body {
    font-family: Arial;
    margin: 30px;
}

/* GRID */

#grid {
    display: grid;
    grid-template-columns: 80px repeat(5, 1fr);
    margin-top: 20px;
    position: relative;

    /* líneas de la grilla */
    background-image: linear-gradient(#e5e5e5 1px, transparent 1px), linear-gradient(90deg, #e5e5e5 1px, transparent 1px);

    background-size: 100% 40px, calc((100% - 80px) / 5) 100%;

    background-position: 0 0, 80px 0;
}

.cell {
    height: 40px;
    font-size: 12px;
    position: relative;
}

.header {
    background: #f5f5f5;
    font-weight: bold;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* BLOQUES DE MATERIAS */

.bloque {
    position: absolute;
    left: 2px;
    right: 2px;

    color: white;
    font-size: 15px;
    font-weight: bold;

    border-radius: 6px;
    padding: 4px;

    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;

    z-index: 10;

    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* BOTÓN BORRAR */

.borrar {
    margin-left: 10px;
    color: red;
    cursor: pointer;
    font-weight: bold;
}

/* Modal básico */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}

.modal-content {
    background: white;
    padding: 20px;
    border-radius: 8px;
    min-width: 300px;
}