/**
 * Document Upload Calculator - Estilos del Frontend
 *
 * Estilos responsivos para el formulario de subida de documentos,
 * zona de drag & drop, lista de archivos y resumen de costes.
 *
 * @since 1.0.0
 * @package Document_Upload_Calculator
 */

/* ============================================
   Variables CSS
   ============================================ */
:root {
    --duc-primary: #4a90d9;
    --duc-primary-hover: #357abd;
    --duc-primary-light: #e8f0fe;
    --duc-success: #4caf50;
    --duc-success-light: #e8f5e9;
    --duc-danger: #e53935;
    --duc-danger-light: #ffebee;
    --duc-warning: #ff9800;
    --duc-warning-light: #fff3e0;
    --duc-text: #333333;
    --duc-text-light: #666666;
    --duc-text-muted: #999999;
    --duc-border: #e0e0e0;
    --duc-bg: #ffffff;
    --duc-bg-light: #f8f9fa;
    --duc-radius: 12px;
    --duc-radius-sm: 8px;
    --duc-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    --duc-shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --duc-transition: all 0.3s ease;
}

/* ============================================
   Contenedor principal
   ============================================ */
.duc-formulario {
    max-width: 680px;
    margin: 0 auto;
    padding: 30px;
    background: var(--duc-bg);
    border-radius: var(--duc-radius);
    box-shadow: var(--duc-shadow);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--duc-text);
    line-height: 1.5;
    box-sizing: border-box;
}

.duc-formulario *,
.duc-formulario *::before,
.duc-formulario *::after {
    box-sizing: border-box;
}

/* ============================================
   Encabezado
   ============================================ */
.duc-header {
    text-align: center;
    margin-bottom: 25px;
}

.duc-titulo {
    font-size: 24px;
    font-weight: 700;
    color: var(--duc-primary);
    margin: 0 0 8px;
}

.duc-subtitulo {
    font-size: 15px;
    color: var(--duc-text-light);
    margin: 0;
}

/* ============================================
   Zona de arrastrar y soltar
   ============================================ */
.duc-zona-drop {
    border: 2px dashed var(--duc-border);
    border-radius: var(--duc-radius-sm);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--duc-transition);
    position: relative;
    background: var(--duc-bg-light);
    outline: none;
}

.duc-zona-drop:hover,
.duc-zona-drop:focus {
    border-color: var(--duc-primary);
    background: var(--duc-primary-light);
}

.duc-zona-drop.duc-drop-activo {
    border-color: var(--duc-primary);
    background: var(--duc-primary-light);
    border-style: solid;
    transform: scale(1.02);
}

.duc-zona-drop.duc-subiendo {
    pointer-events: none;
    opacity: 0.7;
}

.duc-drop-icono {
    color: var(--duc-text-muted);
    margin-bottom: 10px;
    transition: var(--duc-transition);
}

.duc-zona-drop:hover .duc-drop-icono,
.duc-zona-drop.duc-drop-activo .duc-drop-icono {
    color: var(--duc-primary);
    transform: translateY(-3px);
}

.duc-drop-texto-principal {
    font-size: 16px;
    font-weight: 600;
    color: var(--duc-text);
    margin: 0 0 5px;
}

.duc-drop-texto-secundario {
    font-size: 14px;
    color: var(--duc-text-muted);
    margin: 0 0 12px;
}

.duc-drop-formatos {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 6px;
    margin: 0;
}

.duc-formato-badge {
    display: inline-block;
    padding: 3px 10px;
    background: var(--duc-bg);
    border: 1px solid var(--duc-border);
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    color: var(--duc-text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.duc-input-oculto {
    position: absolute;
    width: 0;
    height: 0;
    opacity: 0;
    overflow: hidden;
}

/* ============================================
   Lista de archivos
   ============================================ */
.duc-archivos-lista {
    margin-top: 20px;
}

.duc-archivos-titulo {
    font-size: 15px;
    font-weight: 600;
    color: var(--duc-text);
    margin: 0 0 12px;
    display: flex;
    align-items: center;
}

.duc-archivos-contador {
    font-weight: 400;
    color: var(--duc-text-muted);
    font-size: 13px;
    margin-left: 6px;
}

.duc-archivo-item {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    background: var(--duc-bg-light);
    border: 1px solid var(--duc-border);
    border-radius: var(--duc-radius-sm);
    margin-bottom: 8px;
    transition: var(--duc-transition);
    animation: ducSlideIn 0.3s ease;
}

@keyframes ducSlideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.duc-archivo-item:hover {
    border-color: var(--duc-primary);
    box-shadow: 0 2px 8px rgba(74, 144, 217, 0.1);
}

.duc-archivo-icono {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
    color: white;
    text-transform: uppercase;
    margin-right: 12px;
}

.duc-archivo-icono.duc-ext-pdf { background: #e53935; }
.duc-archivo-icono.duc-ext-doc,
.duc-archivo-icono.duc-ext-docx { background: #1565c0; }
.duc-archivo-icono.duc-ext-xls,
.duc-archivo-icono.duc-ext-xlsx { background: #2e7d32; }
.duc-archivo-icono.duc-ext-jpg,
.duc-archivo-icono.duc-ext-jpeg { background: #ff9800; }

.duc-archivo-info {
    flex: 1;
    min-width: 0;
}

.duc-archivo-nombre {
    font-size: 14px;
    font-weight: 500;
    color: var(--duc-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.duc-archivo-meta {
    font-size: 12px;
    color: var(--duc-text-muted);
    margin-top: 2px;
}

.duc-archivo-paginas {
    flex-shrink: 0;
    text-align: right;
    margin: 0 15px;
}

.duc-archivo-paginas-num {
    font-size: 18px;
    font-weight: 700;
    color: var(--duc-primary);
    display: block;
}

.duc-archivo-paginas-texto {
    font-size: 11px;
    color: var(--duc-text-muted);
    text-transform: uppercase;
}

.duc-archivo-eliminar {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--duc-text-muted);
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--duc-transition);
    padding: 0;
}

.duc-archivo-eliminar:hover {
    background: var(--duc-danger-light);
    color: var(--duc-danger);
}

/* Barra de progreso de subida */
.duc-archivo-progreso {
    width: 100%;
    height: 3px;
    background: var(--duc-border);
    border-radius: 3px;
    margin-top: 6px;
    overflow: hidden;
}

.duc-archivo-progreso-barra {
    height: 100%;
    background: var(--duc-primary);
    border-radius: 3px;
    transition: width 0.3s ease;
    width: 0%;
}

.duc-archivo-procesando {
    opacity: 0.6;
}

.duc-archivo-error {
    border-color: var(--duc-danger);
    background: var(--duc-danger-light);
}

.duc-archivo-error .duc-archivo-nombre {
    color: var(--duc-danger);
}

/* ============================================
   Resumen de costes
   ============================================ */
.duc-resumen {
    margin-top: 20px;
    padding: 20px;
    background: var(--duc-bg-light);
    border-radius: var(--duc-radius-sm);
    border: 1px solid var(--duc-border);
}

.duc-resumen-fila {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    font-size: 14px;
    color: var(--duc-text-light);
}

.duc-resumen-total {
    margin-top: 10px;
    padding-top: 12px;
    border-top: 2px solid var(--duc-border);
}

.duc-resumen-total .duc-resumen-etiqueta {
    font-size: 16px;
    font-weight: 600;
    color: var(--duc-text);
}

.duc-coste-total {
    font-size: 24px;
    font-weight: 700;
    color: var(--duc-success);
}

/* ============================================
   Opciones de impresión
   ============================================ */
.duc-opciones-impresion {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--duc-border);
}

.duc-opciones-titulo {
    font-size: 15px;
    font-weight: 600;
    color: var(--duc-text);
    margin: 0 0 15px;
    display: flex;
    align-items: center;
}

.duc-opciones-grupo {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.duc-opcion-bloque {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.duc-opcion-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--duc-text);
}

.duc-radio-grupo {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.duc-radio-tarjeta {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    border: 2px solid var(--duc-border);
    border-radius: var(--duc-radius-sm);
    cursor: pointer;
    transition: var(--duc-transition);
    background: var(--duc-bg);
    position: relative;
}

.duc-radio-tarjeta:hover {
    border-color: var(--duc-primary);
    background: var(--duc-primary-light);
}

.duc-radio-tarjeta.duc-radio-activo {
    border-color: var(--duc-primary);
    background: var(--duc-primary-light);
    box-shadow: 0 0 0 1px var(--duc-primary);
}

.duc-radio-tarjeta input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.duc-radio-icono {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--duc-bg-light);
    color: var(--duc-text-muted);
    transition: var(--duc-transition);
}

.duc-radio-tarjeta.duc-radio-activo .duc-radio-icono {
    background: var(--duc-primary);
    color: white;
}

.duc-radio-texto {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.duc-radio-texto strong {
    font-size: 14px;
    font-weight: 600;
    color: var(--duc-text);
}

.duc-radio-texto small {
    font-size: 12px;
    color: var(--duc-text-muted);
}

.duc-radio-tarjeta.duc-radio-activo .duc-radio-texto strong {
    color: var(--duc-primary);
}

/* ============================================
   Campos del formulario
   ============================================ */
.duc-datos-usuario {
    margin-top: 25px;
    padding-top: 25px;
    border-top: 1px solid var(--duc-border);
}

.duc-datos-titulo {
    font-size: 16px;
    font-weight: 600;
    color: var(--duc-text);
    margin: 0 0 15px;
}

.duc-campo-grupo {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.duc-campo {
    margin-bottom: 15px;
}

.duc-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--duc-text);
    margin-bottom: 5px;
}

.duc-requerido {
    color: var(--duc-danger);
}

.duc-input,
.duc-textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--duc-border);
    border-radius: 6px;
    font-size: 14px;
    color: var(--duc-text);
    background: var(--duc-bg);
    transition: var(--duc-transition);
    font-family: inherit;
}

.duc-input:focus,
.duc-textarea:focus {
    outline: none;
    border-color: var(--duc-primary);
    box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.15);
}

.duc-input::placeholder,
.duc-textarea::placeholder {
    color: var(--duc-text-muted);
}

.duc-textarea {
    resize: vertical;
    min-height: 80px;
}

.duc-input.duc-campo-error,
.duc-textarea.duc-campo-error {
    border-color: var(--duc-danger);
    box-shadow: 0 0 0 3px rgba(229, 57, 53, 0.1);
}

/* ============================================
   Botones
   ============================================ */
.duc-acciones {
    margin-top: 25px;
    text-align: center;
}

.duc-btn-enviar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 40px;
    background: var(--duc-primary);
    color: white;
    border: none;
    border-radius: var(--duc-radius-sm);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--duc-transition);
    font-family: inherit;
    min-width: 220px;
}

.duc-btn-enviar:hover:not(:disabled) {
    background: var(--duc-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(74, 144, 217, 0.3);
}

.duc-btn-enviar:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.duc-btn-enviar.duc-enviando {
    opacity: 0.7;
    pointer-events: none;
}

.duc-btn-nueva {
    display: inline-block;
    padding: 12px 30px;
    background: var(--duc-bg-light);
    color: var(--duc-primary);
    border: 2px solid var(--duc-primary);
    border-radius: var(--duc-radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--duc-transition);
    margin-top: 15px;
    font-family: inherit;
}

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

/* ============================================
   Mensajes de estado
   ============================================ */
.duc-mensaje-estado {
    margin-top: 15px;
    padding: 12px 16px;
    border-radius: 6px;
    font-size: 14px;
    text-align: center;
    animation: ducFadeIn 0.3s ease;
}

@keyframes ducFadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

.duc-mensaje-estado.duc-estado-error {
    background: var(--duc-danger-light);
    color: var(--duc-danger);
    border: 1px solid rgba(229, 57, 53, 0.2);
}

.duc-mensaje-estado.duc-estado-exito {
    background: var(--duc-success-light);
    color: var(--duc-success);
    border: 1px solid rgba(76, 175, 80, 0.2);
}

.duc-mensaje-estado.duc-estado-info {
    background: var(--duc-primary-light);
    color: var(--duc-primary);
    border: 1px solid rgba(74, 144, 217, 0.2);
}

.duc-mensaje-estado.duc-estado-warning {
    background: var(--duc-warning-light);
    color: #e65100;
    border: 1px solid rgba(255, 152, 0, 0.2);
}

/* ============================================
   Pantalla de éxito
   ============================================ */
.duc-exito {
    text-align: center;
    padding: 30px 0;
}

.duc-exito-icono {
    margin-bottom: 15px;
    animation: ducBounceIn 0.5s ease;
}

@keyframes ducBounceIn {
    0% { transform: scale(0.5); opacity: 0; }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

.duc-exito-titulo {
    font-size: 22px;
    font-weight: 700;
    color: var(--duc-success);
    margin: 0 0 8px;
}

.duc-exito-texto {
    font-size: 15px;
    color: var(--duc-text-light);
    margin: 0 0 20px;
}

.duc-exito-resumen {
    background: var(--duc-success-light);
    border-radius: var(--duc-radius-sm);
    padding: 15px;
    margin: 15px 0;
    font-size: 14px;
    color: var(--duc-text);
}

/* ============================================
   Spinner de carga
   ============================================ */
.duc-spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: ducSpin 0.6s linear infinite;
    vertical-align: middle;
    margin-right: 8px;
}

@keyframes ducSpin {
    to { transform: rotate(360deg); }
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .duc-formulario {
        padding: 20px 16px;
        margin: 0 10px;
    }

    .duc-titulo {
        font-size: 20px;
    }

    .duc-zona-drop {
        padding: 30px 15px;
    }

    .duc-campo-grupo {
        grid-template-columns: 1fr;
    }

    .duc-radio-grupo {
        grid-template-columns: 1fr;
    }

    .duc-archivo-item {
        flex-wrap: wrap;
        padding: 10px;
    }

    .duc-archivo-paginas {
        margin: 0 10px;
    }

    .duc-coste-total {
        font-size: 20px;
    }

    .duc-btn-enviar {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .duc-formulario {
        padding: 15px 12px;
        border-radius: 8px;
    }

    .duc-titulo {
        font-size: 18px;
    }

    .duc-drop-formatos {
        gap: 4px;
    }

    .duc-formato-badge {
        padding: 2px 7px;
        font-size: 10px;
    }

    .duc-archivo-item {
        gap: 8px;
    }

    .duc-archivo-icono {
        width: 34px;
        height: 34px;
        font-size: 10px;
    }

    .duc-archivo-nombre {
        font-size: 13px;
    }
}

/* ============================================
   Accesibilidad
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    .duc-formulario *,
    .duc-formulario *::before,
    .duc-formulario *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

.duc-zona-drop:focus-visible {
    outline: 3px solid var(--duc-primary);
    outline-offset: 2px;
}

/* ============================================
   Modo oscuro (respeta preferencias del sistema)
   ============================================ */
@media (prefers-color-scheme: dark) {
    .duc-formulario.duc-dark-auto {
        --duc-bg: #1e1e1e;
        --duc-bg-light: #2d2d2d;
        --duc-text: #e0e0e0;
        --duc-text-light: #b0b0b0;
        --duc-text-muted: #888888;
        --duc-border: #444444;
    }
}



/* ============================================
   Campos personalizados - Frontend (v1.2.0)
   ============================================ */
.duc-campos-personalizados {
    margin-top: 20px;
}

.duc-campo-extra {
    margin-bottom: 16px;
}

.duc-campo-extra .duc-campo-extra-label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--duc-text);
    font-size: 14px;
}

.duc-campo-extra .duc-campo-extra-label .duc-requerido {
    color: var(--duc-danger);
}

.duc-campo-extra select {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--duc-border);
    border-radius: var(--duc-radius-sm);
    font-size: 14px;
    color: var(--duc-text);
    background: var(--duc-bg);
    transition: var(--duc-transition);
    appearance: auto;
}

.duc-campo-extra select:focus {
    border-color: var(--duc-primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.1);
}

.duc-campo-extra .duc-extra-radio-grupo,
.duc-campo-extra .duc-extra-checkbox-grupo {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.duc-campo-extra .duc-extra-radio-opcion,
.duc-campo-extra .duc-extra-checkbox-opcion {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--duc-bg-light);
    border: 2px solid var(--duc-border);
    border-radius: var(--duc-radius-sm);
    cursor: pointer;
    transition: var(--duc-transition);
    font-size: 14px;
}

.duc-campo-extra .duc-extra-radio-opcion:hover,
.duc-campo-extra .duc-extra-checkbox-opcion:hover {
    border-color: var(--duc-primary);
    background: var(--duc-primary-light);
}

.duc-campo-extra .duc-extra-radio-opcion input:checked + span,
.duc-campo-extra .duc-extra-checkbox-opcion input:checked + span {
    font-weight: 600;
}

.duc-campo-extra .duc-extra-precio {
    font-size: 12px;
    color: var(--duc-text-muted);
    margin-left: 4px;
}



/* ============================================
   Integración de campos personalizados dentro
   de "Opciones de impresión" (v1.3.0)
   ============================================ */
/* Los campos personalizados ahora forman parte del bloque de opciones de
   impresión, por lo que se separan con un divisor sutil para mantener una
   sola sección visual unificada. */
.duc-opciones-impresion .duc-campos-personalizados {
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px dashed var(--duc-border);
}

/* ============================================
   Campo Concepto adicional (v1.3.0)
   ============================================ */
.duc-campo-concepto {
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px dashed var(--duc-border);
}

.duc-campo-concepto .duc-label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--duc-text);
    font-size: 14px;
}

.duc-campo-concepto .duc-precio-extra {
    font-size: 12px;
    color: var(--duc-text-muted);
    margin-left: 4px;
    font-weight: 500;
}

.duc-campo-concepto .duc-input {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--duc-border);
    border-radius: var(--duc-radius-sm);
    font-size: 14px;
    color: var(--duc-text);
    background: var(--duc-bg);
    transition: var(--duc-transition);
    box-sizing: border-box;
}

.duc-campo-concepto .duc-input:focus {
    border-color: var(--duc-primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.1);
}

/* ============================================
   Método de pago (v1.3.0)
   ============================================ */
.duc-metodo-pago {
    margin-top: 25px;
    padding-top: 25px;
    border-top: 1px solid var(--duc-border);
}

/* Reutiliza .duc-radio-grupo y .duc-radio-tarjeta de las opciones de impresión
   para mantener una apariencia coherente entre selectores. */
.duc-metodo-pago .duc-radio-grupo {
    grid-template-columns: 1fr 1fr;
}

@media (max-width: 600px) {
    .duc-metodo-pago .duc-radio-grupo {
        grid-template-columns: 1fr;
    }
}



/* ============================================
   Encuadernado con tramos de páginas (v1.4.0)
   ============================================ */
.duc-campo-encuadernado {
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px dashed var(--duc-border);
}

.duc-campo-encuadernado .duc-select-encuadernado {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--duc-border);
    border-radius: var(--duc-radius-sm);
    font-size: 14px;
    color: var(--duc-text);
    background: var(--duc-bg);
    transition: var(--duc-transition);
    appearance: auto;
}

.duc-campo-encuadernado .duc-select-encuadernado:focus {
    border-color: var(--duc-primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.1);
}

.duc-encuadernado-descripcion {
    font-size: 12px;
    color: var(--duc-text-muted);
    margin: 6px 0 0;
}