:root { --primary: #1e3a5f; --secondary: #2563eb; --accent: #f59e0b; --dark: #0f172a; --light: #f8fafc; }
        * { scroll-behavior: smooth; }
        body { font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif; background: var(--light); color: #334155; }
        .hero { background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #2563eb 100%); position: relative; overflow: hidden; }
        .hero::before { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="none" stroke="rgba(255,255,255,0.03)" stroke-width="0.5"/></svg>'); background-size: 80px 80px; animation: float 20s linear infinite; }
        @keyframes float { 0% { transform: translateY(0) rotate(0deg); } 100% { transform: translateY(-20px) rotate(360deg); } }
        .hero-particle { position: absolute; border-radius: 50%; background: rgba(255,255,255,0.1); animation: particle 15s infinite; }
        @keyframes particle { 0%, 100% { transform: translateY(0) scale(1); opacity: 0.3; } 50% { transform: translateY(-100px) scale(1.5); opacity: 0.1; } }
        .nav-glass { background: rgba(255,255,255,0.95); backdrop-filter: blur(20px); border-bottom: 1px solid rgba(0,0,0,0.05); }
        .nav-link { position: relative; transition: all 0.3s; }
        .nav-link::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--secondary); transition: width 0.3s; }
        .nav-link:hover::after { width: 100%; }
        .product-card { transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); border: 1px solid #e2e8f0; }
        .product-card:hover { transform: translateY(-8px); box-shadow: 0 20px 40px -12px rgba(0,0,0,0.15); border-color: var(--secondary); }
        .brand-card { transition: all 0.3s; background: white; border: 2px solid transparent; }
        .brand-card:hover { border-color: var(--secondary); transform: scale(1.02); box-shadow: 0 10px 30px -5px rgba(37,99,235,0.2); }
        .brand-card.active { border-color: var(--secondary); background: linear-gradient(135deg, #eff6ff, #ffffff); }
        .cat-tab { position: relative; cursor: pointer; transition: all 0.3s; }
        .cat-tab.active { color: var(--secondary); font-weight: 600; }
        .cat-tab.active::after { content: ''; position: absolute; bottom: -8px; left: 50%; transform: translateX(-50%); width: 40px; height: 3px; background: var(--secondary); border-radius: 2px; }
        .filter-btn { transition: all 0.3s; border: 1px solid #e2e8f0; }
        .filter-btn.active, .filter-btn:hover { background: var(--secondary); color: white; border-color: var(--secondary); }
        .fade-in { opacity: 0; transform: translateY(20px); animation: fadeIn 0.6s forwards; }
        @keyframes fadeIn { to { opacity: 1; transform: translateY(0); } }
        .stagger-1 { animation-delay: 0.1s; } .stagger-2 { animation-delay: 0.2s; } .stagger-3 { animation-delay: 0.3s; } .stagger-4 { animation-delay: 0.4s; }
        .stat-number { font-size: 3rem; font-weight: 700; background: linear-gradient(135deg, var(--secondary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .modal-overlay { background: rgba(15, 23, 42, 0.7); backdrop-filter: blur(8px); }
        .modal-content { animation: modalSlide 0.3s ease-out; }
        @keyframes modalSlide { from { transform: translateY(-50px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
        ::-webkit-scrollbar { width: 8px; } ::-webkit-scrollbar-track { background: #f1f5f9; } ::-webkit-scrollbar-thumb { background: #94a3b8; border-radius: 4px; } ::-webkit-scrollbar-thumb:hover { background: #64748b; }
        .highlight { background: #fef3c7; padding: 0 2px; border-radius: 2px; }
        .spec-table tr:nth-child(even) { background: #f8fafc; } .spec-table td { padding: 12px 16px; border-bottom: 1px solid #e2e8f0; } .spec-table td:first-child { font-weight: 600; color: #475569; width: 30%; }
        .solution-card { transition: all 0.3s; position: relative; overflow: hidden; }
        .solution-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: linear-gradient(135deg, rgba(37,99,235,0.9), rgba(30,58,95,0.95)); opacity: 0; transition: opacity 0.3s; }
        .solution-card:hover::before { opacity: 1; } .solution-card:hover .solution-text { color: white; } .solution-card:hover .solution-icon { color: #fbbf24; }
        .solution-inner { position: relative; z-index: 1; }
        .contact-input { transition: all 0.3s; border: 2px solid #e2e8f0; }
        .contact-input:focus { border-color: #2563eb; box-shadow: 0 0 0 3px rgba(37,99,235,0.1); outline: none; }
        .brand-logo-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 1rem; }
        .brand-logo-item { height: 80px; background: white; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-weight: bold; color: #64748b; border: 1px solid #e2e8f0; transition: all 0.3s; }
        .brand-logo-item:hover { border-color: #2563eb; color: #2563eb; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(37,99,235,0.15); }
        .feature-icon { width: 60px; height: 60px; border-radius: 16px; display: flex; align-items: center; justify-content: center; font-size: 24px; }
        .timeline-item { position: relative; padding-left: 2rem; }
        .timeline-item::before { content: ''; position: absolute; left: 0; top: 0.5rem; width: 12px; height: 12px; border-radius: 50%; background: #2563eb; border: 3px solid #dbeafe; }
        .timeline-item::after { content: ''; position: absolute; left: 5px; top: 1.5rem; width: 2px; height: calc(100% - 1rem); background: #e2e8f0; }
        .timeline-item:last-child::after { display: none; }