:root {
    --bg: #ffffff;
    --fg: #222222;
    --muted: #5d738d;
    --border: #ecf0f1;
    --btn-hover-bg: #222222;
    --btn-hover-fg: #ffffff;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #121212;
        --fg: #f5f5f5;
        --muted: #9aa0a6;
        --border: #2a2a2a;
        --btn-hover-bg: #f5f5f5;
        --btn-hover-fg: #121212;
    }
}

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

html, body { height: 100%; }

body {
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--fg);
    background: var(--bg);
}

.home {
    flex: 1 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.home-title {
    margin: 0;
    text-align: center;
    font-size: clamp(2rem, 6vw, 4rem);
    font-weight: 600;
    letter-spacing: 0.02em;
}

.site-footer {
    flex: 0 0 auto;
    padding: 1.5rem 1.5rem 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    border-top: 1px solid var(--border);
}

.site-footer__links {
    display: flex;
    gap: 0.75rem;
}

.footer-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border);
    color: var(--muted);
    transition: color .2s, background-color .2s, border-color .2s;
}

.footer-btn:hover {
    color: var(--btn-hover-fg);
    background-color: var(--btn-hover-bg);
    border-color: var(--btn-hover-bg);
}

.footer-btn svg { width: 20px; height: 20px; }

.site-footer__copy {
    margin: 0;
    font-size: 0.875rem;
    color: var(--muted);
}

.kg-width-wide { width: auto; max-width: 75vw; }
.kg-width-full { width: 100vw; max-width: 100vw; margin-left: calc(50% - 50vw); }