body {
        margin: 0;
        min-height: 100vh;
        background: radial-gradient(circle at top, #111 0%, #000 60%);
        color: #e0e0e0;
        font-family: monospace;

        display: flex;
        align-items: center;
        justify-content: center;
      }

      .installer {
        display: flex;
        flex-direction: column;
        align-items: center;
      }

      h1 {
        margin-bottom: 40px;
        font-size: 3.0rem;
        text-align: center;
        color: #e6e6e6;
      }

      /* Logo under header */
      .logo {
        width: 120px;
        max-width: 60%;
        height: auto;
        margin-bottom: 24px;

        filter: drop-shadow(0 0 10px rgba(77, 163, 255, 0.4));
      }

      .card {
        border: 1px solid #2a2a2a;
        padding: 24px;
        border-radius: 14px;
        width: 360px;
        background: linear-gradient(180deg, #141414, #0e0e0e);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6),
          inset 0 1px 0 rgba(255, 255, 255, 0.03);
      }

      .card p {
        margin-top: 0;
        margin-bottom: 12px;
        color: #aaa;
      }

      .firmware-select button {
        width: 100%;
        margin-bottom: 10px;
        padding: 12px;
        background: #181818;
        color: #ddd;
        border: 1px solid #2c2c2c;
        border-radius: 8px;
        cursor: pointer;
        transition: all 0.15s ease;
      }

      .firmware-select button:hover {
        border-color: #4da3ff;
      }

      .firmware-select button.active {
        background: #111c2a;
        border-color: #4da3ff;
        color: #4da3ff;
      }

      input {
        width: 100%;
        background: #1a1a1a;
        color: #e0e0e0;
        border: 1px solid #333;
        padding: 6px;
        border-radius: 4px;
      }

      .install-btn button {
        width: 100%;
        padding: 12px;
        background: #4da3ff;
        color: #000;
        border: none;
        border-radius: 6px;
        cursor: pointer;
        font-weight: bold;
      }

      .footer-link {
        margin-top: 16px;
        font-size: 0.85rem;
        opacity: 0.8;
      }

      .footer-link a {
        color: #4da3ff;
        text-decoration: none;
      }

      .footer-link a:hover {
        text-decoration: underline;
      }

      @media (max-width: 480px) {
        .card {
          width: 90%;
        }

        .logo {
          width: 96px;
        }
      }