/* ---- Case-study-only tokens (extend style.css) ---- */
:root {
  --hard: #B8873A;
  --danger: #A63D40;
  --normal: #4C7A5E;
}

/* ---- Minimal top bar ---- */
.cs-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--grid-line);
}
.cs-topbar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.85rem var(--edge);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.cs-back {
  border-bottom: 1px solid var(--grid-line);
  padding-bottom: 2px;
}
.cs-back:hover { border-color: var(--blue); color: var(--blue); }
.cs-mark { letter-spacing: 0.06em; color: var(--ink-soft); }

/* ---- Hero ---- */
.cs-hero { max-width: var(--max-width); margin: 0 auto; padding: clamp(2.5rem, 7vw, 4.5rem) var(--edge) clamp(2rem, 5vw, 3rem); }
.cs-hero .eyebrow { margin-bottom: 1.1rem; }
.cs-hero .headline { max-width: 22ch; }
.cs-hero .subhead { margin-top: 1.4rem; max-width: 62ch; }
.subhead strong, .part-intro strong, .metric-note strong { color: var(--ink); font-weight: 600; }

.cs-source {
  margin-top: 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
}

/* ---- Bottle-rack figure ---- */
.bottle-figure {
  margin-top: 2.5rem;
  border: 1px solid var(--grid-line);
  background: var(--paper-raised);
  padding: 1.5rem clamp(1rem, 3vw, 2rem);
}
.bottle-racks {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem clamp(1.5rem, 4vw, 3rem);
  justify-content: center;
}
.bottle-rack { display: flex; flex-direction: column; align-items: center; gap: 0.85rem; }
.bottle-rack svg { display: block; }
.bottle-rack figcaption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  text-align: center;
  line-height: 1.5;
}
.bottle-rack figcaption strong { color: var(--ink); font-weight: 600; }
.bottle-figure-caption {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--grid-line);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--ink-soft);
}
.bottle-figure-caption strong { color: var(--ink); font-weight: 600; }

/* ---- Legend / reference card ---- */
.legend-card {
  margin-top: 2.5rem;
  border: 1px solid var(--ink);
  background: var(--paper-raised);
}
.legend-card-head {
  padding: 1rem clamp(1rem, 3vw, 1.75rem);
  border-bottom: 1px solid var(--grid-line);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--brass);
}
.legend-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.legend-table td { padding: 0.7rem clamp(1rem, 3vw, 1.75rem); border-bottom: 1px solid var(--grid-line); vertical-align: top; }
.legend-table tr:last-child td { border-bottom: none; }
.legend-code {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--blue);
  white-space: nowrap;
  width: 4.5rem;
}
.legend-formula {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-soft);
  white-space: nowrap;
  width: 30%;
}
.legend-meaning { color: var(--ink); }

/* ---- Difficulty legend chips (reused across charts) ---- */
.diff-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  margin-top: 0.75rem;
}
.diff-legend span { display: inline-flex; align-items: center; gap: 0.4rem; }
.diff-swatch { width: 10px; height: 10px; display: inline-block; }
.diff-swatch.is-normal { background: var(--normal); }
.diff-swatch.is-hard { background: var(--hard); }
.diff-swatch.is-superhard { background: var(--danger); }
.diff-swatch.is-mechanic { width: 14px; height: 0; border-top: 1.5px dashed var(--ink-soft); }

/* ---- Parts ---- */
.part { border-top: 1px solid var(--grid-line); }
.part-alt { background: var(--paper-raised); }
.part-inner { max-width: var(--max-width); margin: 0 auto; padding: clamp(2.75rem, 6vw, 4rem) var(--edge); }
.part-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--brass);
  margin-bottom: 0.75rem;
}
.part-title {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  color: var(--ink);
  max-width: 32ch;
}
.part-intro {
  margin-top: 1rem;
  max-width: 66ch;
  color: var(--ink-soft);
  line-height: 1.65;
}
.part-body { margin-top: 2rem; }

/* ---- Chart cards ---- */
.chart-card {
  border: 1px solid var(--grid-line);
  background: var(--paper-raised);
  padding: clamp(1.25rem, 3vw, 1.75rem);
}
.chart-card h4 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink);
}
.chart-canvas-wrap { position: relative; height: 260px; margin-top: 1rem; }
.chart-canvas-wrap.is-tall { height: 320px; }
.chart-canvas-wrap.is-short { height: 210px; }

.chart-grid-2 { display: grid; grid-template-columns: 1fr; gap: 1.5rem; }
.chart-grid-2.cols-2 { grid-template-columns: repeat(2, 1fr); }

/* ---- Metric mini-grid (M1/M2/M5/M3/M7/M6) ---- */
.metric-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.metric-card {
  border: 1px solid var(--grid-line);
  background: var(--paper-raised);
  padding: clamp(1.1rem, 2.5vw, 1.5rem);
  display: flex;
  flex-direction: column;
}
.metric-card-head { display: flex; align-items: baseline; gap: 0.75rem; }
.code-chip {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--blue);
  border: 1px solid var(--blue);
  padding: 0.15em 0.5em;
}
.metric-card-head h4 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--ink);
}
.metric-note { margin-top: 0.85rem; color: var(--ink-soft); font-size: 0.92rem; line-height: 1.6; }

/* ---- Insight callouts ---- */
.insight {
  margin-top: 1.75rem;
  border-left: 3px solid var(--blue);
  background: var(--paper-raised);
  padding: 1.1rem 1.4rem;
  max-width: 72ch;
}
.insight p {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--ink);
}
.insight p + p { margin-top: 0.75rem; }
.insight strong { font-style: normal; font-weight: 600; color: var(--blue); }

/* ---- Correlation heatmap ---- */
.corr-scroll { overflow-x: auto; margin-top: 1.5rem; }
.corr-grid {
  display: grid;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  min-width: 560px;
}
.corr-cell {
  padding: 0.6rem 0.4rem;
  text-align: center;
  border: 1px solid var(--paper);
}
.corr-cell.is-header {
  background: transparent;
  color: var(--ink-soft);
  font-weight: 600;
}
.corr-cell.is-rowhead {
  background: transparent;
  color: var(--ink-soft);
  font-weight: 600;
  text-align: right;
  padding-right: 0.75rem;
}

/* ---- Data table ---- */
.data-details { margin-top: 1.5rem; }
.data-details summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--blue);
  border: 1px solid var(--blue);
  padding: 0.65em 1.1em;
  display: inline-block;
  user-select: none;
}
.data-details[open] summary { margin-bottom: 1.25rem; }
.data-details summary::-webkit-details-marker { display: none; }
.table-scroll { overflow-x: auto; border: 1px solid var(--grid-line); }
.data-table {
  border-collapse: collapse;
  width: 100%;
  min-width: 900px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
}
.data-table th, .data-table td {
  padding: 0.5rem 0.65rem;
  border-bottom: 1px solid var(--grid-line);
  text-align: right;
  white-space: nowrap;
}
.data-table th { color: var(--ink-soft); font-weight: 600; text-transform: uppercase; letter-spacing: 0.02em; font-size: 0.68rem; }
.data-table td:first-child, .data-table th:first-child { text-align: left; }
.data-table td:nth-child(2), .data-table th:nth-child(2) { text-align: left; }
.data-table tr.is-hard td { background: color-mix(in srgb, var(--hard) 12%, transparent); }
.data-table tr.is-superhard td { background: color-mix(in srgb, var(--danger) 12%, transparent); }

/* ---- Floating glossary widget ---- */
.glossary-float {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 300px;
  max-width: calc(100vw - 32px);
  background: var(--paper-raised);
  border: 1px solid var(--ink);
  box-shadow: 0 12px 28px rgba(20, 32, 43, 0.22);
  z-index: 60;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.glossary-float.is-shown { opacity: 1; transform: translateY(0); pointer-events: auto; }
.glossary-float.is-dragging { transition: none; box-shadow: 0 18px 36px rgba(20, 32, 43, 0.3); }

.glossary-handle {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.7rem 0.85rem;
  cursor: grab;
  touch-action: none;
  user-select: none;
  border-bottom: 1px solid var(--grid-line);
}
.glossary-float.is-collapsed .glossary-handle { border-bottom: none; }
.glossary-handle:active { cursor: grabbing; }
.glossary-grip { color: var(--grid-line); font-size: 0.95rem; line-height: 1; }
.glossary-title {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--brass);
}
.glossary-chevron {
  font-family: var(--font-mono);
  color: var(--ink-soft);
  transform: rotate(90deg);
  transition: transform 0.2s ease;
  line-height: 1;
}
.glossary-float.is-collapsed .glossary-chevron { transform: rotate(0deg); }

.glossary-body {
  max-height: min(50vh, 420px);
  overflow-y: auto;
}
.glossary-float.is-collapsed .glossary-body { display: none; }
.glossary-body .legend-table { font-size: 0.82rem; }
.glossary-body .legend-table td { padding: 0.55rem 0.85rem; }
.glossary-body .legend-formula { display: none; }

@media (max-width: 640px) {
  .glossary-float { right: 16px; bottom: 16px; width: 260px; }
}

/* ---- Responsive ---- */
@media (max-width: 760px) {
  .metric-grid { grid-template-columns: 1fr; }
  .chart-grid-2.cols-2 { grid-template-columns: 1fr; }
  .legend-formula { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}