:root {
  --bg: #f9f7f1;
  --ink: #1a1a1a;
  --ink-soft: #2a2a2a;
  --muted: #6b6b6b;
  --rule: #d8d4ca;
  --panel: #ffffff;
  --d: #2f6cb1;
  --r: #b8323a;
  --i: #6b6b6b;
  --w: #7a5c8c;
  --f: #c08a3e;
  --other: #4a4a4a;
  --accent: #1a1a1a;
  --highlight: #c08a3e;     /* amber — used for "procedural" / "swing" highlights so they don't read as Republican red */
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
}

a { color: var(--ink); text-decoration: underline; text-decoration-color: var(--rule); }
a:hover { text-decoration-color: var(--ink); }
kbd {
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 0.85em;
  padding: 1px 6px;
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: var(--panel);
}

/* HERO */
.hero {
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 32px;
}

.hero h1 {
  font-family: "Iowan Old Style", "Palatino", Georgia, serif;
  font-size: clamp(48px, 7vw, 88px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.05;
  max-width: 18ch;
  margin-bottom: 16px;
}

.hero .subtitle {
  font-size: clamp(18px, 2vw, 22px);
  color: var(--muted);
  max-width: 36ch;
  margin-bottom: 48px;
}

.hero .hint { color: var(--muted); font-size: 14px; }

/* SCROLLY LAYOUT */
.scrolly {
  position: relative;
  display: grid;
  grid-template-columns: minmax(360px, 0.45fr) minmax(0, 0.55fr);
  gap: 0;
  max-width: 1480px;
  margin: 0 auto;
  padding: 0 40px;
}

@media (max-width: 900px) {
  .scrolly { grid-template-columns: 1fr; }
}

/* VIZ COLUMN — sticky.
   `align-self: start` is essential: without it, CSS Grid's default
   `align-items: stretch` makes this column fill the entire grid row
   (~13 × 100vh of scenes). Sticky positioning then has no room to
   actually stick — the column already covers the whole scrolly, and
   the viz appears to vanish after the hero. */
.viz-column {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 24px 0 24px 32px;
  order: 2;
}

@media (max-width: 900px) {
  .viz-column { order: 1; height: 70vh; padding: 0; }
}

.viz-stage {
  position: relative;
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow: hidden;
}

#viz {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.viz-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 5;
}

.viz-overlay > * { pointer-events: auto; }
.viz-overlay > .senator-card { pointer-events: none; }

.viz-readout {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 8px 16px;
  padding: 12px 16px;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 4px;
  font-size: 13px;
  min-height: 64px;
}

.readout-cell { display: flex; flex-direction: column; gap: 2px; }
.readout-label {
  color: var(--muted);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.readout-value {
  font-family: "SF Mono", "Menlo", monospace;
  font-variant-numeric: tabular-nums;
  font-size: 16px;
  font-weight: 500;
}

/* PROSE COLUMN */
.prose-column {
  order: 1;
  padding-right: 32px;
}

.scene {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 0;
  max-width: 36em;
}

.scene h2 {
  font-family: "Iowan Old Style", "Palatino", Georgia, serif;
  font-size: clamp(28px, 3vw, 36px);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin-bottom: 20px;
}

.scene p {
  margin-bottom: 16px;
  color: var(--ink-soft);
}

.scene .hint {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}

.scene em { font-style: italic; color: var(--ink); }
.scene strong { font-weight: 600; }

.scene code {
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 0.9em;
  background: var(--panel);
  padding: 1px 6px;
  border-radius: 3px;
  border: 1px solid var(--rule);
}

.vote-yea { color: var(--r); font-weight: 600; }
.vote-nay { color: var(--d); font-weight: 600; }

.math-block {
  margin: 24px 0;
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 4px;
  text-align: center;
  font-size: 1.1em;
  overflow-x: auto;
}

.math-block .katex { font-size: 1.15em; }

.scene-outro {
  min-height: 70vh;
  text-align: left;
}

.scene-outro .caption {
  margin-top: 32px;
  color: var(--muted);
  font-size: 13px;
}

/* HOVER PANEL (inside viz overlay during scatter scenes) */
.senator-card {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(255,255,255,0.96);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 14px 16px;
  width: 240px;
  font-size: 13px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
  pointer-events: none;
}

.senator-card .photo {
  display: block;
  width: 64px;
  height: 64px;
  object-fit: cover;
  border-radius: 4px;
  margin-bottom: 8px;
  background: #e8e3d7;
}

.senator-card .name {
  font-family: "Iowan Old Style", "Palatino", Georgia, serif;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.2;
  margin-bottom: 4px;
}

.senator-tile { cursor: pointer; }

.senator-card .meta {
  color: var(--muted);
  margin-bottom: 12px;
  font-size: 12px;
}

.senator-card .pill {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 99px;
  color: white;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-right: 4px;
}

.senator-card dl {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 12px;
  margin: 0;
  padding-top: 8px;
  border-top: 1px solid var(--rule);
}

.senator-card dt { color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: 0.04em; }
.senator-card dd {
  font-family: "SF Mono", "Menlo", monospace;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

/* CONTROLS row beneath the viz stage (only used in scene 8 for the time slider) */
.viz-controls {
  margin-top: 12px;
  display: none;  /* shown only when scene populates it */
}
.viz-controls:not(:empty) { display: block; }

/* TIME SLIDER (scene 8) — kept deliberately minimal so the native range widget
   isn't interfered with. No accent-color, no custom height, no transforms. */
.time-slider {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 12px 14px;
}

.time-slider .row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.time-slider button {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border: 1px solid var(--rule);
  background: var(--panel);
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  font-family: inherit;
}

.time-slider button:hover { background: var(--bg); }

.time-slider input[type=range] {
  flex: 1 1 auto;
  min-width: 0;
}

/* Custom DIV slider — replaces native <input type="range"> */
.time-slider .track {
  flex: 1 1 auto;
  position: relative;
  height: 24px;
  cursor: pointer;
  user-select: none;
  touch-action: none;
  display: flex;
  align-items: center;
}

.time-slider .track::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 50%;
  height: 6px;
  margin-top: -3px;
  background: var(--rule);
  border-radius: 3px;
}

.time-slider .track-fill {
  position: absolute;
  left: 0; top: 50%;
  height: 6px;
  margin-top: -3px;
  background: var(--ink);
  border-radius: 3px;
  width: 0;
  pointer-events: none;
}

.time-slider .track-thumb {
  position: absolute;
  top: 50%;
  width: 18px;
  height: 18px;
  margin-top: -9px;
  margin-left: -9px;
  background: var(--ink);
  border: 2px solid var(--panel);
  border-radius: 50%;
  pointer-events: none;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}

.time-slider .track:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 4px;
  border-radius: 3px;
}

.time-slider .label {
  flex: 0 0 auto;
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  margin-left: 8px;
}

.time-slider button {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border: 1px solid var(--rule);
  background: var(--panel);
  border-radius: 50%;
  cursor: pointer;
  font-size: 12px;
  pointer-events: auto;
}

.time-slider input[type=range] {
  flex: 1 1 auto;
  min-width: 0;
  height: 24px;
  accent-color: var(--ink);
  cursor: pointer;
  pointer-events: auto;
}

.time-slider .label {
  flex: 0 0 auto;
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  white-space: nowrap;
}

/* DOTS — colors for SVG */
.dot { cursor: pointer; transition: stroke-width 120ms ease; }
.dot.D { fill: var(--d); }
.dot.R { fill: var(--r); }
.dot.I { fill: var(--i); }
.dot.W { fill: var(--w); }
.dot.F { fill: var(--f); }
.dot.Other { fill: var(--other); }
.dot.gray { fill: #9a948a !important; }
.dot:hover { stroke: var(--ink); stroke-width: 2px; }
.dot.swing { stroke: var(--highlight); stroke-width: 2.5px; }
.dot.label { font-size: 11px; fill: var(--ink); pointer-events: none; }

/* AXES */
.axis { color: var(--muted); }
.axis path, .axis line { stroke: var(--rule); shape-rendering: crispEdges; }
.axis text {
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 10px;
  fill: var(--muted);
}
.axis .tick line { stroke-opacity: 0.3; }
.axis-label {
  font-family: inherit;
  font-size: 12px;
  fill: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.zero-line {
  stroke: var(--rule);
  stroke-dasharray: 2 4;
  shape-rendering: crispEdges;
}

/* MATRIX (scene 2) */
.matrix-cell.yea { fill: var(--r); }
.matrix-cell.nay { fill: var(--d); }
.matrix-cell.abs { fill: #f0ece4; }

/* SCREE bars (scene 9) */
.scree-bar { fill: var(--ink); }
.scree-bar.highlight { fill: var(--r); }
.scree-title {
  font-family: "Iowan Old Style", "Palatino", Georgia, serif;
  font-size: 16px;
  font-weight: 500;
  fill: var(--ink);
}
.scree-pct {
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 10px;
  fill: var(--muted);
}

/* RF importances (scene 12) */
.imp-bar { fill: var(--ink); }
.imp-bar.procedural { fill: var(--highlight); }
.imp-label {
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 11px;
  fill: var(--ink);
}
.imp-pct {
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 10px;
  fill: var(--muted);
}
.imp-tooltip {
  background: rgba(255,255,255,0.96);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 10px 14px;
  font-size: 12px;
  width: 280px;
  position: absolute;
  pointer-events: none;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}

/* K-MEANS centroids */
.centroid {
  fill: none;
  stroke: var(--ink);
  stroke-width: 2.5;
}

/* MATH (scene 5) */
.math-rotation-label {
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 11px;
  fill: var(--muted);
}