/* ============================================================
   Adaptive Capacity Self-Assessment Tool
   Mobile-first responsive styles
   ============================================================ */

/* ---- Custom Properties ---- */
:root {
  /* Primary palette — indigo, warm studio feel */
  --color-primary: #4f46e5;
  --color-primary-dark: #4338ca;
  --color-primary-light: #e0e7ff;
  --color-primary-bg: #eef2ff;

  /* Semantic colors */
  --color-success: #047857;
  --color-success-light: #d1fae5;
  --color-success-strong: #065f46;
  --color-success-extra: #a7f3d0;
  --color-success-extra-text: #064e3b;
  --color-warning: #d97706;
  --color-warning-light: #fef3c7;
  --color-danger: #dc2626;
  --color-danger-light: #fee2e2;

  /* Neutrals — warm-tinted, not cold gray */
  --color-bg: #f7f6f4;
  --color-surface: #fefefe;
  --color-border: #e4e2df;
  --color-border-dark: #ccc9c4;
  --color-text: #1a1917;
  --color-text-secondary: #6b6860;
  --color-text-light: #9c9890;

  /* Footer */
  --color-footer-bg: #1a1917;
  --color-footer-text: #d1d5db;
  --color-footer-link: #a5b4fc;
  --color-footer-link-hover: #c7d2fe;
  --color-footer-border: #374151;
  --color-footer-muted: #9ca3af;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Typography */
  --font-body: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --line-height: 1.6;

  /* Layout */
  --container-max: 48rem;
  --container-wide: 64rem;
  --border-radius: 0.5rem;
  --border-radius-lg: 0.75rem;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
}

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

/* ---- Base ---- */
html {
  font-size: 100%;
  scroll-behavior: smooth;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--line-height);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  line-height: 1.25;
  font-weight: 700;
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); margin-bottom: var(--space-lg); }
h3 { font-size: var(--text-xl); margin-bottom: var(--space-md); }
h4 { font-size: var(--text-lg); margin-bottom: var(--space-sm); }

p { margin-bottom: var(--space-md); }
p:last-child { margin-bottom: 0; }

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}
a:hover { color: var(--color-primary-dark); }

strong { font-weight: 600; }

/* ---- Layout ---- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-2xl) 0;
}

/* ---- Screen reader only ---- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ---- Loading Overlay ---- */
#loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  gap: var(--space-lg);
}

#loading-overlay[hidden] { display: none; }

.spinner {
  width: 2.5rem;
  height: 2.5rem;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

#loading-overlay .error {
  color: var(--color-danger);
  font-weight: 600;
  text-align: center;
}

#loading-overlay .error-detail {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  text-align: center;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: inherit;
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1;
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  min-height: 2.75rem;
}

.btn:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border-color: var(--color-border-dark);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
}

/* ---- Hero ---- */
#hero {
  padding: var(--space-3xl) 0;
  text-align: center;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

#hero h1 {
  margin-bottom: var(--space-md);
  max-width: 36rem;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 32rem;
  margin: 0 auto var(--space-xl);
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
}

/* ---- Concept Explainer ---- */
#explainer {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

#explainer[hidden] { display: none; }

#explainer-text {
  margin-bottom: var(--space-xl);
}

.chart-container {
  position: relative;
  margin: var(--space-lg) 0;
  max-width: 100%;
  min-height: 24rem;
}

.chart-container canvas {
  max-width: 100%;
}

.attribution {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-align: center;
}

/* ---- Scatter Plot (Concept Explainer) ---- */
.scatter-wrapper {
  margin: var(--space-xl) 0;
}

.scatter-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 var(--space-md);
  line-height: 1.3;
}

.scatter-legends {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--space-md) var(--space-2xl);
  margin-bottom: var(--space-md);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.scatter-legend-color {
  display: grid;
  grid-template-columns: auto auto;
  align-items: center;
  gap: 3px 6px;
}

.scatter-legend-size {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 8px;
}

.scatter-swatch {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.scatter-legend-label {
  white-space: nowrap;
}

.scatter-size-circle {
  display: inline-block;
  border-radius: 50%;
  border: 1.5px solid var(--color-text-secondary);
  flex-shrink: 0;
}

.scatter-size-sm {
  width: 10px;
  height: 10px;
}

.scatter-size-md {
  width: 18px;
  height: 18px;
}

.scatter-size-lg {
  width: 28px;
  height: 28px;
}

.scatter-note {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-top: var(--space-sm);
}

.scatter-note a {
  color: var(--color-primary);
}

/* ---- Assessment Section ---- */
#assessment[hidden] { display: none; }

/* Privacy notice */
.notice {
  background: var(--color-primary-bg);
  border: 1px solid var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--space-xl);
  font-size: var(--text-sm);
}

/* Progress bar */
.progress {
  height: 0.5rem;
  background: var(--color-border);
  border-radius: 9999px;
  overflow: hidden;
  margin-bottom: var(--space-xl);
  position: relative;
}

.progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 9999px;
  transition: width 0.3s ease;
}

.progress-label {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-align: center;
  margin-top: var(--space-sm);
}

/* Steps */
.step { margin-bottom: var(--space-xl); }
.step[hidden] { display: none; }
.step h3 { color: var(--color-text); }

/* Tab toggle */
.tab-toggle {
  display: flex;
  gap: 0;
  margin-bottom: var(--space-lg);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.tab {
  flex: 1;
  padding: 0.625rem var(--space-md);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: 600;
  background: var(--color-surface);
  border: none;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: background 0.15s, color 0.15s;
}

.tab:not(:last-child) {
  border-right: 1px solid var(--color-border-dark);
}

.tab.active {
  background: var(--color-primary);
  color: #fff;
}

.tab:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: -3px;
}

.tab-panel[hidden] { display: none; }

/* Quiz */
.quiz-question { margin-bottom: var(--space-lg); }
.quiz-question[hidden] { display: none; }

.quiz-prompt {
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.quiz-option {
  display: block;
  width: 100%;
  padding: 0.875rem var(--space-md);
  text-align: left;
  font-family: inherit;
  font-size: var(--text-base);
  line-height: 1.4;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  color: var(--color-text);
}

.quiz-option:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-bg);
}

.quiz-option.selected {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  font-weight: 600;
}

.quiz-option:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* Quiz results — occupation list */
.quiz-results[hidden] { display: none; }

.occupation-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.occupation-option {
  display: block;
  width: 100%;
  padding: var(--space-md);
  text-align: left;
  font-family: inherit;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.occupation-option:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-bg);
}

.occupation-option.selected {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.occupation-option:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.occ-title {
  display: block;
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.occ-desc {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.4;
}

/* Search */
.search-wrapper {
  position: relative;
}

#search-input,
#input-metro {
  width: 100%;
  padding: 0.75rem var(--space-md);
  font-family: inherit;
  font-size: var(--text-base);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color 0.15s;
}

#search-input:focus,
#input-metro:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.search-list {
  position: absolute;
  z-index: 100;
  left: 0;
  right: 0;
  max-height: 20rem;
  overflow-y: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border-dark);
  border-top: none;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  box-shadow: var(--shadow-lg);
  list-style: none;
}

.search-list[hidden] { display: none; }

.search-item {
  padding: 0.625rem var(--space-md);
  cursor: pointer;
  font-size: var(--text-base);
  border-bottom: 1px solid var(--color-border);
  transition: background 0.1s;
}

.search-item:last-child { border-bottom: none; }

.search-item:hover,
.search-item:focus {
  background: var(--color-primary-light);
  outline: none;
}

.search-item strong {
  color: var(--color-primary-dark);
}

.no-results {
  padding: 0.625rem var(--space-md);
  color: var(--color-text-secondary);
  font-style: italic;
  font-size: var(--text-sm);
}

/* Hint text */
.hint {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-sm);
}

/* Dimension inline hints */
.dimension-hint {
  margin-bottom: var(--space-md);
}

.dimension-hint-toggle {
  background: none;
  border: none;
  padding: 0;
  font-size: var(--text-sm);
  color: var(--color-primary);
  cursor: pointer;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 2px;
}

.dimension-hint-toggle:hover {
  color: var(--color-primary-dark, #4338ca);
}

.dimension-hint-toggle[aria-expanded="true"] {
  margin-bottom: var(--space-xs);
}

.dimension-hint-body {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  background: var(--color-primary-bg);
  border-left: 3px solid var(--color-primary-light);
  padding: var(--space-sm) var(--space-md);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.dimension-hint-body p {
  margin: 0;
}

/* Input groups */
.input-group {
  margin-bottom: var(--space-lg);
}

.input-group label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.input-group input[type="number"] {
  width: 100%;
  max-width: 12rem;
  padding: 0.75rem var(--space-md);
  font-family: inherit;
  font-size: var(--text-lg);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color 0.15s;
}

.input-group input[type="number"]:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

/* Indicators */
.indicator {
  padding: var(--space-md);
  border-radius: var(--border-radius);
  font-weight: 600;
  margin-top: var(--space-md);
}

.indicator[hidden] { display: none; }

.indicator-danger {
  background: var(--color-danger-light);
  color: var(--color-danger);
  border-left: 4px solid var(--color-danger);
}

.indicator-warning {
  background: var(--color-warning-light);
  color: var(--color-warning);
  border-left: 4px solid var(--color-warning);
}

.indicator-success {
  background: var(--color-success-light);
  color: var(--color-success);
  border-left: 4px solid var(--color-success);
}

.indicator-success-strong {
  background: var(--color-success-light);
  color: var(--color-success-strong);
  border-left: 4px solid var(--color-success-strong);
}

.indicator-success-extra {
  background: var(--color-success-extra);
  color: var(--color-success-extra-text);
  border-left: 4px solid var(--color-success-extra-text);
}

/* Context cards */
.context-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-lg);
  margin-top: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.context-card[hidden] { display: none; }

.context-card h4 {
  color: var(--color-primary-dark);
}

.context-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.context-stats > div {
  display: flex;
  justify-content: space-between;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
}

.context-stats dt {
  color: var(--color-text-secondary);
  font-weight: 400;
}

.context-stats dd {
  font-weight: 600;
  text-align: right;
}

/* Step navigation */
.step-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.step-nav .btn[hidden] { display: none; }
.step-nav .btn-link[hidden] { display: none; }

.btn-link {
  font-family: inherit;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0.5rem;
  align-self: center;
}

.btn-link:hover {
  color: var(--color-danger);
}

/* ---- Results Dashboard ---- */
#results[hidden] { display: none; }

.results-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

/* Composite score display */
.score-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  text-align: center;
}

.score-circle {
  width: 8rem;
  height: 8rem;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: conic-gradient(
    var(--color-primary) calc(var(--score) * 3.6deg),
    var(--color-border) calc(var(--score) * 3.6deg)
  );
  position: relative;
  flex-shrink: 0;
}

.score-circle::before {
  content: '';
  position: absolute;
  inset: 0.5rem;
  border-radius: 50%;
  background: var(--color-surface);
}

.score-number {
  position: relative;
  z-index: 1;
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary);
  text-align: center;
  line-height: 1.2;
}

.score-suffix {
  position: relative;
  z-index: 1;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  font-weight: 600;
}

.score-context h3 {
  margin-bottom: var(--space-sm);
}

.ai-exposure-note {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg);
  border-radius: var(--border-radius);
}

/* Callouts */
.callouts-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.callout {
  padding: var(--space-lg);
  border-radius: var(--border-radius);
}

.callout-strong {
  background: var(--color-success-light);
  border-left: 4px solid var(--color-success);
}

.callout-weak {
  background: var(--color-warning-light);
  border-left: 4px solid var(--color-warning);
}

.callout h4 {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

/* Roadmap */
.roadmap-list {
  list-style: none;
  counter-reset: roadmap;
}

.roadmap-item {
  counter-increment: roadmap;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  padding-left: 2.5rem;
  position: relative;
}

.roadmap-item:last-child { border-bottom: none; }

.roadmap-item::before {
  content: counter(roadmap);
  position: absolute;
  left: 0;
  top: var(--space-md);
  width: 1.75rem;
  height: 1.75rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: 700;
}

.roadmap-item h4 {
  margin-bottom: var(--space-xs);
}

.roadmap-item p {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

/* Neighbors */
.neighbors-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.neighbor-card {
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-bg);
}

.neighbor-card h4 {
  font-size: var(--text-base);
  margin-bottom: var(--space-xs);
}

.neighbor-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.neighbor-stats span {
  white-space: nowrap;
}

/* Result action buttons */
#btn-copy-results,
#btn-restart {
  margin-top: var(--space-lg);
}

#btn-copy-results.copied,
#btn-copy-url.copied {
  color: var(--color-success);
  border-color: var(--color-success);
}

/* Share prompt */
.share-prompt {
  text-align: center;
  padding: var(--space-lg) var(--space-xl);
  margin-bottom: var(--space-lg);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

.share-prompt p {
  margin: 0 0 var(--space-md);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: var(--text-sm);
  min-height: auto;
}

/* ---- What-If Exploration Panel ---- */
.whatif-card {
  border: 1px solid var(--color-primary-light);
  background: var(--color-primary-bg);
}

.whatif-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-primary);
  text-align: left;
}

.whatif-toggle:hover {
  color: var(--color-primary-dark);
}

.whatif-toggle:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.whatif-toggle-icon {
  font-size: var(--text-sm);
}

.whatif-body {
  margin-top: var(--space-lg);
}

.whatif-body[hidden] {
  display: none;
}

.whatif-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-top: var(--space-md);
}

.whatif-slider-group label {
  display: block;
  font-weight: 600;
  font-size: var(--text-sm);
  margin-bottom: var(--space-xs);
}

.whatif-slider-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.whatif-range {
  flex: 1;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--color-border);
  border-radius: 9999px;
  outline: none;
  cursor: pointer;
}

.whatif-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid var(--color-surface);
  box-shadow: var(--shadow-sm);
  cursor: grab;
}

.whatif-range::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid var(--color-surface);
  box-shadow: var(--shadow-sm);
  cursor: grab;
}

.whatif-range:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.whatif-value-label {
  min-width: 3.5rem;
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
  text-align: right;
  white-space: nowrap;
}

.whatif-pct-label {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: 2px;
}

.whatif-metro-wrap {
  position: relative;
}

.whatif-metro-wrap .input {
  width: 100%;
}

.whatif-metro-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 100;
  max-height: 200px;
  overflow-y: auto;
  margin-top: 2px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-dark);
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  box-shadow: var(--shadow-lg);
  list-style: none;
  padding: 0;
}

.whatif-method-note {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  font-style: italic;
  margin-top: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface);
  border-left: 3px solid var(--color-warning);
  border-radius: var(--border-radius);
}

.whatif-delta {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

.btn-link {
  display: inline-block;
  margin-top: var(--space-md);
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-decoration: none;
  cursor: pointer;
}

.btn-link:hover {
  text-decoration: underline;
  color: var(--color-primary-dark);
}
.btn-link[hidden] { display: none; }

/* ---- Footer ---- */
#footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: var(--space-2xl) 0;
}

#footer h2 {
  color: #fff;
  font-size: var(--text-xl);
}

#footer a {
  color: var(--color-footer-link);
}

#footer a:hover {
  color: var(--color-footer-link-hover);
}

.copyright {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-footer-border);
  font-size: var(--text-sm);
  color: var(--color-footer-muted);
}

/* ---- Responsive ---- */
@media (min-width: 640px) {
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }

  .hero-actions {
    flex-direction: row;
    justify-content: center;
  }

  .context-stats {
    grid-template-columns: 1fr 1fr;
  }

  .score-display {
    flex-direction: row;
    text-align: left;
  }

  .callouts-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-xl);
  }

  .neighbor-stats {
    gap: var(--space-sm) var(--space-xl);
  }
}

/* ---- Dark Mode ---- */
@media (prefers-color-scheme: dark) {
  :root {
    /* Primary — indigo-400/500 for legibility on dark */
    --color-primary: #818cf8;
    --color-primary-dark: #6366f1;
    --color-primary-light: #312e81;
    --color-primary-bg: #1e1b4b;

    /* Semantic — lighter tones for dark backgrounds */
    --color-success: #34d399;
    --color-success-light: #022c22;
    --color-success-strong: #6ee7b7;
    --color-success-extra: #064e3b;
    --color-success-extra-text: #a7f3d0;
    --color-warning: #fbbf24;
    --color-warning-light: #292524;
    --color-danger: #f87171;
    --color-danger-light: #2d0a0a;

    /* Neutrals — dark slate, warm text */
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-border: #334155;
    --color-border-dark: #475569;
    --color-text: #f1f0ee;
    --color-text-secondary: #94a3b8;
    --color-text-light: #64748b;

    /* Shadows — deeper on dark */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.5);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.6);
  }

  /* Focus shadow uses indigo tint on dark */
  #search-input:focus,
  #input-metro:focus {
    box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.25);
  }

  .input-group input[type="number"]:focus {
    box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.25);
  }

  /* Footer stays dark in dark mode — keep existing tokens */
  #footer {
    border-top: 1px solid var(--color-border);
  }
}