/* The four pre-sign-in pages (operator, client code, client link, invite): one look.
   Design of record: active-runtime/builds/SIGNIN_MOCKUP/index.html (DESIGNS_OF_RECORD.md, 'Sign-in pages'). */
:root{
  --bg:#f7f4ee; --card:#ffffff; --ink:#0f172a; --mut:#615f58; --faint:#8c8a84;
  --line:rgba(0,0,0,.09); --line2:rgba(0,0,0,.16); --tint:#faf9f6; --soft:#efece4;
  --acc:#3d63d8; --acc-soft:#eef3fe; --ok:#2f9e5f; --ok-soft:#e7f6ec; --warn:#c2410c; --warn-soft:#fdeee0; --btn-ink:#fff;
  --display:"Fraunces",Georgia,serif; --body:Inter,-apple-system,"Segoe UI",sans-serif;
}
@media (prefers-color-scheme: dark){:root{
  --bg:#13151a; --card:#1b1e25; --ink:#e8eaf0; --mut:#a3a8b3; --faint:#7d838f;
  --line:rgba(255,255,255,.09); --line2:rgba(255,255,255,.18); --tint:#181b21; --soft:#23262e;
  --acc:#8aa6f5; --acc-soft:#232c45; --ok:#4cc17f; --ok-soft:#173022; --warn:#f08a4b; --warn-soft:#3a2516; --btn-ink:#0b1020; color-scheme:dark}}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:14px;min-height:100vh;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:22px;padding:40px 16px 20px}
h1{font-family:var(--display);font-weight:600;font-size:24px;margin:0;text-wrap:balance}
.card{width:100%;max-width:380px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px 28px 24px;
  box-shadow:0 1px 2px rgba(0,0,0,.04),0 8px 24px rgba(15,23,42,.05);display:flex;flex-direction:column;gap:16px}
.logo{display:block;height:18px;width:166px;max-width:100%;align-self:flex-start;background:var(--ink);
  -webkit-mask:url(/static/tandom_wm.svg) left center/contain no-repeat;mask:url(/static/tandom_wm.svg) left center/contain no-repeat}
.center{align-items:center;text-align:center}
.center .logo{align-self:center;-webkit-mask-position:center;mask-position:center}
.sub{color:var(--mut);font-size:13.5px;margin:-8px 0 0;line-height:1.45}
.field{display:flex;flex-direction:column;gap:5px}
.field label{font-size:12.5px;font-weight:500;color:var(--mut);display:flex;justify-content:space-between}
a,.link{color:var(--acc);text-decoration:none;font-weight:500;background:none;border:0;padding:0;font:inherit;font-weight:500;cursor:pointer}
input{font:inherit;font-size:15px;color:var(--ink);background:var(--tint);border:1px solid var(--line2);border-radius:9px;padding:11px 12px;width:100%}
input:focus{outline:2px solid var(--acc);outline-offset:-1px;background:var(--card)}
input[readonly]{color:var(--mut)}
.pw{position:relative}
.pw input{padding-right:70px}
.pw button{position:absolute;right:8px;top:50%;transform:translateY(-50%);font:inherit;font-size:12px;color:var(--mut);background:transparent;border:0;cursor:pointer}
.btn{display:block;text-align:center;font:inherit;font-size:15px;font-weight:600;border-radius:9px;padding:12px 14px;border:0;background:var(--acc);color:var(--btn-ink);cursor:pointer;width:100%}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line2)}
.btn[disabled]{opacity:.55;cursor:default}
.code{display:grid;grid-template-columns:repeat(6,1fr);gap:8px}
.code input{text-align:center;font-size:22px;font-weight:600;padding:10px 0;font-variant-numeric:tabular-nums}
.meta{display:flex;justify-content:space-between;gap:10px;font-size:12.5px;color:var(--mut)}
.err,.okline{display:flex;gap:8px;align-items:flex-start;border-radius:9px;padding:10px 12px;font-size:13px;line-height:1.4}
.err{background:var(--warn-soft);color:var(--warn)}
.okline{background:var(--ok-soft);color:var(--ok)}
[hidden]{display:none!important}
.spin{width:22px;height:22px;border-radius:50%;border:2.5px solid var(--soft);border-top-color:var(--acc);animation:sp .9s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
.foot{font-size:11.5px;color:var(--faint);text-align:center}
.who{display:flex;gap:10px;align-items:center;background:var(--tint);border:1px solid var(--line);border-radius:10px;padding:10px 12px}
.who .av{width:32px;height:32px;border-radius:50%;background:var(--acc-soft);color:var(--acc);display:grid;place-items:center;font-weight:700;font-size:13px;flex:none}
.who b{display:block;font-size:13.5px}
.who span{font-size:12.5px;color:var(--mut)}
.rules{font-size:12px;color:var(--mut)}
.rules.y{color:var(--ok)}
.stack{display:flex;flex-direction:column;gap:16px}