:root {
    /* Primary Colors */
    --sql-primary: #2563eb;
    --sql-primary-dark: #1d4ed8;
    --sql-primary-light: #dbeafe;
    --sql-primary-hover: #1d4ed8;
    --sql-primary-shadow: rgb(37 99 235 / 25%);
    
    /* Semantic Colors */
    --sql-success: #10b981;
    --sql-warning: #f59e0b;
    --sql-danger: #ef4444;
    --sql-info: #3b82f6;
    --sql-accent: #36cfc9;
    
    /* Surface Colors */
    --sql-surface: #ffffff;
    --sql-surface-muted: #f4f6fb;
    --sql-surface-elevated: #ffffff;
    --sql-background: #f8fafc;
    --sql-secondary-bg: #e2e8f0;
    
    /* Border Colors */
    --sql-border: #e2e8f0;
    --sql-border-light: #f1f5f9;
    --sql-border-dark: #cbd5e1;
    
    /* Text Colors */
    --sql-text-main: #0f172a;
    --sql-text-muted: #64748b;
    --sql-text-light: #94a3b8;
    --sql-text-inverse: #ffffff;
    
    /* Shadow System */
    --sql-shadow-soft: 0 20px 45px rgba(15, 23, 42, 0.08);
    --sql-shadow-sm: 0 1px 2px rgb(15 23 42 / 0.08);
    --sql-shadow-md: 0 4px 12px rgb(15 23 42 / 0.08);
    --sql-shadow-lg: 0 12px 24px rgb(15 23 42 / 0.12);
    --sql-shadow-xl: 0 20px 25px rgb(15 23 42 / 0.1);
    
    /* Border Radius */
    --sql-radius-sm: 0.5rem;
    --sql-radius-md: 0.875rem;
    --sql-radius-lg: 1.25rem;
    --sql-radius-xl: 1.75rem;
    --sql-radius-full: 9999px;
    
    /* Spacing */
    --sql-spacing-xs: 0.25rem;
    --sql-spacing-sm: 0.5rem;
    --sql-spacing-md: 1rem;
    --sql-spacing-lg: 1.5rem;
    --sql-spacing-xl: 2rem;
    --sql-spacing-2xl: 3rem;
}

/* Table Generator Section */
.table-generator-section {
    margin-bottom: var(--sql-spacing-2xl);
}

.table-generator-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--sql-spacing-xl);
}

/* Card Styles */
.table-config-card,
.sql-output-card {
    background: var(--sql-surface);
    border-radius: var(--sql-radius-lg);
    box-shadow: var(--sql-shadow-md);
    overflow: hidden;
    border: 1px solid var(--sql-border);
}

.card-header {
    padding: var(--sql-spacing-lg);
    border-bottom: 1px solid var(--sql-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--sql-spacing-md);
    background: var(--sql-surface-muted);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--sql-text-main);
    margin: 0;
}

.card-actions {
    display: flex;
    gap: var(--sql-spacing-sm);
    flex-wrap: wrap;
}

.card-body {
    padding: var(--sql-spacing-lg);
}

/* Form Elements */
.form-group {
    margin-bottom: var(--sql-spacing-lg);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--sql-text-main);
    margin-bottom: var(--sql-spacing-sm);
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--sql-border);
    border-radius: var(--sql-radius-md);
    background: var(--sql-surface);
    color: var(--sql-text-main);
    transition: all 0.2s ease;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--sql-primary);
    box-shadow: 0 0 0 3px var(--sql-primary-shadow);
}

.form-input::placeholder {
    color: var(--sql-text-light);
}

/* Columns Section */
.columns-section {
    margin-top: var(--sql-spacing-xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--sql-spacing-lg);
    flex-wrap: wrap;
    gap: var(--sql-spacing-md);
}

.section-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--sql-text-main);
    margin: 0;
}

.columns-container {
    display: flex;
    flex-direction: column;
    gap: var(--sql-spacing-md);
}

/* Column Card */
.column-card {
    background: var(--sql-surface-muted);
    border: 1px solid var(--sql-border);
    border-radius: var(--sql-radius-md);
    padding: var(--sql-spacing-lg);
    transition: all 0.2s ease;
}

.column-card:hover {
    border-color: var(--sql-border-dark);
    box-shadow: var(--sql-shadow-sm);
}

.column-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--sql-spacing-md);
}

.column-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--sql-primary);
    color: var(--sql-text-inverse);
    border-radius: var(--sql-radius-full);
    font-size: 0.875rem;
    font-weight: 600;
}

.btn-remove-column {
    background: transparent;
    border: none;
    color: var(--sql-text-muted);
    cursor: pointer;
    padding: var(--sql-spacing-xs);
    border-radius: var(--sql-radius-sm);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-remove-column:hover {
    background: var(--sql-danger);
    color: var(--sql-text-inverse);
}

.column-fields {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--sql-spacing-md);
}

.field-group {
    display: flex;
    flex-direction: column;
}

.field-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--sql-text-main);
    margin-bottom: var(--sql-spacing-xs);
}

.field-group-length {
    grid-column: span 1;
}

.field-group-options {
    grid-column: span 1;
}

/* Checkbox Group */
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--sql-spacing-sm);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--sql-spacing-sm);
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--sql-text-main);
}

.checkbox-input {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--sql-primary);
}

.checkbox-text {
    user-select: none;
}

/* Buttons */
.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--sql-spacing-xs);
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--sql-radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-primary {
    background: var(--sql-primary);
    color: var(--sql-text-inverse);
}

.btn-primary:hover {
    background: var(--sql-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--sql-shadow-md);
}

.btn-secondary {
    background: var(--sql-surface);
    color: var(--sql-text-main);
    border: 1px solid var(--sql-border);
}

.btn-secondary:hover {
    background: var(--sql-surface-muted);
    border-color: var(--sql-border-dark);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
}

.btn-icon {
    font-size: 1rem;
    line-height: 1;
}

/* Editor Wrapper */
.editor-wrapper {
    border: 1px solid var(--sql-border);
    border-radius: var(--sql-radius-md);
    overflow: hidden;
    background: var(--sql-surface);
}

.editor {
    min-height: 400px;
    width: 100%;
}

#output-editor {
    min-height: 400px;
}

/* Content Section */
.content-section {
    margin-top: var(--sql-spacing-2xl);
    margin-bottom: var(--sql-spacing-2xl);
}

.content-block {
    background: var(--sql-surface);
    padding: var(--sql-spacing-xl);
    border-radius: var(--sql-radius-lg);
    box-shadow: var(--sql-shadow-sm);
}

.content-block h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--sql-text-main);
    margin-top: 0;
    margin-bottom: var(--sql-spacing-lg);
}

.content-block h3 {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--sql-text-main);
    margin-top: var(--sql-spacing-xl);
    margin-bottom: var(--sql-spacing-md);
}

.content-block p {
    color: var(--sql-text-muted);
    line-height: 1.7;
    margin-bottom: var(--sql-spacing-md);
}

.content-block ul,
.content-block ol {
    color: var(--sql-text-muted);
    line-height: 1.7;
    margin-bottom: var(--sql-spacing-md);
    padding-left: var(--sql-spacing-xl);
}

.content-block li {
    margin-bottom: var(--sql-spacing-sm);
}

.content-block strong {
    color: var(--sql-text-main);
    font-weight: 600;
}

/* Mobile Responsive */
@media (max-width: 767px) {
    .table-generator-wrapper {
        gap: var(--sql-spacing-lg);
    }
    
    .card-header {
        padding: var(--sql-spacing-md);
    }
    
    .card-body {
        padding: var(--sql-spacing-md);
    }
    
    .column-fields {
        grid-template-columns: 1fr;
    }
    
    .field-group-length,
    .field-group-options {
        grid-column: span 1;
    }
    
    .editor,
    #output-editor {
        min-height: 300px;
    }
    
    .content-block {
        padding: var(--sql-spacing-lg);
    }
}

/* Tablet and Desktop */
@media (min-width: 768px) {
    .table-generator-wrapper {
        grid-template-columns: 1fr 1fr;
    }
    
    .column-fields {
        grid-template-columns: 1fr 1fr;
    }
    
    .field-group-length {
        grid-column: span 1;
    }
    
    .field-group-options {
        grid-column: span 2;
    }
}

@media (min-width: 1024px) {
    .column-fields {
        grid-template-columns: 1.5fr 1fr 0.8fr 1.2fr;
    }
    
    .field-group-length,
    .field-group-options {
        grid-column: span 1;
    }
}

/* Ace Editor Customization */
.ace_editor {
    
    font-size: 14px;
    line-height: 1.6;
}

.ace_editor .ace_gutter {
    background: var(--sql-surface-muted);
    border-right: 1px solid var(--sql-border);
}

.ace_editor .ace_gutter-active-line {
    background: var(--sql-primary-light);
}

/* Accessibility */
.btn-primary:focus,
.btn-secondary:focus,
.form-input:focus,
.form-select:focus {
    outline: 2px solid var(--sql-primary);
    outline-offset: 2px;
}

/* Loading States */
.btn-primary:disabled,
.btn-secondary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Notification Styles */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem 1.5rem;
    background: var(--sql-surface);
    border: 1px solid var(--sql-border);
    border-radius: var(--sql-radius-md);
    box-shadow: var(--sql-shadow-lg);
    z-index: 10000;
    font-size: 0.875rem;
    color: var(--sql-text-main);
    max-width: 300px;
}

.notification-success {
    border-color: var(--sql-success);
    background: #f0fdf4;
    color: #166534;
}

.notification-warning {
    border-color: var(--sql-warning);
    background: #fffbeb;
    color: #92400e;
}

.notification-error {
    border-color: var(--sql-danger);
    background: #fef2f2;
    color: #991b1b;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}