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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

a {
    text-decoration: none;
    color: #0066cc;
}

ul {
    list-style: none;
}

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

/* 头部样式 */
header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 15px;
}

.logo h1 {
    font-size: 24px;
    color: #0066cc;
    margin-bottom: 5px;
}

.logo p {
    font-size: 14px;
    color: #666;
}

nav ul {
    display: flex;
}

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

nav ul li a {
    color: #333;
    font-weight: 500;
    padding: 10px 0;
    position: relative;
    transition: color 0.3s;
}

nav ul li a:hover,
nav ul li a.active {
    color: #0066cc;
}

nav ul li a.active:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: #0066cc;
}

/* 英雄区域样式 */
.hero {
    background: linear-gradient(135deg, #0066cc, #004080);
    color: #fff;
    padding: 80px 0;
    text-align: center;
}

.hero h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.hero p {
    font-size: 18px;
    max-width: 700px;
    margin: 0 auto 30px;
}

.btn {
    display: inline-block;
    background-color: #fff;
    color: #0066cc;
    padding: 12px 30px;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.3s;
}

.btn:hover {
    background-color: #f0f0f0;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

/* 案例研究区域样式 */
.case-studies {
    padding: 80px 0;
}

.case-studies h2 {
    text-align: center;
    font-size: 32px;
    margin-bottom: 10px;
}

.case-studies > .container > p {
    text-align: center;
    color: #666;
    margin-bottom: 40px;
}

.filter-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.filter-btn {
    background: none;
    border: none;
    padding: 10px 20px;
    margin: 0 5px 10px;
    cursor: pointer;
    font-size: 16px;
    border-radius: 20px;
    transition: all 0.3s;
}

.filter-btn:hover {
    color: #0066cc;
}

.filter-btn.active {
    background-color: #0066cc;
    color: #fff;
}

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

.case-card {
    background-color: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

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

.case-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.case-card:hover .case-img img {
    transform: scale(1.05);
}

.case-content {
    padding: 20px;
}

.case-tag {
    display: inline-block;
    background-color: #e6f0ff;
    color: #0066cc;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 12px;
    margin-bottom: 10px;
}

.case-content h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #333;
}

.case-content p {
    color: #666;
    margin-bottom: 15px;
    font-size: 14px;
}

.read-more {
    display: inline-block;
    color: #0066cc;
    font-weight: 600;
    font-size: 14px;
    position: relative;
}

.read-more:after {
    content: '→';
    margin-left: 5px;
    transition: transform 0.3s;
}

.read-more:hover:after {
    transform: translateX(5px);
}

/* 关于我们区域样式 */
.about {
    background-color: #f0f7ff;
    padding: 80px 0;
    text-align: center;
}

.about h2 {
    font-size: 32px;
    margin-bottom: 20px;
}

.about p {
    max-width: 800px;
    margin: 0 auto 20px;
    color: #555;
}

/* 页脚样式 */
footer {
    background-color: #333;
    color: #fff;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.footer-logo h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.footer-logo p {
    color: #aaa;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 16px;
    margin-bottom: 15px;
    color: #fff;
}

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

.footer-links ul li a {
    color: #aaa;
    transition: color 0.3s;
}

.footer-links ul li a:hover {
    color: #fff;
}

.footer-contact p {
    color: #aaa;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #444;
}

.footer-bottom p {
    color: #aaa;
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
    }
    
    nav ul {
        margin-top: 20px;
    }
    
    nav ul li {
        margin: 0 10px;
    }
    
    .hero {
        padding: 60px 0;
    }
    
    .hero h2 {
        font-size: 28px;
    }
    
    .case-studies,
    .about {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .hero h2 {
        font-size: 24px;
    }
    
    .filter-btn {
        padding: 8px 15px;
        font-size: 14px;
    }
}