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

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    line-height: 1.6;
    background: #f8f9fa;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 头部导航设计 */
.main-header {
    background: #2c3e50;
    color: white;
    padding: 1.5rem 5%;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.nav-list {
    display: flex;
    justify-content: center;
    gap: 2rem;
    list-style: none;
    margin-top: 1rem;
}

.nav-list a {
    color: #ecf0f1;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background 0.3s;
}

.nav-list a:hover {
    background: #34495e;
}

/* 主内容区 */
.content-container {
    flex: 1;
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

.welcome-section {
    text-align: center;
    padding: 3rem 0;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.test-case {
    margin-top: 2rem;
    padding: 1.5rem;
    background: #ffffff;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
}

.case-card {
    padding: 1rem;
    background: #f8f9fa;
    margin-top: 1rem;
}

/* 备案信息区 */
.icp-footer {
    background: #2c3e50;
    color: #bdc3c7;
    padding: 1.5rem 0;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-list {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .content-container {
        padding: 0 1rem;
    }
    
    .welcome-section {
        padding: 2rem 1rem;
    }
}