* {
        box-sizing: border-box;
      }
      body {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
        margin: 0;
        padding: 32px 20px;
        text-align: center;
        background: #fff;
        color: #222;
        line-height: 1.5;
        min-height: 100vh;
      }
      .wrapper {
        max-width: 480px;
        margin: 0 auto;
      }
      h1 {
        font-size: 26px;
        font-weight: 600;
        margin: 0;
        color: #111;
      }
      .subtitle {
        font-size: 15px;
        color: #666;
        margin-top: 8px;
        margin-bottom: 32px;
      }
      .loading {
        display: none;
        margin: 60px 0;
      }
      .spinner {
        border: 2px solid #ddd;
        border-top-color: #333;
        border-radius: 50%;
        width: 32px;
        height: 32px;
        animation: spin 0.8s linear infinite;
        margin: 20px auto;
      }
      @keyframes spin {
        to {
          transform: rotate(360deg);
        }
      }
      .loading-text {
        font-size: 16px;
        color: #444;
      }
      .content {
        display: block;
      }

      .steps-container {
        display: flex;
        flex-direction: column;
        gap: 20px;
      }

      .step {
        padding: 24px;
        border: 1px solid #ddd;
        border-radius: 12px;
        text-align: center;
        background: #fafafa;
      }
      .step-header {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
        margin-bottom: 12px;
      }
      .step-number {
        width: 28px;
        height: 28px;
        border: 1px solid #999;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 600;
        font-size: 14px;
        flex-shrink: 0;
        color: #555;
      }
      .step-title {
        font-size: 18px;
        font-weight: 600;
        margin: 0;
        color: #222;
      }
      .step-description {
        font-size: 14px;
        margin-bottom: 16px;
        color: #666;
      }

      .store-buttons {
        display: flex;
        flex-direction: column;
        gap: 6px;
        justify-content: center;
        flex-wrap: wrap;
      }
      .store-button {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        padding: 12px 20px;
        font-size: 14px;
        font-weight: 500;
        border: 1px solid #ccc;
        border-radius: 8px;
        text-decoration: none;
        color: #333;
        background: #fff;
        transition: all 0.15s;
      }
      .store-button:hover {
        background: #f5f5f5;
        border-color: #999;
      }
      .store-link {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 6px;
        padding: 8px 0;
        font-size: 13px;
        font-weight: 400;
        text-decoration: underline;
        text-underline-offset: 2px;
        color: #666;
        background: none;
        border: none;
        transition: color 0.15s;
      }
      .store-link:hover {
        color: #333;
      }
      .store-link .store-icon {
        width: 14px;
        height: 14px;
      }
      .store-icon {
        width: 18px;
        height: 18px;
      }

      .qr-section {
        background: #333;
        color: #fff;
        border-color: #333;
      }
      .qr-section .step-number {
        border-color: rgba(255, 255, 255, 0.5);
        color: #fff;
      }
      .qr-section .step-title {
        color: #fff;
      }
      .qr-section .step-description {
        color: rgba(255, 255, 255, 0.7);
      }
      .qr-code {
        width: 180px;
        height: 180px;
        margin: 0 auto 16px;
        background: #fff;
        border-radius: 8px;
        padding: 12px;
      }
      .qr-code canvas {
        width: 100%;
        height: 100%;
      }
      .open-button {
        display: inline-block;
        padding: 12px 24px;
        font-size: 14px;
        font-weight: 500;
        border: 1px solid rgba(255, 255, 255, 0.3);
        border-radius: 8px;
        text-decoration: none;
        color: #333;
        background: #fff;
        transition: opacity 0.15s;
      }
      .open-button:hover {
        opacity: 0.9;
      }

      /* Desktop styles */
      @media (min-width: 768px) {
        body {
          padding: 48px 32px;
          display: flex;
          align-items: center;
          justify-content: center;
        }
        .wrapper {
          max-width: 720px;
        }
        h1 {
          font-size: 32px;
          margin-bottom: 10px;
        }
        .subtitle {
          font-size: 16px;
          margin-bottom: 40px;
        }
        .steps-container {
          flex-direction: row;
          gap: 20px;
          align-items: stretch;
        }
        .step {
          flex: 1;
          display: flex;
          flex-direction: column;
          padding: 28px;
        }
        .step-description {
          flex-grow: 1;
        }
        .store-buttons {
          flex-direction: column;
          gap: 10px;
        }
        .qr-code {
          width: 200px;
          height: 200px;
        }
      }

      /* Large desktop */
      @media (min-width: 1024px) {
        .wrapper {
          max-width: 800px;
        }
        h1 {
          font-size: 36px;
        }
        .steps-container {
          gap: 28px;
        }
        .step {
          padding: 32px;
        }
      }

      /* Dark mode */
      @media (prefers-color-scheme: dark) {
        body {
          background: #0d0d0d;
          color: #e0e0e0;
        }
        h1 {
          color: #f5f5f5;
        }
        .subtitle {
          color: #999;
        }
        .spinner {
          border-color: #444;
          border-top-color: #ccc;
        }
        .loading-text {
          color: #aaa;
        }
        .step {
          border-color: #333;
          background: #1a1a1a;
        }
        .step-number {
          border-color: #666;
          color: #bbb;
        }
        .step-title {
          color: #f0f0f0;
        }
        .step-description {
          color: #888;
        }
        .store-button {
          border-color: #444;
          color: #e0e0e0;
          background: #222;
        }
        .store-button:hover {
          background: #2a2a2a;
          border-color: #666;
        }
        .store-link {
          color: #888;
        }
        .store-link:hover {
          color: #ccc;
        }
        .qr-section {
          background: #111;
          border-color: #333;
        }
        .qr-section .step-number {
          border-color: rgba(255, 255, 255, 0.4);
        }
        .qr-section .step-description {
          color: rgba(255, 255, 255, 0.6);
        }
        .open-button {
          background: #f0f0f0;
          color: #111;
        }
        .open-button:hover {
          background: #e0e0e0;
        }
      }