:root {
    --bg-main: #5f6986;
    --bg-dark-accent: #4c597a;
    --bg-light-accent: #7480a8;
    --fg-color: #eee;
    --fg-accent: #fff;
    --light-red: #f09999;
    --light-yellow: #f0f099;
    --light-green: #99f099;
    --light-cyan: #99f0f0;
    --spacer: 4px;
}

.light-red {
    color: var(--light-red);
}

.light-yellow {
    color: var(--light-yellow);
}

.light-green {
    color: var(--light-green);
}

.light-cyan {
    color: var(--light-cyan);
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-main);
    color: var(--fg-color);
    
    font-family: "Roboto", sans-serif;
}

body{
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr auto;
    min-height: 100vh;
    width: 100%;
    opacity: 0;
    transition: opacity 0.5s;
}

a {
    text-decoration: none;
    color: inherit;
}

a:hover {
    cursor: pointer;
}

header {
    background-color: var(--bg-dark-accent);
    position: sticky;
    top: 0px;
}

nav {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    padding-right: 3%;
    padding-left: 3%;
}

nav ul {
    display: flex;
    flex-direction: row;
    gap: var(--spacer);
    list-style: none;
    padding-inline-start: 0;
}

nav ul li {
    padding: 0;
    transition: transform 0.15s ease;
}

nav ul li:hover {
    transform: translateY(-1px);
}

nav a {
    padding: var(--spacer);
    font-size: 16px;
}

nav a.active {
    font-weight: bold;
    
}

nav a img {
    object-fit: cover;
}

main {
    display: grid;
    grid-template-columns: 3fr 2fr;
    grid-template-rows: min-content;
    align-content: start;
    gap: calc(4*var(--spacer));
}

aside.left-side {
    display: contents;
}

section {
    display: flex;
    flex-direction: column;
    padding: calc(5*var(--spacer));
    gap: calc(2*var(--spacer));
    width: 100%;
}

section h2 {
    margin: 0;
    text-align: center;

    width: 100%;
    background-color: var(--bg-dark-accent);
    border-radius: calc(3*var(--spacer));
    padding: calc(2*var(--spacer));

    font-size: 24px;
    font-weight: 600;
}

.bio h1 {
    margin: 0;
    padding-top: 20px;
    text-align: center;
    font-family: "Roboto Mono", monospace;
}

.bio p {
    font-size: 16px;
}

section.projects {
    grid-column: 1 / 3;
    align-items: center;
}

.group {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: calc(2*var(--spacer));

    width: 100%;
    background-color: var(--bg-light-accent);
    border-radius: calc(3*var(--spacer));
    padding: calc(2*var(--spacer));
}

.group-header {
    margin: 0;
    padding: 0;
    padding: var(--spacer);
    text-align: center;

    width: 100%;
    border-radius: calc(5*var(--spacer));
    background-color: var(--bg-dark-accent);
}

.group .about {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: calc(2*var(--spacer));
}

.group .descr {
    width: 100%;
    padding-left: calc(3*var(--spacer));
    padding-right: calc(3*var(--spacer));
}

.group .important {
    color: var(--light-yellow);
    padding-top: var(--spacer);
}

.links {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-around;

    width: 20%;
    min-width: 180px;

    margin-top: var(--spacer);
}

.link {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: calc(1.5*var(--spacer));
    transition: transform 0.15s ease;
}

.link:hover {
    transform: scale(1.05);
}

section.skills {
    display: flex;
    flex-direction: column;
    gap: calc(3*var(--spacer));
}

.skill {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    gap: calc(2*var(--spacer));

    border-radius: calc(3*var(--spacer));

    background-color: var(--bg-light-accent);
    font-size: 16px;
    transition: transform 0.15s ease;
}

.skill:hover {
    transform: scale(1.05);
}

.skill .name {
    display: flex;
    align-items: center;


    padding-left: calc(3*var(--spacer));
    border-radius: calc(3*var(--spacer));
}

.skill .exp {
    display: flex;
    align-items: center;
    justify-content: center;

    width: 60px;
    padding: calc(2*var(--spacer));
    margin: var(--spacer);
    border-radius: calc(3*var(--spacer));

    background-color: var(--bg-dark-accent);
    font-family: "Roboto Mono", monospace;
    font-size: 16px;
}

section.contacts {
    grid-column: 1 / 4;
    grid-row: 3 / 4;

    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    
    width: 100%;
    font-size: 16px;
}

.contacts .group {
    padding-top: 0;
    padding-left: 0;
    padding-right: 0;
}

.contacts .group-header {
    margin: 0;
    border-radius: calc(3*var(--spacer)) calc(3*var(--spacer)) 0 0;
}

.contacts .links {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-around;
}

footer {
    display: flex;
    align-items: center;

    width: 100%;
    height: 48px;
    background-color: var(--bg-dark-accent);
}

.copyright {
    display: flex;
    align-items: center;
    justify-content: center;
    
    font-size: 14px;

    width: 100%;
    padding: calc(2*var(--spacer));
}

@media screen and (min-width: 900px) {
    main {
        grid-template-columns: 2fr 3fr 4fr;
    }

    aside.left-side {
        padding-top: 32px;
        display: flex;
        flex-direction: column;

        grid-column: 1 / 2;
        grid-row: 1 / 2;
    }

    section.skills {
        padding-top: 0;
    }

    section.bio {
        grid-column: 2 / 3;
        grid-row: 1 / 2;
        padding-top: 0;
    }

    section.projects {
        grid-column: 3 / 4;
        grid-row: 1 / 3;
        padding-top: 32px;
    }
}

@media screen and (max-width: 600px) {
    main {
        display: flex;
        flex-direction: column;
        gap: calc(2*var(--spacer))
    }

    section.contacts {
        order: 3;
    }
}