/* ============================================================
   Screen · Tests catalog (/exam)
   3-col card grid · filter chips · search · lock semantics
   Reuses app-header from home.css, plus lock-overlay/badge
   ============================================================ */

.catalog {
  background: var(--gio-color-bg);
  min-height: 100vh;
  padding-bottom: var(--gio-space-9);
}
.catalog__container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--gio-space-7);
}
@media (max-width: 768px) { .catalog__container { padding: 0 var(--gio-space-4); } }

/* ---- Hero ---- */
.catalog-hero {
  padding: var(--gio-space-9) 0 var(--gio-space-7);
}
.catalog-hero__eyebrow {
  font-size: var(--gio-text-xs);
  font-weight: var(--gio-w-bold);
  letter-spacing: var(--gio-tracking-wide);
  text-transform: uppercase;
  color: var(--gio-color-action);
  margin-bottom: var(--gio-space-3);
}
.catalog-hero__title {
  font-family: var(--gio-font-display);
  font-size: clamp(32px, 4vw, 44px);
  font-weight: var(--gio-w-extrabold);
  letter-spacing: -0.025em;
  color: var(--gio-color-text-strong);
  margin: 0 0 var(--gio-space-3);
}
.catalog-hero__sub {
  font-size: var(--gio-text-base);
  color: var(--gio-color-text-muted);
  margin: 0 0 var(--gio-space-6);
  max-width: 56ch;
}

/* ---- Toolbar (chips + search) ---- */
/* catalog-toolbar / .catalog-chip / .catalog-toolbar__search 는 components/catalog.css 로 이관 (exam·course·store 공통) */

/* ---- Grid ---- */
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gio-space-5);
}
@media (max-width: 1024px) { .catalog-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .catalog-grid { grid-template-columns: 1fr; } }

/* ---- Test card ---- */
.test-card {
  display: flex; flex-direction: column;
  background: var(--gio-color-surface);
  border: 1px solid var(--gio-color-border);
  border-radius: var(--gio-radius-2xl);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: all var(--gio-dur-fast) var(--gio-ease-out);
  position: relative;
}
.test-card:hover {
  border-color: var(--gio-color-action);
  transform: translateY(-2px);
  box-shadow: var(--gio-shadow-md);
  text-decoration: none;
}
.test-card__thumb {
  position: relative;
  aspect-ratio: 16/9;
  background:
    linear-gradient(135deg,
      var(--gio-color-action-soft) 0%,
      var(--gio-color-accent-soft) 100%);
  display: grid; place-items: center;
  overflow: hidden;
}
.test-card__thumb-img {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%; height: 100%; object-fit: cover;
}
/* 라이트 테마: 어두운 배경 이미지가 흰 카드와 과하게 대비되지 않게 톤 완화 */
:root[data-theme="light"] .test-card__thumb-img {
  filter: brightness(1.1) contrast(0.92) saturate(0.93);
}
.test-card__thumb-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 3px;
  padding: var(--gio-space-4);
  background: linear-gradient(90deg,
    rgba(10,12,20,0.80) 0%,
    rgba(10,12,20,0.50) 42%,
    rgba(10,12,20,0) 72%);
}
.test-card__thumb-series {
  font-size: 11px;
  font-weight: var(--gio-w-bold);
  letter-spacing: var(--gio-tracking-wide);
  text-transform: uppercase;
  color: rgba(255,255,255,0.82);
}
.test-card__thumb-title {
  font-family: var(--gio-font-display);
  font-size: var(--gio-text-lg);
  font-weight: var(--gio-w-extrabold);
  color: #fff;
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-shadow: 0 1px 3px rgba(0,0,0,0.45);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.test-card__thumb::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--gio-font-display);
  font-size: 36px;
  font-weight: var(--gio-w-extrabold);
  color: rgba(255,255,255,0.4);
  letter-spacing: -0.02em;
}
.test-card[data-mod="academic"] .test-card__thumb::after { content: 'A'; }
.test-card[data-mod="general"] .test-card__thumb::after { content: 'G'; }
.test-card__thumb--image::after { content: none !important; }
.test-card__thumb-badge {
  position: absolute;
  top: var(--gio-space-3);
  left: var(--gio-space-3);
  z-index: 2;
}
.test-card__lock {
  position: absolute;
  top: var(--gio-space-3);
  right: var(--gio-space-3);
  z-index: 2;
}
.test-card__body {
  padding: var(--gio-space-5);
  display: flex; flex-direction: column; gap: var(--gio-space-3);
  flex: 1;
}
.test-card__title {
  font-size: var(--gio-text-lg);
  font-weight: var(--gio-w-bold);
  color: var(--gio-color-text-strong);
  margin: 0;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.test-card__meta {
  display: flex; gap: var(--gio-space-4);
  font-size: var(--gio-text-xs);
  color: var(--gio-color-text-muted);
}
.test-card__meta-item { display: inline-flex; align-items: center; gap: 4px; }
.test-card__foot {
  margin-top: auto;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--gio-space-2);
  padding-top: var(--gio-space-3);
  border-top: 1px solid var(--gio-color-divider);
}
.test-card__band {
  font-family: var(--gio-font-display);
  font-size: var(--gio-text-lg);
  font-weight: var(--gio-w-extrabold);
  color: var(--gio-color-success);
  letter-spacing: -0.02em;
}
.test-card__band-label {
  font-size: 10px;
  color: var(--gio-color-text-muted);
  letter-spacing: var(--gio-tracking-wide);
  text-transform: uppercase;
  font-weight: var(--gio-w-bold);
  display: block;
}
.test-card__cta {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 7px 14px;
  border-radius: var(--gio-radius-pill);
  background: var(--gio-color-action);
  color: #fff;
  font-size: var(--gio-text-sm);
  font-weight: var(--gio-w-bold);
  letter-spacing: -0.01em;
  white-space: nowrap;
  transition: background 0.15s ease;
}
.test-card:hover .test-card__cta {
  background: var(--gio-color-action-hover);
}
.test-card--locked .test-card__cta {
  background: var(--gio-color-action-soft);
  color: var(--gio-color-action);
}

/* Locked variant */
.test-card--locked .test-card__thumb {
  filter: grayscale(0.6) brightness(0.85);
}
.test-card--locked .test-card__lock-icon {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 1;
  pointer-events: none;
}
.test-card--locked .test-card__lock-icon span {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: rgba(0,0,0,0.55);
  color: white;
  display: grid; place-items: center;
  font-size: 18px;
  backdrop-filter: blur(4px);
}

/* ---- Pagination footer ---- */
.catalog-footer {
  margin-top: var(--gio-space-9);
  display: flex; flex-direction: column;
  align-items: center;
  gap: var(--gio-space-3);
}
.catalog-footer__count {
  font-size: var(--gio-text-sm);
  color: var(--gio-color-text-muted);
}

/* ---- Empty state shell ---- */
.catalog-empty {
  grid-column: 1 / -1;
  padding: var(--gio-space-9) var(--gio-space-5);
  border: 1px dashed var(--gio-color-border-strong);
  border-radius: var(--gio-radius-2xl);
  background: var(--gio-color-surface);
}