html,body{ -webkit-text-size-adjust:100%; text-size-adjust:100%; }
body{ margin:0; font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans JP",sans-serif; background:#f6f7fb; color:#0f172a; }
header{ background:#fff; border-bottom:1px solid #e2e8f0; padding:14px; }
h1{ margin:0; font-size:18px; font-weight:900; }
main{ max-width:980px; margin:0 auto; padding:12px; }
.card{ background:#fff; border:1px solid #e2e8f0; border-radius:14px; box-shadow:0 1px 0 rgba(15,23,42,.04); padding:12px; margin:12px 0; }
.muted{ color:#64748b; }
a{ color:#2563eb; text-decoration:none; }
a:hover{ text-decoration:underline; }