:root {
  --bg: #eef1f6; --card: #fff; --ink: #1b1f27; --ink2: #545c6b; --ink3: #868e9c;
  --line: #d3d7de; --line2: #bcc2cc; --accent: #1f5fb0; --accent2: #17497f;
  --ok: #2e8b57; --bad: #c0392b; --gold-bg: #fbe6c0;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #12151b; --card: #1a1e26; --ink: #e6e9f0; --ink2: #a8b0be; --ink3: #7b8493;
          --line: #313846; --line2: #3f4756; --accent: #6ea8ff; --accent2: #4d84d8; --gold-bg: #4a3a1d;
          color-scheme: dark; }
}
* { box-sizing: border-box; }
body.auth { margin: 0; min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 24px 16px; background: var(--bg); color: var(--ink);
  font: 14px/1.5 "Segoe UI", -apple-system, Roboto, sans-serif; }
.card { background: var(--card); border: 1px solid var(--line2); border-radius: 10px;
  box-shadow: 0 10px 40px rgba(0,0,0,.12); padding: 22px 24px; width: min(430px, 100%); }
.card.wide { width: min(760px, 100%); }
.brand { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.brand h1 { margin: 0; font-size: 20px; }
.sub, .hint { color: var(--ink3); font-size: 12.5px; margin: 2px 0 0; }
h2 { font-size: 15px; margin: 4px 0 6px; }
label { display: block; font-size: 12.5px; color: var(--ink2); margin: 12px 0 4px; }
label.check { display: flex; align-items: center; gap: 7px; margin-top: 14px; }
label.check input { width: auto; }
input, select { width: 100%; padding: 8px 10px; border: 1px solid var(--line); border-radius: 5px;
  background: var(--card); color: inherit; font: inherit; outline: none; }
input:focus, select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
.btn { display: inline-block; margin-top: 14px; padding: 9px 16px; border: 1px solid var(--line2);
  border-radius: 5px; background: var(--card); color: inherit; font: inherit; cursor: pointer; text-decoration: none; }
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; width: 100%; text-align: center; }
.btn.primary:hover { background: var(--accent2); }
.btn.small { margin-top: 6px; padding: 4px 9px; font-size: 12.5px; width: auto; }
.msg { min-height: 18px; margin: 10px 0 0; font-size: 13px; color: var(--bad); }
.msg.ok { color: var(--ok); }
.foot { margin: 16px 0 0; text-align: center; font-size: 13px; }
.foot a, #rec-back { color: var(--accent); cursor: pointer; }
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; }
@media (max-width: 640px) { .cols { grid-template-columns: 1fr; } }
.secret { font-family: ui-monospace, Consolas, monospace; font-size: 15px; letter-spacing: 1px;
  background: var(--gold-bg); border: 1px solid #d8ab5e; border-radius: 5px; padding: 9px;
  word-break: break-all; margin-top: 4px; }
.codes { list-style: none; padding: 0; margin: 10px 0; display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.codes li { font-family: ui-monospace, Consolas, monospace; background: var(--bg);
  border: 1px solid var(--line); border-radius: 4px; padding: 5px 8px; }
.help { margin-top: 18px; font-size: 12.5px; color: var(--ink3); }
.help summary { cursor: pointer; }
.help pre { background: var(--bg); border: 1px solid var(--line); border-radius: 4px;
  padding: 7px; overflow-x: auto; font-size: 12px; }