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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f5f7fa;
    color: #2c3e50;
    padding: 16px;
}

#app {
    max-width: 1200px;
    margin: 0 auto;
}

h1 {
    font-size: 1.5rem;
    color: rgb(30, 75, 105);
    margin-bottom: 2px;
}

.subtitle {
    font-size: 0.9rem;
    color: #7f8c8d;
    margin-bottom: 16px;
}

h2 {
    font-size: 1.1rem;
    color: rgb(30, 75, 105);
    margin-bottom: 10px;
    border-bottom: 2px solid rgb(70, 180, 200);
    padding-bottom: 4px;
}

h3 {
    font-size: 0.95rem;
    color: #34495e;
    margin-bottom: 6px;
}

.main-layout {
    display: flex;
    gap: 16px;
}

/* --- Left Panel: Tables --- */
.tables-panel {
    flex: 0 0 420px;
    background: #fff;
    border-radius: 8px;
    padding: 14px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
    max-height: 880px;
    overflow-y: auto;
}

.db-table {
    margin-bottom: 14px;
}

.db-table-name {
    font-weight: 700;
    font-size: 0.85rem;
    color: #27ae60;
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.db-table-name .pk-badge {
    font-size: 0.65rem;
    background: #eee;
    color: #888;
    padding: 1px 5px;
    border-radius: 3px;
    font-weight: 400;
}

table.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.78rem;
}

table.data-table th {
    background: rgb(30, 75, 105);
    color: #fff;
    padding: 4px 8px;
    text-align: left;
    font-weight: 600;
    font-size: 0.75rem;
}

table.data-table td {
    padding: 3px 8px;
    border-bottom: 1px solid #eee;
}

table.data-table tr.highlight {
    background: rgba(70, 180, 200, 0.2);
    font-weight: 600;
}

table.data-table tr:hover {
    background: #f9f9f9;
}

#er-canvas-container {
    margin-top: 12px;
}

#er-canvas canvas {
    border-radius: 6px;
}

/* --- Right Panel: Query Builder --- */
.query-panel {
    flex: 1;
    background: #fff;
    border-radius: 8px;
    padding: 14px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.builder-row {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 10px;
}

.builder-row label {
    min-width: 70px;
    font-weight: 700;
    font-size: 0.82rem;
    color: #2980b9;
    padding-top: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

select, input[type="text"] {
    padding: 5px 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 0.82rem;
    background: #fff;
}

select:focus, input[type="text"]:focus {
    border-color: rgb(70, 180, 200);
    outline: none;
    box-shadow: 0 0 0 2px rgba(70, 180, 200, 0.2);
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 12px;
    padding-top: 4px;
}

.checkbox-group label {
    font-weight: 400;
    font-size: 0.8rem;
    min-width: auto;
    color: #2c3e50;
    padding-top: 0;
    text-transform: none;
    letter-spacing: 0;
    cursor: pointer;
}

.checkbox-group .hint {
    color: #aaa;
    font-style: italic;
    font-size: 0.8rem;
}

.where-group {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.where-group select {
    max-width: 140px;
}

.where-group input {
    width: 120px;
}

/* SQL Preview */
.sql-preview {
    background: #1e1e2e;
    border-radius: 6px;
    padding: 10px 14px;
    margin: 12px 0;
}

.sql-preview h3 {
    color: #cdd6f4;
    margin-bottom: 6px;
    font-size: 0.8rem;
}

.sql-preview pre {
    font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    color: #cdd6f4;
    white-space: pre-wrap;
    word-break: break-word;
}

.sql-hint {
    color: #6c7086;
    font-style: italic;
}

/* SQL syntax colors */
.kw { color: #89b4fa; font-weight: 700; }   /* keywords: blue */
.tbl { color: #a6e3a1; }                      /* tables: green */
.val { color: #fab387; }                       /* values: orange */
.col { color: #cdd6f4; }                       /* columns: light */
.op { color: #f38ba8; }                        /* operators: pink */
.star { color: #f9e2af; font-weight: 700; }    /* asterisk: yellow */

/* Buttons */
.button-row {
    display: flex;
    gap: 10px;
    margin-bottom: 14px;
}

.btn-run {
    background: rgb(30, 75, 105);
    color: #fff;
    border: none;
    padding: 8px 24px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-run:hover:not(:disabled) {
    background: rgb(70, 180, 200);
}

.btn-run:disabled {
    background: #bbb;
    cursor: not-allowed;
}

.btn-clear {
    background: #ecf0f1;
    color: #7f8c8d;
    border: 1px solid #ddd;
    padding: 8px 18px;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-clear:hover {
    background: #dfe6e9;
}

/* Examples */
.examples-section {
    margin-bottom: 14px;
}

.example-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.example-btn {
    background: #eef6ff;
    border: 1px solid #b8d4f0;
    color: rgb(30, 75, 105);
    padding: 5px 12px;
    border-radius: 16px;
    font-size: 0.78rem;
    cursor: pointer;
    transition: all 0.2s;
}

.example-btn:hover {
    background: rgb(70, 180, 200);
    color: #fff;
    border-color: rgb(70, 180, 200);
}

/* Results */
.results-section {
    border-top: 2px solid rgb(70, 180, 200);
    padding-top: 10px;
}

.results-section h3 {
    margin-bottom: 8px;
}

#row-count {
    font-weight: 400;
    font-size: 0.8rem;
    color: #7f8c8d;
}

table.result-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
}

table.result-table th {
    background: rgb(70, 180, 200);
    color: #fff;
    padding: 5px 10px;
    text-align: left;
    font-weight: 600;
}

table.result-table td {
    padding: 4px 10px;
    border-bottom: 1px solid #eee;
}

table.result-table tr:nth-child(even) {
    background: #f8fafc;
}

/* Error */
.error-section {
    background: #fdf0ed;
    border: 1px solid #e74c3c;
    border-radius: 6px;
    padding: 10px 14px;
    color: #c0392b;
    font-size: 0.85rem;
    margin-top: 10px;
}

/* Responsive */
@media (max-width: 900px) {
    .main-layout {
        flex-direction: column;
    }
    .tables-panel {
        flex: none;
        max-height: none;
    }
}