/* Design Tokens */
:root {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --font-display: 'Cabinet Grotesk', Arial Black, sans-serif;
  --font-body: 'General Sans', Helvetica Neue, sans-serif;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --content-wide: 1200px;
}

:root, [data-theme="light"] {
  --color-bg: #faf5ef;
  --color-surface: #fdf9f4;
  --color-surface-2: #fff;
  --color-surface-offset: #f0e8dd;
  --color-border: #ddd1c2;
  --color-divider: #e6ddd0;
  --color-text: #2d2418;
  --color-text-muted: #7a6e5f;
  --color-text-faint: #b5a895;
  --color-text-inverse: #faf5ef;
  --color-primary: #c74b16;
  --color-primary-hover: #a53d12;
  --color-primary-active: #832f0e;
  --chart-1: #c74b16;
  --chart-2: #2d6a4f;
  --chart-3: #6b3fa0;
  --chart-4: #c69800;
  --chart-5: #1a6e8e;
  --chart-6: #a13544;
  --chart-7: #4a7c59;
  --chart-8: #d45d00;
  --chart-9: #5a4fcf;
  --chart-10: #c2782e;
  --chart-11: #3c8a7a;
  --chart-12: #9b2f76;
  --shadow-sm: 0 1px 2px rgba(45,36,24,0.06);
  --shadow-md: 0 4px 12px rgba(45,36,24,0.08);
  --shadow-lg: 0 12px 32px rgba(45,36,24,0.12);
}

[data-theme="dark"] {
  --color-bg: #1a1714;
  --color-surface: #211e1a;
  --color-surface-2: #282420;
  --color-surface-offset: #1e1b17;
  --color-border: #3d3830;
  --color-divider: #2e2a24;
  --color-text: #d8d0c4;
  --color-text-muted: #8a8074;
  --color-text-faint: #5a5348;
  --color-text-inverse: #1a1714;
  --color-primary: #e87a4a;
  --color-primary-hover: #f09060;
  --color-primary-active: #f4a880;
  --chart-1: #e87a4a;
  --chart-2: #52b788;
  --chart-3: #9b7fd4;
  --chart-4: #edb336;
  --chart-5: #4fadcf;
  --chart-6: #dd6974;
  --chart-7: #6daa75;
  --chart-8: #f08040;
  --chart-9: #8d80e8;
  --chart-10: #e8a660;
  --chart-11: #5fc4ae;
  --chart-12: #d163a7;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #1a1714;
    --color-surface: #211e1a;
    --color-surface-2: #282420;
    --color-surface-offset: #1e1b17;
    --color-border: #3d3830;
    --color-divider: #2e2a24;
    --color-text: #d8d0c4;
    --color-text-muted: #8a8074;
    --color-text-faint: #5a5348;
    --color-text-inverse: #1a1714;
    --color-primary: #e87a4a;
    --color-primary-hover: #f09060;
    --chart-1: #e87a4a;
    --chart-2: #52b788;
    --chart-3: #9b7fd4;
    --chart-4: #d4a332;
    --chart-5: #4fadcf;
    --chart-6: #dd6974;
    --chart-7: #6daa75;
    --chart-8: #c49070;
    --chart-9: #8d80e8;
    --chart-10: #e8a660;
    --chart-11: #5fc4ae;
    --chart-12: #d163a7;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.4);
  }
}

/* Base Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility; scroll-behavior: smooth; }
body { min-height: 100dvh; line-height: 1.6; font-family: var(--font-body); font-size: var(--text-base); color: var(--color-text); background-color: var(--color-bg); }
img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.15; }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }
::selection { background: color-mix(in srgb, var(--color-primary) 25%, transparent); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; } }
button { cursor: pointer; background: none; border: none; }
a, button, [role="button"] { transition: color var(--transition-interactive), background var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive); }

/* Header */
.site-header { position: sticky; top: 0; z-index: 100; background: color-mix(in srgb, var(--color-bg) 92%, transparent); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--color-divider); padding: var(--space-3) var(--space-6); }
.header-inner { max-width: var(--content-wide); margin: 0 auto; display: flex; justify-content: space-between; align-items: center; gap: var(--space-4); flex-wrap: wrap; }
.logo-group { display: flex; align-items: center; gap: var(--space-3); }
.logo-icon { width: 28px; height: 28px; color: var(--color-primary); flex-shrink: 0; }
.logo-text { font-family: var(--font-body); font-size: var(--text-sm); font-weight: 600; color: var(--color-text); letter-spacing: -0.01em; }
.header-controls { display: flex; align-items: center; gap: var(--space-4); }
.view-toggle { display: flex; gap: var(--space-1); background: var(--color-surface-offset); padding: var(--space-1); border-radius: var(--radius-full); }
.view-btn { font-size: var(--text-xs); font-weight: 500; padding: var(--space-2) var(--space-4); border-radius: var(--radius-full); color: var(--color-text-muted); white-space: nowrap; }
.view-btn:hover { color: var(--color-text); background: color-mix(in srgb, var(--color-primary) 8%, transparent); }
.view-btn.active { background: var(--color-primary); color: var(--color-text-inverse); }
.theme-toggle { display: flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: var(--radius-full); color: var(--color-text-muted); }
.theme-toggle:hover { background: var(--color-surface-offset); color: var(--color-text); }

/* Hero */
.hero { max-width: var(--content-wide); margin: 0 auto; padding: var(--space-10) var(--space-6) var(--space-6); text-align: center; }
.hero h1 { font-family: var(--font-display); font-size: var(--text-2xl); font-weight: 800; color: var(--color-text); letter-spacing: -0.02em; margin-bottom: var(--space-4); }
.subtitle { font-size: var(--text-base); color: var(--color-text-muted); max-width: 680px; margin: 0 auto; line-height: 1.65; }
.subtitle strong { color: var(--color-primary); font-weight: 600; }

/* Chart Section */
.chart-section { max-width: var(--content-wide); margin: 0 auto; padding: 0 var(--space-6) var(--space-8); position: relative; }
.chart-controls { display: flex; justify-content: center; margin-bottom: var(--space-4); }
.legend { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-5); justify-content: center; font-size: var(--text-xs); color: var(--color-text-muted); }
.legend-item { display: flex; align-items: center; gap: var(--space-2); cursor: pointer; padding: var(--space-1) var(--space-2); border-radius: var(--radius-sm); transition: opacity var(--transition-interactive); }
.legend-item:hover { opacity: 0.8; }
.legend-item.dimmed { opacity: 0.3; }
.legend-dot { width: 10px; height: 10px; border-radius: var(--radius-full); flex-shrink: 0; }
.chart-container { width: 100%; aspect-ratio: 16/10; min-height: 400px; background: var(--color-surface); border: 1px solid var(--color-divider); border-radius: var(--radius-lg); overflow: hidden; position: relative; }
.chart-container svg { width: 100%; height: 100%; }

/* Tooltip */
.tooltip { position: fixed; pointer-events: none; background: var(--color-surface-2); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--space-4); box-shadow: var(--shadow-lg); z-index: 200; opacity: 0; transition: opacity 150ms ease; max-width: 320px; font-size: var(--text-sm); }
.tooltip.visible { opacity: 1; }
.tooltip-title { font-weight: 600; font-size: var(--text-base); margin-bottom: var(--space-2); color: var(--color-text); }
.tooltip-population { font-size: var(--text-xl); font-weight: 700; font-family: var(--font-display); margin-bottom: var(--space-2); font-variant-numeric: tabular-nums; }
.tooltip-detail { color: var(--color-text-muted); line-height: 1.5; font-size: var(--text-xs); }
.tooltip-detail strong { color: var(--color-text); }

/* Stats Bar */
.stats-bar { max-width: var(--content-wide); margin: 0 auto; padding: 0 var(--space-6) var(--space-10); display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: var(--space-4); }
.stat-card { background: var(--color-surface); border: 1px solid var(--color-divider); border-radius: var(--radius-lg); padding: var(--space-5); text-align: center; }
.stat-value { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 700; color: var(--color-primary); font-variant-numeric: tabular-nums; }
.stat-label { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: var(--space-1); }

/* Info Section */
.info-section { max-width: var(--content-wide); margin: 0 auto; padding: 0 var(--space-6) var(--space-12); }
.info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--space-6); }
.info-card { background: var(--color-surface); border: 1px solid var(--color-divider); border-radius: var(--radius-lg); padding: var(--space-6); }
.info-card h3 { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 700; margin-bottom: var(--space-3); color: var(--color-text); }
.info-card p { font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.65; }

/* Map Section */
.map-section { max-width: var(--content-wide); margin: 0 auto; padding: 0 var(--space-6) var(--space-12); }
.map-header { text-align: center; margin-bottom: var(--space-6); }
.map-header h2 { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 700; color: var(--color-text); letter-spacing: -0.02em; margin-bottom: var(--space-2); }
.map-subtitle { font-size: var(--text-sm); color: var(--color-text-muted); max-width: 600px; margin: 0 auto; }
.map-wrapper { display: flex; gap: var(--space-6); align-items: flex-start; }
.map-container { flex: 1 1 auto; background: var(--color-surface); border: 1px solid var(--color-divider); border-radius: var(--radius-lg); overflow: hidden; min-height: 460px; position: relative; }
.map-container svg { width: 100%; height: 100%; display: block; }
.map-legend { flex: 0 0 160px; background: var(--color-surface); border: 1px solid var(--color-divider); border-radius: var(--radius-lg); padding: var(--space-5); display: flex; flex-direction: column; gap: var(--space-3); }
.map-legend-title { font-size: var(--text-xs); font-weight: 600; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: var(--space-1); }
.map-legend-item { display: flex; align-items: center; gap: var(--space-2); font-size: var(--text-xs); color: var(--color-text-muted); cursor: pointer; transition: opacity var(--transition-interactive); padding: var(--space-1) var(--space-2); border-radius: var(--radius-sm); }
.map-legend-item:hover { opacity: 0.8; background: var(--color-surface-offset); }
.map-legend-swatch { width: 14px; height: 14px; border-radius: 3px; flex-shrink: 0; }
.ca-county { stroke: var(--color-bg); stroke-width: 0.5; transition: opacity 200ms ease, filter 200ms ease; cursor: pointer; }
.ca-county:hover { opacity: 0.85; filter: brightness(1.12); stroke-width: 1.5; stroke: var(--color-primary); }
.county-label { font-family: var(--font-body); font-size: 7.5px; fill: var(--color-text); pointer-events: none; text-anchor: middle; font-weight: 500; paint-order: stroke; stroke: var(--color-bg); stroke-width: 2.5px; stroke-linejoin: round; }
.map-tooltip { position: fixed; pointer-events: none; background: var(--color-surface-2); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--space-4); box-shadow: var(--shadow-lg); z-index: 300; opacity: 0; transition: opacity 150ms ease; max-width: 280px; font-size: var(--text-sm); }
.map-tooltip.visible { opacity: 1; }
.map-tooltip-title { font-weight: 600; font-size: var(--text-base); margin-bottom: var(--space-2); color: var(--color-text); }
.map-tooltip-pop { font-size: var(--text-lg); font-weight: 700; font-family: var(--font-display); margin-bottom: var(--space-2); color: var(--color-primary); }
.map-tooltip-detail { color: var(--color-text-muted); line-height: 1.5; font-size: var(--text-xs); }
.map-tooltip-detail strong { color: var(--color-text); }
@media (max-width: 768px) { .map-wrapper { flex-direction: column; } .map-legend { flex: 1 1 auto; flex-direction: row; flex-wrap: wrap; gap: var(--space-2); } .map-legend-title { width: 100%; } .map-container { min-height: 360px; } }

/* Footer */
footer { max-width: var(--content-wide); margin: 0 auto; padding: var(--space-8) var(--space-6); border-top: 1px solid var(--color-divider); text-align: center; font-size: var(--text-xs); color: var(--color-text-faint); display: flex; flex-direction: column; gap: var(--space-2); }
footer a { color: var(--color-text-muted); text-decoration: none; }
footer a:hover { color: var(--color-primary); }

/* Bubble labels */
.bubble-label { font-family: var(--font-body); fill: var(--color-text-inverse); pointer-events: none; text-anchor: middle; font-weight: 600; }
.bubble-label-sm { font-size: 10px; }
.bubble-label-md { font-size: 12px; }
.bubble-label-lg { font-size: 14px; }
.bubble-label-xl { font-size: 16px; }
.bubble-sublabel { font-family: var(--font-body); fill: var(--color-text-inverse); pointer-events: none; text-anchor: middle; font-weight: 400; opacity: 0.85; font-size: 10px; }

/* Responsive */
@media (max-width: 768px) {
  .header-inner { flex-direction: column; gap: var(--space-3); }
  .view-toggle { flex-wrap: wrap; justify-content: center; }
  .view-btn { font-size: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem); padding: var(--space-1) var(--space-3); }
  .hero h1 { font-size: var(--text-xl); }
  .chart-container { aspect-ratio: 1/1; min-height: 350px; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .chart-container { aspect-ratio: 3/4; min-height: 300px; }
  .stats-bar { grid-template-columns: 1fr 1fr; }
}