/* ── Light-mode tokens (default) ───────────────────────────────── */
.crd-viewer {
  --crd-surface: var(--md-default-bg-color, #fff);
  --crd-surface-muted: var(--md-code-bg-color, #f5f5f5);
  --crd-border: var(--md-default-fg-color--lightest, rgba(0, 0, 0, 0.07));
  --crd-border-strong: var(--md-default-fg-color--lighter, rgba(0, 0, 0, 0.12));
  --crd-text: var(--md-default-fg-color, rgba(0, 0, 0, 0.87));
  --crd-text-muted: var(--md-default-fg-color--light, rgba(0, 0, 0, 0.54));
  --crd-primary: var(--md-primary-fg-color, #7b1fa2);
  --crd-primary-light: color-mix(in srgb, var(--crd-primary) 12%, transparent);
  --crd-primary-lighter: color-mix(in srgb, var(--crd-primary) 6%, transparent);
  --crd-accent: var(--md-accent-fg-color, #00acc1);
  --crd-status: #2e7d32;
  --crd-status-light: rgba(46, 125, 50, 0.08);
  --crd-required: #e53935;
  --crd-chip-bg: var(--md-code-bg-color, rgba(0, 0, 0, 0.04));
  --crd-chip-text: var(--md-default-fg-color--light, #546e7a);
  --crd-chip-border: var(--md-default-fg-color--lightest, rgba(0, 0, 0, 0.07));
  --crd-row-hover: color-mix(in srgb, var(--crd-primary) 4%, transparent);
  --crd-shadow: 0 2px 4px -1px rgba(0, 0, 0, 0.06), 0 1px 2px -1px rgba(0, 0, 0, 0.04);
  --crd-radius: 0.5rem;
  --crd-radius-sm: 0.375rem;
  --crd-transition: 180ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Dark-mode overrides ──────────────────────────────────────── */
[data-md-color-scheme="slate"] .crd-viewer {
  --crd-row-hover: color-mix(in srgb, var(--crd-primary) 14%, transparent);
  --crd-status: #66bb6a;
  --crd-status-light: rgba(102, 187, 106, 0.1);
  --crd-required: #ef5350;
}

/* ── Collapsed mode ──────────────────────────────────────────── */
.crd-viewer[data-crd-collapsible]>.crd-viewer__header {
  cursor: pointer;
}

.crd-viewer[data-crd-collapsed="true"]>.crd-viewer__header {
  border-bottom: none;
}

.crd-viewer[data-crd-collapsed="true"]>.crd-viewer__section,
.crd-viewer[data-crd-collapsed="true"]>.crd-viewer__header>.crd-viewer__toggle {
  display: none;
}

/* ── Main viewer container ────────────────────────────────────── */
.crd-viewer {
  margin: 1rem 0;
  border: 1px solid var(--crd-border);
  border-radius: var(--crd-radius);
  background: var(--crd-surface);
  box-shadow: var(--crd-shadow);
  overflow: clip;
  transition: box-shadow var(--crd-transition);
}

.crd-viewer:hover {
  box-shadow: var(--crd-shadow-hover);
}

/* ── Header ───────────────────────────────────────────────────── */
.crd-viewer__header {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--crd-border);
  background: var(--crd-surface-muted);
}

.crd-viewer__title,
.crd-viewer__meta,
.crd-viewer__section-title,
.crd-viewer__section-description,
.crd-viewer__description {
  margin: 0;
}

.crd-viewer__title {
  font-size: 0.95rem;
  font-weight: 700;
  font-family: var(--md-text-font-family, sans-serif);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--crd-text);
}

.crd-viewer__meta {
  margin-top: 0.125rem;
  color: var(--crd-text-muted);
  font-size: 0.72rem;
  font-family: var(--md-code-font-family, monospace);
  letter-spacing: 0.01em;
}

/* ── Expand / Collapse button ─────────────────────────────────── */
.crd-viewer__toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border: 1px solid var(--crd-border-strong);
  border-radius: var(--crd-radius-sm);
  padding: 0.375rem 0.75rem;
  background: var(--crd-surface);
  color: var(--crd-text-muted);
  font-size: 0.7rem;
  font-weight: 600;
  font-family: var(--md-text-font-family, sans-serif);
  letter-spacing: 0.02em;
  line-height: 1.2;
  cursor: pointer;
  transition: all var(--crd-transition);
  white-space: nowrap;
}

.crd-viewer__toggle:hover {
  border-color: var(--crd-primary);
  color: var(--crd-primary);
  background: var(--crd-primary-lighter);
}

/* ── Sections (Spec / Status) ─────────────────────────────────── */
.crd-viewer__section {
  padding: 0.75rem;
}

.crd-viewer__section+.crd-viewer__section {
  border-top: 1px solid var(--crd-border);
}

.crd-viewer__section-title {
  display: inline-flex;
  align-items: center;
  font-size: 0.65rem;
  font-weight: 700;
  font-family: var(--md-text-font-family, sans-serif);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: var(--crd-radius-sm);
  background: var(--crd-primary-light);
  color: var(--crd-primary);
}

.crd-viewer__section-description {
  margin-top: 0.375rem;
  color: var(--crd-text-muted);
  font-size: 0.78rem;
  line-height: 1.45;
  font-family: var(--md-text-font-family, sans-serif);
}

.crd-viewer__section--status .crd-viewer__section-title {
  background: var(--crd-status-light);
  color: var(--crd-status);
}

/* ── Tree & Children ──────────────────────────────────────────── */
.crd-viewer__tree,
.crd-viewer__children {
  list-style: none !important;
  margin: 0.5rem 0 0;
  padding: 0;
}

.crd-viewer__tree li,
.crd-viewer__children li {
  list-style: none !important;
}

.crd-viewer__tree li::before,
.crd-viewer__children li::before {
  content: none !important;
}

.crd-viewer__children {
  margin-left: 0.75rem;
  padding-left: 0.75rem;
  border-left: 1px solid var(--crd-border);
}

.crd-viewer__item+.crd-viewer__item {
  margin-top: 0;
}

/* ── Node (expandable) & Leaf ─────────────────────────────────── */
.crd-viewer__node,
.crd-viewer__item--leaf {
  border: none;
  border-radius: var(--crd-radius-sm);
  background: var(--crd-surface);
  padding: 0;
  transition: box-shadow var(--crd-transition);
}

.crd-viewer__node[data-open="true"] {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

/* ── Row layout (shared between summary + leaf) ───────────────── */
.crd-viewer__row {
  position: relative;
}

.crd-viewer__summary,
.crd-viewer__leaf-row {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 0.5rem;
  align-items: center;
  padding: 0.3rem 2rem 0.3rem 0.625rem;
  cursor: default;
}

.crd-viewer__summary {
  width: 100%;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  border-radius: var(--crd-radius-sm);
  font-family: inherit;
  transition: background var(--crd-transition);
}

.crd-viewer__summary:hover,
.crd-viewer__leaf-row:hover {
  background: var(--crd-row-hover);
}

/* ── Chevron indicator ────────────────────────────────────────── */
.crd-viewer__chevron,
.crd-viewer__leaf-spacer {
  width: 1.125rem;
  height: 1.125rem;
  border-radius: var(--crd-radius-sm);
  background: transparent;
  flex-shrink: 0;
}

.crd-viewer__leaf-spacer {
  background: transparent;
}

.crd-viewer__chevron {
  position: relative;
}

.crd-viewer__chevron::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0.3rem;
  height: 0.3rem;
  border-right: 1.5px solid var(--crd-primary);
  border-bottom: 1.5px solid var(--crd-primary);
  transform: translate(-60%, -50%) rotate(-45deg);
  transition: transform var(--crd-transition);
}

.crd-viewer__node[data-open="true"]>.crd-viewer__row .crd-viewer__chevron::before {
  transform: translate(-50%, -60%) rotate(45deg);
}

/* ── Label ────────────────────────────────────────────────────── */
.crd-viewer__label {
  min-width: 0;
  overflow-wrap: break-word;
  font-family: var(--md-code-font-family, monospace);
  font-size: 0.7rem;
  font-weight: 500;
  line-height: 1.3;
  color: var(--crd-text);
}

.crd-viewer__required {
  color: var(--crd-required);
  margin-left: 0.125rem;
  font-weight: 700;
}

/* ── Type badge ───────────────────────────────────────────────── */
.crd-viewer__badge {
  justify-self: start;
  padding: 0.125rem 0.5rem;
  border-radius: var(--crd-radius-sm);
  background: var(--crd-chip-bg);
  border: 1px solid var(--crd-chip-border);
  color: var(--crd-chip-text);
  font-size: 0.55rem;
  font-weight: 600;
  font-family: var(--md-code-font-family, monospace);
  white-space: nowrap;
  letter-spacing: 0.01em;
  line-height: 1.4;
}

/* ── Permalink anchor ─────────────────────────────────────────── */
.crd-viewer__anchor {
  position: absolute;
  top: 50%;
  right: 0.5rem;
  transform: translateY(-50%);
  width: 1.25rem;
  height: 1.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--crd-radius-sm);
  border: 1px solid var(--crd-border);
  background: var(--crd-surface);
  color: var(--crd-text-muted);
  text-decoration: none;
  opacity: 0;
  transition: opacity var(--crd-transition), border-color var(--crd-transition);
  font-size: 0;
}

.crd-viewer__anchor::before {
  content: "#";
  font-size: 0.65rem;
  font-weight: 700;
  line-height: 1;
}

.crd-viewer__row:hover .crd-viewer__anchor,
.crd-viewer__leaf-row:hover .crd-viewer__anchor,
.crd-viewer__anchor:focus-visible {
  opacity: 1;
}

.crd-viewer__anchor:hover {
  border-color: var(--crd-primary);
  color: var(--crd-primary);
}

/* ── Hash-navigation highlight ────────────────────────────────── */
.crd-viewer__row--highlight {
  background-color: color-mix(in srgb, var(--crd-primary) 18%, transparent);
  border-radius: var(--crd-radius-sm);
  transition: background-color 0.6s ease-out;
}

/* ── Body (description + facts) ───────────────────────────────── */
.crd-viewer__body {
  margin: 0 0.625rem 0.5rem 2.375rem;
  padding-top: 0;
}

.crd-viewer__description {
  color: var(--crd-text-muted);
  font-size: 0.75rem;
  line-height: 1.5;
  font-family: var(--md-text-font-family, sans-serif);
}

.crd-viewer__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-top: 0.25rem;
}

.crd-viewer__fact {
  padding: 0.125rem 0.4rem;
  border-radius: var(--crd-radius-sm);
  background: var(--crd-chip-bg);
  border: 1px solid var(--crd-chip-border);
  color: var(--crd-chip-text);
  font-size: 0.62rem;
  font-family: var(--md-code-font-family, monospace);
  line-height: 1.4;
}

.crd-viewer__fact strong {
  font-weight: 700;
}

/* ── Content (animated expand) ────────────────────────────────── */
.crd-viewer__content {
  overflow: hidden;
  transition: max-height var(--crd-transition), opacity var(--crd-transition);
}

.crd-viewer__content[hidden] {
  display: block;
  max-height: 0;
  opacity: 0;
  pointer-events: none;
}

.crd-viewer__content:not([hidden]) {
  max-height: none;
  opacity: 1;
}

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 720px) {
  .crd-viewer__header {
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem;
  }

  .crd-viewer__section {
    padding: 0.625rem;
  }

  .crd-viewer__summary,
  .crd-viewer__leaf-row {
    gap: 0.375rem;
    padding: 0.5rem 1.75rem 0.5rem 0.5rem;
  }

  .crd-viewer__anchor {
    opacity: 1;
    right: 0.375rem;
  }

  .crd-viewer__children {
    margin-left: 0.5rem;
    padding-left: 0.5rem;
  }

  .crd-viewer__body {
    margin: 0 0.5rem 0.5rem 2rem;
  }
}