* { margin: 0; padding: 0; box-sizing: border-box; }
        :root {
            --deep-blue: #0A1628;
            --tech-blue: #2563EB;
            --light-blue: #3B82F6;
            --cyan: #06B6D4;
            --white: #FFFFFF;
            --light-gray: #F8FAFC;
            --mid-gray: #E2E8F0;
            --text-dark: #1E293B;
            --text-mid: #64748B;
            --text-light: #94A3B8;
        }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-dark);
            line-height: 1.6;
            background: var(--white);
        }

        /* ===== 导航栏 ===== */
        .navbar {
            position: fixed;
            top: 0; left: 0; right: 0;
            z-index: 1000;
            padding: 20px 0;
            transition: all 0.3s ease;
            background: transparent;
        }
        .navbar.scrolled, .navbar.inner-page {
            background: rgba(10, 22, 40, 0.95);
            backdrop-filter: blur(10px);
            padding: 14px 0;
            box-shadow: 0 2px 20px rgba(0,0,0,0.1);
        }
        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--white);
            font-size: 20px;
            font-weight: 700;
            text-decoration: none;
            cursor: pointer;
        }
        .nav-logo-mark {
            display: block;
            height: 36px;
            width: auto;
            flex-shrink: 0;
        }
        .nav-menu {
            display: flex;
            gap: 36px;
            list-style: none;
        }
        .nav-menu a {
            color: rgba(255,255,255,0.85);
            text-decoration: none;
            font-size: 15px;
            transition: color 0.2s;
            cursor: pointer;
        }
        .nav-menu a:hover, .nav-menu a.active { color: var(--white); }
        .nav-cta {
            background: var(--tech-blue);
            color: white;
            padding: 10px 22px;
            border-radius: 8px;
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: background 0.2s;
            cursor: pointer;
            border: none;
        }
        .nav-cta:hover { background: var(--light-blue); }
        .mobile-menu-btn { display: none; }


        /* ===== Hero 区域（首页） ===== */
        .hero {
            min-height: 100vh;
            background: linear-gradient(180deg, #0A1628 0%, #0F1D35 100%);
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            padding: 120px 0 80px;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0; bottom: 0;
            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: 60px 60px;
        }
        .hero-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            position: relative;
            z-index: 1;
        }
        .hero-content { max-width: 720px; }
        .hero-badge {
            display: inline-block;
            background: rgba(37, 99, 235, 0.15);
            border: 1px solid rgba(37, 99, 235, 0.3);
            color: #93C5FD;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 13px;
            margin-bottom: 24px;
        }
        .hero h1 {
            font-size: 56px;
            font-weight: 800;
            color: var(--white);
            line-height: 1.2;
            margin-bottom: 24px;
            letter-spacing: -0.02em;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, #60A5FA, #22D3EE);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-subtitle {
            font-size: 20px;
            color: rgba(255,255,255,0.7);
            line-height: 1.7;
            margin-bottom: 40px;
            max-width: 600px;
        }
        .hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
        .btn-primary {
            background: var(--tech-blue);
            color: white;
            padding: 14px 32px;
            border-radius: 10px;
            text-decoration: none;
            font-size: 16px;
            font-weight: 500;
            transition: all 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            cursor: pointer;
            border: none;
        }
        .btn-primary:hover { background: var(--light-blue); transform: translateY(-2px); }
        .btn-secondary {
            background: transparent;
            color: white;
            padding: 14px 32px;
            border-radius: 10px;
            text-decoration: none;
            font-size: 16px;
            font-weight: 500;
            border: 1px solid rgba(255,255,255,0.25);
            transition: all 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            cursor: pointer;
        }
        .btn-secondary:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.4); }
        .hero-stats {
            display: flex;
            gap: 48px;
            margin-top: 64px;
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        .hero-stat-num { font-size: 36px; font-weight: 700; color: var(--white); }
        .hero-stat-label { font-size: 14px; color: rgba(255,255,255,0.6); margin-top: 4px; }

        /* ===== 内页 Hero ===== */
        .page-hero {
            background: linear-gradient(180deg, #0A1628 0%, #0F1D35 100%);
            padding: 160px 24px 80px;
            text-align: center;
        }
        .page-hero h1 {
            font-size: 48px;
            font-weight: 800;
            color: var(--white);
            margin-bottom: 16px;
        }
        .page-hero p {
            font-size: 18px;
            color: rgba(255,255,255,0.7);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.7;
        }

        /* ===== 通用区块 ===== */
        .section { padding: 100px 0; }
        .section-light { background: var(--light-gray); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
        .section-header { text-align: center; margin-bottom: 64px; }
        .section-tag {
            display: inline-block;
            color: var(--tech-blue);
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 0.05em;
            margin-bottom: 16px;
        }
        .section-title {
            font-size: 40px;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .section-desc {
            font-size: 18px;
            color: var(--text-mid);
            max-width: 640px;
            margin: 0 auto;
            line-height: 1.7;
        }

        /* ===== 三大业务 ===== */
        .business-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .business-card {
            background: white;
            border-radius: 16px;
            padding: 40px 32px;
            border: 1px solid var(--mid-gray);
            transition: all 0.3s;
        }
        .business-card:hover {
            border-color: var(--tech-blue);
            box-shadow: 0 12px 40px rgba(37, 99, 235, 0.1);
            transform: translateY(-4px);
        }
        .business-icon {
            width: 56px; height: 56px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
        }
        .business-icon.blue { background: rgba(37, 99, 235, 0.1); color: var(--tech-blue); }
        .business-icon.cyan { background: rgba(6, 182, 212, 0.1); color: var(--cyan); }
        .business-icon.indigo { background: rgba(99, 102, 241, 0.1); color: #6366F1; }
        .business-card h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 12px;
        }
        .business-card p {
            font-size: 15px;
            color: var(--text-mid);
            line-height: 1.7;
            margin-bottom: 20px;
        }
        .business-link {
            color: var(--tech-blue);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            cursor: pointer;
        }
        .business-link:hover { gap: 10px; }

        /* ===== 四大优势 ===== */
        .advantages-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
        }
        .advantage-item { text-align: center; padding: 20px; }
        .advantage-icon {
            width: 64px; height: 64px;
            margin: 0 auto 20px;
            background: rgba(37, 99, 235, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--tech-blue);
        }
        .advantage-item h4 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 12px;
        }
        .advantage-item p {
            font-size: 14px;
            color: var(--text-mid);
            line-height: 1.7;
        }

        /* ===== 服务流程 ===== */
        .process-steps {
            display: flex;
            justify-content: space-between;
            position: relative;
            margin-top: 40px;
        }
        .process-steps::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 10%;
            right: 10%;
            height: 2px;
            background: var(--mid-gray);
        }
        .process-step {
            text-align: center;
            position: relative;
            z-index: 1;
            flex: 1;
        }
        .step-number {
            width: 80px; height: 80px;
            margin: 0 auto 16px;
            background: white;
            border: 2px solid var(--tech-blue);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: 700;
            color: var(--tech-blue);
        }
        .process-step h4 { font-size: 16px; font-weight: 600; color: var(--text-dark); margin-bottom: 8px; }
        .process-step p { font-size: 13px; color: var(--text-mid); padding: 0 12px; }

        /* ===== 案例展示 ===== */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .case-card {
            background: white;
            border-radius: 16px;
            overflow: hidden;
            border: 1px solid var(--mid-gray);
        }
        .case-header {
            padding: 24px 28px;
            background: linear-gradient(135deg, #F0F7FF, #E0F2FE);
        }
        .case-tag {
            display: inline-block;
            background: var(--tech-blue);
            color: white;
            font-size: 12px;
            padding: 4px 12px;
            border-radius: 4px;
            margin-bottom: 12px;
        }
        .case-header h3 { font-size: 18px; font-weight: 600; color: var(--text-dark); }
        .case-body { padding: 28px; }
        .case-problem, .case-solution, .case-effect { margin-bottom: 20px; }
        .case-label { font-size: 13px; font-weight: 600; color: var(--text-light); margin-bottom: 6px; }
        .case-text { font-size: 14px; color: var(--text-mid); line-height: 1.7; }
        .case-effect .case-text { color: var(--tech-blue); font-weight: 500; }

        /* ===== CTA 区域 ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--tech-blue), var(--cyan));
            padding: 80px 0;
            text-align: center;
        }
        .cta-title { font-size: 36px; font-weight: 700; color: white; margin-bottom: 16px; }
        .cta-desc { font-size: 18px; color: rgba(255,255,255,0.9); margin-bottom: 32px; }
        .cta-btn {
            background: white;
            color: var(--tech-blue);
            padding: 16px 40px;
            border-radius: 10px;
            text-decoration: none;
            font-size: 16px;
            font-weight: 600;
            display: inline-block;
            transition: transform 0.2s;
            cursor: pointer;
            border: none;
        }
        .cta-btn:hover { transform: translateY(-2px); }

        /* ===== 关于我们 ===== */
        .about-content { max-width: 800px; margin: 0 auto; }
        .about-text { font-size: 17px; color: var(--text-mid); line-height: 1.9; margin-bottom: 32px; }
        .mission-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
            margin-top: 48px;
        }
        .mission-card {
            background: white;
            border-radius: 16px;
            padding: 40px;
            border: 1px solid var(--mid-gray);
            text-align: center;
        }
        .mission-card h3 { font-size: 20px; font-weight: 600; color: var(--text-dark); margin-bottom: 16px; }
        .mission-card p { font-size: 15px; color: var(--text-mid); line-height: 1.7; }

        /* ===== 解决方案详情 ===== */
        .solution-detail {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
            margin-top: 48px;
        }
        .solution-card {
            background: white;
            border-radius: 16px;
            padding: 36px;
            border: 1px solid var(--mid-gray);
        }
        .solution-card h3 {
            font-size: 22px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 16px;
            padding-bottom: 16px;
            border-bottom: 1px solid var(--mid-gray);
        }
        .solution-card .pain-point {
            background: #FEF2F2;
            padding: 16px;
            border-radius: 8px;
            margin-bottom: 20px;
        }
        .solution-card .pain-point h4 {
            font-size: 14px;
            color: #DC2626;
            margin-bottom: 8px;
        }
        .solution-card .pain-point p { font-size: 14px; color: var(--text-mid); line-height: 1.6; }
        .solution-card .solution { margin-bottom: 20px; }
        .solution-card .solution h4 {
            font-size: 14px;
            color: var(--tech-blue);
            margin-bottom: 8px;
        }
        .solution-card .solution p { font-size: 14px; color: var(--text-mid); line-height: 1.6; }
        .solution-card .deliverables { margin-bottom: 20px; }
        .solution-card .deliverables h4 {
            font-size: 14px;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .solution-card .deliverables ul { list-style: none; padding-left: 0; }
        .solution-card .deliverables li {
            font-size: 14px;
            color: var(--text-mid);
            padding: 6px 0;
            padding-left: 24px;
            position: relative;
        }
        .solution-card .deliverables li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: #22C55E;
            font-weight: bold;
        }

        /* ===== 产品定价 ===== */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 48px;
        }
        .pricing-card {
            background: white;
            border-radius: 16px;
            padding: 36px 28px;
            border: 1px solid var(--mid-gray);
            transition: all 0.3s;
        }
        .pricing-card:hover {
            border-color: var(--tech-blue);
            box-shadow: 0 12px 40px rgba(37, 99, 235, 0.1);
        }
        .pricing-card.featured {
            border: 2px solid var(--tech-blue);
            position: relative;
        }
        .pricing-card.featured::before {
            content: '推荐';
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--tech-blue);
            color: white;
            font-size: 12px;
            padding: 4px 16px;
            border-radius: 20px;
        }
        .pricing-icon {
            width: 56px; height: 56px;
            background: rgba(37, 99, 235, 0.1);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--tech-blue);
            margin-bottom: 20px;
        }
        .pricing-card h3 { font-size: 18px; font-weight: 600; color: var(--text-dark); margin-bottom: 8px; }
        .pricing-desc { font-size: 14px; color: var(--text-mid); margin-bottom: 20px; line-height: 1.6; }
        .pricing-price { font-size: 32px; font-weight: 700; color: var(--tech-blue); margin-bottom: 20px; }
        .pricing-price span { font-size: 14px; font-weight: 400; color: var(--text-light); }
        .pricing-features { list-style: none; padding: 0; margin-bottom: 24px; }
        .pricing-features li {
            font-size: 14px;
            color: var(--text-mid);
            padding: 8px 0;
            padding-left: 24px;
            position: relative;
        }
        .pricing-features li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: #22C55E;
            font-weight: bold;
        }

        /* ===== 联系我们 ===== */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            margin-top: 48px;
        }
        .contact-form {
            background: white;
            border-radius: 16px;
            padding: 40px;
            border: 1px solid var(--mid-gray);
        }
        .form-group { margin-bottom: 24px; }
        .form-group label {
            display: block;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .form-group input, .form-group textarea, .form-group select {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--mid-gray);
            border-radius: 8px;
            font-size: 15px;
            color: var(--text-dark);
            font-family: inherit;
        }
        .form-group input:focus, .form-group textarea:focus, .form-group select:focus {
            outline: none;
            border-color: var(--tech-blue);
        }
        .form-group textarea { resize: vertical; min-height: 120px; }
        .form-notice {
            display: none;
            margin-top: 20px;
            padding: 18px 20px;
            background: rgba(37, 99, 235, 0.06);
            border: 1px solid var(--tech-blue);
            border-radius: 12px;
            font-size: 14px;
            line-height: 1.8;
            color: var(--text-mid);
        }
        .form-notice.show { display: block; }
        .form-notice strong { display: block; margin-bottom: 6px; font-size: 15px; color: var(--text-dark); }
        .form-notice p { margin: 0; }
        .form-notice a { color: var(--tech-blue); font-weight: 600; }
        .contact-info h3 { font-size: 22px; font-weight: 600; color: var(--text-dark); margin-bottom: 24px; }
        .contact-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            margin-bottom: 24px;
        }
        .contact-item-icon {
            width: 48px; height: 48px;
            background: rgba(37, 99, 235, 0.1);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--tech-blue);
            flex-shrink: 0;
        }
        .contact-item h4 { font-size: 15px; font-weight: 600; color: var(--text-dark); margin-bottom: 4px; }
        .contact-item p { font-size: 14px; color: var(--text-mid); line-height: 1.6; }
        .contact-qr {
            margin-top: 8px;
            background: white;
            border: 1px solid var(--mid-gray);
            border-radius: 16px;
            padding: 28px 24px;
            text-align: center;
        }
        .contact-qr img {
            display: block;
            width: 200px;
            max-width: 100%;
            height: auto;
            margin: 0 auto;
        }
        .contact-qr.highlight {
            border-color: var(--tech-blue);
            box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
        }

        /* ===== FAQ ===== */
        .contact-faq { margin-top: 64px; }
        .contact-faq-title {
            font-size: 22px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 24px;
        }
        .faq-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .faq-item {
            background: white;
            border-radius: 12px;
            padding: 24px 28px;
            border: 1px solid var(--mid-gray);
        }
        .faq-item h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 12px;
        }
        .faq-item p { font-size: 15px; color: var(--text-mid); line-height: 1.7; }

        /* ===== Footer ===== */
        .footer {
            background: #0F172A;
            padding: 60px 0 30px;
            color: rgba(255,255,255,0.7);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 40px;
        }
        .footer-logo { display: block; width: 200px; max-width: 100%; height: auto; margin-bottom: 16px; }
        .footer-brand p { font-size: 14px; line-height: 1.7; }
        .footer-col h4 { font-size: 15px; font-weight: 600; color: white; margin-bottom: 16px; }
        .footer-col ul { list-style: none; }
        .footer-col li { margin-bottom: 10px; }
        .footer-col a {
            color: rgba(255,255,255,0.6);
            text-decoration: none;
            font-size: 14px;
            transition: color 0.2s;
            cursor: pointer;
        }
        .footer-col a:hover { color: white; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 24px;
            text-align: center;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s;
        }
        .footer-bottom a:hover { color: rgba(255,255,255,0.85); text-decoration: underline; }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .business-grid, .solution-detail, .contact-grid { grid-template-columns: repeat(2, 1fr); }
            .advantages-grid, .pricing-grid, .faq-list { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .nav-menu { display: none; }
            .mobile-menu-btn { display: block; color: white; font-size: 24px; background: none; border: none; cursor: pointer; }
            .hero h1, .page-hero h1 { font-size: 32px; }
            .hero-subtitle { font-size: 16px; }
            .hero-stats { flex-wrap: wrap; gap: 24px; }
            .section { padding: 60px 0; }
            .section-title { font-size: 28px; }
            .business-grid, .solution-detail, .contact-grid, .mission-grid { grid-template-columns: 1fr; }
            .advantages-grid, .pricing-grid { grid-template-columns: 1fr; }
            .case-grid { grid-template-columns: 1fr; }
            .faq-list { grid-template-columns: 1fr; }
            .process-steps { flex-direction: column; gap: 32px; }
            .process-steps::before { display: none; }
            .footer-grid { grid-template-columns: 1fr; }
        }

        /* ===== 移动端导航展开（≤768px，绝对定位基于 position:fixed 的 .navbar） ===== */
        @media (max-width: 768px) {
            .nav-menu.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 100%; left: 0; right: 0;
                background: rgba(10, 22, 40, 0.98);
                backdrop-filter: blur(10px);
                padding: 8px 24px 16px;
                gap: 0;
                box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
            }
            .nav-menu.open li { border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
            .nav-menu.open li:last-child { border-bottom: none; }
            .nav-menu.open a { display: block; padding: 14px 0; font-size: 16px; }
        }