:root{--bg:#0f172a;--card:#111827;--text:#e5e7eb;--muted:#9ca3af;--accent:#38bdf8;}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,'Noto Sans JP',sans-serif;background:var(--bg);color:var(--text)}
.container{max-width:720px;margin:4rem auto;padding:0 1rem}
.center{text-align:center}
.card{background:rgba(17,24,39,.7);padding:1.25rem;border-radius:16px}
.field{display:flex;flex-direction:column;gap:.4rem;margin-bottom:1rem}
input,textarea{padding:.8rem;border-radius:12px;border:1px solid #333;background:#0b1220;color:var(--text)}
button,.btn{background:var(--accent);color:#082f49;padding:.8rem 1.1rem;border-radius:12px;cursor:pointer}
.notice{margin:1rem 0;padding:.9rem;background:#0b3a54}
.hp{position:absolute;left:-9999px;height:0;overflow:hidden}