:root{--bg:#f2f3ef;--panel:#fbfbf8;--line:#d8dbd2;--ink:#1b2130;--ink2:#4d5566;--ink3:#838a96;--accent:#2f7d6d;--bad:#b03a30;--bad-bg:#f8e5e2;--warn:#9a6a00;--warn-bg:#fbf0d8;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;color-scheme:light}
@media (prefers-color-scheme:dark){:root{--bg:#12161c;--panel:#1b2029;--line:#2c3441;--ink:#e8eaee;--ink2:#aab1bd;--ink3:#7b8491;--accent:#5fb8a2;--bad:#ef7f74;--bad-bg:#3a1f1c;--warn:#e3b35a;--warn-bg:#33291a;color-scheme:dark}}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px 16px;background:var(--bg);color:var(--ink);
  font:15px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
.box{width:100%;max-width:380px;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:24px 22px}
.logo{font-family:var(--serif);font-size:22px;font-weight:600;margin-bottom:18px}
.logo img{display:block;height:62px;width:auto;margin:0 0 2px -4px}
@media (prefers-color-scheme:dark){.logo img{filter:drop-shadow(0 0 6px rgba(255,214,170,.28))}}
.logo span{display:block;font-family:inherit;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink3);font-weight:600}
h1{font-size:19px;margin:0 0 6px}
.sub{color:var(--ink2);font-size:13.5px;margin:0 0 16px}
label{display:block;font-size:13px;font-weight:600;color:var(--ink2);margin:0 0 5px}
input{width:100%;font:inherit;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:9px 11px;margin-bottom:14px}
input:focus{outline:2px solid var(--accent);outline-offset:1px}
input.code6{font:600 22px/1 ui-monospace,Menlo,monospace;letter-spacing:.3em;text-align:center}
button{width:100%;font:inherit;font-weight:600;cursor:pointer;border-radius:8px;border:1px solid var(--accent);background:var(--accent);color:#fff;padding:10px 12px}
.msg{font-size:13.5px;border-radius:8px;padding:9px 11px;margin:0 0 14px}
.msg.bad{background:var(--bad-bg);color:var(--bad)}.msg.warn{background:var(--warn-bg);color:var(--warn)}
a.back{display:block;text-align:center;margin-top:14px;color:var(--ink2);font-size:13px}
.msg.good{background:color-mix(in srgb,#2f6f5e 14%,transparent);color:#2f6f5e}