* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Helvetica Neue', Arial, sans-serif;
}

body {
    color: #333;
    line-height: 1.6;
    background-color: #f8f9fa;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, #1a2a6c, #2b5876);
    color: white;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
}

.logo span {
    color: #4ecdc4;
}

/* 电脑端导航菜单 */
nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 25px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: #4ecdc4;
}

/* 移动菜单按钮 - 默认隐藏 */
.mobile-menu-btn {
    display: none;
    font-size: 24px;
    background: none;
    border: none;
    color: white;
    cursor: pointer;
}

/* 页脚 */
footer {
    background: #2b5876;
    color: white;
    padding: 40px 0 20px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

.footer-section {
    flex: 1;
    min-width: 250px;
    margin-bottom: 30px;
}

.footer-section h3 {
    margin-bottom: 20px;
    font-size: 1.3rem;
    color: white;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

/* 修改底部链接样式 - 去掉下划线，文字白色 */
.footer-section ul li a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section ul li a:hover {
    color: #4ecdc4;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
}

/* 移动导航菜单 - 默认隐藏 */
.mobile-nav {
    display: none;
    background: #1a2a6c;
    padding: 15px;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    z-index: 999;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
}

.mobile-nav.active {
    display: block;
}

.mobile-nav ul {
    list-style: none;
}

.mobile-nav ul li {
            margin: 15px 0;
            text-align: center;
        }
        
        .mobile-nav ul li a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            display: block;
            padding: 10px;
            font-size: 1.1rem;
            transition: background 0.3s;
        }
        
        .mobile-nav ul li a:hover {
            background: rgba(255, 255, 255, 0.1);
            border-radius: 5px;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            /* 隐藏电脑端导航菜单 */
            nav ul {
                display: none;
            }
            
            /* 显示移动菜单按钮 */
            .mobile-menu-btn {
                display: block;
            }
            
            .header-content {
                flex-direction: row;
                text-align: left;
            }
            
            .hero h1 {
                font-size: 2rem;
            }
            
            .hero p {
                font-size: 1rem;
            }
            
            .about-text, .about-image {
                flex: 100%;
                padding-right: 0;
            }
            
            .about-text {
                margin-bottom: 30px;
            }
            
            .process-steps {
                flex-direction: column;
            }
            
            .step {
                margin-bottom: 40px;
            }
            
            .step:not(:last-child)::after {
                display: none;
            }
            
            .footer-content {
                flex-direction: column;
            }
            
            .footer-section {
                margin-bottom: 30px;
            }
            
            /* 优化移动端表单元素 */
            .contact-form input,
            .contact-form textarea {
                font-size: 16px; /* 防止iOS缩放 */
            }
            
            /* 增加移动端按钮大小 */
            .btn {
                padding: 15px 30px;
            }
        }
        
        /* 大屏设备优化 */
        @media (min-width: 769px) {
            /* 确保在大屏设备上隐藏移动导航 */
            .mobile-nav {
                display: none !important;
            }
        }