body {
      margin: 0;
      font-family: 'Segoe UI', sans-serif;
      background: linear-gradient(135deg, #1a2a6c, #2e4a7d, #243b55);
      height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .login-box {
      background: #ffffff;
      padding: 40px;
      border-radius: 10px;
      box-shadow: 0px 8px 20px rgba(0,0,0,0.2);
      width: 320px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .login-box h2 {
      margin-bottom: 20px;
      color: #243b55;
    }

    .login-box input {
      width: 100%;
      padding: 12px;
      margin: 10px 0;
      border: 1px solid #ccc;
      border-radius: 6px;
      transition: all 0.3s ease;
    }

    .login-box input:focus {
      border-color: #1a2a6c;
      box-shadow: 0 0 8px rgba(26,42,108,0.3);
      transform: scale(1.02);
    }

    .login-box button {
      width: 100%;
      padding: 12px;
      background: #1a2a6c;
      color: #fff;
      border: none;
      border-radius: 6px;
      cursor: pointer;
      font-size: 16px;
      transition: background 0.3s ease, transform 0.2s ease;
    }

    .login-box button:hover {
      background: #2e4a7d;
      transform: scale(1.05);
    }

    /* Animación de entrada */
    .login-box {
      animation: fadeInUp 1s ease;
    }

    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(50px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }