/* ── Custom properties ─────────────────────────────── */
:root {
  --color-primary: #4a90d9;
  --color-text: #333;
  --color-text-muted: #555;
  --color-text-light: #777;
  --color-border: #ccc;
  --color-bg-control: #f5f5f5;
  --color-bg-hover: #e8e8e8;
  --color-bg-annotation: #f8f8f0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #fff;
  color: var(--color-text);
}

/* ── 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;
}

/* ── Layout ────────────────────────────────────────── */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px;
}

/* ── Controls ──────────────────────────────────────── */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
}

.toggle-group {
  display: inline-flex;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow: hidden;
}

.toggle-group button {
  padding: 6px 14px;
  border: none;
  background: var(--color-bg-control);
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: background 0.15s, color 0.15s;
}

.toggle-group button:not(:last-child) {
  border-right: 1px solid var(--color-border);
}

.toggle-group button.active {
  background: var(--color-primary);
  color: #fff;
}

.toggle-group button:hover:not(.active) {
  background: var(--color-bg-hover);
}

.playback {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 280px;
}

.playback button {
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-bg-control);
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: background 0.15s;
}

.playback button:hover {
  background: #e0e0e0;
}

.playback button.playing {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

#year-slider {
  flex: 1;
  cursor: pointer;
}

#year-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  min-width: 40px;
  text-align: center;
}

/* ── Chart ─────────────────────────────────────────── */
.chart-wrapper {
  position: relative;
  width: 100%;
}

#chart svg {
  display: block;
  width: 100%;
}

.chart-title {
  font-size: 20px;
  font-weight: 600;
  fill: var(--color-text);
}

.chart-subtitle {
  font-size: 12px;
  fill: var(--color-text-light);
}

.chart-credit {
  font-size: 10px;
  fill: var(--color-text-light);
}

.bar-name {
  font-size: 13px;
  font-weight: 600;
  fill: #fff;
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

.bar-group {
  font-size: 10px;
  fill: rgba(255,255,255,0.8);
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.bar-value {
  font-size: 13px;
  font-weight: 600;
  fill: var(--color-text);
}

.year-bg {
  font-size: 46px;
  font-weight: 800;
  fill: #ddd;
  text-anchor: end;
}

.tick text {
  font-size: 11px;
  fill: var(--color-text-light);
}

.tick line,
.domain {
  stroke: var(--color-border);
}

.grid line {
  stroke: #e8e8e8;
}

.grid .domain {
  stroke: none;
}

/* ── Annotation banner ─────────────────────────────── */
.annotation-banner {
  margin-top: 8px;
  padding: 12px 16px;
  background: var(--color-bg-annotation);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 6px 6px 0;
  font-size: 13px;
  line-height: 1.5;
  color: #444;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity 0.5s ease, max-height 0.5s ease, padding 0.5s ease, margin 0.5s ease;
}

.annotation-banner.visible {
  opacity: 1;
  max-height: 120px;
  padding: 12px 16px;
  margin-top: 8px;
}

.annotation-banner:not(.visible) {
  padding: 0 16px;
  margin-top: 0;
}

/* ── Analysis section ─────────────────────────────── */
.analysis-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 2px solid #e0e0e0;
}

.analysis-section > h1 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 32px;
}

.analysis-block {
  margin-bottom: 40px;
}

.analysis-block h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.analysis-block img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  margin: 12px 0;
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

.analysis-context {
  font-size: 13px;
  line-height: 1.6;
  color: #666;
  margin-bottom: 8px;
}

.analysis-findings {
  font-size: 14px;
  line-height: 1.6;
  color: #444;
}