/* ============================================
   Resource Library - Quizzman Mandarin
   QMF Design System (ui.quizzman.com)
   ============================================ */

:root {
  --qmf-primary: #667eea;
  --qmf-secondary: #764ba2;
  --qmf-success: #10b981;
  --qmf-error: #ef4444;
  --qmf-warning: #f59e0b;
  --qmf-bg: #f8fafc;
  --qmf-radius: 12px;
  --rl-grammar: #8B5CF6;
  --rl-vocabulary: #3B82F6;
  --rl-research: #10B981;
  --rl-articles: #F59E0B;
  --rl-text: #1e293b;
  --rl-text-secondary: #64748b;
  --rl-border: #e2e8f0;
  --rl-bg-card: #ffffff;
  --rl-bg-page: #f8fafc;
}

[data-theme="dark"] {
  --rl-text: #f1f5f9;
  --rl-text-secondary: #94a3b8;
  --rl-border: #334155;
  --rl-bg-card: #1e293b;
  --rl-bg-page: #0f172a;
}

/* ========== Hero Section ========== */
.rl-hero {
  position: relative;
  padding: 90px 0 48px;
  background: var(--rl-bg-page);
  overflow: hidden;
}

.rl-hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, 
    color-mix(in srgb, var(--qmf-primary) 8%, transparent),
    color-mix(in srgb, var(--qmf-secondary) 5%, transparent));
  z-index: 0;
}

.rl-hero-bg::before {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--qmf-primary) 10%, transparent), transparent 70%);
  top: -100px;
  right: -100px;
}

.rl-hero-bg::after {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--qmf-secondary) 8%, transparent), transparent 70%);
  bottom: -50px;
  left: -50px;
}

.rl-hero .container {
  position: relative;
  z-index: 1;
}

.rl-hero-content {
  max-width: 680px;
}

.rl-breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 20px;
  font-size: 0.85rem;
}

.rl-breadcrumb a {
  color: var(--rl-text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.rl-breadcrumb a:hover {
  color: var(--qmf-primary);
}

.rl-breadcrumb svg {
  color: var(--rl-text-secondary);
  opacity: 0.5;
}

.rl-breadcrumb span {
  color: var(--rl-text);
  font-weight: 500;
}

.rl-hero-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--rl-text);
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  line-height: 1.2;
}

.rl-hero-icon {
  width: 40px;
  height: 40px;
  color: var(--qmf-primary);
  flex-shrink: 0;
}

.rl-hero-desc {
  font-size: 1.05rem;
  color: var(--rl-text-secondary);
  line-height: 1.7;
  margin: 0 0 28px;
}

.rl-hero-stats {
  display: flex;
  gap: 32px;
}

.rl-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.rl-stat-num {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--qmf-primary);
  font-family: 'ZCOOL XiaoWei', serif;
  line-height: 1;
}

.rl-stat-label {
  font-size: 0.8rem;
  color: var(--rl-text-secondary);
  margin-top: 4px;
  font-weight: 500;
}

/* ========== Main Content ========== */
.rl-main {
  padding: 40px 0 80px;
  background: var(--rl-bg-page);
  min-height: 60vh;
}

/* ========== Toolbar ========== */
.rl-toolbar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
}

.rl-search {
  flex: 1;
  position: relative;
  max-width: 480px;
}

.rl-search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--rl-text-secondary);
  pointer-events: none;
}

.rl-search-input {
  width: 100%;
  padding: 12px 16px 12px 44px;
  border: 1.5px solid var(--rl-border);
  border-radius: var(--qmf-radius);
  background: var(--rl-bg-card);
  color: var(--rl-text);
  font-size: 0.95rem;
  transition: all 0.2s;
  outline: none;
}

.rl-search-input:focus {
  border-color: var(--qmf-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--qmf-primary) 15%, transparent);
}

.rl-search-input::placeholder {
  color: var(--rl-text-secondary);
}

.rl-view-toggle {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--rl-bg-card);
  border: 1px solid var(--rl-border);
  border-radius: 10px;
}

.rl-view-btn {
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  color: var(--rl-text-secondary);
}

.rl-view-btn svg {
  width: 18px;
  height: 18px;
}

.rl-view-btn.active {
  background: var(--qmf-primary);
  color: white;
}

.rl-view-btn:not(.active):hover {
  background: color-mix(in srgb, var(--qmf-primary) 10%, transparent);
  color: var(--qmf-primary);
}

/* ========== Section Header ========== */
.rl-section-header {
  margin-bottom: 28px;
}

.rl-section-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--rl-text);
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
}

.rl-section-icon {
  width: 24px;
  height: 24px;
  color: var(--qmf-primary);
}

/* ========== Folders Grid ========== */
.rl-folders-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* ========== Detail View ========== */
.rl-detail-view {
  animation: rlFadeIn 0.3s ease-out;
}

.rl-detail-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--rl-border);
}

.rl-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1.5px solid var(--rl-border);
  border-radius: var(--qmf-radius);
  background: var(--rl-bg-card);
  color: var(--rl-text);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.rl-back-btn svg {
  width: 18px;
  height: 18px;
}

.rl-back-btn:hover {
  border-color: var(--qmf-primary);
  color: var(--qmf-primary);
  background: color-mix(in srgb, var(--qmf-primary) 5%, var(--rl-bg-card));
}

.rl-detail-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--rl-text);
  margin: 0;
}

.rl-detail-count {
  font-size: 0.85rem;
  color: var(--rl-text-secondary);
  background: color-mix(in srgb, var(--qmf-primary) 10%, transparent);
  padding: 4px 12px;
  border-radius: 20px;
  font-weight: 500;
}

/* ========== Resource Items Grid ========== */
.rl-resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.rl-resource-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: var(--rl-bg-card);
  border: 1px solid var(--rl-border);
  border-radius: var(--qmf-radius);
  cursor: pointer;
  transition: all 0.25s;
  text-decoration: none;
  color: inherit;
}

.rl-resource-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 24px -8px rgba(0,0,0,0.1);
  border-color: var(--qmf-primary);
}

.rl-resource-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.rl-resource-icon svg {
  width: 24px;
  height: 24px;
  color: white;
}

.rl-resource-icon.grammar { background: linear-gradient(135deg, var(--rl-grammar), #a78bfa); }
.rl-resource-icon.vocabulary { background: linear-gradient(135deg, var(--rl-vocabulary), #60a5fa); }
.rl-resource-icon.research { background: linear-gradient(135deg, var(--rl-research), #34d399); }
.rl-resource-icon.articles { background: linear-gradient(135deg, var(--rl-articles), #fbbf24); }

.rl-resource-info {
  flex: 1;
  min-width: 0;
}

.rl-resource-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--rl-text);
  margin: 0 0 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rl-resource-desc {
  font-size: 0.825rem;
  color: var(--rl-text-secondary);
  line-height: 1.5;
  margin: 0 0 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.rl-resource-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.75rem;
  color: var(--rl-text-secondary);
}

.rl-resource-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.rl-resource-meta svg {
  width: 13px;
  height: 13px;
}

.rl-resource-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 600;
}

.rl-resource-badge.gdrive {
  background: color-mix(in srgb, #4285F4 15%, transparent);
  color: #4285F4;
}

.rl-resource-badge.article {
  background: color-mix(in srgb, var(--qmf-secondary) 15%, transparent);
  color: var(--qmf-secondary);
}

/* ========== Empty State ========== */
.rl-empty-state {
  text-align: center;
  padding: 60px 20px;
}

.rl-empty-icon {
  width: 64px;
  height: 64px;
  color: var(--rl-text-secondary);
  opacity: 0.4;
  margin-bottom: 20px;
}

.rl-empty-state h3 {
  font-size: 1.2rem;
  color: var(--rl-text);
  margin: 0 0 8px;
}

.rl-empty-state p {
  color: var(--rl-text-secondary);
  font-size: 0.95rem;
}

/* ========== Pagination ========== */
.rl-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}

.rl-page-btn {
  width: 40px;
  height: 40px;
  border: 1px solid var(--rl-border);
  border-radius: 10px;
  background: var(--rl-bg-card);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  color: var(--rl-text);
}

.rl-page-btn svg {
  width: 18px;
  height: 18px;
}

.rl-page-btn:hover:not(:disabled) {
  border-color: var(--qmf-primary);
  color: var(--qmf-primary);
}

.rl-page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.rl-page-numbers {
  display: flex;
  gap: 4px;
}

.rl-page-num {
  width: 40px;
  height: 40px;
  border: 1px solid var(--rl-border);
  border-radius: 10px;
  background: var(--rl-bg-card);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--rl-text);
  transition: all 0.2s;
}

.rl-page-num.active {
  background: var(--qmf-primary);
  color: white;
  border-color: var(--qmf-primary);
}

.rl-page-num:hover:not(.active) {
  border-color: var(--qmf-primary);
  color: var(--qmf-primary);
}

/* ========== Recent Section ========== */
.rl-recent {
  margin-top: 64px;
}

.rl-recent-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

/* ========== List View ========== */
.rl-folders-grid.list-view {
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.rl-resources-grid.list-view {
  grid-template-columns: 1fr;
  gap: 12px;
}

.rl-resources-grid.list-view .rl-resource-item {
  flex-direction: row;
}

/* ========== Animations ========== */
@keyframes rlFadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ========== Hidden utility ========== */
.hidden {
  display: none !important;
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .rl-folders-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .rl-hero {
    padding: 100px 0 32px;
  }

  .rl-hero-stats {
    gap: 20px;
  }

  .rl-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .rl-search {
    max-width: none;
  }

  .rl-view-toggle {
    align-self: flex-end;
  }

  .rl-folders-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .rl-folders-grid.list-view {
    grid-template-columns: 1fr;
  }

  .rl-resources-grid {
    grid-template-columns: 1fr;
  }

  .rl-detail-header {
    flex-wrap: wrap;
  }
}

@media (max-width: 480px) {
  .rl-hero-title {
    font-size: 1.6rem;
  }

  .rl-folders-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .rl-resource-item {
    padding: 14px;
  }
}

/* ========== Catalog List (Grammar) ========== */
.rl-catalog-group {
  margin-bottom: 28px;
}
.rl-catalog-group-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--rl-text);
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--rl-border);
}
.rl-catalog-group-title i { color: var(--rl-grammar); font-size: 0.9rem; }
.rl-catalog-group-count {
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--rl-border);
  color: var(--rl-text-secondary);
  padding: 2px 10px;
  border-radius: 12px;
  margin-left: auto;
}
.rl-catalog-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.rl-catalog-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--rl-bg-card);
  border: 1px solid var(--rl-border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--rl-text);
  transition: all 0.2s ease;
}
.rl-catalog-item:hover {
  border-color: var(--rl-grammar);
  box-shadow: 0 4px 16px -4px color-mix(in srgb, var(--rl-grammar) 20%, transparent);
  transform: translateX(4px);
}
.rl-catalog-icon {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 10px;
  font-size: 1rem;
  flex-shrink: 0;
}
.rl-catalog-icon.grammar { background: color-mix(in srgb, var(--rl-grammar) 12%, transparent); color: var(--rl-grammar); }
.rl-catalog-icon.vocabulary { background: color-mix(in srgb, var(--rl-vocabulary) 12%, transparent); color: var(--rl-vocabulary); }
.rl-catalog-info { flex: 1; min-width: 0; }
.rl-catalog-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--rl-text);
  margin: 0;
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.rl-catalog-subtitle {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--rl-text-secondary);
  margin-top: 2px;
}
.rl-catalog-badges {
  display: flex;
  gap: 6px;
  align-items: center;
  flex-shrink: 0;
}
.rl-badge-new {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 6px;
  background: #10b981;
  color: white;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.rl-badge-free {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 6px;
  background: color-mix(in srgb, var(--rl-vocabulary) 12%, transparent);
  color: var(--rl-vocabulary);
}
.rl-badge-premium {
  font-size: 0.75rem;
  color: var(--rl-text-secondary);
  opacity: 0.5;
}
.rl-catalog-arrow {
  width: 18px; height: 18px;
  color: var(--rl-text-secondary);
  flex-shrink: 0;
  opacity: 0.4;
  transition: all 0.2s;
}
.rl-catalog-item:hover .rl-catalog-arrow { opacity: 1; color: var(--rl-grammar); transform: translateX(2px); }

/* ========== Vocabulary Cards ========== */
.rl-vocab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 16px;
}
.rl-vocab-card {
  display: flex;
  flex-direction: column;
  padding: 20px;
  background: var(--rl-bg-card);
  border: 1px solid var(--rl-border);
  border-radius: 14px;
  text-decoration: none;
  color: var(--rl-text);
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}
.rl-vocab-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--level-color, var(--rl-vocabulary));
}
.rl-vocab-card:hover {
  border-color: var(--level-color, var(--rl-vocabulary));
  box-shadow: 0 8px 24px -8px color-mix(in srgb, var(--level-color, #3B82F6) 25%, transparent);
  transform: translateY(-4px);
}
.rl-vocab-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}
.rl-vocab-level {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 6px;
  color: white;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.rl-vocab-count {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--rl-text-secondary);
}
.rl-vocab-card-title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--rl-text);
}
.rl-vocab-preview {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.rl-vocab-preview-word {
  font-size: 0.85rem;
  padding: 3px 10px;
  background: var(--rl-bg-page);
  border-radius: 6px;
  color: var(--rl-text-secondary);
  font-family: 'Noto Sans SC', sans-serif;
}
.rl-vocab-card-action {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--level-color, var(--rl-vocabulary));
  margin-top: auto;
}
.rl-vocab-card:hover .rl-vocab-card-action svg { transform: translateX(4px); }
.rl-vocab-card-action svg { transition: transform 0.2s; }

/* ========== Quiz Placeholder ========== */
.rl-quiz-placeholder {
  text-align: center;
  padding: 60px 20px;
}
.rl-quiz-placeholder-icon {
  width: 80px; height: 80px;
  margin: 0 auto 20px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 20px;
  background: linear-gradient(135deg, #EC4899 0%, #8B5CF6 100%);
  font-size: 2rem;
  color: white;
}
.rl-quiz-placeholder h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--rl-text);
  margin: 0 0 10px;
}
.rl-quiz-placeholder p {
  font-size: 0.95rem;
  color: var(--rl-text-secondary);
  max-width: 500px;
  margin: 0 auto 28px;
  line-height: 1.6;
}
.rl-quiz-features {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}
.rl-quiz-feature {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--rl-text);
}
.rl-quiz-feature i { color: #EC4899; }

/* ========== Loading placeholder ========== */
.rl-loading-placeholder {
  text-align: center;
  padding: 48px;
  color: var(--rl-text-secondary);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .rl-vocab-grid { grid-template-columns: 1fr; }
  .rl-catalog-item { padding: 12px 14px; }
  .rl-catalog-title { white-space: normal; }
  .rl-quiz-features { flex-direction: column; align-items: center; }
}