/* Shared page components used across unit pages.
   Load after style.css, before any page-specific stylesheet. */

/* Variant / notice banner */
.variant-banner {
  background: color-mix(in srgb, var(--accent) 10%, var(--bg-elevated));
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  border-radius: 12px;
  padding: 12px 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.variant-banner strong {
  color: var(--text);
}

/* Sticky in-page section navigation */
.subnav {
  position: sticky;
  top: var(--header-h, 57px);
  z-index: 15;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  margin: 0 -20px 36px;
  padding: 10px 20px;
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
}

.subnav a {
  display: inline-block;
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 6px 12px;
  border-radius: 999px;
  margin-right: 4px;
}

.subnav a:hover {
  background: var(--bg-elevated);
  color: var(--text);
}

/* Sections */
.unit-section {
  margin-top: 64px;
  scroll-margin-top: 120px;
}

.unit-section:first-of-type {
  margin-top: 0;
}

.unit-section h2 {
  font-size: 1.6rem;
  margin: 0 0 10px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}

.unit-section h3 {
  font-size: 1.12rem;
  margin: 36px 0 12px;
}

.unit-section p {
  max-width: 72ch;
  margin: 0 0 14px;
}

.section-intro {
  color: var(--text-muted);
  font-size: 1rem;
}

.aside {
  color: var(--text-muted);
  font-size: 0.9rem;
  border-left: 3px solid var(--border);
  padding-left: 14px;
}

/* Diagram frame */
.diagram-figure {
  margin: 24px 0;
  padding: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 14px;
}

.diagram-figure svg {
  width: 100%;
  height: auto;
  display: block;
  color: var(--text-muted);
}

.diagram-figure figcaption {
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Callout */
.callout {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 18px 20px;
  margin: 24px 0;
}

.callout h4 {
  margin: 0 0 8px;
  font-size: 0.95rem;
}

.callout p {
  margin: 0 0 8px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.callout p:last-child {
  margin-bottom: 0;
}

/* Card grid */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.spec-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.spec-card h4 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.spec-card p {
  margin: 0 0 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.spec-card p:last-child {
  margin-bottom: 0;
}

.spec-tag {
  font-size: 0.75rem !important;
  color: var(--accent) !important;
  font-weight: 600;
  margin: 0 !important;
}

/* Two-column comparison */
.compare-two {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin: 20px 0;
}

.compare-col {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.compare-col h4 {
  margin: 0 0 10px;
  font-size: 1.02rem;
  color: var(--accent);
}

.compare-col p {
  font-size: 0.9rem;
  margin: 0 0 10px;
}

.compare-col ul {
  margin: 0;
  padding-left: 18px;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.compare-col li {
  margin-bottom: 6px;
}

/* Interactive demos */
.demo-block {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  margin: 28px 0;
}

.demo-block h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

.demo-help {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin: 0 0 18px !important;
}

.demo-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 18px;
}

.demo-control label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.demo-control label .val {
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.demo-control input[type="range"] {
  width: 100%;
}

.demo-control select {
  width: 100%;
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 0.85rem;
}

.control-note {
  font-size: 0.78rem !important;
  color: var(--text-muted);
  margin: 4px 0 0 !important;
}

.demo-block canvas {
  display: block;
  width: 100%;
  height: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.readouts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.readout {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  text-align: center;
}

.readout__label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.readout__value {
  font-size: 1.15rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* Toggle chips (for feature/cue switches) */
.toggle-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.toggle-chip {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-muted);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 0.83rem;
  cursor: pointer;
  font-family: inherit;
}

.toggle-chip[aria-pressed="true"] {
  background: color-mix(in srgb, var(--accent) 16%, var(--bg));
  border-color: var(--accent);
  color: var(--text);
  font-weight: 600;
}

/* Data table */
.table-wrap {
  overflow-x: auto;
  margin: 20px 0;
}

table.spec-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.85rem;
  min-width: 620px;
}

table.spec-table th,
table.spec-table td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}

table.spec-table th {
  background: var(--bg-elevated);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-muted);
}

table.spec-table tbody tr:hover {
  background: var(--bg-elevated);
}

/* Self-check */
.qa {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  margin-bottom: 12px;
}

.qa summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.94rem;
}

.qa p {
  margin: 12px 0 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}