* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
@media (max-width: 768px) {
    .contenido {
        flex-direction: column;
    }
    .panel-datos,
    .panel-canvas {
        width: 100%;
    }
    .fila input {
        width: 100%;
    }
    .boton{
        width: 100%;
        font-size: 16px;
        padding: 12px;
    }
    #resultado {
        font-size: 14px;
        line-height: 1.5;
    }
    canvas {
        width: 100%;
        height: auto;
    }
}
body {
    background-image: url("images/textura_pared.png");
    font-family: Arial, sans-serif;
}
.contenedor {
    width: 90%;
    max-width: 1000px;
    padding: 10px;
    margin: 0 auto;
}
.cabecera {
    padding: 20px;
    border-radius: 12px;
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    color: #e5e5e5;
    border: 2px solid #000;
    margin-bottom: 15px;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}
.contenido {
    display: flex;
    gap: 15px;
}
.panel-datos {
    margin-bottom: 15px;
    color: #0c0331;
    flex: 1;
    background: #f8f9fb;
    font-size: 13px;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.fila {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}
.fila label {
    font-size: 14px;
    color: #555;
    min-width: 40px;
}
.fila input {
    width: 80px;
    padding: 8px;
    font-size: 14px;
}

.unidad {
    font-size: 14px;
    color: #777;
}
.boton {
    margin-top: 10px;
    padding: 10px;
    border:  none;
    border-radius: 8px;
    background: linear-gradient(135deg, #4a6fa5, #3b5c8a);
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: 0.2s ease;
}
.boton:hover{
    background: linear-gradient(135deg, #3b5c8a, #2f4a70);
}
#resultado {
    margin-top: 15px;
    background: #e6f4ea;
    padding: 12px;
    border-radius: 10px;
    font-size: 14px;
    line-height: 1.4;
}
.panel-canvas {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 15px;
    padding: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}
h3 {
    display: flex;
    align-items: center;
    gap: 10px;
}
h3::after {
    content: "";
    flex: 1;
    height: 1px;
    background: #ddd;
}
.grupo {
    display: flex;
    align-items: center;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    background: #f9fafb;
    overflow: hidden;
}
.grupo input {
    border: none;
    outline: none;
    padding: 8px;
    flex: 1;
    background: transparent;
    font-size: 14px;
}
.grupo span {
    padding: 8px 10px;
    background: #eef1f5;
    border-left: 1px solid #d1d5db;
    font-size: 13px;
    color: #555;
}