:root {
  color-scheme: light dark;
  --bg: #fbfaf6;
  --surface: #ffffff;
  --text: #1f2a28;
  --muted: #4d5a57;
  --accent: #2f6b5e;
  --accent-text: #ffffff;
  --accent-soft: #e3f0ec;
  --line: #6f7f7a;
  --warn-bg: #fff4e0;
  --warn-line: #b3641b;
  --focus: #1b4fd1;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141a19;
    --surface: #1d2523;
    --text: #eef3f1;
    --muted: #b7c3bf;
    --accent: #7cc4b3;
    --accent-text: #0e1d19;
    --accent-soft: #24332f;
    --line: #8a9a95;
    --warn-bg: #3a2c16;
    --warn-line: #e0a058;
    --focus: #8fb2ff;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  font-size: 18px; line-height: 1.8;
}
main { max-width: 640px; margin: 0 auto; padding: 20px 16px 48px; }
h1 { font-size: 1.35rem; line-height: 1.5; margin: 0 0 8px; }
h2 { font-size: 1.2rem; line-height: 1.6; margin: 0 0 8px; }
h3 { font-size: 1.05rem; margin: 20px 0 6px; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); font-size: 0.9rem; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px 16px; margin: 14px 0; }
.privacy { background: var(--accent-soft); border-radius: 10px; padding: 10px 14px; font-size: 0.92rem; margin: 14px 0; }
progress { width: 100%; height: 10px; accent-color: var(--accent); margin: 4px 0 14px; }
fieldset { border: 0; padding: 0; margin: 0; }
legend { padding: 0; }
.opt { display: flex; align-items: center; gap: 12px; min-height: 56px; padding: 10px 14px; margin: 10px 0;
  background: var(--surface); border: 2px solid var(--line); border-radius: 12px; cursor: pointer; }
.opt:hover { border-color: var(--accent); }
.opt input { width: 24px; height: 24px; flex: none; accent-color: var(--accent); }
.opt.is-on { border-color: var(--accent); background: var(--accent-soft); }
.opt.is-off { opacity: 0.6; cursor: not-allowed; }
.opt .tick { font-weight: 700; color: var(--accent); }
.row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 18px; }
button, .btn {
  font: inherit; min-height: 52px; padding: 10px 22px; border-radius: 12px; border: 2px solid var(--accent);
  background: var(--surface); color: var(--text); cursor: pointer; text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center; text-align: center;
}
button.primary, .btn.primary { background: var(--accent); color: var(--accent-text); font-weight: 700; }
button:disabled { opacity: 0.55; cursor: not-allowed; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
textarea { width: 100%; font: inherit; font-size: 1rem; line-height: 1.7; padding: 10px 12px; border: 2px solid var(--line);
  border-radius: 10px; background: var(--surface); color: var(--text); }
textarea.out { min-height: 11em; resize: vertical; }
.badge { display: inline-block; background: var(--accent-soft); border: 2px solid var(--accent); border-radius: 999px;
  padding: 4px 16px; font-weight: 700; margin: 4px 0 10px; }
.sentence { white-space: pre-wrap; background: var(--accent-soft); border-radius: 10px; padding: 12px 14px; margin: 6px 0 4px; }
.steps { padding-left: 1.4em; margin: 6px 0; }
.steps li { margin: 8px 0; }
.warn { background: var(--warn-bg); border-left: 6px solid var(--warn-line); border-radius: 8px; padding: 10px 14px; margin: 12px 0; }
.note { font-size: 0.88rem; color: var(--muted); border-top: 1px solid var(--line); padding-top: 10px; margin-top: 28px; }
.status { min-height: 1.6em; font-size: 0.95rem; color: var(--muted); margin: 6px 0 0; }
@media (max-width: 480px) { body { font-size: 17px; } .row > * { flex: 1 1 100%; } }