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

:root {
  --primary: #1d4ed8;
  --primary-hover: #1e40af;
  --success: #059669;
  --success-bg: #ecfdf5;
  --warning: #d97706;
  --warning-bg: #fffbeb;
  --error: #dc2626;
  --error-bg: #fef2f2;
  --bg: #ffffff;
  --bg-card: #ffffff;
  --bg-hover: #f3f4f6;
  --text: #111827;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --input-bg: #ffffff;
  --radius: 0.5rem;
}

html.dark {
  --success-bg: #064e3b;
  --warning-bg: #78350f;
  --error-bg: #7f1d1d;
  --bg: #000000;
  --bg-card: #111827;
  --bg-hover: #1f2937;
  --text: #d1d5db;
  --text-muted: #6b7280;
  --border: #1f2937;
  --input-bg: #1f2937;
}

body { font-family: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; color: var(--text); background: var(--bg); line-height: 1.6; }

.container { max-width: 720px; margin: 0 auto; padding: 1rem; }
.hidden { display: none; }
.page { display: none; }
.page.active { display: block; }

.btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.625rem 1.5rem; border-radius: var(--radius); font-weight: 500; cursor: pointer; border: none; transition: all 0.15s ease; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-outline { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.btn-outline:hover { background: var(--bg-hover); }
.btn-lg { padding: 0.75rem 2rem; font-size: 1.125rem; }

.form-group { margin-bottom: 1.25rem; }
.form-label { display: block; font-weight: 500; margin-bottom: 0.5rem; font-size: 0.9375rem; }
.form-control { width: 100%; padding: 0.625rem 0.75rem; border: 1px solid var(--border); border-radius: var(--radius); font-size: 0.9375rem; background: var(--input-bg); color: var(--text); }
.form-control:focus { outline: 2px solid var(--primary); outline-offset: -1px; border-color: var(--primary); }

.slider-container { display: flex; align-items: center; gap: 1rem; }
.slider { flex: 1; accent-color: var(--primary); }
.slider-value { font-weight: 600; white-space: nowrap; min-width: 90px; text-align: right; }

.radio-group { display: flex; flex-direction: column; gap: 0.5rem; }
.radio-item { display: flex; align-items: flex-start; gap: 0.75rem; padding: 0.75rem; border: 1px solid var(--border); border-radius: var(--radius); cursor: pointer; transition: border-color 0.15s; }
.radio-item:hover { border-color: var(--primary); }
.radio-item input[type="radio"] { margin-top: 0.25rem; accent-color: var(--primary); }
.radio-title { font-weight: 500; }
.radio-description { font-size: 0.8125rem; color: var(--text-muted); }

.checkbox-group { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; }
.checkbox-item { display: flex; align-items: center; gap: 0.5rem; padding: 0.5rem 0.75rem; border: 1px solid var(--border); border-radius: var(--radius); cursor: pointer; font-size: 0.875rem; transition: border-color 0.15s; }
.checkbox-item:hover { border-color: var(--primary); }
.checkbox-item input[type="checkbox"] { accent-color: var(--primary); }

.process-category { margin-bottom: 1.25rem; }
.category-title { font-weight: 600; margin-bottom: 0.5rem; font-size: 0.9375rem; }

.progress-container { margin-bottom: 2rem; }
.progress-bar { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--primary); transition: width 0.3s ease; border-radius: 3px; }
.progress-text { font-size: 0.8125rem; color: var(--text-muted); margin-top: 0.5rem; text-align: center; }

.step { display: none; }
.step.active { display: block; }
.step-header { margin-bottom: 1.5rem; }
.step-header h2 { font-size: 1.5rem; font-weight: 700; }
.step-description { color: var(--text-muted); margin-top: 0.25rem; }

.step-navigation { display: flex; justify-content: space-between; margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }

.data-review .review-section { margin-bottom: 1.25rem; }
.data-review .review-section h4 { font-weight: 600; margin-bottom: 0.5rem; color: var(--primary); }
.data-review .review-item { display: flex; justify-content: space-between; padding: 0.375rem 0; border-bottom: 1px solid var(--bg-hover); font-size: 0.875rem; }
.data-review .review-label { color: var(--text-muted); }

.results-header { text-align: center; margin-bottom: 2rem; }
.results-header h1 { font-size: 2rem; font-weight: 700; }

.roi-summary-card { background: var(--bg-card); border-radius: var(--radius); padding: 2rem; text-align: center; margin-bottom: 2rem; box-shadow: 0 1px 3px rgba(0,0,0,0.1); }
.roi-percentage { font-size: 3rem; font-weight: 800; }
.roi-percentage.excellent { color: var(--success); }
.roi-percentage.good { color: var(--primary); }
.roi-percentage.moderate { color: var(--warning); }
.roi-percentage.poor { color: var(--error); }
.roi-label { color: var(--text-muted); font-size: 0.875rem; margin-top: 0.25rem; }
.roi-metrics { display: flex; justify-content: center; gap: 3rem; margin-top: 1.5rem; }
.roi-metric .metric-value { font-size: 1.25rem; font-weight: 600; }
.roi-metric .metric-label { font-size: 0.8125rem; color: var(--text-muted); }

.benefits-section, .chart-section, .metrics-section, .insights-section { margin-bottom: 2rem; }
.benefits-section h3, .chart-section h3, .metrics-section h3, .insights-section h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 1rem; }

.benefits-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.benefit-card { display: flex; align-items: center; gap: 0.75rem; padding: 1rem; background: var(--bg-card); border-radius: var(--radius); box-shadow: 0 1px 3px rgba(0,0,0,0.1); }
.benefit-icon { font-size: 1.5rem; }
.benefit-value { font-weight: 600; }
.benefit-label { font-size: 0.8125rem; color: var(--text-muted); }

.total-benefits { margin-top: 1rem; padding: 1rem; background: var(--bg-hover); border-radius: var(--radius); text-align: center; }

.metrics-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.metric-item { padding: 1rem; background: var(--bg-card); border-radius: var(--radius); box-shadow: 0 1px 3px rgba(0,0,0,0.1); text-align: center; }
.metric-item .metric-title { font-size: 0.8125rem; color: var(--text-muted); }
.metric-item .metric-value { font-size: 1.25rem; font-weight: 600; margin-top: 0.25rem; }

.insight-card { padding: 1rem; border-radius: var(--radius); margin-bottom: 1rem; }
.insight-card.success { background: var(--success-bg); border-left: 3px solid var(--success); }
.insight-card.warning { background: var(--warning-bg); border-left: 3px solid var(--warning); }
.insight-card.error { background: var(--error-bg); border-left: 3px solid var(--error); }
.insight-card h4 { font-weight: 600; margin-bottom: 0.5rem; }
.insight-recommendations { margin-top: 0.5rem; padding-left: 1.25rem; }
.insight-recommendations li { margin-bottom: 0.25rem; font-size: 0.875rem; }

.results-actions { display: flex; gap: 1rem; justify-content: center; margin-top: 2rem; }

.newsletter-gate { background: var(--bg-card); border-radius: var(--radius); padding: 2rem; text-align: center; margin-top: 2rem; box-shadow: 0 1px 3px rgba(0,0,0,0.1); }
.newsletter-gate h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 0.5rem; }
.newsletter-gate p { color: var(--text-muted); margin-bottom: 1rem; }
.newsletter-gate-form { display: flex; gap: 0.5rem; }
.newsletter-gate-form input[type="email"] { flex: 1; padding: 0.625rem 0.75rem; border: 1px solid var(--border); border-radius: var(--radius); font-size: 0.9375rem; background: var(--input-bg); color: var(--text); }
.newsletter-gate-form input[type="email"]:focus { outline: 2px solid var(--primary); outline-offset: -1px; border-color: var(--primary); }
.newsletter-gate-error { color: var(--error); font-size: 0.875rem; margin-top: 0.5rem; }
.newsletter-gate-microcopy { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.5rem; }
.newsletter-gate-success { text-align: center; padding: 1.5rem 0; }
.newsletter-gate-success h4 { font-size: 1.125rem; font-weight: 600; margin-bottom: 0.25rem; }
.newsletter-gate-success p { color: var(--text-muted); }

@media (max-width: 640px) {
  .checkbox-group { grid-template-columns: 1fr; }
  .roi-metrics { flex-direction: column; gap: 1rem; }
  .newsletter-gate-form { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; }
}