* {
      box-sizing: border-box
    }

    body {
      margin: 0;
      font-family: Arial, Helvetica, sans-serif;
      background: #071127;
      color: #eef2ff;
      padding: 24px;
      display: flex;
      justify-content: center
    }

    .wrap {
      max-width: 980px;
      width: 100%
    }

    header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 18px
    }

    .logo {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: #ff6b6b;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: #071127
    }

    h1 {
      margin: 0;
      font-size: 20px
    }

    p.lead {
      margin: 6px 0 0;
      color: #c7d2fe;
      font-size: 13px
    }

    .drum-stage {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
      margin-top: 18px
    }

    .pad {
      background: #0b1220;
      border-radius: 12px;
      padding: 14px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 110px;
      cursor: pointer;
      border: 1px solid rgba(255, 255, 255, 0.03)
    }

    .pad:focus {
      outline: 3px solid rgba(99, 102, 241, 0.18)
    }

    .key {
      font-weight: 800;
      font-size: 20px;
      margin-bottom: 8px
    }

    .label {
      font-size: 14px;
      color: #a5b4fc;
      margin-bottom: 6px
    }

    .desc {
      font-size: 12px;
      color: #9ca3ff
    }

    .controls {
      display: flex;
      gap: 12px;
      align-items: center;
      margin-top: 14px
    }

    .btn {
      padding: 8px 12px;
      border-radius: 8px;
      border: 0;
      background: #7c3aed;
      color: white;
      cursor: pointer;
      font-weight: 700
    }

    .range {
      width: 160px
    }

    .pad.active {
      transform: scale(0.94);
      background: #6366f1;
      transition: 0.1s;
    }


    @media (max-width:760px) {
      .drum-stage {
        grid-template-columns: repeat(2, 1fr)
      }
    }

    @media (max-width:420px) {
      .drum-stage {
        grid-template-columns: 1fr
      }
    }