/* ============================================================
   EXAM CARD – APEX LIQUID GLASS (2 cột)
   ============================================================ */

.ex-card {
  display: block;
  text-decoration: none;
  color: inherit;
  border-radius: var(--lg-radius-lg, 16px);
  overflow: hidden;
  background: var(--lg-bg-glass-card, rgba(255, 255, 255, 0.85));
  backdrop-filter: var(--lg-blur-base, blur(20px));
  -webkit-backdrop-filter: var(--lg-blur-base, blur(20px));
  border: var(--lg-border-glass, 1px solid rgba(255, 255, 255, 0.6));
  box-shadow: var(--lg-shadow-sm, 0 4px 16px rgba(0, 0, 0, 0.04));
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.25s ease;
  will-change: transform;
  transform: translateZ(0);
}

.ex-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--lg-shadow-md, 0 8px 32px rgba(31, 38, 135, 0.12));
  border-color: var(--color-primary, #4CAF50);
}

/* Inner container: 2 cột */
.ex-card-inner {
  display: flex;
  gap: 16px;
  padding: 1.25rem;
  align-items: stretch;
}

/* Cột trái: Logo file */
.ex-card-file {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.file-icon-wrapper {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 16px;
  font-size: 2.2rem;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.ex-card:hover .file-icon-wrapper {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* Màu sắc file */
.file-icon--pdf { color: #dc2626; background: #fef2f2; border-color: rgba(220, 38, 38, 0.2); }
.file-icon--doc, .file-icon--docx { color: #2563eb; background: #eff6ff; border-color: rgba(37, 99, 235, 0.2); }
.file-icon--ppt, .file-icon--pptx { color: #ea580c; background: #fff7ed; border-color: rgba(234, 88, 12, 0.2); }
.file-icon--xls, .file-icon--xlsx { color: #059669; background: #ecfdf5; border-color: rgba(5, 150, 105, 0.2); }
.file-icon--other { color: var(--color-primary); background: rgba(var(--color-primary-rgb), 0.08); border-color: rgba(var(--color-primary-rgb), 0.15); }

/* Cột phải: Nội dung */
.ex-card-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0; /* tránh tràn */
}

/* Dòng tiêu đề + lớp */
.ex-card-header-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 0.5rem;
}

.ex-card-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-body, #1d1d1f);
  line-height: 1.45;
  margin: 0;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color 0.2s ease;
}

.ex-card:hover .ex-card-title {
  color: var(--color-primary, #4CAF50);
}

.ex-card-grade {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 8px;
  font-size: 0.72rem;
  font-weight: 700;
  white-space: nowrap;
  background: rgba(var(--color-primary-rgb, 76, 175, 80), 0.08);
  color: var(--color-primary, #4CAF50);
  flex-shrink: 0;
}

/* Tags */
.ex-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 0.75rem;
}

.ex-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.7rem;
  font-weight: 600;
}

.ex-tag--subject {
  background: rgba(var(--color-secondary-rgb, 21, 101, 192), 0.08);
  color: var(--color-secondary, #1565C0);
}
.ex-tag--bookset {
  background: rgba(var(--color-primary-rgb, 76, 175, 80), 0.08);
  color: var(--color-primary, #4CAF50);
}

/* Footer */
.ex-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.ex-footer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ex-views, .ex-downloads, .ex-updated {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted, #6e6e73);
}

.ex-views i { color: var(--color-secondary, #1565C0); }
.ex-downloads i { color: var(--color-primary, #4CAF50); }
.ex-updated i { color: var(--text-muted, #6e6e73); }

.ex-card-arrow {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(var(--color-primary-rgb, 76, 175, 80), 0.08);
  color: var(--color-primary, #4CAF50);
  font-size: 0.85rem;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
  flex-shrink: 0;
}

.ex-card:hover .ex-card-arrow {
  background: var(--color-primary, #4CAF50);
  color: #ffffff;
  transform: translateX(3px) translateZ(0);
}

/* ==========================================================================
   EXAM PAGE – APEX LIQUID GLASS (Đồng bộ toàn hệ thống)
   ========================================================================== */

/* ─── Tất cả biến đã có trong :root toàn cục ───
   --color-primary, --color-secondary, --color-primary-dark, --color-primary-light,
   --text-body, --text-muted, --bg-body, --lg-bg-glass, --lg-bg-glass-card,
   --lg-border-glass, --lg-shadow-md, --lg-shadow-lg, --lg-radius-xl, v.v.
   ========================================================================== */

/* ============================================================
   HERO – LIQUID GLASS
============================================================ */
.exam-hero {
  position: relative;
  padding: 80px 40px;
  background: linear-gradient(135deg, var(--color-primary-light, #9ACD32) 0%, var(--color-primary, #4CAF50) 50%, var(--color-secondary, #1565C0) 100%);
  overflow: hidden;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--lg-shadow-lg, 0 16px 48px rgba(31,38,135,0.18));
  transform: translateZ(0);
}
.exam-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(255,255,255,0.25) 0%, transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(254,177,57,0.15) 0%, transparent 45%);
  pointer-events: none;
}
.exam-hero::after {
  content: '';
  position: absolute;
  top: -50px;
  right: -50px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  filter: blur(40px);
  pointer-events: none;
}
.exam-hero .hero-container {
  position: relative;
  z-index: 2;
  margin: 0;
  padding: 0;
  display: inline;
}
.exam-hero .hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 40px 30px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: calc(var(--lg-radius-lg, 20px) + 4px);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: inset 0 1px 1px rgba(255,255,255,0.4);
  width: 100%;
}
.exam-hero .hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.2);
  color: #ffffff;
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  margin-bottom: 16px;
  border: 1px solid rgba(255,255,255,0.3);
}
.exam-hero .hero-badge i {
  color: #fff;
}
.exam-hero .hero-title {
  color: #ffffff;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.exam-hero .hero-subtitle {
  color: rgba(255,255,255,0.9);
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  line-height: 1.6;
  max-width: 640px;
  margin: 0 auto 1.5rem;
}
.exam-hero .hero-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}
.exam-hero .hero-stat {
  text-align: center;
}
.exam-hero .hero-stat-num {
  color: #fff;
  font-size: 1.5rem;
  font-weight: 800;
}
.exam-hero .hero-stat-label {
  color: rgba(255,255,255,0.6);
  font-size: 0.78rem;
  font-weight: 500;
}
@media (max-width: 640px) {
  .exam-hero { padding: 50px 15px; }
  .exam-hero .hero-content { padding: 24px 16px; }
  .exam-hero .hero-stats { gap: 1rem; }
}

/* ============================================================
   FILTER BAR – LIQUID GLASS
============================================================ */
.ex-filter {
  background: var(--lg-bg-glass-card, rgba(255,255,255,0.42));
  backdrop-filter: var(--lg-blur-base, blur(24px) saturate(190%));
  -webkit-backdrop-filter: var(--lg-blur-base, blur(24px) saturate(190%));
  border: var(--lg-border-glass, 1px solid rgba(255,255,255,0.65));
  border-radius: var(--lg-radius-xl, 28px);
  padding: 1.5rem 2rem;
  margin-top: -2.5rem;
  position: relative;
  z-index: 2;
  box-shadow: var(--lg-shadow-md, 0 8px 32px rgba(31,38,135,0.12));
}
.ex-filter .form-select {
  border-radius: 10px;
  border: 1.5px solid rgba(255,255,255,0.5);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.6rem 1rem;
  transition: border-color 0.2s;
  background: rgba(255,255,255,0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.ex-filter .form-select:focus {
  border-color: var(--color-primary, #4CAF50);
  box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb, 76,175,80), 0.08);
}
.ex-select-locked {
  opacity: 0.55;
  background-color: #f3f4f6 !important;
  pointer-events: none;
}
.ex-filter label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted, #515154);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 6px;
}
.ex-btn-search {
  background: var(--color-primary, #4CAF50);
  color: #ffffff;
  border: none;
  border-radius: 10px;
  padding: 0.6rem 1.5rem;
  font-weight: 600;
  font-size: 0.88rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  justify-content: center;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}
.ex-btn-search:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  background: var(--color-primary-dark, #228B22);
}

/* ============================================================
   RESULT HEADER
============================================================ */
.ex-result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 1.5rem 0 1rem;
}
.ex-result-count {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted, #515154);
}
.ex-result-count b {
  color: var(--text-body, #1a2a1a);
}

/* ============================================================
   EXAM liST
============================================================ */
.ex-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* ============================================================
   EMPTY STATE
============================================================ */
.ex-empty {
  text-align: center;
  padding: 4rem 1.5rem;
  grid-column: 1 / -1;
}
.ex-empty-icon {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: var(--lg-bg-glass-card, rgba(255,255,255,0.42));
  backdrop-filter: var(--lg-blur-base, blur(24px) saturate(190%));
  -webkit-backdrop-filter: var(--lg-blur-base, blur(24px) saturate(190%));
  border: var(--lg-border-glass, 1px solid rgba(255,255,255,0.65));
  color: var(--text-muted, #515154);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  margin: 0 auto 1rem;
}
.ex-empty-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-body, #1a2a1a);
  margin-bottom: 4px;
}
.ex-empty-desc {
  font-size: 0.85rem;
  color: var(--text-muted, #515154);
}

/* ============================================================
   PAGINATION – LIQUID GLASS
============================================================ */
.ex-pagination {
  margin-top: 2rem;
}
.ex-pagination .page-link {
  border: 1px solid rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.3);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--text-muted, #515154);
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 8px;
  margin: 0 3px;
  padding: 6px 12px;
  transition: all 0.15s ease;
}
.ex-pagination .page-link:hover {
  background: rgba(255,255,255,0.6);
  border-color: var(--color-primary, #4CAF50);
  color: var(--color-primary, #4CAF50);
}
.ex-pagination .page-item.active .page-link {
  background: var(--color-primary, #4CAF50);
  border-color: var(--color-primary, #4CAF50);
  color: #fff;
  box-shadow: 0 4px 16px rgba(var(--color-primary-rgb, 76,175,80), 0.2);
}
.ex-pagination .page-item.disabled .page-link {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ============================================================
   RESPONSIVE
============================================================ */
@media (max-width: 991.98px) {
  .ex-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 575.98px) {
  .ex-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .ex-filter {
    padding: 1rem;
    margin-top: -1.8rem;
  }
  .exam-hero {
    padding: 40px 15px;
  }
  .exam-hero .hero-content {
    padding: 20px 16px;
  }
  .exam-hero .hero-title {
    font-size: 1.4rem;
  }
}