:root {
            --primary-color: rgb(107, 114, 128);
            --primary-dark: #4b5563;
            --primary-light: #9ca3af;
            --accent-color: #d97706;
            --bg-color: #f3f4f6;
            --text-main: #1f2937;
            --text-muted: #6b7280;
            --card-bg: #ffffff;
            --border-color: rgba(107, 114, 128, 0.2);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', sans-serif; background-color: #111827; color: #fff; line-height: 1.6; }
        a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
        ul { list-style: none; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        
        header { background: rgba(31,41,55,0.9); backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 100; border-bottom: 1px solid rgba(255,255,255,0.1); }
        .header-inner { display: flex; justify-content: space-between; align-items: center; height: 80px; }
        .logo { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
        .logo img { display: block; height: 45px; width: auto; max-width: 180px; object-fit: contain; flex-shrink: 0; }
        .logo span { display: inline-block; font-size: 22px; font-weight: 800; color: #fff; }
        .desktop-nav { display: flex; gap: 30px; }
        .desktop-nav a { font-size: 16px; font-weight: 500; padding: 10px 0; color: #e5e7eb; position: relative; }
        .desktop-nav a:hover { color: var(--accent-color); }
        .btn-main { background: var(--accent-color); color: #fff; padding: 10px 24px; border-radius: 4px; font-weight: bold; }
        .menu-toggle { display: none; font-size: 24px; cursor: pointer; color: #fff; }
        
        .mobile-drawer { position: fixed; top: 0; left: -300px; width: 280px; height: 100%; background: #1f2937; color: #fff; z-index: 1000; transition: left 0.3s ease; padding: 20px; display: flex; flex-direction: column; }
        .mobile-drawer.active { left: 0; }
        .drawer-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 999; display: none; opacity: 0; }
        .drawer-overlay.active { display: block; opacity: 1; }
        .drawer-close { align-self: flex-end; font-size: 28px; cursor: pointer; margin-bottom: 20px; }
        .mobile-nav a { font-size: 18px; padding: 12px; border-bottom: 1px solid rgba(255,255,255,0.1); display: block; }
        .drawer-logo .logo span { color: #fff; }

        
        .download-hero { padding: 100px 0; background: radial-gradient(circle at center, #374151 0%, #111827 100%); overflow: hidden; }
        .dl-grid { display: flex; align-items: center; gap: 60px; }
        .dl-content { flex: 1; }
        .dl-content h1 { font-size: 48px; margin-bottom: 20px; line-height: 1.2; text-shadow: 0 4px 10px rgba(0,0,0,0.5); }
        .dl-content h1 span { color: var(--accent-color); }
        .dl-content p { font-size: 18px; color: #9ca3af; margin-bottom: 40px; }
        
        .dl-box { display: inline-flex; background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); border-radius: 12px; padding: 20px; gap: 30px; align-items: center; }
        .qr-placeholder { width: 120px; height: 120px; background: #fff; border-radius: 8px; padding: 10px; display: flex; flex-direction: column; align-items: center; justify-content: center; color: #000; font-size: 12px; font-weight: bold; text-align: center; border: 2px solid var(--accent-color); }
        .qr-placeholder img { width: 100%; height: 100%; object-fit: contain; margin-bottom: 5px; opacity: 0.3; }
        .dl-btns { display: flex; flex-direction: column; gap: 15px; }
        .dl-btn { display: flex; align-items: center; justify-content: center; gap: 10px; background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2); width: 200px; padding: 12px; border-radius: 6px; font-weight: bold; font-size: 16px; transition: all 0.3s; }
        .dl-btn:hover { background: var(--accent-color); border-color: var(--accent-color); transform: translateY(-2px); }

        .dl-visual { flex: 1; text-align: center; position: relative; }
        .dl-visual::after { content: ''; position: absolute; width: 300px; height: 300px; background: var(--accent-color); filter: blur(150px); top: 50%; left: 50%; transform: translate(-50%, -50%); opacity: 0.2; z-index: 0; }
        .dl-visual img { max-width: 320px; position: relative; z-index: 1; filter: drop-shadow(0 20px 30px rgba(0,0,0,0.5)); animation: float 3s ease-in-out infinite; }

        @keyframes float { 0% { transform: translateY(0); } 50% { transform: translateY(-20px); } 100% { transform: translateY(0); } }

        .dl-steps { padding: 80px 0; background: #1f2937; }
        .step-title { text-align: center; font-size: 32px; margin-bottom: 50px; }
        .step-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; text-align: center; }
        .step-item { background: rgba(0,0,0,0.2); padding: 40px 20px; border-radius: 12px; border: 1px solid rgba(255,255,255,0.05); }
        .step-num { width: 50px; height: 50px; line-height: 50px; background: var(--accent-color); color: #fff; font-size: 24px; font-weight: bold; border-radius: 50%; margin: 0 auto 20px; }
        .step-item h3 { font-size: 20px; margin-bottom: 10px; }
        .step-item p { color: #9ca3af; font-size: 14px; }

        footer { background: #0f172a; padding: 60px 0 20px; font-size: 14px; margin-top: 0; border-top: 1px solid rgba(255,255,255,0.05);}
        .footer-logo .logo span { color: #fff; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-title { color: #fff; font-size: 16px; font-weight: bold; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 2px solid var(--accent-color); display: inline-block; }
        .footer-links li { margin-bottom: 10px; }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center; color: #9ca3af;}
        .footer-extra-links a { margin: 0 10px; color: #6b7280; }

        @media (max-width: 992px) {
            .desktop-nav { display: none; }
            .menu-toggle { display: block; }
            .dl-grid { flex-direction: column; text-align: center; }
            .dl-box { flex-direction: column; }
            .step-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr; }
        }