* { margin: 0; padding: 0; box-sizing: border-box; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: #0a0e1a;
    color: #e0e0e0;
    line-height: 1.6;
    overflow-x: hidden;
  }

  /* 顶部导航 */
  .navbar {
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
    padding: 0 40px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
  }
  .navbar .logo {
    font-size: 22px;
    font-weight: 800;
    background: linear-gradient(135deg, #ff6b35, #f7931e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }
  .navbar .nav-links {
    display: flex;
    gap: 32px;
  }
  .navbar .nav-links a {
    color: #a0a8b8;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s;
  }
  .navbar .nav-links a:hover {
    color: #ff6b35;
  }

  /* 英雄区 */
  .hero {
    padding: 140px 40px 80px;
    text-align: center;
    background: 
      radial-gradient(ellipse at 20% 50%, rgba(255,107,53,0.08) 0%, transparent 50%),
      radial-gradient(ellipse at 80% 50%, rgba(247,147,30,0.06) 0%, transparent 50%),
      #0a0e1a;
  }
  .hero h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff 0%, #ff6b35 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }
  .hero .subtitle {
    font-size: 18px;
    color: #8a92a8;
    margin-bottom: 40px;
  }
  .hero .download-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
  }
  .btn {
    padding: 14px 36px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
  }
  .btn-primary {
    background: linear-gradient(135deg, #ff6b35, #f7931e);
    color: #fff;
    box-shadow: 0 8px 32px rgba(255,107,53,0.3);
  }
  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(255,107,53,0.4);
  }
  .btn-secondary {
    background: rgba(255,255,255,0.05);
    color: #e0e0e0;
    border: 1px solid rgba(255,255,255,0.1);
  }
  .btn-secondary:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-2px);
  }

  /* 内容区 */
  .content {
    max-width: 900px;
    margin: 0 auto;
    padding: 60px 40px;
  }
  .section-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 40px;
    text-align: center;
    color: #fff;
  }
  .section-title span {
    color: #ff6b35;
  }

  /* FAQ卡片 */
  .faq-card {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 16px;
    padding: 32px;
    margin-bottom: 24px;
    transition: all 0.3s;
  }
  .faq-card:hover {
    background: rgba(255,255,255,0.05);
    border-color: rgba(255,107,53,0.2);
    transform: translateY(-2px);
  }
  .faq-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: #ff6b35;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .faq-card h3 .num {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #ff6b35, #f7931e);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: #fff;
    flex-shrink: 0;
  }
  .faq-card p {
    color: #a0a8b8;
    font-size: 15px;
    line-height: 1.8;
  }
  .faq-card .highlight {
    color: #f7931e;
    font-weight: 600;
  }
  .faq-card ul {
    margin-top: 12px;
    padding-left: 20px;
  }
  .faq-card ul li {
    color: #a0a8b8;
    margin-bottom: 8px;
    font-size: 15px;
  }

  /* 特性区 */
  .features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    margin-top: 40px;
  }
  .feature-card {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 16px;
    padding: 28px;
    text-align: center;
    transition: all 0.3s;
  }
  .feature-card:hover {
    background: rgba(255,255,255,0.05);
    transform: translateY(-4px);
  }
  .feature-card .icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, #ff6b35, #f7931e);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 24px;
  }
  .feature-card h4 {
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
  }
  .feature-card p {
    font-size: 14px;
    color: #8a92a8;
  }

  /* 底部 */
  .footer {
    background: rgba(0,0,0,0.3);
    border-top: 1px solid rgba(255,255,255,0.05);
    padding: 40px;
    text-align: center;
    color: #5a6070;
    font-size: 13px;
  }

  /* 右侧浮动联系方式 */
  .float-contact {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .float-btn {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    transition: all 0.3s;
    box-shadow: 0 4px 16px rgba(0,0,0,0.3);
    border: none;
    color: #fff;
    font-size: 22px;
  }
  .float-btn:hover {
    transform: scale(1.1);
  }
  .float-btn .tooltip {
    position: absolute;
    right: 64px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.85);
    color: #fff;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 13px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
  }
  .float-btn:hover .tooltip {
    opacity: 1;
  }
  .float-btn.wechat { background: linear-gradient(135deg, #07c160, #05a050); }
  .float-btn.qq { background: linear-gradient(135deg, #12b7f5, #0a9bd8); }
  .float-btn.phone { background: linear-gradient(135deg, #ff6b35, #f7931e); }
  .float-btn.email { background: linear-gradient(135deg, #ea4335, #c62828); }
  .float-btn.telegram { background: linear-gradient(135deg, #0088cc, #006699); }
  .float-btn.top {
    background: linear-gradient(135deg, #5a6070, #3a4050);
    margin-top: 8px;
  }

  /* 弹窗 */
  .modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
  }
  .modal-overlay.active { display: flex; }
  .modal {
    background: #1a1f2e;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    max-width: 360px;
    width: 90%;
    position: relative;
  }
  .modal .close {
    position: absolute;
    top: 16px;
    right: 20px;
    font-size: 24px;
    color: #8a92a8;
    cursor: pointer;
  }
  .modal .qr-placeholder {
    width: 180px;
    height: 180px;
    background: #fff;
    border-radius: 12px;
    margin: 20px auto;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
    font-size: 14px;
  }
  .modal h3 {
    color: #fff;
    font-size: 20px;
    margin-bottom: 8px;
  }
  .modal p {
    color: #8a92a8;
    font-size: 14px;
  }
  .modal .copy-btn {
    margin-top: 16px;
    padding: 10px 24px;
    background: linear-gradient(135deg, #ff6b35, #f7931e);
    border: none;
    border-radius: 8px;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
  }

  @media (max-width: 768px) {
    .hero h1 { font-size: 32px; }
    .navbar .nav-links { display: none; }
    .float-contact { right: 10px; }
    .float-btn { width: 44px; height: 44px; font-size: 18px; }
    .content { padding: 40px 20px; }
  }