/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', sans-serif;
}

body {
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-bottom: 20px;
}

header h1 {
    margin-bottom: 10px;
}

h2 {
    color: #2c3e50;
    margin-bottom: 15px;
    border-bottom: 2px solid #3498db;
    padding-bottom: 5px;
}

footer {
    text-align: center;
    margin-top: 30px;
    padding: 15px;
    background-color: #2c3e50;
    color: white;
}

/* 表格样式 */
.tables-container {
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    padding: 15px;
    margin-bottom: 20px;
}

.tables {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.table {
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 10px;
    min-width: 200px;
    background-color: #f9f9f9;
}

.table h3 {
    color: #3498db;
    margin-bottom: 10px;
    text-align: center;
}

.table-fields {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.field {
    padding: 5px 10px;
    background-color: #e7f4ff;
    border: 1px solid #bde0fe;
    border-radius: 3px;
    cursor: move;
    transition: all 0.2s;
}

.field:hover {
    background-color: #d0e8ff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 运算符样式 */
.operators-container {
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    padding: 15px;
    margin-bottom: 20px;
}

.operators {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.operator {
    padding: 8px 15px;
    background-color: #fff3cd;
    border: 1px solid #ffeeba;
    border-radius: 3px;
    cursor: move;
    font-weight: bold;
    transition: all 0.2s;
}

.operator:hover {
    background-color: #ffecb5;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 查询构建器样式 */
.query-builder {
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    padding: 15px;
    margin-bottom: 20px;
}

.query-area {
    min-height: 150px;
    border: 2px dashed #3498db;
    border-radius: 5px;
    padding: 15px;
    margin-bottom: 15px;
    background-color: #f8f9fa;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-content: flex-start;
}

.placeholder {
    color: #6c757d;
    width: 100%;
    text-align: center;
    padding: 50px 0;
}

.query-item {
    position: relative;
    padding: 8px 15px;
    border-radius: 3px;
    display: inline-block;
    margin: 5px;
}

.query-field {
    background-color: #e7f4ff;
    border: 1px solid #bde0fe;
}

.query-operator {
    background-color: #fff3cd;
    border: 1px solid #ffeeba;
    font-weight: bold;
}

.condition {
    display: flex;
    align-items: center;
    gap: 5px;
    margin: 5px 0;
    padding: 5px;
    background-color: #f8f9fa;
    border-radius: 3px;
    border: 1px solid #ddd;
}

.buttons {
    display: flex;
    gap: 10px;
}

button {
    padding: 8px 15px;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.2s;
}

#execute-btn {
    background-color: #28a745;
    color: white;
}

#execute-btn:hover {
    background-color: #218838;
}

#clear-btn {
    background-color: #dc3545;
    color: white;
}

#clear-btn:hover {
    background-color: #c82333;
}

/* 结果区域样式 */
.results-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.sql-result, .tree-result, .table-result {
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    padding: 15px;
}

.table-result {
    grid-column: span 2;
}

#sql-display {
    background-color: #272822;
    color: #f8f8f2;
    padding: 15px;
    border-radius: 3px;
    font-family: 'Consolas', monospace;
    white-space: pre-wrap;
    min-height: 100px;
}

#tree-display {
    min-height: 200px;
    border: 1px solid #ddd;
    border-radius: 3px;
    padding: 10px;
}

#result-table {
    width: 100%;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

table, th, td {
    border: 1px solid #ddd;
}

th {
    background-color: #f2f2f2;
    padding: 10px;
    text-align: left;
}

td {
    padding: 8px 10px;
}

/* 拖拽效果 */
.dragging {
    opacity: 0.5;
}

.drag-over {
    background-color: #e8f4f8;
    border: 2px dashed #3498db;
}

/* 删除按钮 */
.remove-btn {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 20px;
    height: 20px;
    background-color: #ff4d4d;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    cursor: pointer;
    display: none;
}

.query-item:hover .remove-btn {
    display: flex;
}

/* 响应式布局 */
@media (max-width: 768px) {
    .results-container {
        grid-template-columns: 1fr;
    }
    
    .table-result {
        grid-column: span 1;
    }
    
    .tables {
        flex-direction: column;
    }
}