/* 基础样式 */
body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: auto;
    overflow: hidden;
}

/* 导航栏样式 */
#navbar {
    background-color: #2c3e50;
    padding: 15px 0;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

#navbar ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

#navbar ul li {
    display: inline;
    margin: 0 20px;
}

#navbar ul li a {
    color: #fff;
    text-decoration: none;
    font-size: 18px;
    transition: color 0.3s ease;
}

#navbar ul li a:hover {
    color: #1abc9c;
}

#navbar.fixed {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(44, 62, 80, 0.9);
    z-index: 1000;
}

#navbar ul li a.active {
    color: #1abc9c;
    font-weight: bold;
}

/* 卡片样式 */
.card {
    background: #fff;
    padding: 20px;
    margin: 20px 0;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.card h3 {
    margin-top: 0;
    color: #2c3e50;
}

.card p {
    margin: 10px 0;
    color: #666;
}

/* 图标样式 */
.fas {
    margin-right: 10px;
    color: #1abc9c;
}

/* 页脚样式 */
footer {
    background: #2c3e50;
    color: #fff;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
}

footer .social-links a {
    color: #fff;
    margin: 0 10px;
    font-size: 20px;
    transition: color 0.3s ease;
}

footer .social-links a:hover {
    color: #1abc9c;
}

/* 动画效果 */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}