/* style.css - 留言板样式 */
:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --gray-color: #95a5a6;
    --border-radius: 10px;
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, var(--primary-color), #2980b9);
    color: white;
    padding: 30px 40px;
    text-align: center;
}

.header-content h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* 公告样式 */
.notice-box {
    background: linear-gradient(to right, #fff8e1, #fff);
    border-left: 5px solid var(--warning-color);
    margin: 20px;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: 0 3px 10px rgba(0,0,0,0.05);
}

.notice-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.notice-header i {
    color: var(--warning-color);
    font-size: 1.2rem;
}

.notice-content ol {
    margin-left: 20px;
    color: #555;
}

.notice-content li {
    margin-bottom: 8px;
    padding-left: 5px;
}

/* 顶部导航 */
.top-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: var(--light-color);
    margin: 0 20px;
    border-radius: var(--border-radius);
}

.return-btn {
    background: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border-radius: 50px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.return-btn:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

.stats {
    display: flex;
    gap: 20px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--dark-color);
    font-weight: 500;
}

/* 留言表单 */
.message-form {
    padding: 30px 20px;
    background: white;
}

.form-header {
    text-align: center;
    margin-bottom: 25px;
}

.form-header h3 {
    color: var(--dark-color);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.form-header p {
    color: var(--gray-color);
}

.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: var(--border-radius);
    font-size: 1rem;
    resize: vertical;
    transition: var(--transition);
}

.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

.textarea-footer {
    display: flex;
    justify-content: space-between;
    margin-top: 10px;
    color: var(--gray-color);
    font-size: 0.9rem;
}

.hint {
    display: flex;
    align-items: center;
    gap: 5px;
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.submit-btn, .preview-btn {
    padding: 12px 30px;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    font-weight: 500;
}

.submit-btn {
    background: var(--primary-color);
    color: white;
}

.submit-btn:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

.preview-btn {
    background: var(--light-color);
    color: var(--dark-color);
}

.preview-btn:hover {
    background: #d5dbdb;
    transform: translateY(-2px);
}

.small {
    padding: 8px 20px;
    font-size: 0.9rem;
}

/* 分割线 */
.section-divider {
    text-align: center;
    padding: 15px;
    background: var(--light-color);
    color: var(--dark-color);
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

/* 留言列表 */
.messages-list {
    padding: 20px;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-color);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.5;
}

.message-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    border: 1px solid #eee;
    transition: var(--transition);
}

.message-card:hover {
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
    transform: translateY(-3px);
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.user-avatar.guest {
    background: linear-gradient(135deg, #9b59b6, #8e44ad);
}

.user-avatar.admin {
    background: linear-gradient(135deg, var(--primary-color), #2980b9);
}

.user-name {
    font-weight: 600;
    color: var(--dark-color);
}

.message-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--gray-color);
    font-size: 0.9rem;
}

.time {
    display: flex;
    align-items: center;
    gap: 5px;
}

.msg-id {
    background: var(--light-color);
    padding: 3px 8px;
    border-radius: 20px;
    font-size: 0.8rem;
}

.message-content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #444;
    margin-bottom: 20px;
    padding: 0 5px;
}

.message-actions {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.reply-btn, .share-btn, .delete-btn {
    padding: 8px 20px;
    border: none;
    border-radius: 50px;
    background: var(--light-color);
    color: var(--dark-color);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    font-size: 0.9rem;
    text-decoration: none;
}

.reply-btn:hover {
    background: var(--primary-color);
    color: white;
}

.share-btn:hover {
    background: var(--secondary-color);
    color: white;
}

.delete-btn {
    background: var(--danger-color);
    color: white;
}

.delete-btn:hover {
    background: #c0392b;
    transform: translateY(-2px);
}

/* 回复表单 */
.reply-form {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px dashed #eee;
}

.form-footer {
    display: flex;
    gap: 15px;
    margin-top: 15px;
    align-items: center;
}

.admin-password {
    flex: 1;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
}

/* 回复列表 */
.replies {
    margin-top: 25px;
    padding-left: 20px;
    border-left: 3px solid var(--light-color);
}

.reply-item {
    background: #f8f9fa;
    border-radius: var(--border-radius);
    padding: 15px;
    margin-bottom: 15px;
    border: 1px solid #e9ecef;
}

.reply-item.admin {
    background: #e8f4fc;
    border-color: #d1ecf1;
}

.reply-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.reply-header .user-avatar {
    width: 30px;
    height: 30px;
    font-size: 0.9rem;
}

.reply-content {
    color: #555;
    line-height: 1.6;
}

/* 分页样式 */
.pagination-wrapper {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.page-link {
    display: inline-block;
    padding: 8px 16px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition);
}

.page-link:hover, .page-link.current {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pagination-info {
    text-align: center;
    color: var(--gray-color);
    font-size: 0.9rem;
}

/* 页脚 */
.footer {
    background: var(--dark-color);
    color: white;
    text-align: center;
    padding: 30px 20px;
    margin-top: 40px;
}

.footer-links {
    margin-top: 15px;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.footer-links a {
    color: #bdc3c7;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #eee;
}

.modal-header h3 {
    color: var(--dark-color);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--gray-color);
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--danger-color);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid #eee;
    display: flex;
    justify-content: flex-end;
    gap: 15px;
}

.btn {
    padding: 10px 25px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

.btn.primary {
    background: var(--primary-color);
    color: white;
}

.btn.secondary {
    background: var(--light-color);
    color: var(--dark-color);
}

.btn:hover {
    transform: translateY(-2px);
}

/* 预览消息 */
.preview-message {
    background: #f8f9fa;
    padding: 20px;
    border-radius: var(--border-radius);
    border: 1px solid #e9ecef;
}

/* 警告框样式 */
.warning-box {
    background: linear-gradient(to right, #fff8e1, #fff);
    border-left: 5px solid var(--warning-color);
    margin: 20px;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: 0 3px 10px rgba(0,0,0,0.05);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        border-radius: 0;
    }
    
    body {
        padding: 0;
    }
    
    .header {
        padding: 20px;
    }
    
    .header-content h1 {
        font-size: 1.8rem;
    }
    
    .top-navigation {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .stats {
        justify-content: center;
    }
    
    .message-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .message-meta {
        width: 100%;
        justify-content: space-between;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .form-footer {
        flex-direction: column;
    }
    
    .admin-password {
        width: 100%;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 10px;
    }
    
    .pagination {
        gap: 5px;
    }
    
    .page-link {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
    
    .message-actions {
        flex-wrap: wrap;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.message-card {
    animation: fadeIn 0.5s ease-out;
}

/* 成功消息样式 */
.success-message {
    background: linear-gradient(to right, #d4edda, #c3e6cb);
    color: #155724;
    padding: 15px 20px;
    border-radius: var(--border-radius);
    margin: 20px;
    border-left: 5px solid var(--secondary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.success-message i {
    color: var(--secondary-color);
}

/* 错误消息样式 */
.error-message {
    background: linear-gradient(to right, #f8d7da, #f5c6cb);
    color: #721c24;
    padding: 15px 20px;
    border-radius: var(--border-radius);
    margin: 20px;
    border-left: 5px solid var(--danger-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.error-message i {
    color: var(--danger-color);
}

/* 加载动画 */
.loading-spinner {
    border: 3px solid var(--light-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}