html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    width: 100%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 16px;
    background-color:#E9ECEF;
    position: relative;
    line-height: 1.6;

}

#btnArrow {
    display: inline-block;
    width:60px;
    height:60px;
    border-radius: 15px 15px 0px 0px;
    background-color:#3d0e72; /*#3d0e72;*/
    /*border: 2px solid hsl(249, 53%, 60%);*/
    text-align: center;
    text-decoration: none;
    position: fixed;
    right: 20px;
    bottom: 30px;
}

#btnArrow a {
    color: #ffffff;
    font-size: 40px;
}


/* footer */
.footer{ 
    clear:both;
    color: #fff;
    background-color: #1976D2;
    position: relative;
    height: auto;
}
.footer-copyright{
    padding: 20px 0 10px 0;
    font-size: 18px;
    text-align: center;
    border-top: 1px solid rgba(238, 234, 243, 0.4);
    color: #fff;
}

.links-footer,
.subtitles-footer{
    padding-left: 50px;
}

.links-footer li a{
    color: #fff;
}
.links-footer li a:hover{
    color: #FFCA28;
    text-decoration: none;
}

.links-footer li a,
.links-footer li a:active,
.links-footer li a:focus{
    outline: none;
    text-decoration: none;
    color: #000000;
}

h1 {
    color: #2c3e50;
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 10px;
    border-bottom: 2px solid #3498db;
}

h2 {
    color: #2c3e50;
    margin-top: 30px;
    padding-bottom: 5px;
    border-bottom: 1px solid #ddd;
}

.seccion {
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.sin-cumple {
    color: #7f8c8d;
    font-style: italic;
    padding: 10px;
}

.alumno {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 15px;
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 5px;
    background-color: #f8f9fa;
}

.alumno-info {
    display: flex;
    flex-direction: column;
}

.alumno-label {
    font-weight: bold;
    color: #3498db;
    margin-bottom: 3px;
    font-size: 0.9em;
}

.alumno-valor {
    color: #2c3e50;
}

.hoy .alumno {
    background-color: #e8f8f5;
    border-left: 4px solid #2ecc71;
}

.semana .alumno {
    background-color: #eaf2f8;
    border-left: 4px solid #3498db;
}

.mes .alumno {
    background-color: #fef9e7;
    border-left: 4px solid #f39c12;
}

.dias-faltantes {
    background-color: #3498db;
    color: white;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.85em;
    display: inline-block;
    margin-top: 5px;
}

.hoy .dias-faltantes {
    background-color: #2ecc71;
}

.semana .dias-faltantes {
    background-color: #3498db;
}

.mes .dias-faltantes {
    background-color: #f39c12;
}

/* alumnos */
.dt-buttons .btn {
    margin-right: 0px;
}

@media (max-width: 768px) {
    .alumno {
        grid-template-columns: 1fr;
        gap: 10px;
    }
}