:root {
  --ink: #1b2330;
  --muted: #5b6573;
  --line: #d5dbe3;
  --bg: #f4f6f9;
  --card: #ffffff;
  --brand: #12406b;
  --warn-bg: #fff6e0;
  --warn-line: #e3b341;
  --ok: #1d6b3a;
  --err: #a12828;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e6e9ee;
    --muted: #a3adbb;
    --line: #3a4350;
    --bg: #12161c;
    --card: #1b2029;
    --brand: #7fb2e5;
    --warn-bg: #3a2f12;
    --warn-line: #b8902e;
    --ok: #6cc38b;
    --err: #ef8a8a;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; } /* button の display: block が hidden を打ち消さないように */
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  padding: env(safe-area-inset-top) 0 env(safe-area-inset-bottom);
}
header, main, footer { max-width: 560px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 20px; }
h1 { font-size: 1.15rem; margin: 0; color: var(--brand); }
h2 { font-size: 1.05rem; margin: 0 0 8px; }
.sub, .small, footer { color: var(--muted); font-size: 0.85rem; }
.sub { margin: 4px 0 12px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  margin: 0 0 16px;
}
.card.warn { background: var(--warn-bg); border-color: var(--warn-line); }
.card p { margin: 0 0 8px; }
ol, ul { margin: 0 0 8px; padding-left: 1.4em; }
.place { margin: 12px 0; }
.place label { display: block; font-weight: 600; margin-bottom: 4px; }
.pick { display: flex; gap: 8px; }
select {
  flex: 1 1 0;
  min-width: 0;
  font-size: 16px; /* iPhone が拡大しない大きさ */
  padding: 10px 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
}
select:first-child { flex: 0 0 7.5em; }
button {
  display: block;
  width: 100%;
  font-size: 1rem;
  font-weight: 600;
  padding: 14px;
  margin-top: 12px;
  border: 0;
  border-radius: 10px;
  background: var(--brand);
  color: #fff;
}
@media (prefers-color-scheme: dark) { button { color: #0d1620; } }
button.secondary { background: transparent; color: var(--brand); border: 1px solid var(--brand); }
button:disabled { opacity: 0.5; }
#status { margin: 12px 0 0; min-height: 1.6em; }
#status.ok { color: var(--ok); }
#status.err { color: var(--err); }
footer { padding-bottom: 24px; }
footer p { margin: 0 0 4px; }