:root {
  color-scheme: light dark;
  --bg: #f4f1ea;
  --ink: #1b1916;
  --muted: #5e584e;
  --line: #ddd4c4;
  --paper: #fffdf8;
  --accent: #0e3f4c;
  --focus: #0b6e99;
  --error: #8d1d18;
  --warn: #8a4b08;
  --ok: #0d5c3d;
  --error-bg: #fdeceb;
  --warn-bg: #fff4e5;
  --ok-bg: #e7f6ef;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141311;
    --ink: #f4efe6;
    --muted: #c4b8a6;
    --line: #3c352c;
    --paper: #211e1a;
    --accent: #9fd7e4;
    --focus: #9ad7ff;
    --error: #ffb4ab;
    --warn: #ffd0a1;
    --ok: #8ad7b5;
    --error-bg: #3a201e;
    --warn-bg: #3a2c18;
    --ok-bg: #163028;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font: 1.05rem/1.5 system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

a { color: var(--accent); }
a:hover { text-decoration: none; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.skip {
  position: absolute;
  left: 0.5rem;
  top: -4rem;
  background: var(--paper);
  padding: 0.4rem 0.6rem;
}

.skip:focus { top: 0.5rem; }

.wrap { max-width: 42rem; margin: 0 auto; padding: 0 1rem; }

.top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem 1rem;
  padding-top: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
}

.brand { font-weight: 700; margin: 0; }
.brand a { color: inherit; text-decoration: none; }

nav { display: flex; gap: 1rem; }
nav a[aria-current="page"] { font-weight: 700; text-decoration: none; }

main { padding-top: 1.25rem; padding-bottom: 2rem; }

h1 { font-size: 1.8rem; line-height: 1.2; margin: 0 0 0.5rem; }
h2 { font-size: 1.25rem; margin: 1.75rem 0 0.5rem; }
h3 { font-size: 1.05rem; margin: 1.1rem 0 0.25rem; }

.lede { font-size: 1.1rem; margin-top: 0; }

form, .result, .verdict, .reminder {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
  margin: 1rem 0;
}

label { display: block; font-weight: 650; margin-top: 0.8rem; }
.req { font-weight: 500; color: var(--muted); }

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

input, textarea {
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.5rem 0.6rem;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
}

textarea { min-height: 6rem; resize: vertical; }

.hint, .note, footer, .scope { color: var(--muted); }
.hint { margin: 0.2rem 0 0; }
.error { color: var(--error); margin: 0.3rem 0 0; }

.summary {
  border: 2px solid var(--error);
  background: var(--error-bg);
  padding: 0.6rem 0.8rem;
  border-radius: 6px;
}

.actions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }

button {
  background: var(--accent);
  color: var(--bg);
  border: 0;
  border-radius: 6px;
  padding: 0.55rem 0.8rem;
  cursor: pointer;
}

@media (prefers-color-scheme: dark) {
  button { color: #10262c; }
}

.verdict { border-width: 2px; }
.verdict-fail { border-color: var(--error); background: var(--error-bg); }
.verdict-warn { border-color: var(--warn); background: var(--warn-bg); }
.verdict-pass { border-color: var(--ok); background: var(--ok-bg); }
.verdict-word { font-size: 1.4rem; font-weight: 750; margin: 0; }

pre, code { font-family: ui-monospace, monospace; }
pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  background: var(--bg);
  padding: 0.8rem;
  border-radius: 6px;
}

table { width: 100%; border-collapse: collapse; margin: 0.5rem 0 1rem; }
th, td {
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  padding: 0.4rem 0.35rem;
}

.source { list-style: none; padding: 0; margin: 0; }
.source li {
  display: grid;
  grid-template-columns: 2.5rem auto 1fr;
  gap: 0.4rem;
  padding: 0.15rem 0;
  border-bottom: 1px solid var(--line);
}
.source code { white-space: pre-wrap; overflow-wrap: anywhere; }
.ln { color: var(--muted); font-variant-numeric: tabular-nums; }
.marker { font-weight: 700; }
.has-error { background: var(--error-bg); }
.has-warning { background: var(--warn-bg); }

.hp {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

footer { padding-bottom: 2rem; font-size: 0.95rem; }