:root {
  color-scheme: light;
  --bg:#f4f5f7; --surface:#fff; --ink:#16181d; --ink-2:#59616f;
  --line:#e2e5eb; --fill:#edeff3; --accent:#2a54d6;
  --danger:#b3261e; --warn:#8a5a00; --ok:#1b7a44; --on:#fff;
  --signal-off:#747985; --signal-red:#ff6b61; --signal-yellow:#ffd166; --signal-green:#5fd48a;
  font-family:"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic UI",Meiryo,system-ui,sans-serif;
}
* { box-sizing:border-box; }
body { margin:0; background:var(--bg); color:var(--ink); font-size:15px; line-height:1.9; letter-spacing:.02em; }
button,input { font:inherit; }
button { cursor:pointer; }
button { transition:background-color .15s,border-color .15s,box-shadow .15s,transform .08s; }
button:hover { filter:brightness(.97); }
button:active { transform:translateY(1px); }
button:disabled { cursor:wait; opacity:.68; }
a { color:var(--accent); text-underline-offset:3px; }
.ai-disclosure { width:100%; padding:8px 16px; border-bottom:1px solid var(--line); background:var(--surface); color:var(--ink-2); text-align:center; font-size:13px; line-height:1.8; }
.site-header { max-width:880px; margin:auto; padding:16px 24px; display:flex; justify-content:space-between; align-items:center; gap:16px; }
.brand { color:var(--ink); font-weight:700; text-decoration:none; }
.offline-badge { border:1px solid var(--line); border-radius:999px; padding:4px 12px; color:var(--ink-2); font-size:12px; font-weight:600; }
main { max-width:760px; margin:auto; padding:32px 24px 48px; }
.hero { min-height:380px; display:flex; flex-direction:column; justify-content:center; align-items:flex-start; max-width:640px; }
.eyebrow { margin:0 0 8px; color:var(--accent); font-size:13px; font-weight:700; }
h1 { margin:0 0 16px; font-size:clamp(2rem,7vw,3.5rem); line-height:1.35; letter-spacing:.01em; }
h2 { margin:0 0 16px; font-size:20px; line-height:1.55; }
.lead { max-width:640px; margin:0 0 24px; font-size:16px; }
.microcopy { margin:8px 0 0; color:var(--ink-2); font-size:13px; }
.primary,.secondary { min-height:48px; border-radius:6px; padding:10px 24px; font-weight:600; }
.primary { border:1px solid var(--accent); background:var(--accent); color:var(--on); }
.secondary { border:1px solid var(--line); background:var(--fill); color:var(--ink); }
button:focus-visible,input:focus-visible,a:focus-visible { outline:3px solid color-mix(in srgb,var(--accent) 30%,transparent); outline-offset:2px; }
.checker,.result,.about { margin-bottom:24px; padding:24px; border:1px solid var(--line); border-radius:12px; background:var(--surface); }
.checker { box-shadow:inset 4px 0 0 var(--accent); padding-left:28px; }
.progress-row { display:flex; align-items:center; gap:16px; color:var(--ink-2); font-size:13px; }
.progress-row p { margin:0; white-space:nowrap; font-variant-numeric:tabular-nums; }
progress { width:100%; height:8px; accent-color:var(--accent); }
.question { margin:0; padding:0; border:0; }
.question legend { margin-bottom:8px; font-size:18px; font-weight:700; line-height:1.55; }
.question legend span { display:inline-grid; width:32px; height:32px; margin-right:8px; place-items:center; border-radius:999px; background:var(--fill); font-size:15px; }
.question > p { margin:0 0 16px; max-width:640px; }
.question label { display:flex; gap:12px; align-items:flex-start; min-height:56px; margin-top:12px; padding:14px 16px; border:1px solid var(--line); border-radius:12px; line-height:1.7; cursor:pointer; transition:background-color .15s,border-color .15s,box-shadow .15s; }
.question label:hover { background:color-mix(in srgb,var(--accent) 5%,var(--surface)); }
.question label:has(input:checked) { border-color:var(--accent); box-shadow:inset 3px 0 0 var(--accent); }
.question input { flex:0 0 auto; width:20px; height:20px; margin-top:3px; accent-color:var(--accent); }
.actions { display:flex; justify-content:flex-end; gap:12px; margin-top:24px; }
.error { min-height:1.8em; margin:8px 0 0; color:var(--danger); font-size:13px; }
.result { text-align:center; }
.signal { width:112px; margin:0 auto 16px; padding:10px; display:flex; justify-content:center; gap:8px; border-radius:999px; background:var(--ink); }
.signal span { width:24px; height:24px; border-radius:50%; background:var(--signal-off); }
.signal[data-state="red"] span:nth-child(1) { background:var(--signal-red); }
.signal[data-state="yellow"] span:nth-child(2) { background:var(--signal-yellow); }
.signal[data-state="green"] span:nth-child(3) { background:var(--signal-green); }
.result-label { margin:0 0 4px; font-size:13px; font-weight:700; }
.result-message { max-width:640px; margin:0 auto 16px; }
.result-list { max-width:640px; margin:0 auto 24px; padding-left:24px; text-align:left; }
.notice { max-width:640px; margin:0 auto 24px; padding-top:16px; border-top:1px solid var(--line); color:var(--ink-2); font-size:13px; text-align:left; }
.ad-slot { min-height:112px; margin:24px 0; padding:16px; display:grid; place-items:center; border:1px dashed var(--line); border-radius:12px; background:var(--surface); color:var(--ink-2); text-align:center; }
.ad-slot span { font-size:12px; }
.ad-slot p,.ad-slot small { margin:0; }
.about p { max-width:640px; margin:0; }
footer { padding:32px 24px; border-top:1px solid var(--line); color:var(--ink-2); text-align:center; font-size:13px; }
footer nav { display:flex; justify-content:center; gap:24px; }
footer p { margin:8px 0 0; }
.copyright { font-variant-numeric:tabular-nums; }
[hidden] { display:none !important; }
@media (max-width:560px) {
  .site-header,main { padding-left:16px; padding-right:16px; }
  .site-header { align-items:flex-start; }
  main { padding-top:12px; }
  .hero { min-height:0; padding:20px 0 28px; }
  h1 { font-size:clamp(1.85rem,9vw,2.4rem); }
  .lead { margin-bottom:18px; }
  .checker,.result,.about { padding:16px; }
  .checker { padding-left:20px; }
  .actions { justify-content:stretch; }
  .actions button { flex:1; }
}
@media (prefers-reduced-motion:reduce) {
  *,*::before,*::after { scroll-behavior:auto !important; transition-duration:.01ms !important; animation-duration:.01ms !important; animation-iteration-count:1 !important; }
}
@media (prefers-reduced-motion:no-preference) {
  .checker,.result { animation:enter .22s ease-out; }
  @keyframes enter { from { opacity:0; transform:translateY(8px); } }
}
@media (prefers-color-scheme:dark) {
  :root { color-scheme:dark; --bg:#101216; --surface:#181b21; --ink:#f2f4f8; --ink-2:#b5bdca; --line:#3d4654; --fill:#242b36; --accent:#8eabff; --danger:#ff9b91; --warn:#f2c66d; --ok:#70d79b; --on:#11141a; }
}
:root[data-theme="dark"] { color-scheme:dark; --bg:#101216; --surface:#181b21; --ink:#f2f4f8; --ink-2:#b5bdca; --line:#3d4654; --fill:#242b36; --accent:#8eabff; --danger:#ff9b91; --warn:#f2c66d; --ok:#70d79b; --on:#11141a; }