/* === Header 覆盖：独立页面使用完全不透明背景 === */
.page-header.scrolled {
  background-color: var(--color-primary);
}

/* === Hero === */
.videos-hero {
  padding-top: calc(var(--header-height) + var(--space-xl));
  padding-bottom: var(--space-xl);
  background-color: var(--color-bg-white);
  text-align: center;
  color: var(--color-text-primary);
}

.videos-hero-inner {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.videos-hero-subtitle {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

.videos-hero h1 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.videos-hero-desc {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
}

/* === 列表区域 === */
.videos-list-section {
  padding: var(--space-xl) 0 var(--space-xl);
  background-color: var(--color-bg-light);
  min-height: 60vh;
}

/* === 筛选栏 === */
.videos-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  justify-content: center;
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: #fff;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
}

.filter-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.filter-btn.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* === 视频网格 === */
.videos-list-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.video-card {
  background: #fff;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.video-card-thumb {
  width: 100%;
  aspect-ratio: 16 / 10;
  position: relative;
  overflow: hidden;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-card-play {
  width: 48px;
  height: 48px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-base);
}

.video-card:hover .video-card-play {
  transform: scale(1.1);
}

.video-card-play::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-left: 14px solid var(--color-primary);
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  margin-left: 3px;
}

.video-card-body {
  padding: var(--space-lg);
}

.video-card-body h3 {
  font-size: var(--text-base);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.5;
}

.video-card-summary {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* === 加载/空/错误/到底 === */
.videos-loading {
  text-align: center;
  padding: var(--space-xl) 0;
  color: var(--color-text-light);
}

.videos-empty {
  text-align: center;
  padding: var(--space-xl) 0;
  color: var(--color-text-light);
  font-size: var(--text-lg);
}

.videos-sentinel {
  height: 1px;
}

.videos-end {
  text-align: center;
  margin-top: var(--space-xl);
  color: var(--color-text-light);
  font-size: var(--text-sm);
}

/* === Modal 播放器 === */
.video-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.video-modal {
  background: #1a1a1a;
  border-radius: var(--radius-md);
  overflow: hidden;
  width: 100%;
  max-width: 900px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.4);
}

.video-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  background: #CC0000;
}

.video-modal-title {
  color: #fff;
  font-size: var(--text-base);
  font-weight: 600;
}

.video-modal-close {
  background: none;
  border: none;
  color: #999;
  font-size: 24px;
  cursor: pointer;
  line-height: 1;
  padding: 0 4px;
  transition: color var(--transition-base);
}

.video-modal-close:hover {
  color: #fff;
}

.video-modal-body {
  aspect-ratio: 16 / 9;
  background: #000;
}

.video-modal-body iframe,
.video-modal-body video {
  width: 100%;
  height: 100%;
  border: 0;
}

/* === Footer 修正 === */
.page-footer {
  height: auto;
}

/* === 响应式 === */
@media (max-width: 1000px) {
  .videos-list-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .videos-list-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .videos-hero {
    padding-top: calc(var(--header-height) + var(--space-lg));
    padding-bottom: var(--space-lg);
  }

  .video-modal {
    max-width: 100%;
    border-radius: 0;
  }
}