/* 全局样式 */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --error-color: #e74c3c;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --bg-color: #ecf0f1;
    --text-color: #333;
    --border-color: #ddd;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 2rem;
    padding: 1rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: 5px;
}

h1, h2, h3 {
    margin-bottom: 1rem;
}

section {
    margin-bottom: 2rem;
    background-color: white;
    padding: 1.5rem;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* 数据库表格显示区域 */
.table-container {
    border: 1px solid var(--border-color);
    border-radius: 5px;
    overflow: hidden;
    margin-top: 15px;
}

.table-selector {
    display: flex;
    align-items: center;
    padding: 10px;
    background-color: #f5f5f5;
    border-bottom: 1px solid var(--border-color);
}

.table-selector label {
    margin-right: 10px;
}

.table-selector select {
    margin-right: 15px;
}

#show-table {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 7px 14px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
}

#show-table:hover {
    background-color: #2980b9;
}

#table-display {
    padding: 15px;
    max-height: 300px;
    overflow-y: auto;
}

.table-info {
    margin-bottom: 10px;
    padding: 10px;
    background-color: #f8f9fa;
    border-left: 4px solid var(--secondary-color);
}

/* SQL编辑器 */
.editor-container {
    border: 1px solid var(--border-color);
    border-radius: 5px;
    overflow: hidden;
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background-color: #f5f5f5;
    border-bottom: 1px solid var(--border-color);
}

#sql-editor {
    width: 100%;
    height: 150px;
    padding: 10px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 14px;
    border: none;
    resize: vertical;
}

#run-query {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
}

#run-query:hover {
    background-color: #2980b9;
}

select {
    padding: 7px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

/* 结果区域 */
.result-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    padding: 8px 16px;
    background: none;
    border: none;
    cursor: pointer;
}

.tab-btn.active {
    border-bottom: 2px solid var(--secondary-color);
    font-weight: bold;
}

.tab-pane {
    display: none;
    padding: 15px;
}

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

.empty-state {
    color: #888;
    text-align: center;
    padding: 20px;
}

/* 表格样式 */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

th, td {
    padding: 8px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: #f5f5f5;
}

tr:hover {
    background-color: #f5f8fa;
}

/* 表格列类型显示 */
.column-type {
    font-size: 12px;
    color: #666;
    font-style: italic;
}

/* 错误信息 */
.error-message {
    padding: 10px;
    background-color: #ffebee;
    border-left: 4px solid var(--error-color);
    margin-bottom: 10px;
}

/* 成功信息 */
.success-message {
    padding: 10px;
    background-color: #e8f5e9;
    border-left: 4px solid var(--success-color);
    margin-bottom: 10px;
}

/* 调试助手 */
.debug-container {
    padding: 15px;
    background-color: #f9f9f9;
    border-radius: 5px;
}

.debug-container.hidden {
    display: none;
}

#error-diagnosis {
    margin-bottom: 15px;
    padding: 10px;
    background-color: #fff3e0;
    border-left: 4px solid var(--warning-color);
}

#solution-hints {
    margin-bottom: 15px;
    padding: 10px;
    background-color: #e0f7fa;
    border-left: 4px solid var(--secondary-color);
}

#learning-resources {
    padding: 10px;
    background-color: #e8f5e9;
    border-left: 4px solid var(--success-color);
}

footer {
    text-align: center;
    margin-top: 2rem;
    padding: 1rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: 5px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .editor-header, .table-selector {
        flex-direction: column;
        gap: 10px;
    }
    
    .scenario-selector, .table-selector select, .table-selector label {
        width: 100%;
    }
    
    #run-query, #show-table {
        width: 100%;
    }
}