* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
      background-color: #ffffff;
      color: #333333;
      line-height: 1.6;
      padding: 0;
      margin: 0;
      -webkit-tap-highlight-color: transparent;
    }

    .container {
      max-width: 800px;
      margin: 0 auto;
      padding: 20px;
    }

    header {
      text-align: center;
      padding: 40px 0 30px;
    }

    h1 {
      font-size: 2.5rem;
      margin-bottom: 12px;
      color: #2d3748;
    }

    .subtitle {
      font-size: 1.2rem;
      color: #718096;
      margin-bottom: 24px;
    }

    .btn {
      display: inline-block;
      background-color: #4299e1;
      color: white;
      padding: 12px 24px;
      border-radius: 8px;
      text-decoration: none;
      font-weight: 600;
      font-size: 1rem;
      transition: background-color 0.2s;
      border: none;
      cursor: pointer;
      touch-action: manipulation;
    }

    .btn:hover {
      background-color: #3182ce;
    }

    section {
      background: #f8fafc;
      border-radius: 12px;
      padding: 24px;
      margin-bottom: 24px;
      box-shadow: 0 2px 4px rgba(0,0,0,0.03);
    }

    h2 {
      font-size: 1.5rem;
      margin-bottom: 16px;
      color: #2d3748;
    }

    ol.steps {
      list-style: none;
      counter-reset: step-counter;
      padding-left: 0;
    }

    ol.steps li {
      position: relative;
      padding-left: 40px;
      margin-bottom: 16px;
      min-height: 36px;
    }

    ol.steps li::before {
      content: counter(step-counter);
      counter-increment: step-counter;
      position: absolute;
      left: 0;
      top: 0;
      width: 28px;
      height: 28px;
      background: #4299e1;
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 0.9rem;
    }

    .hidden {
      display: none;
    }

    .android-only,
    .non-android {
      padding: 16px;
      border-radius: 8px;
      margin-top: 16px;
    }

    .android-only {
      background-color: #ebf8ff;
      border: 1px solid #bee3f8;
    }

    .non-android {
      background-color: #fff5f5;
      border: 1px solid #fed7d7;
      color: #e53e3e;
    }

    .download-link {
      display: block;
      text-align: center;
      margin: 16px 0;
    }

    .other-versions {
      display: block;
      text-align: center;
      color: #4299e1;
      text-decoration: none;
      margin-top: 8px;
      font-size: 0.9rem;
    }

    .other-versions:hover {
      text-decoration: underline;
    }

    ul.tips {
      padding-left: 20px;
      margin: 12px 0;
    }

    ul.tips li {
      margin-bottom: 8px;
    }

    .success-message {
      background-color: #f0fff4;
      border: 1px solid #c6f6d5;
      color: #38a169;
      padding: 16px;
      border-radius: 8px;
      text-align: center;
    }

    /* Carousel Styles */
    .carousel-container {
      margin: 20px 0;
      position: relative;
      overflow: hidden;
      border-radius: 12px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
      touch-action: pan-y;
    }

    .carousel-inner {
      display: flex;
      transition: transform 0.4s ease-in-out;
      width: 100%;
    }

    .carousel-slide {
      min-width: 100%;
      padding: 24px;
      text-align: center;
      flex-shrink: 0;
    }

    .carousel-image {
      width: 220px;
      max-height: 480px;
      background: linear-gradient(135deg, #63b3ed 0%, #4299e1 100%);
      margin: 0 auto 20px;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: rgba(255,255,255,0.85);
      font-size: 16px;
      font-weight: 500;
      box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    }

    .carousel-text {
      font-size: 1.05rem;
      color: #2d3748;
      line-height: 1.6;
      max-width: 220px;
      margin: 0 auto;
    }

    .carousel-nav {
      display: flex;
      justify-content: space-between;
      position: absolute;
      top: 50%;
      width: 100%;
      transform: translateY(-50%);
      padding: 0 16px;
      pointer-events: none;
    }

    .carousel-btn {
      background: rgba(255, 255, 255, 0.85);
      border: 2px solid #4299e1;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #4299e1;
      font-weight: bold;
      font-size: 18px;
      cursor: pointer;
      pointer-events: auto;
      box-shadow: 0 2px 6px rgba(0,0,0,0.15);
      transition: all 0.2s;
      touch-action: manipulation;
    }

    .carousel-btn:hover {
      background: #4299e1;
      color: white;
      transform: scale(1.05);
    }

    .carousel-dots {
      display: flex;
      justify-content: center;
      margin-top: 20px;
      gap: 10px;
      padding: 12px 0;
    }

    .carousel-dot {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background-color: #cbd5e0;
      cursor: pointer;
      transition: all 0.3s ease;
      touch-action: manipulation;
    }

    .carousel-dot.active {
      background-color: #4299e1;
      transform: scale(1.2);
    }

    @media (max-width: 600px) {
      h1 {
        font-size: 2rem;
      }

      .subtitle {
        font-size: 1rem;
      }

      section {
        padding: 20px;
      }

      .carousel-image {
        max-width: 160px;
        font-size: 14px;
        margin-bottom: 18px;
      }

      .carousel-text {
        font-size: 1rem;
        padding: 0 10px;
        max-width: 160px;
      }

      .carousel-btn {
        width: 40px;
        height: 40px;
        font-size: 16px;
      }

      .carousel-dot {
        width: 14px;
        height: 14px;
      }

      .carousel-dots {
        gap: 8px;
        margin-top: 16px;
      }
    }