* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: Arial, sans-serif;
    font-size: 14px;
    color: #333;
    background: #f5f7fa;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}
/* 导航 */
.nav {
    background: #2d8cf0;
    height: 50px;
    line-height: 50px;
}
.nav a {
    color: #fff;
    padding: 0 15px;
    display: inline-block;
    text-decoration: none;
}
.nav a:hover {
    background: #1b76d4;
}
/* Banner */
.banner {
    height: 200px;
    background: linear-gradient(90deg, #2d8cf0, #56abff);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 15px 0;
    border-radius: 8px;
}
/* 卡片 */
.card {
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin: 10px 0;
}
/* 头像 */
.avatar {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid #2d8cf0;
}
/* 表单 */
.form-item {
    margin: 15px 0;
}
.form-item label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}
.form-item input, .form-item textarea, .form-item select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}
button {
    background: #2d8cf0;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
}
/* 底部 */
.footer {
    text-align: center;
    padding: 20px;
    background: #fff;
    margin-top: 30px;
    border-top: 1px solid #eee;
}
/* 响应式 */
@media (max-width: 768px) {
    .nav a {
        padding: 0 8px;
        font-size: 12px;
    }
    .banner {
        height: 150px;
    }
}