:root {
    --primary-color: #4285f4;
    --secondary-color: #34a853;
    --danger-color: #ea4335;
    --warning-color: #fbbc05;
    --dark-color: #202124;
    --light-color: #f8f9fa;
    --gray-color: #5f6368;
    --light-gray: #e8eaed;
    --border-radius: 4px;
    --box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3), 0 2px 6px 2px rgba(60,64,67,0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f5f5;
    color: var(--dark-color);
    line-height: 1.6;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 100%;
    overflow: hidden;
}

header {
    background-color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--box-shadow);
    z-index: 10;
}

header h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.actions {
    display: flex;
    gap: 0.5rem;
}

.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

.btn.small {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

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

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

.btn.tertiary {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.schema-panel {
    width: 250px;
    background-color: white;
    border-right: 1px solid var(--light-gray);
    overflow-y: auto;
    padding: 1rem;
}

.query-builder {
    flex: 1;
    background-color: white;
    overflow-y: auto;
    padding: 1rem;
}

.results-panel {
    width: 350px;
    background-color: white;
    border-left: 1px solid var(--light-gray);
    overflow-y: auto;
    padding: 1rem;
}

.tables-list {
    margin-top: 1rem;
}

.table-card {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    padding: 0.75rem;
    margin-bottom: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border-left: 3px solid var(--primary-color);
}

.table-card:hover {
    background-color: #e8f0fe;
}

.table-card h4 {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.table-card h4 span {
    font-size: 0.875rem;
    color: var(--gray-color);
}

.columns-list {
    margin-top: 0.5rem;
    padding-left: 0.5rem;
}

.column-item {
    display: flex;
    align-items: center;
    padding: 0.25rem 0;
    font-size: 0.875rem;
    cursor: pointer;
}

.column-item:hover {
    color: var(--primary-color);
}

.column-item .column-type {
    font-size: 0.75rem;
    color: var(--gray-color);
    margin-left: 0.5rem;
}

.query-tabs {
    display: flex;
    border-bottom: 1px solid var(--light-gray);
    margin-bottom: 1rem;
}

.tab {
    padding: 0.5rem 1rem;
    background: none;
    border: none;
    cursor: pointer;
    font-weight: 500;
    color: var(--gray-color);
    border-bottom: 2px solid transparent;
}

.tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

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

.query-section {
    margin-bottom: 1.5rem;
}

.query-section h3 {
    margin-bottom: 0.75rem;
    font-size: 1rem;
    color: var(--gray-color);
}

.selected-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.selected-item {
    background-color: #e8f0fe;
    color: var(--primary-color);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.selected-item .remove-item {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    align-items: center;
}

.condition-group {
    background-color: var(--light-color);
    padding: 0.75rem;
    border-radius: var(--border-radius);
    margin-bottom: 0.75rem;
}

.condition-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    align-items: center;
}

.condition-row select, .condition-row input {
    padding: 0.375rem 0.5rem;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
}

.condition-row input {
    flex: 1;
}

.remove-condition, .remove-sort {
    background: none;
    border: none;
    color: var(--gray-color);
    cursor: pointer;
    display: flex;
    align-items: center;
}

.remove-condition:hover, .remove-sort:hover {
    color: var(--danger-color);
}

.sort-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    align-items: center;
}

.sort-row select {
    padding: 0.375rem 0.5rem;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
}

#sql-output {
    width: 100%;
    height: 300px;
    padding: 0.75rem;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.875rem;
    resize: none;
}

#results-container {
    margin-top: 1rem;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: var(--gray-color);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Responsive adjustments */
@media (max-width: 1200px) {
    .schema-panel {
        width: 200px;
    }
    .results-panel {
        width: 300px;
    }
}

@media (max-width: 992px) {
    .main-content {
        flex-direction: column;
    }
    .schema-panel, .results-panel {
        width: 100%;
        border-right: none;
        border-left: none;
        border-bottom: 1px solid var(--light-gray);
    }
    .query-builder {
        order: 1;
    }
}

/* Footer Styles */
.app-footer {
    background-color: var(--dark-color);
    color: white;
    padding: 2rem 1rem;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    gap: 2rem;
}

.footer-section {
    flex: 1;
    min-width: 200px;
}

.footer-section h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-section p, .footer-section li {
    color: #d1d1d1;
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #d1d1d1;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    margin-top: 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.8rem;
    color: #aaa;
}

/* Adjust main content to accommodate footer */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main-content {
    flex: 1;
}