:root {
    --primary-color: var(--color-primario, #667eea);
    --secondary-color: var(--color-secundario, #764ba2);
    --panel-bg: var(--color-fondo, #ffffff);
    --border-radius: var(--radio-borde, 8px);
    --transition-speed: 0.3s;
    --overlay-bg: rgba(0, 0, 0, 0.5);
    --modal-z-index: 1000;
    --model-viewer-z: 1;
    --canvas-overlay-z: 2;
}

.km-btn-personalizar:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.km-btn-personalizar:active {
    transform: translateY(0);
}

/* Modal Base - Full screen mobile */
.modal-personalizacion {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--modal-z-index);
    display: flex;
    align-items: flex-end;
    /* Mobile: abajo arriba */
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--overlay-bg);
    backdrop-filter: blur(4px);
}

/* Contenedor del Modal */
.modal-contenedor {
    position: relative;
    background: var(--panel-bg);
    width: 100%;
    height: 95%;
    /* Mobile: casi full screen */
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: slideUp var(--transition-speed) ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Header del Modal */
.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid #e0e0e0;
    background: #f8f9fa;
}

.modal-titulo {
    font-size: 1.25rem;
    font-weight: 600;
    color: #333;
    margin: 0;
    display: flex;
    align-items: center;
}

.modal-cerrar {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #666;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background var(--transition-speed);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-cerrar:hover {
    background: #e0e0e0;
    color: #333;
}

/* Body del Modal - Layout Vertical en Mobile */
.modal-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Panel Izquierdo - Canvas Overlay */
.modal-panel-izquierda {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 16px;
    overflow: hidden;
}

/* Contenedor de Canvas Overlay - Core Architecture */
.canvas-overlay-container {
    position: relative;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: var(--border-radius);
    overflow: hidden;
    min-height: 300px;
}

/* Model Viewer - Background Layer */
.model-viewer-personalizacion {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--model-viewer-z);
    --poster-color: transparent;
}

/* Canvas Fabric.js - Overlay Layer (Captures Events) */
.canvas-fabric-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: var(--canvas-overlay-z);
    background-color: rgba(0, 0, 0, 0);
    cursor: crosshair;
    /* Área de impresión: proporción dinámica basada en data-attributes */
    width: var(--canvas-width, 300px);
    height: var(--canvas-height, 225px);
}

/* Indicador de Área de Impresión */
.area-impresion-indicator {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.95);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.75rem;
    color: #666;
    z-index: calc(var(--canvas-overlay-z) + 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.area-label {
    font-weight: 600;
    color: #333;
}

.area-dimensiones {
    font-size: 0.7rem;
    color: #888;
}

/* Selector de Vista */
.vista-selector {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    justify-content: center;
}

.btn-vista {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    border: 2px solid #e0e0e0;
    background: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: #666;
    transition: all var(--transition-speed);
}

.btn-vista:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

/* Panel Derecho - Controles (Scrollable en mobile) */
.modal-panel-derecha {
    padding: 16px 20px;
    background: #f8f9fa;
    border-top: 1px solid #e0e0e0;
    max-height: 40vh;
    overflow-y: auto;
}

.controles-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.control-grupo {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: #333;
    display: flex;
    align-items: center;
}

/* Selector de Colores */
.color-selector {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.btn-color {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 3px solid transparent;
    cursor: pointer;
    position: relative;
    transition: transform var(--transition-speed);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-color:hover {
    transform: scale(1.1);
    border-color: #ddd;
}

.btn-color.active {
    border-color: #333;
    transform: scale(1.15);
}

.color-check {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 14px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: opacity var(--transition-speed);
}

.btn-color.active .color-check {
    opacity: 1;
}

.color-nombre-actual {
    font-size: 0.8rem;
    color: #888;
}

/* Input de Logo */
.logo-input-container {
    position: relative;
}

.logo-input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.logo-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
    border: 2px dashed #ccc;
    border-radius: var(--border-radius);
    background: white;
    cursor: pointer;
    transition: all var(--transition-speed);
    text-align: center;
}

.logo-label:hover {
    border-color: var(--primary-color);
    background: #f0f7ff;
}

.logo-text {
    font-size: 0.875rem;
    color: #333;
    font-weight: 500;
}

.logo-hint {
    font-size: 0.75rem;
    color: #888;
    margin-top: 4px;
}

.logo-preview-container {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 12px;
    padding: 12px;
    background: white;
    border-radius: var(--border-radius);
    border: 1px solid #e0e0e0;
}

.logo-preview {
    max-width: 80px;
    max-height: 80px;
    object-fit: contain;
    border-radius: 4px;
}

.btn-eliminar-logo {
    background: #ff4444;
    color: white;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-speed);
}

.btn-eliminar-logo:hover {
    background: #cc0000;
}

/* Instrucciones */
.instrucciones-grupo {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 12px;
    background: white;
    border-radius: var(--border-radius);
    border: 1px solid #e0e0e0;
}

.instruccion-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.8rem;
    color: #666;
}

.instruccion-item i {
    color: var(--primary-color);
    font-size: 1rem;
    width: 20px;
    text-align: center;
}

/* Botón Previsualizar */
.btn-previsualizar-render {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-previsualizar-render:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.btn-previsualizar-render:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: #ccc;
    box-shadow: none;
}

.btn-texto-cargando {
    display: none;
}

.btn-previsualizar-render.loading .btn-texto-normal {
    display: none;
}

.btn-previsualizar-render.loading .btn-texto-cargando {
    display: flex;
}

/* Resultado del Render */
.resultado-render-container {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.resultado-render-wrapper {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.resultado-render-img {
    width: 100%;
    height: auto;
    display: block;
}

.btn-descargar-render {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.95);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    transition: all var(--transition-speed);
}

.btn-descargar-render:hover {
    background: white;
    transform: scale(1.1);
}

.btn-aplicar-personalizacion {
    width: 100%;
    padding: 14px;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 12px;
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

.btn-aplicar-personalizacion:hover {
    background: #45a049;
    transform: translateY(-2px);
}

/* ============================================
RESPONSIVE - TABLET Y DESKTOP
============================================ */
@media (min-width: 768px) {
    .modal-personalizacion {
        align-items: center;
        padding: 20px;
    }

    .modal-contenedor {
        width: 90%;
        height: 85%;
        max-width: 1200px;
        border-radius: var(--border-radius);
        animation: fadeIn var(--transition-speed) ease-out;
    }

    @keyframes fadeIn {
        from {
            transform: scale(0.95);
            opacity: 0;
        }

        to {
            transform: scale(1);
            opacity: 1;
        }
    }

    .modal-body {
        flex-direction: row;
    }

    .modal-panel-izquierda {
        flex: 1.2;
        padding: 24px;
    }

    .modal-panel-derecha {
        flex: 0.8;
        max-height: none;
        border-top: none;
        border-left: 1px solid #e0e0e0;
        padding: 24px;
        overflow-y: auto;
    }

    .canvas-overlay-container {
        min-height: 400px;
    }

    .canvas-fabric-overlay {
        /* Desktop: área de impresión más grande */
        width: var(--canvas-width, 400px);
        height: var(--canvas-height, 300px);
    }
}

@media (min-width: 1024px) {
    .modal-panel-izquierda {
        flex: 1.5;
    }

    .modal-panel-derecha {
        flex: 1;
    }

    .canvas-fabric-overlay {
        width: var(--canvas-width, 450px);
        height: var(--canvas-height, 337px);
    }
}

/* ============================================
UTILIDADES Y HELPERS
============================================ */
.personalizacion-section {
    margin-bottom: 1rem;
}

/* Ocultar scrollbar en webkit */
.modal-panel-derecha::-webkit-scrollbar {
    width: 6px;
}

.modal-panel-derecha::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.modal-panel-derecha::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 3px;
}

.modal-panel-derecha::-webkit-scrollbar-thumb:hover {
    background: #999;
}

/* Mejoras de accesibilidad */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible para navegación por teclado */
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}