/* ============================================================
   ROOTS & RECKONING — Style Sheet
   Art direction: archival / investigative journalism aesthetic
   Palette: deep charcoal + warm amber/ochre accent + cream text
   ============================================================ */

/* ── DESIGN TOKENS ── */
:root {
  /* Type scale */
  --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);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Spacing */
  --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;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Archival color palette — light mode */
  --color-bg:             #f5f0e8;
  --color-surface:        #faf7f2;
  --color-surface-2:      #fff;
  --color-surface-offset: #ede6d8;
  --color-divider:        #d6cebf;
  --color-border:         #c9bfad;
  --color-text:           #1a1510;
  --color-text-muted:     #5c5040;
  --color-text-faint:     #a0917d;
  --color-text-inverse:   #f5f0e8;

  /* Amber/ochre accent */
  --color-primary:        #b85e00;
  --color-primary-hover:  #8f4800;
  --color-primary-active: #6b3400;
  --color-primary-subtle: #f0dcc4;

  /* Era colors */
  --color-exclusion:      #7b3f6e;   /* Deep plum — exclusion era */
  --color-arrival:        #2a6f47;   /* Forest green — arrival era */
  --color-empire:         #b85e00;   /* Amber — empire era */
  --color-reckoning:      #8b2020;   /* Dark crimson — reckoning era */

  /* Layout */
  --content-narrow: 640px;
  --content-default: 1000px;
  --content-wide: 1240px;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

  /* Transitions */
  --transition: 200ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(26, 21, 16, 0.08);
  --shadow-md: 0 4px 16px rgba(26, 21, 16, 0.12);
  --shadow-lg: 0 12px 40px rgba(26, 21, 16, 0.16);

  /* Fonts */
  --font-display: 'Zodiak', 'Georgia', serif;
  --font-body: 'Switzer', 'Helvetica Neue', sans-serif;
}

/* Dark mode */
[data-theme="dark"] {
  --color-bg:             #111009;
  --color-surface:        #1a1812;
  --color-surface-2:      #211f18;
  --color-surface-offset: #161410;
  --color-divider:        #2a2820;
  --color-border:         #3a3828;
  --color-text:           #e8e0d0;
  --color-text-muted:     #9a8f78;
  --color-text-faint:     #5a5448;
  --color-text-inverse:   #111009;
  --color-primary:        #e8840a;
  --color-primary-hover:  #f09530;
  --color-primary-active: #f5a84a;
  --color-primary-subtle: #3a2510;
  --color-exclusion:      #c47ab0;
  --color-arrival:        #5aae78;
  --color-empire:         #e8840a;
  --color-reckoning:      #e05050;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #111009;
    --color-surface:        #1a1812;
    --color-surface-2:      #211f18;
    --color-surface-offset: #161410;
    --color-divider:        #2a2820;
    --color-border:         #3a3828;
    --color-text:           #e8e0d0;
    --color-text-muted:     #9a8f78;
    --color-text-faint:     #5a5448;
    --color-text-inverse:   #111009;
    --color-primary:        #e8840a;
    --color-primary-hover:  #f09530;
    --color-primary-active: #f5a84a;
    --color-primary-subtle: #3a2510;
    --color-exclusion:      #c47ab0;
    --color-arrival:        #5aae78;
    --color-empire:         #e8840a;
    --color-reckoning:      #e05050;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
  }
}

/* ── BASE RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-16);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  hanging-punctuation: first last;
}
body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s;
}
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.15; font-family: var(--font-display); }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }
ul[role="list"], ol[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--color-primary-hover); }

::selection { background: color-mix(in oklab, 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; }
}

/* ── LAYOUT UTILITIES ── */
.container {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
}
.section-label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  line-height: 1.1;
}
.section-intro {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 60ch;
  margin-bottom: var(--space-10);
}

/* ── NAVIGATION ── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in oklab, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition: var(--transition);
}
.nav-inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-4) clamp(var(--space-6), 5vw, var(--space-16));
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  flex-shrink: 0;
}
.nav-logo:hover { color: var(--color-primary); }
.nav-links {
  display: flex;
  gap: var(--space-6);
  margin-left: auto;
}
.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--color-text); }
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: background var(--transition), color var(--transition);
  flex-shrink: 0;
}
.theme-toggle:hover { background: var(--color-surface-offset); color: var(--color-text); }

/* ── HERO ── */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  padding: var(--space-24) clamp(var(--space-6), 5vw, var(--space-16));
  background: var(--color-bg);
}
.hero-bg-pattern {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, color-mix(in oklab, var(--color-primary) 8%, transparent) 0%, transparent 60%),
    radial-gradient(circle at 80% 20%, color-mix(in oklab, var(--color-exclusion) 6%, transparent) 0%, transparent 50%),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 79px,
      color-mix(in oklab, var(--color-text) 3%, transparent) 79px,
      color-mix(in oklab, var(--color-text) 3%, transparent) 80px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 79px,
      color-mix(in oklab, var(--color-text) 3%, transparent) 79px,
      color-mix(in oklab, var(--color-text) 3%, transparent) 80px
    );
  pointer-events: none;
}
.hero-content {
  max-width: var(--content-default);
  margin-inline: auto;
  width: 100%;
  position: relative;
  z-index: 1;
}
.hero-eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-5);
}
.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 700;
  line-height: 0.95;
  color: var(--color-text);
  margin-bottom: var(--space-8);
  letter-spacing: -0.02em;
}
.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 52ch;
  line-height: 1.5;
  font-weight: 300;
  margin-bottom: var(--space-12);
}
.hero-scroll-cue {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  animation: float 3s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}
.hero-stats {
  position: relative;
  z-index: 1;
  max-width: var(--content-default);
  margin-inline: auto;
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-8);
  padding-top: var(--space-12);
  border-top: 1px solid var(--color-divider);
  margin-top: var(--space-16);
}
.stat { display: flex; flex-direction: column; gap: var(--space-1); }
.stat-num {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}
.stat-label { font-size: var(--text-xs); color: var(--color-text-muted); font-weight: 500; letter-spacing: 0.05em; }
.stat-divider { width: 1px; height: 48px; background: var(--color-divider); flex-shrink: 0; }

/* ── BACKGROUND SECTION ── */
.background {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}
.background-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(var(--space-8), 4vw, var(--space-16));
  align-items: start;
}
.background-text p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-5);
}
.background-text p strong { color: var(--color-text); font-weight: 600; }
.background-text p em { color: var(--color-text); font-style: italic; }
.background-cards { display: flex; flex-direction: column; gap: var(--space-4); }
.context-card {
  padding: var(--space-5) var(--space-6);
  border-radius: var(--radius-lg);
  border-left: 3px solid;
  background: var(--color-surface-2);
}
.context-card--zoning { border-color: var(--color-exclusion); }
.context-card--immigration { border-color: var(--color-arrival); }
.context-card--trafficking { border-color: var(--color-reckoning); }
.context-card-year {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-1);
}
.context-card--zoning .context-card-year { color: var(--color-exclusion); }
.context-card--immigration .context-card-year { color: var(--color-arrival); }
.context-card--trafficking .context-card-year { color: var(--color-reckoning); }
.context-card-title {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.context-card-body {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ── TIMELINE SECTION ── */
.timeline-section {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) 0;
}

/* Era filter buttons */
.era-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-10);
}
.era-btn {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full, 9999px);
  border: 1px solid var(--color-border);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.era-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.era-btn.active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
[data-theme="dark"] .era-btn.active { color: #111; }

/* Timeline layout */
.timeline {
  position: relative;
  padding-left: 100px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 58px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--color-divider);
}

/* Individual event */
.timeline-event {
  position: relative;
  margin-bottom: var(--space-8);
  transition: opacity var(--transition);
}
.timeline-event.hidden { display: none; }
.timeline-event.featured .event-year { color: var(--color-primary); }

.event-year-col {
  position: absolute;
  left: -100px;
  width: 84px;
  text-align: right;
  padding-right: var(--space-4);
  padding-top: var(--space-4);
}
.event-year {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-muted);
  white-space: nowrap;
  letter-spacing: 0.03em;
}
.featured .event-year { font-size: var(--text-base); color: var(--color-primary); }

.event-connector {
  position: absolute;
  left: -42px;
  top: var(--space-5);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1px;
  padding-top: 2px;
}
.event-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--color-bg);
  flex-shrink: 0;
  position: relative;
  left: -4px;
}
.dot--large { width: 16px; height: 16px; left: -7px; }
.dot--exclusion { background: var(--color-exclusion); }
.dot--arrival   { background: var(--color-arrival); }
.dot--empire    { background: var(--color-empire); }
.dot--reckoning { background: var(--color-reckoning); }

/* Event card */
.event-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  cursor: pointer;
  transition: box-shadow var(--transition), border-color var(--transition), background var(--transition);
  outline: none;
}
.event-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-text-faint);
}
.event-card:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.event-card--featured {
  border-color: color-mix(in oklab, var(--color-primary) 30%, var(--color-border));
  background: color-mix(in oklab, var(--color-primary) 3%, var(--color-surface));
}
[data-theme="dark"] .event-card--featured {
  background: color-mix(in oklab, var(--color-primary) 5%, var(--color-surface));
}
.event-card[aria-expanded="true"] { box-shadow: var(--shadow-md); }

.event-header { }
.event-tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-2);
}
.tag--exclusion { background: color-mix(in oklab, var(--color-exclusion) 15%, transparent); color: var(--color-exclusion); }
.tag--arrival   { background: color-mix(in oklab, var(--color-arrival) 15%, transparent);   color: var(--color-arrival); }
.tag--empire    { background: color-mix(in oklab, var(--color-empire) 15%, transparent);    color: var(--color-empire); }
.tag--reckoning { background: color-mix(in oklab, var(--color-reckoning) 15%, transparent); color: var(--color-reckoning); }

.event-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  line-height: 1.3;
}
.event-summary {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Expanded detail area */
.event-detail {
  display: none;
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-divider);
}
.event-card[aria-expanded="true"] .event-detail { display: block; }
.event-detail p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-4);
}
.event-detail p:last-of-type { margin-bottom: 0; }
.event-detail p strong { color: var(--color-text); font-weight: 600; }

/* Pull quote */
.pullquote {
  border-left: 3px solid var(--color-primary);
  padding: var(--space-4) var(--space-6);
  margin: var(--space-5) 0;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  font-style: italic;
  line-height: 1.5;
  background: color-mix(in oklab, var(--color-primary) 5%, transparent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}
.pullquote cite {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-style: normal;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-top: var(--space-2);
  letter-spacing: 0.03em;
}

/* Fact box */
.fact-box {
  background: color-mix(in oklab, var(--color-primary) 8%, var(--color-surface-offset, var(--color-surface)));
  border: 1px solid color-mix(in oklab, var(--color-primary) 20%, transparent);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: var(--space-5) 0;
  line-height: 1.65;
}
.fact-box strong { color: var(--color-primary); font-weight: 600; }

/* Source links */
.source-link {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-faint);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in oklab, var(--color-text-faint) 40%, transparent);
  transition: color var(--transition), border-color var(--transition);
  margin-top: var(--space-3);
  margin-right: var(--space-4);
}
.source-link:hover { color: var(--color-primary); border-color: var(--color-primary); }

/* ── MAP SECTION ── */
.map-section {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}
.map-section .container { margin-bottom: var(--space-8); }
.map-wrapper {
  width: 100%;
  max-width: var(--content-wide);
  margin: 0 auto var(--space-8);
}
#map-container {
  width: 100%;
  height: clamp(360px, 50vh, 540px);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
}
.map-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-8);
  margin-top: var(--space-4);
}
.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}
.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}
.legend-dot--zoning   { background: var(--color-exclusion); }
.legend-dot--reddy    { background: var(--color-empire); }
.legend-dot--ihouse   { background: var(--color-arrival); }
.legend-dot--bagai    { background: #4a90d9; }

/* ── AFTERMATH ── */
.aftermath {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) 0;
}
.aftermath-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
}
.aftermath-card {
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--transition), transform var(--transition);
}
.aftermath-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.aftermath-icon { font-size: 1.75rem; margin-bottom: var(--space-3); line-height: 1; }
.aftermath-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}
.aftermath-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}
.aftermath-card p strong { color: var(--color-text); font-weight: 600; }

/* ── SOURCES ── */
.sources-section {
  padding: clamp(var(--space-12), 6vw, var(--space-24)) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
}
.sources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-3);
}
.source-card {
  display: block;
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.source-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-sm); }
.source-card-title {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-1);
  line-height: 1.4;
}
.source-card-url {
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: 500;
}

/* ── FOOTER ── */
.site-footer {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-divider);
}
.site-footer p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: center;
  max-width: 60ch;
  margin: 0 auto;
}

/* ── LEAFLET DARK MODE OVERRIDE ── */
[data-theme="dark"] .leaflet-tile-pane { filter: brightness(0.7) invert(1) contrast(3) hue-rotate(200deg) saturate(0.3) brightness(0.7); }
[data-theme="dark"] .leaflet-container { background: #111009; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .background-grid { grid-template-columns: 1fr; }
  .timeline { padding-left: 68px; }
  .timeline::before { left: 36px; }
  .event-year-col { left: -68px; width: 52px; padding-right: var(--space-3); }
  .event-connector { left: -32px; }
  .hero-stats { flex-direction: column; align-items: flex-start; gap: var(--space-4); }
  .stat-divider { display: none; }
  .nav-links { display: none; }
  .era-filters { overflow-x: auto; flex-wrap: nowrap; padding-bottom: var(--space-2); }
}

@media (max-width: 480px) {
  .aftermath-grid { grid-template-columns: 1fr; }
  .sources-grid { grid-template-columns: 1fr; }
}

/* Animate-in on scroll */
.timeline-event {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, display 0s;
}
.timeline-event.visible {
  opacity: 1;
  transform: translateY(0);
}
.timeline-event.hidden {
  display: none !important;
  opacity: 0 !important;
}