body {
    font-family: sans-serif;
    background: #f5f5f5;
    color: #333;
    margin: 0;
}

header {
    background: #a4d4ae;
    padding: 1em;
    text-align: center;
}

nav a {
    margin: 0 10px;
    color: #000;
    text-decoration: none;
}

main {
    padding: 2em;
    background: white;
    margin: 1em auto;
    max-width: 800px; /* ⬅ 增大页面宽度以适配图片 */
    border-radius: 8px;
}

footer {
    text-align: center;
    padding: 1em;
    background: #ddd;
}

form input,
form select,
form textarea {
    width: 100%;
    margin: 5px 0 15px;
    padding: 8px;
}

button {
    padding: 10px 20px;
}

/* ✅ 新增：服务介绍区域样式 */
.course {
    margin-bottom: 2.5em;
    border-bottom: 1px solid #ccc;
    padding-bottom: 1.5em;
}

.course-img {
    width: 100%;
    max-height: 300px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1em;
}