:root {
  --bg: #f5f7fa;
  --surface: #ffffff;
  --text: #1c2430;
  --muted: #5b6676;
  --primary: #1f4e79;
  --primary-ink: #ffffff;
  --accent: #0b6e4f;
  --border: #d5dbe3;
  --error: #b42318;
  --focus: #f0a400;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11161d; --surface: #1a212b; --text: #e8edf3; --muted: #a2adbb;
    --primary: #5b9bd5; --primary-ink: #0b1220; --accent: #4cc39a; --border: #2d3846; --error: #ff8a80;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  font-size: 16px; line-height: 1.7;
}
.app-header { background: var(--primary); color: var(--primary-ink); padding: 12px 16px; padding-top: max(12px, env(safe-area-inset-top)); }
.app-title { font-weight: 700; font-size: 18px; }
.app-sub { font-size: 12px; opacity: .9; }
main { max-width: 560px; margin: 0 auto; padding: 16px; }
.screen { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 16px; }
h1 { font-size: 20px; margin: 0 0 12px; line-height: 1.4; }
a { color: var(--primary); }
.field { margin: 0 0 18px; }
.field label { display: block; font-weight: 600; margin-bottom: 6px; }
.req { font-size: 11px; font-weight: 600; color: var(--error); border: 1px solid currentColor; border-radius: 4px; padding: 0 4px; margin-left: 4px; vertical-align: 2px; }
input[type=text], input[type=email], input[type=tel] {
  width: 100%; min-height: 48px; padding: 10px 12px; font-size: 16px;
  border: 1px solid var(--border); border-radius: 8px; background: var(--surface); color: var(--text);
}
input:focus-visible, button:focus-visible, a:focus-visible, .opt input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }
.field.check { display: flex; gap: 10px; align-items: flex-start; flex-wrap: wrap; }
.field.check input { width: 24px; height: 24px; margin: 3px 0 0; flex: none; }
.field.check label { flex: 1; font-weight: 500; margin: 0; }
.field.check .error { flex-basis: 100%; }
.hint { color: var(--muted); font-size: 13px; margin: 4px 0 0; }
.error { color: var(--error); font-size: 14px; margin: 4px 0 0; min-height: 0; }
.error:empty { display: none; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.btn { display: block; width: 100%; min-height: 52px; font-size: 17px; font-weight: 700; border-radius: 10px; border: 0; cursor: pointer; margin-top: 12px; }
.btn.primary { background: var(--primary); color: var(--primary-ink); }
.btn.ghost { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.btn[disabled] { opacity: .55; cursor: progress; }
fieldset.q { border: 0; margin: 0 0 22px; padding: 0; }
fieldset.q legend { font-weight: 700; margin-bottom: 8px; padding: 0; }
.qno { color: var(--primary); margin-right: 4px; }
.opts { display: grid; gap: 8px; }
.opt { position: relative; display: block; }
.opt input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.opt span { display: flex; align-items: center; min-height: 48px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
.opt input:checked + span { border-color: var(--primary); box-shadow: inset 0 0 0 2px var(--primary); font-weight: 600; }
.amount { display: flex; align-items: center; gap: 8px; }
.amount input { flex: 1; text-align: right; }
.amount .unit { white-space: nowrap; }
.result { margin: 0; }
.result > div { padding: 12px 0; border-bottom: 1px solid var(--border); }
.result dt { color: var(--muted); font-size: 14px; }
.result dd { margin: 2px 0 0; }
.result .em { font-weight: 700; font-size: 18px; line-height: 1.5; }
.big { font-size: 26px; font-weight: 700; color: var(--accent); }
.note { margin-top: 14px; }
.cta { margin-top: 20px; padding: 16px; border-radius: var(--radius); background: color-mix(in srgb, var(--primary) 8%, var(--surface)); }
.cta p { margin: 0 0 8px; font-size: 15px; }
.done { font-size: 18px; font-weight: 600; }
.greeting { color: var(--muted); margin: 0 0 4px; }
.small { font-size: 13px; margin-top: 16px; text-align: center; }
.muted { color: var(--muted); }
.center { text-align: center; }
.app-footer { max-width: 560px; margin: 0 auto; padding: 8px 16px 32px; color: var(--muted); font-size: 12px; }
.policy h2 { font-size: 17px; margin: 22px 0 6px; }
.policy mark { background: #fff2b3; color: #1c2430; }
h1[tabindex="-1"]:focus { outline: none; }
.field.check .hint.full { flex-basis: 100%; margin-left: 34px; }