/* CSS变量定义 */
:root {
    --primary-color: #2a5298;
    --secondary-color: #667eea;
    --accent-color: #764ba2;
    --text-color: #333;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --white: #ffffff;
    --shadow: 0 10px 30px rgba(0,0,0,0.1);
    --shadow-hover: 0 20px 40px rgba(0,0,0,0.15);
    --border-radius: 15px;
    --transition: all 0.3s ease;
}

/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 屏幕阅读器友好样式 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
    overflow-x: hidden; /* 防止水平滚动 */
    word-wrap: break-word; /* 长单词自动换行 */
}

/* 确保所有图片都是响应式的 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
.navbar {
    background: linear-gradient(135deg, #1e3c72 0%, var(--primary-color) 100%);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    gap: 20px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
    min-width: 0;
}

.nav-logo .logo {
    height: 45px;
    width: auto;
    max-width: 100%;
    background: white;
    padding: 6px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    flex-shrink: 0;
    object-fit: contain; /* 确保图片比例正确 */
}

.company-name {
    color: white;
    font-size: 16px;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px; /* 限制最大宽度，防止溢出 */
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 20px;
    align-items: center;
    flex-wrap: nowrap;
    flex: 1;
    justify-content: flex-end;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
    display: flex;
    align-items: center;
    height: 100%;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 10px 12px;
    border-radius: 5px;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    white-space: nowrap;
    line-height: 1.5;
    height: auto;
    vertical-align: middle;
}

.nav-link:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

.nav-link i {
    font-size: 0.75rem;
    opacity: 0.8;
    transition: transform 0.3s ease;
    display: inline-flex;
    align-items: center;
    vertical-align: middle;
}

.dropdown:hover .nav-link i {
    transform: rotate(180deg);
}

/* 下拉菜单样式 */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    min-width: 200px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    border-radius: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    list-style: none;
    padding: 10px 0;
    z-index: 1001;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: 12px 20px;
    color: #333;
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.dropdown-menu a:hover {
    background: #f8f9fa;
    color: #2a5298;
    border-left-color: #2a5298;
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: white;
    margin: 3px 0;
    transition: 0.3s;
}

/* 首页横幅 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 120px 0 80px;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    min-height: calc(100vh - 200px);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    flex: 1.2;
    max-width: 700px;
    z-index: 2;
    position: relative;
    padding-right: 40px;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    color: white;
    margin-bottom: 25px;
    line-height: 1.2;
    max-width: 90%;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.9);
    margin-bottom: 35px;
    line-height: 1.7;
    max-width: 85%;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    text-align: center;
    border: 2px solid transparent;
}

.btn-primary {
    background: white;
    color: #667eea;
    border-color: white;
    border-width: 2px;
    border-style: solid;
}

.btn-primary:hover {
    background: transparent;
    color: white;
    border-color: white;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
    border-width: 2px;
    border-style: solid;
}

.btn-secondary:hover {
    background: white;
    color: #667eea;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.hero-image {
    flex: 0.8;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2;
    position: relative;
    padding-left: 40px;
}

.security-icon {
    font-size: 6rem;
    color: rgba(255,255,255,0.4);
    animation: float 3s ease-in-out infinite;
    position: relative;
}

.security-icon::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    border: 2px solid rgba(255,255,255,0.2);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { 
        transform: scale(1);
        opacity: 0.5;
    }
    50% { 
        transform: scale(1.1);
        opacity: 0.8;
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* 通用区块样式 */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
    color: #2a5298;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 60px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* 服务项目样式 */
.services {
    padding: 100px 0;
    background: #f8f9fa;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.service-card {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: 1px solid #e9ecef;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    color: white;
    font-size: 2rem;
}

.service-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #2a5298;
}

.service-card p {
    color: #666;
    line-height: 1.6;
}

/* 解决方案样式 */
.solutions {
    padding: 100px 0;
    background: white;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.solution-card {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: 1px solid #dee2e6;
}

.solution-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px rgba(0,0,0,0.15);
}

.solution-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.solution-header h3 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #2a5298;
}

.solution-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.solution-content p {
    color: #666;
    margin-bottom: 20px;
    line-height: 1.6;
}

.solution-features {
    list-style: none;
}

.solution-features li {
    padding: 8px 0;
    color: #555;
    position: relative;
    padding-left: 25px;
}

.solution-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #28a745;
    font-weight: bold;
}

/* 认证服务样式 */
.certification {
    padding: 100px 0;
    background: #f8f9fa;
}

.certification-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.cert-card {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: 1px solid #e9ecef;
}

.cert-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.cert-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #28a745, #20c997);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    color: white;
    font-size: 2rem;
}

.cert-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #2a5298;
}

.cert-card p {
    color: #666;
    margin-bottom: 20px;
    line-height: 1.6;
}

.cert-card ul {
    list-style: none;
    text-align: left;
}

.cert-card ul li {
    padding: 5px 0;
    color: #555;
    position: relative;
    padding-left: 20px;
}

.cert-card ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #28a745;
    font-weight: bold;
}

/* 关于我们样式 */
.about {
    padding: 100px 0;
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2a5298;
    margin-bottom: 30px;
}

.about-text p {
    color: #666;
    margin-bottom: 25px;
    line-height: 1.8;
    font-size: 1.1rem;
}

.about-stats {
    display: flex;
    gap: 40px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
}

.stat-item h3 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 10px;
}

.stat-item p {
    color: #666;
    font-weight: 500;
}

.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-icon {
    font-size: 8rem;
    color: #e9ecef;
}

/* 联系我们样式 */
.contact {
    padding: 100px 0;
    background: #f8f9fa;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-top: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
    background: white;
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-details h4 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #2a5298;
    margin-bottom: 5px;
}

.contact-details p {
    color: #666;
    margin: 0;
}

.contact-details a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-details a:hover {
    color: #2a5298;
}

.contact-form {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
}

.contact-form h3 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #2a5298;
    margin-bottom: 30px;
    text-align: center;
}

.form-group {
    margin-bottom: 25px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* 页脚样式 */
.footer {
    background: #2a5298;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: white;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.footer-logo .logo {
    height: 40px;
    width: auto;
    background: white;
    padding: 6px;
    border-radius: 6px;
}

.footer-section p {
    color: rgba(255,255,255,0.8);
    line-height: 1.6;
    margin-bottom: 15px;
}

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

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

.footer-section ul li a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.2);
    padding-top: 20px;
    text-align: center;
    color: rgba(255,255,255,0.8);
}

.footer-bottom p {
    margin-bottom: 10px;
}

.footer-bottom a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-bottom a:hover {
    color: white;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .nav-container {
        max-width: 100%;
        padding: 0 15px;
    }
    
    .nav-menu {
        gap: 15px;
    }
    
    .nav-link {
        padding: 10px 10px;
        font-size: 0.95rem;
    }
    
    .company-name {
        font-size: 14px;
        max-width: 150px; /* 在中等屏幕上缩小 */
    }
    
    .hero-content {
        flex: 1.1;
        max-width: 650px;
        padding-right: 30px;
    }
    
    .hero-image {
        flex: 0.9;
        padding-left: 30px;
    }
    
    .hero-title {
        font-size: 2.8rem;
    }
    
    /* 确保网格在中等屏幕不会溢出 */
    .solutions-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    /* 隐藏导航菜单 */
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: #2a5298;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0,0,0,0.05);
        padding: 20px 0;
        max-height: calc(100vh - 70px);
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-item {
        margin: 15px 0;
        width: 100%;
    }
    
    .nav-link {
        width: 100%;
        display: block;
        padding: 15px 20px;
    }
    
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: rgba(255,255,255,0.1);
        margin-top: 10px;
        border-radius: 10px;
        width: 100%;
    }
    
    .dropdown-menu li {
        width: 100%;
    }
    
    .dropdown-menu a {
        width: 100%;
        padding: 12px 20px;
    }
    
    /* 移动端隐藏公司名称，只显示Logo */
    .company-name {
        display: none;
    }
    
    .nav-logo {
        gap: 8px;
        flex: 1;
        min-width: 0;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero .container {
        flex-direction: column;
        text-align: center;
        min-height: auto;
    }
    
    .hero-content {
        flex: none;
        max-width: 100%;
        padding-right: 0;
        margin-bottom: 40px;
    }
    
    .hero-image {
        flex: none;
        padding-left: 0;
    }
    
    .hero-title {
        font-size: 2.5rem;
        max-width: 100%;
    }
    
    .hero-subtitle {
        max-width: 100%;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .security-icon {
        font-size: 5rem;
        margin-top: 20px;
    }
    
    /* 修复所有网格布局，确保在移动端都是1列 */
    .services-grid,
    .certification-grid,
    .solutions-grid,
    .contact-grid,
    .cases-grid,
    .overview-grid,
    .content-grid,
    .advantages-grid,
    .standards-grid,
    .platform-features-grid {
        grid-template-columns: 1fr !important;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .about-stats {
        justify-content: center;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    /* 修复子页面网格布局 */
    .process-steps,
    .content-grid,
    .standards-list {
        grid-template-columns: 1fr !important;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    /* 确保导航栏在小屏幕上不溢出 */
    .nav-container {
        padding: 0 10px;
        gap: 10px;
    }
    
    .nav-logo .logo {
        height: 35px;
        padding: 4px;
    }
    
    .hero-title {
        font-size: 2rem;
        line-height: 1.3;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        line-height: 1.6;
    }
    
    .btn {
        padding: 12px 25px;
        font-size: 0.9rem;
        width: 100%;
        max-width: 280px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    .service-card,
    .cert-card,
    .solution-card,
    .contact-card,
    .case-item {
        padding: 30px 20px;
    }
    
    .contact-form {
        padding: 30px 20px;
    }
    
    .about-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    /* 确保所有网格在小屏幕都是1列且无溢出 */
    .services-grid,
    .certification-grid,
    .solutions-grid,
    .contact-grid,
    .cases-grid,
    .overview-grid,
    .content-grid,
    .advantages-grid,
    .standards-grid,
    .platform-features-grid,
    .process-steps,
    .standards-list {
        grid-template-columns: 1fr !important;
        gap: 20px;
    }
    
    /* 修复解决方案卡片在小屏幕的padding */
    .solution-card {
        padding: 25px 20px;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    /* 确保所有文本和链接在小屏幕不会溢出 */
    p, a, h1, h2, h3, h4, h5, h6 {
        word-wrap: break-word;
        overflow-wrap: break-word;
    }
    
    /* 修复地址等长文本 */
    .contact-card p {
        word-break: break-all;
    }
    
    /* 确保按钮文本不会溢出 */
    .btn {
        white-space: normal;
        word-wrap: break-word;
    }
    
    /* 修复联系卡片在极小屏幕的布局 */
    .contact-cta {
        padding: 30px 15px;
    }
    
    .contact-cta h3 {
        font-size: 1.5rem;
    }
    
    .contact-cta p {
        font-size: 1rem;
    }
    
    /* 修复页脚在小屏幕的布局 */
    .footer {
        padding: 40px 0 20px;
    }
    
    .footer-content {
        gap: 30px;
    }
    
    .footer-logo {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .footer-logo .company-name {
        display: block;
        margin-top: 10px;
        color: white;
    }
    
    /* 确保表格和列表在小屏幕正常显示 */
    table {
        width: 100%;
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    /* 修复长URL和邮箱地址 */
    a[href^="mailto:"],
    a[href^="tel:"] {
        word-break: break-all;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 加载动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.service-card,
.solution-card,
.cert-card {
    animation: fadeInUp 0.6s ease-out;
}

/* 焦点样式 - 可访问性 */
*:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
}

.btn:focus,
.nav-link:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
}

/* 子页面样式 */
.page-header {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    padding: 120px 0 80px;
    color: white;
    text-align: center;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    max-width: 800px;
    margin: 0 auto;
}

.header-icon {
    font-size: 4rem;
    opacity: 0.8;
}

.header-text h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    font-weight: 700;
}

.header-text p {
    font-size: 1.2rem;
    opacity: 0.9;
    line-height: 1.6;
}

.service-overview {
    padding: 80px 0;
    background: white;
}

.overview-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    align-items: center;
}

.overview-text h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 25px;
}

.overview-text p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.overview-text ul {
    list-style: none;
    padding: 0;
}

.overview-text ul li {
    padding: 8px 0;
    color: var(--text-light);
    position: relative;
    padding-left: 25px;
}

.overview-text ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.service-visual {
    font-size: 6rem;
    color: var(--secondary-color);
    text-align: center;
    opacity: 0.7;
}

.service-process {
    padding: 80px 0;
    background: var(--bg-light);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.step {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    position: relative;
    transition: var(--transition);
}

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

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto 20px;
}

.step-content h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.step-content p {
    color: var(--text-light);
    line-height: 1.6;
}

.service-content {
    padding: 80px 0;
    background: white;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.content-card {
    background: var(--bg-light);
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
    border: 1px solid #e9ecef;
}

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

.card-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 2rem;
}

.content-card h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.content-card ul {
    list-style: none;
    text-align: left;
    padding: 0;
}

.content-card ul li {
    padding: 8px 0;
    color: var(--text-light);
    position: relative;
    padding-left: 20px;
}

.content-card ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.service-advantages {
    padding: 80px 0;
    background: var(--bg-light);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.advantage-item {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.advantage-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #28a745, #20c997);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 1.8rem;
}

.advantage-item h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.advantage-item p {
    color: var(--text-light);
    line-height: 1.6;
}

.testing-standards {
    padding: 80px 0;
    background: white;
}

.standards-content {
    margin-top: 60px;
}

.standards-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.standard-item {
    background: var(--bg-light);
    padding: 30px;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--secondary-color);
    transition: var(--transition);
}

.standard-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow);
}

.standard-item h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.standard-item p {
    color: var(--text-light);
    line-height: 1.6;
}

.contact-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    text-align: center;
}

.contact-content h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.contact-content p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.contact-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
}

.contact-buttons .btn {
    min-width: 160px;
    padding: 15px 25px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    border: 2px solid;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* 客户案例样式 */
.cases {
    padding: 80px 0;
    background: white;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.case-item {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.case-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.case-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 2rem;
}

.case-item h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-color);
}

.case-item p {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 20px;
}

.case-result {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.result-item {
    background: #e8f5e8;
    color: #2d5a2d;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* 联系高亮样式 */
.contact-highlight {
    margin-top: 20px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    text-align: center;
}

.contact-highlight p {
    margin: 5px 0;
    font-weight: 500;
}

.contact-highlight i {
    margin-right: 10px;
    color: var(--accent-color);
}

/* 联系我们新样式 */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.contact-card {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 2px solid transparent;
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    border-color: var(--primary-color);
}

.contact-card .contact-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 2rem;
}

.contact-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-color);
    font-weight: 600;
}

.contact-card p {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 10px;
}

.contact-card p:first-of-type {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-color);
}

.contact-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.contact-card a:hover {
    color: var(--secondary-color);
}

.contact-note {
    font-size: 0.9rem;
    color: var(--text-light);
    font-style: italic;
    margin-top: 10px;
}

.contact-cta {
    text-align: center;
    margin-top: 60px;
    padding: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 15px;
    color: white;
}

.contact-cta h3 {
    font-size: 2rem;
    margin-bottom: 15px;
    font-weight: 700;
}

.contact-cta p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.contact-cta .contact-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
}

.contact-buttons .btn {
    min-width: 160px;
    padding: 15px 25px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    border: 2px solid;
}

.contact-cta .btn {
    padding: 15px 30px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.contact-cta .btn-primary {
    background: white;
    color: var(--primary-color);
    border: 2px solid white;
}

.contact-cta .btn-primary:hover {
    background: transparent;
    color: white;
    border-color: white;
}

.contact-cta .btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.contact-cta .btn-secondary:hover {
    background: white;
    color: var(--primary-color);
}

/* 联系我们响应式设计 */
@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 40px;
    }
    
    .contact-card {
        padding: 30px 20px;
    }
    
    .contact-card .contact-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .contact-cta {
        margin-top: 40px;
        padding: 30px 20px;
    }
    
    .contact-cta h3 {
        font-size: 1.5rem;
    }
    
    .contact-cta .contact-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-cta .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
}

/* 车联网安全解决方案样式 */
#automotive-solution {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

#automotive-solution .solution-header h3 {
    color: white;
}

#automotive-solution .solution-content p {
    color: rgba(255, 255, 255, 0.9);
}

#automotive-solution .solution-features li {
    color: rgba(255, 255, 255, 0.8);
}

#automotive-solution .solution-features li::before {
    color: #4ade80;
}

/* ISO 21434认证卡片样式 */
#iso21434 {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

#iso21434 .cert-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

#iso21434 h3 {
    color: white;
}

#iso21434 p {
    color: rgba(255, 255, 255, 0.9);
}

#iso21434 ul li {
    color: rgba(255, 255, 255, 0.8);
}

#iso21434 ul li::before {
    color: #4ade80;
}

/* 车联网页面特殊样式 */
.automotive-security .page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 0 80px;
}

.automotive-security .page-header h1 {
    color: white;
    font-size: 3rem;
    margin-bottom: 20px;
}

.automotive-security .page-header p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.2rem;
}


/* 车联网服务概览网格 */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.overview-item {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.overview-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.overview-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 2rem;
}

.overview-item h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-color);
    font-weight: 600;
}

.overview-item p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 车联网内容网格 */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.content-item {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.content-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: white;
    font-size: 1.5rem;
}

.content-item h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-color);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.content-item p {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 20px;
}

.content-item ul {
    list-style: none;
    padding: 0;
}

.content-item ul li {
    padding: 8px 0;
    color: var(--text-light);
    position: relative;
    padding-left: 20px;
}

.content-item ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* 车联网优势网格 */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.advantage-item {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.advantage-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.advantage-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 2rem;
}

.advantage-item h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-color);
    font-weight: 600;
}

.advantage-item p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 车联网测试标准网格 */
.standards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.standard-item {
    background: white;
    padding: 30px 20px;
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s ease;
}

.standard-item:hover {
    transform: translateY(-3px);
}

.standard-item h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--primary-color);
    font-weight: 600;
}

.standard-item p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* 车联网响应式设计 */
@media (max-width: 768px) {
    .automotive-security .page-header h1 {
        font-size: 2rem;
    }
    
    .overview-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 40px;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 40px;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 40px;
    }
    
    .standards-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 15px;
    }
    
    .overview-item,
    .content-item,
    .advantage-item {
        padding: 30px 20px;
    }
}