:root {
    --color-bg: #0b1220;
    --color-surface: #111a2b;
    --color-text: #f4f7fb;
    --color-text-muted: #a9b4c7;

    --color-primary: #2f80ed;
    --color-primary-hover: #5aa0ff;

    --color-border: #26324a;

    --radius-sm: 0.5rem;
    --radius-md: 1rem;

    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;

    --content-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;

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

    font-family:
        Inter,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;

    line-height: 1.6;
}

a {
    color: inherit;
}

img {
    display: block;
    max-width: 100%;
}

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

:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 4px;
}

.about,
.contact,
.site-footer {
    width: min(100% - 2rem, var(--content-width));
    margin-inline: auto;
}

.about,
.contact {
    padding-block: var(--space-xl);
}

.site-footer {
    padding-block: 2rem;

    color: var(--color-text-muted);
}

.contact {
    padding-block: var(--space-xl);

    text-align: center;
}

.contact h2 {
    margin-bottom: 0.75rem;

    font-size: clamp(2rem, 4vw, 3rem);
}

.contact p {
    margin-bottom: 2rem;

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

    font-size: 1.15rem;
}

.contact a {
    display: inline-block;

    padding: 0.9rem 1.4rem;

    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);

    text-decoration: none;

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

.contact a:hover {
    border-color: var(--color-primary);

    background: var(--color-surface);
}