:root{
    --ff-barlow: 'Barlow', sans-serif;
    --fw-xlight: 200;
    --fw-light: 300;
    --fw-normal: 500;
    --color-white: #fff; 
    --color-grey: #ccc;
    --color-grey-dark: #888;
}


/* html */
html{
    font-size: 100%; /*16px*/
}

body{
    font-family: var(--ff-barlow);
    font-weight: var(--fw-xlight);
}

section,
.container-fluid,
.carousel{
    max-width: 1920px;
    margin: 0 auto;
}

/* general classes */
.title{
    font-size: 3.125rem; /* 50px/16px */
}

.subtitle{
    font-size: 1.875rem; /* 30px/16px */
    font-weight: var(--fw-xlight);
}

.subtitle-sm{
    font-size: 1.75rem; /* 28px/16px */
}

.text-lg{
    font-size: 1.125rem; /* 18px/16px */
}

.text-justify{
    text-align: justify;
}

.bg-img{
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
}

.bg-img_logo{
    background-image: url(/images/bg/bg-img-logo.png);
}

.bg-img_citation-1{
    background-image: url(/images/citations/citation-image-1.jpg);
}

.bg-img_citation-2{
    background-image: url(/images/citations/citation-image-2.jpg);
}

.bg-img_citation-3{
    background-image: url(/images/citations/citation-image-3.jpg);
}

.bg-img_citation-4{
    background-image: url(/images/citations/citation-image-4.jpg);
}

.bg-shadow{
    background-color: rgba(0, 0, 0, .5);
    height: inherit;
}


/* bootstrap */
.container{
    max-width: 800px;
    padding-top: 3rem;
    padding-bottom: 3rem;
}

.navbar.bg-dark{
    background-color: transparent !important;
}

.navbar-toggler-icon {
    background-image: url(/css/"data:image/svg+xml,%3csvg xmlns='http:/www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'%3e%3cpath stroke='rgb(255, 255, 255)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.nav-link{
    color: var(--color-white);
}

.offcanvas.show .nav-link{
    color: #000;
}

.nav-link:hover{
    color: var(--color-grey);
}

.nav-link:focus{
    color: var(--color-grey);
}

.carousel-item{
    height:700px;
    background-size: cover;
    background-position: center
}

.carousel-item:after{
    width: 100%;
    height: 100%;
    content: "";
    position: absolute;
    background-color: black;
    top: 0;
    left: 0;
    opacity: 50%;
}

.carousel-caption{
    z-index: 1;
    text-align: start;
    text-transform: uppercase;
    bottom: unset;
    /* .logo-img height = 10rem */
    top: calc(calc(100% - 10rem)/2 + 10rem - 2em);
    /* top: 50%; */
}

.form-control{
    color: var(--color-white);
}

.form-control:focus{
    box-shadow: none;
    color: inherit;   
}

.form-control::placeholder{
    color: var(--color-grey-dark);
}


/* components */
.logo-img{
    height: 10rem;
}

.citation-item{
    height: 31.25rem;
}

.citation-item__figure{
    width: 25rem;
}


@media(max-width: 768px){
    .title{
       font-size: 2rem; 
    }
    .logo-img{
        height: 5rem;
    }
    .carousel-item{
        height: 350px;
    }
    .carousel-caption{
        top: calc(calc(100% - 5rem)/2 + 5rem);
    }
    .navbar.bg-dark{
        background-color: rgba(var(--bs-dark-rgb), var(--bs-bg-opacity)) !important;
    }
}

@media(max-width: 576px) {
    .title{
        font-size: 1.5rem;
    }
    .logo-text{
        font-size: 1rem;
    }
    .citation-item__figure{
        max-width: 18rem;
    }
}

@media(max-width: 375px) {
    .logo-text{
        display: none;
    }
}