:root {
  --bg-base: #090a0f;
  --bg-gradient: radial-gradient(circle at 50% 0%, #171b2c 0%, #090a0f 75%);
  --surface-glass: rgba(22, 27, 40, 0.72);
  --surface-glass-hover: rgba(30, 36, 54, 0.85);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-bright: rgba(255, 255, 255, 0.15);
  
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.35);
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  
  --laser-red: #ef4444;
  --laser-glow: rgba(239, 68, 68, 0.45);
  --laser-gradient: linear-gradient(135deg, #ef4444 0%, #991b1b 100%);

  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-pill: 9999px;
  
  --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.6), 0 0 0 1px var(--border-glass);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
}

html {
  height: 100%;
  overscroll-behavior: none;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Inter', system-ui, sans-serif;
  background: var(--bg-base);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100dvh;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  padding: 12px 18px;
  background: rgba(13, 16, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.app-logo {
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.4px;
}
.app-logo span {
  color: var(--accent);
  background: linear-gradient(135deg, #60a5fa, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* Status badge */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  font-weight: 600;
  background: rgba(22, 27, 40, 0.8);
  border: 1px solid var(--border-glass);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  position: relative;
}

.status-dot::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  opacity: 0.75;
  animation: pulse-ring 2s cubic-bezier(0.24, 0, 0.38, 1) infinite;
}

.status-dot.connected { background: var(--success); }
.status-dot.connected::after { background: var(--success); }
.status-dot.connecting { background: var(--warning); }
.status-dot.connecting::after { background: var(--warning); }
.status-dot.disconnected { background: var(--danger); }
.status-dot.disconnected::after { background: var(--danger); }

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 0.8; }
  70% { transform: scale(2.4); opacity: 0; }
  100% { transform: scale(2.4); opacity: 0; }
}

/* Tab bar */
.app-nav {
  display: flex;
  background: rgba(10, 13, 20, 0.95);
  border-bottom: 1px solid var(--border-glass);
  padding: 0 8px;
  overflow-x: auto;
  position: sticky;
  top: 49px;
  z-index: 90;
}

.tab-btn {
  flex: 1;
  min-width: 80px;
  padding: 10px 8px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}
.tab-btn.active {
  color: #fff;
  border-bottom-color: var(--accent);
}

/* Layout */
main {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 520px;
  margin: 0 auto;
  width: 100%;
  flex: 1;
}

.tab-pane {
  display: none;
  flex-direction: column;
  gap: 14px;
}
.tab-pane.active {
  display: flex;
}

.card {
  background: var(--surface-glass);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.card-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

/* Presentation hero card */
.presentation-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.progress-bar-wrap {
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--accent-gradient);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.hero-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.slide-count-badge {
  font-size: 24px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.5px;
  color: #fff;
}
.slide-count-badge span {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}

.state-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-glass);
}
.state-badge.running {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border-color: rgba(16, 185, 129, 0.3);
}

.preview-container {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.preview-container img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.preview-placeholder {
  font-size: 12px;
  color: var(--text-muted);
}

.hero-footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 4px;
}

.file-label {
  font-size: 12px;
  color: var(--text-secondary);
  max-width: 60%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.timer-display {
  font-size: 20px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: #60a5fa;
  letter-spacing: -0.3px;
}

/* Navigation buttons */
.nav-row {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 12px;
}

.btn-nav-primary {
  height: 84px;
  border-radius: var(--radius-lg);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: none;
  cursor: pointer;
  transition: transform 0.08s ease;
  touch-action: manipulation;
}
.btn-nav-primary:active { transform: scale(0.95); }
.btn-nav-primary:disabled { opacity: 0.3; cursor: not-allowed; }

.btn-prev {
  background: rgba(30, 36, 54, 0.85);
  color: var(--text-primary);
  border: 1px solid var(--border-glass-bright);
}
.btn-next {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

/* Floating toolbar dock */
.control-dock {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  padding: 6px;
  background: rgba(18, 22, 34, 0.8);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
}

.dock-btn {
  height: 52px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
}
.dock-btn .dock-icon { font-size: 17px; }
.dock-btn:hover:not(:disabled) { background: rgba(255, 255, 255, 0.06); color: var(--text-primary); }
.dock-btn:disabled { opacity: 0.3; cursor: not-allowed; }

.dock-btn.active-blackout {
  background: rgba(239, 68, 68, 0.18);
  border-color: rgba(239, 68, 68, 0.4);
  color: #fca5a5;
}

.btn-icon-header {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(22, 27, 40, 0.8);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.btn-icon-header.active {
  color: #fbbf24;
  border-color: rgba(251, 191, 36, 0.4);
  background: rgba(251, 191, 36, 0.1);
}

/* Speaker notes */
.notes-header-actions { display: flex; gap: 6px; }
.btn-font-size {
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 700;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  cursor: pointer;
}
.notes-content {
  font-size: 14px;
  line-height: 1.65;
  color: #e2e8f0;
  white-space: pre-wrap;
  max-height: 140px;
  overflow-y: auto;
  background: rgba(10, 13, 20, 0.6);
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-glass);
  user-select: text;
  -webkit-user-select: text;
}
.notes-empty { color: var(--text-muted); font-style: italic; }

/* Diagnostics grid */
.diag-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.diag-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.diag-lbl {
  font-size: 13px;
  color: var(--text-secondary);
}
.diag-val {
  font-size: 13px;
  font-weight: 700;
  font-family: monospace;
  color: var(--text-primary);
}
.diag-val.good { color: var(--success); }
.diag-val.warn { color: var(--warning); }
.diag-val.error { color: var(--danger); }
.diag-val.highlight { color: #60a5fa; font-size: 15px; }

.btn-full {
  width: 100%;
  height: 44px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 700;
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  cursor: pointer;
}
.btn-full:disabled { opacity: 0.4; cursor: not-allowed; }

/* Pointer HUD canvas */
.laser-hud-wrap {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #06070a;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass-bright);
  overflow: hidden;
  position: relative;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.8);
}
#pointerCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.laser-controls-row {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

.btn-laser-toggle {
  flex: 1.2;
  height: 44px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 700;
  background: rgba(30, 36, 54, 0.85);
  border: 1px solid var(--border-glass-bright);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  cursor: pointer;
}
.btn-laser-toggle.active {
  background: var(--laser-gradient);
  border-color: var(--laser-red);
  color: #fff;
  box-shadow: 0 0 16px var(--laser-glow);
}

.btn-secondary {
  flex: 0.8;
  height: 44px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  cursor: pointer;
}

.select-mode {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-glass);
  color: #fff;
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 11px;
}

.slider-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
}
.slider-row input[type="range"] {
  flex: 1;
}

.ping-history-box {
  background: rgba(6, 8, 14, 0.8);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 10px;
  font-family: monospace;
  font-size: 11px;
  color: #94a3b8;
  max-height: 120px;
  overflow-y: auto;
  white-space: pre-wrap;
}