:root {
            /* 主色调 */
            --primary: #0F52BA;
            --primary-light: #1A68D1;
            --primary-dark: #0A408E;
            /* 刚挠PCB专属色 */
            --rigid-flex: #7952b3;
            --rigid-flex-light: #8a66c0;
            --rigid-flex-dark: #614294;
            /* 辅助色 */
            --secondary: #28a745;
            --secondary-light: #34d058;
            --secondary-dark: #1e7e34;
            /* 中性色 */
            --dark: #212529;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --light: #f8f9fa;
            --white: #ffffff;
            /* 边框和阴影 */
            --border: #dee2e6;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.12);
            /* 过渡效果 */
            --transition: all 0.3s ease-in-out;
        }

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

        body {
            font-family: 'Inter', sans-serif;
            color: var(--dark);
            line-height: 1.8;
            background-color: var(--light);
        }

        /* 通用容器 */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }

        /* 通用间距 */
        .py-section {
            padding: 80px 0;
        }
        
        .py-sm {
            padding: 40px 0;
        }

        /* 标题样式 */
        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary);
            text-align: center;
            margin-bottom: 60px;
            position: relative;
            line-height: 1.3;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -20px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--primary);
            border-radius: 2px;
        }

        .section-title.rigid-flex {
            color: var(--rigid-flex);
        }

        .section-title.rigid-flex::after {
            background-color: var(--rigid-flex);
        }

        .section-subtitle {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 25px;
            display: flex;
            align-items: center;
        }

        .section-subtitle.rigid-flex {
            color: var(--rigid-flex);
        }

        .section-subtitle i {
            margin-right: 12px;
            font-size: 1.2em;
            color: inherit;
        }

        /* 按钮样式 */
        .btn {
            display: inline-block;
            padding: 12px 30px;
            background-color: var(--primary);
            color: var(--white);
            text-decoration: none;
            border-radius: 6px;
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            text-align: center;
        }

        .btn:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }

        .btn.rigid-flex {
            background-color: var(--rigid-flex);
        }

        .btn.rigid-flex:hover {
            background-color: var(--rigid-flex-dark);
        }

        .btn.secondary {
            background-color: var(--secondary);
        }

        .btn.secondary:hover {
            background-color: var(--secondary-dark);
        }

        .btn-group {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
            justify-content: center;
            margin: 20px 0;
        }

        /* 卡片样式 */
        .card {
            background-color: var(--white);
            border-radius: 10px;
            box-shadow: var(--shadow);
            padding: 30px;
            transition: var(--transition);
            height: 100%;
        }

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

        .card.rigid-flex {
            border-top: 4px solid var(--rigid-flex);
        }

        .card-title {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 15px;
        }

        .card-title.rigid-flex {
            color: var(--rigid-flex);
        }

        /* 网格布局 */
        .grid {
            display: grid;
            grid-template-columns: repeat(12, 1fr);
            gap: 30px;
        }

        .col-12 {
            grid-column: span 12;
        }

        .col-6 {
            grid-column: span 6;
        }

        .col-4 {
            grid-column: span 4;
        }

        .col-8 {
            grid-column: span 8;
        }

        /* 列表样式 */
        .custom-list {
            list-style: none;
            padding-left: 0;
            margin: 20px 0;
        }

        .custom-list li {
            padding-left: 30px;
            position: relative;
            margin-bottom: 10px;
        }

        .custom-list li::before {
            content: '\f00c';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            left: 0;
            color: var(--secondary);
            font-size: 1.1em;
        }

        .custom-list.rigid-flex li::before {
            color: var(--rigid-flex);
        }

        /* 表格样式 */
        .table {
            width: 100%;
            border-collapse: collapse;
            margin: 30px 0;
            background-color: var(--white);
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }

        .table th, .table td {
            padding: 15px 20px;
            text-align: left;
            border-bottom: 1px solid var(--border);
        }

        .table th {
            background-color: var(--primary-light);
            color: var(--white);
            font-weight: 600;
        }

        .table.rigid-flex th {
            background-color: var(--rigid-flex-light);
        }

        .table tr:last-child td {
            border-bottom: none;
        }

        .table tr:hover td {
            background-color: var(--light-gray);
        }

        /* 图标盒子 */
        .icon-box {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background-color: rgba(15, 82, 186, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 25px;
        }

        .icon-box.rigid-flex {
            background-color: rgba(121, 82, 179, 0.1);
        }

        .icon-box i {
            font-size: 2rem;
            color: var(--primary);
        }

        .icon-box.rigid-flex i {
            color: var(--rigid-flex);
        }

        /* 标签样式 */
        .badge {
            display: inline-block;
            padding: 5px 15px;
            background-color: rgba(15, 82, 186, 0.1);
            color: var(--primary);
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 500;
            margin: 0 8px 10px 0;
        }

        .badge.rigid-flex {
            background-color: rgba(121, 82, 179, 0.1);
            color: var(--rigid-flex);
        }

        /* 提示框 */
        .alert {
            padding: 20px;
            border-radius: 8px;
            margin: 20px 0;
            border-left: 4px solid var(--primary);
            background-color: rgba(15, 82, 186, 0.05);
        }

        .alert.rigid-flex {
            border-left-color: var(--rigid-flex);
            background-color: rgba(121, 82, 179, 0.05);
        }

        .alert i {
            margin-right: 10px;
            color: var(--primary);
        }

        .alert.rigid-flex i {
            color: var(--rigid-flex);
        }

        /* FAQ样式 */
        .faq-item {
            background-color: var(--white);
            border-radius: 8px;
            margin-bottom: 15px;
            box-shadow: var(--shadow);
            overflow: hidden;
        }

        .faq-question {
            padding: 20px 30px;
            font-weight: 600;
            color: var(--primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition);
        }

        .faq-question.rigid-flex {
            color: var(--rigid-flex);
        }

        .faq-question:hover {
            background-color: var(--light-gray);
        }

        .faq-question i {
            transition: transform 0.3s ease;
        }

        .faq-answer {
            padding: 0 30px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.5s ease, padding 0.5s ease;
            border-top: 1px solid transparent;
        }

        .faq-answer.show {
            padding: 0 30px 30px;
            max-height: 1000px;
            border-top: 1px solid var(--border);
        }

        .faq-question.active i {
            transform: rotate(180deg);
        }

        /* 回到顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary);
            color: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: var(--shadow);
            transition: var(--transition);
            opacity: 0;
            visibility: hidden;
            z-index: 999;
        }

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

        .back-to-top:hover {
            background-color: var(--primary-dark);
            transform: translateY(-5px);
        }

        /* 头部样式 - 修改：移除导航栏后简化头部样式 */
        header {
            background-color: var(--white);
            box-shadow: var(--shadow);
            padding: 20px 0;
            position: sticky;
            top: 0;
            z-index: 999;
            text-align: center; /* 居中显示logo */
        }

        .header-content {
            display: flex;
            justify-content: center; /* 居中对齐，不再是space-between */
            align-items: center;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            text-decoration: none;
        }

        .logo span {
            color: var(--rigid-flex);
        }

        /* 英雄区域 */
        .hero {
            background: linear-gradient(135deg, var(--primary) 0%, var(--rigid-flex) 100%);
            color: var(--white);
            padding: 100px 0;
            text-align: center;
        }

        .hero h1 {
            font-size: 3rem;
            margin-bottom: 20px;
            line-height: 1.2;
        }

        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 40px;
            opacity: 0.9;
        }

        /* 联系信息样式 */
        .contact-info {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 15px;
        }

        .contact-info i {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background-color: rgba(121, 82, 179, 0.1);
            color: var(--rigid-flex);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* 响应式调整 */
        @media (max-width: 992px) {
            .col-6 {
                grid-column: span 12;
            }
            
            .col-4 {
                grid-column: span 6;
            }
            
            .col-8 {
                grid-column: span 12;
            }
            
            .section-title {
                font-size: 2rem;
            }
            
            .hero h1 {
                font-size: 2.5rem;
            }
        }

        @media (max-width: 768px) {
            .col-4 {
                grid-column: span 12;
            }
            
            .py-section {
                padding: 50px 0;
            }
            
            .section-title {
                font-size: 1.8rem;
                margin-bottom: 40px;
            }
            
            .hero h1 {
                font-size: 2rem;
            }
            
            .btn-group {
                flex-direction: column;
            }
            
            .table {
                font-size: 0.9rem;
            }
            
            .table th, .table td {
                padding: 10px 15px;
            }
        }

        @media (max-width: 480px) {
            .hero h1 {
                font-size: 1.8rem;
            }
            
            .card {
                padding: 20px;
            }
            
            .faq-question {
                padding: 15px 20px;
            }
            
            .faq-answer.show {
                padding: 0 20px 20px;
            }
        }