* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: Arial, sans-serif;
    }

body {
      background-color: #f5f7fa;

      overflow-x: hidden;
    }

    .hero {
      /* 关键设置：占满整个视口高度 */
      min-height: 100vh;
      background: linear-gradient(to bottom, #0f172a, #1e293b);
      color: white;
      padding: 20px;
      text-align: center;
      position: relative;
      overflow: hidden;

      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url("bgpic.jpg");
      opacity: 0.2;
    }

    .hero-content {
     
      max-width: 800px;
      width: 100%;
      padding: 20px;
    }

    .hero h1 {
      font-size: clamp(2rem, 5vw, 3.5rem);
      margin-bottom: 15px;
      line-height: 1.2;
    }

    .hero p {
      font-size: clamp(1rem, 2vw, 1.25rem);
      margin-bottom: 60px;
      max-width: 600px;
      margin-left: auto;
      margin-right: auto;
    }

    .btn {
      display: inline-block;
      padding: 14px 24px;
      background-color: #10b981;
      color: white;
      text-decoration: none;
      border-radius: 8px;
      font-size: 1.3rem;
      font-weight: 800;
      transition: all 0.3s ease;
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
      }

      70% {
        scale: 1.01;
        box-shadow: 0 0 0 10px rgba(16, 185, 129, 0);
      }

      100% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
      }
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 40px 20px;
    }

    .section-title {
      text-align: center;
      margin-bottom: 10px;
      font-size: 1.8rem;
    }

    .section-subtitle {
      text-align: center;
      margin-bottom: 40px;
      color: #64748b;
    }

    .features,
    .alert-features {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
      margin-bottom: 40px;
    }

    .feature-card,
    .alert-feature-card {
      background-color: white;
      border-radius: 8px;
      padding: 20px;
      box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    }

    .feature-card i,
    .alert-feature-card i {
      font-size: 1.8rem;
      color: #10b981;
      margin-bottom: 15px;
    }

    .feature-card h3,
    .alert-feature-card h3 {
      margin-bottom: 10px;
      font-size: 1.2rem;
    }

    .feature-card p,
    .alert-feature-card p {
      color: #64748b;
      line-height: 1.6;
    }

    .cta {
      background-color: #e2e8f0;
      padding: 40px 20px;
      text-align: center;
      border-radius: 8px;
    }

    .cta h2 {
      margin-bottom: 15px;
    }

    .cta p {
      margin-bottom: 20px;
      color: #64748b;
    }

    .floating-btn {
      position: fixed;
      bottom: 20px;
      right: 20px;
      width: 50px;
      height: 50px;
      background-color: #10b981;
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
      animation: pulse 2s infinite;
    }
	 @media (max-width: 768px) {
      .hero {
        padding: 10px;
      }
      
      .btn {
        padding: 12px 24px;
        font-size: 1rem;
      }
    }