:root {
  color-scheme: light dark;
  --bg: #f4f6f8;
  --card: #fff;
  --text: #16181d;
  --muted: #6b7280;
  --line: #d8dde5;
  --accent: #1769e0;
  --danger: #b42318;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101216;
    --card: #181b21;
    --text: #f4f5f7;
    --muted: #aab0bb;
    --line: #343944;
    --accent: #6ba4ff;
  }
}
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--text); font:16px system-ui,sans-serif; }
.shell { min-height:100vh; display:grid; place-items:center; padding:24px; }
.card { width:min(480px,100%); background:var(--card); border:1px solid var(--line); border-radius:18px; padding:28px; box-shadow:0 16px 40px rgba(0,0,0,.12); }
.brand { font-size:28px; font-weight:750; margin-bottom:8px; }
.target,.muted { color:var(--muted); }
label { display:block; margin:14px 0; font-weight:600; }
input[type=text],input[type=password],input[name=username] { width:100%; padding:12px 14px; margin-top:6px; border-radius:10px; border:1px solid var(--line); background:transparent; color:var(--text); }
.remember { display:flex; gap:8px; align-items:center; font-weight:500; }
button,a.secondary,a.continue-button { border-radius:11px; padding:12px 16px; text-decoration:none; text-align:center; cursor:pointer; }
.primary,.passkey { width:100%; border:0; font-weight:700; }
.primary { background:var(--accent); color:white; }
.passkey { background:transparent; color:var(--text); border:1px solid var(--line); }
.divider { display:flex; align-items:center; gap:10px; margin:20px 0; color:var(--muted); }
.divider:before,.divider:after { content:""; height:1px; flex:1; background:var(--line); }
.ok { padding:12px; border-radius:10px; background:rgba(32,160,80,.12); font-weight:700; }
.settings-box { border:1px solid var(--line); border-radius:12px; padding:16px; margin:20px 0; }
.secondary { display:block; border:1px solid var(--line); color:var(--text); margin-top:10px; }
.continue-button { display:block; margin-top:28px; padding:18px; background:var(--accent); color:white; font-weight:800; font-size:18px; }
.error { padding:12px; border-radius:10px; background:rgba(200,40,40,.12); color:var(--danger); }
.key-row { display:flex; justify-content:space-between; gap:12px; align-items:center; border-top:1px solid var(--line); padding:12px 0; }
.danger { border:1px solid var(--danger); color:var(--danger); background:transparent; }