:root {
  --bg-primary: #0f1117;
  --bg-secondary: #161822;
  --bg-card: #1a1d27;
  --bg-card-hover: #22263a;
  --text-primary: #e4e6eb;
  --text-secondary: #8b8fa3;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --border: #2a2d3a;
  --radius: 12px;
  --radius-sm: 8px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
}

/* Header */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

#last-updated {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.header-actions button {
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.15s;
}

.header-actions button:hover {
  background: var(--bg-card-hover);
}

.header-actions button:active {
  transform: scale(0.97);
}

.header-actions button.loading {
  opacity: 0.6;
  pointer-events: none;
}

/* Main */
main {
  padding: 20px;
  max-width: 1400px;
  margin: 0 auto;
}

/* Device Grid */
.device-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

/* Loading */
.loading {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.loading.hidden { display: none; }

/* Error Banner */
.error-banner {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--danger);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-bottom: 16px;
  color: var(--danger);
  font-size: 0.85rem;
}

.error-banner.hidden { display: none; }

/* Empty State */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-secondary);
}

.empty-state p {
  margin-top: 8px;
  font-size: 0.9rem;
}

/* Device Card */
.device-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  transition: background 0.15s, border-color 0.15s;
}

.device-card:hover {
  background: var(--bg-card-hover);
  border-color: #363a4d;
}

.device-card.offline {
  opacity: 0.55;
}

.device-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.device-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  object-fit: contain;
  background: var(--bg-secondary);
  padding: 4px;
  flex-shrink: 0;
}

.device-icon-emoji {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.device-info {
  flex: 1;
  min-width: 0;
}

.device-name {
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.device-category {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.online-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--danger);
  flex-shrink: 0;
}

.online-indicator.online {
  background: var(--success);
}

/* Device Status */
.device-status {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.status-tag {
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.status-tag .value {
  color: var(--text-primary);
  font-weight: 500;
}

/* Device Controls */
.device-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

/* Toggle Switch */
.toggle-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.toggle-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.toggle {
  position: relative;
  width: 44px;
  height: 24px;
  border-radius: 12px;
  background: var(--border);
  cursor: pointer;
  transition: background 0.2s;
  border: none;
  padding: 0;
}

.toggle.active {
  background: var(--accent);
}

.toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.2s;
}

.toggle.active::after {
  transform: translateX(20px);
}

.toggle:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Slider */
.slider-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
}

.slider-wrap label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.slider-wrap input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  height: 4px;
}

.slider-wrap .slider-value {
  font-size: 0.8rem;
  color: var(--text-primary);
  min-width: 32px;
  text-align: right;
}

/* Stats Bar */
.stats-bar {
  display: flex;
  gap: 24px;
  padding: 12px 0;
  margin-bottom: 8px;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.stats-bar .stat-value {
  color: var(--text-primary);
  font-weight: 600;
}

@media (max-width: 640px) {
  header { padding: 12px 16px; }
  main { padding: 12px; }
  .device-grid { grid-template-columns: 1fr; gap: 12px; }
  .stats-bar { gap: 16px; font-size: 0.8rem; }
}