:root {
            --primary-color: #2563eb;
            --primary-light: #60a5fa;
            --accent-color: #06b6d4;
            --gradient-text: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
            --hero-bg-light: #eff4f8;
            --hero-bg-dark: #0f172a;
            --glass-bg-light: #ffffff;
            --glass-bg-dark: rgba(15, 17, 42, 0.7);
            --glass-border-light: rgba(255, 255, 255, 0.6);
            --glass-border-dark: rgba(255, 255, 255, 0.1);
        }

        html { scroll-padding-top: 70px; }
        body { font-family: 'Inter', 'Noto Sans SC', sans-serif; overflow-x: hidden; }

        /* --- 动画 --- */
        .reveal { opacity: 0; transform: translateY(30px); transition: all 0.8s cubic-bezier(0.5, 0, 0, 1); }
        .reveal.active { opacity: 1; transform: translateY(0); }
        .fade-in-up { animation: fadeInUp 0.5s ease-out forwards; }
        @keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
        .float-anim { animation: float 6s ease-in-out infinite; }
        .float-anim-delay { animation: float 7s ease-in-out infinite; animation-delay: 1s; }
        @keyframes float { 0% { transform: translateY(0px); } 50% { transform: translateY(-20px); } 100% { transform: translateY(0px); } }

        /* --- 导航栏 --- */
        .navbar {
            backdrop-filter: blur(12px);
            background-color: rgba(255,255,255,0.9) !important;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            padding: 0.6rem 0; 
            transition: all 0.3s ease;
            box-shadow: 0 4px 24px rgba(0,0,0,0.06);
        }
        [data-bs-theme="dark"] .navbar {
            background-color: rgba(15, 23, 42, 0.85) !important;
            border-bottom: 1px solid rgba(255,255,255,0.05);
            box-shadow: 0 4px 24px rgba(0,0,0,0.4);
        }
        .nav-link { font-weight: 500; margin: 0 5px; position: relative; color: var(--bs-body-color); }
        .nav-link::after { content: ''; position: absolute; width: 0; height: 2px; bottom: 0; left: 50%; background: var(--primary-color); transition: all 0.3s; transform: translateX(-50%); }
        .nav-link:hover::after, .nav-link.active::after { width: 80%; }
        .nav-link.active { color: var(--primary-color) !important; }

        /* --- Hero Section --- */
        .hero-section {
            background-color: var(--hero-bg-light);
            background-image: 
                radial-gradient(at 100% 0%, rgba(37, 99, 235, 0.05) 0px, transparent 50%),
                radial-gradient(at 0% 100%, rgba(6, 182, 212, 0.05) 0px, transparent 50%),
                radial-gradient(#cbd5e1 1px, transparent 1px);
            background-size: 100% 100%, 100% 100%, 40px 40px;
            /* 修复：增加底部 padding，给 Stats Strip 留出悬浮空间 */
            padding: 100px 0 140px; 
            position: relative;
            overflow: hidden;
            z-index: 1;
        }
        [data-bs-theme="dark"] .hero-section {
            background-color: var(--hero-bg-dark);
            background-image: 
                radial-gradient(at 100% 0%, rgba(37, 99, 235, 0.15) 0px, transparent 50%),
                radial-gradient(at 0% 100%, rgba(6, 182, 212, 0.15) 0px, transparent 50%),
                radial-gradient(#334155 1px, transparent 1px);
        }

        .particles-bg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 0; opacity: 0.6; pointer-events: none; }
        .particle {
            position: absolute; background: var(--primary-color); border-radius: 50%; opacity: 0.3;
            animation: floatParticle 10s infinite linear;
        }
        @keyframes floatParticle {
            0% { transform: translateY(0) translateX(0); opacity: 0; }
            50% { opacity: 0.5; }
            100% { transform: translateY(-100vh) translateX(50px); opacity: 0; }
        }

        .text-gradient {
            background: var(--gradient-text);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* Hero UI Cards */
        .hero-ui-group { position: relative; height: 420px; width: 100%; }
        .ui-card {
            position: absolute;
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-radius: 20px; 
            box-shadow: 0 20px 50px rgba(0,0,0,0.12), 0 5px 15px rgba(0,0,0,0.05);
            padding: 18px; z-index: 2; transition: transform 0.4s ease;
        }
        .ui-card:hover { transform: translateY(-5px) scale(1.02); z-index: 10; }

        .ui-card-sub-1 { 
            top: 5%; right: -15px; width: 230px; z-index: 5; 
            background: linear-gradient(145deg, rgba(255,255,255,0.95) 20%, rgba(206, 245, 255, 0.85) 100%);
            border: 1px solid rgba(6, 182, 212, 0.15);
        }
        .ui-card-sub-2 { 
            bottom: 0%; left: 40%; width: 240px; z-index: 6; 
            background: linear-gradient(145deg, rgba(255,255,255,0.95) 20%, rgba(255, 247, 210, 0.85) 100%);
            border: 1px solid rgba(245, 158, 11, 0.15);
        }
        .ui-card-sub-3 { 
            top: 40%; left: -15px; width: 210px; z-index: 4; 
            background: linear-gradient(145deg, rgba(255,255,255,0.95) 20%, rgba(219, 234, 254, 0.85) 100%);
            border: 1px solid rgba(59, 130, 246, 0.15);
        }

        [data-bs-theme="dark"] .ui-card { box-shadow: 0 20px 50px rgba(0,0,0,0.4); }
        [data-bs-theme="dark"] .ui-card-sub-1 { background: linear-gradient(145deg, rgba(30, 41, 59, 0.85) 0%, rgba(21, 94, 117, 0.5) 100%); border-color: rgba(6, 182, 212, 0.2); }
        [data-bs-theme="dark"] .ui-card-sub-2 { background: linear-gradient(145deg, rgba(30, 41, 59, 0.85) 0%, rgba(120, 53, 15, 0.4) 100%); border-color: rgba(245, 158, 11, 0.2); }
        [data-bs-theme="dark"] .ui-card-sub-3 { background: linear-gradient(145deg, rgba(30, 41, 59, 0.85) 0%, rgba(30, 58, 138, 0.5) 100%); border-color: rgba(59, 130, 246, 0.2); }

        /* --- Stats Strip (Optimized & Fixed Z-Index) --- */
        .stats-strip {
            background: rgba(255, 255, 255, 0.95); 
            backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.5); border-radius: 20px; 
            box-shadow: 0 20px 40px rgba(0,0,0,0.1); padding: 10px; 
            /* 修复：向上拉动，覆盖 Hero 和 Advantage 的交界处 */
            margin-top: -100px; 
            position: relative; 
            z-index: 50; /* 极高层级，防止被遮挡 */
        }
        [data-bs-theme="dark"] .stats-strip { 
            background: rgba(30, 41, 59, 0.95); border-color: rgba(255,255,255,0.05);
            box-shadow: 0 20px 40px rgba(0,0,0,0.3); color: white;
        }
        .stat-item {
            border-radius: 16px; padding: 15px 10px; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            border: 1px solid transparent; height: 100%;
            display: flex; align-items: center; justify-content: center;
        }
        .stat-item:hover { background: #ffffff; box-shadow: 0 10px 25px rgba(0,0,0,0.06); transform: translateY(-3px); border-color: rgba(0,0,0,0.03); }
        [data-bs-theme="dark"] .stat-item:hover { background: rgba(255,255,255,0.05); border-color: rgba(255,255,255,0.05); }
        
        .stat-icon-wrapper {
            width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
            font-size: 1.6rem; margin-right: 15px; flex-shrink: 0; transition: all 0.3s ease; position: relative; overflow: hidden;
        }
        .stat-icon-wrapper::after { content: ''; position: absolute; inset: 0; opacity: 0.15; z-index: 0; background: currentColor; }
        .stat-icon-wrapper i { position: relative; z-index: 1; }
        .stat-color-primary { color: #2563eb; } .stat-color-info { color: #06b6d4; }
        .stat-color-success { color: #10b981; } .stat-color-warning { color: #f59e0b; }
        .stat-item:hover .stat-icon-wrapper { transform: scale(1.1) rotate(-5deg); }
        .stat-value {
            font-size: 1.75rem; font-weight: 800; line-height: 1.1; letter-spacing: -0.5px; margin-bottom: 2px;
            background: linear-gradient(135deg, #1e293b 0%, #475569 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
        }
        [data-bs-theme="dark"] .stat-value { background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .stat-label { font-size: 0.8rem; color: #64748b; font-weight: 600; white-space: nowrap; }
        [data-bs-theme="dark"] .stat-label { color: #94a3b8; }

        /* --- Advantage Section (Dual Panel) --- */
        .advantage-section { 
            /* 修复：使用负 Margin 向上提拉，消除白色间隙 */
            margin-top: -60px; 
            padding: 80px 0 80px; 
            background-color: var(--hero-bg-light); /* 背景色与 Hero 一致 */
            position: relative; 
            z-index: 5; /* 低于 Stats Strip */
        }
        [data-bs-theme="dark"] .advantage-section { background-color: var(--hero-bg-dark); }
        
        .feature-panel {
            background: #ffffff; border-radius: 32px; box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.8); overflow: hidden; display: flex; flex-direction: column; min-height: 550px;
        }
        [data-bs-theme="dark"] .feature-panel { background: rgba(30, 41, 59, 0.6); border-color: rgba(255, 255, 255, 0.05); }
        @media(min-width: 992px) { .feature-panel { flex-direction: row; } }
        .feature-sidebar {
            background: linear-gradient(180deg, #eff6ff 0%, #f8fafc 100%);
            padding: 30px 20px; border-right: 1px solid rgba(0,0,0,0.04);
            flex: 0 0 320px; display: flex; flex-direction: column; justify-content: center;
        }
        [data-bs-theme="dark"] .feature-sidebar { background: linear-gradient(180deg, rgba(30, 41, 59, 0.7) 0%, rgba(15, 23, 42, 0.8) 100%); border-right-color: rgba(255,255,255,0.05); }
        .feature-nav-btn {
            width: 100%; text-align: left; padding: 16px 20px; margin-bottom: 10px;
            border-radius: 16px; border: 1px solid transparent; background: transparent;
            color: #64748b; font-weight: 600; transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
            display: flex; align-items: center; justify-content: space-between; cursor: pointer; opacity: 0.8; font-size: 0.95rem;
        }
        [data-bs-theme="dark"] .feature-nav-btn { color: #94a3b8; }
        .feature-nav-btn:hover { background: rgba(255,255,255,0.8); opacity: 1; transform: translateX(4px); }
        [data-bs-theme="dark"] .feature-nav-btn:hover { background: rgba(255,255,255,0.05); }
        
        .feature-nav-lang.active { background: #ecfeff; color: #0891b2; border-color: rgba(8, 145, 178, 0.1); }
        .feature-nav-chain.active { background: #eff6ff; color: #2563eb; border-color: rgba(37, 99, 235, 0.1); }
        .feature-nav-cashier.active { background: #ecfdf5; color: #059669; border-color: rgba(5, 150, 105, 0.1); }
        .feature-nav-app.active { background: #f5f3ff; color: #7c3aed; border-color: rgba(124, 58, 237, 0.1); }
        .feature-nav-print.active { background: #fdf2f8; color: #db2777; border-color: rgba(219, 39, 119, 0.1); }

        [data-bs-theme="dark"] .feature-nav-lang.active { background: rgba(8, 145, 178, 0.2); color: #22d3ee; border-color: transparent; }
        [data-bs-theme="dark"] .feature-nav-chain.active { background: rgba(37, 99, 235, 0.2); color: #60a5fa; border-color: transparent; }
        [data-bs-theme="dark"] .feature-nav-cashier.active { background: rgba(5, 150, 105, 0.2); color: #34d399; border-color: transparent; }
        [data-bs-theme="dark"] .feature-nav-app.active { background: rgba(124, 58, 237, 0.2); color: #a78bfa; border-color: transparent; }
        [data-bs-theme="dark"] .feature-nav-print.active { background: rgba(219, 39, 119, 0.2); color: #f472b6; border-color: transparent; }

        .feature-nav-btn.active { box-shadow: 0 8px 20px -4px rgba(0,0,0,0.05); opacity: 1; transform: translateX(8px); }
        .feature-nav-icon {
            width: 36px; height: 36px; border-radius: 10px; background: rgba(0,0,0,0.04);
            display: flex; align-items: center; justify-content: center; margin-right: 15px; font-size: 1.1rem;
            transition: 0.3s;
        }
        [data-bs-theme="dark"] .feature-nav-icon { background: rgba(255,255,255,0.05); }

        .feature-nav-lang.active .feature-nav-icon { background: #0891b2; color: white; box-shadow: 0 4px 10px rgba(8, 145, 178, 0.3); }
        .feature-nav-chain.active .feature-nav-icon { background: #2563eb; color: white; box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3); }
        .feature-nav-cashier.active .feature-nav-icon { background: #059669; color: white; box-shadow: 0 4px 10px rgba(5, 150, 105, 0.3); }
        .feature-nav-app.active .feature-nav-icon { background: #7c3aed; color: white; box-shadow: 0 4px 10px rgba(124, 58, 237, 0.3); }
        .feature-nav-print.active .feature-nav-icon { background: #db2777; color: white; box-shadow: 0 4px 10px rgba(219, 39, 119, 0.3); }
        
        [data-bs-theme="dark"] .feature-nav-lang.active .feature-nav-icon { background: rgba(8, 145, 178, 0.3); color: #22d3ee; box-shadow: none; }
        [data-bs-theme="dark"] .feature-nav-chain.active .feature-nav-icon { background: rgba(37, 99, 235, 0.3); color: #60a5fa; box-shadow: none; }
        [data-bs-theme="dark"] .feature-nav-cashier.active .feature-nav-icon { background: rgba(5, 150, 105, 0.3); color: #34d399; box-shadow: none; }
        [data-bs-theme="dark"] .feature-nav-app.active .feature-nav-icon { background: rgba(124, 58, 237, 0.3); color: #a78bfa; box-shadow: none; }
        [data-bs-theme="dark"] .feature-nav-print.active .feature-nav-icon { background: rgba(219, 39, 119, 0.3); color: #f472b6; box-shadow: none; }

        .feature-content-area { 
            flex: 1; padding: 50px; position: relative; background: #ffffff; display: flex; align-items: center; min-width: 0;
        }
        [data-bs-theme="dark"] .feature-content-area { background: transparent; }

        .feature-content-wrapper { width: 100%; animation: fadeInUp 0.5s ease-out forwards; }
        .feature-title-group { margin-bottom: 25px; }
        .feature-title { font-size: 2rem; font-weight: 800; margin-bottom: 15px; letter-spacing: -0.5px; }
        .feature-desc { font-size: 1.1rem; color: #64748b; line-height: 1.6; margin-bottom: 30px; }
        [data-bs-theme="dark"] .feature-desc { color: #94a3b8; }
        .feature-detail-list { padding: 0; list-style: none; display: grid; gap: 15px; }
        .feature-detail-list li {
            background: #f8fafc; padding: 15px 20px; border-radius: 12px; display: flex; align-items: flex-start;
            font-size: 0.95rem; color: #334155; transition: 0.3s;
        }
        [data-bs-theme="dark"] .feature-detail-list li { background: rgba(255,255,255,0.03); color: #cbd5e1; }
        .feature-detail-list li:hover { background: #f1f5f9; transform: translateX(5px); }
        [data-bs-theme="dark"] .feature-detail-list li:hover { background: rgba(255,255,255,0.06); }
        .check-icon-circle {
            width: 22px; height: 22px; background: #dcfce7; color: #16a34a; border-radius: 50%;
            display: flex; align-items: center; justify-content: center; font-size: 0.75rem; margin-right: 15px; margin-top: 2px; flex-shrink: 0;
        }
        .feature-mockup {
            background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%); border-radius: 24px;
            height: 100%; min-height: 360px; position: relative; overflow: hidden;
            display: flex; align-items: center; justify-content: center; border: 4px solid #fff; box-shadow: 0 20px 40px -10px rgba(0,0,0,0.1);
        }
        [data-bs-theme="dark"] .feature-mockup { background: #1e293b; border-color: #334155; }
        .ui-abstract-card {
            background: white; border-radius: 12px; padding: 15px; width: 80%;
            box-shadow: 0 10px 25px rgba(0,0,0,0.05); position: absolute; transition: 0.5s ease-out;
        }
        .ui-row { height: 8px; background: #f1f5f9; border-radius: 4px; margin-bottom: 8px; }
        .ui-row.short { width: 60%; } .ui-row.long { width: 90%; }
        .ui-circle { width: 40px; height: 40px; border-radius: 50%; background: #e2e8f0; margin-bottom: 10px; }
        .mockup-lang .card-top { top: 20%; left: 50%; transform: translateX(-50%); width: 70%; z-index: 1; }
        .mockup-lang .card-bottom { top: 45%; left: 50%; transform: translateX(-50%) scale(1.1); width: 75%; z-index: 2; box-shadow: 0 20px 40px rgba(8, 145, 178, 0.15); }
        .mockup-lang .flag-icon { width: 30px; height: 20px; background: #cbd5e1; border-radius: 4px; display: inline-block; margin-right: 10px; }
        .mockup-lang .currency { font-weight: bold; color: #0891b2; font-size: 1.2rem; float: right; }
        .mockup-chain .center-node { 
            width: 60px; height: 60px; background: #2563eb; border-radius: 50%; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); z-index: 2;
            box-shadow: 0 0 0 10px rgba(37, 99, 235, 0.1); display: flex; align-items: center; justify-content: center; color: white; font-size: 1.5rem;
        }
        .mockup-chain .sub-node {
            width: 40px; height: 40px; background: white; border-radius: 50%; position: absolute; display: flex; align-items: center; justify-content: center; color: #2563eb;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .mockup-chain .node-1 { top: 20%; left: 20%; animation: float 4s infinite; }
        .mockup-chain .node-2 { bottom: 20%; left: 20%; animation: float 5s infinite 1s; }
        .mockup-chain .node-3 { top: 50%; right: 15%; transform: translateY(-50%); animation: float 6s infinite 0.5s; }
        .mockup-chain .line { position: absolute; background: #cbd5e1; height: 2px; transform-origin: left center; z-index: 1; }
        .mockup-cashier .screen {
            width: 85%; height: 70%; background: white; border-radius: 8px; position: absolute; top: 15%; left: 50%; transform: translateX(-50%);
            display: flex; overflow: hidden; box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }
        .mockup-cashier .left-panel { flex: 2; padding: 10px; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; background: #f8fafc; }
        .mockup-cashier .right-panel { flex: 1; padding: 10px; border-left: 1px solid #e2e8f0; }
        .mockup-cashier .product-btn { height: 40px; border-radius: 6px; background: white; border: 1px solid #e2e8f0; }
        .mockup-cashier .product-btn:nth-child(1) { background: #ecfdf5; border-color: #a7f3d0; }
        .mockup-app .phone {
            width: 140px; height: 280px; background: white; border: 4px solid #1e293b; border-radius: 20px; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); overflow: hidden;
        }
        .mockup-app .app-header { height: 40px; background: #7c3aed; }
        .mockup-app .app-item { height: 50px; border-bottom: 1px solid #f1f5f9; display: flex; align-items: center; padding: 0 10px; }
        .mockup-app .app-img { width: 30px; height: 30px; background: #ddd; border-radius: 4px; margin-right: 8px; }
        .mockup-print .paper {
            width: 160px; height: 240px; background: white; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1); padding: 20px;
            background-image: radial-gradient(#e2e8f0 20%, transparent 20%); background-position: 0 0; background-size: 10px 10px;
            clip-path: polygon(0 0, 100% 0, 100% 100%, 95% 98%, 90% 100%, 85% 98%, 80% 100%, 75% 98%, 70% 100%, 65% 98%, 60% 100%, 55% 98%, 50% 100%, 45% 98%, 40% 100%, 35% 98%, 30% 100%, 25% 98%, 20% 100%, 15% 98%, 10% 100%, 5% 98%, 0 100%);
        }
        .mockup-print .line { height: 6px; background: #e2e8f0; margin-bottom: 10px; width: 100%; border-radius: 2px; }
        .mockup-print .line.bold { height: 10px; background: #db2777; width: 60%; margin-bottom: 20px; }

        /* --- Map Section --- */
        .map-section { position: relative; background-color: #0f172a; color: white; padding: 40px 0; overflow: hidden; }
        .map-bg {
            position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 80%; height: 80%;
            background-image: radial-gradient(#334155 2px, transparent 2px); background-size: 20px 20px; opacity: 0.3;
            mask-image: radial-gradient(circle, black 40%, transparent 80%);
        }
        .map-dot { position: absolute; width: 12px; height: 12px; background-color: var(--accent-color); border-radius: 50%; box-shadow: 0 0 15px var(--accent-color); }
        .map-dot::after {
            content: ''; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
            width: 30px; height: 30px; border: 1px solid var(--accent-color); border-radius: 50%; animation: ripple 2s infinite;
        }
        @keyframes ripple { 0% { width: 10px; height: 10px; opacity: 0.8; } 100% { width: 50px; height: 50px; opacity: 0; } }

        /* --- Feature Card Premium --- */
        .card-theme-primary { --card-bg-tint: rgba(13, 110, 253, 0.12); --card-border-tint: rgba(13, 110, 253, 0.2); --icon-bg: rgba(13, 110, 253, 0.1); --icon-color: #0d6efd; }
        .card-theme-success { --card-bg-tint: rgba(25, 135, 84, 0.12); --card-border-tint: rgba(25, 135, 84, 0.2); --icon-bg: rgba(25, 135, 84, 0.1); --icon-color: #198754; }
        .card-theme-info    { --card-bg-tint: rgba(13, 202, 240, 0.12); --card-border-tint: rgba(13, 202, 240, 0.2); --icon-bg: rgba(13, 202, 240, 0.1); --icon-color: #0dcaf0; }
        .card-theme-warning { --card-bg-tint: rgba(255, 193, 7, 0.12); --card-border-tint: rgba(255, 193, 7, 0.2); --icon-bg: rgba(255, 193, 7, 0.1); --icon-color: #ffc107; }
        .card-theme-danger  { --card-bg-tint: rgba(220, 53, 69, 0.12); --card-border-tint: rgba(220, 53, 69, 0.2); --icon-bg: rgba(220, 53, 69, 0.1); --icon-color: #dc3545; }
        .card-theme-purple  { --card-bg-tint: rgba(111, 66, 193, 0.12); --card-border-tint: rgba(111, 66, 193, 0.2); --icon-bg: rgba(111, 66, 193, 0.1); --icon-color: #6f42c1; }
        .card-theme-teal    { --card-bg-tint: rgba(32, 201, 151, 0.12); --card-border-tint: rgba(32, 201, 151, 0.2); --icon-bg: rgba(32, 201, 151, 0.1); --icon-color: #20c997; }
        .card-theme-indigo  { --card-bg-tint: rgba(102, 16, 242, 0.12); --card-border-tint: rgba(102, 16, 242, 0.2); --icon-bg: rgba(102, 16, 242, 0.1); --icon-color: #6610f2; }

        .feature-card-premium {
            background: linear-gradient(165deg, #ffffff 40%, var(--card-bg-tint) 100%);
            border: 1px solid rgba(0,0,0,0.06); border-radius: 24px; padding: 30px 25px; 
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            position: relative; overflow: hidden; height: 100%; z-index: 1; display: flex; flex-direction: column; align-items: flex-start;
            box-shadow: 0 15px 35px -5px rgba(0, 0, 0, 0.08), 0 5px 15px rgba(0,0,0,0.03);
        }
        [data-bs-theme="dark"] .feature-card-premium {
            background: linear-gradient(145deg, var(--glass-bg-dark) 0%, var(--card-bg-tint, transparent) 100%);
            border-color: var(--card-border-tint, var(--glass-border-dark)); box-shadow: 0 15px 35px -5px rgba(0, 0, 0, 0.3);
        }
        .feature-card-premium::before {
            content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 3px; 
            background: var(--icon-color, var(--primary-color)); transform: scaleX(0); transform-origin: left; transition: transform 0.4s ease; z-index: 2; opacity: 0.8;
        }
        .feature-card-premium:hover { 
            transform: translateY(-10px); 
            box-shadow: 0 25px 50px -12px var(--card-bg-tint), 0 10px 20px rgba(0,0,0,0.05); border-color: var(--card-border-tint); 
        }
        .feature-card-premium:hover::before { transform: scaleX(1); }
        
        .icon-box {
            width: 60px; height: 60px; border-radius: 18px; 
            display: flex; align-items: center; justify-content: center; font-size: 1.6rem; margin-bottom: 25px; transition: all 0.4s ease;
            background: linear-gradient(135deg, #ffffff 0%, var(--icon-bg) 100%); background-color: var(--icon-bg); color: var(--icon-color, var(--primary-color));
            box-shadow: 0 4px 15px rgba(0,0,0,0.05); border: 1px solid rgba(0,0,0,0.03);
        }
        [data-bs-theme="dark"] .icon-box { background: var(--icon-bg); border-color: rgba(255,255,255,0.05); }
        .feature-card-premium:hover .icon-box { 
            transform: scale(1.1); border-radius: 50%; box-shadow: 0 10px 25px var(--card-bg-tint);
            background: var(--icon-color); color: white; 
        }
        
        .feature-card-premium h5 { margin-bottom: 12px; font-weight: 700; letter-spacing: -0.5px; }
        .feature-card-premium p { line-height: 1.6; opacity: 0.8; }

        /* --- Industry Cards (Fixed & Optimized) --- */
        /* 修复：重新定义 .industry-card 样式，确保高度和圆角正确 */
        .industry-card { 
            position: relative; 
            border-radius: 20px; 
            overflow: hidden; 
            height: 260px; 
            cursor: pointer; 
            border: 1px solid rgba(0,0,0,0.05); 
            background: #000; /* 默认黑色底，防止图片加载慢时透出亮色 */
            transform: translateZ(0); 
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }
        [data-bs-theme="dark"] .industry-card { border: 1px solid rgba(255,255,255,0.1); }
        
        .industry-card-bg { 
            position: absolute; top: 0; left: 0; width: 100%; height: 100%; 
            background-size: cover; background-position: center; 
            transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1), filter 0.4s ease; 
            filter: brightness(0.75) grayscale(0.1);
        }
        
        .industry-card:hover { transform: translateY(-5px); box-shadow: 0 20px 40px rgba(0,0,0,0.15); }
        .industry-card:hover .industry-card-bg { transform: scale(1.1); filter: brightness(0.6) grayscale(0); }
        
        .industry-content { 
            position: relative; z-index: 2; height: 100%; 
            display: flex; flex-direction: column; justify-content: flex-end; 
            padding: 25px; 
            background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.6) 40%, rgba(0,0,0,0) 100%); 
        }
        
        /* 优化：图标默认半透明，悬浮全不透明 */
        .industry-icon { 
            font-size: 2.2rem; color: #60a5fa; margin-bottom: 10px; 
            transform: translateY(20px); opacity: 0.6; 
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); 
        }
        .industry-card:hover .industry-icon { transform: translateY(0); opacity: 1; }
        
        .industry-title { 
            color: white; font-weight: 700; font-size: 1.35rem; margin-bottom: 5px; 
            text-shadow: 0 2px 4px rgba(0,0,0,0.3); transition: transform 0.4s ease; 
        }
        .industry-card:hover .industry-title { transform: translateY(-5px); }
        
        .industry-desc { 
            color: rgba(255,255,255,0.9); font-size: 0.9rem; max-height: 0; overflow: hidden; 
            opacity: 0; transition: all 0.5s ease; line-height: 1.5; 
        }
        .industry-card:hover .industry-desc { max-height: 100px; opacity: 1; margin-top: 5px; }


        /* --- Custom & Agent Sections --- */
        .custom-section { background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%); color: white; position: relative; overflow: hidden; }
        .custom-card {
            background: rgba(255, 255, 255, 0.1); backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2); border-radius: 20px; padding: 25px; 
            transition: all 0.3s ease; height: 100%; color: white;
        }
        .custom-card:hover { background: rgba(255, 255, 255, 0.15); transform: translateY(-5px); box-shadow: 0 15px 30px rgba(0,0,0,0.15); border-color: rgba(255, 255, 255, 0.4); }
        .custom-icon { width: 45px; height: 45px; background: rgba(255, 255, 255, 0.2); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.3rem; margin-bottom: 15px; }

        .agent-section { 
            background-color: #f8fafc; 
            background-image: radial-gradient(at 0% 0%, rgba(37, 99, 235, 0.03) 0px, transparent 50%), radial-gradient(at 100% 100%, rgba(6, 182, 212, 0.03) 0px, transparent 50%);
            position: relative; 
        }
        [data-bs-theme="dark"] .agent-section { 
            background-color: #1e293b; background-image: radial-gradient(at 0% 0%, rgba(37, 99, 235, 0.1) 0px, transparent 50%);
        }
        
        .agent-card-home {
            background: linear-gradient(180deg, #ffffff 0%, #f8faff 100%);
            border: 1px solid rgba(0,0,0,0.06); border-radius: 28px; padding: 40px 30px; text-align: center; 
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); height: 100%; position: relative; overflow: hidden; 
            display: flex; flex-direction: column; align-items: center; box-shadow: 0 10px 40px -10px rgba(0,0,0,0.06);
        }
        [data-bs-theme="dark"] .agent-card-home { 
            background: linear-gradient(145deg, #334155 0%, #1e293b 100%);
            border: 1px solid rgba(148, 163, 184, 0.2); box-shadow: 0 10px 30px rgba(0,0,0,0.4);
        }
        .agent-card-home:hover { transform: translateY(-12px); box-shadow: 0 25px 50px -12px rgba(0,0,0,0.12); }
        [data-bs-theme="dark"] .agent-card-home:hover {
            background: linear-gradient(145deg, #475569 0%, #1e293b 100%); border-color: rgba(255,255,255,0.3); box-shadow: 0 20px 40px rgba(0,0,0,0.5);
        }
        .agent-card-basic { } 
        
        .agent-card-exclusive { 
            background: linear-gradient(180deg, #ffffff 40%, #eff6ff 100%); border: 2px solid #3b82f6; 
            box-shadow: 0 20px 50px -10px rgba(59, 130, 246, 0.15); z-index: 10;
        }
        [data-bs-theme="dark"] .agent-card-exclusive { 
            background: radial-gradient(circle at center top, rgba(37, 99, 235, 0.3) 0%, rgba(15, 23, 42, 0.95) 80%);
            border: 2px solid rgba(59, 130, 246, 0.6); box-shadow: 0 20px 60px -10px rgba(37, 99, 235, 0.3);
        }
        .agent-card-exclusive:hover { transform: scale(1.03) translateY(-12px); box-shadow: 0 30px 60px -12px rgba(59, 130, 246, 0.25); }
        [data-bs-theme="dark"] .agent-card-exclusive:hover { border-color: #60a5fa; box-shadow: 0 30px 70px -12px rgba(37, 99, 235, 0.5); }
        
        .agent-card-oem { 
            background: linear-gradient(180deg, #ffffff 40%, #fffbeb 100%); border: 1px solid rgba(245, 158, 11, 0.1); 
        }
        [data-bs-theme="dark"] .agent-card-oem {
            background: linear-gradient(145deg, #334155 0%, #1e293b 100%);
            border-color: rgba(245, 158, 11, 0.3);
        }
        [data-bs-theme="dark"] .agent-card-oem:hover {
            background: linear-gradient(145deg, #451a03 0%, #1e293b 100%); border-color: rgba(245, 158, 11, 0.6);
        }

        .agent-icon-box { 
            width: 80px; height: 80px; margin-bottom: 25px; border-radius: 22px; 
            display: flex; align-items: center; justify-content: center; font-size: 2.5rem; transition: 0.4s ease; position: relative;
            box-shadow: inset 0 0 0 1px rgba(255,255,255,0.4), 0 10px 20px rgba(0,0,0,0.03);
        }
        .icon-basic { background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%); color: #2563eb; }
        .agent-card-basic:hover .icon-basic { transform: scale(1.1) rotate(-5deg); background: #2563eb; color: white; }
        .icon-exclusive { background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%); color: white; box-shadow: 0 10px 20px rgba(37, 99, 235, 0.3); }
        .agent-card-exclusive:hover .icon-exclusive { transform: scale(1.1) rotate(-5deg); box-shadow: 0 15px 30px rgba(37, 99, 235, 0.4); }
        .icon-oem { background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%); color: #d97706; }
        .agent-card-oem:hover .icon-oem { transform: scale(1.1) rotate(-5deg); background: #d97706; color: white; }

        .agent-feature-list { list-style: none; padding: 0; margin: 25px 0 35px; width: 100%; text-align: left; }
        .agent-feature-list li { padding: 10px 0; display: flex; align-items: center; color: #64748b; font-size: 0.95rem; border-bottom: 1px dashed rgba(0,0,0,0.06); }
        [data-bs-theme="dark"] .agent-feature-list li { color: #94a3b8; border-color: rgba(255,255,255,0.05); }
        .agent-feature-list li:last-child { border-bottom: none; }
        .agent-feature-list li i { margin-right: 12px; flex-shrink: 0; font-size: 1.1rem; }
        .agent-badge { 
            position: absolute; top: 12px; right: -30px; background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%); 
            color: white; padding: 5px 30px; transform: rotate(45deg); font-size: 0.75rem; font-weight: 800; letter-spacing: 1px;
            box-shadow: 0 2px 10px rgba(220, 38, 38, 0.3); z-index: 20;
        }
        .agent-btn { transition: all 0.3s; font-weight: 600; padding: 12px 0; }
        .agent-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 15px rgba(0,0,0,0.1); }

        /* --- Security Section --- */
        .security-section { background: linear-gradient(180deg, #f8fafc 0%, #f0fdf4 100%); overflow: hidden; position: relative; }
        [data-bs-theme="dark"] .security-section { background: linear-gradient(180deg, #0f172a 0%, #062c25 100%); }
        .security-bg-grid {
            position: absolute; inset: 0;
            background-image: linear-gradient(rgba(16, 185, 129, 0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(16, 185, 129, 0.05) 1px, transparent 1px);
            background-size: 40px 40px; opacity: 0.5; pointer-events: none;
        }
        .security-visual { height: 450px; width: 100%; position: relative; perspective: 1000px; }
        .shield-main {
            width: 140px; height: 140px; background: linear-gradient(135deg, #10b981 0%, #047857 100%);
            border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 5rem; color: white;
            box-shadow: 0 0 60px rgba(16, 185, 129, 0.4), inset 0 0 20px rgba(255,255,255,0.3); z-index: 10; position: relative;
            animation: floatShield 6s ease-in-out infinite;
        }
        @keyframes floatShield { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
        .shield-main::after {
            content: ''; position: absolute; inset: -5px; border-radius: 50%; border: 2px solid rgba(16, 185, 129, 0.6);
            opacity: 0; animation: pulseRing 2s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
        }
        @keyframes pulseRing { 0% { transform: scale(0.9); opacity: 1; } 100% { transform: scale(1.6); opacity: 0; } }
        .security-radar {
            position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 400px; height: 400px;
            border-radius: 50%; border: 1px solid rgba(16, 185, 129, 0.1);
            background: conic-gradient(from 0deg, transparent 0deg, rgba(16, 185, 129, 0.1) 60deg, transparent 60deg);
            animation: radarSpin 4s linear infinite; z-index: 1;
        }
        .security-radar::before { content: ''; position: absolute; inset: 50px; border-radius: 50%; border: 1px dashed rgba(16, 185, 129, 0.2); }
        @keyframes radarSpin { from { transform: translate(-50%, -50%) rotate(0deg); } to { transform: translate(-50%, -50%) rotate(360deg); } }
        .security-orbit {
            position: absolute; width: 64px; height: 64px; background: rgba(255, 255, 255, 0.9); backdrop-filter: blur(5px);
            border: 1px solid rgba(16, 185, 129, 0.2); border-radius: 18px; box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            display: flex; align-items: center; justify-content: center; color: #059669; font-size: 1.8rem; z-index: 11; transition: all 0.3s;
        }
        [data-bs-theme="dark"] .security-orbit { background: rgba(30, 41, 59, 0.8); color: #34d399; border-color: rgba(52, 211, 153, 0.3); }
        .security-orbit:hover { transform: scale(1.1); color: #10b981; border-color: #10b981; }
        .orbit-1 { top: 10%; left: 10%; animation: orbitFloat 5s ease-in-out infinite alternate; }
        .orbit-2 { bottom: 15%; right: 10%; animation: orbitFloat 6s ease-in-out infinite alternate-reverse; }
        .orbit-3 { top: 40%; right: 0%; animation: orbitFloat 7s ease-in-out infinite alternate; }
        .orbit-4 { bottom: 10%; left: 20%; animation: orbitFloat 5.5s ease-in-out infinite alternate-reverse; font-size: 1.4rem; width: 50px; height: 50px; opacity: 0.8; }
        @keyframes orbitFloat { 0% { transform: translate(0, 0); } 100% { transform: translate(10px, -10px); } }
        .security-card {
            background: rgba(255, 255, 255, 0.6); backdrop-filter: blur(12px); border: 1px solid rgba(16, 185, 129, 0.15); border-radius: 20px; padding: 20px; height: 100%;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); display: flex; align-items: flex-start; gap: 15px;
        }
        [data-bs-theme="dark"] .security-card { background: rgba(15, 23, 42, 0.6); border-color: rgba(52, 211, 153, 0.1); }
        .security-card:hover {
            background: #ffffff; transform: translateY(-5px); box-shadow: 0 15px 30px -5px rgba(16, 185, 129, 0.15); border-color: rgba(16, 185, 129, 0.5);
        }
        [data-bs-theme="dark"] .security-card:hover { background: rgba(30, 41, 59, 0.9); box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.3); border-color: rgba(52, 211, 153, 0.4); }
        .security-icon-box { width: 50px; height: 50px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; flex-shrink: 0; transition: all 0.3s ease; }
        .security-card:hover .security-icon-box.bg-success-subtle { background-color: #198754 !important; color: white !important; }
        .security-card:hover .security-icon-box.bg-primary-subtle { background-color: #0d6efd !important; color: white !important; }
        .security-card:hover .security-icon-box.bg-warning-subtle { background-color: #ffc107 !important; color: white !important; }
        .security-card:hover .security-icon-box.bg-info-subtle { background-color: #0dcaf0 !important; color: white !important; }

        /* --- Testimonials --- */
        .testimonial-section { position: relative; padding: 40px 0; background-color: var(--hero-bg-light); overflow: hidden; }
        [data-bs-theme="dark"] .testimonial-section { background-color: var(--hero-bg-dark); }
        .testimonial-bg-circle { position: absolute; border-radius: 50%; background: radial-gradient(circle, rgba(37, 99, 235, 0.05) 0%, transparent 70%); z-index: 0; pointer-events: none; }
        .testimonial-card {
            background: #ffffff; border: 1px solid rgba(0,0,0,0.05); border-radius: 20px; padding: 30px 25px; height: 100%;
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); position: relative; z-index: 1; display: flex; flex-direction: column;
            box-shadow: 0 4px 20px rgba(0,0,0,0.03);
        }
        [data-bs-theme="dark"] .testimonial-card { background: var(--glass-bg-dark); border-color: var(--glass-border-dark); }
        .testimonial-card:hover { transform: translateY(-10px); box-shadow: 0 20px 50px rgba(0,0,0,0.08); border-color: var(--primary-light); }
        .quote-bg-icon { position: absolute; top: 20px; right: 25px; font-size: 5rem; line-height: 1; color: var(--primary-color); opacity: 0.05; font-family: serif; z-index: -1; pointer-events: none; transition: all 0.5s ease; }
        .testimonial-card:hover .quote-bg-icon { transform: scale(1.2) rotate(15deg); opacity: 0.1; }
        .avatar-box { width: 48px; height: 48px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.25rem; font-weight: bold; color: white; flex-shrink: 0; box-shadow: 0 5px 15px rgba(0,0,0,0.15); }
        .avatar-blue { background: linear-gradient(135deg, #3b82f6, #2563eb); }
        .avatar-green { background: linear-gradient(135deg, #22c55e, #16a34a); }
        .avatar-orange { background: linear-gradient(135deg, #f97316, #ea580c); }
        .star-rating { color: #f59e0b; font-size: 0.9rem; margin-bottom: 15px; }

        /* Footer & Others */
        .about-home-section { padding: 40px 0; background: linear-gradient(180deg, var(--hero-bg-light) 0%, white 100%); }
        [data-bs-theme="dark"] .about-home-section { background: linear-gradient(180deg, var(--hero-bg-dark) 0%, #020617 100%); }
        .about-stat-card {
            background: #ffffff; border: 1px solid rgba(0,0,0,0.05); border-radius: 24px; padding: 30px 20px; text-align: center;
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); height: 100%; position: relative; overflow: hidden;
            box-shadow: 0 10px 30px -10px rgba(0,0,0,0.05);
        }
        [data-bs-theme="dark"] .about-stat-card { background: rgba(30, 41, 59, 0.6); border-color: rgba(255, 255, 255, 0.05); }
        .about-stat-card:hover { transform: translateY(-8px); box-shadow: 0 20px 40px -10px rgba(37, 99, 235, 0.15); border-color: var(--primary-light); }
        .about-stat-card::before {
            content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.05) 0%, transparent 60%);
            opacity: 0; transition: opacity 0.4s ease; z-index: 0; pointer-events: none;
        }
        .about-stat-card:hover::before { opacity: 1; }
        .about-icon { 
            width: 56px; height: 56px; border-radius: 16px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin: 0 auto 15px; 
            background: linear-gradient(135deg, #e0f2fe 0%, #dbeafe 100%); color: var(--primary-color);
            position: relative; z-index: 1; transition: transform 0.4s ease;
        }
        [data-bs-theme="dark"] .about-icon { background: rgba(37, 99, 235, 0.2); color: var(--primary-light); }
        .about-stat-card:hover .about-icon { transform: scale(1.1) rotate(5deg); background: var(--primary-color); color: white; }
        .about-stat-number {
            font-size: 2.5rem; font-weight: 800; margin-bottom: 5px;
            background: var(--gradient-text); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            position: relative; z-index: 1;
        }
        .about-stat-label { font-size: 0.9rem; color: var(--bs-body-color); opacity: 0.7; position: relative; z-index: 1; font-weight: 500; }
        
        .footer-premium { background-color: #020617; color: #94a3b8; padding: 40px 0 20px; }
        .footer-link { color: #94a3b8; text-decoration: none; transition: 0.2s; display: block; margin-bottom: 8px; font-size: 0.9rem; }
        .footer-link:hover { color: white; }
        .float-qr { position: fixed; right: 30px; bottom: 30px; z-index: 1000; background: white; padding: 10px; border-radius: 50%; box-shadow: 0 10px 30px rgba(0,0,0,0.2); transition: transform 0.3s; cursor: pointer; }
        [data-bs-theme="dark"] .float-qr { background: #2563eb; color: white; }
        .float-qr:hover { transform: scale(1.1) rotate(5deg); }
        .scroll-top-btn { position: fixed; bottom: 30px; right: 30px; width: 50px; height: 50px; background: var(--primary-color); color: white; border: none; border-radius: 50%; box-shadow: 0 4px 10px rgba(0,0,0,0.2); display: flex; align-items: center; justify-content: center; cursor: pointer; opacity: 0; visibility: hidden; transition: all 0.3s; z-index: 999; }
        .scroll-top-btn.visible { opacity: 1; visibility: visible; }
        .scroll-top-btn:hover { background: #1d4ed8; transform: translateY(-3px); }

        @media (max-width: 991px) {
            .hero-section { padding: 90px 0 40px; }
            .display-3 { font-size: 2.2rem; }
            .hero-ui-group { height: 320px; margin-top: 20px; transform: scale(0.9); transform-origin: center top; }
            .ui-card-main { left: 50% !important; top: 50% !important; transform: translate(-50%, -50%) !important; width: 90%; }
            .ui-card-sub-1 { top: 0% !important; right: 0 !important; left: auto !important; }
            .ui-card-sub-2 { bottom: 0% !important; left: 0 !important; }
            .ui-card-sub-3 { top: 0% !important; left: 0 !important; transform: scale(0.9); }
            .glass-panel .nav-pills { margin-bottom: 30px; padding-bottom: 15px; border-bottom: 1px solid rgba(0,0,0,0.05); }
            .agent-card-exclusive { transform: none; margin: 15px 0; }
            .agent-card-exclusive:hover { transform: translateY(-5px); }
        }
        @media (min-width: 992px) {
            .agent-card-exclusive { transform: scale(1.05); z-index: 2; }
            .agent-card-exclusive:hover { transform: scale(1.05) translateY(-10px); }
        }