:root {
    color-scheme: light dark;
    --ink: #1b1f24;
    --paper: #ffffff;
    --muted: #5b6572;
    --accent: #2f6feb;
    --border: #e2e6ea;
}

@media (prefers-color-scheme: dark) {
    :root {
        --ink: #e6e9ec;
        --paper: #14171a;
        --muted: #9aa4af;
        --accent: #6ea8fe;
        --border: #2a2f34;
    }
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    max-width: 100%;
    overflow-x: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--ink);
    background: var(--paper);
    line-height: 1.55;
}

.page-header, main, footer {
    max-width: 40rem;
    margin: 0 auto;
    padding: 1.5rem 1.25rem;
}

.page-header h1 {
    margin-bottom: 0.25rem;
}

.tagline {
    color: var(--muted);
    margin-top: 0;
}

section {
    margin-bottom: 2rem;
}

section h2 {
    font-size: 1.15rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.35rem;
}

a {
    color: var(--accent);
}

footer {
    color: var(--muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
}