:root {
      --primary-color: #1D7BFF;
      --dark-bg: #0B111E;
      --silver-white: #F5F7FA;
      --text-dark: #0F172A;
      --text-muted: #64748B;
      --glass-border: rgba(255, 255, 255, 0.08);
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: var(--font-family); background-color: var(--silver-white); color: var(--text-dark); line-height: 1.6; }

    
    .site-header { background-color: var(--dark-bg); border-bottom: 1px solid var(--glass-border); position: sticky; top: 0; z-index: 1000; backdrop-filter: blur(10px); }
    .header-container { max-width: 1200px; margin: 0 auto; padding: 15px 20px; 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: 20px; font-weight: 800; color: #fff; white-space: nowrap; }
    .desktop-nav { display: flex; gap: 30px; }
    .desktop-nav a { color: #D1D5DB; text-decoration: none; font-weight: 500; font-size: 15px; }
    .desktop-nav a:hover { color: var(--primary-color); }
    .header-actions { display: flex; align-items: center; gap: 15px; }
    .btn { display: inline-flex; align-items: center; justify-content: center; padding: 10px 20px; border-radius: 6px; font-weight: 600; text-decoration: none; cursor: pointer; transition: 0.3s; }
    .btn-primary { background-color: var(--primary-color); color: #fff; border: none; }
    .btn-primary:hover { background-color: #0062cc; }
    .btn-sm { padding: 8px 16px; font-size: 14px; }
    .mobile-menu-btn { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 6px; }
    .mobile-menu-btn span { display: block; width: 25px; height: 2px; background-color: #fff; }

    
    .mobile-drawer-mask { position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; background-color: rgba(0,0,0,0.6); z-index: 1001; opacity: 0; pointer-events: none; transition: 0.3s; }
    .mobile-drawer-mask.active { opacity: 1; pointer-events: auto; }
    .mobile-drawer { position: fixed; top: 0; left: -320px; width: 300px; height: 100vh; background-color: var(--dark-bg); z-index: 1002; padding: 25px; display: flex; flex-direction: column; transition: 0.3s; }
    .mobile-drawer.active { left: 0; }
    .drawer-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 40px; }
    .drawer-close-btn { background: none; border: none; font-size: 28px; color: #fff; cursor: pointer; }
    .drawer-nav { display: flex; flex-direction: column; gap: 20px; }
    .drawer-nav a { color: #D1D5DB; text-decoration: none; font-size: 18px; }
    .drawer-footer { border-top: 1px solid var(--glass-border); padding-top: 20px; color: #9CA3AF; font-size: 14px; }

    
    .about-header { background: var(--dark-bg); color: #fff; padding: 80px 20px; text-align: center; }
    .about-header h1 { font-size: 40px; font-weight: 800; margin-bottom: 15px; }
    .about-header p { color: #94A3B8; max-width: 700px; margin: 0 auto; font-size: 18px; }

    
    .about-container { max-width: 900px; margin: 60px auto; padding: 0 20px; }
    .about-section { margin-bottom: 50px; }
    .about-section h2 { font-size: 28px; color: var(--text-dark); margin-bottom: 20px; font-weight: 700; position: relative; padding-bottom: 10px; }
    .about-section h2::after { content: ''; position: absolute; left: 0; bottom: 0; width: 50px; height: 3px; background-color: var(--primary-color); }
    .about-section p { font-size: 16px; color: var(--text-muted); line-height: 1.8; margin-bottom: 20px; }

    
    .values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 40px 0; }
    .value-card { background: #fff; border: 1px solid #E2E8F0; border-radius: 8px; padding: 25px; text-align: center; }
    .value-card h3 { font-size: 18px; margin-bottom: 10px; color: var(--text-dark); }
    .value-card p { font-size: 14px; color: var(--text-muted); }

    
    .site-footer { background-color: var(--dark-bg); color: #9CA3AF; padding: 80px 20px 40px; border-top: 1px solid var(--glass-border); }
    .footer-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 60px; margin-bottom: 60px; }
    .footer-brand .logo { margin-bottom: 20px; }
    .footer-desc { font-size: 14px; line-height: 1.6; }
    .footer-links-col h4 { color: #fff; font-size: 16px; margin-bottom: 20px; }
    .footer-links-col ul { list-style: none; }
    .footer-links-col ul li { margin-bottom: 12px; }
    .footer-links-col ul li a { color: #9CA3AF; text-decoration: none; font-size: 14px; transition: color 0.3s; }
    .footer-links-col ul li a:hover { color: var(--primary-color); }
    .footer-bottom { border-top: 1px solid var(--glass-border); padding-top: 30px; }
    .footer-bottom-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; font-size: 14px; }
    .footer-bottom-container a { color: #9CA3AF; text-decoration: none; }
    .footer-bottom-container a:hover { color: var(--primary-color); }

    @media (max-width: 768px) {
      .desktop-nav, .header-actions .btn { display: none; }
      .mobile-menu-btn { display: flex; }
      .values-grid { grid-template-columns: 1fr; }
      .footer-container { grid-template-columns: 1fr; gap: 40px; }
      .footer-bottom-container { flex-direction: column; gap: 15px; text-align: center; }
    }