* {
  box-sizing: border-box;
}

html {
  -webkit-overflow-scrolling: touch;
  overflow-x: hidden;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  margin: 0;
  padding: 0;
  background: #f8fafc;
  color: #1e293b;
  line-height: 1.5;
  overflow-x: hidden;
  min-height: 100vh;
}

header {
  background: linear-gradient(135deg, #1e3a5f 0%, #0f172a 100%);
  color: #e2e8f0;
  padding: 1.5rem 2rem;
  text-align: center;
}

header h1 {
  margin: 0 0 0.5rem 0;
  font-size: 1.75rem;
  font-weight: 700;
}

.tagline {
  margin: 0;
  font-size: 0.95rem;
  opacity: 0.9;
  max-width: 42rem;
  margin-left: auto;
  margin-right: auto;
}

/* Layout: desktop = controls left, instructions + results right. Mobile = instructions, controls, results. */
.main-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 320px 1fr;
  grid-template-rows: auto auto;
  grid-template-areas:
    "controls instructions"
    "controls results";
  gap: 2rem;
  align-items: start;
}

.main-grid .controls { grid-area: controls; }
.main-grid #instructions { grid-area: instructions; }
.main-grid .results { grid-area: results; }

@media (max-width: 900px) {
  .main-grid {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    grid-template-areas:
      "instructions"
      "controls"
      "results";
    padding: 1rem;
  }

  .main-grid .controls { position: static; }

  .chart-wrap {
    min-height: 280px;
    height: 280px;
  }
}

.controls {
  background: #fff;
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  position: sticky;
  top: 1rem;
}

.controls h2 {
  margin: 0 0 1rem 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: #334155;
}

.control-section {
  margin: 1.25rem 0 0.5rem 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: #475569;
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 0.25rem;
}

.control-section:first-of-type {
  margin-top: 0.75rem;
}

.control-group {
  margin-bottom: 1rem;
}

.control-group label {
  display: block;
  font-size: 0.85rem;
  color: #475569;
  margin-bottom: 0.35rem;
}

.label-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.35rem;
  flex-wrap: wrap;
}

.label-row label {
  margin-bottom: 0;
  flex: 0 1 auto;
}

.help-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.1rem;
  height: 1.1rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: #64748b;
  background: #e2e8f0;
  border-radius: 50%;
  cursor: pointer;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}

.help-icon:hover,
.help-icon:focus {
  color: #2563eb;
  background: #c7d2fe;
}

.help-popover {
  position: fixed;
  z-index: 1000;
  max-width: min(280px, calc(100vw - 24px));
  padding: 0.6rem 0.75rem;
  font-size: 0.85rem;
  line-height: 1.4;
  color: #334155;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.help-popover[hidden] {
  display: none !important;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.slider-row input[type='range'] {
  flex: 1;
  min-width: 0;
  height: 6px;
  accent-color: #2563eb;
}

.slider-row input[type='number'],
.control-group input[type='number'] {
  width: 6rem;
  padding: 0.35rem 0.5rem;
  font-size: 0.9rem;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  color: #1e293b;
}

.control-group input[type='number']#chartYMax {
  width: 5rem;
}

.slider-row input[type='number']:focus,
.control-group input[type='number']:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.control-group input[type='checkbox'] {
  margin-right: 0.5rem;
  accent-color: #2563eb;
}

.child-block {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: #f8fafc;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
}

.child-heading {
  margin: 0 0 0.5rem 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: #475569;
}

.checkbox-label {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.85rem;
  color: #334155;
}

.sub-label {
  display: block;
  font-size: 0.8rem;
  color: #64748b;
  margin-bottom: 0.25rem;
}

.control-hint {
  font-size: 0.85rem;
  color: #64748b;
  margin: -0.25rem 0 0.5rem 0;
}

.db-pensions-list {
  margin-bottom: 0.5rem;
}

.db-pension-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.5rem 1rem;
  margin-bottom: 0.75rem;
  padding: 0.75rem;
  background: #f8fafc;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
}

.db-pension-row .control-group {
  margin-bottom: 0;
}

.db-remove-btn {
  padding: 0.35rem 0.75rem;
  font-size: 0.85rem;
  color: #64748b;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  cursor: pointer;
  align-self: center;
}

.db-remove-btn:hover {
  color: #dc2626;
  border-color: #fecaca;
  background: #fef2f2;
}

.add-db-btn {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  color: #2563eb;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  cursor: pointer;
}

.add-db-btn:hover {
  background: #dbeafe;
}

.dc-pensions-list {
  margin-bottom: 0.5rem;
}

.dc-pension-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.5rem 1rem;
  margin-bottom: 0.75rem;
  padding: 0.75rem;
  background: #f8fafc;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
}

.dc-pension-row .control-group {
  margin-bottom: 0;
}

.dc-pension-row .dc-check-wrap {
  min-width: 220px;
}

.dc-contributions-end-age-wrap {
  transition: opacity 0.15s ease;
}

#regimePanel select,
#returnModel {
  width: 100%;
  padding: 0.35rem 0.5rem;
  font-size: 0.9rem;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  color: #1e293b;
  background: #fff;
}

#regimePanel select:focus,
#returnModel:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.regime-block {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: #f8fafc;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
}

.regime-heading {
  margin: 0 0 0.5rem 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: #475569;
}

.regime-input {
  width: 5rem;
}

.equilibrium-info {
  font-size: 0.8rem;
  color: #64748b;
  margin: 0.5rem 0 0 0;
  line-height: 1.4;
}

.chart-toggles {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.toggle-label {
  font-size: 0.85rem;
  color: #334155;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.toggle-label input[type='checkbox'] {
  accent-color: #2563eb;
}

.stat-model-label {
  margin: 0.75rem 0 0.25rem 0;
  padding-bottom: 0.2rem;
  border-bottom: 1px solid #e2e8f0;
  font-size: 0.9rem;
}

.stat-model-label:first-child {
  margin-top: 0;
}

#statsRegime .stat-model-label strong {
  color: #059669;
}

#statsStandard .stat-model-label strong {
  color: #2563eb;
}

.model-checkboxes .checkbox-label {
  margin-bottom: 0.15rem;
}

#runBtn,
#runBtnBottom {
  margin-top: 0;
  margin-bottom: 1rem;
  width: 100%;
  padding: 0.65rem 1rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: #2563eb;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

#runBtn:hover,
#runBtnBottom:hover {
  background: #1d4ed8;
}

#runBtnBottom {
  margin-top: 1rem;
  margin-bottom: 0;
}

.results {
  min-width: 0;
}

.loading {
  font-size: 0.95rem;
  color: #64748b;
  margin-bottom: 0.5rem;
}

.instructions {
  background: #fff;
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  font-size: 0.9rem;
  line-height: 1.55;
  color: #334155;
  min-height: 3rem;
}

.instructions h1 { font-size: 1.25rem; margin: 0 0 0.5rem 0; color: #1e293b; }
.instructions h2 { font-size: 1.05rem; margin: 1rem 0 0.35rem 0; color: #334155; }
.instructions h3 { font-size: 0.98rem; margin: 0.75rem 0 0.25rem 0; color: #475569; }
.instructions p { margin: 0.35rem 0; }
.instructions ul, .instructions ol { margin: 0.35rem 0; padding-left: 1.25rem; }
.instructions li { margin: 0.2rem 0; }
.instructions code { background: #f1f5f9; padding: 0.1em 0.35em; border-radius: 4px; font-size: 0.88em; }
.instructions strong { color: #1e293b; }

.stats {
  background: #fff;
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  transition: opacity 0.2s ease;
}

.stats p {
  margin: 0.4rem 0;
  font-size: 0.95rem;
}

.stats strong {
  color: #475569;
  font-weight: 600;
}

.stats .stat-note {
  font-size: 0.8rem;
  color: #64748b;
  margin-top: 0.25rem;
  font-style: normal;
}

.chart-wrap {
  background: #fff;
  border-radius: 12px;
  padding: 1rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  min-height: 320px;
  height: 360px;
}

.chart-wrap canvas {
  max-width: 100%;
  display: block;
}

footer {
  max-width: 1200px;
  margin: 2rem auto 0;
  padding: 1rem 2rem;
  font-size: 0.8rem;
  color: #64748b;
  text-align: center;
  border-top: 1px solid #e2e8f0;
}

footer code {
  background: #e2e8f0;
  padding: 0.1em 0.35em;
  border-radius: 4px;
  font-size: 0.9em;
}

.full-report-wrap {
  margin-top: 1.5rem;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

.full-report-wrap summary {
  padding: 0.75rem 1rem;
  font-weight: 600;
  color: #334155;
  cursor: pointer;
  user-select: none;
}

.full-report-wrap summary:hover {
  background: #f8fafc;
}

.full-report {
  margin: 0;
  padding: 1rem 1.25rem;
  font-family: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, monospace;
  font-size: 0.8rem;
  line-height: 1.4;
  color: #334155;
  background: #f8fafc;
  border-top: 1px solid #e2e8f0;
  overflow-x: auto;
  white-space: pre;
  max-height: 70vh;
  overflow-y: auto;
}