body {
      margin: 0;
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #1a1a1a;
      font-family: "Inter", sans-serif;
    }

    .btn {
      position: relative;
      padding: 1rem 2.5rem;
      font-size: 1.1rem;
      font-weight: 600;
      color: white;
      background: none;
      border: 2px solid #6a5acd;
      border-radius: 10px;
      cursor: pointer;
      overflow: hidden;
      transition: all 0.3s ease;
    }

    .btn span {
      position: relative;
      z-index: 2;
    }

    .liquid {
      background: linear-gradient(90deg, #00b4ff, #6a5acd, #ff4ecd) 
        no-repeat calc(200% - var(--p, 0%)) 100% / 200% var(--p, 0.2em);
      transition: 0.4s var(--t, 0s),
        background-position 0.4s calc(0.4s - var(--t, 0s));
    }

    .liquid:hover {
      --p: 100%;
      --t: 0.4s;
      color: #fff;
      box-shadow: 0 6px 20px rgba(106, 90, 205, 0.5);
    }