/* 主体样式 */
body {
    background-color: #f9f3e9;
    color: #333;
    line-height: 1.6;
    font-family: 'Microsoft YaHei', sans-serif;
}

.section {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: #8b0000;
    position: relative;
    padding-bottom: 1.5rem;
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 150px;
    height: 4px;
    background-color: #8b0000;
}

.discussion-board {
    background-color: white;
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.discussion-board h2 {
    color: #8b0000;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

.discussion-board p {
    margin-bottom: 1.2rem;
    font-size: 1.1rem;
}

.discussion-topics {
    margin-top: 2rem;
}

.topic {
    border-bottom: 1px solid #eee;
    padding: 1.5rem 0;
}

.topic:last-child {
    border-bottom: none;
}

.topic h3 {
    color: #333;
    margin-bottom: 0.8rem;
}

.topic p {
    color: #666;
    margin-bottom: 1rem;
}

.topic-meta {
    display: flex;
    justify-content: space-between;
    color: #888;
    font-size: 0.9rem;
}

.comment-form {
    margin-top: 3rem;
    background-color: #f8f1e1;
    padding: 2rem;
    border-radius: 8px;
}

.comment-form h3 {
    color: #8b0000;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.form-group textarea {
    height: 150px;
    resize: vertical;
}

.submit-btn {
    background-color: #8b0000;
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

.submit-btn:hover {
    background-color: #a52a2a;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    nav ul {
        margin-top: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    nav ul li {
        margin: 0.5rem;
    }
    
    .footer-content {
        flex-direction: column;
    }
}