/* Include padding and borders in element widths. */
* {
    box-sizing: border-box;
}

/* Colours used throughout the website. */
:root {
    --background: #101827;
    --card: #1b293e;
    --text: #edf2f7;
    --muted: #b6c2d4;
    --accent: #80dfc4;
    --border: #34445c;
}

/* Overall page appearance. */
body {
    margin: 0 auto;
    max-width: 900px;
    padding: 40px 24px;

    background-color: var(--background);
    color: var(--text);

    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    overflow-wrap: break-word;
}

/* Introduction at the top of the page. */
header {
    padding: 40px 0 30px;
}

header > p:first-child {
    color: var(--accent);
    font-size: 12px;
    font-weight: bold;
    letter-spacing: 2px;
}

h1 {
    margin: 12px 0;
    font-size: clamp(36px, 7vw, 64px);
    line-height: 1.15;
}

header > p {
    max-width: 600px;
    color: var(--muted);
}

/* Navigation menu. */
nav {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 28px;
}

nav a {
    display: inline-block;
    padding: 10px 16px;

    border: 1px solid var(--border);
    border-radius: 10px;

    color: var(--text);
    text-decoration: none;

    transition:
        background-color 0.2s,
        color 0.2s,
        border-color 0.2s;
}

nav a:hover {
    background-color: var(--accent);
    border-color: var(--accent);
    color: var(--background);
}

/* Visible outline for keyboard navigation. */
a:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 5px;
}

/* Main content cards. */
section {
    margin-bottom: 24px;
    padding: 28px;

    background-color: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;

    scroll-margin-top: 24px;
}

h2 {
    margin: 0 0 16px;
    color: var(--accent);
    font-size: 26px;
    line-height: 1.3;
}

h3 {
    margin: 0 0 12px;
    font-size: 20px;
    line-height: 1.4;
}

p {
    margin: 0 0 16px;
}

section > p:last-child,
article > p:last-child {
    margin-bottom: 0;
}

/* Interests list. */
ul {
    margin: 0;
    padding-left: 24px;
}

li {
    padding-left: 4px;
    margin-bottom: 10px;
}

li:last-child {
    margin-bottom: 0;
}

li::marker {
    color: var(--accent);
}

/* Project details inside the projects section. */
article {
    padding-left: 18px;
    border-left: 3px solid var(--accent);
}

article p {
    color: var(--muted);
}

strong {
    color: var(--text);
}

/* Footer and ordinary links. */
footer {
    padding: 20px 0;
    color: var(--muted);
    text-align: center;
    font-size: 14px;
}

footer p {
    margin-bottom: 8px;
}

a {
    color: var(--accent);
    text-underline-offset: 4px;
}

a:hover {
    text-decoration: none;
}

/* Adjust spacing on smaller screens. */
@media (max-width: 600px) {
    body {
        padding: 24px 16px;
    }

    header {
        padding-top: 20px;
    }

    section {
        padding: 22px 18px;
    }

    nav {
        gap: 10px;
    }

    nav a {
        padding: 8px 12px;
    }
}/