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

    body {
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
      background: #f7f8fa;
      color: #1e1e2a;
      line-height: 1.5;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    .site-shell {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
      width: 100%;
      display: flex;
      flex-direction: column;
      flex: 1;
    }

    /* header 沿用原风格但稍作适配 */
    .site-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 1.5rem 0;
      border-bottom: 1px solid rgba(0, 0, 0, 0.05);
      flex-wrap: wrap;
      gap: 1rem;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 0.65rem;
      text-decoration: none;
      color: #1e1e2a;
      font-weight: 600;
      font-size: 1.3rem;
      letter-spacing: -0.01em;
    }

    .brand img {
      display: block;
      border-radius: 10px;
    }

    nav {
      display: flex;
      align-items: center;
      gap: 1.75rem;
      font-weight: 500;
    }

    nav a {
      text-decoration: none;
      color: #4a4a5a;
      transition: color 0.2s;
      font-size: 0.95rem;
    }

    nav a:hover {
      color: #000;
    }

    .nav-contact {
      background: #1e1e2a;
      color: white !important;
      padding: 0.5rem 1.1rem;
      border-radius: 30px;
      font-size: 0.9rem;
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
    }

    .nav-contact:hover {
      background: #2d2d3d;
    }

    /* 主内容 */
    main {
      flex: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 2.5rem 0 3rem;
    }

    .download-hero {
      display: flex;
      flex-direction: row;
      align-items: center;
      gap: 4rem;
      max-width: 1000px;
      width: 100%;
      margin: 0 auto;
    }

    /* 应用截图展示区 */
    .app-preview {
      flex: 0 0 300px;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .phone-mock {
      background: #ffffff;
      border-radius: 36px;
      box-shadow: 0 25px 50px -10px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.02);
      padding: 12px;
      width: 100%;
      max-width: 280px;
      transition: transform 0.2s;
    }

    .phone-mock img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 26px;
      background: #eef0f5;
      aspect-ratio: 9 / 19;
      object-fit: cover;
    }

    /* 右侧下载内容 */
    .download-content {
      flex: 1;
      text-align: left;
    }

    .eyebrow {
      font-size: 0.85rem;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: #6b7280;
      font-weight: 600;
      margin-bottom: 0.5rem;
    }

    h1 {
      font-size: 3.2rem;
      font-weight: 700;
      letter-spacing: -0.03em;
      line-height: 1.1;
      margin-bottom: 1rem;
      color: #0b0b14;
    }

    .subhead {
      font-size: 1.2rem;
      color: #4a4a5a;
      margin-bottom: 2.5rem;
      max-width: 500px;
      line-height: 1.5;
    }

    .store-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      align-items: center;
    }

    .store-btn {
      display: inline-flex;
      align-items: center;
      gap: 0.8rem;
      background: #1e1e2a;
      color: #fff;
      text-decoration: none;
      border-radius: 14px;
      padding: 0.75rem 1.5rem;
      min-width: 180px;
      transition: background 0.2s, transform 0.1s;
      box-shadow: 0 8px 18px -8px rgba(0, 0, 0, 0.2);
      border: 1px solid rgba(255, 255, 255, 0.05);
    }

    .store-btn:hover {
      background: #2d2d3d;
      transform: translateY(-2px);
    }

    .store-btn:active {
      transform: translateY(0);
    }

    .store-icon {
      font-size: 1.8rem;
      line-height: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .store-text {
      display: flex;
      flex-direction: column;
      line-height: 1.2;
    }

    .store-text small {
      font-size: 0.7rem;
      opacity: 0.8;
      letter-spacing: 0.02em;
    }

    .store-text strong {
      font-size: 1.1rem;
      font-weight: 600;
      letter-spacing: -0.01em;
    }

    /* 底部小提示 */
    .download-note {
      margin-top: 2rem;
      font-size: 0.9rem;
      color: #6b7280;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .download-note span {
      display: inline-block;
    }

    /* footer 沿用原风格 */
    .site-footer {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 1.5rem 0;
      border-top: 1px solid rgba(0, 0, 0, 0.05);
      flex-wrap: wrap;
      gap: 1rem;
      font-size: 0.9rem;
      color: #5b5b6b;
    }

    .footer-brand {
      font-weight: 600;
      color: #1e1e2a;
      text-decoration: none;
      font-size: 1rem;
    }

    .site-footer nav {
      gap: 1.5rem;
    }

    .site-footer nav a {
      font-size: 0.9rem;
      color: #5b5b6b;
      text-decoration: none;
    }

    .site-footer nav a:hover {
      color: #1e1e2a;
    }

    /* skip link 对下载页保留（可访问性） */
    .skip-link {
      position: absolute;
      top: -40px;
      left: 0;
      background: #1e1e2a;
      color: white;
      padding: 0.5rem 1rem;
      text-decoration: none;
      border-radius: 0 0 8px 0;
      z-index: 100;
    }

    .skip-link:focus {
      top: 0;
    }

    /* 响应式 */
    @media (max-width: 800px) {
      .download-hero {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
      }

      .download-content {
        text-align: center;
      }

      .subhead {
        margin-left: auto;
        margin-right: auto;
      }

      .store-buttons {
        justify-content: center;
      }

      h1 {
        font-size: 2.5rem;
      }

      .app-preview {
        flex: 0 0 auto;
      }

      .phone-mock {
        max-width: 220px;
      }
    }

    @media (max-width: 480px) {
      .site-header {
        flex-direction: column;
        align-items: flex-start;
      }

      nav {
        width: 100%;
        justify-content: space-between;
      }

      .store-btn {
        width: 100%;
        justify-content: center;
      }

      h1 {
        font-size: 2.2rem;
      }
    }