:root {
    --bg-color: #f2f4f8;
    --text-main: #101418;
    --text-muted: #5b6577;
    --primary: #2f6bff;
    --primary-dark: #1a4bcc;
    --card-bg: #ffffff;
    --radius-lg: 24px;
    --radius-md: 16px;
    --shadow: 0 8px 30px rgba(16, 20, 24, 0.06);
  }

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

  html {
    scroll-behavior: smooth;
  }

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

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

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

  /* 导航栏 */
  .site-header {
    position: sticky;
    top: 0;
    width: 100%;
    background-color: rgba(242, 244, 248, 0.95);
    backdrop-filter: blur(12px);
    z-index: 100;
    border-bottom: 1px solid rgba(16, 20, 24, 0.05);
  }

  .nav-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 16px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    font-size: 24px;
    letter-spacing: 1px;
  }

  .brand img {
    height: 36px;
    width: auto;
    border-radius: 8px;
  }

  .nav-links {
    display: flex;
    gap: 32px;
    align-items: center;
  }

  .nav-links a {
    font-weight: 600;
    font-size: 16px;
    color: var(--text-muted);
    transition: color 0.3s;
    scroll-margin-top: 80px;
  }

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

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 100px;
    font-weight: 700;
    font-size: 16px;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
  }

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

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

  .btn-outline {
    background-color: transparent;
    color: var(--text-main);
    border: 2px solid var(--text-main);
  }

  .btn-outline:hover {
    background-color: var(--text-main);
    color: #fff;
  }

  .menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
    cursor: pointer;
  }

  /* 首屏 */
  .hero {
    max-width: 1440px;
    margin: 20px auto;
    padding: 0 40px;
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    background-color: var(--text-main);
  }

  .hero-img {
    width: 100%;
    aspect-ratio: 21 / 9;
    object-fit: cover;
    display: block;
    opacity: 0.9;
  }

  .hero-content {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(16, 20, 24, 0.95) 0%, rgba(16, 20, 24, 0.8) 40%, transparent 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 8%;
    color: #fff;
  }

  .hero-kicker {
    display: inline-block;
    background: rgba(47, 107, 255, 0.2);
    color: #8da9ff;
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 24px;
    align-self: flex-start;
    border: 1px solid rgba(47, 107, 255, 0.4);
  }

  .hero h1 {
    font-size: 56px;
    line-height: 1.2;
    margin-bottom: 24px;
    font-weight: 800;
    max-width: 600px;
  }

  .hero p {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.7);
    max-width: 500px;
    margin-bottom: 40px;
  }

  .hero-actions {
    display: flex;
    gap: 20px;
  }

  .hero-actions .btn-outline {
    color: #fff;
    border-color: #fff;
  }

  .hero-actions .btn-outline:hover {
    background-color: #fff;
    color: var(--text-main);
  }

  /* 通用区块 */
  .section {
    max-width: 1440px;
    margin: 100px auto;
    padding: 0 40px;
    scroll-margin-top: 80px;
  }

  .section-header {
    margin-bottom: 48px;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
  }

  .section-title {
    font-size: 40px;
    font-weight: 800;
    letter-spacing: -0.5px;
  }

  .section-desc {
    font-size: 18px;
    color: var(--text-muted);
    margin-top: 12px;
    max-width: 600px;
  }

  /* 四个频道 */
  .channels-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
  }

  .channel-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 4 / 3;
    box-shadow: var(--shadow);
    background-color: #e0e4ed;
  }

  .channel-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
  }

  .channel-card:hover img {
    transform: scale(1.05);
  }

  .badge {
    position: absolute;
    top: 20px;
    left: 20px;
    background-color: var(--primary);
    color: #fff;
    padding: 6px 16px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 800;
    letter-spacing: 1px;
  }

  .badge.green { background-color: #10b981; }
  .badge.orange { background-color: #f59e0b; }
  .badge.purple { background-color: #8b5cf6; }

  .channel-info {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 40px 20px 20px;
    background: linear-gradient(to top, rgba(16, 20, 24, 0.9), transparent);
    color: #fff;
    font-size: 24px;
    font-weight: 800;
  }

  /* 今晚推荐 */
  .recommend-scroll {
    display: flex;
    gap: 24px;
    overflow-x: auto;
    padding-bottom: 24px;
    scrollbar-width: none;
  }
  
  .recommend-scroll::-webkit-scrollbar {
    display: none;
  }

  .poster-card {
    flex: 0 0 240px;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow);
    background-color: #e0e4ed;
    aspect-ratio: 2 / 3;
    cursor: pointer;
    transition: transform 0.3s;
  }

  .poster-card:hover {
    transform: translateY(-8px);
  }

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

  /* 遥控器焦点 */
  .remote-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
  }

  .remote-card {
    display: flex;
    align-items: center;
    gap: 24px;
    background-color: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    transition: all 0.3s;
    border: 3px solid transparent;
  }

  .remote-card:first-child {
    border-color: var(--primary);
    box-shadow: 0 8px 30px rgba(47, 107, 255, 0.15);
  }

  .remote-card:focus {
    outline: none;
    border-color: var(--primary);
  }

  .remote-thumb {
    width: 60px;
    height: 84px;
    border-radius: 8px;
    object-fit: cover;
    background-color: #e0e4ed;
    flex-shrink: 0;
  }

  .remote-text h3 {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 8px;
  }

  .remote-text p {
    font-size: 16px;
    color: var(--text-muted);
  }

  /* 使用指南 */
  .guide-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
  }

  .guide-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    background-color: #ff7f50;
    aspect-ratio: 4 / 3;
  }

  .guide-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .steps-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
  }

  .step-item {
    display: flex;
    gap: 20px;
    background-color: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
  }

  .step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary);
    color: #fff;
    font-weight: 800;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .step-content h3 {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 8px;
  }

  .step-content p {
    font-size: 16px;
    color: var(--text-muted);
  }

  /* 常见问题 */
  .faq-groups {
    display: flex;
    flex-direction: column;
    gap: 48px;
  }

  .faq-group-title {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid rgba(16, 20, 24, 0.08);
  }

  .faq-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .faq-card {
    background-color: var(--card-bg);
    padding: 32px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    display: flex;
    gap: 24px;
  }

  .faq-card img {
    width: 100px;
    height: 100px;
    border-radius: 12px;
    object-fit: cover;
    flex-shrink: 0;
  }

  .faq-content h3 {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 12px;
  }

  .faq-content p {
    font-size: 16px;
    color: var(--text-muted);
  }

  /* 下载横条 */
  .download-banner {
    background-color: var(--text-main);
    border-radius: var(--radius-lg);
    padding: 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #fff;
    margin-top: 100px;
    max-width: 1440px;
    margin-left: auto;
    margin-right: auto;
    scroll-margin-top: 80px;
  }

  .download-text h2 {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 16px;
  }

  .download-text p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
  }

  /* 页脚 */
  .site-footer {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
    font-size: 14px;
    border-top: 1px solid rgba(16, 20, 24, 0.05);
    margin-top: 60px;
  }

  .site-footer p {
    margin-bottom: 12px;
  }

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

  /* 响应式 */
  @media (max-width: 1024px) {
    .channels-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .remote-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .hero h1 { font-size: 44px; }
    .guide-layout { grid-template-columns: 1fr; }
    .download-banner { flex-direction: column; text-align: center; gap: 32px; }
    .faq-list { grid-template-columns: 1fr; }
  }

  @media (max-width: 900px) {
    .nav-links {
      display: none;
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      background-color: var(--card-bg);
      flex-direction: column;
      padding: 24px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.1);
      gap: 20px;
    }
    .nav-links.active {
      display: flex;
    }
    .menu-toggle { display: block; }
    .nav-container { padding: 16px 20px; }
  }

  @media (max-width: 768px) {
    .section { padding: 0 20px; margin: 60px auto; }
    .hero { padding: 0 20px; }
    .hero-img { aspect-ratio: 16 / 9; }
    .hero-content { background: linear-gradient(to top, rgba(16, 20, 24, 0.95) 0%, rgba(16, 20, 24, 0.7) 60%, transparent 100%); justify-content: flex-end; padding-bottom: 32px; padding: 24px; }
    .hero h1 { font-size: 32px; }
    .hero p { font-size: 16px; margin-bottom: 24px; }
    .hero-actions { flex-direction: column; width: 100%; }
    .hero-actions .btn { width: 100%; }
    .section-title { font-size: 28px; }
    .channels-grid { grid-template-columns: 1fr; gap: 20px; }
    .remote-grid { grid-template-columns: 1fr; gap: 20px; }
    .remote-card { padding: 16px; }
    .download-banner { padding: 40px 20px; margin-left: 20px; margin-right: 20px; }
    .download-text h2 { font-size: 28px; }
    .poster-card { flex: 0 0 160px; }
  }