/* 全局样式 */
:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --text-color: #333;
    --light-text: #666;
    --bg-color: #fff;
    --light-bg: #f8fafc;
    --dark-bg: #1e293b;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--bg-color);
}

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

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

ul {
    list-style: none;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--primary-color);
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 4px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* 导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--bg-color);
    box-shadow: var(--shadow);
    z-index: 1000;
    padding: 15px 0;
}

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

.logo img {
    height: 40px;
}

.main-nav ul {
    display: flex;
}

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

.main-nav a {
    font-weight: 500;
    position: relative;
}

.main-nav a:after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.main-nav a:hover:after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 2px 0;
    transition: var(--transition);
}

/* 横幅区域 */
.hero {
    padding: 150px 0 100px;
    background: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
    color: white;
    text-align: center;
}

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

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

/* 主要功能区 */
.features {
    padding: 100px 0;
    background-color: var(--light-bg);
}

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

.feature-card {
    background-color: var(--bg-color);
    border-radius: 8px;
    padding: 30px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.feature-card p {
    margin-bottom: 20px;
    color: var(--light-text);
}

/* 产品优势区 */
.advantages {
    padding: 100px 0;
}

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

.advantage-card {
    text-align: center;
    padding: 20px;
}

.advantage-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.advantage-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
}

.advantage-card p {
    color: var(--light-text);
}

/* 成功案例区 */
.case-studies {
    padding: 100px 0;
    background-color: var(--light-bg);
}

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

.case-card {
    background-color: var(--bg-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.case-image {
    height: 200px;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.case-card:hover .case-image img {
    transform: scale(1.1);
}

.case-content {
    padding: 20px;
}

.case-content h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.case-content p {
    color: var(--light-text);
}

.case-studies-more {
    text-align: center;
    margin-top: 40px;
}

/* 联系我们区 */
.contact-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
    color: white;
    text-align: center;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

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

.contact-content p {
    margin-bottom: 30px;
    opacity: 0.9;
}

/* 页脚 */
.footer {
    background-color: var(--dark-bg);
    color: white;
    padding: 80px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.footer-col h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    position: relative;
}

.footer-col h3:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 40px;
    height: 3px;
    background-color: var(--accent-color);
}

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

.footer-col ul li a:hover {
    color: var(--accent-color);
}

.contact-info li {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

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

.social-links {
    display: flex;
    margin-top: 20px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    margin-right: 10px;
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--accent-color);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-links a {
    margin-left: 20px;
    opacity: 0.7;
}

.footer-links a:hover {
    opacity: 1;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .header .container {
        flex-wrap: wrap;
    }
    
    .main-nav {
        display: none;
        width: 100%;
        order: 3;
        margin-top: 20px;
    }
    
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
    }
    
    .main-nav li {
        margin: 0;
        margin-bottom: 15px;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        margin-top: 15px;
    }
    
    .footer-links a {
        margin: 0 10px;
    }
}

@media (max-width: 576px) {
    .section-title {
        font-size: 1.8rem;
    }
    
    .feature-card, .advantage-card, .case-card {
        padding: 20px;
    }
    
    .contact-content h2 {
        font-size: 2rem;
    }
}

/* 页面标题区域 */
.page-title {
    padding: 100px 0 40px;
    background-color: var(--light-bg);
    margin-top: 70px;
    text-align: center;
}

.page-title h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-color);
}

.page-title .breadcrumb {
    color: var(--light-text);
    font-size: 1rem;
}

.page-title .breadcrumb a {
    color: var(--primary-color);
}

.page-title .breadcrumb a:hover {
    text-decoration: underline;
}

/* 内容区布局 */
.content-section {
    padding: 40px 0;
    margin-top: 70px;
}

.content-grid {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 40px;
}

/* 侧边栏样式 */
.sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
    background-color: var(--bg-color);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 20px;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
}

.sidebar-nav li {
    margin-bottom: 10px;
}

.sidebar-nav a {
    display: block;
    padding: 12px 15px;
    color: var(--text-color);
    border-radius: 6px;
    transition: var(--transition);
    font-weight: 500;
    position: relative;
}

.sidebar-nav a:hover {
    background-color: var(--light-bg);
    color: var(--primary-color);
}

.sidebar-nav a.active {
    background-color: var(--primary-color);
    color: white;
}

.sidebar-nav a.active:before {
    content: '';
    position: absolute;
    left: -20px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 20px;
    background-color: var(--primary-color);
}

/* 主要内容区样式 */
.main-content {
    background-color: var(--bg-color);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 30px;
}

.content-block {
    margin-bottom: 40px;
}

.content-block:last-child {
    margin-bottom: 0;
}

.content-block h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--text-color);
}

/* 响应式设计 */
@media (max-width: 992px) {
    .content-grid {
        grid-template-columns: 200px 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: relative;
        top: 0;
        margin-bottom: 20px;
    }
    
    .sidebar-nav {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .sidebar-nav li {
        margin-bottom: 0;
    }
    
    .sidebar-nav a {
        padding: 8px 15px;
        font-size: 0.9rem;
    }
    
    .sidebar-nav a.active:before {
        display: none;
    }
}