/* =========================================================
   Kansas Political History Timeline — Prairie Palette
   ========================================================= */

:root, [data-theme='light'] {
  /* 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(2.5rem, 1rem + 4.5vw, 5.5rem);

  /* 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;

  /* Prairie palette — parchment, wheat, sky, dust red */
  --color-bg: #f6efe0;            /* parchment */
  --color-surface: #fbf6e8;
  --color-surface-2: #fffaec;
  --color-surface-offset: #ebe1c8;
  --color-surface-offset-2: #ddd1b2;
  --color-divider: #d4c8a8;
  --color-border: #b9a877;

  --color-text: #2a2418;          /* deep walnut */
  --color-text-muted: #6b614a;
  --color-text-faint: #a89878;
  --color-text-inverse: #fbf6e8;

  --color-primary: #8b3a13;       /* dust red — Kansas earth */
  --color-primary-hover: #6f2e0e;
  --color-primary-active: #4e2009;
  --color-primary-highlight: #e9d1bf;

  --color-accent: #c49029;        /* wheat gold */
  --color-accent-hover: #a8771e;
  --color-accent-highlight: #f1e1b3;

  --color-sky: #3d6b8c;           /* prairie sky */
  --color-sky-highlight: #cfdbe6;

  --color-green: #4f6b2f;         /* sage / sunflower stem */
  --color-green-highlight: #d6dec3;

  /* Era accent strip colors (for filter chips & cards) */
  --era-populist:    #6e3a8a;     /* purple — 1890s */
  --era-progressive: #3d6b8c;     /* sky blue */
  --era-allen:       #b9520f;     /* burnt orange */
  --era-newdeal:     #4f6b2f;     /* sage */
  --era-midcentury:  #5d5341;     /* khaki */
  --era-frank:       #8b3a13;     /* dust red */
  --era-modern:      #c49029;     /* wheat gold */

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-xl: 22px;

  --shadow-sm: 0 1px 2px rgba(60, 40, 10, 0.08);
  --shadow-md: 0 6px 18px rgba(60, 40, 10, 0.12);
  --shadow-lg: 0 18px 40px rgba(60, 40, 10, 0.18);

  --transition-interactive: 220ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 680px;
  --content-default: 1040px;
  --content-wide: 1320px;

  --font-display: 'Source Serif 4', 'Source Serif Pro', Georgia, serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}

[data-theme='dark'] {
  --color-bg: #1a1611;
  --color-surface: #221d15;
  --color-surface-2: #2a241a;
  --color-surface-offset: #312a1f;
  --color-surface-offset-2: #3a3225;
  --color-divider: #3d3525;
  --color-border: #564a32;

  --color-text: #e9ddc1;
  --color-text-muted: #a89878;
  --color-text-faint: #756950;
  --color-text-inverse: #1a1611;

  --color-primary: #d9824a;
  --color-primary-hover: #e89866;
  --color-primary-active: #f0ab7e;
  --color-primary-highlight: #4a2e1b;

  --color-accent: #e6b863;
  --color-accent-hover: #f0c87e;
  --color-accent-highlight: #4a3a1a;

  --color-sky: #7ea9c9;
  --color-sky-highlight: #2a3d4d;

  --color-green: #95b06b;
  --color-green-highlight: #2d3a1d;

  --era-populist:    #b07cd0;
  --era-progressive: #7ea9c9;
  --era-allen:       #e89260;
  --era-newdeal:     #a3bd72;
  --era-midcentury:  #b5a684;
  --era-frank:       #df8c5d;
  --era-modern:      #ecc375;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 18px 40px rgba(0, 0, 0, 0.6);
}

/* =========================================================
   Layout primitives
   ========================================================= */

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin: 0 auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-10));
}

.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

/* =========================================================
   Header
   ========================================================= */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-divider);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: var(--space-3);
  gap: var(--space-4);
}
.brand {
  display: flex; align-items: center; gap: var(--space-3);
  text-decoration: none; color: var(--color-text);
}
.brand-mark { width: 36px; height: 36px; flex-shrink: 0; }
.brand-text {
  font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em;
  font-size: var(--text-base); line-height: 1.1;
}
.brand-text small {
  display: block; font-family: var(--font-body); font-weight: 400;
  color: var(--color-text-muted); font-size: var(--text-xs);
  letter-spacing: 0.08em; text-transform: uppercase;
}
.site-nav { display: flex; gap: var(--space-1); align-items: center; }
.site-nav a {
  color: var(--color-text-muted); text-decoration: none;
  padding: var(--space-2) var(--space-3); font-size: var(--text-sm);
  font-weight: 500; border-radius: var(--radius-sm);
}
.site-nav a:hover { color: var(--color-text); background: var(--color-surface-offset); }
.theme-toggle {
  width: 36px; height: 36px; display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--radius-md); color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.theme-toggle:hover { color: var(--color-text); background: var(--color-surface-offset); }

@media (max-width: 720px) {
  .site-nav a { display: none; }
  .site-nav a.nav-keep { display: inline-block; }
}

/* =========================================================
   Hero
   ========================================================= */

.hero {
  position: relative; overflow: hidden;
  padding-block: clamp(var(--space-12), 9vw, var(--space-24));
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-divider);
}
.hero::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background-image:
    radial-gradient(circle at 15% 30%, rgba(196,144,41,0.18), transparent 50%),
    radial-gradient(circle at 85% 70%, rgba(61,107,140,0.15), transparent 55%);
}
.hero-grain {
  position: absolute; inset: 0; pointer-events: none; opacity: 0.4; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.5 0 0 0 0 0.4 0 0 0 0 0.2 0 0 0 0.08 0'/></filter><rect width='200' height='200' filter='url(%23n)'/></svg>");
}
[data-theme='dark'] .hero-grain { opacity: 0.25; mix-blend-mode: screen; }
.hero .container { position: relative; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-body); font-size: var(--text-xs);
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--color-primary);
  font-weight: 600; margin-bottom: var(--space-4);
}
.hero-eyebrow::before {
  content: ''; width: 24px; height: 1px; background: var(--color-primary);
}
.hero h1 {
  font-family: var(--font-display); font-weight: 600;
  font-size: var(--text-hero); line-height: 1.0; letter-spacing: -0.025em;
  max-width: 20ch;
}
.hero h1 em {
  font-style: italic; color: var(--color-primary); font-weight: 500;
}
.hero-lede {
  margin-top: var(--space-6); max-width: 56ch;
  font-size: var(--text-lg); line-height: 1.5; color: var(--color-text-muted);
}
.hero-stats {
  margin-top: var(--space-12);
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-6); max-width: 720px;
}
.hero-stat {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-3);
}
.hero-stat .num {
  font-family: var(--font-display); font-weight: 600;
  font-size: var(--text-2xl); line-height: 1; color: var(--color-text);
  letter-spacing: -0.02em;
}
.hero-stat .lbl {
  margin-top: var(--space-2); font-size: 11px;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-text-muted);
  line-height: 1.4;
}

/* =========================================================
   Filters
   ========================================================= */

.filter-bar {
  position: sticky; top: 64px; z-index: 30;
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-divider);
  padding-block: var(--space-3);
}
.filter-bar > .filter-row {
  width: 100%; max-width: var(--content-wide);
  margin: 0 auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-10));
  display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center;
}
.filter-bar .label {
  font-size: var(--text-xs); letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-text-muted); font-weight: 600; margin-right: var(--space-2);
}
.chip {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: 6px var(--space-3); border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: var(--text-xs); font-weight: 500; color: var(--color-text-muted);
  cursor: pointer; user-select: none;
}
.chip:hover { background: var(--color-surface-offset); color: var(--color-text); }
.chip[aria-pressed='true'] {
  background: var(--color-text); color: var(--color-bg);
  border-color: var(--color-text);
}
.chip .dot {
  width: 8px; height: 8px; border-radius: 999px; background: var(--era-color, currentColor);
}
.chip[data-era='populist'] { --era-color: var(--era-populist); }
.chip[data-era='progressive'] { --era-color: var(--era-progressive); }
.chip[data-era='allen'] { --era-color: var(--era-allen); }
.chip[data-era='newdeal'] { --era-color: var(--era-newdeal); }
.chip[data-era='midcentury'] { --era-color: var(--era-midcentury); }
.chip[data-era='frank'] { --era-color: var(--era-frank); }
.chip[data-era='modern'] { --era-color: var(--era-modern); }

.search-input {
  flex: 1 1 180px; max-width: 280px; margin-left: auto;
  padding: 7px var(--space-3); border-radius: var(--radius-md);
  border: 1px solid var(--color-border); background: var(--color-surface);
  font-size: var(--text-sm); color: var(--color-text);
}
@media (max-width: 720px) {
  .search-input { margin-left: 0; max-width: 100%; flex-basis: 100%; }
}
.search-input::placeholder { color: var(--color-text-faint); }
.search-input:focus { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* =========================================================
   Timeline
   ========================================================= */

.timeline {
  position: relative;
  padding-block: var(--space-12);
}
.timeline::before {
  content: ''; position: absolute; left: 50%; top: 0; bottom: 0;
  width: 2px; background: linear-gradient(180deg,
    transparent 0%,
    var(--color-border) 6%,
    var(--color-border) 94%,
    transparent 100%);
  transform: translateX(-50%);
}

.era-header {
  position: relative;
  text-align: center;
  margin-block: var(--space-12) var(--space-8);
}
.era-header .pin {
  display: inline-flex; align-items: center; gap: var(--space-2);
  background: var(--color-bg);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: var(--text-xs); letter-spacing: 0.14em; text-transform: uppercase;
  font-weight: 600; color: var(--color-text);
  position: relative; z-index: 2;
}
.era-header .pin .dot {
  width: 10px; height: 10px; border-radius: 999px; background: var(--era);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--era) 25%, transparent);
}
.era-header h2 {
  margin-top: var(--space-4);
  font-family: var(--font-display); font-weight: 600;
  font-size: var(--text-2xl); letter-spacing: -0.02em;
}
.era-header .era-blurb {
  margin: var(--space-4) auto 0;
  max-width: 60ch; color: var(--color-text-muted);
  font-size: var(--text-base);
}

.event-row {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 56px 1fr;
  gap: var(--space-4);
  margin-block: var(--space-8);
  align-items: start;
}
.event-row.left .event-card { grid-column: 1; text-align: right; align-self: end; }
.event-row.left .event-side { grid-column: 3; }
.event-row.right .event-card { grid-column: 3; }
.event-row.right .event-side { grid-column: 1; align-self: end; text-align: right; }
.event-row .event-marker { grid-column: 2; }

.event-marker {
  display: flex; align-items: center; justify-content: center;
  position: relative; height: 100%;
  min-height: 56px;
}
.event-marker .node {
  width: 18px; height: 18px; border-radius: 999px;
  background: var(--era); border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--era), 0 0 0 8px color-mix(in srgb, var(--era) 18%, transparent);
  position: relative; z-index: 3;
  transition: transform var(--transition-interactive);
}
.event-row:hover .event-marker .node { transform: scale(1.2); }

.event-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  position: relative;
  transition: transform var(--transition-interactive),
              box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
}
.event-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--era);
}
.event-card::before {
  content: ''; position: absolute; left: 0; top: var(--space-5); bottom: var(--space-5);
  width: 3px; border-radius: 3px; background: var(--era);
}
.event-row.left .event-card::before { left: auto; right: 0; }

.event-year {
  font-family: var(--font-display); font-weight: 600;
  font-size: var(--text-xl); color: var(--era);
  letter-spacing: -0.02em; line-height: 1;
}
.event-title {
  margin-top: var(--space-2);
  font-family: var(--font-display); font-weight: 600;
  font-size: var(--text-lg); line-height: 1.2;
  color: var(--color-text);
}
.event-summary {
  margin-top: var(--space-3);
  font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.55;
}
.event-tags {
  margin-top: var(--space-4);
  display: flex; flex-wrap: wrap; gap: 6px;
}
.event-row.left .event-tags { justify-content: flex-end; }
.tag {
  font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase;
  font-weight: 600; color: var(--color-text-muted);
  padding: 3px 8px; border-radius: 999px;
  background: var(--color-surface-offset); border: 1px solid var(--color-divider);
}
.tag.frank {
  color: var(--era-frank);
  background: color-mix(in srgb, var(--era-frank) 12%, transparent);
  border-color: color-mix(in srgb, var(--era-frank) 30%, transparent);
}

/* expanded details */
.event-details {
  display: none;
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px dashed var(--color-divider);
  font-size: var(--text-sm); line-height: 1.6; color: var(--color-text);
  text-align: left;
}
.event-card.is-open .event-details { display: block; }
.event-row.left .event-card.is-open .event-details { text-align: right; }
.event-details p + p { margin-top: var(--space-3); }
.event-details .sources {
  margin-top: var(--space-4);
  font-size: var(--text-xs); color: var(--color-text-muted);
}
.event-details .sources strong {
  display: block; font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--color-text-faint);
  margin-bottom: var(--space-1); font-weight: 700;
}
.event-details a {
  color: var(--color-primary); text-decoration: underline; text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
.event-details a:hover { color: var(--color-primary-hover); }

.event-row.is-hidden { display: none; }

/* mobile timeline collapses to single column */
@media (max-width: 860px) {
  .timeline::before { left: 24px; }
  .event-row {
    grid-template-columns: 48px 1fr;
    gap: var(--space-3);
  }
  .event-row.left .event-card,
  .event-row.right .event-card {
    grid-column: 2; text-align: left;
  }
  .event-row.left .event-card::before,
  .event-row.right .event-card::before { left: 0; right: auto; }
  .event-row.left .event-tags,
  .event-row.right .event-tags { justify-content: flex-start; }
  .event-row.left .event-card.is-open .event-details { text-align: left; }
  .event-side { display: none; }
  .event-marker { grid-column: 1; justify-content: center; }
}

/* =========================================================
   Featured Callouts
   ========================================================= */

.callout-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-10);
}
.callout {
  background: linear-gradient(160deg, var(--color-surface) 0%, var(--color-surface-2) 100%);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  position: relative; overflow: hidden;
}
.callout::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--era), transparent);
}
.callout .kicker {
  font-size: var(--text-xs); letter-spacing: 0.14em; text-transform: uppercase;
  font-weight: 700; color: var(--era);
}
.callout h3 {
  margin-top: var(--space-3);
  font-family: var(--font-display); font-weight: 600;
  font-size: var(--text-xl); letter-spacing: -0.02em;
  line-height: 1.1;
}
.callout .years {
  margin-top: var(--space-1);
  font-family: var(--font-mono); font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.callout .quote {
  margin-top: var(--space-5);
  font-family: var(--font-display); font-style: italic;
  font-size: var(--text-lg); line-height: 1.35;
  color: var(--color-text);
  padding-left: var(--space-4);
  border-left: 2px solid var(--era);
}
.callout .quote-attr {
  display: block; margin-top: var(--space-2);
  font-style: normal; font-family: var(--font-body);
  font-size: var(--text-xs); color: var(--color-text-muted);
  letter-spacing: 0.06em; text-transform: uppercase; font-weight: 600;
}
.callout .body {
  margin-top: var(--space-5);
  font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.6;
}
.callout .body p + p { margin-top: var(--space-3); }
.callout .body strong { color: var(--color-text); font-weight: 600; }

/* =========================================================
   Intro & Quote section between hero and timeline
   ========================================================= */

.intro {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}
.intro .container {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: var(--space-12); align-items: start;
}
@media (max-width: 800px) {
  .intro .container { grid-template-columns: 1fr; gap: var(--space-8); }
}
.intro h2 {
  font-family: var(--font-display); font-weight: 600;
  font-size: var(--text-xl); line-height: 1.1; letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}
.intro p {
  font-size: var(--text-base); color: var(--color-text-muted);
  line-height: 1.65; max-width: 56ch;
}
.intro p + p { margin-top: var(--space-4); }
.intro .pull {
  border-left: 2px solid var(--color-primary);
  padding-left: var(--space-5);
  font-family: var(--font-display); font-style: italic;
  font-size: var(--text-lg); line-height: 1.4;
  color: var(--color-text);
}
.intro .pull cite {
  display: block; margin-top: var(--space-3);
  font-style: normal; font-family: var(--font-body);
  font-size: var(--text-xs); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--color-text-muted); font-weight: 600;
}

/* =========================================================
   Section headers
   ========================================================= */

.section-head {
  text-align: center; max-width: 720px; margin: 0 auto var(--space-12);
}
.section-head .eyebrow {
  font-size: var(--text-xs); letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--color-primary); font-weight: 700;
}
.section-head h2 {
  margin-top: var(--space-2);
  font-family: var(--font-display); font-weight: 600;
  font-size: var(--text-2xl); line-height: 1.05;
  letter-spacing: -0.02em;
}
.section-head p {
  margin-top: var(--space-4);
  color: var(--color-text-muted); font-size: var(--text-base);
  line-height: 1.6;
}

/* =========================================================
   Footer
   ========================================================= */

.site-footer {
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
  padding-block: var(--space-12);
  margin-top: var(--space-16);
}
.site-footer .container {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: var(--space-8);
}
@media (max-width: 720px) {
  .site-footer .container { grid-template-columns: 1fr; }
}
.site-footer h4 {
  font-family: var(--font-display); font-weight: 600;
  font-size: var(--text-base); margin-bottom: var(--space-3);
}
.site-footer p, .site-footer li {
  font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.6;
}
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: var(--space-2); }
.site-footer a {
  color: var(--color-text-muted); text-decoration: none;
  border-bottom: 1px solid transparent;
}
.site-footer a:hover { color: var(--color-text); border-bottom-color: var(--color-primary); }
.site-footer .colophon {
  margin-top: var(--space-8);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-divider);
  font-size: var(--text-xs); color: var(--color-text-faint);
  letter-spacing: 0.06em;
}

/* =========================================================
   Reveal animation
   ========================================================= */

.reveal {
  opacity: 0; transform: translateY(20px);
  transition: opacity 600ms cubic-bezier(0.16,1,0.3,1),
              transform 600ms cubic-bezier(0.16,1,0.3,1);
}
.reveal.is-in {
  opacity: 1; transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}