:root {
    --bg: #fbf7f0;
    --ink: #1c1917;
    --ink-soft: #57534e;
    --ink-faint: #a8a29e;
    --accent: #7c2d12;
    --rule: #e7e5e4;
    --max: 680px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;
    font-size: 17px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

main {
    max-width: var(--max);
    margin: 0 auto;
    padding: 64px 24px 96px;
}

header.site {
    padding: 24px;
    border-bottom: 1px solid var(--rule);
}

header.site .inner {
    max-width: var(--max);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

header.site a {
    color: var(--ink);
    text-decoration: none;
    font-family: "Iowan Old Style", "Charter", Georgia, serif;
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

header.site nav a {
    font-family: inherit;
    font-size: 14px;
    font-weight: 400;
    color: var(--ink-soft);
    margin-left: 24px;
}

header.site nav a:hover {
    color: var(--accent);
}

h1 {
    font-family: "Iowan Old Style", "Charter", Georgia, serif;
    font-size: 56px;
    line-height: 1.05;
    letter-spacing: -0.02em;
    font-weight: 600;
    margin: 0 0 24px;
}

h2 {
    font-family: "Iowan Old Style", "Charter", Georgia, serif;
    font-size: 28px;
    line-height: 1.2;
    letter-spacing: -0.015em;
    font-weight: 600;
    margin: 64px 0 16px;
}

h3 {
    font-size: 17px;
    font-weight: 600;
    margin: 32px 0 8px;
}

p {
    margin: 0 0 16px;
    color: var(--ink-soft);
}

p.lead {
    font-size: 22px;
    line-height: 1.45;
    color: var(--ink);
    margin-bottom: 32px;
}

a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

a:hover { text-decoration-thickness: 2px; }

.badge {
    display: inline-block;
    padding: 4px 10px;
    border: 1px solid var(--rule);
    border-radius: 999px;
    font-size: 13px;
    color: var(--ink-soft);
    margin-bottom: 32px;
    background: white;
}

.demo {
    margin: 40px 0 48px;
    padding: 32px;
    background: white;
    border: 1px solid var(--rule);
    border-radius: 4px;
    font-family: "Iowan Old Style", "Charter", Georgia, serif;
    font-size: 19px;
    line-height: 1.7;
    color: var(--ink);
}

.demo .known { /* p >= 0.85: plain */ }

.demo .almost {
    border-bottom: 1px dotted var(--ink-faint);
    padding-bottom: 1px;
}

.demo .learning {
    color: var(--ink-faint);
    font-style: italic;
}

.demo .new {
    color: var(--ink-soft);
    font-style: italic;
}

.demo .caption {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--rule);
    font-family: -apple-system, system-ui, sans-serif;
    font-size: 13px;
    color: var(--ink-faint);
    line-height: 1.5;
}

ul {
    color: var(--ink-soft);
    padding-left: 20px;
}

ul li { margin-bottom: 6px; }

.tiers {
    list-style: none;
    padding: 0;
    margin: 0 0 24px;
}

.tiers li {
    display: flex;
    align-items: baseline;
    gap: 16px;
    padding: 8px 0;
    border-bottom: 1px solid var(--rule);
    font-size: 16px;
}

.tiers li:last-child { border-bottom: none; }

.tiers .sample {
    font-family: "Iowan Old Style", "Charter", Georgia, serif;
    font-size: 18px;
    min-width: 120px;
    color: var(--ink);
}

footer {
    max-width: var(--max);
    margin: 0 auto;
    padding: 32px 24px 48px;
    border-top: 1px solid var(--rule);
    font-size: 13px;
    color: var(--ink-faint);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

footer a {
    color: var(--ink-soft);
    text-decoration: none;
    margin-right: 16px;
}

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

.muted { color: var(--ink-faint); font-size: 14px; }

dl.policy dt {
    font-weight: 600;
    color: var(--ink);
    margin-top: 24px;
}

dl.policy dd {
    margin: 4px 0 0;
    color: var(--ink-soft);
}

@media (max-width: 600px) {
    h1 { font-size: 40px; }
    p.lead { font-size: 19px; }
    main { padding: 40px 20px 64px; }
    .demo { padding: 24px; font-size: 17px; }
}