(--bg-surface) 75%);
  background-size: 200% 100%;
  border-radius: var(--radius-sm);
  animation: shimmer 1.5s infinite;
  margin-bottom: 14px;
}

.skeleton--table {
  height: 280px;
  background: linear-gradient(90deg, var(--bg-surface) 25%, rgba(30,58,95,0.5) 50%, var(--bg-surface) 75%);
  background-size: 200% 100%;
  border-radius: var(--radius-sm);
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---- CHART CONTAINERS ---- */
.chart-container {
  position: relative;
  height: 220px;
}

.chart-container--trend {
  height: 200px;
}

/* ---- CRYPTO PANEL ---- */
.crypto-cards {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
}

.crypto-card {
  flex: 1;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  transition: border-color 0.2s, transform 0.2s;
}

.crypto-card:hover {
  border-color: var(--border);
  transform: translateY(-1px);
}

.crypto-card__name {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.crypto-card__price {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.crypto-card__change {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
}

.crypto-card__change.positive { color: var(--accent-green); }
.crypto-card__change.negative { color: var(--accent-red); }

.crypto-card__range {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ---- POPULATION PANEL ---- */
.population-top {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 14px;
}

.congestion-badge {
  flex: 1;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border-left: 3px solid var(--text-muted);
  transition: border-color 0.3s;
}

.congestion-badge[data-level="여유"] { border-left-color: var(--congestion-relaxed); }
.congestion-badge[data-level="보통"] { border-left-color: var(--congestion-normal); }
.congestion-badge[data-level="약간 붐빔"] { border-left-color: var(--congestion-slight); }
.congestion-badge[data-level="붐빔"] { border-left-color: var(--congestion-crowded); }

.congestion-badge__level {
  display: block;
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.congestion-badge[data-level="여유"] .congestion-badge__level { color: var(--congestion-relaxed); }
.congestion-badge[data-level="보통"] .congestion-badge__level { color: var(--congestion-normal); }
.congestion-badge[data-level="약간 붐빔"] .congestion-badge__level { color: var(--congestion-slight); }
.congestion-badge[data-level="붐빔"] .congestion-badge__level { color: var(--congestion-crowded); }

.congestion-badge__count {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.donut-container {
  width: 110px;
  height: 110px;
  flex-shrink: 0;
}

/* ---- WEATHER PANEL ---- */
.weather-cards {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
}

.weather-card {
  flex: 1;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
}

.weather-card__location {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.weather-card__temp {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--text-primary);
}

.weather-card__temp span {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-muted);
}

.weather-card__details {
  display: flex;
  gap: 10px;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.weather-card__details span::before {
  margin-right: 3px;
}

/* ---- SUBWAY PANEL ---- */
.subway-table-wrap {
  max-height: 340px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.subway-table-wrap::-webkit-scrollbar {
  width: 4px;
}

.subway-table-wrap::-webkit-scrollbar-track {
  background: transparent;
}

.subway-table-wrap::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.subway-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.subway-table thead {
  position: sticky;
  top: 0;
  z-index: 1;
}

.subway-table th {
  background: var(--bg-surface);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.73rem;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}

.subway-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  vertical-align: middle;
}

.subway-table tr:hover td {
  background: rgba(255,255,255,0.02);
  color: var(--text-primary);
}

.subway-line-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.78rem;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
}

.subway-arrival {
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.subway-arrival--soon {
  color: var(--accent-amber);
  font-weight: 600;
}

.subway-empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ---- TREND PANEL ---- */
.trend-tabs {
  display: flex;
  gap: 4px;
}

.trend-tab {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 5px 12px;
  border: 1px solid transparent;
  border-radius: 20px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

.trend-tab:hover {
  color: var(--text-secondary);
  background: rgba(255,255,255,0.03);
}

.trend-tab--active {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  background: rgba(0,188,212,0.06);
}

/* ---- FOOTER ---- */
.footer {
  text-align: center;
  padding: 16px 28px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 2px;
  border-top: 1px solid var(--border-subtle);
}

.footer__sep {
  margin: 0 8px;
  opacity: 0.4;
}

/* ---- RESPONSIVE ---- */
@media (max-width: 900px) {
  .dashboard {
    grid-template-columns: 1fr;
    padding: 12px 14px;
  }

  .panel--trend {
    grid-column: 1;
  }

  .header {
    flex-direction: column;
    gap: 12px;
    padding: 14px 16px;
  }

  .header__right {
    width: 100%;
    justify-content: space-between;
  }

  .crypto-cards, .weather-cards {
    flex-direction: column;
  }

  .population-top {
    flex-direction: column;
  }

  .donut-container {
    width: 140px;
    height: 140px;
  }
}

/* ---- ANIMATIONS ---- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel {
  animation: fadeIn 0.4s ease-out both;
}

.panel:nth-child(1) { animation-delay: 0.05s; }
.panel:nth-child(2) { animation-delay: 0.1s; }
.panel:nth-child(3) { animation-delay: 0.15s; }
.panel:nth-child(4) { animation-delay: 0.2s; }
.panel:nth-child(5) { animation-delay: 0.25s; }

/* No data state */
.no-data {
  display: none;
  align-items: center;
  justify-content: center;
  height: 200px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.no-data.active {
  display: flex;
}