/* ========================================
   GOM 游戏引擎网站 - 教程中心样式
   蓝白经典主题 - 科技感升级版
   ======================================== */

/* ==========================================
   1. Hero 区域
   ========================================== */
.tutorial-hero {
  position: relative;
  padding: calc(var(--header-height) + var(--space-3xl)) 0 var(--space-3xl);
  overflow: hidden;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, #e8f0fe 50%, var(--bg-primary) 100%);
}

.tutorial-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.tutorial-hero__bg {
  display: none;
}

.tutorial-hero__grid {
  display: none;
}

.tutorial-hero__glow {
  display: none;
}

.tutorial-hero__content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.tutorial-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: #2563eb;
  margin-bottom: var(--space-xl);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.1);
}

.tutorial-hero__badge svg {
  stroke: #2563eb;
}

.tutorial-hero__title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, #1e40af 0%, #2563eb 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tutorial-hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-2xl);
}

.tutorial-hero__stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  padding: var(--space-xl);
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.08);
}

.tutorial-hero__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.tutorial-hero__stat-number {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tutorial-hero__stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.tutorial-hero__stat-divider {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, transparent, rgba(59, 130, 246, 0.2), transparent);
}

/* ==========================================
   2. 教程内容区域
   ========================================== */
.tutorial-section {
  padding: var(--space-3xl) 0;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, #e8f0fe 50%, var(--bg-secondary) 100%);
  position: relative;
}

.tutorial-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.2), transparent);
}

/* 筛选区域 */
.tutorial-filter {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.06);
}

.tutorial-filter__types {
  display: flex;
  gap: var(--space-sm);
}

.tutorial-filter__type {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: transparent;
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
}

.tutorial-filter__type:hover {
  border-color: rgba(59, 130, 246, 0.4);
  color: #2563eb;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.12);
}

.tutorial-filter__type--active {
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  border-color: transparent;
  color: var(--white);
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.35);
}

.tutorial-filter__type--active:hover {
  color: var(--white);
  transform: translateY(-2px);
}

.tutorial-filter__type svg {
  stroke: currentColor;
}

.tutorial-filter__search {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-lg);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tutorial-filter__search:focus-within {
  border-color: rgba(59, 130, 246, 0.4);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.tutorial-filter__search svg {
  stroke: #2563eb;
  flex-shrink: 0;
}

.tutorial-filter__search-input {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  width: 200px;
  outline: none;
}

.tutorial-filter__search-input::placeholder {
  color: var(--text-secondary);
}

/* 分类标签 */
.tutorial-categories {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.tutorial-category {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(10px);
  text-decoration: none;
}

.tutorial-category:hover {
  border-color: rgba(59, 130, 246, 0.4);
  color: #2563eb;
  background: rgba(255, 255, 255, 1);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.12);
}

.tutorial-category--active {
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  border-color: transparent;
  color: var(--white);
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.35);
}

.tutorial-category--active:hover {
  color: var(--white);
}

.tutorial-category svg {
  stroke: currentColor;
}

/* ==========================================
   3. 教程卡片
   ========================================== */
.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.tutorial-card {
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(59, 130, 246, 0.08);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  backdrop-filter: blur(10px);
}

.tutorial-card a {
  display: block;
  text-decoration: none;
  color: inherit;
}

.tutorial-card:hover {
  transform: translateY(-6px);
  border-color: rgba(59, 130, 246, 0.3);
  box-shadow: 0 16px 40px rgba(59, 130, 246, 0.12);
}

.tutorial-card__thumbnail {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.tutorial-card__thumbnail-bg {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #06b6d4 100%);
  transition: all 0.4s ease;
}

.tutorial-card:hover .tutorial-card__thumbnail-bg {
  transform: scale(1.05);
}

.tutorial-card__thumbnail-bg svg {
  stroke: rgba(255, 255, 255, 0.3);
}

.tutorial-card__thumbnail-bg--blue {
  background: linear-gradient(135deg, #3B82F6 0%, #1D4ED8 100%);
}

.tutorial-card__thumbnail-bg--accent {
  background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
}

.tutorial-card__thumbnail-bg--green {
  background: linear-gradient(135deg, #10B981 0%, #059669 100%);
}

.tutorial-card__thumbnail-bg--purple {
  background: linear-gradient(135deg, #8B5CF6 0%, #6D28D9 100%);
}

.tutorial-card__thumbnail-bg--dark {
  background: linear-gradient(135deg, #475569 0%, #1e293b 100%);
}

.tutorial-card__thumbnail--article {
  background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
}

.tutorial-card__play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 50%;
  color: #2563eb;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.tutorial-card:hover .tutorial-card__play {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.tutorial-card__play svg {
  margin-left: 3px;
}

.tutorial-card__duration {
  position: absolute;
  bottom: var(--space-sm);
  right: var(--space-sm);
  padding: var(--space-xs) var(--space-sm);
  background: rgba(0, 0, 0, 0.75);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--white);
  backdrop-filter: blur(4px);
}

.tutorial-card__article-count {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-secondary);
}

.tutorial-card__content {
  padding: var(--space-lg);
}

.tutorial-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.tutorial-card__type {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 2px var(--space-sm);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(59, 130, 246, 0.04) 100%);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: #2563eb;
}

.tutorial-card__type svg {
  stroke: currentColor;
}

.tutorial-card__type--article {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.12) 0%, rgba(6, 182, 212, 0.08) 100%);
  color: #0284c7;
}

.tutorial-card__category-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-sm);
  background: rgba(59, 130, 246, 0.06);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.tutorial-card__category-tag--blue {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(37, 99, 235, 0.05) 100%);
  color: #3b82f6;
}

.tutorial-card__category-tag--accent {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.12) 0%, rgba(251, 191, 36, 0.06) 100%);
  color: #f59e0b;
}

.tutorial-card__category-tag--green {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(52, 211, 153, 0.05) 100%);
  color: #10b981;
}

.tutorial-card__category-tag--purple {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(167, 139, 250, 0.05) 100%);
  color: #8b5cf6;
}

.tutorial-card__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  line-height: var(--line-height-tight);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tutorial-card__desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-md);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tutorial-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(59, 130, 246, 0.08);
}

.tutorial-card__author {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.tutorial-card__author-avatar {
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  border-radius: 50%;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: var(--white);
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.tutorial-card__info {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.tutorial-card__views {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.tutorial-card__views svg {
  stroke: currentColor;
}

/* ==========================================
   4. 分页
   ========================================== */
.tutorial-pagination {
  display: flex;
  justify-content: center;
  padding: var(--space-xl) 0;
}

/* ThinkPHP 默认分页样式 */
.tutorial-pagination a,
.tutorial-pagination span {
  min-width: 40px;
  height: 40px;
  padding: 0 var(--space-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
  background: var(--bg-secondary);
  margin: 0 4px;
}

.tutorial-pagination a:hover {
  color: var(--white);
  border-color: var(--primary);
  background: var(--primary);
}

.tutorial-pagination span.current,
.tutorial-pagination .current {
  color: var(--white);
  border-color: var(--primary);
  background: var(--primary);
}

.tutorial-pagination span.disabled,
.tutorial-pagination .disabled {
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.5;
}

.tutorial-pagination span.disabled:hover {
  background: var(--bg-secondary);
  border-color: var(--border);
  color: var(--text-muted);
}

.pagination__ellipsis {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

/* 空数据提示 */
.tutorial-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-4xl) var(--space-xl);
  color: var(--text-muted);
}

.tutorial-empty p {
  margin-top: var(--space-md);
  font-size: var(--font-size-lg);
}

/* 推荐标签 */
.tutorial-card__badge {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  padding: 4px 10px;
  background: var(--gradient-primary);
  color: var(--white);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-sm);
  z-index: 2;
}

/* 缩略图图片 */
.tutorial-card__thumbnail-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ==========================================
   5. CTA 区域
   ========================================== */
.tutorial-cta {
  padding: var(--space-4xl) 0;
  background: var(--bg-primary);
}

.tutorial-cta__content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.tutorial-cta__icon {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-xl);
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--glow-primary);
}

.tutorial-cta__icon svg {
  stroke: var(--white);
}

.tutorial-cta__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.tutorial-cta__desc {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-2xl);
}

.tutorial-cta__buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
}

/* ==========================================
   6. 响应式设计
   ========================================== */
@media (max-width: 1200px) {
  .tutorial-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 992px) {
  .tutorial-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .tutorial-filter {
    flex-direction: column;
    align-items: stretch;
  }

  .tutorial-filter__types {
    justify-content: center;
    flex-wrap: wrap;
  }

  .tutorial-filter__search {
    justify-content: center;
  }

  .tutorial-filter__search-input {
    width: 100%;
    text-align: center;
  }

  .tutorial-hero__stats {
    flex-wrap: wrap;
  }
}

@media (max-width: 768px) {
  .tutorial-hero {
    padding: calc(var(--header-height) + var(--space-2xl)) 0 var(--space-2xl);
  }

  .tutorial-hero__title {
    font-size: var(--font-size-3xl);
  }

  .tutorial-hero__subtitle {
    font-size: var(--font-size-base);
  }

  .tutorial-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .tutorial-categories {
    justify-content: center;
  }

  .tutorial-filter__types {
    flex-direction: column;
  }

  .tutorial-filter__type {
    justify-content: center;
  }

  .tutorial-cta__buttons {
    flex-direction: column;
    align-items: center;
  }

  .tutorial-cta__buttons .btn {
    width: 100%;
    max-width: 280px;
  }

  .tutorial-hero__stats {
    flex-direction: column;
    gap: var(--space-md);
  }

  .tutorial-hero__stat-divider {
    width: 60px;
    height: 1px;
  }
}

@media (max-width: 480px) {
  .tutorial-category {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-size-xs);
  }

  .tutorial-card__content {
    padding: var(--space-md);
  }

  .tutorial-card__title {
    font-size: var(--font-size-sm);
  }

  .pagination__item {
    min-width: 36px;
    height: 36px;
    font-size: var(--font-size-xs);
  }
}