:root {
        --primary: #3b82f6;
        --primary-light: #60a5fa;
        --primary-dark: #2563eb;
        --secondary: #8b5cf6;
        --accent: #06b6d4;
        --accent-light: #22d3ee;
        --light: #f8fafc;
        --light-gray: #f1f5f9;
        --medium-gray: #e2e8f0;
        --dark-gray: #64748b;
        --dark: #1e293b;
        --accent-color: #1e40af;
        --gradient-primary: linear-gradient(135deg, #3b82f6, #8b5cf6);
        --gradient-accent: linear-gradient(135deg, #06b6d4, #3b82f6);
        --gradient-light: linear-gradient(135deg, #f8fafc, #e2e8f0);
        --shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
        --shadow-hover: 0 30px 60px rgba(0, 0, 0, 0.12);
        --shadow-light: 0 10px 20px rgba(0, 0, 0, 0.05);
        --border-radius: 20px;
        --border-radius-lg: 30px;
        --transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.1);
        --transition-fast: all 0.25s ease;
    }




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

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

    body {
        font-family: 'Inter', sans-serif;
        color: var(--dark);
        overflow-x: hidden;
        line-height: 1.7;
    }

    h1,
    h2,
    h3,
    h4,
    h5,
    h6 {
        font-family: 'Poppins', sans-serif;
        font-weight: 700;
        line-height: 1.2;
        letter-spacing: -0.01em;
    }

    .logo-color {
        background: linear-gradient(135deg, #EF841A, rgba(246, 164, 95));
        -webkit-background-clip: text;
        background-clip: text;
        color: transparent;
    }

    /* 全局间距调整 */
    section {
        overflow: hidden;
    }

    .bg-primary-change {
        background: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 50%, #8b5cf6 100%);
    }

    .rounded {
        border-radius: var(--border-radius) !important;
    }

    #about .item {
        width: 45px;
        height: 45px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .ai-agent .title {
        color: var(--dark-text);
        font-weight: 700;
        margin-bottom: 1rem;
        position: relative;
    }


    .ai-agent .subtitle {
        color: var(--light-text);
        font-size: 1.1rem;
        margin-bottom: 2.5rem;
    }

    .ai-agent .ai-agent-card {
        background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
        border: none;
        padding: 2rem;
        margin-top: 1rem;
    }

    .ai-agent .ai-agent-card .tech-stack-badge {
        background-color: #e0f2fe;
        color: var(--accent-color);
        padding: 0.4rem 0.8rem;
        border-radius: 50px;
        font-size: 0.85rem;
        margin-right: 0.5rem;
        margin-bottom: 0.5rem;
        display: inline-block;
        border: 1px solid #bae6fd;
    }

    .ai-agent .ai-agent-card .feature-icon {
        width: 50px;
        height: 50px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.3rem;
        color: white;
        background-color: var(--primary);
    }

    .ai-agent .timeline-item {
        position: relative;
        padding-left: 2rem;
        padding-bottom: 2rem;
    }

    .ai-agent .timeline-item:before {
        content: '';
        position: absolute;
        left: 0;
        top: 0.3rem;
        width: 12px;
        height: 12px;
        border-radius: 50%;
        background-color: var(--primary);
    }

    .ai-agent .timeline-item:after {
        content: '';
        position: absolute;
        left: 5px;
        top: 1.2rem;
        width: 2px;
        height: calc(100% - 0.5rem);
        background-color: #e2e8f0;
    }

    .ai-agent .timeline-item:last-child:after {
        display: none;
    }

    .ai-agent .highlight-text {
        color: var(--accent-color);
        font-weight: 600;
    }

    .ai-hero-card {
        background: white;
        padding: 3rem;
        margin-top: 2rem;
        margin-bottom: 3rem;
        border: 1px solid rgba(99, 102, 241, 0.1);
        position: relative;
        overflow: hidden;
        transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.1);
    }

    .ai-hero-card:before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 5px;
        background: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 50%, #8b5cf6 100%);
    }

    .ai-hero-card .ai-badge {
        position: absolute;
        top: 20px;
        right: 20px;
        background: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 50%, #8b5cf6 100%);
        color: white;
        padding: 0.5rem 1.5rem;
        border-radius: 50px;
        font-size: 0.9rem;
        font-weight: 700;
        z-index: 2;
        animation: pulse 2s infinite;
    }

    .ai-hero-card .feature-icon {
        width: 70px;
        height: 70px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.8rem;
        color: white;
        background: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 50%, #8b5cf6 100%);
        box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
        transition: all 0.3s ease;
    }

    .process-step {
        background-color: #f8fafc;
        padding: 1rem;
        height: 100%;
        text-align: center;
        border: 1px solid #e2e8f0;
        transition: all 0.3s ease;
    }

    .process-step:hover {
        background-color: white;
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    }

    .process-step .process-number {
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background-color: var(--primary);
        color: white;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 700;
        margin: 0 auto 1rem;
    }


    .section-padding {
        padding: 100px 0;
    }

    .container {
        max-width: 1300px;
    }

    /* 标题样式优化 */
    .section-title {
        margin-bottom: 70px;
        position: relative;
    }

    .section-title h2 {
        font-size: 2.8rem;
        margin-bottom: 20px;
        background: var(--gradient-primary);
        -webkit-background-clip: text;
        background-clip: text;
        color: transparent;
        position: relative;
        display: inline-block;
    }

    .section-title h2::after {
        content: '';
        position: absolute;
        bottom: -12px;
        left: 0;
        width: 70px;
        height: 4px;
        background: var(--gradient-primary);
        border-radius: 2px;
    }

    .section-title p {
        font-size: 1.1rem;
        color: var(--dark-gray);
        margin-top: 25px;
    }

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

    /* 导航栏优化 */
    .navbar {
        background-color: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        padding: 20px 0;
        transition: var(--transition);
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.02);
    }

    .navbar.scrolled {
        padding: 15px 0;
        box-shadow: 0 8px 25px rgba(0, 0, 0, 0.05);
    }

    .navbar-brand {
        font-weight: 800;
        font-size: 1.6rem;
        color: var(--dark) !important;
        display: flex;
        align-items: center;
        gap: 10px;
    }


    .nav-link {
        color: var(--dark) !important;
        font-weight: 600;
        margin: 0 8px;
        transition: var(--transition-fast);
        position: relative;
        padding: 8px 0 !important;
    }

    .nav-link::before {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 0;
        height: 3px;
        background: var(--gradient-primary);
        border-radius: 2px;
        transition: var(--transition);
    }

    .nav-link:hover,
    .nav-link.active {
        color: var(--primary) !important;
    }

    .nav-link:hover::before,
    .nav-link.active::before {
        width: 100%;
    }

    /* 按钮优化 */
    .btn-primary-custom {
        background: var(--gradient-primary);
        color: white;
        border: none;
        padding: 14px 32px;
        border-radius: 50px;
        font-weight: 600;
        transition: var(--transition);
        box-shadow: 0 10px 25px rgba(59, 130, 246, 0.3);
        position: relative;
        overflow: hidden;
        z-index: 1;
    }

    .btn-primary-custom::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
        transition: var(--transition);
        z-index: -1;
    }

    .btn-primary-custom:hover {
        transform: translateY(-3px);
        box-shadow: 0 15px 35px rgba(59, 130, 246, 0.4);
        color: white;
    }

    .btn-primary-custom:hover::before {
        left: 100%;
    }

    .btn-outline-custom {
        background: transparent;
        color: var(--primary);
        border: 2px solid var(--primary);
        padding: 12px 28px;
        border-radius: 50px;
        font-weight: 600;
        transition: var(--transition);
    }

    .btn-outline-custom:hover {
        background: var(--primary);
        color: white;
        transform: translateY(-3px);
        box-shadow: 0 10px 25px rgba(59, 130, 246, 0.2);
    }

    /* Hero 区域优化 */
    .hero-section {
        padding: 180px 0 120px;
        position: relative;
        overflow: hidden;
        background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
    }

    .hero-section::before {
        content: '';
        position: absolute;
        top: -300px;
        right: -200px;
        width: 800px;
        height: 800px;
        background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, rgba(59, 130, 246, 0) 70%);
        border-radius: 50%;
        z-index: 0;
    }

    .hero-section::after {
        content: '';
        position: absolute;
        bottom: -200px;
        left: -200px;
        width: 600px;
        height: 600px;
        background: radial-gradient(circle, rgba(139, 92, 246, 0.06) 0%, rgba(139, 92, 246, 0) 70%);
        border-radius: 50%;
        z-index: 0;
    }

    .hero-title {
        font-size: 3.5rem;
        font-weight: 800;
        margin-bottom: 25px;
        line-height: 1.1;
    }

    .hero-subtitle {
        font-size: 1.2rem;
        color: var(--dark-gray);
        margin-bottom: 40px;
        max-width: 650px;
    }

    .hero-stats {
        display: flex;
        gap: 30px;
        margin-top: 50px;
        flex-wrap: wrap;
    }

    .stat-item {
        text-align: center;
        padding: 20px;
        background: white;
        transition: var(--transition);
        min-width: 140px;
    }

    .stat-item:hover {
        transform: translateY(-8px);
        box-shadow: var(--shadow-hover);
    }

    .stat-number {
        font-size: 2.5rem;
        font-weight: 800;
        background: var(--gradient-primary);
        -webkit-background-clip: text;
        background-clip: text;
        color: transparent;
        line-height: 1;
    }

    .stat-label {
        font-size: 0.95rem;
        color: var(--dark-gray);
        margin-top: 8px;
        font-weight: 600;
    }

    /* 卡片样式优化 - 统一设计语言 */
    .card {
        border: none;
        border-radius: var(--border-radius);
        box-shadow: var(--shadow);
        transition: var(--transition);
        overflow: hidden;
    }

    .card:hover {
        transform: translateY(-10px);
        box-shadow: var(--shadow-hover);
    }

    .feature-card,
    .service-card,
    .case-card {
        background: white;
        border: none;
        transition: var(--transition);
        height: 100%;
        overflow: hidden;
    }

    .feature-card:hover,
    .service-card:hover,
    .case-card:hover {
        transform: translateY(-10px);
        box-shadow: var(--shadow-hover);
    }

    /* 图标样式优化 */
    .icon-wrapper {
        width: 70px;
        height: 70px;
        background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 25px;
        font-size: 32px;
        color: var(--primary);
        transition: var(--transition);
    }

    .feature-card:hover .icon-wrapper {
        transform: scale(1.05) rotate(5deg);
        background: 0 30px 60px rgba(0, 0, 0, 0.12);

    }

    /* 服务卡片优化 */
    .service-card {
        padding: 35px;
        position: relative;
    }

    .service-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 4px;
        background: var(--gradient-primary);
        opacity: 0;
        transition: var(--transition);
    }

    .service-card:hover::before {
        opacity: 1;
    }

    .service-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        margin-top: 15px;
    }

    .service-tag {
        background: rgba(59, 130, 246, 0.1);
        color: var(--primary);
        padding: 6px 14px;
        border-radius: 50px;
        font-size: 0.85rem;
        font-weight: 600;
        transition: var(--transition-fast);
    }

    .service-card:hover .service-tag {
        background: rgba(59, 130, 246, 0.15);
        transform: translateY(-2px);
    }

    /* 案例卡片优化 */
    .case-card {
        overflow: hidden;
    }

    .case-image {
        height: 200px;
        background: linear-gradient(135deg, var(--primary), var(--secondary));
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 64px;
        color: white;
        position: relative;
        overflow: hidden;
    }

    .case-image::after {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: linear-gradient(135deg, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0));
    }

    .case-content {
        padding: 30px;
    }

    .case-category {
        display: inline-block;
        background: rgba(6, 182, 212, 0.1);
        color: var(--accent);
        padding: 6px 16px;
        border-radius: 50px;
        font-size: 0.85rem;
        font-weight: 700;
        margin-bottom: 20px;
    }

    /* 时间线优化 */
    .timeline-container {
        position: relative;
        max-width: 1000px;
        margin: 0 auto;
    }

    #process .timeline-line {
        position: absolute;
        top: 0;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 3px;
        background: linear-gradient(to bottom, var(--primary), var(--accent));
        z-index: 0;
    }

    #process .timeline-item {
        display: flex;
        margin-bottom: 60px;
        position: relative;
        z-index: 1;
    }

    #process .timeline-item:nth-child(odd) {
        justify-content: flex-start;
        padding-right: 50%;
    }

    #process .timeline-item:nth-child(even) {
        justify-content: flex-end;
        padding-left: 50%;
    }

    .timeline-content {
        background: white;
        padding: 30px;
        width: 90%;
        border: none;
        transition: var(--transition);
    }

    .timeline-content:hover {
        transform: translateY(-5px);
        box-shadow: var(--shadow-hover);
    }

    .timeline-marker {
        position: absolute;
        top: 30px;
        left: 50%;
        transform: translateX(-50%);
        width: 20px;
        height: 20px;
        border-radius: 50%;
        background: white;
        border: 4px solid var(--primary);
        z-index: 2;
        box-shadow: 0 0 0 8px rgba(59, 130, 246, 0.2);
    }

    /* 合作伙伴区域优化 */
    .partner-logo {
        background: white;
        height: 120px;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: var(--transition);
        border: none;
    }

    .partner-logo:hover {
        transform: translateY(-8px);
        box-shadow: var(--shadow-hover);
    }

    /* 联系表单优化 */
    .contact-form {
        background: white;
        padding: 40px;
        border: none;
    }

    .form-control,
    .form-select {
        background: white;
        border: 1px solid var(--medium-gray);
        color: var(--dark);
        padding: 15px 20px;
        margin-bottom: 20px;
        transition: var(--transition-fast);
        font-size: 1rem;
    }

    .form-control:focus,
    .form-select:focus {
        background: white;
        border-color: var(--primary);
        color: var(--dark);
        box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
    }

    .form-control::placeholder {
        color: var(--dark-gray);
    }

    /* 页脚优化 */
    .footer {
        background: linear-gradient(135deg, #0f172a, #1e293b);
        color: white;
        padding: 80px 0 30px;
    }

    .footer-logo {
        font-weight: 800;
        font-size: 1.8rem;
        color: white;
        margin-bottom: 20px;
        display: inline-block;
    }

    .footer-logo span {
        background: var(--gradient-accent);
        -webkit-background-clip: text;
        background-clip: text;
        color: transparent;
    }

    .footer-links h5 {
        font-size: 1.3rem;
        margin-bottom: 25px;
        position: relative;
        padding-bottom: 12px;
    }

    .footer-links h5::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 40px;
        height: 3px;
        background: var(--gradient-accent);
        border-radius: 2px;
    }

    .footer-links ul {
        list-style: none;
        padding: 0;
    }

    .footer-links li {
        margin-bottom: 15px;
    }

    .footer-links a {
        color: #cbd5e1;
        text-decoration: none;
        transition: var(--transition-fast);
    }

    .footer-links a:hover {
        color: white;
        padding-left: 5px;
    }

    .social-links {
        display: flex;
        gap: 12px;
        margin-top: 20px;
    }

    .social-link {
        width: 42px;
        height: 42px;
        border-radius: 50%;
        background: rgba(255, 255, 255, 0.1);
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
        transition: var(--transition);
    }

    .social-link:hover {
        background: var(--primary);
        color: white;
        transform: translateY(-3px) rotate(5deg);
    }

    .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        padding-top: 30px;
        margin-top: 50px;
        text-align: center;
        color: #94a3b8;
        font-size: 0.9rem;
    }

    #cases .btn-group .active {
        background-color: var(--primary);
        border: 1px solid var(--primary);
    }

    /* 响应式设计优化 */
    @media (max-width: 1199px) {
        .hero-title {
            font-size: 3rem;
        }

        .section-title{
            margin-bottom: 0px !important;
        }
        .section-title h2 {
            font-size: 2.5rem;
        }

        #process .timeline-item:nth-child(even) {
            padding-left: unset;
        }

        #process .timeline-item:nth-child(odd) {
            padding-right: unset;
        }
    }

    @media (max-width: 991px) {
        .hero-title {
            font-size: 2.6rem;
        }

        .section-padding {
            padding: 80px 0;
        }

        #process .timeline-line {
            /* left: 30px; */
            display: none;
        }

        #process .timeline-item {
            flex-direction: row !important;
            justify-content: flex-start;
            padding-left: 0px;
            padding-right: 0;
        }

        .timeline-content {
            width: 100%;
        }

        .timeline-marker {
            /* left: 30px; */
            display: none;
        }

        .contact-form {
            padding: 40px;
        }
    }

    @media (max-width: 767px) {
        .hero-title {
            font-size: 2.3rem;
        }

        .hero-subtitle {
            font-size: 1.1rem;
        }

        .section-title h2 {
            font-size: 2rem;
        }

        .section-title p {
            font-size: 1rem;
        }

        .hero-stats {
            gap: 15px;
        }

        .stat-item {
            min-width: 120px;
            padding: 18px;
        }

        .stat-number {
            font-size: 2rem;
        }

        .service-card,
        .contact-form {
            padding: 25px;
        }
    }

    @media (max-width: 575px) {
        .hero-title {
            font-size: 2rem;
        }

        .section-title h2 {
            font-size: 1.8rem;
        }

        .section-padding {
            padding: 70px 0;
        }

        .contact-form {
            padding: 25px 20px;
        }

        .btn-primary-custom,
        .btn-outline-custom {
            padding: 12px 24px;
        }
    }