:root {
    --text: hsl(0, 0%, 100%);
    --muted: hsl(0, 0%, 79%);
    --decoration: hsl(0, 0%, 22%);
    --secondary: hsl(0, 0%, 15%);
    --background: hsl(0, 0%, 9%);
    --primary: hsl(0, 100%, 58%);
    --accent: hsl(0, 100%, 63%);

    --decoration-thickness: 1px;
    --border: var(--decoration-thickness) solid var(--decoration);
    --font-scale: 1.2;
    --p: 1rem;
    --h5: calc(var(--p) * var(--font-scale));
    --h4: calc(var(--h5) * var(--font-scale));
    --h3: calc(var(--h4) * var(--font-scale));
    --h2: calc(var(--h3) * var(--font-scale));
    --h1: calc(var(--h2) * var(--font-scale));
    --small: calc(var(--p) / var(--font-scale));
}

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

html {
    height: 100%;
}

body {
    position: relative;
    display: flex;
    flex-direction: column;
    height: 100%;
    color-scheme: dark;
    background-color: var(--background);
    color: var(--text);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

h1 {
    margin-bottom: 0.4rem;
    font-size: var(--h1);
    font-weight: 800;
}

h2 {
    margin-bottom: 0.4rem;
    font-size: var(--h2);
    font-weight: 700;
}

h3 {
    margin-bottom: 0.4rem;
    font-size: var(--h3);
    font-weight: 600;
}

h4 {
    margin-bottom: 0.4rem;
    font-size: var(--h4);
    font-weight: 500;
}

h5 {
    margin-bottom: 0.4rem;
    font-size: var(--h5);
    font-weight: 400;
}

p {
    padding: 1.4rem 0.2rem 2.2rem 0.2rem;
    font-size: var(--p);
    line-height: 1.4em;
    text-align: justify;
    word-wrap: break-word;
    hyphens: auto;
    font-weight: 300;
}

i {
    color: transparent;
    font-weight: 800;
    -webkit-text-stroke-color: var(--text);
    -webkit-text-stroke-width: var(--decoration-thickness);
}

b {
    color: var(--primary);
    font-weight: 800;
}

a {
    color: var(--primary);
    transition: 75ms linear all;

    &:hover,
    &:focus-visible {
        background-color: var(--secondary);
        outline: none;
        outline-offset: 0;
    }

    &.action {
        border-radius: 9999rem;
        text-decoration: none;

        &.chip {
            padding: 0 0.3rem;
            outline: 0.4rem solid transparent;

            &:hover,
            &:focus-visible {
                outline: 0.4rem solid var(--secondary);
            }
        }
    }
}

svg {
    fill: currentColor;

    &.icon {
        width: 1em;
    }
}

button {
    font-size: 1em;
    padding: 0.3em 1.8em;
    margin: 0.4em 0.2em;
    color: var(--text);
    background-color: var(--secondary);
    border: var(--border);
    border-radius: 999rem;
    cursor: pointer;
    transition: 75ms linear all;

    &:disabled {
        color: var(--muted);
        background-color: var(--background);
        cursor: not-allowed;
    }

    &:not(:disabled) {
        &:hover,
        &:focus-visible {
            background-color: var(--primary);
            outline: none;
        }

        &:active {
            background-color: var(--accent);
        }
    }
}

input[type='number'] {
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    margin: 0.4em 0.2em;
    padding: 0.2em 0.4em;
    color: var(--text);
    background-color: var(--secondary);
    border: var(--border);
    border-radius: 0.5em;
    font-size: 1em;
    line-height: 1.4em;
    font-weight: 300;
    transition: 75ms linear all;

    &:hover {
        border-color: var(--muted);
    }

    &:focus-visible {
        outline: none;
        border-color: var(--primary);
    }
}

input[type='text'] {
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    padding: 0.2em 0.4em;
    color: var(--text);
    background-color: var(--secondary);
    border: var(--border);
    border-radius: 0.5em;
    font-size: 1em;
    line-height: 1.4em;
    font-weight: 300;
    transition: 75ms linear all;

    &:hover {
        border-color: var(--muted);
    }

    &:focus-visible {
        outline: none;
        border-color: var(--primary);
    }
}

input[type='range'] {
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    height: 0.4rem;
    margin: 0.5rem 0;
    background-color: var(--secondary);
    border: var(--border);
    border-radius: 0.2rem;
    cursor: pointer;

    &::-webkit-slider-thumb {
        appearance: none;
        -webkit-appearance: none;
        width: 1.4rem;
        height: 1.4rem;
        background-color: var(--secondary);
        border-radius: 50%;
        border: var(--border);
        cursor: pointer;
        transition: 75ms linear all;
    }

    &::-moz-range-thumb {
        width: 1.4rem;
        height: 1.4rem;
        background-color: var(--secondary);
        border-radius: 50%;
        border: var(--border);
        cursor: pointer;
        transition: 75ms linear all;
    }

    &:hover,
    &:focus-visible {
        outline: none;

        &::-moz-range-thumb {
            background-color: var(--primary);
        }
    }

    &:active {
        &::-moz-range-thumb {
            background-color: var(--accent);
        }
    }

    &:disabled {
        cursor: not-allowed;
        background-color: var(--background);

        &::-moz-range-thumb {
            cursor: not-allowed;
            background-color: var(--background);
        }
    }
}

input[type='range']:hover::-webkit-slider-thumb,
input[type='range']:focus-visible::-webkit-slider-thumb {
    background-color: var(--primary);
}

input[type='range']:active::-webkit-slider-thumb {
    background-color: var(--accent);
}

input[type='range']:disabled::-moz-range-thumb {
    cursor: not-allowed;
    background-color: var(--background);
}

header {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 5000;
}

nav {
    display: flex;
    padding: 0.8rem 2.4rem;
    gap: 1rem;
    align-items: center;
    background-color: var(--background);
    border-bottom: var(--border);
    font-weight: bold;
    text-transform: uppercase;

    .links {
        position: absolute;
        left: 0;
        right: 0;
        bottom: 0;
        padding: 1rem;
        background-color: var(--background);
        border-bottom: var(--border);
        z-index: -10;
        transition: 250ms ease-in-out transform;
    }


    .profile {
        display: flex;
        margin-left: auto;
        align-items: center;
        gap: 0.4rem;
        color: var(--muted);
        border: var(--border);
        transition: 75ms linear all;

        img {
            height: 2rem;
            border-radius: 50%;
        }

        span {
            display: none;
            margin-right: 0.8rem;
        }
    }

    .hamburger {
        display: flex;
        width: 3rem;
        height: 3rem;
        margin: 0;
        padding: 0;
        justify-content: center;
        align-items: center;
        background-color: var(--background);
        color: var(--text);
        font-size: 1.8rem;

        path {
            transform-origin: center;
            transition: 200ms ease-in-out all;
        }

        &:hover,
        &:focus-visible {
            background-color: var(--secondary);
        }
    }


    &.expanded {
        ul {
            transform: translateY(100%);
        }

        path:nth-child(1) {
            transform: rotate(45deg) translateY(25%);
        }

        path:nth-child(2) {
            transform: scaleX(0%);
        }

        path:nth-child(3) {
            transform: rotate(-45deg) translateY(-25%);
        }
    }
}

main {
    display: flex;
    flex-direction: column;
    width: 75%;
    max-width: 72rem;
    margin: 3.5rem auto 5rem auto;
    gap: 3.5rem;
}

footer {
    display: flex;
    margin-top: auto;
    padding: 5rem 18% 2rem 18%;
    gap: 2rem;
    border-top: var(--border);

    .about {
        display: flex;
        flex-direction: column;
        max-width: 50%;
        gap: 0.6rem;
        color: var(--muted);

        .branding {
            margin-bottom: 1rem;
        }

        .platforms {
            display: flex;
            gap: 1rem;
            font-size: 1.8rem;

            a {
                padding: 0;
                color: var(--muted);
                background: none;

                &:hover {
                    color: var(--text);
                }

                svg {
                    fill: currentColor;
                    width: 1em;
                    height: 1em;
                }
            }
        }
        .copyright {
            padding-top: 2rem;
        }
    }
    .links {
        flex-direction: column;
    }
}

.branding {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-right: 1rem;
    font-size: var(--h5);
    font-weight: bold;
    text-decoration: none;
    text-transform: uppercase;
    color: var(--text);
    transition: 75ms linear color;

    img {
        width: 2.5rem;
        height: 2.5rem;
        border-radius: 50%;
    }
}

.links {
    display: flex;
    flex-grow: 1;
    justify-content: space-evenly;
    align-items: center;
    list-style: none;
    font-weight: bold;
    text-transform: uppercase;
}

.grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: 1.5rem;

    > * {
        display: flex;
        flex-direction: column;
        padding: 1.5rem;
        border-radius: 1.5rem;
        border: var(--border);

        p {
            flex-grow: 1;
            padding-bottom: 1.8rem;
        }

        a {
            align-self: start;
        }
    }
}

::selection {
    background: var(--decoration);
}

@media (min-width: 30rem) {
    :root {
        --font-scale: 1.25;
    }
}

@media (min-width: 40rem) {
    :root {
        --font-scale: 1.333;
    }

    nav {
        .profile {
            span {
                display: block;
            }
        }
    }
}

@media (min-width: 50rem) {
    nav {
        .links {
            position: relative;
            z-index: 0;
            border: none;
            transition: none;
        }

        .hamburger {
            display: none;
        }


        &.expanded {
            ul {
                transform: translateY(0);
            }
        }
    }

    .grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 70rem) {
    .text {
        column-count: 2;
        column-gap: 1.7rem;
    }

    footer {
        .links {
            flex-direction: row;
        }
    }
}