/* 基础样式 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

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

body {
    font-family: 'Inter', sans-serif;
    background-color: #f8f9fa;
    color: #212529;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 导航栏样式 */
header {
    background-color: #ffffff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2563eb;
    text-decoration: none;
}

.nav-links {
    display: flex;
    align-items: center;
}

.nav-links a {
    margin-left: 1.5rem;
    text-decoration: none;
    color: #4b5563;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: #2563eb;
}

/* 主内容区域 */
main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

/* 页脚样式 */
footer {
    background-color: #ffffff;
    border-top: 1px solid #e5e7eb;
    padding: 2rem;
    text-align: center;
    margin-top: auto;
}

.footer-links {
    margin-bottom: 1rem;
}

.footer-links a {
    margin: 0 0.5rem;
    color: #4b5563;
    text-decoration: none;
}

.footer-links a:hover {
    text-decoration: underline;
}

footer p {
    color: #6b7280;
    font-size: 0.875rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        padding: 1rem;
    }
    
    .nav-links {
        margin-top: 1rem;
        width: 100%;
        justify-content: space-around;
    }
    
    .nav-links a {
        margin: 0;
    }
}

/* 功能卡片样式 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background-color: #ffffff;
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}

.feature-icon {
    height: 160px;
    background-color: #f3f4f6;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon img {
    height: 64px;
    width: 64px;
}

.feature-content {
    padding: 1.5rem;
}

.feature-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: #1f2937;
}

.feature-content p {
    color: #6b7280;
    margin-bottom: 1rem;
}

.feature-button {
    display: inline-block;
    background-color: #2563eb;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.feature-button:hover {
    background-color: #1d4ed8;
}