:root {
  --bg-color: #0a0a0a;
  --surface-color: #121212;
  --surface-hover: #1a1a1a;
  --primary-color: #ff2a5f;
  --primary-hover: #ff5e85;
  --accent-color: #00f2ff;
  --text-main: #ffffff;
  --text-muted: #aaaaaa;
  --glass-bg: rgba(15, 15, 20, 0.95);
  --glass-border: rgba(255, 42, 95, 0.15);
  --border-radius: 16px;
  --transition-speed: 0.3s;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', -apple-system, sans-serif;
}

body {
  background-color: var(--bg-color);
  background-image: 
    radial-gradient(circle at 20% 30%, rgba(255, 42, 95, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(0, 242, 255, 0.06) 0%, transparent 50%);
  color: var(--text-main);
  line-height: 1.6;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 3rem;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--glass-border);
}

.logo {
  font-size: 1.75rem;
  font-weight: 900;
  letter-spacing: -1px;
  text-transform: uppercase;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
  color: white;
}

.logo span {
  background: linear-gradient(90deg, #ff2a5f, #ff00aa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.search-bar {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
}

.search-bar input {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  padding: 0.85rem 1.2rem 0.85rem 2.8rem;
  border-radius: 12px;
  color: white;
  width: 320px;
  font-size: 1rem;
  transition: all 0.3s;
}

.search-bar input:focus {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(255, 42, 95, 0.2);
  outline: none;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 2rem;
}

.category-filters {
  display: flex;
  gap: 0.8rem;
  overflow-x: auto;
  padding-bottom: 1.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.chip {
  padding: 0.65rem 1.6rem;
  border-radius: 9999px;
  background: var(--surface-color);
  border: 1px solid var(--glass-border);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-speed);
}

.chip.active, .chip:hover {
  background: var(--primary-color);
  color: #000;
  border-color: var(--primary-color);
  transform: translateY(-2px);
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
}

.video-card {
  background: var(--surface-color);
  border-radius: var(--border-radius);
  border: 1px solid var(--glass-border);
  text-decoration: none;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}

.video-card:hover {
  transform: translateY(-12px) scale(1.03);
  border-color: var(--primary-color);
  box-shadow: 0 30px 60px rgba(255, 42, 95, 0.15);
}

.thumbnail-wrapper {
  position: relative;
  aspect-ratio: 16/9;
}

.thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}

.video-card:hover .thumbnail {
  transform: scale(1.08);
}

.play-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: 0.3s;
}

.video-card:hover .play-overlay {
  opacity: 1;
}

.play-icon {
  background: rgba(255,255,255,0.95);
  color: #000;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.video-info {
  padding: 1.25rem;
}

.video-title {
  font-size: 0.98rem;
  font-weight: 500;
  line-height: 1.35;
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tag-badge {
  display: inline-block;
  background: rgba(255, 42, 95, 0.15);
  color: var(--primary-color);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.7rem;
  font-weight: 600;
}

.pagination {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 3.5rem;
  padding-bottom: 3rem;
}

.page-btn {
  padding: 0.7rem 1.4rem;
  border-radius: 12px;
  background: var(--surface-color);
  border: 1px solid var(--glass-border);
  color: var(--text-main);
  cursor: pointer;
  transition: 0.3s;
}

.page-btn.active {
  background: var(--primary-color);
  color: #000;
  border-color: var(--primary-color);
  font-weight: 700;
}

.no-results {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

/* 响应式 */
@media (max-width: 768px) {
  .navbar { padding: 1rem; flex-direction: column; gap: 1rem; }
  .search-bar input { width: 100%; }
  .container { padding: 1rem; }
}