:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-hover: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #3b82f6;
  --accent-red: #ef4444;
  --accent-green: #10b981;
  --accent-yellow: #f59e0b;
  --accent-purple: #8b5cf6;
  --border-color: #334155;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}
.ic-container { max-width: 1400px; margin: 0 auto; padding: 20px; }
header { text-align: center; margin-bottom: 24px; }
header h1 {
  font-size: 1.8rem; font-weight: 700;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 6px;
}
header .subtitle { color: var(--text-secondary); font-size: 0.95rem; }
.main-layout { display: grid; grid-template-columns: 1fr 320px; gap: 20px; }
@media (max-width: 1024px) { .main-layout { grid-template-columns: 1fr; } }

.canvas-area { display: flex; flex-direction: column; gap: 16px; }
.canvas-section {
  background: var(--bg-card); border-radius: 12px; border: 1px solid var(--border-color); overflow: hidden;
}
.canvas-header {
  padding: 10px 16px; font-size: 0.8rem; font-weight: 600; color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color); text-transform: uppercase; letter-spacing: 0.05em;
}
.canvas-wrapper {
  position: relative; width: 100%; aspect-ratio: 5 / 3; min-height: 300px;
}
.stats-canvas-wrapper {
  aspect-ratio: 5 / 2; min-height: 200px;
}
.canvas-wrapper canvas { width: 100%; height: 100%; display: block; }

.scenario-section {
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px;
}
.scenario-card {
  background: var(--bg-card); border-radius: 12px; border: 1px solid var(--border-color);
  padding: 16px; text-align: center;
}
.scenario-icon { font-size: 1.6rem; margin-bottom: 8px; }
.scenario-title { font-size: 0.85rem; font-weight: 600; color: var(--text-primary); margin-bottom: 4px; }
.scenario-desc { font-size: 0.72rem; color: var(--text-muted); line-height: 1.4; }

.controls-panel { display: flex; flex-direction: column; gap: 16px; }
.control-card {
  background: var(--bg-card); border-radius: 12px; border: 1px solid var(--border-color); padding: 16px;
}
.control-card h3 {
  font-size: 0.85rem; font-weight: 600; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 12px;
}
.preset-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.preset-btn {
  background: var(--bg-primary); border: 1px solid var(--border-color); border-radius: 8px;
  padding: 10px 8px; color: var(--text-primary); font-size: 0.8rem; cursor: pointer;
  transition: all 0.2s; text-align: center;
}
.preset-btn:hover { background: var(--bg-hover); border-color: var(--accent-blue); }
.preset-btn.active { background: rgba(59,130,246,0.15); border-color: var(--accent-blue); color: var(--accent-blue); }
.preset-btn .preset-name { display: block; font-weight: 600; margin-bottom: 2px; }
.preset-btn .preset-desc { font-size: 0.7rem; color: var(--text-muted); }

.slider-group { margin-bottom: 14px; }
.slider-group:last-child { margin-bottom: 0; }
.slider-label {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 6px;
}
.slider-value { font-weight: 600; color: var(--text-primary); min-width: 36px; text-align: right; }
input[type="range"] {
  width: 100%; height: 6px; -webkit-appearance: none; appearance: none;
  background: var(--bg-primary); border-radius: 3px; outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent-blue); cursor: pointer; transition: transform 0.15s;
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%; background: var(--accent-blue); cursor: pointer; border: none;
}

.action-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.action-btn {
  padding: 10px; border: 1px solid var(--border-color); border-radius: 8px;
  background: var(--bg-primary); color: var(--text-secondary); font-size: 0.85rem;
  cursor: pointer; transition: all 0.2s; text-align: center;
}
.action-btn:hover { background: var(--bg-hover); color: var(--text-primary); }
.action-btn.primary { background: var(--accent-blue); color: #fff; border-color: var(--accent-blue); }
.action-btn.primary:hover { background: #2563eb; }
.action-btn.reset { border-color: var(--accent-red); color: var(--accent-red); }
.action-btn.reset:hover { background: rgba(239,68,68,0.15); }
.action-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.stat-item {
  background: var(--bg-primary); border-radius: 8px; padding: 10px; text-align: center;
}
.stat-label { font-size: 0.7rem; color: var(--text-muted); margin-bottom: 4px; }
.stat-value { font-size: 1.05rem; font-weight: 700; color: var(--accent-blue); }
.stat-value.choice-a { color: var(--accent-blue); }
.stat-value.choice-b { color: var(--accent-red); }
.stat-value.correct { color: var(--accent-green); }
.stat-value.incorrect { color: var(--accent-red); }

.batch-stats { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border-color); }
.batch-stats h4 { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 8px; }

.explanation {
  background: var(--bg-card); border-radius: 12px; border: 1px solid var(--border-color);
  padding: 24px; margin-top: 20px;
}
.explanation h2 { font-size: 1.1rem; margin-bottom: 16px; color: var(--text-primary); }
.explanation p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 12px; line-height: 1.7; }
.explanation p:last-child { margin-bottom: 0; }

@media (max-width: 768px) {
  .ic-container { padding: 12px; }
  header h1 { font-size: 1.4rem; }
  .canvas-wrapper { aspect-ratio: 4 / 3; min-height: 250px; }
  .stats-canvas-wrapper { aspect-ratio: 4 / 3; min-height: 180px; }
  .scenario-section { grid-template-columns: 1fr; }
  .action-buttons { grid-template-columns: 1fr 1fr; }
}