:root {
    --bg-color: #0f1015;
    --surface-color: #1a1c23;
    --primary-color: #ff4d4f;
    --primary-hover: #ff7875;
    --text-main: #f0f0f0;
    --text-muted: #a0a0a0;
    --border-color: #2c2f3a;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
  }

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

  body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }

  a {
    color: inherit;
    text-decoration: none;
  }

  img {
    max-width: 100%;
    display: block;
    object-fit: cover;
    background-color: var(--surface-color);
  }

  /* 顶部导航 */
  .site-header {
    position: sticky;
    top: 0;
    background-color: rgba(15, 16, 21, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
  }

  .header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.5px;
  }

  .brand img {
    height: 32px;
    width: auto;
    border-radius: var(--radius-sm);
  }

  .nav-links {
    display: none;
    gap: 24px;
  }

  .nav-links a {
    color: var(--text-muted);
    font-size: 0.95rem;
    transition: color 0.2s;
  }

  .nav-links a:hover {
    color: var(--text-main);
  }

  .header-cta {
    background-color: var(--primary-color);
    color: #fff;
    padding: 8px 18px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: background-color 0.2s;
  }

  .header-cta:hover {
    background-color: var(--primary-hover);
  }

  /* 首屏 Hero */
  .hero-section {
    padding: 60px 20px;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 40px;
  }

  .hero-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 20px;
  }

  .hero-content h1 {
    font-size: 2.5rem;
    line-height: 1.2;
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .hero-content p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 500px;
  }

  .hero-actions {
    display: flex;
    gap: 16px;
    margin-top: 10px;
  }

  .btn-primary {
    background-color: var(--primary-color);
    color: #fff;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    transition: transform 0.2s, background-color 0.2s;
    display: inline-block;
  }

  .btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
  }

  .hero-visual {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
  }

  .hero-visual img {
    width: 100%;
    height: 100%;
    min-height: 300px;
    object-fit: cover;
    aspect-ratio: 16/9;
  }

  /* 通用区块设置 */
  .section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 20px;
  }

  .section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 30px;
  }

  .section-header h2 {
    font-size: 1.8rem;
    font-weight: 700;
  }

  .section-header .subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 6px;
    display: block;
  }

  /* 卡片网格：最新上架 & 观看最多 */
  .card-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .card {
    background-color: var(--surface-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: transform 0.2s;
    border: 1px solid var(--border-color);
  }

  .card:hover {
    transform: translateY(-4px);
  }

  .card-img-wrapper {
    position: relative;
    aspect-ratio: 3/4;
  }

  .card-img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .card-info {
    padding: 12px;
  }

  .card-info h3 {
    font-size: 1rem;
    margin-bottom: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .card-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
  }

  /* 题材导览 (横向滚动) */
  .scroll-row {
    display: flex;
    overflow-x: auto;
    gap: 16px;
    padding-bottom: 16px;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
  }
  
  .scroll-row::-webkit-scrollbar {
    display: none;
  }

  .scroll-item {
    flex: 0 0 240px;
    scroll-snap-align: start;
    border-radius: var(--radius-md);
    overflow: hidden;
    background-color: var(--surface-color);
  }

  .scroll-item img {
    width: 100%;
    aspect-ratio: 3/4;
    object-fit: cover;
  }

  .scroll-item-info {
    padding: 12px;
  }

  .scroll-item-info h3 {
    font-size: 1rem;
    margin-bottom: 4px;
  }

  .scroll-item-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
  }

  /* 权威认证 & 功能说明 */
  .feature-block {
    background-color: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: 40px 20px;
    border: 1px solid var(--border-color);
  }

  .feature-grid {
    display: grid;
    gap: 30px;
  }

  .feature-text h2 {
    font-size: 1.8rem;
    margin-bottom: 16px;
  }

  .feature-text p {
    color: var(--text-muted);
    margin-bottom: 16px;
  }

  .feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.95rem;
  }

  .feature-list li::before {
    content: "✓";
    color: var(--primary-color);
    font-weight: bold;
  }

  .feature-image img {
    width: 100%;
    border-radius: var(--radius-md);
    aspect-ratio: 4/3;
    object-fit: cover;
  }

  /* 图文交错区块 */
  .alternating-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 20px;
    display: flex;
    flex-direction: column;
    gap: 40px;
  }

  .alt-row {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
  }

  .alt-img {
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
  }

  .alt-img img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
  }

  .alt-text h2 {
    font-size: 1.6rem;
    margin-bottom: 12px;
  }

  .alt-text p {
    color: var(--text-muted);
    font-size: 1rem;
  }

  /* 底部下载提示 */
  .bottom-cta {
    text-align: center;
    padding: 60px 20px;
    background: linear-gradient(180deg, var(--bg-color) 0%, #1a1c23 100%);
  }

  .bottom-cta h2 {
    font-size: 2rem;
    margin-bottom: 16px;
  }

  .bottom-cta p {
    color: var(--text-muted);
    margin-bottom: 30px;
  }

  /* 页脚 */
  .site-footer {
    border-top: 1px solid var(--border-color);
    padding: 30px 20px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
  }

  .site-footer p {
    margin-bottom: 8px;
  }

  .site-footer a {
    color: var(--text-muted);
    transition: color 0.2s;
  }

  .site-footer a:hover {
    color: var(--text-main);
  }

  /* 响应式断点 */
  @media (min-width: 768px) {
    .nav-links {
      display: flex;
    }
    .hero-section {
      flex-direction: row;
      align-items: center;
      padding: 80px 40px;
    }
    .hero-content {
      flex: 1;
      padding-right: 40px;
    }
    .hero-visual {
      flex: 1;
    }
    .hero-visual img {
      aspect-ratio: 4/5;
    }
    .card-grid {
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .feature-grid {
      grid-template-columns: 1fr 1fr;
      align-items: center;
    }
    .alternating-section {
      padding: 80px 40px;
    }
    .alt-row {
      flex-direction: row;
      gap: 40px;
    }
    .alt-row:nth-child(even) {
      flex-direction: row-reverse;
    }
    .alt-img, .alt-text {
      flex: 1;
    }
    .alt-img img {
      aspect-ratio: 4/3;
    }
    .section-container {
      padding: 80px 40px;
    }
  }

  @media (min-width: 1024px) {
    .hero-content h1 {
      font-size: 3.5rem;
    }
    .card-grid {
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .scroll-item {
      flex: 0 0 280px;
    }
  }