/* Question card tool and category pages. Colors come from the shared theme variables. */
.qc-app { margin: 1.8em 0; padding: clamp(14px, 3vw, 24px); display: grid; gap: 18px; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface-hover); }
.qc-filter { display: grid; grid-template-columns: 5.5rem minmax(0, 1fr); gap: 8px 14px; align-items: start; }
.qc-filter-label { padding-top: 12px; font-weight: 800; color: var(--text-primary); font-size: .9rem; }
.qc-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.qc-chip { min-height: 44px; padding: 8px 14px; transition: background-color var(--transition-fast), border-color var(--transition-fast); border: 1px solid var(--color-border); border-radius: 999px; background: var(--color-surface); color: var(--text-secondary); font: inherit; font-weight: 700; cursor: pointer; }
.qc-chip:hover:not(.active) { border-color: var(--accent-blue); color: var(--text-primary); }
.qc-chip[aria-pressed="true"], .qc-chip.active { background: var(--color-primary-gradient); border-color: transparent; color: #fff; }
.qc-chip:focus-visible, .qc-btn:focus-visible, .qc-link-button:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent-blue) 45%, transparent); outline-offset: 3px; }
.qc-chip-count { opacity: .8; font-weight: 600; font-size: .85em; }

.qc-stage { perspective: 1200px; display: flex; justify-content: center; }
.qc-card { position: relative; width: min(100%, 520px); min-height: 300px; transform-style: preserve-3d; transition: transform .6s cubic-bezier(.4, 0, .2, 1); }
.qc-card.is-flipped { transform: rotateY(180deg); }
.qc-face { position: absolute; inset: 0; display: flex; flex-direction: column; gap: 12px; padding: 22px; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface); box-shadow: var(--shadow-card); backface-visibility: hidden; -webkit-backface-visibility: hidden; overflow: auto; }
.qc-front { align-items: center; justify-content: center; text-align: center; color: var(--text-secondary); background-image: repeating-linear-gradient(135deg, transparent 0 14px, color-mix(in srgb, var(--accent-blue) 7%, transparent) 14px 15px); }
.qc-front::after { content: ""; position: absolute; inset: 10px; border: 1px dashed var(--color-border); border-radius: calc(var(--radius-lg) - 8px); pointer-events: none; }
.qc-back { transform: rotateY(180deg); justify-content: flex-start; }
.qc-question { margin: 0; font-size: 1.25rem; line-height: 1.6; font-weight: 700; color: var(--text-primary); word-break: keep-all; }
.qc-badges { display: flex; flex-wrap: wrap; gap: 6px; }
.qc-badge { padding: 3px 10px; background: var(--color-surface-hover); border-radius: 999px; border: 1px solid var(--color-border); font-size: .78rem; font-weight: 800; color: var(--text-secondary); }
.qc-depth-light { color: var(--accent-emerald); }
.qc-depth-medium { color: var(--accent-amber); }
.qc-depth-deep { color: var(--accent-purple); }
.qc-memo { margin-top: auto; padding-top: 10px; border-top: 1px solid var(--color-border-subtle); }
.qc-memo summary { cursor: pointer; font-weight: 700; color: var(--link-ink); min-height: 32px; }
.qc-memo summary:focus-visible { outline: 3px solid var(--accent-blue); outline-offset: 3px; }
.qc-memo p { margin: 8px 0 0; font-size: .9rem; line-height: 1.6; color: var(--text-secondary); }

.qc-actions { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.qc-btn { min-height: 44px; padding: 10px 18px; border: 1px solid var(--color-border); border-radius: 999px; background: var(--color-surface); color: var(--text-primary); font: inherit; font-weight: 800; cursor: pointer; }
.qc-btn.primary { background: var(--color-primary-gradient); border-color: transparent; color: #fff; }
.qc-btn:hover:not(:disabled) { border-color: var(--accent-blue); }
.qc-btn.primary:hover:not(:disabled) { box-shadow: var(--shadow-glow); }
.qc-btn:disabled { opacity: .45; cursor: not-allowed; }
.qc-remaining { text-align: center; color: var(--text-muted); font-size: .85rem; min-height: 1.2em; margin: 0; }
.qc-hint { text-align: center; color: var(--text-secondary); margin: 0; }

.qc-candidates { padding: 14px 18px; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface); }
.qc-candidates li + li { border-top: 1px solid var(--color-border-subtle); }
.qc-candidates h2 { margin: 0 0 8px !important; font-size: 1.05rem; }
.qc-candidates ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.qc-candidates li { display: flex; align-items: center; justify-content: space-between; gap: 12px; line-height: 1.5; }
.qc-link-button { background: none; border: 0; color: var(--link-ink); font: inherit; font-weight: 700; cursor: pointer; min-height: 44px; padding: 0 8px; }

.question-list { padding-left: 22px; display: grid; gap: 14px; }
.question-list .q-note { margin: 4px 0 0; font-size: .86rem; color: var(--text-secondary); }

@media (prefers-reduced-motion: reduce) {
    .qc-card { transition: none; }
}
@media (max-width: 520px) {
    .qc-card { min-height: 340px; }
    .qc-filter { grid-template-columns: 1fr; }
    .qc-filter-label { padding-top: 0; }
    .qc-actions .qc-btn { flex: 1 1 calc(50% - 8px); padding-inline: 10px; }
}
@media print {
    .qc-app { display: none !important; }
}