:root {
    --mat-primary: var(--mat-primary-color, #4CAF50);
    --mat-secondary: #2196F3;
    --mat-success: #4CAF50;
    --mat-error: #f44336;
    --mat-bg-card: #ffffff;
    --mat-text: #333333;
    --mat-border: #e0e0e0;
    --mat-shadow: 0 4px 6px rgba(0,0,0,0.1);
    --mat-radius: 12px;
}

.matematicas-container {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 800px;
    margin: 20px auto;
    color: var(--mat-text);
}

.mat-card {
    background: var(--mat-bg-card);
    border-radius: var(--mat-radius);
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: var(--mat-shadow);
    border: 1px solid var(--mat-border);
}

.mat-card h2 {
    margin-top: 0;
    color: var(--mat-primary);
    font-size: 1.5rem;
    border-bottom: 2px solid var(--mat-primary);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.mat-form-group {
    margin-bottom: 15px;
}

.mat-form-group label {
    display: block;
    font-weight: bold;
    margin-bottom: 12px;
    font-size: 1.4rem; /* Fuente más grande solicitada */
    color: var(--mat-text);
}

.mat-form-group select,
.mat-form-group input[type="number"] {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--mat-border);
    border-radius: 8px;
    font-size: 1.3rem; /* Fuente más grande solicitada */
}

.mat-btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
    text-align: center;
    text-decoration: none;
    font-size: 1rem;
}

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

.mat-btn-primary:hover {
    filter: brightness(0.9);
}

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

.mat-btn-outline {
    background-color: transparent;
    border: 2px solid var(--mat-primary);
    color: var(--mat-primary);
}

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

/* Estadísticas */
.mat-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
}

.mat-stat-item {
    text-align: center;
    padding: 15px;
    background: #f9f9f9;
    border-radius: 8px;
}

.mat-stat-label {
    display: block;
    font-size: 0.9rem;
    color: #666;
}

.mat-stat-value {
    display: block;
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--mat-primary);
}

/* Ejercicios */
#mat-lista-ejercicios {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.mat-ejercicio-row {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 20px;
    background: #fff;
    border: 1px solid var(--mat-border);
    border-radius: var(--mat-radius);
    gap: 15px;
    text-align: right;
}

.mat-operacion {
    font-size: 2rem;
    font-weight: bold;
    font-family: 'Courier New', Courier, monospace;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    position: relative;
    padding-bottom: 5px;
    width: fit-content;
    margin: 0 auto;
}

/* Llevadas */
.mat-operando {
    font-size: 2.5rem; /* Más grande para legibilidad */
    font-family: 'Courier New', Courier, monospace;
    display: flex;
    justify-content: flex-end;
    width: 100%;
    line-height: 1.2;
}

.mat-digit-span {
    width: var(--mat-op-col-width, 45px);
    text-align: center;
    display: inline-block;
}

.mat-llevadas, .mat-llevadas-resta {
    display: flex;
    justify-content: flex-end;
    width: 100%;
    height: 35px;
}

.mat-llevada-input {
    width: var(--mat-op-col-width, 45px) !important;
    height: 35px !important;
    padding: 0 !important;
    margin: 0 !important;
    font-size: 1.4rem !important;
    text-align: center !important;
    border: none !important;
    color: var(--mat-llevadas-color) !important;
    background: transparent !important;
    font-weight: bold !important;
    pointer-events: none;
    font-family: 'Courier New', Courier, monospace !important;
}

.mat-llevada-input[readonly] {
    opacity: 0; /* Por defecto ocultas */
    transition: opacity 0.3s ease;
}

.mat-llevada-input.is-visible {
    opacity: 1;
}

.mat-llevada-spacer {
    width: var(--mat-op-col-width, 45px);
}

.mat-digit-input-wrapper {
    width: var(--mat-op-col-width, 45px);
    display: flex;
    justify-content: center;
}

.mat-operando-final {
    border-bottom: 3px solid var(--mat-text);
    width: 100%;
    text-align: right;
    position: relative;
    margin-bottom: 10px;
}

.mat-simbolo-operacion {
    position: absolute;
    left: -40px;
    bottom: 5px;
    font-size: 2rem;
}

.mat-input-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    width: 100%;
}

/* Resultado Segmentado */
.mat-resultado-segmented {
    display: flex;
    flex-direction: row-reverse; /* De derecha a izquierda */
    justify-content: center;
    gap: 0; /* Sin gap para alinear con los números de arriba */
    width: 100%;
}

.mat-digit-input {
    width: var(--mat-res-width, 65px) !important;
    height: 65px !important;
    padding: 5px !important;
    font-size: var(--mat-res-font-size, 2rem) !important;
    text-align: center !important;
    border: 3px solid var(--mat-res-border) !important;
    border-radius: 8px !important;
    font-family: 'Courier New', Courier, monospace !important;
    font-weight: bold !important;
    background: var(--mat-res-bg) !important;
    color: var(--mat-res-color) !important;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
    appearance: textfield;
    -moz-appearance: textfield;
}

.mat-digit-input::-webkit-outer-spin-button,
.mat-digit-input::-webkit-inner-spin-button {
    -webkit-appearance: none; /* Quitar flechas en Chrome/Safari */
    margin: 0;
}

.mat-digit-input.mat-digit-leftmost {
    width: calc(var(--mat-res-width, 65px) + 30px) !important; /* Dinámico */
}

.mat-digit-input:focus {
    border-color: var(--mat-primary) !important;
    background: #fff !important;
    outline: none;
}

.mat-input-res {
    display: none; /* Ocultamos el input antiguo si existe */
}

.mat-input-res:focus {
    border-color: var(--mat-primary);
    outline: none;
}

.mat-feedback {
    min-height: 24px;
    font-weight: bold;
    text-align: center;
    margin-top: 10px;
}

.mat-feedback.correcto {
    color: var(--mat-success);
}

.mat-feedback.incorrecto {
    color: var(--mat-error);
}

.mat-actions {
    margin-top: 30px;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

/* Botón de comprobación dinámico */
.btn-comprobar {
    transition: all 0.3s ease;
}

.btn-comprobar.is-correct {
    background-color: var(--mat-success) !important;
    border-color: var(--mat-success) !important;
    color: white !important;
    pointer-events: none;
}

.btn-comprobar.is-incorrect {
    background-color: var(--mat-error) !important;
    border-color: var(--mat-error) !important;
    color: white !important;
}

.mat-resultado-final-text {
    font-size: calc(var(--mat-res-font-size, 2.5rem) * 1.2); /* Un poco más grande que el input */
    font-weight: bold;
    color: var(--mat-success);
    font-family: 'Courier New', Courier, monospace;
    letter-spacing: var(--mat-op-col-width, 45px); /* Alineado con el ancho de columna */
    margin-top: 20px; /* Más espacio respecto al botón */
    width: 100%;
    text-align: center;
    padding-right: var(--mat-op-col-width, 45px); /* Compensar letter-spacing */
    display: block;
}

/* Estilos de impresión corregidos */
@media print {
    @page {
        margin: 1cm;
        size: A4 portrait;
    }
    .mat-card {
        break-inside: avoid;
        page-break-inside: avoid;
        margin-bottom: 20px !important;
        padding: 15px !important;
        border: 1px solid #ddd !important;
        box-shadow: none !important;
    }
    body * {
        visibility: hidden;
    }
    #mat-wrapper-print, #mat-wrapper-print * {
        visibility: visible;
    }
    #mat-wrapper-print {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        max-width: 100% !important;
    }
    .mat-btn, .mat-stats-container, #mat-config, .mat-actions, .btn-comprobar, .mat-feedback {
        display: none !important;
    }
    #mat-lista-ejercicios {
        display: grid !important;
        /* Responsive: intenta 2 columnas, pero baja a 1 si no hay espacio */
        grid-template-columns: repeat(auto-fit, minmax(45%, 1fr)) !important;
        gap: 20px !important;
        width: 100% !important;
        justify-content: center !important;
    }
    .mat-ejercicio-row {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
    }
    /* Reducir un poco el tamaño en impresión si hay muchos dígitos */
     .mat-operando {
         font-size: 1.8rem !important; /* Un poco más pequeño para asegurar que quepa */
     }
     .mat-digit-span, .mat-llevada-input, .mat-llevada-spacer, .mat-digit-input-wrapper {
         width: clamp(25px, var(--mat-op-col-width), 40px) !important;
     }
     .mat-digit-input {
         width: clamp(40px, var(--mat-res-width), 60px) !important;
         font-size: 1.5rem !important;
         height: 50px !important;
     }
     .mat-digit-input.mat-digit-leftmost {
         width: clamp(60px, calc(var(--mat-res-width) + 20px), 80px) !important;
     }
 }

/* Responsive */
@media (max-width: 768px) {
    #mat-lista-ejercicios {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    #mat-lista-ejercicios {
        grid-template-columns: 1fr;
    }
}