:root {
    --sp-yellow: #fcbd00;
    --sp-nav-height: 70px;
    --sp-background-color: #EFECE9;
    --sp-text-color: #0773c0;
    --sp-background-image: url('../img/elrodion-paper-753508_1280.jpg');
}

body {
    padding-top: var(--sp-nav-height);
    background-color: var(--sp-background-color);
    background-image: var(--sp-background-image);
    background-size: cover;
    background-position: center;
    /*background-repeat: no-repeat;
    background-attachment: fixed;*/

    /* Make the page at least as tall as the viewport to push the footer to the bottom */
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.text-sciprep {
    color: var(--sp-yellow);
}

.btn-sciprep {
    background-color: var(--sp-yellow);
    color: black;
}

.title-mathseries {
    color: var(--sp-text-color);
}

span.SPlogo {
    -webkit-text-stroke: 1px black;
    font-weight: bold;
    font-family: 'Arial', sans-serif;
}

span.SPlogo::before {
    content: 'Sci-';
    color: var(--sp-yellow);
}

span.SPlogo::after {
    content: 'Prep';
    color: white;
}

.navbar-toggler {
    color: var(--sp-yellow);
    border-color: var(--sp-yellow);
    background-color: var(--sp-yellow);
    width: 56px;
    height: 40px;
}

.navbar-nav .nav-item a.nav-link {
    font-size: 18px;
    color: #fff;
    margin: 0 10px;
    padding: 0 0 3px 0;
    display: inline-block;
    position: relative;
}

.navbar-nav .nav-item a.nav-link:before {
    position: absolute;
    content: "";
    width: 0;
    height: 2px;
    background-color: var(--sp-yellow);
    bottom: 0;
    left: 0;
    transition: 0.2s ease-in;
}

.navbar-nav .nav-item a.nav-link:hover:before {
    width: 100%;
}

.navbar-nav .nav-item a.nav-link.active:before {
    width: 100%;
}

.navbar-nav .nav-item a.nav-link.active {
    color: #fff;
}

.navbar-light .navbar-nav .nav-link:focus,
.navbar-light .navbar-nav .nav-link:hover {
    color: #fff;
}

.footer-title {
    color: var(--sp-yellow);
}

footer .nav-link {
    color: #fff;
}

footer .nav-link:hover {
    color: var(--sp-yellow);
}

footer .nav-link.active {
    color: var(--sp-yellow);
}

footer .nav-link:focus {
    color: var(--sp-yellow);
}

.parallax {
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    height: 500px;
    position: relative;
    top: calc(-1 * var(--sp-nav-height));
}

.parallax-caption {
    position: absolute;
    bottom: 30px;
    left: 20px;
    color: #fff;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.parallax-caption h3 {
    font-size: 2rem;
    font-weight: bold;
}

.parallax-caption p {
    font-size: 1.2rem;
}

.parallax-1 {
    background-image: url('/img/cover.png');
}


@media screen and (min-width: 1200px) {
    .navbar-brand img {
        height: 50px;
    }
}

@media screen and (max-width: 1200px) {
    .navbar-brand img {
        height: 45px;
    }
}

@media screen and (max-width: 576px) {
    .navbar-brand img {
        height: 30px;
    }
}