.banner {
    position: relative;
    width: 100%;
    height: 400px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-align: center;
    background: linear-gradient(120deg, #4e54c8, #8f94fb);
    animation: bgShift 10s infinite alternate;
  }
  /* Плавающие круги */
  .banner::before,
  .banner::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    animation: float 8s infinite ease-in-out;
  }
  .banner::before {
    width: 200px;
    height: 200px;
    top: -50px;
    left: -50px;
  }
  .banner::after {
    width: 300px;
    height: 300px;
    bottom: -100px;
    right: -100px;
    animation-duration: 12s;
  }
  @keyframes float {
    0% { transform: translateY(0) translateX(0) scale(1); }
    50% { transform: translateY(20px) translateX(20px) scale(1.1); }
    100% { transform: translateY(0) translateX(0) scale(1); }
  }
  @keyframes bgShift {
    0% { background: linear-gradient(120deg, #4e54c8, #8f94fb); }
    50% { background: linear-gradient(120deg, #ff7e5f, #feb47b); }
    100% { background: linear-gradient(120deg, #43cea2, #185a9d); }
  }
  .banner .content {
    position: relative;
    z-index: 1;
    max-width: 80%;
    animation: fadeIn 2s ease-out forwards;
    opacity: 0;
  }
  @keyframes fadeIn { to { opacity: 1; } }
  .banner .title {
    font-size: 3rem;
    margin-bottom: 20px;
    animation: slideInDown 1s ease-out;
  }
  @keyframes slideInDown {
    from { transform: translateY(-30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
  }
  .banner .description {
    font-size: 1.2rem;
    margin-bottom: 30px;
    animation: slideInUp 1s ease-out 0.5s both;
  }
  @keyframes slideInUp {
    from { transform: translateY(30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
  }
  .banner .btn {
    display: inline-block;
    padding: 15px 30px;
    font-size: 1rem;
    color: #4e54c8;
    background: white;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    overflow: hidden;
    transition: transform 0.3s ease;
    animation: fadeIn 2s ease-out 1s forwards;
  }
  .banner .btn:hover { transform: scale(1.05); }