/* ========================================
   Panel kit — shared surface DNA
   Primitives only: .tbp-panel | .tbp-card | .tbp-row
   (+ modifiers). No shell-class paint aliases.
   Markup must include the tbp-* class for paint.
   Page/shell classes own layout & type only.
   Media chrome (banner, filmstrip, photo chapters) exempt.
   See master plan §9 / redesign-css rule.
   ======================================== */

/* —— Panel: lifted content / tool well —— */
.tbp-panel {
  background: var(--panel-bg);
  border: var(--panel-border);
  border-radius: var(--panel-radius);
  padding: var(--panel-pad);
}

.tbp-panel--muted {
  background: var(--panel-bg-muted);
  border: var(--panel-border);
  border-radius: var(--panel-radius);
  padding: var(--panel-pad-sm);
}

.tbp-panel--frame {
  border: var(--panel-border);
  border-radius: var(--card-radius);
  background: transparent;
  padding: 0;
}

/* Section chrome inside panels */
.tbp-panel.doc-section > .doc-section__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-md);
  margin-bottom: var(--space-6);
}

.tbp-panel.doc-section > .doc-section__head .doc-section__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.tbp-panel.doc-section > .doc-section__head .doc-section__title .bi {
  color: var(--muted);
}

/* Tips examples (shared; document + classic song-new) */
.doc-tips kbd {
  background: var(--surface);
  color: var(--text);
  border: var(--border-width) solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.35em;
  font-size: 0.85em;
}

.doc-tips__example {
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--panel-bg-muted);
  border: var(--border-width) solid var(--border);
}

.doc-tips__example--good {
  color: var(--gray);
}

.doc-tips__example--bad {
  color: var(--muted);
}

/* —— Card: clickable destination / plan / selection tile —— */
.tbp-card {
  background: var(--panel-bg);
  border: var(--panel-border);
  border-radius: var(--card-radius);
  padding: var(--card-pad);
  transition: border-color 0.15s, background 0.15s;
}

.tbp-card:hover {
  border-color: var(--gray);
  background: var(--panel-bg-muted);
}

.tbp-card--featured {
  border-color: var(--red);
  background: var(--panel-bg-muted);
}

.tbp-card--featured:hover {
  border-color: var(--red);
  background: var(--panel-bg-muted);
}

.tbp-card.selected {
  border-color: var(--color-primary);
}

.tbp-card.selected:hover {
  border-color: var(--color-primary);
  background: var(--panel-bg);
}

.tbp-card--media {
  background: var(--panel-bg-muted);
  padding: 0;
  overflow: hidden;
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  height: 100%;
}

.tbp-card--media:hover {
  border-color: var(--border-hover);
  background: var(--panel-bg);
}

.tbp-card--dense {
  padding: var(--row-pad);
}

.tbp-card--static {
  cursor: default;
}

.tbp-card--static:hover {
  border-color: var(--border);
  background: var(--panel-bg);
}

/* —— Row: dense list / collect item (not a card) —— */
.tbp-row {
  background: var(--panel-bg-muted);
  border: var(--panel-border);
  border-radius: var(--row-radius);
  padding: var(--row-pad);
  transition: border-color 0.15s, background 0.15s;
  cursor: pointer;
}

.tbp-row:hover {
  border-color: var(--border-hover);
  background: var(--panel-bg);
}

/* Non-navigating rows (actions only) — no hand cursor */
.tbp-row.tbp-row--static {
  cursor: default;
}