/* Auth Modal (login/register) */
.tai-auth-overlay{
  position:fixed;inset:0;
  background:rgba(17,24,39,.65);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  opacity:0;pointer-events:none;transition:opacity .2s ease;
  z-index:9999;
}
.tai-auth-overlay.show{opacity:1;pointer-events:auto}
.tai-auth-modal{
  position:fixed;left:50%;top:50%;transform:translate(-50%,-50%) scale(.98);
  width:min(560px,92vw);background:linear-gradient(135deg,#fff,#f9fafb);
  border-radius:18px;border:1px solid #e5e7eb;box-shadow:0 30px 80px rgba(0,0,0,.25);
  padding:18px;transition:transform .2s ease,opacity .2s ease;opacity:0;
}
.tai-auth-overlay.show .tai-auth-modal{opacity:1;transform:translate(-50%,-50%) scale(1)}
.tai-auth-close{position:absolute;right:10px;top:10px;border:0;background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:6px 10px;cursor:pointer}
.tai-auth-head{display:flex;gap:8px;margin-bottom:12px}
.tai-auth-tab{flex:1;text-align:center;padding:10px 12px;border-radius:12px;border:1px solid #e5e7eb;background:#fff;cursor:pointer;font-weight:700}
.tai-auth-tab.active{background:#111;color:#fff;border-color:#111}
.tai-auth-form{display:grid;gap:10px}
.tai-auth-form label{font-size:12px;color:#64748b}
.tai-auth-form input{height:46px;border:1px solid #e5e7eb;border-radius:12px;padding:0 12px;font-size:16px}
.tai-auth-submit{height:46px;border:0;border-radius:12px;background:#111;color:#fff;font-weight:700;cursor:pointer}
.tai-auth-error{color:#b91c1c;font-size:13px;display:none}
.tai-auth-error.show{display:block}
.tai-auth-foot{margin-top:8px;font-size:12px;color:#64748b}