:root {
            --primary: rgb(209,213,219);
            --primary-dark: #9ca3af;
            --primary-light: #f3f4f6;
            --accent: #f59e0b;
            --accent-red: #ef4444;
            --dark: #111827;
            --gray-900: #111827;
            --gray-800: #1f2937;
            --gray-700: #374151;
            --gray-600: #4b5563;
            --gray-500: #6b7280;
            --gray-100: #f3f4f6;
            --border: #e5e7eb;
            --shadow: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
            --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -2px rgba(0,0,0,0.05);
            --radius: 12px;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background-color: #f9fafb; color: var(--gray-800); line-height: 1.6; }
        a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
        img { max-width: 100%; height: auto; display: block; }
        li { list-style: none; }

        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

        
        .site-header { background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; transition: all 0.3s ease; }
        .header-container { display: flex; align-items: center; justify-content: space-between; height: 72px; }
        .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; line-height: 1; color: var(--gray-900); white-space: nowrap; letter-spacing: -0.5px; }
        
        .desktop-nav { display: flex; align-items: center; gap: 32px; }
        .desktop-nav a { font-size: 15px; font-weight: 500; color: var(--gray-600); }
        .desktop-nav a:hover, .desktop-nav a.active { color: var(--gray-900); }
        
        .header-actions { display: flex; align-items: center; gap: 16px; }
        .nav-btn { background: var(--gray-900); color: #fff; padding: 10px 20px; border-radius: 8px; font-size: 14px; font-weight: 600; }
        .nav-btn:hover { background: var(--gray-700); }
        
        .mobile-menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; flex-direction: column; gap: 6px; }
        .mobile-menu-toggle span { display: block; width: 24px; height: 2px; background: var(--gray-900); transition: 0.3s; }

        
        .drawer-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 998; opacity: 0; pointer-events: none; transition: all 0.3s; }
        .drawer-overlay.active { opacity: 1; pointer-events: auto; }
        .drawer-menu { position: fixed; top: 0; left: -280px; width: 280px; height: 100%; background: #fff; z-index: 999; transition: all 0.3s ease; display: flex; flex-direction: column; padding: 24px; box-shadow: var(--shadow-lg); }
        .drawer-menu.active { left: 0; }
        .drawer-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 32px; }
        .drawer-close { background: none; border: none; font-size: 28px; cursor: pointer; color: var(--gray-500); }
        .drawer-nav { display: flex; flex-direction: column; gap: 20px; }
        .drawer-nav a { font-size: 16px; font-weight: 600; color: var(--gray-700); }
        .drawer-nav a:hover { color: var(--gray-900); padding-left: 4px; }
        .drawer-footer { margin-top: auto; border-top: 1px solid var(--border); padding-top: 20px; font-size: 12px; color: var(--gray-400); }

        
        .download-hero { padding: 80px 0; background: linear-gradient(135deg, var(--primary-light) 0%, #fff 100%); text-align: center; }
        .download-hero h1 { font-size: 44px; font-weight: 800; color: var(--gray-900); margin-bottom: 20px; }
        .download-hero p { font-size: 18px; color: var(--gray-600); max-width: 600px; margin: 0 auto 40px; }

        .download-options { display: grid; grid-template-cols: repeat(3, 1fr); gap: 32px; margin-bottom: 80px; }
        .download-card { background: #fff; border-radius: 20px; padding: 40px; border: 1px solid var(--border); box-shadow: var(--shadow-lg); text-align: center; display: flex; flex-direction: column; align-items: center; justify-content: space-between; height: 380px; }
        .dl-icon { font-size: 48px; margin-bottom: 20px; }
        .download-card h2 { font-size: 24px; font-weight: 700; color: var(--gray-900); margin-bottom: 12px; }
        .download-card p { font-size: 14px; color: var(--gray-500); margin-bottom: 24px; }
        .dl-btn { background: var(--gray-900); color: #fff; width: 100%; padding: 14px 0; border-radius: 10px; font-weight: 600; font-size: 15px; }
        .dl-btn:hover { background: var(--gray-800); transform: translateY(-2px); }

        
        .guide-section { padding: 80px 0; background-color: #fff; border-top: 1px solid var(--border); }
        .guide-title { text-align: center; margin-bottom: 48px; }
        .guide-title h2 { font-size: 32px; font-weight: 800; color: var(--gray-900); }
        .steps-grid { display: grid; grid-template-cols: repeat(4, 1fr); gap: 24px; }
        .step-item { background: var(--primary-light); padding: 24px; border-radius: 16px; border: 1px solid var(--border); position: relative; }
        .step-num { font-size: 40px; font-weight: 800; color: var(--primary-dark); line-height: 1; margin-bottom: 16px; }
        .step-item h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; color: var(--gray-900); }
        .step-item p { font-size: 14px; color: var(--gray-500); }

        
        .faq-section { padding: 80px 0; background: var(--primary-light); }
        .faq-title { text-align: center; margin-bottom: 48px; }
        .faq-title h2 { font-size: 32px; font-weight: 800; }
        .faq-grid { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
        .faq-item { background: #fff; border-radius: 12px; padding: 24px; border: 1px solid var(--border); }
        .faq-question { font-size: 16px; font-weight: 700; color: var(--gray-900); margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
        .faq-question::before { content: "Q:"; color: var(--accent-red); font-size: 18px; font-weight: 800; }
        .faq-answer { font-size: 14px; color: var(--gray-600); line-height: 1.6; }

        
        .site-footer { background: var(--gray-900); color: #fff; border-top: 1px solid var(--gray-800); padding: 80px 0 32px; }
        .footer-container { display: grid; grid-template-cols: 1.2fr 0.8fr 0.8fr 1.2fr; gap: 48px; margin-bottom: 48px; }
        .footer-brand .logo { margin-bottom: 20px; }
        .footer-brand .logo span { color: #fff; }
        .brand-desc { color: var(--gray-500); font-size: 14px; line-height: 1.6; }
        .footer-link-group h4 { font-size: 16px; font-weight: 700; margin-bottom: 20px; color: #fff; }
        .footer-link-group ul { display: flex; flex-direction: column; gap: 12px; }
        .footer-link-group a { color: var(--gray-400); font-size: 14px; }
        .footer-link-group a:hover { color: #fff; }
        .footer-contact p { color: var(--gray-400); font-size: 14px; margin-bottom: 12px; }
        .footer-bottom { border-top: 1px solid var(--gray-800); padding-top: 32px; }
        .footer-bottom-container { display: flex; justify-content: space-between; align-items: center; font-size: 14px; color: var(--gray-500); }

        @media (max-width: 992px) {
            .download-options { grid-template-cols: 1fr; }
            .download-card { height: auto; padding: 32px; }
            .steps-grid { grid-template-cols: repeat(2, 1fr); }
            .footer-container { grid-template-cols: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .mobile-menu-toggle { display: flex; }
            .steps-grid { grid-template-cols: 1fr; }
            .footer-container { grid-template-cols: 1fr; gap: 32px; }
            .footer-bottom-container { flex-direction: column; gap: 16px; text-align: center; }
        }