* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --secondary: #64748b;
  --dark: #0f172a;
  --darker: #1e293b;
  --card: rgba(255,255,255,0.05);
  --border: rgba(255,255,255,0.1);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --success: #4ade80;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, var(--dark) 0%, var(--darker) 100%);
  color: var(--text);
  min-height: 100vh;
  padding: 2rem;
}
.container { max-width: 1200px; margin: 0 auto; }
header { text-align: center; margin-bottom: 2rem; }
header h1 { font-size: 2.5rem; font-weight: 700; color: #fff; }
header .subtitle { color: var(--primary); }

.help-section {
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid var(--primary);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}
.help-section h3 { color: var(--primary); margin-bottom: 1rem; }
.help-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1rem; }
.help-item { padding: 0.75rem; background: var(--dark); border-radius: 6px; font-size: 0.875rem; }

.controls-section, .input-section, .results-section, .scenario-section, .recommendation-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}
.controls-section h3, .input-section h3, .results-section h3, .scenario-section h3, .recommendation-section h3 {
  color: #fff;
  margin-bottom: 1rem;
}
.control-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; }
.control-group { display: flex; flex-direction: column; gap: 0.5rem; }
.control-group label { font-size: 0.875rem; color: var(--secondary); }
.control-group input, .control-group select { padding: 0.75rem; border-radius: 6px; border: 1px solid var(--border); background: var(--dark); color: var(--text); }
.control-group input[type="range"] { width: 100%; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; }
.field { display: flex; flex-direction: column; gap: 0.5rem; }
.field label { font-size: 0.875rem; color: var(--secondary); }
.field input { padding: 0.75rem; border-radius: 6px; border: 1px solid var(--border); background: var(--dark); color: var(--text); }

.ctc-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; }
.ctc-card { background: var(--dark); border-radius: 8px; padding: 1rem; text-align: center; }
.ctc-card .ccc-label { font-size: 0.75rem; color: var(--secondary); margin-bottom: 0.5rem; }
.ctc-card .ccc-value { font-size: 1.5rem; font-weight: 700; color: var(--primary); }
.ctc-card .ccc-target { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.25rem; }
.ctc-card.result .ccc-value { color: var(--success); }

.scenario-controls { display: flex; flex-direction: column; gap: 1.5rem; }
.scenario-controls .control-group label { display: flex; justify-content: space-between; }
.scenario-controls .control-group span { color: var(--primary); font-weight: 600; }

.scenario-results { display: flex; gap: 2rem; margin-top: 1rem; flex-wrap: wrap; }
.result-item { display: flex; justify-content: space-between; gap: 1rem; }
.result-item .result-value { color: var(--primary); font-weight: 600; }
.result-item .success { color: var(--success); }

.ai-insight { background: rgba(59, 130, 246, 0.1); border: 1px solid var(--primary); border-radius: 8px; padding: 1rem; margin-bottom: 1rem; }
.ai-insight strong { color: var(--primary); }

.recommendations-list { display: flex; flex-direction: column; gap: 0.75rem; }
.rec-item { display: flex; align-items: flex-start; gap: 0.75rem; }
.rec-icon { font-size: 1.25rem; }
.rec-text { color: var(--text-muted); }

.actions-section { display: flex; gap: 1rem; justify-content: center; margin-top: 2rem; }
.btn { padding: 0.75rem 1.5rem; border-radius: 6px; border: none; background: var(--primary); color: #fff; cursor: pointer; font-size: 0.875rem; }
.btn:hover { background: var(--primary-dark); }

.attribution { text-align: center; padding: 2rem; color: var(--secondary); font-size: 0.875rem; }