html, body {
      margin: 0;
      padding: 0;
      height: 100%;
      font-family: sans-serif;
      color: black;
      overflow: hidden;
    }

    .screen {
      display: none;
      width: 100%;
      height: 100%;
    }

    .screen.active {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }

    .intro-screen {
      background: #f0f0f0;
      text-align: center;
    }

    .intro-screen h1 {
      font-size: 36px;
      margin: 20px;
    }

    .start-button {
      padding: 12px 24px;
      font-size: 18px;
      background: #007BFF;
      color: white;
      border: none;
      border-radius: 6px;
      cursor: pointer;
      margin-bottom: 30px;
    }

    header img {
      max-width: 200px;
      margin-top: 10px;
    }

    footer {
      text-align: center;
      padding: 20px;
    }

    .image-viewer {
      position: relative;
      width: 100%;
      height: 100%;
      overflow: hidden;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .image-viewer img {
      max-width: 100%;
      max-height: 100%;
      object-fit: contain;
      transition: opacity 0.3s ease;
    }

    .nav-button {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      width: 12;
      height: 12;
      border-style: solid;
      cursor: pointer;
      opacity: 1;
    }

    .nav-button:hover {
      opacity: 0.5;
    }

    /* Левая стрелка */
    .prev {
      left: 20px;
      border-width: 25px 35px 25px 0;
      border-color: transparent black transparent transparent;
    }

    /* Правая стрелка */
    .next {
      right: 20px;
      border-width: 25px 0 25px 35px;
      border-color: transparent transparent transparent black;
    }

    .indicator {
      position: absolute;
      bottom: 0px;
      left: 50%;
      transform: translateX(-50%);
      font-size: 16px;
      color: black;
      text-shadow: 0 0 4px black;
    }