:root {
  --bg: #f4f3ef; --card: #ffffff; --fg: #1d1c1a; --muted: #6a6862; --line: #d9d6cf;
  --accent: #b2471c; --accent-fg: #ffffff; --danger: #a12622; --ok: #2c6e3f;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #161513; --card: #211f1c; --fg: #ebe8e1; --muted: #a29e95; --line: #3a3732;
    --accent: #e0703f; --accent-fg: #161513; --danger: #e26a63; --ok: #6cc184; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font: 15px/1.5 system-ui, -apple-system, "Malgun Gothic", "Apple SD Gothic Neo", sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: 1.6rem; margin: 0 0 4px; }
h2 { font-size: 1.1rem; margin: 0 0 12px; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px; margin: 16px 0; }
.row { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
label { display: block; margin: 0 0 10px; font-size: .9rem; color: var(--muted); }
input, select { display: block; width: 100%; margin-top: 4px; padding: 8px 10px; font: inherit; color: var(--fg);
  background: var(--bg); border: 1px solid var(--line); border-radius: 6px; }
form.inline { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; margin-top: 12px; }
form.inline label { flex: 1 1 140px; margin: 0; }
button { font: inherit; padding: 8px 16px; border-radius: 6px; border: 1px solid var(--accent);
  background: var(--accent); color: var(--accent-fg); cursor: pointer; }
button.secondary { background: transparent; color: var(--accent); }
button.primary { display: block; width: 100%; margin-top: 16px; padding: 12px; font-size: 1.05rem; font-weight: 600; }
button:disabled { opacity: .5; cursor: default; }
.tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tabs button { flex: 1; background: transparent; color: var(--muted); border-color: var(--line); }
.tabs button[aria-selected="true"] { color: var(--accent); border-color: var(--accent); font-weight: 600; }
#notice { padding: 10px 14px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); }
#notice.error { border-color: var(--danger); color: var(--danger); }
#notice.ok { border-color: var(--ok); color: var(--ok); }
.characters { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.characters label { display: flex; gap: 10px; align-items: center; margin: 0; padding: 10px 12px; color: var(--fg);
  border: 1px solid var(--line); border-radius: 8px; cursor: pointer; }
.characters input { width: auto; margin: 0; }
.characters label:has(input:checked) { border-color: var(--accent); }
.badge { font-size: .75rem; padding: 1px 6px; border-radius: 4px; border: 1px solid var(--accent); color: var(--accent); }
.code-box { margin: 12px 0; padding: 12px; border: 1px dashed var(--accent); border-radius: 8px; }
.code-box code { display: block; font-size: 1.3rem; letter-spacing: .08em; margin: 6px 0 10px; word-break: break-all; }
table { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: .85rem; }
th, td { text-align: left; padding: 6px 4px; border-bottom: 1px solid var(--line); vertical-align: top; }
td button { padding: 2px 8px; font-size: .8rem; }
@media (max-width: 560px) {
  table thead { display: none; }
  table, tbody, tr, td { display: block; width: 100%; }
  tr { border-bottom: 1px solid var(--line); padding: 6px 0; }
  td { border: 0; padding: 2px 0; }
}