:root {
  --bg: #f4f5fb;
  --card: #ffffff;
  --text: #1c1d2b;
  --muted: #62657a;
  --line: #dcdeea;
  --accent: #4f46e5;
  --accent-text: #ffffff;
  --link: var(--accent);
  --error-bg: #fdecec;
  --error: #a32020;
  --info-bg: #eaf3ff;
  --info: #174a8c;
  color-scheme: light;
}
/* tema oscuro: el del sistema, salvo que la app pida theme=light; o el que pida la app (theme=dark) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme=light]) {
    --bg: #12131c;
    --card: #1c1d2b;
    --text: #ecedf5;
    --muted: #a3a6bd;
    --line: #34364a;
    --accent: #8b85ff;
    --accent-text: #12131c;
    --error-bg: #3a1b1f;
    --error: #ffb3b3;
    --info-bg: #182a44;
    --info: #b8d4ff;
    color-scheme: dark;
  }
}
:root[data-theme=dark] {
  --bg: #12131c;
  --card: #1c1d2b;
  --text: #ecedf5;
  --muted: #a3a6bd;
  --line: #34364a;
  --accent: #8b85ff;
  --accent-text: #12131c;
  --error-bg: #3a1b1f;
  --error: #ffb3b3;
  --info-bg: #182a44;
  --info: #b8d4ff;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 24px 16px; background: var(--bg); color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.card { width: 100%; max-width: 400px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 28px 24px; }
.back { display: inline-block; margin: -8px 0 14px; font-size: 14px; text-decoration: none; }
.back:hover { text-decoration: underline; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 16px; margin-bottom: 18px; }
.logo { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: var(--accent); color: var(--accent-text); font-weight: 700; }
.app-logo { width: 28px; height: 28px; border-radius: 6px; object-fit: contain; }
h1 { font-size: 22px; margin: 0 0 6px; }
p { margin: 0 0 16px; }
.muted { color: var(--muted); }
label { display: block; margin: 0 0 14px; font-weight: 500; }
input[type=text], input[type=password] {
  display: block; width: 100%; margin-top: 6px; padding: 11px 12px; font: inherit; font-size: 16px; color: var(--text);
  background: transparent; border: 1px solid var(--line); border-radius: 8px;
}
input[aria-invalid=true] { border-color: var(--error); }
input:focus-visible, button:focus-visible, a:focus-visible, .error:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.check { display: flex; gap: 8px; align-items: center; font-weight: 400; }
.check input { width: 18px; height: 18px; }
button {
  width: 100%; min-height: 44px; padding: 11px; font: inherit; font-weight: 600; border: 0; border-radius: 8px;
  background: var(--accent); color: var(--accent-text); cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
}
button[aria-busy=true] { cursor: progress; opacity: 0.85; }
button[aria-busy=true]::before {
  content: ""; width: 16px; height: 16px; border-radius: 50%; border: 2px solid currentColor; border-right-color: transparent;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { button[aria-busy=true]::before { animation: none; } }
a { color: var(--link); }
.links { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; margin-top: 16px; font-size: 14px; }
.error { background: var(--error-bg); color: var(--error); padding: 10px 12px; border-radius: 8px; margin-bottom: 16px; }
.info { background: var(--info-bg); color: var(--info); padding: 10px 12px; border-radius: 8px; margin-bottom: 16px; }
.foot { color: var(--muted); font-size: 13px; margin-top: 16px; text-align: center; max-width: 400px; }
/* transición de sesión ("Iniciando sesión…" / "Cerrando sesión…"): toda la pantalla con el color de la app (o el de Zuleny) */
.transition {
  position: fixed; inset: 0; z-index: 1000; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 18px; padding: 24px 16px; text-align: center;
  background: linear-gradient(160deg, var(--accent), color-mix(in srgb, var(--accent) 62%, #000));
  color: var(--accent-text);
}
.transition[hidden] { display: none; }
.transition.fade { animation: transition-in 0.2s ease-out; }
.transition-brand { display: flex; flex-direction: column; align-items: center; gap: 10px; font-size: 18px; }
.transition-logo { width: 64px; height: 64px; border-radius: 16px; object-fit: contain; }
.transition .logo { background: var(--accent-text); color: var(--accent); font-size: 30px; }
.transition-spinner {
  width: 34px; height: 34px; border-radius: 50%;
  border: 3px solid color-mix(in srgb, currentColor 30%, transparent); border-top-color: currentColor;
  animation: spin 0.8s linear infinite;
}
.transition-text { margin: 0; font-size: 16px; opacity: 0.9; }
.transition-continue { color: inherit; font-size: 14px; opacity: 0.85; }
.transition-continue:focus-visible { outline-color: currentColor; }
@keyframes transition-in { from { opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
  .transition.fade, .transition-spinner { animation: none; }
}
@media (max-width: 440px) {
  body { justify-content: flex-start; padding: 16px; }
  .card { padding: 22px 18px; }
}
/* selector de cuenta (prompt=select_account): "Continuar como …" y "Usar otra cuenta" */
button.account { justify-content: flex-start; gap: 12px; min-height: 64px; padding: 12px 14px; text-align: left; }
button.account[aria-busy=true]::before { display: none; }
.avatar {
  flex: none; display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 50%;
  background: var(--accent-text); color: var(--accent); font-weight: 700; font-size: 18px;
}
.account-text { display: flex; flex-direction: column; min-width: 0; }
.account-name { overflow-wrap: anywhere; }
.account-id { font-weight: 400; font-size: 13px; opacity: 0.85; overflow-wrap: anywhere; }
.button-secondary {
  display: flex; align-items: center; justify-content: center; min-height: 44px; margin-top: 12px; padding: 10px;
  border: 1px solid var(--line); border-radius: 8px; color: var(--text); font-weight: 600; text-decoration: none;
}
.button-secondary:hover { border-color: var(--accent); }
@media (prefers-reduced-motion: no-preference) { .button-secondary { transition: border-color 0.15s; } }