/* *** Reset *** */

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body,
html {
    height: 100%;
}

nav ol,
nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

/* *** Palette *** */

:root {
    --color-primary-60: lch(60% 27 212);
    --color-primary-50: lch(50% 27 212);
    --color-primary-40: lch(40% 27 212);
    --color-primary-30: lch(30% 27 212);
    --color-primary-20: lch(20% 27 212);
    --color-primary-10: lch(10% 27 212);
    --color-secondary-80: lch(80% 12 206);
    --color-secondary-90: lch(90% 12 206);
    --color-secondary-100: lch(100% 12 206);
    --color-neutral-95: lch(95% 1 200);
    --color-neutral-90: lch(90% 1 200);
    --color-neutral-80: lch(80% 1 200);
    --color-neutral-50: lch(50% 1 200);
    --color-neutral-40: lch(40% 1 200);
    --color-neutral-20: lch(20% 1 200);
    --color-neutral-10: lch(10% 1 200);
    --drop-shadow-bottom: 0 2px 3px rgba(0, 0, 0, 0.3);
    --drop-shadow-bottom-right: 2px 2px 3px rgba(0, 0, 0, 0.3);
    --text-shadow: 2px 2px black;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
}

body {
    background-color: var(--color-neutral-95);
}

/* *** Typography *** */

body,
button,
input,
textarea {
    color: var(--color-neutral-10);
    font-family: "Source Sans 3", sans-serif;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    margin-bottom: .5rem;
}

p {
    margin-bottom: 1rem;
}

small {
    font-size: .875rem;
}

menu,
ol,
ul {
    margin-left: 1.5rem
}

a {
    color: var(--color-primary-40);
}

a:hover {
    color: var(--color-primary-20);
}

a:active {
    color: var(--color-neutral-10);
}

@media screen and (min-width: 1920px) {
    body,
    button,
    input,
    textarea {
        font-size: 1.125rem;
    }
}

/* *** Media *** */

img {
    border-radius: var(--border-radius-md);
    width: 100%;
    height: auto;
}

article img {
    margin-bottom: 1rem;
}

/* *** Forms *** */

button {
    background: linear-gradient(0deg, var(--color-primary-30), var(--color-primary-50));
    border: 1px solid var(--color-primary-10);
    border-radius: var(--border-radius-sm);
    color: white;
    cursor: pointer;
    font-weight: 600;
    padding: .5rem 1rem;
}

button:hover {
    background: linear-gradient(0deg, var(--color-primary-20), var(--color-primary-40));
}

button:active {
    background: var(--color-primary-40);
}

input,
textarea {
    border: 1px solid var(--color-neutral-50);
    border-radius: var(--border-radius-sm);
    padding: .5rem 1rem;
    width: 100%;
}

input::placeholder,
textarea::placeholder {
    color: var(--color-neutral-40);
}

.icon-button {
    align-items: center;
    background: none;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    display: flex;
    padding: 0.25rem;
}

.icon-button:hover {
    background: var(--color-secondary-100);
}

.icon-button:active {
    background: white;
}

/* *** Icons *** */

.icon {
    fill: var(--color-neutral-10);
}

/* *** Site Layout *** */
body {
    display: flex;
    flex-direction: column;
}

/* Banner */

.gc-banner {
    align-items: center;
    background-color: var(--color-secondary-80);
    box-shadow: var(--drop-shadow-bottom);
    display: flex;
    flex-shrink: 0;
    height: 64px;
    padding: .5rem;
}

.gc-lockup {
    align-items: center;
    display: flex;
}

.gc-logo {
    width: 200px;
}

.gc-tagline {
    display: none;
}

@media screen and (min-width: 768px) {
    .gc-tagline {
        color: white;
        display: unset;
        font-size: 1.5rem;
        font-weight: 700;
        line-height: 0;
        margin: 0 0 0 auto;
        text-shadow: var(--text-shadow);
    }
}

@media screen and (min-width: 1280px) {
    .gc-banner {
        padding: 0 1rem;
    }
}

/* Main Menu */

.gc-menu {
    background-color: white;
    box-shadow: var(--drop-shadow-bottom);
    display: none;
}

.gc-button {
    align-items: center;
    border-left: 4px solid transparent;
    color: var(--color-neutral-20);
    display: flex;
    height: 48px;
    text-decoration: none;
    padding: .5rem;
}

.gc-button:hover {
    color: var(--color-primary-40);
    background-color: var(--color-neutral-95);
    border-left-color: var(--color-primary-40);
}

.gc-button:active {
    color: black;
    border-left-color: var(--color-primary-40);
}

.gc-button.selected,
.gc-button.selected:hover {
    color: black;
    background-color: white;
    border-left-color: var(--color-neutral-50);
}

.gc-menu-buttons {
    margin-left: auto;

    .gc-close-menu {
        display: none;
    }
}

@media screen and (min-width: 768px) {
    .gc-menu {
        display: flex;
        padding: 0 .5rem;

        li {
            display: inline-block;
        }
    }

    .gc-button {
        border-left: none;
        border-bottom: 4px solid transparent;
        min-width: 100px;
    }

    .gc-button:hover {
        background: none;
        border-bottom-color: var(--color-primary-40);
    }

    .gc-button:active {
        border-bottom-color: var(--color-primary-40);
    }

    .gc-button.selected,
    .gc-button.selected:hover {
        border-bottom-color: var(--color-neutral-50);
    }

    .gc-menu-buttons {
        display: none;
    }
}

@media screen and (min-width: 1280px) {
    .gc-menu {
        padding: 0 1rem;
    }
}

/* Footer */

.gc-footer {
    background-color: var(--color-neutral-80);
    color: var(--color-neutral-20);
    margin-top: auto;
    padding: .5rem .5rem 1rem .5rem;
}

.gc-footer-links {
    align-items: center;
    display: flex;

    p {
        margin: 0;
    }
}

.gc-footer-menu {
    display: flex;
    padding-left: 2rem;

    li::after {
        content: "|";
        padding: 0 0.25rem;
    }

    li:last-of-type::after {
        content: none;
    }

    a {
        color: var(--color-neutral-20);
        font-size: .875rem;
    }

    a:hover {
        color: var(--color-primary-40);
    }

    a:active {
        color: black;
    }
}

@media screen and (min-width: 1280px) {
    .gc-footer {
        padding: 1rem;
    }
}

/* Cards */

.card {
    background-color: white;
    border-radius: var(--border-radius-md);
    overflow: hidden;
}

.card-title {
    color: var(--color-primary-40);
    font-size: 1.25rem;
    padding: .25rem .5rem 0 .5rem;
}

.card-body {
    padding: 0 .5rem .5rem .5rem;
}

.card.strong {
    .card-header {
        background-color: var(--color-primary-40);
    }

    .card-title {
        color: white;
        padding: .25rem .5rem;
    }

    .card-body {
        padding: .5rem;
    }
}

/* *** Homepage *** */

.gc-homepage {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: .5rem;
}

.tutorial-contents {
    background-color: white;
    border-radius: var(--border-radius-md);
    box-shadow: var(--drop-shadow-bottom-right);
    margin-top: .25rem;
    padding: .5rem;
}

@media screen and (min-width: 768px) {
    .gc-homepage {
        display: grid;
        gap: 2rem;
        grid-template-columns: 4fr 8fr;
        padding: 1rem;
    }

    .tutorial-contents {
        align-self: start;
    }
}

@media screen and (min-width: 1280px) {
    .gc-homepage {
        grid-template-columns: 4fr 8fr 4fr;
    }
}

@media screen and (min-width: 1920px) {
    .gc-homepage {
        grid-template-columns: 3fr 2fr 6fr 5fr;
    }

    .tutorial-feed {
        grid-column: 3 / 4;
    }
}

/* *** Tutorial Page */

.gc-tutorial {
    padding: .5rem
}

.tutorial-contents {
    margin-bottom: 1rem;
}

.tutorial-sidebar {
    background-color: var(--color-neutral-90);
    border-radius: var(--border-radius-md);
    margin-bottom: 1rem;
    padding: .5rem;
}

@media screen and (min-width: 768px) {
    .gc-tutorial {
        padding: 1rem;
    }

    .tutorial {
        display: grid;
        gap: 2rem;
        grid-template-columns: 4fr 8fr;
        margin-top: 1rem;
    }

    .tutorial-date {
        font-size: 1rem;
    }

    .tutorial-title {
        font-size: 4rem;
        line-height: 1;
    }

    .tutorial-subtitle {
        font-size: 2rem;
        font-weight: 600;
    }
}

@media screen and (min-width: 1280px) {
    .tutorial {
        grid-template-columns: 4fr 8fr 4fr;
    }
}

@media screen and (min-width: 1920px) {
    .tutorial {
        grid-template-columns: 3fr 2fr 6fr 5fr;
    }

    .tutorial-article {
        grid-column: 3 / 4;
    }

    .tutorial-date {
        font-size: 1.25rem;
    }

    .tutorial-title {
        font-size: 5rem;
        line-height: 1;
    }

    .tutorial-subtitle {
        font-size: 2.5rem;
        font-weight: 600;
    }
}

/* *** Generic Pages (Contact, Privacy, etc) ***/

.gc-page {
    padding: .5rem;
}

.row {
    margin-bottom: .25rem;
}

.row-lg {
    margin-bottom: 1rem;
}

.captcha {
    border: 1px solid var(--color-neutral-50);
    border-radius: var(--border-radius-sm);
    height: 40px;
    width: 120px;
}

.captcha-row {
    align-items: center;
    display: flex;
    gap: .25rem;
}

img.error,
input.error,
textarea.error {
    border: 1px solid red;
}

p.error {
    color: red;
}

@media screen and (min-width: 768px) {
    .gc-page {
        display: grid;
        grid-template-columns: 4fr 8fr 4fr;
        padding: 1rem;
    }

    .page-contents {
        grid-column: 2 / 3;
    }
}

@media screen and (min-width: 1280px) {
    .gc-page {
        grid-template-columns: 5fr 6fr 5fr;
    }
}

/* *** Utility Classes *** */

.sr-only {
    border: 0;
    clip: rect(0, 0, 0, 0);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    white-space: nowrap;
    width: 1px;
}

.image-link {
    line-height: 0;
    text-decoration: none;
}

.heading-link {
    color: var(--color-neutral-10);
    text-decoration: none;
}

.heading-link:hover {
    color: var(--color-primary-40);
    text-decoration: underline;
}

.heading-link:active {
    color: var(--color-primary-10);
}