:root {
      --primary-color: rgb(243,244,246);
      --accent-color: #e11d48;
      --text-dark: #1f2937;
      --text-light: #4b5563;
      --text-muted: #9ca3af;
      --bg-body: #f9fafb;
      --bg-card: #ffffff;
      --border-color: #e5e7eb;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-body);
      color: var(--text-dark);
      line-height: 1.6;
    }
    a { color: inherit; text-decoration: none; transition: color 0.2s; }
    a:hover { color: var(--accent-color); }

    
    header {
      background-color: var(--bg-card);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 100;
    }
    .header-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 16px;
      height: 70px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }
    .logo img {
      display: block;
      height: 40px;
      width: auto;
      max-width: 160px;
      object-fit: contain;
      flex-shrink: 0;
    }
    .logo span {
      display: inline-block;
      font-size: 18px;
      font-weight: 800;
      line-height: 1;
      color: var(--text-dark);
      white-space: nowrap;
    }
    .nav-desktop {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .nav-desktop a { font-weight: 500; color: var(--text-light); }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
    }

    
    .drawer {
      position: fixed;
      top: 0;
      left: -280px;
      width: 280px;
      height: 100%;
      background-color: var(--bg-card);
      box-shadow: 2px 0 8px rgba(0,0,0,0.15);
      z-index: 200;
      transition: left 0.3s ease;
      display: flex;
      flex-direction: column;
      padding: 20px;
    }
    .drawer.active { left: 0; }
    .drawer-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
    }
    .drawer-close { background: none; border: none; font-size: 24px; cursor: pointer; }
    .drawer-nav { display: flex; flex-direction: column; gap: 18px; }
    .drawer-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: rgba(0,0,0,0.5);
      z-index: 150;
      display: none;
    }
    .drawer-overlay.active { display: block; }

    
    .dl-main {
      max-width: 800px;
      margin: 48px auto;
      padding: 0 16px;
    }
    .dl-card {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 40px;
      text-align: center;
    }
    .dl-header h1 {
      font-size: 26px;
      font-weight: 800;
      margin-bottom: 12px;
    }
    .dl-subtitle {
      color: var(--text-light);
      font-size: 14px;
      margin-bottom: 32px;
    }
    .dl-action-box {
      background-color: var(--primary-color);
      padding: 24px;
      border-radius: 8px;
      margin-bottom: 32px;
    }
    .dl-action-box h2 {
      font-size: 18px;
      margin-bottom: 12px;
    }
    .btn-action {
      display: inline-block;
      background-color: var(--accent-color);
      color: #fff;
      font-weight: 700;
      padding: 12px 32px;
      border-radius: 6px;
      font-size: 15px;
      box-shadow: 0 4px 12px rgba(225, 29, 72, 0.2);
    }
    .btn-action:hover {
      background-color: #be123c;
      color: #fff;
    }
    .dl-instructions {
      text-align: left;
      color: var(--text-light);
    }
    .dl-instructions h3 {
      font-size: 16px;
      color: var(--text-dark);
      margin-bottom: 12px;
    }
    .dl-instructions ol {
      padding-left: 20px;
      font-size: 14px;
      line-height: 1.8;
    }
    .dl-instructions li {
      margin-bottom: 8px;
    }

    
    footer {
      background-color: #111827;
      color: #e5e7eb;
      padding: 48px 16px 24px;
      margin-top: 64px;
      border-top: 1px solid var(--border-color);
    }
    .footer-container {
      max-width: 1200px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr;
      gap: 40px;
      padding-bottom: 32px;
      border-bottom: 1px solid #374151;
    }
    .footer-brand .logo span { color: #fff; }
    .footer-brand p { font-size: 14px; color: #9ca3af; margin-top: 16px; }
    .footer-title { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 16px; }
    .footer-links { list-style: none; display: flex; flex-direction: column; gap: 10px; }
    .footer-links a { font-size: 14px; color: #9ca3af; }
    .friend-links {
      max-width: 1200px;
      margin: 24px auto 0;
      padding-bottom: 24px;
      border-bottom: 1px solid #374151;
    }
    .friend-title { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: 12px; }
    .friend-content { display: flex; flex-wrap: wrap; gap: 16px; }
    .friend-content a { font-size: 13px; color: #9ca3af; }
    .footer-copyright {
      max-width: 1200px;
      margin: 24px auto 0;
      text-align: center;
      font-size: 13px;
      color: #6b7280;
    }

    @media (max-width: 768px) {
      .nav-desktop { display: none; }
      .menu-toggle { display: block; }
      .dl-card { padding: 24px; }
    }
    @media (max-width: 992px) {
      .footer-container { grid-template-columns: 1fr; gap: 32px; }
    }