:root {
            --primary-color: #E1251B;
            --primary-hover: #C11F17;
            --accent-color: #FFA000;
            --bg-color: rgb(255,255,255);
            --bg-alt: #F9FAFB;
            --text-main: #1F2937;
            --text-muted: #6B7280;
            --border-color: #E5E7EB;
            --max-width: 1200px;
        }
        * { 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-color); color: var(--text-main); line-height: 1.6; }
        a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
        
        .site-header { position: sticky; top: 0; z-index: 1000; background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border-color); }
        .header-container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; height: 72px; 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-color); white-space: nowrap; }
        
        .desktop-nav { display: flex; gap: 32px; align-items: center; }
        .desktop-nav a { font-size: 15px; font-weight: 500; color: #4B5563; }
        .desktop-nav a:hover { color: var(--primary-color); }
        
        .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: 8px; transition: all 0.3s ease; cursor: pointer; }
        .btn-primary { background: linear-gradient(135deg, var(--primary-color), #FF5722); color: #fff; border: none; box-shadow: 0 4px 12px rgba(225, 37, 27, 0.2); }
        .btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(225, 37, 27, 0.3); }
        .btn-primary-outline { border: 2px solid var(--primary-color); color: var(--primary-color); background: transparent; }
        .btn-primary-outline:hover { background: var(--primary-color); color: #fff; }
        
        .drawer-toggle { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 6px; padding: 4px; }
        .drawer-toggle span { display: block; width: 24px; height: 2px; background-color: var(--text-main); transition: all 0.3s ease; }
        
        .drawer-nav { position: fixed; top: 0; left: -100%; width: 280px; height: 100vh; background: #fff; z-index: 1001; transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1); box-shadow: 4px 0 24px rgba(0,0,0,0.15); display: flex; flex-direction: column; }
        .drawer-nav.active { left: 0; }
        .drawer-header { padding: 20px; border-bottom: 1px solid var(--border-color); display: flex; align-items: center; justify-content: space-between; }
        .drawer-close { background: none; border: none; font-size: 28px; color: var(--text-muted); cursor: pointer; line-height: 1; }
        .drawer-body { padding: 20px 0; overflow-y: auto; flex: 1; }
        .drawer-menu { display: flex; flex-direction: column; }
        .drawer-menu a { padding: 14px 24px; font-size: 16px; font-weight: 500; border-bottom: 1px solid #F3F4F6; }
        .drawer-menu a:hover { background-color: var(--bg-alt); color: var(--primary-color); }
        .drawer-overlay { position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; background: rgba(0,0,0,0.4); z-index: 1000; display: none; backdrop-filter: blur(2px); }
        .drawer-overlay.active { display: block; }

        .download-hero { background: radial-gradient(circle at 90% 50%, rgba(255, 160, 0, 0.05), transparent 60%), linear-gradient(135deg, #FFF5F5 0%, #FFFFFF 100%); padding: 80px 20px; }
        .download-container { max-width: var(--max-width); margin: 0 auto; display: flex; align-items: center; gap: 60px; }
        .download-content { flex: 1; }
        .download-title { font-size: 40px; font-weight: 800; color: #111827; margin-bottom: 24px; }
        .download-title span { color: var(--primary-color); }
        .download-desc { font-size: 16px; color: var(--text-muted); margin-bottom: 40px; line-height: 1.8; }
        
        .download-options { display: flex; gap: 24px; margin-bottom: 40px; }
        .download-box { flex: 1; border: 1px solid var(--border-color); border-radius: 16px; padding: 30px; background: #fff; text-align: center; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.02); transition: all 0.3s ease; }
        .download-box:hover { transform: translateY(-3px); box-shadow: 0 12px 20px rgba(0,0,0,0.05); border-color: rgba(225, 37, 27, 0.2); }
        .platform-icon { font-size: 40px; margin-bottom: 16px; }
        .platform-name { font-size: 18px; font-weight: 700; color: #111827; margin-bottom: 8px; }
        .platform-desc { font-size: 12px; color: var(--text-muted); margin-bottom: 20px; }
        
        .download-qr-demo { width: 140px; height: 140px; background-color: #E5E7EB; margin: 0 auto; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-weight: 700; color: var(--text-muted); border: 4px solid #fff; box-shadow: 0 4px 10px rgba(0,0,0,0.08); font-size: 12px; }

        .installation-steps { padding: 80px 20px; background: var(--bg-alt); }
        .steps-container { max-width: var(--max-width); margin: 0 auto; }
        .section-header { text-align: center; max-width: 600px; margin: 0 auto 50px; }
        .section-title { font-size: 32px; font-weight: 800; color: #111827; margin-bottom: 16px; }
        .steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .step-card { background: #fff; padding: 40px 30px; border-radius: 16px; border: 1px solid var(--border-color); text-align: center; position: relative; }
        .step-badge { width: 36px; height: 36px; background: var(--primary-color); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 16px; font-weight: 800; position: absolute; top: -18px; left: 50%; transform: translateX(-50%); }
        .step-card h3 { font-size: 18px; font-weight: 700; margin: 12px 0; }
        .step-card p { font-size: 14px; color: var(--text-muted); }

        .site-footer { background: #111827; color: #9CA3AF; border-top: 1px solid #1F2937; padding: 80px 20px 40px; font-size: 14px; }
        .footer-container { max-width: var(--max-width); margin: 0 auto; display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 40px; margin-bottom: 60px; }
        .footer-brand { display: flex; flex-direction: column; gap: 20px; }
        .footer-brand .logo span { color: #fff; }
        .footer-brand p { line-height: 1.6; }
        .footer-title { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 24px; position: relative; }
        .footer-title::after { content: ''; display: block; width: 24px; height: 2px; background: var(--primary-color); margin-top: 8px; }
        .footer-links { list-style: none; display: flex; flex-direction: column; gap: 12px; }
        .footer-links a:hover { color: #fff; }
        .footer-bottom { max-width: var(--max-width); margin: 0 auto; padding-top: 40px; border-top: 1px solid #1F2937; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 20px; }
        .footer-meta-links { display: flex; gap: 24px; }

        @media (max-width: 992px) {
            .download-container { flex-direction: column; text-align: center; }
            .download-options { flex-direction: column; }
            .steps-grid { grid-template-columns: 1fr; gap: 40px; }
            .step-badge { top: -18px; }
        }
        @media (max-width: 768px) {
            .desktop-nav, .header-actions .btn-primary-outline { display: none; }
            .drawer-toggle { display: flex; }
            .footer-container { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }