/* css resets */

* {
    margin: 0;
    padding: 0;
    text-decoration: none;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    min-height: 100svh;
}

img, picture, svg, video {
    max-width: 100%;
}

@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
        scroll-padding-top: 3rem;
    }
}

/* selfhosted fonts */

@font-face {
    font-family: 'Ubuntu';
    font-weight: 300;
    src: url(fonts/Ubuntu-Light.ttf);
}

@font-face {
    font-family: 'Comfortaa';
    font-weight: 300, 400, 500, 600, 700;
    src: url(fonts/Comfortaa-VariableFont_wght.ttf);
}

/* variables */

:root {

    /* colours */
    --cl-background: #f6f6f6;
    --cl-box: #FFFFFF;
    --cl-primary: #0778BC;
    --cl-primary-overlay: #ffffff98;
    --cl-primary-burn: #00439b;
    --cl-secondary: #181818;
    --cl-secondary-overlay: #363636;
    --cl-hero-box: #181818cc;
    --cl-text-primary: #000000;
    --cl-text-secondary: #FFFFFF;
    --cl-link-text: #0778BC;
    --cl-link-overlay: #9cd9ff7e;
    /* --cl-link-overlay-alt: #daf1ffa9; */
    --cl-link-overlay-alt: #004f80a9;

    --g-button-fx: linear-gradient(90deg, transparent, transparent, var(--cl-primary-overlay), transparent, transparent); /*gradient for the button flash effect on hover*/
    --g-ai-fx: linear-gradient(45deg, magenta, cyan); /*gradient CustomGPT border*/

    /*spacing*/
    --spc-small: 1rem;
    --spc-med: 2rem;
    --spc-large: 4rem;

    --nav-height: 4rem; /*default height of the navigation bar. Different on mobile*/
    
    /*fonts*/
    --fs-body: 1.1rem;
    --fs-title: 3rem;
    --fs-subtitle: 1.75rem;
    --fs-highlight: 1.6rem;
    --fs-nav: 1.25rem; /* for navigation menu only */
    --fs-mobile-nav: 1.6rem; /* extra size to switch to for ease of navigation */

    --font-text:  "Ubuntu", Arial, Helvetica, sans-serif;
    --font-display: "Comfortaa", Arial, Helvetica, sans-serif;
}

/* setup */

h1 {
    font-size: var(--fs-title);
}

h2 {
    font-size: var(--fs-subtitle);
}

h1, h2, h3 {
    font-family: var(--font-display);
    text-align: center;
}

p {
    font-size: var(--fs-body);
    font-family: var(--font-display);
}

.overflow p,
article p,
footer li{
    font-family: var(--font-text);
    line-height: 1.5;
    opacity: 0.75;
}

.content-grid {

    /* very important grid setup that the entire layout relies on */
    --padding-bar: 0.5rem;
    --content-max-width: 960px ;
    --breakout-width: minmax(0px, 3rem) ;

    display: grid;
    grid-template-columns: 
    [fullwidth-start] 
    minmax(var(--padding-bar), 1fr) 

    [breakout-start] 
    var(--breakout-width) 

    [content-start] 
    min(100% - (var(--padding-bar) * 4), var(--content-max-width)) 
    [content-end] 

    var(--breakout-width) 
    [breakout-end] 

    minmax(var(--padding-bar), 1fr) 
    [fullwidth-end];
    /* start and end suffix/prefix creates the grid-areas that content is assigned to */
}

.content-grid > * {
    grid-column: content;
}

.content-grid > .breakout {
    grid-column: breakout;
}

.content-grid > .fullwidth {
    grid-column: fullwidth;
}

/* main */

main {
    /* min-height: 100svh; */
    background-color: var(--cl-background);
}

nav {

    position: fixed;
    height: var(--nav-height);
    width: 100%;
    background-color: var(--cl-box);
    z-index: 99;
    box-shadow: 0px 3px 5px rgba(0,0,0,0.15);
}

.nav-container {
    display: flex;
    height: var(--nav-height);
    flex-direction: row;
    align-items: center;
    gap: 1rem;
}

.nav-container a {
    color: var(--cl-primary);
    font-weight: bold;
    font-family: var(--font-display);

}

.nav-spacer, .logo {
    height: var(--nav-height);

}

.navlist {
    display: flex;
    flex-direction: row;
    justify-content: flex-end;
    flex-grow: 4;
    height: 100%;

    list-style: none;

    font-size: var(--fs-nav);
    font-family: var(--font-text);
}

.navlist li a {
    display: grid;
    background-color: transparent;
    height: 100%;
    border:  5px solid var(--cl-box);
    border-radius: var(--spc-small);

    padding: var(--spc-small) var(--spc-med);
}

.navlist li a:hover {
    color: var(--cl-text-secondary);
    background-color: var(--cl-primary);
}

body {
    background-color: var(--cl-secondary);
    color: var(--cl-text-primary);
}

.botcard {
    display: grid;
    max-width: 40rem;
    grid-template-columns: auto auto 3rem ;
    gap: var(--spc-small);
    padding: var(--spc-small);
    margin: 0 auto 0 auto;
    /* box-shadow: 3px 5px 5px rgba(0,0,0,0.15); */

    color: var(--cl-text);
    background-color: var(--cl-box);
    /* border: 2px solid var(--cl-primary); */
    border-radius: var(--spc-small);

    cursor: pointer;
    transition: background-color 100ms;
}

.botcard-icon {
    width: 6rem;
    border-radius: var(--spc-small);
}

.botcard-arrow {
    margin:auto;
    width: 1.5rem;
    height: 1.5rem;
}

.botcard h3, .botcard h2, .botcard h1 {
    text-align: start;
    margin-bottom: var(--spc-small);
}

.botcard:hover {
    background-color: var(--cl-link-text);
    color: var(--cl-text-secondary);
    transition: background-color 100ms;
}

.botcard:hover .botcard-arrow{
    filter: brightness(100);
}

.card {
    display: grid;
    background-color: var(--cl-box);
    box-shadow: 3px 5px 5px rgba(0,0,0,0.25);
    border-radius: var(--spc-med);
    padding: calc(var(--spc-med) * 1.5);

    row-gap: var(--spc-med);
}

.card:not(:last-child) {
    margin-bottom: var(--spc-large);
}

.content-image {
    border-radius: var(--spc-med);

    margin-right: auto;
    margin-left: auto;
}

.imgscale-correction {
    max-height: 90svh; /*prevents images inside articles from ever getting larger than the screen*/
}

/*buttons*/

button {
    background-color: var(--cl-primary);

    color: var(--cl-text-secondary);
    font-size: var(--fs-subtitle);
    font-family: var(--font-text);
    border: none;
    cursor: pointer;

    border-radius: 0.5em;
    padding: 0.8em 1.2em;

    transition: 00ms;
}


button:active {
    background-color: var(--cl-primary-burn);
    transition: background-color 0ms;
} 


.button-alt {
    background-color: var(--cl-secondary-overlay);
}

.button-alt:active {
    background-color: var(--cl-text-primary);
    transition: background-color 0ms;
}

/*hero, header & call to action*/

.hero {
    background-color: var(--cl-secondary); /* fallback */
    /* background-image: url(media/bg-ai.jpg);  */
    background-size: cover;
    background-position: top;
    background-attachment: fixed;

    display: grid;
    align-content: center;
    min-height: 50svh; /*hero section always fills half the screen on initial arrival*/
    color: var(--cl-text-secondary);
    padding-top: var(--spc-med);
    padding-bottom: calc(var(--spc-large) * 1.5) ;
    row-gap: clamp(var(--spc-small), 4svh, 8rem);
}

.cta {
    max-width: 75%;
    display: grid;
    grid-template-columns: 3rem 1fr;
    gap: var(--spc-med);

    color: var(--cl-text-secondary);
    background-color: var(--cl-hero-box);
    background-blend-mode: multiply;

    border-radius: var(--spc-med);
    padding: var(--spc-med);
}

.cta-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: clamp(2rem, 10vw, 200px); /*carefully tweaked values to scale the gap between buttons up to large screen sizes.*/
}

.cta p {
    font-size: var(--fs-highlight);
}

.overflow {
    transform: translateY(calc(-1 * (var(--spc-large)))); /*creates the effect of the first article overlapping the hero element*/
}

.center {
    justify-self: center;
    justify-content: center;
    align-items: center;
}

.bar {
    padding-top: var(--spc-med);
    padding-bottom: var(--spc-med);
    margin-bottom: var(--spc-med);
    row-gap: var(--spc-small);

    background-color: var(--cl-primary);
    color: var(--cl-text-secondary);
    font-size: var(--fs-highlight);
}

.bar p {
    opacity: 0.9;
}


/*footer*/

footer {
    padding: var(--spc-large);
    background-color: var(--cl-secondary);
    color: var(--cl-text-secondary);
    list-style: none;
    text-decoration: none;

}

footer ul {
    padding: var(--spc-small);
    color: #0778BC;
    list-style: none;
    text-decoration: none;
    margin-bottom: var(--spc-small);
}

footer a {
    color: var(--cl-text-secondary);
}

.flexwrapper {
    display: flex;
    flex-flow: row wrap;
    gap: var(--spc-med);
    place-content: space-around;
}

#languagetoggle {
    display: none;
}

#language-controller > div {
    display: grid;
    grid-template-columns: auto auto auto;
    background-color: var(--cl-secondary-overlay);
    place-items: center left;
    padding: 0.5rem;
    border-radius: var(--spc-small);
    cursor: pointer;
    z-index: 2;
    position: relative;
}


.language-dropdown {
    transform: scaleY(0);
    transform-origin: top;
    transition: 100ms;
    background-color: var(--cl-box);
    margin-top: calc((var(--spc-med) + 1rem) * -0.5);
    z-index: 1;
    position: relative;
    padding: 0;
    border-radius: 0 0 var(--spc-small) var(--spc-small);
    margin-bottom: 0;
}

.language-dropdown li {
    margin: 0;
    opacity: 1;
    padding-inline: 0.5rem;
}

.language-dropdown li a{
    color: var(--cl-primary);
    display: grid;
    padding-top: 0.25rem;
    padding-bottom: 0.25rem;
    margin-bottom: 0.25rem;
    place-items: center left;
    grid-template-columns: auto auto auto;
    border-radius: var(--spc-small);
}

.language-dropdown li a:hover{
    background-color: var(--cl-primary);
    color: var(--cl-text-secondary);
}

.language-dropdown div:last-child {
    height: 0.25rem;
}

.lang-arrow {
    height: 1rem;
    transform: rotate(90deg);
    filter: brightness(100);
}

.flag {
    height: var(--spc-med);
    border-radius: var(--spc-small);
}

#languagetoggle:checked ~ #language-controller .language-dropdown {
    transform: scaleY(1);
    transition: 100ms;

}

#languagetoggle:checked ~ #language-controller .lang-arrow {
    transform: rotate(-90deg);
    transition: 100ms;
    filter: brightness(1);

}

#languagetoggle:checked ~ #language-controller > div {
    background-color: var(--cl-box);
    color: var(--cl-primary);
}

/*main content styling*/

article ul {
    padding: var(--spc-med);
    margin-inline: auto;
    background-color: #f6f6f6;
    border-radius: var(--spc-small);
    max-width: 65ch;
}

p a {
    background-color: var(--cl-link-overlay) ;
    padding-block: 0.25em;
    padding-inline: 0.45em;
    border-radius: 0.5em;
    text-decoration: none;
    color: var(--cl-link-text);
    /* font-weight: 600; */
}

.bar p a {
    background-color: var(--cl-link-overlay-alt) ;
    padding-block: 0.25em;
    padding-inline: 0.45em;
    border-radius: 0.5em;
    text-decoration: none;
    color: var(--cl-text-secondary);
    opacity: 1;
    /* font-weight: 600; */
}

p a::before {
    content: '';
    position: relative;
    top: 0.25em;
    background-image: url(media/Link.svg);
    background-size: contain;
    width: 1.2em;
    height: 1.2em;
    display: inline-block;
}

.bar p a::before {
    background-image: url(media/LinkW.svg );
}


/* visual effect classes */

.shine-fx {
    background-image: var(--g-button-fx);
    background-size: 400%;
    background-position: left;

    transition: background-position 0ms;

}

.shine-fx:hover{
    background-position: right;

    transition: background-position 500ms;
}

.shine-fx:active{
    background-position: right;

    transition: background-position 0ms;
}

/* Responsive layouts */

#nav-toggle {
    position: fixed;
    display: none;
}

.nav-open {
    display: inline;
}

.nav-closed {
    display: none;
    
}

.nav-controller {
    position: fixed;
    width: var(--nav-height);
    height: var(--nav-height);
    right: 0;

    background-color: var(--cl-box);
    border-radius: var(--spc-small);
    border: 5px solid var(--cl-box);
}

.nav-icon {
    position: relative;
    top: 0;
    right: 0;
    height: 100%;
    padding: 12%;

}

.nav-controller:hover .nav-icon {
    filter: brightness(100) grayscale(1);
}

.nav-controller:hover {
    background-color: var(--cl-primary);


}

.mobile-only {
    display: none;
}

@media (max-width: 1100px) {

    :root {
        --fs-body: 1rem;
        --fs-title: 2.25rem;
        --fs-subtitle: 1.5rem;
        --fs-highlight: 1.25rem;
        --fs-nav: 1.15rem;
    }

    button {
        font-size: var(--fs-highlight);
    }
}

@media (max-width: 650px) {

    :root {
        --fs-body: 1rem;
        --fs-title: 2rem;
        --fs-subtitle: 1.4rem;
        --fs-highlight: 1.2rem;
        --fs-nav: 1.1rem;

        --spc-small: 0.75rem;
        --spc-med: 1.25rem;
        --spc-large: 2rem;

        --nav-height: 5rem;
    }

    .mobile-only {
        display: inline;
    }

    button {
        font-size: var(--fs-nav);
    }

    .cta {
        max-width: 90%;
    }

    .navlist li a {
        padding: var(--spc-med) var(--spc-large);
        border-radius: var(--spc-med);
    }

    .navlist {
        flex-direction: column;
        transform: scaleY(0);
        transform-origin: top;

        position: fixed;
        height: min-content;
        top: calc(var(--nav-height) + var(--spc-small));
        right: var(--spc-small);

        background-color: var(--cl-box);
        border-radius: var(--spc-med);
        box-shadow: 3px 5px 5px rgba(0,0,0,0.25);

        font-size: var(--fs-mobile-nav);
    }

    #nav-toggle:checked ~ .navlist {
        transform: scaleY(1);
    }
    
    #nav-toggle:checked ~ .nav-controller {
        background-color: var(--cl-primary);
    }

    #nav-toggle:checked ~ .nav-controller .nav-icon {
        filter: brightness(100) grayscale(1);
    }

    #nav-toggle:checked ~ .nav-controller .nav-closed {
        display: inline;
    }

    #nav-toggle:checked ~ .nav-controller .nav-open {
        display: none;
    }
}