:root {
            --primary: rgb(55,65,81);
            --primary-light: #4b5563;
            --primary-dark: #1f2937;
            --accent: #3b82f6;
            --bg-base: #f9fafb;
            --bg-surface: #ffffff;
            --text-main: #111827;
            --text-muted: #6b7280;
            --border-color: #e5e7eb;
            --radius: 8px;
            --radius-lg: 12px;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background-color: var(--bg-base); color: var(--text-main); line-height: 1.5; }
        a { color: inherit; text-decoration: none; transition: all 0.2s ease; }

        
        header { position: sticky; top: 0; z-index: 100; background-color: rgba(255, 255, 255, 0.9); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border-color); }
        .header-container { max-width: 1200px; margin: 0 auto; padding: 16px 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: 18px; font-weight: 800; line-height: 1; color: var(--primary); white-space: nowrap; }
        nav.desktop-nav { display: flex; align-items: center; gap: 28px; }
        nav.desktop-nav a { font-size: 15px; font-weight: 500; color: var(--primary); }
        nav.desktop-nav a:hover { color: var(--accent); }
        .header-actions { display: flex; align-items: center; gap: 16px; }
        .btn { display: inline-flex; align-items: center; justify-content: center; padding: 10px 20px; font-size: 14px; font-weight: 600; border-radius: var(--radius); cursor: pointer; transition: all 0.2s ease; }
        .btn-outline { border: 1px solid var(--primary); color: var(--primary); background: transparent; }
        .btn-outline:hover { background-color: rgba(55,65,81,0.05); }
        .btn-primary { background-color: var(--accent); color: #ffffff; border: none; }
        .burger-btn { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
        .burger-btn span { display: block; width: 24px; height: 2px; background-color: var(--primary); margin: 5px 0; }

        
        .drawer-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.4); opacity: 0; visibility: hidden; z-index: 199; transition: all 0.3s ease; }
        .drawer { position: fixed; top: 0; left: -300px; width: 300px; height: 100%; background-color: var(--bg-surface); z-index: 200; display: flex; flex-direction: column; transition: all 0.3s ease; }
        .drawer.active { left: 0; }
        .drawer-overlay.active { opacity: 1; visibility: visible; }
        .drawer-header { padding: 20px; border-bottom: 1px solid var(--border-color); display: flex; align-items: center; justify-content: space-between; }
        .close-btn { background: none; border: none; font-size: 24px; cursor: pointer; }
        .drawer-menu { padding: 20px; display: flex; flex-direction: column; gap: 16px; overflow-y: auto; flex: 1; }
        .drawer-menu a { font-size: 16px; font-weight: 500; padding: 8px 0; }
        .drawer-footer { padding: 20px; border-top: 1px solid var(--border-color); display: flex; flex-direction: column; gap: 12px; }

        
        .page-header { background-color: var(--primary); color: #ffffff; padding: 60px 20px; text-align: center; }
        .page-header h1 { font-size: 36px; font-weight: 800; margin-bottom: 12px; }

        
        .download-container { max-width: 1200px; margin: 60px auto; padding: 0 20px; }
        .download-intro { text-align: center; margin-bottom: 50px; }
        .download-intro h2 { font-size: 28px; color: var(--primary); margin-bottom: 16px; }
        .download-intro p { font-size: 16px; color: var(--text-muted); max-width: 700px; margin: 0 auto; }

        .platform-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; margin-top: 40px; }
        .platform-card { background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 40px; text-align: center; }
        .platform-card h3 { font-size: 24px; color: var(--primary); margin-bottom: 12px; }
        .platform-card p { font-size: 15px; color: var(--text-muted); margin-bottom: 30px; line-height: 1.6; }
        .platform-icon { font-size: 60px; margin-bottom: 20px; }
        
        .download-links { display: flex; flex-direction: column; gap: 12px; max-width: 320px; margin: 0 auto; }
        .dl-btn { display: flex; align-items: center; justify-content: center; gap: 12px; padding: 14px 20px; border-radius: 8px; font-size: 15px; font-weight: 700; cursor: pointer; transition: all 0.2s ease; }
        .dl-btn-dark { background-color: var(--primary-dark); color: #ffffff; }
        .dl-btn-dark:hover { background-color: #000000; }
        .dl-btn-blue { background-color: var(--accent); color: #ffffff; }
        .dl-btn-blue:hover { opacity: 0.9; }

        
        .guide-section { background-color: #f3f4f6; padding: 60px 20px; margin-top: 60px; border-radius: var(--radius-lg); }
        .guide-title { text-align: center; margin-bottom: 40px; font-size: 24px; color: var(--primary); font-weight: 800; }
        .guide-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .guide-step { text-align: center; }
        .guide-step-icon { width: 50px; height: 50px; border-radius: 50%; background-color: var(--primary); color: #ffffff; display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: 800; margin: 0 auto 16px auto; }
        .guide-step h4 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
        .guide-step p { font-size: 14px; color: var(--text-muted); line-height: 1.6; }

        
        footer { background-color: #111827; color: #9ca3af; padding: 80px 20px 30px 20px; border-top: 1px solid rgba(255,255,255,0.05); font-size: 14px; }
        .footer-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 40px; margin-bottom: 60px; }
        .footer-brand .logo { margin-bottom: 20px; }
        .footer-brand .logo span { color: #ffffff; }
        .footer-brand p { line-height: 1.6; margin-bottom: 20px; }
        .footer-col h5 { color: #ffffff; font-size: 16px; font-weight: 600; margin-bottom: 20px; }
        .footer-col ul { list-style: none; }
        .footer-col ul li { margin-bottom: 12px; }
        .footer-col ul li a:hover { color: #ffffff; }
        .footer-disclaimer { border-top: 1px solid rgba(255,255,255,0.05); padding-top: 30px; text-align: center; font-size: 12px; line-height: 1.8; color: #6b7280; }
        .footer-disclaimer p { max-width: 1000px; margin: 0 auto 16px auto; }

        @media (max-width: 768px) {
            nav.desktop-nav, .header-actions .btn-outline { display: none; }
            .burger-btn { display: block; }
            .platform-grid { grid-template-columns: 1fr; }
            .guide-steps { grid-template-columns: 1fr; gap: 30px; }
            .footer-container { grid-template-columns: 1fr; gap: 30px; }
        }