/* 基础样式 */
:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
    --text-color: #333;
    --text-light: #7f8c8d;
    --white: #fff;
    --black: #000;
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

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

.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 14px;
}

.btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
    box-shadow: var(--box-shadow);
}

.section {
    padding: 80px 0;
}

.section-title {
    font-size: 36px;
    margin-bottom: 15px;
    color: var(--dark-color);
    text-align: center;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 50px;
    font-size: 18px;
}

/* 导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.header.scrolled {
    background-color: var(--white);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}

.logo a {
    display: flex;
    align-items: center;
    color: var(--dark-color);
    font-weight: 700;
    font-size: 22px;
}

.logo img {
    height: 40px;
    margin-right: 10px;
}

.nav ul {
    display: flex;
}

.nav ul li {
    margin-left: 30px;
}

.nav ul li a {
    color: var(--dark-color);
    font-weight: 600;
    position: relative;
    padding: 5px 0;
}

.nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav ul li a:hover::after,
.nav ul li a.active::after {
    width: 100%;
}

.nav ul li a.active {
    color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--dark-color);
}

/* Banner区域 */
.banner {
    height: 50vh;
    min-height: 600px;
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../images/banner.jpg') no-repeat center center/cover;
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--white);
    padding-top: 80px;
}

.banner-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.banner h1 {
    font-size: 48px;
    margin-bottom: 20px;
    line-height: 1.2;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.banner p {
    font-size: 20px;
    margin-bottom: 30px;
}

/* 旗下网站 */
.sites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.site-item {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    position: relative;
}

.site-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.site-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.site-info {
    padding: 20px;
    background-color: var(--white);
}

.site-info h3 {
    margin-bottom: 10px;
    color: var(--dark-color);
}

.site-info p {
    color: var(--text-light);
}

/* 服务项目 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.service-item {
    text-align: center;
    padding: 40px 30px;
    background-color: var(--white);
    border-radius: 10px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.service-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background-color: var(--light-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    color: var(--primary-color);
}

.service-item h3 {
    margin-bottom: 15px;
    color: var(--dark-color);
}

/* 公司作品 */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.portfolio-item {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.portfolio-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    display: block;
    transition: var(--transition);
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(52, 152, 219, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
    padding: 20px;
    text-align: center;
    color: var(--white);
}

.portfolio-overlay h3 {
    margin-bottom: 10px;
    font-size: 22px;
}

.portfolio-overlay p {
    margin-bottom: 20px;
}

.view-btn {
    padding: 10px 25px;
    background-color: var(--white);
    color: var(--primary-color);
    border-radius: 5px;
    font-weight: 600;
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-item:hover img {
    transform: scale(1.1);
}

/* 关于我们 */
.about-section .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-image img {
    border-radius: 10px;
    box-shadow: var(--box-shadow);
}

.about-text p {
    margin-bottom: 20px;
    line-height: 1.8;
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background-color: var(--light-color);
    border-radius: 10px;
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-text {
    font-size: 16px;
    color: var(--text-light);
}

/* 联系我们 */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    margin-top: 50px;
}

.contact-info h3,
.contact-form h3 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--dark-color);
}

.contact-info ul li {
    margin-bottom: 20px;
    display: flex;
    align-items: flex-start;
}

.contact-info ul li i {
    margin-right: 15px;
    font-size: 20px;
    color: var(--primary-color);
}

.social-links h3 {
    margin-top: 30px;
}

.social-icons {
    display: flex;
    gap: 15px;
    margin-top: 15px;
}

.social-icons a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--light-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--dark-color);
    transition: var(--transition);
}

.social-icons a:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

.qrcode-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    background-color: var(--white);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    z-index: 1100;
    transition: var(--transition);
    text-align: center;
}

.qrcode-popup.active {
    transform: translate(-50%, -50%) scale(1);
}

.qrcode-popup img {
    width: 200px;
    height: 200px;
    margin-bottom: 15px;
}

.close-qrcode {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 24px;
    cursor: pointer;
    color: var(--dark-color);
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
    font-size: 16px;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

/* 页脚 */
.footer {
    background-color: var(--dark-color);
    color: var(--white);
    padding: 60px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.footer-about .logo {
    margin-bottom: 20px;
}

.footer-about .logo a {
    color: var(--white);
}

.footer-about p {
    margin-bottom: 20px;
    line-height: 1.8;
}

.footer-links h3,
.footer-services h3,
.footer-contact h3 {
    font-size: 20px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-links h3::after,
.footer-services h3::after,
.footer-contact h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 2px;
    background-color: var(--primary-color);
}

.footer-links ul li,
.footer-services ul li {
    margin-bottom: 10px;
}

.footer-links ul li a,
.footer-services ul li a {
    color: var(--light-color);
    transition: var(--transition);
}

.footer-links ul li a:hover,
.footer-services ul li a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-contact ul li {
    margin-bottom: 15px;
    display: flex;
    align-items: flex-start;
}

.footer-contact ul li i {
    margin-right: 10px;
    color: var(--primary-color);
}

.footer-bottom {
    padding: 20px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-social {
    margin-top: 15px;
}

.footer-social a {
    display: inline-block;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white);
    margin: 0 5px;
    text-align: center;
    line-height: 40px;
    transition: var(--transition);
}

.footer-social a:hover {
    background-color: var(--primary-color);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: var(--box-shadow);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

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

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

/* 移动端菜单 */
.mobile-menu {
    position: fixed;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100vh;
    background-color: var(--white);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.mobile-menu.active {
    left: 0;
}

.mobile-menu ul {
    text-align: center;
}

.mobile-menu ul li {
    margin-bottom: 30px;
}

.mobile-menu ul li a {
    font-size: 24px;
    color: var(--dark-color);
    font-weight: 600;
}

.mobile-menu ul li a.active {
    color: var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 992px) {
    .about-section .container {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        order: -1;
    }
    
    .contact-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav ul {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .banner h1 {
        font-size: 36px;
    }
    
    .banner p {
        font-size: 18px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 30px;
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .banner h1 {
        font-size: 28px;
    }
    
    .banner p {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 26px;
    }
    
    .section-subtitle {
        font-size: 16px;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 12px;
    }
}
.footer-bottom a {
    color: var(--light-color);
    margin-left: 15px;
    transition: var(--transition);
}

.footer-bottom a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}
.national-emblem, .police-badge {
    width: 16px;
    height: 16px;
    margin-right: 6px;
    vertical-align: text-bottom;
}

.icp-info {
    display: inline-flex;
    align-items: center;
    margin-left: 15px;
}