.hero {
    width: 100%;
    height: 735px;
    margin: 0 auto;
    padding: 60px;
    background-image: url(images/bg1.png);
    background-size:cover;
    background-position: center;
    /* background-repeat: no-repeat; */
    position: relative;
    margin-top: 90px;
}


/* ===== Tab 按钮 ===== */
    .tab-nav {
      position: relative;
      display: flex;
      justify-content: center;
      gap: 16px;
      padding: 20px 0 32px;
      background: rgba(7, 13, 72, 1);
      z-index: 2;
    }

    .tab-btn {
      padding: 12px 32px;
      font-size: 16px;
      font-weight: 500;
      color: rgba(255, 255, 255, 0.75);
      background: transparent;
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: 28px;
      cursor: pointer;
      transition: all 0.3s ease;
      white-space: nowrap;
    }

    .tab-btn:hover {
      color: #fff;
      border-color: rgba(255, 255, 255, 0.5);
    }

    .tab-btn.active {
      background: linear-gradient(135deg, #2563EB 0%, #3B82F6 100%);
      color: #fff;
      border-color: transparent;
      box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4);
    }