:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-bg: #f5f6fa;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

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

/* 头部样式 */
.header {
    background: var(--gradient);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo h1 {
    color: var(--white);
    font-size: 1.5rem;
    margin: 0;
}

.nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav a {
    color: var(--white);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.nav a:hover,
.nav a.active {
    background-color: rgba(255,255,255,0.2);
}

/* 英雄区域 */
.hero {
    background: var(--gradient);
    padding: 8rem 0 4rem;
    color: var(--white);
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--white);
}

.btn-secondary {
    background-color: rgba(255,255,255,0.2);
    color: var(--white);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* 成就展示 */
.achievements {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
    font-size: 2rem;
}

.achievement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.achievement-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.achievement-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.achievement-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.achievement-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* 页脚样式 */
.footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 2rem 0;
}

.footer-content {
    text-align: center;
}

.footer-info p {
    margin: 0.5rem 0;
    opacity: 0.9;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .nav ul {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .hero {
        padding: 6rem 0 3rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
}

/* 核心资质展示 */
.highlights {
    padding: 4rem 0;
}

.highlight-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.highlight-item {
    padding: 2rem;
    background-color: var(--light-bg);
    border-radius: 8px;
    text-align: center;
}

/* 证书页面样式 */
.certificates {
    padding: 4rem 0;
}

.cert-category {
    margin-bottom: 3rem;
}

.cert-category h2 {
    color: var(--secondary-color);
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
    margin-bottom: 2rem;
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.cert-item {
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.cert-item:hover {
    transform: translateY(-5px);
}

.cert-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.cert-item ul {
    list-style-position: inside;
    padding-left: 0;
}

.cert-item li {
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.cert-item.highlight {
    border: 2px solid var(--secondary-color);
    background-color: rgba(52, 152, 219, 0.1);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    .nav li {
        margin: 0.5rem 0;
    }

    .cert-grid {
        grid-template-columns: 1fr;
    }
    
    .cert-item {
        margin-bottom: 1rem;
    }
}

/* 证书图片展示样式 */
.cert-image {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: 4px;
    margin: 1rem 0;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.cert-image:hover {
    transform: scale(1.05);
}

/* 证书图片预览模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    z-index: 1000;
}

.modal-content {
    max-width: 90%;
    max-height: 90vh;
    margin: auto;
    display: block;
    position: relative;
    top: 50%;
    transform: translateY(-50%);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
}

/* 导航切换按钮 */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    position: relative;
    z-index: 1001;
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--white);
    margin: 5px 0;
    transition: all 0.3s ease;
}

/* 移动端导航样式 */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: var(--primary-color);
        padding: 6rem 2rem 2rem;
        transition: right 0.3s ease;
    }

    .nav.active {
        right: 0;
    }

    .nav ul {
        flex-direction: column;
        gap: 2rem;
    }

    .nav a {
        font-size: 1.2rem;
        display: block;
        width: 100%;
    }

    /* 汉堡菜单动画 */
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
}

/* 联系方式页面样式 */
.contact {
    padding: 8rem 0 4rem;
    background-color: var(--light-bg);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.contact-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.contact-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.contact-item p {
    margin: 0.5rem 0;
    color: var(--text-color);
}

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

.contact-item a:hover {
    color: var(--primary-color);
}

.location-link {
    color: var(--text-color) !important;
    text-decoration: none;
    display: inline-block;
    position: relative;
    padding-bottom: 0.5rem;
}

.location-link::after {
    content: '📍 打开地图';
    display: block;
    font-size: 0.8rem;
    color: var(--secondary-color);
    margin-top: 0.5rem;
}

.location-link:hover {
    color: var(--secondary-color) !important;
}

.location-detail {
    font-size: 0.9rem;
    color: #666;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .contact {
        padding: 6rem 0 3rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        padding: 0 1rem;
    }
}