/* ========== 全局重置与基础变量 ========== */
        :root {
            --primary: #1a56db;
            --primary-dark: #143ea8;
            --primary-light: #3b82f6;
            --accent: #06b6d4;
            --dark: #0f172a;
            --dark-2: #1e293b;
            --gray-50: #f8fafc;
            --gray-100: #f1f5f9;
            --gray-200: #e2e8f0;
            --gray-300: #cbd5e1;
            --gray-500: #64748b;
            --gray-600: #475569;
            --gray-700: #334155;
            --white: #ffffff;
            --gradient: linear-gradient(135deg, #1a56db 0%, #06b6d4 100%);
            --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
            --shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.1), 0 2px 4px -2px rgba(15, 23, 42, 0.06);
            --shadow-lg: 0 10px 30px -3px rgba(15, 23, 42, 0.12), 0 4px 6px -4px rgba(15, 23, 42, 0.08);
            --shadow-xl: 0 20px 50px -12px rgba(15, 23, 42, 0.18);
            --radius: 12px;
            --radius-lg: 20px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--dark);
            background: var(--white);
            line-height: 1.6;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        ul {
            list-style: none;
        }

        img {
            max-width: 100%;
            display: block;
        }

        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        section {
            padding: 100px 0;
        }

        /* ========== 通用标题 ========== */
        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .section-tag {
            display: inline-block;
            padding: 6px 18px;
            background: rgba(26, 86, 219, 0.08);
            color: var(--primary);
            font-size: 14px;
            font-weight: 600;
            border-radius: 100px;
            margin-bottom: 16px;
            letter-spacing: 1px;
        }

        .section-title {
            font-size: 36px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .section-subtitle {
            font-size: 17px;
            color: var(--gray-500);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.8;
        }

        /* ========== 导航栏 ========== */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--gray-200);
            transition: var(--transition);
        }

        .navbar.scrolled {
            box-shadow: var(--shadow-sm);
        }

        .nav-container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 72px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 19px;
            font-weight: 800;
            color: var(--dark);
            letter-spacing: -0.3px;
        }

        .nav-logo-icon {
            min-width: 64px;
            height: 40px;
            padding: 0 12px;
            background: var(--gradient);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 18px;
            font-weight: 900;
            letter-spacing: -1px;
            box-shadow: 0 4px 12px rgba(26, 86, 219, 0.3);
        }

        .nav-menu {
            display: flex;
            gap: 36px;
            align-items: center;
        }

        .nav-menu a {
            font-size: 15px;
            font-weight: 500;
            color: var(--gray-700);
            transition: var(--transition);
            position: relative;
        }

        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transition: var(--transition);
        }

        .nav-menu a:hover {
            color: var(--primary);
        }

        .nav-menu a:hover::after {
            width: 100%;
        }

        .nav-cta {
            padding: 10px 24px;
            background: var(--primary);
            color: white !important;
            border-radius: 8px;
            font-weight: 600;
            font-size: 14px;
            transition: var(--transition);
        }

        .nav-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(26, 86, 219, 0.35);
        }

        .nav-cta::after {
            display: none;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 6px;
        }

        .nav-toggle span {
            width: 24px;
            height: 2px;
            background: var(--dark);
            border-radius: 2px;
            transition: var(--transition);
        }

        /* ========== Hero 区域 ========== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding-top: 72px;
            background: var(--gradient-dark);
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 700px;
            height: 700px;
            background: radial-gradient(circle, rgba(26, 86, 219, 0.25) 0%, transparent 70%);
            border-radius: 50%;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -10%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, transparent 70%);
            border-radius: 50%;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            width: 100%;
        }

        .hero-text h1 {
            font-size: 48px;
            font-weight: 900;
            line-height: 1.2;
            color: white;
            margin-bottom: 24px;
            letter-spacing: -1px;
        }

        .hero-text h1 .hero-company {
            display: block;
            font-size: 15px;
            font-weight: 600;
            letter-spacing: 2px;
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: 16px;
        }

        .hero-text h1 .highlight {
            background: linear-gradient(135deg, #60a5fa, #22d3ee);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-text p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.9;
            margin-bottom: 36px;
            max-width: 520px;
        }

        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: var(--primary);
            color: white;
            border-radius: 10px;
            font-weight: 600;
            font-size: 16px;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(26, 86, 219, 0.4);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: transparent;
            color: white;
            border: 2px solid rgba(255, 255, 255, 0.25);
            border-radius: 10px;
            font-weight: 600;
            font-size: 16px;
            transition: var(--transition);
            cursor: pointer;
        }

        .btn-outline:hover {
            border-color: white;
            background: rgba(255, 255, 255, 0.08);
        }

        /* Hero 右侧视觉区 —— 双列错落（flex 自动排列，无需绝对定位） */
        .hero-visual {
            position: relative;
            display: flex;
            gap: 22px;
            align-items: flex-start;
        }

        .hero-col {
            display: flex;
            flex-direction: column;
            gap: 22px;
            flex: 1 1 0;
            min-width: 0;
        }

        /* 右列整体下沉，形成错落节奏 */
        .hero-col-offset {
            margin-top: 54px;
        }

        .hero-card {
            background: rgba(255, 255, 255, 0.06);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-lg);
            padding: 24px 26px;
            transition: var(--transition);
        }

        .hero-card:hover {
            border-color: rgba(96, 165, 250, 0.4);
            background: rgba(255, 255, 255, 0.09);
            transform: translateY(-4px);
        }

        .hero-card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 16px;
        }

        .hero-card-icon.blue { background: rgba(59, 130, 246, 0.2); }
        .hero-card-icon.cyan { background: rgba(6, 182, 212, 0.2); }
        .hero-card-icon.purple { background: rgba(139, 92, 246, 0.2); }
        .hero-card-icon.green { background: rgba(16, 185, 129, 0.2); }
        .hero-card-icon.orange { background: rgba(245, 158, 11, 0.2); }

        .hero-card h4 {
            color: white;
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .hero-card p {
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
            line-height: 1.6;
        }

        /* Hero 底部统计数据 */
        .hero-stats {
            display: flex;
            gap: 48px;
            margin-top: 48px;
            padding-top: 36px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }

        .hero-stat-num {
            font-size: 36px;
            font-weight: 900;
            color: white;
            line-height: 1;
        }

        .hero-stat-num .plus {
            color: var(--accent);
        }

        .hero-stat-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            margin-top: 6px;
        }

        /* ========== 关于我们 ========== */
        .about {
            background: var(--white);
        }

        .about-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .about-text h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 24px;
            line-height: 1.3;
        }

        .about-text p {
            color: var(--gray-600);
            font-size: 16px;
            line-height: 1.9;
            margin-bottom: 20px;
        }

        .about-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin-top: 32px;
        }

        .about-feature {
            display: flex;
            align-items: flex-start;
            gap: 14px;
        }

        .about-feature-icon {
            width: 44px;
            height: 44px;
            background: rgba(26, 86, 219, 0.08);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 20px;
        }

        .about-feature h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 4px;
        }

        .about-feature p {
            font-size: 14px;
            color: var(--gray-500);
            margin: 0;
        }

        /* 关于我们 - 右侧视觉 */
        .about-visual {
            position: relative;
        }

        .about-img-card {
            background: var(--gradient);
            border-radius: var(--radius-lg);
            padding: 48px;
            color: white;
            position: relative;
            overflow: hidden;
        }

        .about-img-card::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -30%;
            width: 400px;
            height: 400px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 50%;
        }

        .about-img-card h3 {
            font-size: 22px;
            font-weight: 800;
            margin-bottom: 24px;
            position: relative;
        }

        .about-list {
            position: relative;
        }

        .about-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 14px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.12);
            font-size: 15px;
        }

        .about-list li:last-child {
            border-bottom: none;
        }

        .about-list-check {
            width: 24px;
            height: 24px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 14px;
        }

        /* ========== 业务领域 ========== */
        .services {
            background: var(--gray-50);
        }

        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .service-card {
            background: white;
            border-radius: var(--radius-lg);
            padding: 36px 30px;
            transition: var(--transition);
            border: 1px solid var(--gray-200);
            position: relative;
            overflow: hidden;
        }

        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--gradient);
            transform: scaleX(0);
            transform-origin: left;
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-xl);
            border-color: transparent;
        }

        .service-card:hover::before {
            transform: scaleX(1);
        }

        .service-icon {
            width: 60px;
            height: 60px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            margin-bottom: 24px;
            transition: var(--transition);
        }

        .service-card:hover .service-icon {
            transform: scale(1.1) rotate(-5deg);
        }

        .service-icon.bg-blue { background: linear-gradient(135deg, #dbeafe, #bfdbfe); }
        .service-icon.bg-cyan { background: linear-gradient(135deg, #cffafe, #a5f3fc); }
        .service-icon.bg-purple { background: linear-gradient(135deg, #ede9fe, #ddd6fe); }
        .service-icon.bg-green { background: linear-gradient(135deg, #dcfce7, #bbf7d0); }
        .service-icon.bg-orange { background: linear-gradient(135deg, #ffedd5, #fed7aa); }
        .service-icon.bg-pink { background: linear-gradient(135deg, #fce7f3, #fbcfe8); }

        .service-card h3 {
            font-size: 20px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 12px;
        }

        .service-card p {
            font-size: 15px;
            color: var(--gray-500);
            line-height: 1.7;
            margin-bottom: 20px;
        }

        .service-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .service-tag {
            padding: 4px 12px;
            background: var(--gray-100);
            color: var(--gray-600);
            font-size: 13px;
            border-radius: 6px;
            font-weight: 500;
        }

        /* ========== 解决方案 ========== */
        .solutions {
            background: var(--white);
        }

        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .solution-card {
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition);
            position: relative;
            display: flex;
            flex-direction: column;
        }

        .solution-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-xl);
        }

        .solution-header {
            height: 140px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        .solution-header.bg-1 { background: linear-gradient(135deg, #1a56db, #3b82f6); }
        .solution-header.bg-2 { background: linear-gradient(135deg, #0f766e, #06b6d4); }
        .solution-header.bg-3 { background: linear-gradient(135deg, #6d28d9, #8b5cf6); }
        .solution-header.bg-4 { background: linear-gradient(135deg, #b91c1c, #ef4444); }

        .solution-header svg {
            width: 64px;
            height: 64px;
            color: rgba(255, 255, 255, 0.9);
        }

        .solution-header::after {
            content: '';
            position: absolute;
            bottom: -20px;
            right: -20px;
            width: 120px;
            height: 120px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 50%;
        }

        .solution-body {
            background: white;
            border: 1px solid var(--gray-200);
            border-top: none;
            padding: 28px;
            border-radius: 0 0 var(--radius-lg) var(--radius-lg);
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .solution-body h3 {
            font-size: 19px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 12px;
        }

        .solution-body p {
            font-size: 14px;
            color: var(--gray-500);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .solution-points {
            display: flex;
            flex-direction: column;
            gap: 8px;
            margin-top: auto;
        }

        .solution-point {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--gray-600);
        }

        .solution-point::before {
            content: '';
            width: 6px;
            height: 6px;
            background: var(--primary);
            border-radius: 50%;
            flex-shrink: 0;
        }

        /* ========== 技术优势 ========== */
        .advantages {
            background: var(--gradient-dark);
            color: white;
            position: relative;
            overflow: hidden;
        }

        .advantages::before {
            content: '';
            position: absolute;
            top: 20%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(26, 86, 219, 0.15) 0%, transparent 70%);
            border-radius: 50%;
        }

        .advantages .section-title {
            color: white;
        }

        .advantages .section-subtitle {
            color: rgba(255, 255, 255, 0.6);
        }

        .advantages .section-tag {
            background: rgba(96, 165, 250, 0.15);
            color: #93c5fd;
        }

        .advantages-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
            z-index: 2;
        }

        .advantage-card {
            text-align: center;
            padding: 36px 20px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius);
            transition: var(--transition);
        }

        .advantage-card:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(96, 165, 250, 0.3);
            transform: translateY(-4px);
        }

        .advantage-icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 20px;
            background: rgba(96, 165, 250, 0.15);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
        }

        .advantage-card h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .advantage-card p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            line-height: 1.7;
        }

        /* ========== 成功案例 ========== */
        .cases {
            background: var(--gray-50);
        }

        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .case-card {
            background: white;
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition);
            border: 1px solid var(--gray-200);
        }

        .case-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-xl);
        }

        .case-image {
            height: 200px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 56px;
            position: relative;
            overflow: hidden;
        }

        .case-image.bg-blue { background: linear-gradient(135deg, #dbeafe, #93c5fd); }
        .case-image.bg-green { background: linear-gradient(135deg, #dcfce7, #86efac); }
        .case-image.bg-purple { background: linear-gradient(135deg, #ede9fe, #c4b5fd); }
        .case-image.bg-orange { background: linear-gradient(135deg, #ffedd5, #fdba74); }
        .case-image.bg-pink { background: linear-gradient(135deg, #fce7f3, #f9a8d4); }
        .case-image.bg-cyan { background: linear-gradient(135deg, #cffafe, #67e8f9); }
        .case-image.bg-indigo { background: linear-gradient(135deg, #e0e7ff, #a5b4fc); }
        .case-image.bg-amber { background: linear-gradient(135deg, #fef3c7, #fcd34d); }
        .case-image.bg-teal { background: linear-gradient(135deg, #ccfbf1, #5eead4); }

        .case-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0) 0%, rgba(15, 23, 42, 0.15) 100%);
        }

        .case-body {
            padding: 28px;
        }

        .case-category {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(26, 86, 219, 0.08);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            border-radius: 6px;
            margin-bottom: 12px;
        }

        .case-body h3 {
            font-size: 18px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 10px;
        }

        .case-body p {
            font-size: 14px;
            color: var(--gray-500);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .case-results {
            display: flex;
            gap: 20px;
            padding-top: 16px;
            border-top: 1px solid var(--gray-200);
        }

        .case-result-num {
            font-size: 22px;
            font-weight: 900;
            color: var(--primary);
        }

        .case-result-label {
            font-size: 12px;
            color: var(--gray-500);
        }

        /* 案例 Tab 切换 */
        .case-tabs {
            display: flex;
            justify-content: center;
            gap: 12px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }

        .case-tab {
            padding: 12px 28px;
            background: white;
            border: 1px solid var(--gray-200);
            border-radius: 100px;
            cursor: pointer;
            font-size: 15px;
            font-weight: 600;
            color: var(--gray-600);
            transition: var(--transition);
            font-family: inherit;
        }

        .case-tab:hover {
            border-color: var(--primary);
            color: var(--primary);
        }

        .case-tab.active {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
            box-shadow: 0 6px 20px rgba(26, 86, 219, 0.3);
        }

        .case-tab-num {
            display: inline-block;
            margin-left: 6px;
            font-size: 13px;
            opacity: 0.7;
        }

        .case-panel {
            display: none;
        }

        .case-panel.active {
            display: block;
        }

        .case-panel-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        /* 最后一行只有1张时单独居中 */
        .case-panel-grid > .case-card:last-child:nth-child(3n+1) {
            grid-column: 2 / 3;
        }

        /* 最后一行只有2张时，最后一张移到第3列，形成对称 */
        .case-panel-grid > .case-card:last-child:nth-child(3n+2) {
            grid-column: 3 / 4;
        }

        /* ========== 联系我们 ========== */
        .contact {
            background: var(--white);
        }

        .contact-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: start;
        }

        .contact-info h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 20px;
        }

        .contact-info > p {
            color: var(--gray-600);
            font-size: 16px;
            line-height: 1.8;
            margin-bottom: 36px;
        }

        .contact-items {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .contact-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
        }

        .contact-item-icon {
            width: 50px;
            height: 50px;
            background: rgba(26, 86, 219, 0.08);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 22px;
        }

        .contact-item h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 4px;
        }

        .contact-item p {
            font-size: 15px;
            color: var(--gray-500);
        }

        /* 联系表单 */
        .contact-form {
            background: var(--gray-50);
            border-radius: var(--radius-lg);
            padding: 40px;
            border: 1px solid var(--gray-200);
        }

        .contact-form h3 {
            font-size: 22px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 24px;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            color: var(--gray-700);
            margin-bottom: 8px;
        }

        .form-group input,
        .form-group select,
        .form-group textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1.5px solid var(--gray-200);
            border-radius: 10px;
            font-size: 15px;
            font-family: inherit;
            color: var(--dark);
            background: white;
            transition: var(--transition);
            outline: none;
        }

        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
        }

        .form-group textarea {
            resize: vertical;
            min-height: 100px;
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }

        .form-submit {
            width: 100%;
            padding: 14px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 16px;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
        }

        .form-submit:hover {
            background: var(--primary-dark);
            box-shadow: 0 8px 24px rgba(26, 86, 219, 0.35);
        }

        /* ========== 页脚 ========== */
        .footer {
            background: var(--dark);
            color: rgba(255, 255, 255, 0.6);
            padding: 60px 0 0;
        }

        .footer-content {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 48px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .footer-brand {
            font-size: 20px;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }

        .footer-brand-icon {
            width: 36px;
            height: 36px;
            background: var(--gradient);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 900;
        }

        .footer-brand-desc {
            font-size: 14px;
            line-height: 1.8;
            max-width: 320px;
        }

        .footer-col h4 {
            color: white;
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .footer-col a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            transition: var(--transition);
        }

        .footer-col a:hover {
            color: var(--accent);
        }

        .footer-bottom {
            padding: 24px 0;
            text-align: center;
            font-size: 14px;
        }

        .footer-bottom p {
            color: rgba(255, 255, 255, 0.5);
            line-height: 1.8;
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
            transition: var(--transition);
        }

        .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ========== 滚动动画 ========== */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }

        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ========== 返回顶部 ========== */
        .back-to-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 48px;
            height: 48px;
            background: var(--primary);
            color: white;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
            border: none;
            box-shadow: var(--shadow-lg);
        }

        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1024px) {
            .hero-content {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .hero-visual {
                display: none;
            }
            .hero-text h1 {
                font-size: 38px;
            }
            .about-content {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .services-grid,
            .solutions-grid,
            .cases-grid,
            .case-panel-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .advantages-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-content {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 768px) {
            section {
                padding: 60px 0;
            }
            .nav-menu {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                right: 0;
                background: white;
                flex-direction: column;
                padding: 24px;
                gap: 16px;
                box-shadow: var(--shadow-lg);
                border-bottom: 1px solid var(--gray-200);
            }
            .nav-menu.active {
                display: flex;
            }
            .nav-toggle {
                display: flex;
            }
            .section-title {
                font-size: 28px;
            }
            .hero-text h1 {
                font-size: 30px;
            }
            .hero-text p {
                font-size: 16px;
            }
            .hero-stats {
                gap: 24px;
                flex-wrap: wrap;
            }
            .hero-stat-num {
                font-size: 28px;
            }
            .about-features {
                grid-template-columns: 1fr;
            }
            .services-grid,
            .solutions-grid,
            .cases-grid,
            .advantages-grid {
                grid-template-columns: 1fr;
            }
            .contact-content {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .form-row {
                grid-template-columns: 1fr;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
            .contact-form {
                padding: 24px;
            }
        }

        /* ========== 安全区域适配（刘海屏/底部横条） ========== */
        .safe-area-bottom {
            padding-bottom: env(safe-area-inset-bottom, 0px);
        }

        /* ========== 微信公众号关注区块 ========== */
        .wechat-section {
            background: var(--gray-50);
        }

        .wechat-card {
            display: grid;
            grid-template-columns: 1fr auto;
            gap: 40px;
            align-items: center;
            background: white;
            border-radius: var(--radius-lg);
            padding: 48px;
            border: 1px solid var(--gray-200);
            box-shadow: var(--shadow);
        }

        .wechat-card-text h3 {
            font-size: 24px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 14px;
        }

        .wechat-card-text p {
            font-size: 15px;
            color: var(--gray-500);
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .wechat-card-features {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .wechat-card-feature {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            background: rgba(26, 86, 219, 0.06);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            border-radius: 100px;
        }

        .wechat-qr {
            text-align: center;
            flex-shrink: 0;
        }

        .wechat-qr-img {
            width: 160px;
            height: 160px;
            background: white;
            border: 2px solid var(--gray-200);
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 12px;
            position: relative;
            overflow: hidden;
        }

        .wechat-qr-img svg,
        .wechat-qr-img img {
            width: 100%;
            height: 100%;
            display: block;
            object-fit: contain;
        }

        .wechat-qr-label {
            font-size: 13px;
            color: var(--gray-600);
            font-weight: 600;
        }

        .wechat-qr-sub {
            font-size: 12px;
            color: var(--gray-500);
            margin-top: 4px;
        }

        /* ========== 微信二维码弹窗 ========== */
        .qr-modal {
            position: fixed;
            inset: 0;
            background: rgba(15, 23, 42, 0.75);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            z-index: 2000;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s ease, visibility 0.3s ease;
            padding: 24px;
        }

        .qr-modal.show {
            opacity: 1;
            visibility: visible;
        }

        .qr-modal-content {
            background: white;
            border-radius: var(--radius-lg);
            padding: 40px 36px;
            text-align: center;
            max-width: 340px;
            width: 100%;
            transform: scale(0.9);
            transition: transform 0.3s ease;
        }

        .qr-modal.show .qr-modal-content {
            transform: scale(1);
        }

        .qr-modal-close {
            position: absolute;
            top: 16px;
            right: 16px;
            width: 32px;
            height: 32px;
            background: var(--gray-100);
            border: none;
            border-radius: 50%;
            font-size: 18px;
            cursor: pointer;
            color: var(--gray-600);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }

        .qr-modal-close:hover {
            background: var(--gray-200);
        }

        .qr-modal-icon {
            width: 56px;
            height: 56px;
            background: #07c160;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            margin: 0 auto 20px;
            color: white;
        }

        .qr-modal h3 {
            font-size: 20px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 8px;
        }

        .qr-modal p {
            font-size: 14px;
            color: var(--gray-500);
            margin-bottom: 24px;
        }

        .qr-modal-qr {
            width: 200px;
            height: 200px;
            margin: 0 auto 20px;
            border: 2px solid var(--gray-200);
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
            background: white;
        }

        .qr-modal-qr img {
            width: 100%;
            height: 100%;
            display: block;
            object-fit: contain;
        }

        .qr-modal-qr svg {
            width: 100%;
            height: 100%;
        }

        .qr-modal-tip {
            font-size: 13px;
            color: var(--gray-500);
        }

        /* ========== 表单提交成功弹窗（与 qr-modal 同款视觉） ========== */
        .success-modal {
            position: fixed;
            inset: 0;
            background: rgba(15, 23, 42, 0.75);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            z-index: 2000;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s ease, visibility 0.3s ease;
            padding: 24px;
        }

        .success-modal.show {
            opacity: 1;
            visibility: visible;
        }

        .success-modal-content {
            background: white;
            border-radius: var(--radius-lg);
            padding: 40px 36px 32px;
            text-align: center;
            max-width: 380px;
            width: 100%;
            transform: scale(0.9);
            transition: transform 0.3s ease;
            position: relative;
        }

        .success-modal.show .success-modal-content {
            transform: scale(1);
        }

        .success-modal-close {
            position: absolute;
            top: 14px;
            right: 14px;
            width: 32px;
            height: 32px;
            background: var(--gray-100);
            border: none;
            border-radius: 50%;
            font-size: 18px;
            cursor: pointer;
            color: var(--gray-600);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }

        .success-modal-close:hover {
            background: var(--gray-200);
        }

        .success-modal-icon {
            width: 64px;
            height: 64px;
            background: #07c160;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 32px;
            margin: 0 auto 20px;
            color: white;
            box-shadow: 0 8px 24px rgba(7, 193, 96, 0.35);
        }

        .success-modal h3 {
            font-size: 20px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 12px;
        }

        .success-modal p {
            font-size: 15px;
            color: var(--gray-600);
            margin-bottom: 24px;
            line-height: 1.7;
        }

        .success-modal .wx-id {
            display: inline-block;
            margin: 0 4px;
            padding: 2px 10px;
            background: #07c160;
            color: #fff;
            border-radius: 6px;
            font-weight: 700;
            font-size: 15px;
            letter-spacing: 1px;
            cursor: pointer;
            user-select: all;
        }

        .success-modal-btn {
            display: inline-block;
            padding: 12px 40px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }

        .success-modal-btn:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: 0 8px 20px rgba(26, 86, 219, 0.3);
        }

        .success-modal-btn:active {
            transform: translateY(0);
        }

        /* ========== 手机底部快捷操作栏 ========== */
        .mobile-action-bar {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: white;
            border-top: 1px solid var(--gray-200);
            z-index: 999;
            padding: 8px 0;
            padding-bottom: calc(8px + env(safe-area-inset-bottom, 0px));
            box-shadow: 0 -4px 20px rgba(15, 23, 42, 0.08);
        }

        .mobile-action-bar-inner {
            display: flex;
            max-width: 600px;
            margin: 0 auto;
            padding: 0 12px;
        }

        .mobile-action-btn {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            padding: 8px 4px;
            border: none;
            background: none;
            cursor: pointer;
            transition: var(--transition);
            min-height: 52px;
        }

        .mobile-action-btn span:first-child {
            font-size: 22px;
            line-height: 1;
        }

        .mobile-action-btn span:last-child {
            font-size: 11px;
            color: var(--gray-600);
            font-weight: 500;
        }

        .mobile-action-btn.call span:last-child {
            color: #07c160;
        }

        .mobile-action-btn.wechat span:last-child {
            color: #07c160;
        }

        .mobile-action-btn.consult {
            flex: 1.5;
            background: var(--primary);
            border-radius: 10px;
            margin: 4px 8px;
        }

        .mobile-action-btn.consult span:last-child {
            color: white;
            font-size: 14px;
            font-weight: 700;
        }

        .mobile-action-btn.consult span:first-child {
            display: none;
        }

        /* ========== 微信浏览器内特殊样式 ========== */
        body.is-wechat .nav-toggle span {
            background: var(--dark);
        }

        /* ========== 移动端触摸优化 ========== */
        @media (max-width: 768px) {
            /* 所有可点击元素最小触摸目标 44px */
            .nav-menu a {
                min-height: 48px;
                display: flex;
                align-items: center;
            }

            .nav-cta {
                width: 100%;
                text-align: center;
                justify-content: center;
            }

            /* 表单输入框防止 iOS 自动缩放 */
            .form-group input,
            .form-group select,
            .form-group textarea {
                font-size: 16px;
            }

            /* Hero 区优化 */
            .hero {
                min-height: auto;
                padding-top: 100px;
                padding-bottom: 40px;
            }

            .hero-buttons {
                width: 100%;
            }

            .hero-buttons .btn-primary,
            .hero-buttons .btn-outline {
                flex: 1;
                justify-content: center;
                padding: 14px 20px;
                font-size: 15px;
            }

            .hero-stats {
                gap: 16px 24px;
                justify-content: space-between;
            }

            .hero-stat-num {
                font-size: 24px;
            }

            /* 微信公众号卡片 */
            .wechat-card {
                grid-template-columns: 1fr;
                gap: 24px;
                padding: 28px 20px;
                text-align: center;
            }

            .wechat-qr {
                margin: 0 auto;
            }

            .wechat-card-features {
                justify-content: center;
            }

            /* 卡片间距缩小 */
            .service-card,
            .solution-body,
            .case-body {
                padding: 24px 20px;
            }

            /* 导航 logo 缩小 */
            .nav-logo span {
                font-size: 16px;
            }

            .nav-logo-icon {
                min-width: 56px;
                height: 34px;
                padding: 0 10px;
                font-size: 15px;
                letter-spacing: -1px;
                border-radius: 8px;
            }

            /* 页脚优化 */
            .footer {
                padding-bottom: 80px;
            }

            .footer-bottom p {
                font-size: 12px;
            }

            /* 返回顶部按钮上移避开底部栏 */
            .back-to-top {
                bottom: 80px;
                right: 16px;
                width: 42px;
                height: 42px;
            }

            /* 显示底部操作栏 */
            .mobile-action-bar {
                display: block;
            }
        }

        /* ========== 超小屏适配 (480px以下) ========== */
        @media (max-width: 480px) {
            .container {
                padding: 0 16px;
            }

            section {
                padding: 48px 0;
            }

            .section-title {
                font-size: 24px;
            }

            .section-subtitle {
                font-size: 14px;
            }

            .hero-text h1 {
                font-size: 26px;
            }

            .hero-text p {
                font-size: 15px;
            }

            .hero-buttons {
                flex-direction: column;
            }

            .hero-buttons .btn-primary,
            .hero-buttons .btn-outline {
                width: 100%;
            }

            .hero-stats {
                grid-template-columns: 1fr 1fr;
                display: grid;
                gap: 20px;
            }

            .about-text h2 {
                font-size: 26px;
            }

            .contact-info h2 {
                font-size: 26px;
            }

            .contact-form {
                padding: 20px 16px;
            }

            .wechat-card {
                padding: 24px 16px;
            }

            .wechat-card-text h3 {
                font-size: 20px;
            }

            .service-card,
            .solution-body,
            .case-body {
                padding: 20px 16px;
            }
        }