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

:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --bg-card: #ffffff;
  --bg-card-alt: #f8fafc;
  --bg-input: #f1f5f9;
  --bg-canvas: #ffffff;

  --border-default: #e2e8f0;
  --border-hover: #cbd5e1;
  --border-accent: #3b82f6;

  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;

  --accent-blue: #3b82f6;
  --accent-blue-bg: rgba(59, 130, 246, 0.08);
  --accent-green: #16a34a;
  --accent-red: #ef4444;
  --accent-orange: #d97706;
  --accent-purple: #7c3aed;
  --accent-cyan: #0891b2;

  --slider-accent: #3b82f6;

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'JetBrains Mono', 'Courier New', monospace;

  --sidebar-width: 25%;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  line-height: 1.5;
}

.main-stage {
  flex: 3;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--bg-primary);
  border-right: 1px solid var(--border-default);
}

.sidebar-right {
  flex: 1;
  min-width: 260px;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px;
  overflow-y: auto;
  background: var(--bg-secondary);
}

h2 {
  font-weight: 500;
  font-size: 18px;
  color: var(--text-primary);
  margin-bottom: 8px;
  text-align: center;
}

h3 {
  font-weight: 500;
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

canvas {
  display: block;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
}

label {
  font-size: 13px;
  color: var(--text-secondary);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
  accent-color: var(--slider-accent);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-blue);
  border: 2px solid #fff;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
  transition: transform 0.12s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-blue);
  border: 2px solid #fff;
  cursor: pointer;
}

button {
  font-family: var(--font-sans);
  font-size: 13px;
  padding: 8px 16px;
  cursor: pointer;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-secondary);
  transition: all 0.15s;
  line-height: 1.4;
}

button:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

button:active {
  transform: scale(0.97);
}

button.on, button.active {
  background: var(--accent-blue-bg);
  color: var(--accent-blue);
  border-color: var(--accent-blue);
  font-weight: 500;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 5px 0;
  font-size: 13px;
}

.stat-item + .stat-item {
  border-top: 1px solid var(--border-default);
}

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

.stat-value {
  color: var(--accent-blue);
  font-family: var(--font-mono);
  font-size: 12px;
}

.note-text {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.65;
  padding-top: 8px;
  border-top: 1px solid var(--border-default);
  margin-top: 4px;
}

.btn-row {
  display: flex;
  gap: 8px;
}

.row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}
.row label {
  font-size: 12px;
  color: var(--text-secondary);
  min-width: 64px;
}
.row input[type=range] {
  flex: 1;
}
.row span {
  font-size: 12px;
  font-weight: 400;
  min-width: 36px;
  text-align: right;
  color: var(--text-primary);
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slider-row input {
  flex: 1;
}

.sval {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-blue);
  min-width: 38px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

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