body {
        margin: 0;
        background: #000;
        overflow: hidden;
        font-family: Likurei, Arial, sans-serif;
      }
      #ui-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        padding: 40px 0;
        text-align: center;
        color: #fff;
        z-index: 10;
        pointer-events: none;
        background: linear-gradient(
          to bottom,
          rgba(0, 0, 0, 0.8) 0%,
          rgba(0, 0, 0, 0) 100%
        );
      }

      #ui-overlay h1 {
        margin: 0;
        font-size: 2.5rem;
        letter-spacing: 0.2em;
        text-shadow:
          0 0 10px #00f5ff,
          0 0 20px #00f5ff;
      }

      #ui-overlay p {
        margin: 5px 0 0;
        font-size: 0.9rem;
        opacity: 0.7;
        letter-spacing: 0.5em;
        text-transform: uppercase;
      }

      canvas {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
      }

      #contact-trigger {
        position: fixed;
        bottom: 3cap;
        right: 90px;
        width: 60px;
        height: 60px;
        background: rgba(0, 245, 255, 0.2);
        border: 1px solid #00f5ff;
        border-radius: 50%;
        display: flex;
        justify-content: center;
        align-items: center;
        color: #00f5ff;
        font-size: 24px;
        cursor: pointer;
        z-index: 100;
        transition: 0.3s;
        box-shadow: 0 0 15px rgba(0, 245, 255, 0.3);
      }
      #contact-trigger:hover {
        background: rgba(0, 245, 255, 0.4);
        transform: scale(1.1);
      }

      /* 背景のボカシとパネル */
      #contact-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.6);
        backdrop-filter: blur(8px);
        display: none;
        justify-content: center;
        align-items: center;
        z-index: 1000;
      }

      #contact-panel {
        background: rgba(5, 15, 25, 0.9);
        border: 1px solid #00f5ff;
        padding: 40px;
        width: 90%;
        max-width: 400px;
        position: relative;
        box-shadow: 0 0 30px rgba(0, 245, 255, 0.2);
      }

      #contact-panel h2 {
        color: #00f5ff;
        text-align: center;
        letter-spacing: 0.3em;
        margin-bottom: 30px;
      }

      .input-group input,
      .input-group textarea {
        width: 100%;
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(0, 245, 255, 0.3);
        margin-bottom: 15px;
        padding: 12px;
        color: #fff;
        box-sizing: border-box;
        outline: none;
      }

      #send-btn {
        width: 100%;
        padding: 15px;
        background: transparent;
        border: 1px solid #00f5ff;
        color: #00f5ff;
        cursor: pointer;
        letter-spacing: 0.2em;
        transition: 0.3s;
      }

      #send-btn:hover {
        background: #00f5ff;
        color: #000;
      }

      #close-btn {
        position: absolute;
        top: 10px;
        right: 15px;
        color: #fff;
        cursor: pointer;
        font-size: 24px;
      }
      #annotation {
        position: absolute;
        right: 11em;
        bottom: 4em;
        color: aqua;
        font-size: 15px;
      }