:root {
  --bg: #f7f6f2;
  --card: #ffffff;
  --text: #1f2328;
  --muted: #5d6470;
  --accent: #2c6e49;
  --border: #e2dfd6;
  --code: #f0eee8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --card: #1d2024;
    --text: #e6e6e3;
    --muted: #9aa1ab;
    --accent: #6cc28f;
    --border: #2d3137;
    --code: #262a30;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
header, main, footer { max-width: 44rem; margin: 0 auto; padding: 0 16px; }
header { display: flex; align-items: baseline; justify-content: space-between; padding-top: 2rem; }
header a.brand { font-weight: 700; color: var(--text); text-decoration: none; font-size: 1.1rem; }
nav a { color: var(--muted); margin-left: 1rem; text-decoration: none; font-size: .95rem; }
nav a:hover, nav a[aria-current] { color: var(--accent); }
main {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-top: 1.25rem;
  padding: 1.5rem 1.75rem 1.75rem;
}
h1 { font-size: 1.6rem; line-height: 1.25; margin: .25rem 0 1rem; }
h2 { font-size: 1.1rem; margin: 1.75rem 0 .5rem; }
p, li { color: var(--text); }
.muted, footer { color: var(--muted); }
.notice {
  border-left: 4px solid var(--accent);
  background: var(--code);
  padding: .75rem 1rem;
  border-radius: 6px;
  margin: 1rem 0;
}
a { color: var(--accent); }
code, textarea { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9rem; }
code { background: var(--code); padding: .1em .35em; border-radius: 4px; }
textarea {
  width: 100%;
  min-height: 7rem;
  padding: .75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--code);
  color: var(--text);
  word-break: break-all;
  resize: vertical;
}
button {
  font: inherit;
  margin-top: .75rem;
  padding: .5rem 1.1rem;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
.error { color: #c0392b; }
footer { font-size: .85rem; padding-top: 1rem; padding-bottom: 2rem; }
@media (max-width: 520px) {
  header { flex-direction: column; }
  nav a { margin: 0 1rem 0 0; }
  main { margin: 1.25rem 16px 0; padding: 1.25rem 1rem; }
}