:root { --primary-bg: #0d0e15; --surface: rgb(40,42,54); --surface-hover: #363948; --accent: #d4af37; --text-main: #ffffff; --text-muted: #9aa0a6; --border: rgba(255, 255, 255, 0.1); --radius: 8px; --transition: all 0.3s ease; }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'PingFang SC', sans-serif; background-color: var(--primary-bg); color: var(--text-main); line-height: 1.6; }
        a { color: var(--text-main); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--accent); }
        img { max-width: 100%; display: block; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        .header { background-color: var(--surface); position: sticky; top: 0; z-index: 1000; box-shadow: 0 4px 20px rgba(0,0,0,0.5); }
        .header-inner { display: flex; align-items: center; justify-content: space-between; height: 80px; }
        .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; }
        .logo span { display: inline-block; font-size: 20px; font-weight: 800; color: var(--accent); }
        .desktop-nav { display: flex; gap: 30px; }
        .desktop-nav a { font-size: 16px; font-weight: 500; position: relative; }
        .desktop-nav a::after { content: ''; position: absolute; bottom: -5px; left: 0; width: 0; height: 2px; background: var(--accent); transition: var(--transition); }
        .desktop-nav a:hover::after { width: 100%; }
        .header-actions { display: flex; align-items: center; gap: 15px; }
        .btn { display: inline-flex; padding: 10px 24px; border-radius: 4px; font-weight: 600; cursor: pointer; transition: var(--transition); border: none; align-items: center; gap: 8px; }
        .btn-primary { background: linear-gradient(135deg, #d4af37, #f1c40f); color: #111; }
        .btn-primary:hover { transform: translateY(-2px); color: #000; box-shadow: 0 6px 20px rgba(212, 175, 55, 0.4); }
        .menu-toggle { display: none; background: transparent; border: none; color: var(--text-main); font-size: 28px; cursor: pointer; }

        .drawer-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.7); z-index: 1001; opacity: 0; visibility: hidden; }
        .drawer-overlay.active { opacity: 1; visibility: visible; }
        .mobile-drawer { position: fixed; top: 0; left: -300px; width: 280px; height: 100%; background-color: var(--surface); z-index: 1002; transition: var(--transition); display: flex; flex-direction: column; }
        .mobile-drawer.active { left: 0; }
        .drawer-header { padding: 20px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }
        .drawer-close { background: transparent; border: none; color: var(--text-muted); font-size: 24px; }
        .drawer-nav { padding: 20px; overflow-y: auto; }
        .drawer-nav a { display: block; padding: 15px 0; border-bottom: 1px solid var(--border); }

        
        .download-hero { padding: 100px 0; background: radial-gradient(circle at center, var(--surface) 0%, var(--primary-bg) 100%); overflow: hidden; border-bottom: 1px solid var(--border); }
        .dl-container { display: flex; align-items: center; justify-content: space-between; gap: 50px; }
        .dl-content { flex: 1; max-width: 550px; }
        .dl-title { font-size: 42px; margin-bottom: 20px; color: var(--text-main); font-weight: 800; line-height: 1.2; }
        .dl-title span { color: var(--accent); }
        .dl-desc { font-size: 16px; color: var(--text-muted); margin-bottom: 40px; }
        .dl-buttons { display: flex; gap: 20px; margin-bottom: 40px; }
        .btn-dl { padding: 15px 30px; font-size: 18px; display: inline-flex; flex-direction: column; align-items: center; line-height: 1.2; background: var(--surface-hover); border: 1px solid var(--border); color: #fff; border-radius: var(--radius); }
        .btn-dl:hover { background: var(--accent); border-color: var(--accent); color: #111; }
        .btn-dl span { font-size: 12px; opacity: 0.8; margin-top: 5px; }
        .qr-box { display: flex; align-items: center; gap: 20px; background: rgba(0,0,0,0.3); padding: 20px; border-radius: var(--radius); border: 1px solid var(--border); }
        .qr-placeholder { width: 100px; height: 100px; background: #fff; padding: 10px; border-radius: 4px; }
        
        .dl-visual { flex: 1; display: flex; justify-content: center; position: relative; }
        .dl-visual img { max-height: 600px; filter: drop-shadow(0 20px 40px rgba(0,0,0,0.8)); }

        .dl-steps { padding: 80px 0; background-color: var(--primary-bg); }
        .step-header { text-align: center; margin-bottom: 50px; }
        .step-header h2 { font-size: 32px; color: var(--accent); margin-bottom: 10px; }
        .steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .step-card { background: var(--surface); padding: 40px 30px; border-radius: var(--radius); text-align: center; border: 1px solid var(--border); }
        .step-num { width: 50px; height: 50px; margin: 0 auto 20px; background: var(--accent); color: #111; font-size: 24px; font-weight: bold; display: flex; align-items: center; justify-content: center; border-radius: 50%; }
        .step-card h3 { font-size: 20px; margin-bottom: 15px; }
        .step-card p { color: var(--text-muted); font-size: 14px; }

        .footer { background-color: #08090d; padding: 60px 0 20px; border-top: 1px solid var(--border); }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-brand .logo { margin-bottom: 20px; }
        .footer-desc { color: var(--text-muted); font-size: 14px; margin-bottom: 20px; max-width: 300px; }
        .footer-title { font-size: 18px; font-weight: 600; margin-bottom: 20px; color: #fff; padding-bottom: 10px; border-bottom: 2px solid var(--accent); display: inline-block;}
        .footer-links li { margin-bottom: 12px; }
        .footer-links a { color: var(--text-muted); font-size: 14px; }
        .footer-bottom { border-top: 1px solid var(--border); padding-top: 20px; text-align: center; color: var(--text-muted); font-size: 14px; display:flex; justify-content: space-between;}

        @media (max-width: 1024px) {
            .dl-container { flex-direction: column; text-align: center; }
            .qr-box { justify-content: center; }
            .dl-buttons { justify-content: center; }
            .steps-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .desktop-nav, .header-actions .btn { display: none; }
            .menu-toggle { display: block; }
            .dl-title { font-size: 32px; }
            .footer-grid { grid-template-columns: 1fr; }
            .dl-buttons { flex-direction: column; }
        }