/**
 * ESTILOS LIMPIOS PARA EL SISTEMA DRAG & DROP DE FÓRMULAS
 * Sistema único inline - sin duplicados ni problemas de scroll
 */

/* ===== CONTENEDOR PRINCIPAL ===== */
.drag-drop-formula-builder {
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    margin: 1rem 0;
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-light);
    color: var(--text-primary);
    transition: all 0.3s ease;
    height: auto;
    max-height: none;
    overflow: visible;
    display: flex;
    flex-direction: column;
}

.drag-drop-formula-builder:hover {
    box-shadow: var(--shadow-heavy);
    transform: translateY(-2px);
}

/* ===== HEADER ===== */
.builder-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, 
        rgba(var(--primary-rgb), 0.05) 0%, 
        rgba(var(--secondary-rgb), 0.05) 100%);
    border-radius: 8px;
    padding: 0.75rem 1rem;
}

.builder-header h5 {
    margin: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
}

.builder-controls {
    display: flex;
    gap: 0.5rem;
}

.builder-controls .btn {
    background: rgba(var(--primary-rgb), 0.1);
    border: 1px solid rgba(var(--primary-rgb), 0.3);
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.builder-controls .btn:hover {
    background: rgba(var(--primary-rgb), 0.2);
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

/* ===== LAYOUT PRINCIPAL ===== */
.builder-content {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 1.5rem;
    flex: 1;
}

/* ===== PALETA DE ELEMENTOS ===== */
.elements-palette {
    background: linear-gradient(135deg, 
        rgba(var(--primary-rgb), 0.08) 0%, 
        rgba(0, 0, 0, 0.1) 100%);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    backdrop-filter: blur(10px);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
}

.palette-tabs {
    display: flex;
    margin-bottom: 1rem;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    padding: 0.25rem;
    border: 1px solid var(--border-color);
}

.palette-tab {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem 0.25rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: 6px;
}

.palette-tab.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: 0 2px 8px rgba(var(--primary-rgb), 0.3);
}

.palette-tab:hover:not(.active) {
    color: var(--text-primary);
    background: rgba(var(--primary-rgb), 0.1);
}

/* ===== ELEMENTOS ARRASTRABLES ===== */
.draggable-element {
    display: inline-block;
    padding: 0.5rem 0.75rem;
    margin: 0.25rem;
    border-radius: 6px;
    cursor: grab;
    transition: all 0.3s ease;
    font-size: 0.85rem;
    font-weight: 500;
    user-select: none;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.draggable-element:active {
    cursor: grabbing;
    transform: scale(0.95);
}

.draggable-element.variable {
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.95) 0%, 
        rgba(245, 245, 245, 1) 100%);
    border: 2px solid rgba(100, 100, 100, 0.6);
    color: #000000 !important;
    font-weight: 600;
    text-shadow: none;
}

.draggable-element.operator {
    background: linear-gradient(135deg, 
        rgba(var(--warning-rgb), 0.15) 0%, 
        rgba(var(--warning-rgb), 0.25) 100%);
    border: 2px solid rgba(var(--warning-rgb), 0.4);
    color: var(--warning-color);
}

.draggable-element.function {
    background: linear-gradient(135deg, 
        rgba(var(--success-rgb), 0.15) 0%, 
        rgba(var(--success-rgb), 0.25) 100%);
    border: 2px solid rgba(var(--success-rgb), 0.4);
    color: var(--success-color);
}

.draggable-element:hover {
    transform: scale(1.05) translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.draggable-element.variable:hover {
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 1) 0%, 
        rgba(240, 240, 240, 1) 100%);
    border-color: rgba(0, 0, 0, 0.4);
}

.variables-grid, .operators-grid, .functions-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    justify-content: flex-start;
}

/* ===== ÁREA DE CONSTRUCCIÓN ===== */
.formula-builders {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    flex: 1;
}

.formula-builder-section {
    background: linear-gradient(135deg, 
        rgba(var(--primary-rgb), 0.03) 0%, 
        rgba(0, 0, 0, 0.05) 100%);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
}

.formula-builder-section:hover {
    border-color: rgba(var(--primary-rgb), 0.3);
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.1);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.section-header h6 {
    margin: 0;
    color: var(--text-primary);
    font-weight: 600;
    display: flex;
    align-items: center;
}

.section-header h6 i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

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

.section-actions .btn {
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
    border-radius: 6px;
    transition: all 0.2s ease;
}

/* ===== ZONAS DE DROP ===== */
.drop-zone {
    min-height: 80px;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    transition: all 0.4s ease;
    position: relative;
    background: linear-gradient(135deg, 
        rgba(var(--primary-rgb), 0.02) 0%, 
        transparent 100%);
}

.drop-zone.drag-over {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, 
        rgba(var(--primary-rgb), 0.1) 0%, 
        rgba(var(--secondary-rgb), 0.05) 100%);
    transform: scale(1.02);
    box-shadow: inset 0 0 20px rgba(var(--primary-rgb), 0.2);
}

.drop-placeholder {
    text-align: center;
    color: var(--text-secondary);
    pointer-events: none;
}

.drop-placeholder i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    opacity: 0.6;
    color: var(--primary-color);
}

.drop-placeholder p {
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.drop-placeholder small {
    font-size: 0.75rem;
    opacity: 0.8;
}

/* ===== ELEMENTOS EN LA FÓRMULA ===== */
.formula-elements {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    min-height: 40px;
    align-items: flex-start;
    align-content: flex-start;
}

.formula-element {
    display: inline-flex;
    align-items: center;
    padding: 0.4rem 0.7rem;
    border-radius: 6px;
    font-family: 'JetBrains Mono', 'Consolas', monospace;
    cursor: move;
    transition: all 0.3s ease;
    position: relative;
    font-weight: 500;
    font-size: 0.85rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.formula-element.variable {
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.95) 0%, 
        rgba(240, 240, 240, 1) 100%);
    border: 2px solid rgba(100, 100, 100, 0.6);
    color: #000000 !important;
    text-shadow: none;
    font-weight: 600;
}

.formula-element.operator {
    background: linear-gradient(135deg, 
        rgba(var(--warning-rgb), 0.2) 0%, 
        rgba(var(--warning-rgb), 0.35) 100%);
    border: 2px solid rgba(var(--warning-rgb), 0.6);
    color: white;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.formula-element.function {
    background: linear-gradient(135deg, 
        rgba(var(--success-rgb), 0.2) 0%, 
        rgba(var(--success-rgb), 0.35) 100%);
    border: 2px solid rgba(var(--success-rgb), 0.6);
    color: white;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.formula-element:hover {
    transform: scale(1.05) translateY(-2px);
    z-index: 10;
}

.formula-element.variable:hover {
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 1) 0%, 
        rgba(235, 235, 235, 1) 100%);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* ===== VISTA PREVIA Y RESULTADOS ===== */
.formula-preview {
    margin-top: 1rem;
    padding: 0.75rem;
    background: linear-gradient(135deg, 
        rgba(0, 0, 0, 0.15) 0%, 
        rgba(var(--primary-rgb), 0.05) 100%);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: 'JetBrains Mono', 'Consolas', monospace;
    backdrop-filter: blur(5px);
}

.formula-preview strong {
    color: var(--text-primary);
    font-weight: 600;
}

.formula-preview code {
    color: var(--primary-color);
    background: none;
    font-size: 0.9rem;
    font-weight: 500;
}

.formula-result {
    margin-top: 0.75rem;
    padding: 0.75rem;
    background: linear-gradient(135deg, 
        rgba(var(--success-rgb), 0.1) 0%, 
        rgba(var(--success-rgb), 0.05) 100%);
    border: 2px solid rgba(var(--success-rgb), 0.3);
    border-radius: 8px;
    backdrop-filter: blur(5px);
}

.result-value {
    font-weight: 700;
    color: var(--success-color);
    font-size: 1rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* ===== FOOTER ===== */
.builder-footer {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    background: linear-gradient(135deg, 
        rgba(var(--primary-rgb), 0.02) 0%, 
        rgba(var(--secondary-rgb), 0.02) 100%);
    border-radius: 8px;
    padding: 1rem;
}

.test-values h6 {
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 600;
}

.action-buttons {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
    align-items: center;
    flex-wrap: wrap;
}

.action-buttons .btn {
    padding: 0.5rem 1rem;
    font-weight: 600;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.action-buttons .btn-success {
    background: linear-gradient(135deg, var(--success-color), rgba(var(--success-rgb), 0.8));
    border: none;
    box-shadow: 0 3px 8px rgba(var(--success-rgb), 0.3);
}

.action-buttons .btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(var(--success-rgb), 0.4);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 992px) {
    .builder-content {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .elements-palette {
        order: 2;
        margin-top: 1rem;
    }
    
    .formula-builders {
        order: 1;
    }
}

@media (max-width: 768px) {
    .drag-drop-formula-builder {
        padding: 0.75rem;
        margin: 0.5rem 0;
    }
    
    .builder-header {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
    }
    
    .palette-tabs {
        flex-direction: column;
    }
    
    .action-buttons {
        justify-content: center;
        flex-direction: column;
    }
    
    .action-buttons .btn {
        width: 100%;
    }
}