:root {
      --bg-color: #121212;
      --text-main: #f5f5f5;
      --text-muted: #a0a0a0;
      --primary: #ff7a00;
      --primary-hover: #ff9838;
      --card-bg: #1e1e1e;
      --border-color: #333;
      --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    }

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

    body {
      font-family: var(--font-main);
      background-color: var(--bg-color);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: var(--primary);
      text-decoration: none;
    }

    a:hover {
      text-decoration: underline;
    }

    img {
      max-width: 100%;
      display: block;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      background-color: rgba(18, 18, 18, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      z-index: 100;
      padding: 12px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .logo-area img {
      height: 32px;
      width: auto;
    }

    .logo-area span {
      font-size: 1.2rem;
      font-weight: bold;
      color: var(--text-main);
    }

    .main-nav {
      display: none;
      gap: 20px;
      font-size: 0.95rem;
    }

    .main-nav a {
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s;
    }

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

    /* 首屏 Hero */
    .hero-section {
      padding: 60px 20px;
      text-align: center;
      background: radial-gradient(circle at top center, rgba(255, 122, 0, 0.15) 0%, var(--bg-color) 60%);
    }

    .hero-section h1 {
      font-size: 2rem;
      line-height: 1.3;
      margin-bottom: 20px;
      color: var(--text-main);
      font-weight: 800;
    }

    .hero-section p {
      font-size: 1.1rem;
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto 30px;
    }

    .download-btn {
      display: inline-block;
      background-color: var(--primary);
      color: #fff;
      font-size: 1.1rem;
      font-weight: bold;
      padding: 12px 30px;
      border-radius: 30px;
      text-decoration: none;
      transition: background 0.3s, transform 0.2s;
    }

    .download-btn:hover {
      background-color: var(--primary-hover);
      transform: scale(1.05);
      text-decoration: none;
    }

    /* 通用区块 */
    .section {
      padding: 50px 20px;
      max-width: 1200px;
      margin: 0 auto;
    }

    .section-title {
      font-size: 1.6rem;
      margin-bottom: 10px;
      text-align: center;
    }

    .section-subtitle {
      text-align: center;
      color: var(--text-muted);
      margin-bottom: 30px;
      font-size: 0.95rem;
    }

    /* 题材导览 */
    .genre-grid {
      display: grid;
      grid-template-columns: repeat(1, 1fr);
      gap: 20px;
    }

    .genre-card {
      background-color: var(--card-bg);
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      transition: transform 0.2s;
    }

    .genre-card:hover {
      transform: translateY(-5px);
    }

    .genre-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }

    .genre-info {
      padding: 15px;
    }

    .genre-info h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }

    .genre-info p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* TOP榜单 */
    .top-list {
      display: flex;
      flex-direction: column;
      gap: 15px;
    }

    .top-item {
      display: flex;
      gap: 15px;
      background-color: var(--card-bg);
      padding: 10px;
      border-radius: 10px;
      align-items: center;
      border: 1px solid var(--border-color);
    }

    .top-item img {
      width: 60px;
      height: 80px;
      object-fit: cover;
      border-radius: 6px;
    }

    .top-rank {
      font-size: 1.5rem;
      font-weight: bold;
      color: var(--primary);
      width: 30px;
      text-align: center;
    }

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

    .top-info p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 社区问答 */
    .qa-list {
      display: flex;
      flex-direction: column;
      gap: 15px;
    }

    .qa-item {
      background-color: var(--card-bg);
      padding: 15px;
      border-radius: 10px;
      border: 1px solid var(--border-color);
    }

    .qa-item .q {
      font-weight: bold;
      color: var(--primary);
      margin-bottom: 8px;
      font-size: 1rem;
    }

    .qa-item .a {
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    /* 权威认证 */
    .cert-section {
      text-align: center;
      background: #181818;
      border-radius: 12px;
      padding: 40px 20px;
      border: 1px solid var(--border-color);
    }

    .cert-section h2 {
      margin-bottom: 15px;
    }

    .cert-section p {
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto;
    }

    /* 图片墙 */
    .gallery-scroll {
      display: flex;
      overflow-x: auto;
      gap: 15px;
      padding-bottom: 10px;
      scroll-snap-type: x mandatory;
    }

    .gallery-scroll::-webkit-scrollbar {
      display: none;
    }

    .gallery-item {
      flex: 0 0 160px;
      scroll-snap-align: start;
      border-radius: 10px;
      overflow: hidden;
    }

    .gallery-item img {
      width: 100%;
      height: 240px;
      object-fit: cover;
    }

    /* 播放功能说明 */
    .features-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 20px;
    }

    .feature-box {
      background-color: var(--card-bg);
      padding: 20px;
      border-radius: 10px;
      border: 1px solid var(--border-color);
    }

    .feature-box h3 {
      margin-bottom: 10px;
      font-size: 1.1rem;
      color: var(--primary);
    }

    .feature-box p {
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    /* 页脚 */
    .site-footer {
      background-color: #0a0a0a;
      padding: 30px 20px;
      text-align: center;
      font-size: 0.8rem;
      color: #666;
      border-top: 1px solid #222;
    }

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

    .site-footer a {
      color: #666;
      text-decoration: none;
    }

    .site-footer a:hover {
      text-decoration: underline;
    }

    /* 响应式 */
    @media (min-width: 768px) {
      .main-nav {
        display: flex;
      }
      .hero-section h1 {
        font-size: 2.8rem;
      }
      .genre-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .gallery-item {
        flex: 0 0 220px;
      }
      .gallery-item img {
        height: 320px;
      }
    }

    @media (min-width: 1024px) {
      .genre-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .features-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .top-list {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
      }
      .qa-list {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
      }
    }