:root {
            --primary-color: #1D7BFF;
            --secondary-color: rgb(234,67,53);
            --dark-bg: #0A0F1D;
            --panel-bg: rgba(255, 255, 255, 0.03);
            --panel-border: rgba(255, 255, 255, 0.08);
            --text-main: #F8FAFC;
            --text-muted: #94A3B8;
            --white: #FFFFFF;
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: var(--font-sans); background-color: var(--dark-bg); color: var(--text-main); line-height: 1.6; overflow-x: hidden; }
        a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
        
        
        header { background: rgba(10, 15, 29, 0.85); backdrop-filter: blur(12px); border-bottom: 1px solid var(--panel-border); position: fixed; width: 100%; top: 0; left: 0; z-index: 1000; }
        .nav-container { max-width: 1200px; 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; }
        .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(--white); white-space: nowrap; letter-spacing: 0.5px; }
        .nav-menu { display: flex; align-items: center; gap: 32px; }
        .nav-menu a { font-size: 15px; font-weight: 500; color: var(--text-muted); }
        .nav-menu a:hover { color: var(--primary-color); }
        .nav-btn { background: var(--primary-color); color: var(--white); padding: 10px 24px; border-radius: 6px; font-weight: 600; font-size: 14px; }
        .nav-btn:hover { background: #0062E3; transform: translateY(-1px); }
        .menu-toggle { display: none; background: none; border: none; color: var(--white); font-size: 24px; cursor: pointer; }

        
        .mobile-drawer { position: fixed; top: 0; left: -100%; width: 100%; height: 100%; z-index: 2000; transition: left 0.4s cubic-bezier(0.16, 1, 0.3, 1); }
        .mobile-drawer.active { left: 0; }
        .drawer-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); }
        .drawer-content { position: absolute; top: 0; left: 0; width: 300px; height: 100%; background: #0F172A; padding: 30px 20px; display: flex; flex-direction: column; gap: 40px; box-shadow: 10px 0 30px rgba(0,0,0,0.5); }
        .drawer-header { display: flex; align-items: center; justify-content: space-between; }
        .drawer-close { background: none; border: none; color: var(--white); font-size: 28px; cursor: pointer; }
        .drawer-nav { display: flex; flex-direction: column; gap: 20px; }
        .drawer-nav a { font-size: 16px; font-weight: 500; color: var(--text-muted); padding: 8px 0; border-bottom: 1px solid rgba(255,255,255,0.05); }
        .drawer-nav a:hover { color: var(--primary-color); }

        
        .download-hero { padding: 160px 20px 80px; text-align: center; }
        .download-box { max-width: 1000px; margin: 0 auto; display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; }
        .dl-card { background: rgba(255,255,255,0.02); border: 1px solid var(--panel-border); border-radius: 20px; padding: 50px 30px; display: flex; flex-direction: column; align-items: center; justify-content: space-between; transition: all 0.3s ease; }
        .dl-card:hover { border-color: var(--primary-color); background: rgba(29, 123, 255, 0.01); transform: translateY(-5px); }
        .dl-icon { font-size: 60px; margin-bottom: 20px; }
        .dl-title { font-size: 24px; font-weight: 700; color: var(--white); margin-bottom: 15px; }
        .dl-desc { font-size: 14px; color: var(--text-muted); margin-bottom: 30px; text-align: center; }
        .dl-qr { width: 160px; height: 160px; background: var(--white); padding: 10px; border-radius: 12px; margin-bottom: 30px; display: flex; align-items: center; justify-content: center; font-size: 11px; color: #000; font-weight: bold; }
        .dl-btn { width: 100%; background: var(--primary-color); color: var(--white); padding: 14px 0; border-radius: 8px; font-weight: 700; text-align: center; display: block; }
        .dl-btn:hover { background: #0062E3; }

        
        .install-guide { max-width: 1000px; margin: 60px auto 100px; padding: 0 20px; }
        .guide-title { font-size: 24px; color: var(--white); margin-bottom: 30px; text-align: center; }
        .guide-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .step-card { background: rgba(255,255,255,0.01); border: 1px solid var(--panel-border); padding: 30px 24px; border-radius: 12px; position: relative; }
        .step-num { position: absolute; top: -20px; left: 24px; width: 40px; height: 40px; border-radius: 50%; background: var(--secondary-color); color: var(--white); display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 18px; }
        .step-card h4 { font-size: 16px; font-weight: 700; color: var(--white); margin-bottom: 12px; margin-top: 10px; }
        .step-card p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

        
        footer { background: #070B13; border-top: 1px solid var(--panel-border); padding: 80px 20px 40px; color: var(--text-muted); font-size: 14px; }
        .footer-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; margin-bottom: 60px; }
        .footer-brand { display: flex; flex-direction: column; gap: 20px; }
        .footer-brand p { font-size: 14px; line-height: 1.6; }
        .footer-title { color: var(--white); font-size: 16px; font-weight: 700; margin-bottom: 20px; }
        .footer-links { display: flex; flex-direction: column; gap: 12px; }
        .footer-links a:hover { color: var(--primary-color); }
        .footer-tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
        .footer-tag-cloud a { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.05); padding: 4px 10px; border-radius: 4px; font-size: 12px; }
        .footer-tag-cloud a:hover { background: var(--primary-color); color: var(--white); border-color: var(--primary-color); }
        .footer-bottom { max-width: 1200px; margin: 0 auto; border-top: 1px solid rgba(255,255,255,0.05); padding-top: 30px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 20px; }

        @media (max-width: 768px) {
            .nav-menu { display: none; }
            .menu-toggle { display: block; }
            .download-box, .guide-steps { grid-template-columns: 1fr; }
            .footer-inner { grid-template-columns: 1fr; gap: 30px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }