:root { --theme-color: rgb(0,0,0); --bg-base: #050505; --bg-card: #121212; --text-main: #ffffff; --text-sub: #a0a0a0; --accent-color: #d4af37; --border-color: #222222; --radius: 8px; --transition: all 0.3s ease; }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background-color: var(--bg-base); color: var(--text-main); line-height: 1.6; }
        a { text-decoration: none; color: inherit; }
        ul { list-style: none; }
        img { max-width: 100%; height: auto; display: block; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        
        .header { position: sticky; top: 0; width: 100%; z-index: 100; background: rgba(5,5,5,0.85); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border-color); }
        .header-inner { display: flex; justify-content: space-between; align-items: center; height: 70px; }
        .logo { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
        .logo img { display: block; height: 36px; 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(--text-main); white-space: nowrap; }
        .nav-desktop { display: flex; gap: 30px; align-items: center; }
        .nav-desktop a { font-size: 15px; font-weight: 500; color: var(--text-sub); transition: var(--transition); }
        .nav-desktop a:hover { color: var(--accent-color); }
        .menu-btn { display: none; background: none; border: none; color: var(--text-main); font-size: 24px; cursor: pointer; }
        
        .drawer-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.7); z-index: 998; opacity: 0; visibility: hidden; transition: var(--transition); }
        .drawer-overlay.active { opacity: 1; visibility: visible; }
        .drawer { position: fixed; top: 0; left: -300px; width: 280px; height: 100%; background: var(--bg-card); z-index: 999; box-shadow: 4px 0 20px rgba(0,0,0,0.5); transition: var(--transition); overflow-y: auto; display: flex; flex-direction: column; }
        .drawer.active { left: 0; }
        .drawer-header { padding: 20px; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
        .drawer-close { background: none; border: none; color: var(--text-sub); font-size: 28px; cursor: pointer; }
        .drawer-nav { padding: 20px 0; }
        .drawer-nav a { display: block; padding: 12px 20px; border-bottom: 1px solid rgba(255,255,255,0.05); }

        .footer { background: var(--theme-color); border-top: 1px solid var(--border-color); padding: 80px 0 30px; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 50px; margin-bottom: 50px; }
        .footer-desc { color: var(--text-sub); font-size: 14px; margin-top:20px; }
        .footer-title { font-size: 16px; font-weight: 600; margin-bottom: 25px; color: #fff; }
        .footer-links { display: flex; flex-direction: column; gap: 12px; }
        .footer-links a { color: var(--text-sub); font-size: 14px; }
        .footer-links a:hover { color: var(--accent-color); }
        .footer-bottom { border-top: 1px solid var(--border-color); padding-top: 30px; display: flex; justify-content: space-between; color: #666; font-size: 13px; }

        
        .dl-hero { display: flex; align-items: center; min-height: 80vh; padding: 60px 0; background: radial-gradient(circle at right center, #1a1a1a 0%, var(--bg-base) 60%); }
        .dl-content { flex: 1; padding-right: 50px; }
        .dl-title { font-size: 42px; font-weight: 800; margin-bottom: 20px; line-height: 1.2; }
        .dl-title span { color: var(--accent-color); }
        .dl-desc { font-size: 18px; color: var(--text-sub); margin-bottom: 40px; }
        .dl-btns { display: flex; gap: 20px; margin-bottom: 40px; flex-wrap: wrap; }
        .btn-dl { display: inline-flex; align-items: center; gap: 15px; padding: 15px 30px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 50px; transition: var(--transition); min-width: 220px; }
        .btn-dl:hover { background: rgba(212,175,55,0.1); border-color: var(--accent-color); transform: translateY(-3px); }
        .btn-dl.primary { background: var(--accent-color); color: #000; border-color: var(--accent-color); }
        .btn-dl.primary:hover { background: #f0c950; box-shadow: 0 10px 20px rgba(212,175,55,0.3); }
        .dl-icon { font-size: 28px; }
        .dl-info { display: flex; flex-direction: column; }
        .dl-info strong { font-size: 16px; font-weight: 700; line-height: 1.2; }
        .dl-info span { font-size: 12px; opacity: 0.8; }
        .dl-visual { flex: 1; display: flex; justify-content: center; position: relative; }
        .phone-mockup { width: 300px; height: 600px; background: #000; border: 12px solid #333; border-radius: 40px; position: relative; overflow: hidden; box-shadow: -20px 20px 60px rgba(0,0,0,0.8); z-index: 2; }
        .phone-screen { width: 100%; height: 100%; background: url('https://images.unsplash.com/photo-1614680376593-902f74cf0d41?auto=format&fit=crop&w=400&q=80') center/cover; position: relative; }
        .phone-screen::after { content: '凤凰彩票网 App'; position: absolute; top: 50%; left: 0; width: 100%; text-align: center; font-size: 24px; font-weight: bold; background: rgba(0,0,0,0.6); padding: 10px 0; }
        .circle-blur { position: absolute; width: 400px; height: 400px; background: rgba(212,175,55,0.15); filter: blur(80px); border-radius: 50%; top: 50%; left: 50%; transform: translate(-50%, -50%); z-index: 1; }

        .steps-section { padding: 80px 0; border-top: 1px solid var(--border-color); background: var(--bg-card); }
        .steps-title { text-align: center; font-size: 28px; margin-bottom: 50px; }
        .steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .step-card { text-align: center; padding: 30px; position: relative; }
        .step-num { width: 40px; height: 40px; background: var(--accent-color); color: #000; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: bold; margin: 0 auto 20px; }
        .step-card h4 { font-size: 18px; margin-bottom: 10px; }
        .step-card p { color: var(--text-sub); font-size: 14px; }

        @media (max-width: 992px) {
            .dl-hero { flex-direction: column; text-align: center; padding: 40px 0; }
            .dl-content { padding-right: 0; margin-bottom: 50px; }
            .dl-btns { justify-content: center; }
            .steps-grid { grid-template-columns: 1fr; }
        }
        @media (max-width: 768px) {
            .nav-desktop { display: none; } .menu-btn { display: block; }
            .footer-grid { grid-template-columns: 1fr; gap: 30px; }
            .footer-bottom { flex-direction: column; text-align: center; gap: 15px; }
            .dl-title { font-size: 32px; }
            .phone-mockup { width: 260px; height: 520px; }
        }