:root{--bg:#FAF8F3;--ink:#1C1C1C;--muted:#55524C;--line:#E6E0D2;--brand:#16213D;--surface:#fff}
@media (prefers-color-scheme:dark){:root{--bg:#0F1528;--ink:#F3EEE3;--muted:#B9B2A3;--line:#2A3557;--surface:#18213B;--brand:#C9B88F}button{color:#0F1528}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 Sarabun,system-ui,'Noto Sans Thai',sans-serif}
.wrap{max-width:720px;margin:0 auto;padding:24px 16px 48px}.brand{font-weight:700;color:var(--brand);text-decoration:none}
h1{font-size:28px;margin:18px 0 8px}h2{font-size:19px;margin:22px 0 6px}.muted{color:var(--muted);font-size:14px}.err{color:#B42318;font-weight:700}
.card{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:18px;display:flex;flex-direction:column;gap:12px;max-width:420px}
label{display:flex;flex-direction:column;gap:4px;font-weight:700;font-size:14px}input{font:inherit;padding:11px 13px;border:1px solid var(--line);border-radius:12px;background:var(--bg);color:var(--ink)}
button{font:inherit;font-weight:700;background:var(--brand);color:#fff;border:0;border-radius:99px;padding:11px 20px;cursor:pointer;align-self:flex-start}
footer{margin-top:40px;color:var(--muted);font-size:13px;border-top:1px solid var(--line);padding-top:12px}code{background:var(--line);padding:2px 6px;border-radius:6px}