:root {
  --bg: #fbf7f0;
  --paper: #ffffff;
  --ink: #2b2522;
  --muted: #7a6f66;
  --line: #e4dccf;
  --hon: #c8102e;
  --double: #6e0e1e;
  --side: #f0a39b;
  --happou: #5e4f8c;
  --none: #e9e1d4;
  --gold: #c9971c;
  --radius: 14px;
  color-scheme: light;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic", Meiryo, system-ui, sans-serif;
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--hon); }

main { max-width: 760px; margin: 0 auto; padding: 0 16px 48px; }

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  max-width: 760px;
  margin: 0 auto;
  padding: 14px 16px;
  border-top: 6px solid var(--hon);
}
.brand { font-weight: 800; font-size: 1.15rem; color: var(--hon); text-decoration: none; }
.site-header nav { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: .9rem; }
.site-header nav a { color: var(--ink); text-decoration: none; }

.hero { padding: 24px 0 8px; }
.hero h1 { font-size: clamp(1.6rem, 6vw, 2.3rem); line-height: 1.3; margin: 0 0 12px; }
.hero-lead { margin: 0 0 8px; }
.hero-fact { margin: 0; font-weight: 700; color: var(--hon); }

h2 { font-size: 1.3rem; line-height: 1.4; margin: 36px 0 12px; }

.checker, .family {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 16px;
  margin-top: 24px;
}
.checker h2, .family h2 { margin-top: 0; }

.checker-form { display: grid; gap: 14px; }
.field { display: grid; gap: 4px; font-weight: 700; font-size: .95rem; }
.field select, .family-row select, .family-row input {
  font: inherit;
  font-weight: 400;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  min-height: 44px;
  width: 100%;
}
fieldset.sex { border: 0; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: center; }
fieldset.sex legend { padding: 0; margin-bottom: 4px; }
fieldset.sex label { font-weight: 400; display: flex; gap: 6px; align-items: center; min-height: 44px; }
fieldset.sex input { width: 20px; height: 20px; accent-color: var(--hon); }
.form-error { color: var(--hon); margin: 0; font-weight: 700; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--ink);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}
.btn:focus-visible, select:focus-visible, input:focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; }
.btn-primary { background: var(--hon); border-color: var(--hon); color: #fff; }
.btn-x { background: #111; border-color: #111; color: #fff; }
.btn-line { background: #06c755; border-color: #06c755; color: #fff; }
.btn-small { min-height: 36px; padding: 4px 12px; font-size: .85rem; }
.btn:disabled { opacity: .4; cursor: default; }

.result { margin-top: 24px; border-top: 1px dashed var(--line); padding-top: 20px; }
.year-tabs { display: flex; gap: 8px; margin-bottom: 12px; }
.year-tabs button {
  font: inherit; font-weight: 700; padding: 6px 16px; min-height: 40px;
  border-radius: 999px; border: 1px solid var(--line); background: var(--bg); color: var(--muted); cursor: pointer;
}
.year-tabs button[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: #fff; }

.r-lead { margin: 0; font-weight: 700; }
.r-title { margin: 0; font-size: clamp(2.2rem, 11vw, 3.6rem); font-weight: 900; line-height: 1.2; }
.sev-double { color: var(--double); }
.sev-hon { color: var(--hon); }
.sev-side { color: #b4473c; }
.sev-happou { color: var(--happou); }
.sev-none { color: var(--ink); }
.r-tagline { margin: 4px 0 0; font-weight: 700; color: var(--hon); font-size: 1.1rem; }
.r-meta { margin: 0; color: var(--muted); }
.r-map { margin: 16px 0; max-width: 380px; }
.r-map svg { width: 100%; height: auto; display: block; }
.r-stats { list-style: none; padding: 0; margin: 0 0 12px; display: grid; gap: 2px; }
.r-stats strong { font-size: 1.3rem; color: var(--hon); }
.r-line {
  margin: 16px 0;
  padding: 14px 16px;
  background: var(--bg);
  border-left: 4px solid var(--gold);
  border-radius: 0 10px 10px 0;
}
.r-line p { margin: 0; font-weight: 700; }
.r-line footer { margin-top: 6px; font-size: .8rem; color: var(--muted); }
.share { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 8px; }
.r-note { font-size: .85rem; color: var(--muted); margin: 8px 0 0; }

.result-hero .btn { margin-top: 8px; }

.family-rows { display: grid; gap: 10px; margin: 12px 0; }
.family-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; align-items: center; }
.family-row input { grid-column: 1 / -1; }
.family-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.family-out { margin-top: 16px; }
.family-out svg { width: 100%; height: auto; display: block; border-radius: 10px; }

@media (min-width: 600px) {
  .family-row { grid-template-columns: 2fr 2fr 1fr auto; }
  .family-row input { grid-column: auto; }
}

.tables { margin-top: 8px; }
.table-pair { display: grid; gap: 16px; }
@media (min-width: 680px) { .table-pair { grid-template-columns: 1fr 1fr; } }
.table { width: 100%; border-collapse: collapse; background: var(--paper); font-size: .92rem; }
.table caption { text-align: left; font-weight: 700; padding: 6px 0; }
.table th, .table td { border: 1px solid var(--line); padding: 6px 8px; text-align: left; }
.table thead th { background: var(--bg); }
.k-hon td:first-child { color: var(--hon); font-weight: 700; }
.k-happou td:first-child { color: var(--happou); font-weight: 700; }

.prose p { margin: 0 0 12px; }
.faq details { border-bottom: 1px solid var(--line); padding: 10px 0; }
.faq summary { font-weight: 700; cursor: pointer; }
.faq details p { margin: 8px 0 0; }

.figure .r-map { max-width: 420px; }

.site-footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 40px;
  color: var(--muted);
  font-size: .85rem;
  border-top: 1px solid var(--line);
}