:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #1c2430;
  --muted: #4b5563;
  --border: #cfd6df;
  --primary: #0b5cad;
  --primary-text: #ffffff;
  --danger: #a61b1b;
  --warn-bg: #fff6e0;
  --note-bg: #e8f1fb;
  --focus: #ff9d00;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11161d;
    --surface: #1a212b;
    --text: #e8edf3;
    --muted: #b6c0cc;
    --border: #3a4552;
    --primary: #7ab8f5;
    --primary-text: #0b1520;
    --danger: #ff8a8a;
    --warn-bg: #3a3012;
    --note-bg: #17293d;
  }
}
* { box-sizing: border-box; }
html { font-size: 100%; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;
  line-height: 1.75; font-size: 1rem;
}
.wrap { width: 100%; max-width: 760px; margin: 0 auto; padding: 0 16px; }
a { color: var(--primary); }
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible, select:focus-visible {
  outline: 3px solid var(--focus); outline-offset: 2px;
}
.skip { position: absolute; left: -999px; top: 0; background: var(--surface); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; top: 8px; }

.site-header { background: var(--surface); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 4px 16px; padding-top: 10px; padding-bottom: 10px; }
.brand { font-weight: 700; color: var(--text); text-decoration: none; }
.site-header nav a { margin-left: 14px; padding: 6px 0; display: inline-block; }

main { padding-top: 16px; padding-bottom: 32px; }
h1 { font-size: 1.4rem; line-height: 1.4; margin: 20px 0 8px; }
h2 { font-size: 1.2rem; margin: 28px 0 8px; line-height: 1.4; }
h3 { font-size: 1.05rem; margin: 0 0 8px; }
.lead { margin-top: 0; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 16px; margin: 12px 0; }
.privacy-note { background: var(--note-bg); border-radius: 8px; padding: 10px 14px; margin: 0; }
.caution { background: var(--warn-bg); border-radius: 8px; padding: 10px 14px; }
.help { color: var(--muted); font-size: 0.875rem; margin: 6px 0 0; }
.error { color: var(--danger); font-weight: 600; margin: 6px 0 0; }
.over { color: var(--danger); }
.deadline { margin: 4px 0; color: var(--muted); font-size: 0.9rem; }

.field { margin: 0 0 16px; border: 0; padding: 0; min-width: 0; }
legend, label { font-weight: 600; }
.choice { display: flex; align-items: flex-start; gap: 8px; font-weight: 400; padding: 8px 0; min-height: 44px; }
.choice input { margin-top: 6px; width: 20px; height: 20px; flex: none; }
input[type="text"], input[type="number"], input[type="date"] {
  width: 100%; min-height: 48px; padding: 8px 12px; font: inherit;
  color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
}
input[aria-invalid="true"] { border-color: var(--danger); border-width: 2px; }
.input-unit { display: flex; align-items: center; gap: 8px; }
.counts { display: grid; gap: 12px; }
.counts label { display: block; font-weight: 400; }
.counts input { margin-top: 4px; }
.grid2 { display: grid; gap: 12px; }

.btn {
  display: inline-block; min-height: 48px; padding: 10px 18px; font: inherit; font-weight: 600;
  color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: 8px; cursor: pointer;
}
.btn.primary { background: var(--primary); color: var(--primary-text); border-color: var(--primary); width: 100%; }
.btn.danger { color: var(--danger); border-color: var(--danger); }
.btn.small { min-height: 44px; padding: 6px 14px; margin-top: 8px; }
.actions { display: grid; gap: 10px; margin: 16px 0; }

.big { font-size: 1.2rem; margin: 8px 0; }
.big strong { font-size: 1.7rem; }
details { margin: 10px 0; }
summary { font-weight: 600; cursor: pointer; padding: 8px 0; min-height: 44px; }
.entry-meta { margin: 0 0 6px; color: var(--muted); }
.summary p { margin: 4px 0; }

.prose h2 { border-bottom: 1px solid var(--border); padding-bottom: 4px; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.9rem; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--border); padding: 6px 8px; text-align: left; vertical-align: top; }

.ad-slot { margin: 24px 0; min-height: 0; }
.site-footer { border-top: 1px solid var(--border); padding: 16px 0 28px; color: var(--muted); font-size: 0.9rem; }
.site-footer p { margin: 6px 0; }

@media (min-width: 600px) {
  .counts { grid-template-columns: repeat(3, 1fr); }
  .grid2 { grid-template-columns: 1fr 1fr; }
  .btn.primary { width: auto; min-width: 220px; }
  .actions { grid-template-columns: auto auto; justify-content: start; }
  h1 { font-size: 1.7rem; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }