/* 全局样式 */
:root {
    --primary-color: #4e6ef2;
    --secondary-color: #f5f7ff;
    --text-color: #333;
    --card-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
    --card-hover-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    --card-border-radius: 16px;
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #f8f9fa;
    padding: 20px;
}

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

/* 头部样式 */
header {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px 0;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.2rem;
    color: #666;
}

/* 卡片容器 */
.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

/* 卡片样式 */
.card {
    background: white;
    border-radius: var(--card-border-radius);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    height: 100%;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-hover-shadow);
}

.card-icon {
    background-color: var(--secondary-color);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 30px 0;
}

.card-icon i {
    font-size: 3rem;
    color: var(--primary-color);
}

.card-content {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-content h2 {
    font-size: 1.4rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.card-content p {
    color: #666;
    line-height: 1.5;
}

/* 页脚样式 */
footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px 0;
    color: #666;
    border-top: 1px solid #eee;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .cards-container {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    header {
        margin-bottom: 20px;
    }
    
    .cards-container {
        grid-template-columns: 1fr;
    }
}