:root {
    --fg: #0f1115;
    --muted: #5b6473;
    --bg: #fafbfc;
    --card: #fff;
    --border: #e5e7eb;
    --accent: #0057d8;
    --ok: #0a8754;
    --bad: #b4231e;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font: 16px/1.5 system-ui, -apple-system, Segoe UI, sans-serif;
    color: var(--fg);
    background: var(--bg);
}
main.narrow { max-width: 640px; margin: 2rem auto; padding: 0 1rem; }
h1 { font-size: 1.75rem; margin-bottom: .25rem; }
h2 { font-size: 1.25rem; margin-top: 1.5rem; }
.lead { color: var(--muted); margin-bottom: 2rem; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.big { font-size: 2rem; font-weight: 600; }
form label {
    display: block;
    margin-bottom: 1rem;
    font-weight: 500;
}
form input[type=text], form input[type=email], form input:not([type]) {
    display: block;
    width: 100%;
    padding: .6rem .75rem;
    margin-top: .25rem;
    font: inherit;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--card);
}
form .check {
    display: flex;
    gap: .5rem;
    align-items: flex-start;
    font-weight: 400;
    margin-bottom: .75rem;
}
form .check input { margin-top: .25rem; }
button {
    padding: .6rem 1.25rem;
    font: inherit;
    font-weight: 600;
    background: var(--accent);
    color: #fff;
    border: 0;
    border-radius: 6px;
    cursor: pointer;
}
button:hover { filter: brightness(1.08); }
.err {
    background: #fdecea;
    color: var(--bad);
    padding: .75rem 1rem;
    border-radius: 6px;
    margin: 1rem 0;
}
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem 1.25rem;
    margin: 1rem 0;
}
.card.ok { border-color: var(--ok); }
.card.bad { border-color: var(--bad); }
.card.ok h2 { color: var(--ok); }
.card.bad h2 { color: var(--bad); }
pre.code, .code {
    display: inline-block;
    background: #f1f3f5;
    padding: .4rem .6rem;
    border-radius: 4px;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 1.05rem;
    letter-spacing: 1px;
    user-select: all;
}
.dash {
    display: inline-block;
    word-break: break-all;
    font-family: ui-monospace, monospace;
    font-size: .9rem;
}
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: left; padding: .5rem .6rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 500; }
dl { display: grid; grid-template-columns: max-content 1fr; gap: .4rem 1rem; margin: 0; }
dt { color: var(--muted); }
dd { margin: 0; }
a { color: var(--accent); }