:root {
  --ink: #12141a;
  --muted: #5c6370;
  --bg: #f7f6f2;
  --card: #fff;
  --line: #e4e1d8;
  --accent: #1f4d3a;
  --warn: #8a3b12;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}
a { color: var(--accent); }
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 1.25rem; }
header { display: flex; justify-content: space-between; align-items: baseline; padding-top: 1.25rem; }
header .brand { font-weight: 700; text-decoration: none; color: var(--ink); }
nav a { margin-left: 1rem; font-size: 0.9rem; }
h1 { font-size: 1.75rem; letter-spacing: -0.02em; margin: 1.5rem 0 0.5rem; }
.lede { font-size: 1.1rem; color: var(--muted); margin-bottom: 1.5rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.25rem;
  margin: 1rem 0;
}
label { display: block; font-weight: 600; margin: 0.75rem 0 0.25rem; }
input[type="file"] { width: 100%; }
button, .btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 8px;
  padding: 0.7rem 1.1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}
button.secondary, .btn.secondary { background: #fff; color: var(--accent); border: 1px solid var(--accent); }
.sentence { font-size: 1.05rem; padding: 0.75rem; background: #eef4f0; border-radius: 8px; }
.muted { color: var(--muted); font-size: 0.9rem; }
.error { color: var(--warn); font-weight: 600; }
.grid { display: grid; gap: 0.75rem; }
@media (min-width: 640px) { .grid.two { grid-template-columns: 1fr 1fr; } }
ul.plain { padding-left: 1.1rem; }
footer { padding: 2.5rem 1.25rem; color: var(--muted); font-size: 0.85rem; }
.badge { font-size: 0.75rem; background: #eef4f0; padding: 0.15rem 0.45rem; border-radius: 999px; }
.lock { color: var(--warn); }
pre.out { white-space: pre-wrap; background: #f3f1ea; padding: 1rem; border-radius: 8px; overflow: auto; }
.prose p { margin: 0.75rem 0; }
.prose h2 { font-size: 1.2rem; margin: 1.75rem 0 0.5rem; }
.prose code { font-size: 0.9em; background: #f3f1ea; padding: 0.1rem 0.3rem; border-radius: 4px; }
ol.steps { padding-left: 1.25rem; }
ol.steps li { margin: 0.55rem 0; }
.faq details { border-top: 1px solid var(--line); padding: 0.7rem 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { font-weight: 600; cursor: pointer; }
.faq details p { margin: 0.5rem 0 0; }