.toggle-btn {
      position: relative;
      width: 40px;
      height: 40px;
      border-radius: 4px;
      border: none;
      cursor: pointer;
      
      background: radial-gradient(circle at 20% 20%, #0f172a, #020617 60%);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0;
      overflow: hidden;
    }

    .toggle-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 15px 30px rgba(37, 99, 235, 0.35);
    }

    .toggle-btn__icon {
      position: absolute;
      width: 24px;
      height: 24px;
      fill: #fff;
      transition: opacity 0.15s ease-in-out, transform 0.2s ease-in-out;
      opacity: 0;
      transform: scale(0.9);
    }

    .toggle-btn__icon--show {
      opacity: 1;
      transform: scale(1);
    }

    .toggle-btn.is-hidden .toggle-btn__icon--show {
      opacity: 0;
      transform: scale(0.9);
    }

    .toggle-btn.is-hidden .toggle-btn__icon--hide {
      opacity: 1;
      transform: scale(1);
    }

    .target-box {
      margin-left: 16px;
      padding: 8px 16px;
      border-radius: 8px;
      background: #020617;
      color: #e2e8f0;
      border: 1px solid #1f2937;
    }