:root {
            --primary-color: #2563eb;
            --primary-light: #60a5fa;
            --accent-color: #06b6d4;
            --tech-purple: #7c3aed;
            --gradient-text: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
            --hero-bg-light: #f8fafc;
            --hero-bg-dark: #0f172a;
            --glass-bg-light: rgba(255, 255, 255, 0.8);
            --glass-bg-dark: rgba(15, 23, 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: 80px; }
        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); }

        /* --- 导航栏 --- */
        .navbar {
            backdrop-filter: blur(12px);
            background-color: rgba(255,255,255,0.85) !important;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            padding: 1rem 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: 
                linear-gradient(rgba(37, 99, 235, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(37, 99, 235, 0.03) 1px, transparent 1px);
            background-size: 50px 50px;
            padding: 160px 0 100px;
            position: relative;
            overflow: hidden;
        }
        [data-bs-theme="dark"] .hero-section {
            background-color: var(--hero-bg-dark);
            background-image: 
                linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.03) 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;
        }
        
        /* 代码窗口 */
        .code-window {
            background: #1e1e1e; border-radius: 12px; box-shadow: 0 20px 50px rgba(0,0,0,0.3); overflow: hidden;
            font-family: 'Fira Code', monospace; font-size: 0.9rem; position: relative;
            border: 1px solid rgba(255,255,255,0.1); transform: perspective(1000px) rotateY(-5deg); transition: transform 0.5s ease; z-index: 2;
        }
        .code-window:hover { transform: perspective(1000px) rotateY(0deg); }
        .window-header { background: #252526; padding: 12px 15px; display: flex; gap: 8px; border-bottom: 1px solid #333; }
        .dot { width: 12px; height: 12px; border-radius: 50%; }
        .dot-red { background: #ff5f56; }
        .dot-yellow { background: #ffbd2e; }
        .dot-green { background: #27c93f; }
        .code-content { padding: 25px; color: #d4d4d4; line-height: 1.6; }
        
        .token.keyword { color: #569cd6; font-weight: bold; }
        .token.class-name { color: #4ec9b0; }
        .token.function { color: #dcdcaa; }
        .token.string { color: #ce9178; }
        .token.comment { color: #6a9955; font-style: italic; }
        .cursor { display: inline-block; width: 8px; height: 1.2em; background: #d4d4d4; animation: blink 1s infinite; vertical-align: middle; }
        @keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

        /* --- Tech Stack (Tabs) --- */
        .tech-tabs .nav-link {
            border: none;
            color: var(--bs-body-color);
            font-weight: 600;
            padding: 10px 20px;
            border-radius: 50px;
            margin-right: 10px;
            transition: all 0.3s;
            opacity: 0.6;
        }
        .tech-tabs .nav-link::after { content: none; }
        .tech-tabs .nav-link:hover { opacity: 1; background: rgba(37, 99, 235, 0.05); }
        .tech-tabs .nav-link.active {
            background: var(--primary-color);
            color: white !important;
            opacity: 1;
            box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
        }

        .tech-icon-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 20px; padding: 30px 0; }
        .tech-item {
            display: flex; flex-direction: column; align-items: center; padding: 20px;
            background: var(--glass-bg-light); border: 1px solid rgba(0,0,0,0.05); border-radius: 16px; transition: all 0.3s;
        }
        [data-bs-theme="dark"] .tech-item { background: rgba(255,255,255,0.05); border-color: rgba(255,255,255,0.1); }
        .tech-item:hover { transform: translateY(-5px); border-color: var(--primary-color); box-shadow: 0 10px 20px rgba(0,0,0,0.08); }
        .tech-item i { font-size: 2rem; margin-bottom: 10px; }

        /* --- Integration Ecosystem --- */
        .integration-section { position: relative; overflow: hidden; background: #0f172a; color: white; padding: 80px 0; }
        .integration-bg-glow {
            position: absolute; width: 600px; height: 600px; background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
            top: 50%; left: 0; transform: translate(-50%, -50%); z-index: 0; pointer-events: none;
        }
        .orbit-container { position: relative; height: 400px; display: flex; align-items: center; justify-content: center; }
        .integration-hub {
            position: relative; width: 100px; height: 100px; background: white; border-radius: 50%;
            display: flex; align-items: center; justify-content: center; z-index: 10;
            box-shadow: 0 0 30px rgba(37, 99, 235, 0.6);
        }
        .orbit-ring {
            position: absolute; border: 1px dashed rgba(255,255,255,0.1); border-radius: 50%;
            animation: spin linear infinite;
        }
        .orbit-item {
            position: absolute; width: 50px; height: 50px; background: rgba(30, 41, 59, 0.8); backdrop-filter: blur(5px);
            border-radius: 50%; display: flex; align-items: center; justify-content: center; border: 1px solid rgba(255,255,255,0.15);
            font-size: 1.2rem; color: white; transition: 0.3s; box-shadow: 0 4px 10px rgba(0,0,0,0.3);
        }
        .orbit-item:hover { background: var(--primary-color); transform: scale(1.2); z-index: 20; border-color: white; }
        @keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
        
        /* Integration Cards */
        .int-category-card {
            background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 16px; padding: 20px; transition: all 0.3s; height: 100%;
        }
        .int-category-card:hover { background: rgba(255, 255, 255, 0.08); border-color: var(--primary-color); transform: translateY(-5px); }
        .int-icon-wrapper { width: 50px; height: 50px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 15px; }
        .int-list { margin: 0; padding: 0; list-style: none; font-size: 0.85rem; opacity: 0.7; }
        .int-list li { margin-bottom: 6px; display: flex; align-items: center; gap: 8px; }
        .int-list li::before { content: ''; width: 4px; height: 4px; background: var(--accent-color); border-radius: 50%; }

        /* --- Pain Points Cards --- */
        .pain-point-card {
            background: white; border-radius: 16px; padding: 30px; height: 100%; transition: all 0.3s;
            border-top: 4px solid var(--primary-color); box-shadow: 0 10px 30px rgba(0,0,0,0.03);
        }
        [data-bs-theme="dark"] .pain-point-card { background: #1e293b; box-shadow: 0 10px 30px rgba(0,0,0,0.2); border-color: var(--tech-purple); }
        .pain-point-card:hover { transform: translateY(-5px); box-shadow: 0 20px 40px rgba(0,0,0,0.08); }
        .pain-icon { width: 60px; height: 60px; background: rgba(37, 99, 235, 0.1); color: var(--primary-color); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.8rem; margin-bottom: 20px; }

        /* --- Bento Grid --- */
        .bento-grid { display: grid; grid-template-columns: repeat(4, 1fr); grid-template-rows: repeat(2, 1fr); gap: 20px; }
        .bento-item { background: white; border-radius: 20px; padding: 30px; border: 1px solid rgba(0,0,0,0.05); transition: all 0.3s; display: flex; flex-direction: column; justify-content: center; }
        [data-bs-theme="dark"] .bento-item { background: #1e293b; border-color: rgba(255,255,255,0.05); }
        .bento-item:hover { transform: translateY(-5px); box-shadow: 0 15px 30px rgba(0,0,0,0.08); border-color: var(--primary-light); }
        .bento-large { grid-column: span 2; grid-row: span 2; background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%); }
        [data-bs-theme="dark"] .bento-large { background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%); }
        .bento-medium { grid-column: span 2; }
        .bento-icon { font-size: 2rem; margin-bottom: 15px; color: var(--primary-color); }

        /* --- Success Stories --- */
        .case-card { 
            background: white; border-radius: 20px; overflow: hidden; border: 1px solid rgba(0,0,0,0.05); height: 100%; transition: 0.3s; 
        }
        [data-bs-theme="dark"] .case-card { background: #1e293b; border-color: rgba(255,255,255,0.05); }
        .case-card:hover { transform: translateY(-10px); box-shadow: 0 20px 40px rgba(0,0,0,0.1); }
        
        .case-img { 
            height: 200px; position: relative; overflow: hidden; display: flex; align-items: center; justify-content: center; 
        }
        .case-img i { 
            font-size: 5rem; transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1); opacity: 0.6; 
        }
        .case-card:hover .case-img i { transform: scale(1.15) rotate(-5deg); opacity: 1; }
        
        /* Case Themes */
        .case-img-blue { background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%); }
        .case-img-blue i { color: #3b82f6; }
        [data-bs-theme="dark"] .case-img-blue { background: rgba(59, 130, 246, 0.15); }
        
        .case-img-green { background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%); }
        .case-img-green i { color: #22c55e; }
        [data-bs-theme="dark"] .case-img-green { background: rgba(34, 197, 94, 0.15); }
        
        .case-img-orange { background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 100%); }
        .case-img-orange i { color: #f97316; }
        [data-bs-theme="dark"] .case-img-orange { background: rgba(249, 115, 22, 0.15); }

        .case-content { padding: 25px; }
        .case-tag { font-size: 0.75rem; font-weight: bold; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 10px; display: block; }
        .case-stat { display: flex; gap: 20px; margin-top: 20px; padding-top: 20px; border-top: 1px dashed rgba(0,0,0,0.1); }
        
        /* --- QA Standards --- */
        .qa-section { background-color: var(--bs-body-bg); position: relative; }
        .qa-item { display: flex; align-items: start; gap: 15px; padding: 20px; border-radius: 12px; transition: 0.3s; border: 1px solid transparent; }
        .qa-item:hover { background: var(--hero-bg-light); border-color: rgba(0,0,0,0.05); }
        .qa-icon { width: 40px; height: 40px; background: var(--primary-color); color: white; border-radius: 8px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }

        /* --- Process Steps --- */
        .process-section { background-color: var(--hero-bg-light); position: relative; }
        [data-bs-theme="dark"] .process-section { background-color: var(--hero-bg-dark); }
        .timeline-steps { display: flex; justify-content: space-between; position: relative; margin-top: 40px; }
        .timeline-steps::before { content: ''; position: absolute; top: 25px; left: 5%; right: 5%; height: 2px; background: #e2e8f0; z-index: 0; }
        [data-bs-theme="dark"] .timeline-steps::before { background: #334155; }
        .step-item { position: relative; z-index: 1; text-align: center; width: 12%; }
        .step-circle { width: 50px; height: 50px; background: var(--bs-body-bg); border: 2px solid var(--primary-color); color: var(--primary-color); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 1.2rem; margin: 0 auto 15px; transition: all 0.3s; }
        .step-item:hover .step-circle { background: var(--primary-color); color: white; transform: scale(1.1); box-shadow: 0 0 0 8px rgba(37, 99, 235, 0.1); }

        /* --- FAQ Accordion --- */
        .faq-accordion .accordion-item {
            background: var(--glass-bg-light);
            border: 1px solid var(--glass-border-light);
            border-radius: 16px !important;
            margin-bottom: 20px;
            box-shadow: 0 4px 10px rgba(0,0,0,0.02);
            transition: all 0.3s ease;
            overflow: hidden;
        }
        [data-bs-theme="dark"] .faq-accordion .accordion-item {
            background: var(--glass-bg-dark);
            border-color: var(--glass-border-dark);
        }
        .faq-accordion .accordion-item:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.08);
            border-color: var(--primary-light);
        }
        .faq-accordion .accordion-button {
            padding: 1.25rem 1.5rem;
            background: transparent !important;
            color: var(--bs-body-color);
            font-weight: 600;
            font-size: 1.05rem;
            box-shadow: none !important;
        }
        .faq-accordion .accordion-button:not(.collapsed) {
            color: var(--primary-color);
            background: rgba(37, 99, 235, 0.05) !important;
        }
        .faq-accordion .accordion-body {
            padding: 0 1.5rem 1.5rem 1.5rem;
            color: var(--bs-secondary-color);
            line-height: 1.6;
            font-size: 0.95rem;
        }
        .faq-accordion .accordion-button::after {
            background-size: 1rem;
            transition: transform 0.3s ease;
        }

        /* --- Footer & CTA --- */
        .cta-box { background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%); border-radius: 30px; padding: 80px 40px; position: relative; overflow: hidden; color: white; border: 1px solid rgba(255,255,255,0.1); }
        .cta-pattern { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background-image: linear-gradient(45deg, rgba(255,255,255,0.03) 25%, transparent 25%, transparent 50%, rgba(255,255,255,0.03) 50%, rgba(255,255,255,0.03) 75%, transparent 75%, transparent); background-size: 40px 40px; }
        
        .footer-premium { background-color: #020617; color: #94a3b8; padding: 80px 0 30px; }
        .footer-link { color: #94a3b8; text-decoration: none; transition: 0.2s; display: block; margin-bottom: 10px; }
        .footer-link:hover { color: white; }

        .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: 120px 0 60px; }
            .display-4 { font-size: 2rem; }
            .bento-grid { grid-template-columns: 1fr; grid-template-rows: auto; }
            .bento-large, .bento-medium { grid-column: span 1; grid-row: span 1; }
            .timeline-steps { flex-direction: column; align-items: flex-start; gap: 30px; }
            .timeline-steps::before { top: 25px; bottom: 25px; left: 25px; right: auto; width: 2px; height: auto; }
            .step-item { width: 100%; text-align: left; display: flex; align-items: center; gap: 20px; }
            .step-circle { margin: 0; }
            .orbit-container { height: 350px; transform: scale(0.85); margin-bottom: 40px; }
            
            /* 代码窗口去掉3D */
            .code-window { transform: none !important; margin-top: 30px; }
            
            /* 技术栈菜单横向滚动 */
            .tech-tabs {
                flex-wrap: nowrap;
                overflow-x: auto;
                padding-bottom: 10px;
                -webkit-overflow-scrolling: touch;
            }
            .tech-tabs::-webkit-scrollbar { display: none; }
        }
        
        @media (max-width: 576px) {
            .orbit-container { transform: scale(0.65); height: 300px; }
            .hero-section { padding-top: 100px; }
            .display-4 { font-size: 1.8rem; }
            .case-img { height: 160px; }
            .case-img i { font-size: 4rem; }
        }