:root {
      --primary: rgb(147, 51, 234);
      --primary-hover: rgb(124, 58, 237);
      --glacier-blue: #1D7BFF;
      --deep-ink: #0B0F19;
      --card-bg: rgba(255, 255, 255, 0.04);
      --border-color: rgba(255, 255, 255, 0.08);
      --text-main: #E2E8F0;
      --text-muted: #94A3B8;
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { background-color: var(--deep-ink); color: var(--text-main); font-family: var(--font-family); line-height: 1.6; }
    a { color: inherit; text-decoration: none; transition: all 0.3s ease; }
    .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

    
    .header { background-color: rgba(11, 15, 25, 0.85); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 100; height: 70px; display: flex; align-items: center; }
    .header-box { display: flex; justify-content: space-between; align-items: center; width: 100%; }
    .logo { display: inline-flex; align-items: center; gap: 12px; }
    .logo img { height: 40px; max-width: 160px; object-fit: contain; }
    .logo span { font-size: 18px; font-weight: 800; color: #FFF; }
    .nav-list { display: flex; gap: 24px; align-items: center; }
    .nav-list a { font-size: 15px; color: var(--text-muted); }
    .nav-list a:hover { color: var(--glacier-blue); }
    .menu-toggle { display: none; background: none; border: none; color: #FFF; font-size: 24px; cursor: pointer; }

    
    .mobile-drawer { position: fixed; top: 0; left: -280px; width: 280px; height: 100%; background-color: var(--deep-ink); border-right: 1px solid var(--border-color); z-index: 200; transition: left 0.3s ease; padding: 24px; display: flex; flex-direction: column; gap: 30px; }
    .mobile-drawer.active { left: 0; }
    .drawer-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.6); backdrop-filter: blur(4px); z-index: 199; display: none; }
    .drawer-overlay.active { display: block; }
    .drawer-header { display: flex; justify-content: space-between; align-items: center; }
    .drawer-close { background: none; border: none; color: #FFF; font-size: 24px; cursor: pointer; }
    .drawer-nav { display: flex; flex-direction: column; gap: 20px; }
    .drawer-nav a { font-size: 16px; color: #FFF; }

    
    .download-hero {
      background: radial-gradient(circle at 50% 50%, rgba(147, 51, 234, 0.1) 0%, rgba(11, 15, 25, 1) 80%);
      padding: 80px 0;
      text-align: center;
      border-bottom: 1px solid var(--border-color);
    }
    .download-hero h1 { font-size: 40px; color: #FFF; font-weight: 800; margin-bottom: 16px; }
    .download-hero p { font-size: 18px; color: var(--text-muted); max-width: 600px; margin: 0 auto; }

    
    .download-cards { padding: 80px 0; }
    .download-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
    .dl-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 40px 30px;
      text-align: center;
      transition: all 0.3s ease;
    }
    .dl-card:hover {
      transform: translateY(-6px);
      border-color: var(--primary);
      box-shadow: 0 10px 30px rgba(147, 51, 234, 0.15);
    }
    .dl-icon { font-size: 48px; margin-bottom: 20px; }
    .dl-title { font-size: 22px; color: #FFF; font-weight: 600; margin-bottom: 12px; }
    .dl-desc { font-size: 14px; color: var(--text-muted); margin-bottom: 30px; min-height: 48px; }
    .dl-btn {
      display: inline-block; width: 100%; padding: 12px 24px; background: var(--primary);
      color: #FFF; border-radius: 8px; font-weight: 600; text-align: center;
    }
    .dl-btn:hover { background: var(--primary-hover); }

    
    .inst-section { padding: 60px 0; background-color: rgba(255,255,255,0.01); border-top: 1px solid var(--border-color); }
    .inst-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; }
    .inst-box h3 { font-size: 20px; color: #FFF; font-weight: 600; margin-bottom: 16px; }
    .inst-box p { font-size: 14px; color: var(--text-muted); margin-bottom: 12px; }

    
    .footer { background-color: #060911; border-top: 1px solid var(--border-color); padding: 60px 0 30px; }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
    .footer-about p { margin-top: 15px; color: var(--text-muted); font-size: 14px; }
    .footer-col h4 { color: #FFF; font-size: 16px; margin-bottom: 20px; }
    .footer-col ul { display: flex; flex-direction: column; gap: 12px; }
    .footer-col ul a { color: var(--text-muted); font-size: 14px; }
    .footer-col ul a:hover { color: var(--glacier-blue); }
    .footer-bottom { border-top: 1px solid var(--border-color); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; color: var(--text-muted); font-size: 13px; flex-wrap: wrap; gap: 15px; }

    @media (max-width: 1024px) {
      .download-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-list { display: none; }
      .menu-toggle { display: block; }
      .download-grid { grid-template-columns: 1fr; }
      .inst-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }