* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #FF6B9D;
  --secondary-color: #FDB44B;
  --accent-color: #4ECDC4;
  --success-color: #95E1D3;
  --text-dark: #2C3E50;
  --text-light: #ECF0F1;
  --bg-light: #FFFFFF;
  --bg-dark: #1A1A2E;
  --bg-gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --bg-gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --bg-gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --bg-gradient-4: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  --bg-gradient-5: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--text-dark);
  background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
  min-height: 100vh;
}

.main-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  color: var(--text-dark);
  font-size: 24px;
  font-weight: 700;
  transition: var(--transition);
}

.brand-link:hover {
  transform: scale(1.05);
}

.brand-icon {
  font-size: 32px;
  animation: sparkle 2s ease-in-out infinite;
}

@keyframes sparkle {
  0%, 100% { transform: scale(1) rotate(0deg); opacity: 1; }
  50% { transform: scale(1.2) rotate(10deg); opacity: 0.8; }
}

.brand-text {
  background: var(--bg-gradient-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: var(--spacing-xs);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 3px;
  background: var(--text-dark);
  border-radius: 3px;
  transition: var(--transition);
}

.nav-menu {
  display: flex;
  gap: var(--spacing-xl);
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 500;
  font-size: 16px;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 8px;
  transition: var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition);
}

.nav-link:hover::after {
  width: 80%;
}

.nav-link:hover {
  color: var(--primary-color);
  background: rgba(255, 107, 157, 0.1);
}

.main-content {
  min-height: calc(100vh - 200px);
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  gap: var(--spacing-md);
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 107, 157, 0.2);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.hero-section {
  background: var(--bg-gradient-2);
  border-radius: 24px;
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
  color: white;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.2) 0%, transparent 70%);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-20px, -20px); }
}

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

.hero-title {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
  font-size: 20px;
  opacity: 0.9;
  line-height: 1.8;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  color: var(--text-dark);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.section-title::before {
  content: '';
  width: 4px;
  height: 40px;
  background: var(--bg-gradient-2);
  border-radius: 2px;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.video-card {
  background: white;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.video-card-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: linear-gradient(135deg, #e0e0e0 0%, #f5f5f5 100%);
}

.video-card-content {
  padding: var(--spacing-md);
}

.video-card-category {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--bg-gradient-2);
  color: white;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.video-card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-card-description {
  font-size: 14px;
  color: #666;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--spacing-md);
}

.video-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: #999;
}

.featured-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.featured-card {
  background: white;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  cursor: pointer;
}

.featured-card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.featured-card-image {
  width: 100%;
  height: 280px;
  object-fit: cover;
  background: linear-gradient(135deg, #e0e0e0 0%, #f5f5f5 100%);
}

.featured-card-content {
  padding: var(--spacing-lg);
  flex: 1;
}

.carousel-section {
  margin-bottom: var(--spacing-2xl);
  overflow: hidden;
}

.carousel-container {
  position: relative;
}

.carousel-track {
  display: flex;
  gap: var(--spacing-md);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding: var(--spacing-md) 0;
}

.carousel-track::-webkit-scrollbar {
  display: none;
}

.carousel-item {
  flex: 0 0 300px;
  scroll-snap-align: start;
}

.masonry-grid {
  column-count: 3;
  column-gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: var(--spacing-lg);
  background: white;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
}

.masonry-item:hover {
  box-shadow: var(--shadow-lg);
}

.masonry-item-image {
  width: 100%;
  height: auto;
  display: block;
  background: linear-gradient(135deg, #e0e0e0 0%, #f5f5f5 100%);
}

.masonry-item-content {
  padding: var(--spacing-md);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
}

.category-card {
  padding: var(--spacing-xl);
  border-radius: 16px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  color: white;
  font-weight: 600;
  font-size: 18px;
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.category-card:nth-child(1) { background: var(--bg-gradient-1); }
.category-card:nth-child(2) { background: var(--bg-gradient-2); }
.category-card:nth-child(3) { background: var(--bg-gradient-3); }
.category-card:nth-child(4) { background: var(--bg-gradient-4); }
.category-card:nth-child(5) { background: var(--bg-gradient-5); }
.category-card:nth-child(6) { background: var(--bg-gradient-1); }
.category-card:nth-child(7) { background: var(--bg-gradient-2); }
.category-card:nth-child(8) { background: var(--bg-gradient-3); }
.category-card:nth-child(9) { background: var(--bg-gradient-4); }

.category-card:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: var(--shadow-lg);
}

.search-container {
  margin-bottom: var(--spacing-2xl);
}

.search-box {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.search-input {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid #e0e0e0;
  border-radius: 12px;
  font-size: 16px;
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(255, 107, 157, 0.1);
}

.search-button {
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--bg-gradient-2);
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.search-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.filter-bar {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-lg);
}

.filter-button {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: 2px solid #e0e0e0;
  background: white;
  border-radius: 20px;
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}

.filter-button:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.filter-button.active {
  background: var(--bg-gradient-2);
  border-color: transparent;
  color: white;
}

.video-detail-container {
  background: white;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-2xl);
}

.video-player-wrapper {
  position: relative;
  padding-top: 56.25%;
  background: #000;
}

.video-player {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.video-detail-content {
  padding: var(--spacing-xl);
}

.video-detail-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

.video-detail-meta {
  display: flex;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  color: #666;
  font-size: 14px;
}

.video-detail-description {
  font-size: 16px;
  line-height: 1.8;
  color: #666;
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: #f8f9fa;
  border-radius: 12px;
}

.video-detail-review {
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
  border-radius: 12px;
  border-left: 4px solid var(--primary-color);
}

.video-detail-review h3 {
  font-size: 20px;
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

.video-detail-review p {
  font-size: 15px;
  line-height: 1.9;
  color: #555;
}

.info-page {
  background: white;
  border-radius: 24px;
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-md);
}

.info-page h1 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: var(--spacing-xl);
  color: var(--text-dark);
  border-bottom: 3px solid var(--primary-color);
  padding-bottom: var(--spacing-md);
}

.info-page h2 {
  font-size: 24px;
  font-weight: 600;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

.info-page p {
  font-size: 16px;
  line-height: 1.8;
  color: #666;
  margin-bottom: var(--spacing-md);
}

.info-page ul {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.info-page li {
  font-size: 16px;
  line-height: 1.8;
  color: #666;
  margin-bottom: var(--spacing-sm);
}

.info-section {
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: #f8f9fa;
  border-radius: 12px;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.contact-card {
  padding: var(--spacing-lg);
  background: white;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.contact-card h3 {
  font-size: 18px;
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
}

.main-footer {
  background: linear-gradient(135deg, #2C3E50 0%, #34495E 100%);
  color: var(--text-light);
  padding: var(--spacing-2xl) var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-container {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: white;
}

.footer-section p {
  font-size: 14px;
  line-height: 1.6;
  opacity: 0.8;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 14px;
  opacity: 0.8;
  transition: var(--transition);
}

.footer-section a:hover {
  opacity: 1;
  color: var(--primary-color);
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.footer-social a {
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  transition: var(--transition);
}

.footer-social a:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.footer-bottom {
  max-width: 1400px;
  margin: 0 auto;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: 14px;
  opacity: 0.7;
}

.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 50px;
  height: 50px;
  background: var(--bg-gradient-2);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 24px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

@media (max-width: 1024px) {
  .masonry-grid {
    column-count: 2;
  }

  .featured-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 36px;
  }
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    gap: 0;
    box-shadow: var(--shadow-md);
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
  }

  .nav-menu.active {
    max-height: 300px;
  }

  .nav-link {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 0;
  }

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

  .masonry-grid {
    column-count: 1;
  }

  .carousel-item {
    flex: 0 0 280px;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .section-title {
    font-size: 24px;
  }

  .category-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }

  .main-content {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .info-page {
    padding: var(--spacing-lg);
  }

  .info-page h1 {
    font-size: 28px;
  }
}

@media (max-width: 480px) {
  .video-grid {
    grid-template-columns: 1fr;
  }

  .category-grid {
    grid-template-columns: 1fr;
  }

  .hero-section {
    padding: var(--spacing-lg);
  }

  .search-box {
    flex-direction: column;
  }

  .back-to-top {
    width: 40px;
    height: 40px;
    font-size: 20px;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
  }
}