:root {
    color-scheme: light dark;

    --background-color: #ffffff;
    --text-color: #222222;
    --surface-color: #f4f4f4;
    --border-color: #cccccc;
    --link-color: #2457a6;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
}

header,
main,
footer {
    width: min(90%, 70rem);
    margin-inline: auto;
}

header {
    padding-block: 1.5rem;
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

nav a {
    color: var(--link-color);
}

main {
    min-height: 60vh;
    padding-block: 2rem;
}

section {
    margin-block: 2rem;
}

button,
input,
textarea,
select {
    font: inherit;
}

button {
    padding: 0.5rem 1rem;
    cursor: pointer;
}

footer {
    padding-block: 2rem;
    border-top: 1px solid var(--border-color);
}

@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #181818;
        --text-color: #f1f1f1;
        --surface-color: #262626;
        --border-color: #555555;
        --link-color: #9fc3ff;
    }
}

    :root[data-theme="light"] {
    color-scheme: light;

    --background-color: #ffffff;
    --text-color: #222222;
    --surface-color: #f4f4f4;
    --border-color: #cccccc;
    --link-color: #2457a6;
}

:root[data-theme="dark"] {
    color-scheme: dark;

    --background-color: #181818;
    --text-color: #f1f1f1;
    --surface-color: #262626;
    --border-color: #555555;
    --link-color: #9fc3ff;
}

.theme-picker {
    margin-top: 1rem;
}

.theme-picker select {
    padding: 0.4rem;
}

project-card {
    display: block;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1.25rem;
}

project-card h3 {
    margin-top: 0;
}