:root {
  --bg-primary: #f1f5f9;
  --bg-panel: rgba(255, 255, 255, 0.82);
  --bg-panel-solid: #ffffff;
  --border-color: rgba(15, 23, 42, 0.08);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --color-teal: #0f766e;
  --color-teal-glow: rgba(15, 118, 110, 0.15);
  --color-amber: #d97706;
  --color-amber-glow: rgba(217, 119, 6, 0.15);
  --color-bronze: #a16207;
  --color-red: #be123c;
  --color-green: #15803d;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  font-family: var(--font-stack);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

#canvas-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* --- HUD Overlay --- */
.hud-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  pointer-events: none;
  display: grid;
  grid-template-columns: 320px 1fr 340px;
  grid-template-rows: 80px 1fr 100px;
  padding: 20px;
  gap: 20px;
}

.hud-interactive {
  pointer-events: auto;
}

/* --- Header Panel --- */
header.panel {
  grid-column: 1 / -1;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.brand-section {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--text-primary);
}

.brand-subtitle {
  font-size: 11px;
  font-weight: 700;
  color: var(--color-red);
  letter-spacing: 1.5px;
  margin-top: 2px;
}

.pool-badge {
  font-size: 14px;
  font-weight: 600;
  background: var(--color-teal-glow);
  color: var(--color-teal);
  padding: 4px 12px;
  border-radius: 6px;
  border: 1px solid rgba(15, 118, 110, 0.2);
}

.block-status {
  display: flex;
  align-items: center;
  gap: 16px;
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.live-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 12px;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--color-green);
  color: #fff;
  transition: all 0.3s ease;
}

.live-indicator.replay {
  background: var(--color-amber);
}

.live-dot {
  width: 6px;
  height: 6px;
  background-color: #fff;
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { opacity: 0.3; }
  50% { opacity: 1; }
  100% { opacity: 0.3; }
}

/* --- Sidebar Panels --- */
aside.left-panel {
  grid-column: 1;
  grid-row: 2;
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow-y: auto;
  padding-right: 4px;
}

aside.right-panel {
  grid-column: 3;
  grid-row: 2;
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow-y: auto;
  padding-right: 4px;
}

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 14px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 4px;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}

.stat-label {
  color: var(--text-secondary);
}

.stat-value {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.stat-value.delta-pos {
  color: var(--color-green);
}

.stat-value.delta-neg {
  color: var(--color-red);
}

.stale-warning {
  display: none;
  font-size: 11px;
  font-weight: 700;
  color: var(--color-red);
  background: rgba(190, 18, 60, 0.1);
  padding: 4px 8px;
  border-radius: 4px;
  text-align: center;
  margin-top: 4px;
  border: 1px solid rgba(190, 18, 60, 0.2);
}

/* --- Control Footer --- */
footer.control-panel {
  grid-column: 1 / -1;
  grid-row: 3;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.05);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  padding: 0 24px;
  gap: 20px;
}

.play-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  background: var(--bg-panel-solid);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03);
  transition: all 0.2s ease;
}

.btn:hover {
  background: #f8fafc;
  border-color: #94a3b8;
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.timeline-container {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
}

.slider-wrapper {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: #cbd5e1;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-teal);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  transition: transform 0.1s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.time-readout {
  font-size: 13px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  min-width: 140px;
}

/* --- Developer / Failure Mode Panel --- */
.dev-toggle-container {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
}

.dev-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.dev-checkbox {
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

/* Mobile responsive styles */
@media (max-width: 768px) {
  .hud-container {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr auto;
    padding: 10px;
    gap: 10px;
  }
  aside.left-panel, aside.right-panel {
    display: none; /* Hide sidebars on small mobile for clean view */
  }
  header.panel {
    padding: 0 12px;
    height: 60px;
  }
  .brand-title {
    font-size: 16px;
  }
  footer.control-panel {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
    padding: 12px;
    height: auto;
    gap: 10px;
  }
  .timeline-container {
    width: 100%;
  }
}