/* style.css - 公共样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

:root {
    --primary: #0056a6;
    --secondary: #e63946;
    --light: #f8f9fa;
    --dark: #343a40;
    --gray: #6c757d;
    --light-blue: #e3f2fd;
    --transition: all 0.3s ease;
}

body {
    color: #333;
    line-height: 1.6;
    background-color: #f9f9f9;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, var(--primary) 0%, #4a88c7 100%);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-icon {
    font-size: 2.5rem;
    color: #4dabf7;
}

.logo-text h1 {
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 1.2;
}

.logo-text p {
    font-size: 0.9rem;
    opacity: 0.9;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    padding: 5px 0;
    position: relative;
    transition: var(--transition);
}

nav a:hover {
    color: #4dabf7;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #4dabf7;
    transition: width 0.3s ease;
}

nav a:hover::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('../images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    text-align: center;
    padding: 5rem 1rem;
}

.hero h2 {
    font-size: 2.8rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 2rem;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    background-color: var(--secondary);
    color: white;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    border: 2px solid var(--secondary);
}

.cta-button:hover {
    background-color: transparent;
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* 通用部分标题样式 */
.section-title {
    text-align: center;
    margin: 4rem 0 2rem;
    position: relative;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 10px;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    width: 80px;
    height: 4px;
    background-color: var(--secondary);
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
}

.section-title p {
    color: var(--gray);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 20px auto 0;
}

/* 产品卡片样式 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 4rem;
}

.product-card {
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.product-header {
    background-color: var(--light-blue);
    padding: 20px;
    border-bottom: 1px solid #e0e0e0;
}

.product-header h3 {
    color: var(--primary);
    font-size: 1.4rem;
    margin-bottom: 5px;
}

.product-model {
    color: var(--secondary);
    font-weight: 600;
    font-size: 0.95rem;
}

.product-body {
    padding: 25px;
}

.product-summary {
    color: var(--dark);
    margin-bottom: 20px;
    line-height: 1.7;
}

.product-features {
    list-style-type: none;
    margin-bottom: 20px;
}

.product-features li {
    margin-bottom: 8px;
    padding-left: 25px;
    position: relative;
}

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

.product-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 25px;
    background-color: #f8f9fa;
    border-top: 1px solid #e0e0e0;
}

.detail-btn {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 8px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}

.detail-btn:hover {
    background-color: #004085;
}

.product-icon {
    font-size: 1.5rem;
    color: var(--primary);
}

/* 产品图片样式 */
.product-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background-color: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid #e0e0e0;
    position: relative;
}

.product-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}
/* 核心产品部分 - 新布局 */
.core-product .product-card {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 3rem;
    background: linear-gradient(135deg, #f8fafc 0%, #edf2f7 100%);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.core-product .product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.12);
}

.core-product .product-content {
    flex: 1;
}

.core-product .product-image {
    flex: 0 0 45%;
    text-align: center;
    height: auto;
    border-bottom: none;
    background-color: transparent;
    position: static;
}

.core-product .product-image img {
    max-width: 80%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    object-fit: contain;
}

.core-product .product-card:hover .product-image img {
    transform: scale(1.02);
}

.core-product .product-title {
    font-size: 1.8rem;
    color: #2d3748;
    margin-bottom: 1.2rem;
    border-left: 4px solid #3498db;
    padding-left: 1rem;
}

.core-product .product-features {
    margin: 1.5rem 0;
    padding-left: 1.2rem;
}

.core-product .product-features li {
    margin-bottom: 0.8rem;
    line-height: 1.6;
    color: #4a5568;
}

.core-product .product-features strong {
    color: #2d3748;
}

/* 响应式调整 */
@media (max-width: 992px) {
    .core-product .product-card {
        flex-direction: column;
        gap: 2rem;
    }
    
    .core-product .product-image {
        flex: 0 0 auto;
        width: 100%;
        height: 250px;
        background-color: #f5f5f5;
        border-bottom: 1px solid #e0e0e0;
    }
}

@media (max-width: 768px) {
    .core-product .product-card {
        padding: 1.5rem;
    }
    
    .core-product .product-title {
        font-size: 1.5rem;
    }
    
    .core-product .product-image {
        height: 200px;
    }
}
/* 关于我们部分 */
.about-section {
    background-color: white;
    border-radius: 10px;
    padding: 40px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    margin-bottom: 4rem;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.about-text h3 {
    color: var(--primary);
    font-size: 1.8rem;
    margin-bottom: 20px;
}

.about-text p {
    margin-bottom: 15px;
    line-height: 1.8;
}

.about-features {
    list-style-type: none;
    margin-top: 25px;
}

.about-features li {
    margin-bottom: 12px;
    padding-left: 30px;
    position: relative;
}

.about-features li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-size: 1.5rem;
    line-height: 1;
}

.about-image {
    text-align: center;
}

.about-image img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 8px;
}

/* 最新资讯样式 */
.news-section {
    background-color: white;
    border-radius: 10px;
    padding: 40px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    margin-bottom: 4rem;
}

.news-filter {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    background-color: #f8f9fa;
    color: var(--dark);
    border: 1px solid #ddd;
    padding: 10px 25px;
    border-radius: 30px;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

.filter-btn:hover {
    background-color: var(--light-blue);
    color: var(--primary);
}

.filter-btn.active {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
}

.news-card {
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    border: 1px solid #f0f0f0;
}

.news-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.news-image {
    height: 200px;
    overflow: hidden;
    background-color: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid #e0e0e0;
}

.news-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.news-body {
    padding: 25px;
}

.news-category {
    display: inline-block;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.news-category.patent {
    background-color: #e3f2fd;
    color: var(--primary);
}

.news-category.exhibition {
    background-color: #fff3cd;
    color: #856404;
}

.news-card h3 {
    color: var(--dark);
    font-size: 1.2rem;
    margin-bottom: 10px;
    line-height: 1.4;
}

.news-date {
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.news-summary {
    color: var(--gray);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 20px;
}

.news-detail-btn {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 8px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
    width: 100%;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.news-detail-btn:hover {
    background-color: #004085;
}

/* 联系我们样式 */
.contact-section {
    background-color: white;
    border-radius: 10px;
    padding: 40px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    margin-bottom: 4rem;
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info-container {
    padding-right: 20px;
}

.contact-form-container {
    padding-left: 20px;
    border-left: 1px solid #e0e0e0;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(0, 86, 166, 0.1);
}

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

.submit-btn {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 5px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 10px;
}

.submit-btn:hover {
    background-color: #004085;
    transform: translateY(-2px);
}

.required {
    color: var(--secondary);
}

.form-success {
    background-color: #d4edda;
    color: #155724;
    padding: 15px;
    border-radius: 5px;
    margin-top: 20px;
    display: none;
}
/* 关于我们页面的特定样式 - 新增 */

/* 我们的优势网格样式 */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr); /* 改为4列 */
    gap: 30px;
    margin-top: 30px;
}

.advantage-item {
    text-align: center;
    padding: 30px;
    background-color: #f8f9fa;
    border-radius: 8px;
    transition: transform 0.3s ease;
}

.advantage-item:hover {
    transform: translateY(-5px);
}
/* ... 之前的代码 ... */

.form-success {
    background-color: #d4edda;
    color: #155724;
    padding: 15px;
    border-radius: 5px;
    margin-top: 20px;
    display: none;
}

/* ======== 在这里添加验证码样式 ======== */
/* 验证码样式 - 修改后 */
.captcha-container {
    margin: 20px 0;
}

.captcha-input-group {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.captcha-field {
    flex: 1;
    min-width: 200px;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    font-family: 'Courier New', monospace;
    font-weight: bold;
    letter-spacing: 5px;
    text-align: center;
    transition: var(--transition);
}

.captcha-field:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(0, 86, 166, 0.1);
}

.captcha-field:invalid {
    border-color: var(--secondary);
}

.captcha-code {
    font-family: 'Courier New', monospace;
    font-size: 1.5rem;
    font-weight: bold;
    letter-spacing: 8px;
    background: linear-gradient(45deg, #f5f5f5, #ffffff);
    padding: 10px 20px;
    border-radius: 6px;
    border: 2px dashed #ddd;
    user-select: none;
    min-width: 140px;
    text-align: center;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.captcha-refresh {
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.3rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.captcha-refresh:hover {
    background-color: #004085;
    transform: rotate(180deg);
}

.captcha-error {
    color: var(--secondary);
    font-size: 0.9rem;
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 5px;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .captcha-input-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .captcha-field {
        min-width: 100%;
    }
    
    .captcha-code {
        min-width: 100%;
        letter-spacing: 6px;
    }
}/* ======== 验证码样式结束 ======== */

/* 页脚样式 */
footer {
    background-color: var(--dark);
    color: white;
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}
/* 页脚样式 */
footer {
    background-color: var(--dark);
    color: white;
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 3rem;
}

.footer-column h4 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: #4dabf7;
    position: relative;
    padding-bottom: 10px;
}

.footer-column h4::after {
    content: '';
    position: absolute;
    width: 50px;
    height: 3px;
    background-color: var(--secondary);
    bottom: 0;
    left: 0;
}

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

.footer-column ul li {
    margin-bottom: 12px;
}

.footer-column ul li a {
    color: #ccc;
    text-decoration: none;
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: white;
    padding-left: 5px;
}
footer .footer-column ul.contact-info li i.contact-icon {
    color: #4dabf7;
    margin-top: 3px;
}
.footer-column ul.contact-info li {
    border-bottom: none !important;
    padding-bottom: 0 !important;
    margin-bottom: 12px;
}
/* 确保 contact-info 中的间距一致 */
.footer-column .contact-info li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #495057; /* 添加分割线 */
}

.footer-column .contact-info li:last-child {
    border-bottom: none;
}

.footer-column .contact-info li .contact-icon {
    color: #4dabf7;
    margin-top: 3px;
    flex-shrink: 0; /* 防止图标被压缩 */
}

.footer-column .contact-info li div {
    flex: 1;
    color: #ccc;
    line-height: 1.5;
}
.footer-column ul.contact-info li div {
    color: #ccc;
    text-decoration: none;
    border-bottom: none;
}

.footer-column ul.contact-info li strong {
    color: #ccc;
    text-decoration: none;
}
.contact-info li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.contact-icon {
    color: #4dabf7;
    margin-top: 3px;
}

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #495057;
    color: #aaa;
    font-size: 0.9rem;
}

/* 时间线特定样式 - 在style.css中添加 */
.center-section .timeline {
    position: relative;
    max-width: 800px;
    margin: 50px auto !important;
    padding: 20px 0;
}

.center-section .timeline::before {
    content: '';
    position: absolute;
    width: 6px;
    background-color: var(--primary);
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.center-section .timeline-item {
    position: relative;
    width: 46%;
    margin-bottom: 40px;
    box-sizing: border-box;
}

.center-section .timeline-item:nth-child(odd) {
    float: left;
    clear: left;
    text-align: right;
    padding-right: 60px;
}

.center-section .timeline-item:nth-child(even) {
    float: right;
    clear: right;
    text-align: left;
    padding-left: 60px;
}

.center-section .timeline-content {
    padding: 20px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    position: relative;
}

.center-section .timeline-item::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background-color: white;
    border-radius: 50%;
    border: 4px solid var(--primary);
    top: 20px;
    z-index: 2;
}

.center-section .timeline-item:nth-child(odd)::after {
    right: -13px;
}

.center-section .timeline-item:nth-child(even)::after {
    left: -13px;
}

.center-section .timeline-year {
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.center-section .timeline-content h4 {
    color: var(--dark);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.center-section .timeline-content p {
    color: var(--gray);
    line-height: 1.6;
    margin: 0;
}

.center-section .timeline::after {
    content: '';
    display: table;
    clear: both;
}

/* 证书网格样式 */
.center-section .certificate-grid {
    display: grid !important;
    grid-template-columns: repeat(4, 1fr) !important;
    gap: 30px !important;
    margin-top: 30px !important;
    max-width: 1000px !important;
    margin-left: auto !important;
    margin-right: auto !important;
    padding: 0 !important;
}

.center-section .certificate-item {
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease;
}

.center-section .certificate-item:hover {
    transform: translateY(-5px);
}

.center-section .certificate-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 15px;
}

/* CE标志样式 */
.center-section .ce-symbol {
    font-size: 3.5rem;
    color: var(--primary);
    margin-bottom: 15px;
    display: inline-block;
    font-weight: 900;
    font-family: Arial, sans-serif;
    line-height: 1;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero h2 {
        font-size: 2.2rem;
    }
    
    nav ul {
        gap: 15px;
    }
    
    .contact-container,
    .about-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .contact-info-container {
        padding-right: 0;
    }
    
    .contact-form-container {
        padding-left: 0;
        border-left: none;
        border-top: 1px solid #e0e0e0;
        padding-top: 30px;
    }
    
    .about-image {
        order: -1;
    }
    
    .news-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
    
    /* 响应式调整 */
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* 时间线响应式 */
    .center-section .timeline::before {
        left: 30px !important;
    }
    
    .center-section .timeline-item {
        width: 90% !important;
        float: none !important;
        clear: none !important;
        margin: 0 auto 30px auto !important;
        padding: 0 0 0 70px !important;
        text-align: left !important;
    }
    
    .center-section .timeline-item:nth-child(odd),
    .center-section .timeline-item:nth-child(even) {
        float: none !important;
        clear: none !important;
        text-align: left !important;
        padding-left: 70px !important;
        padding-right: 0 !important;
    }
    
    .center-section .timeline-item::after {
        left: 21px !important;
        right: auto !important;
    }
    
    /* 证书网格响应式 */
    .center-section .certificate-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        max-width: 600px !important;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    nav {
        width: 100%;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.5s ease;
    }
    
    nav.active {
        max-height: 300px;
        margin-top: 20px;
    }
    
    nav ul {
        flex-direction: column;
        gap: 15px;
    }
    
    .hero h2 {
        font-size: 1.8rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .section-title h2 {
        font-size: 2rem;
    }
    
    .product-image {
        height: 180px;
    }
    
    .about-section,
    .contact-section,
    .news-section {
        padding: 30px;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .hero {
        padding: 3rem 1rem;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .product-image {
        height: 160px;
    }
    
    .about-section,
    .contact-section,
    .news-section {
        padding: 25px;
    }
    
    .news-filter {
        gap: 10px;
    }
    
    .filter-btn {
        padding: 8px 20px;
        font-size: 0.9rem;
    }
    
    /* 响应式调整 */
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    /* 证书网格响应式 */
    .center-section .certificate-grid {
        grid-template-columns: 1fr !important;
        max-width: 300px !important;
    }
    
    .center-section .timeline-item {
        width: 95% !important;
        padding-left: 60px !important;
    }
}