* {
    box-sizing: border-box;
}

/* define color variables */
:root {
    --header-bg: #69abce;
    --body-bg: #d1f1f2;
    --navbar-text-color: black;
    --body-text-color: #363636;
    --logo-shadow-color: grey;
}

/* dark mode color themes. Only applied when :root also has a dark-mode class. */
:root.dark-mode {
    --header-bg: #1a255b;
    --body-bg: #090b13;
    --navbar-text-color: #0a53be;
    --body-text-color: #DCDCDC;
    --logo-shadow-color: #232323;
}


/* Header Starts */
body {
    background-color: var(--body-bg);
    color: var(--body-text-color);
}

body nav {
    padding: 0 !important;
    position: relative;
    background-color: var(--header-bg);
}

.navbar button {
    border-color: var(--body-bg);
}

.navbar-brand {
    display: flex;
    align-items: center;
    text-shadow: 3px 2px 2px var(--logo-shadow-color);
}

#brand-logo {
    width: 2.5em;
    height: 2.5em;
}

.nav-link {
    text-align: center;
    margin: 2px;
    color: var(--navbar-text-color);
}

.navbar-nav {
    margin: 2px;
}

#brand-text {
    font-size: 160%;
    color: var(--navbar-text-color);
    margin: 0 10px 0 10px;
}

.navbar-brand:hover > #brand-text {
    color: var(--body-bg);
}

/* sm and higher */
@media (min-width: 576px) {
    #brand-logo {
        height: 4em;
        width: 4em;
    }

    #brand-text {
        /* to align logo and navbar menu text */
        margin: 10px;
    }
}

.nav-link:hover, .nav-link.active {
    background-color: var(--body-bg);
    color: var(--navbar-text-color) !important;
    border-radius: 5px;
}

/* Header Ends */


@media (prefers-color-scheme: light) {

}

@media (prefers-color-scheme: dark) {

}

/* main content begins */
.main-content {
    background-color: var(--body-bg);
    padding: 5px;
    text-align: center;
    color: var(--body-text-color);
}