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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background: #f5f5f5;
    min-height: 100vh;
    margin: 0;
    padding: 0;
}

.container {
    width: 100%;
    min-height: 100vh;
    margin: 0;
    background: white;
    overflow: auto;
}

.header {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.nav-tabs {
    display: flex;
    background: #f8f9fa;
    border-bottom: 1px solid #dee2e6;
}

.nav-tab {
    flex: 1;
    padding: 15px 20px;
    text-align: center;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    color: #6c757d;
    transition: all 0.3s ease;
}

.nav-tab.active {
    background: white;
    color: #4facfe;
    border-bottom: 3px solid #4facfe;
}

.nav-tab:hover {
    background: #e9ecef;
}

.tab-content {
    display: none;
    padding: 30px 0;
}

.tab-content.active {
    display: block;
}

/* 详情页样式 */
.detail-back-btn {
    background: #6c757d;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 5px;
    font-size: 14px;
    cursor: pointer;
    margin-bottom: 20px;
    transition: background 0.3s ease;
}

.detail-back-btn:hover {
    background: #5a6268;
}

.message-detail {
    background: white;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.detail-title {
    font-size: 24px;
    font-weight: bold;
    color: #333;
    margin-bottom: 15px;
    border-bottom: 2px solid #4facfe;
    padding-bottom: 10px;
}

.detail-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    color: #6c757d;
    font-size: 14px;
}

.detail-content {
    color: #333;
    line-height: 1.8;
    font-size: 16px;
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #4facfe;
}

.detail-status {
    padding: 6px 15px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
}

/* 留言列表样式 */
.message-list {
    display: grid;
    gap: 20px;
}

.message-item {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
    border-left: 4px solid #4facfe;
    transition: transform 0.2s ease;
    cursor: pointer;
}

.message-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    background: #e9ecef;
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.message-title {
    font-size: 18px;
    font-weight: bold;
    color: #333;
}

.message-time {
    color: #6c757d;
    font-size: 14px;
}

.message-author {
    color: #495057;
    margin-bottom: 10px;
}

.message-content {
    color: #666;
    line-height: 1.6;
}

.status-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
}

.status-processing {
    background: #fff3cd;
    color: #856404;
}

.status-replied {
    background: #d4edda;
    color: #155724;
}

/* 加载更多样式 */
.load-more {
    text-align: center;
    padding: 20px;
    margin-top: 20px;
}

.load-more-btn {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.load-more-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(79, 172, 254, 0.3);
}

.load-more-btn:disabled {
    background: #e9ecef;
    color: #adb5bd;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #4facfe;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 8px;
}

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

.page-info {
    text-align: center;
    color: #6c757d;
    font-size: 12px;
    margin-top: 10px;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 5px;
}

/* 提交表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #333;
}

.form-input, .form-textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-input:focus, .form-textarea:focus {
    outline: none;
    border-color: #4facfe;
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.checkbox-input {
    width: 18px;
    height: 18px;
}

.submit-btn {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s ease;
    width: 100%;
}

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

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #6c757d;
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 20px;
    opacity: 0.5;
}

@media (max-width: 768px) {
    .container {
        width: 100%;
        min-height: 100vh;
        margin: 0;
    }
    
    .header {
        padding: 20px;
    }
    
    .header h1 {
        font-size: 2em;
    }
    
    .tab-content {
        padding: 20px 0;
    }
    
    .message-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .load-more-btn {
        padding: 10px 20px;
        font-size: 13px;
        width: 90%;
        max-width: 300px;
    }

    .page-info {
        font-size: 11px;
        padding: 8px;
    }
}

/* 回复相关样式 */
.reply-section {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid #e9ecef;
}

.reply-header h3 {
    color: #28a745;
    font-size: 18px;
    margin-bottom: 10px;
    font-weight: bold;
}

.reply-meta {
    color: #6c757d;
    font-size: 14px;
    margin-bottom: 15px;
}

.reply-content {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #28a745;
    color: #333;
    line-height: 1.6;
    font-size: 15px;
}

.reply-content:empty::before {
    content: "暂无回复内容";
    color: #6c757d;
    font-style: italic;
}