/* ===== Componentes compartidos por el portal y el formulario de tests =====
   La cabecera del portal (logo, "Portal de testers" y "Salir"), los botones .btn y .sr-only.
   La cargan las páginas del portal (antes de portal.css) y formulario_tests_v2.html, para no
   duplicar estilos: portal.css entero no se puede cargar en el formulario porque sus estilos
   globales (fondo, tipografía, resets) lo cambiarían. Valores de design-tokens.css. */

/* ===== Botones ===== */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 24px;
  border: 1.5px solid transparent;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition:
    background 0.2s,
    border-color 0.2s,
    color 0.2s,
    box-shadow 0.2s,
    transform 0.1s;
  -webkit-tap-highlight-color: transparent;
}

.btn:active:not(:disabled) {
  transform: scale(0.98);
}

.btn-block {
  width: 100%;
}

/* Como "Finalizar test" del formulario */
.btn-primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  box-shadow: var(--shadow-button);
}

/* Como "Guardar borrador" del formulario */
.btn-secondary {
  background: #fff;
  border-color: #d1d5db;
  color: var(--color-text);
}

.btn-secondary:hover:not(:disabled) {
  background: #f9fafb;
  border-color: #9ca3af;
}

.btn:disabled {
  cursor: not-allowed;
}

.btn-secondary:disabled {
  color: #9ca3af;
  background: #f9fafb;
}

.btn-link {
  min-height: 44px;
  background: none;
  color: var(--color-ink);
  font-weight: 600;
  box-shadow: none;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s;
}

.btn-link:hover {
  text-decoration-color: currentColor;
}

.btn-small {
  min-height: 40px;
  padding: 0 14px;
  font-size: 13px;
}

.btn-countdown {
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}

.btn-spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: var(--radius-round);
  animation: spin 0.7s linear infinite;
}

.btn.is-loading {
  pointer-events: none;
}

.btn.is-loading .btn-spinner {
  display: inline-block;
}

.btn.is-loading .btn-icon {
  display: none;
}

.btn-primary.is-loading {
  background: var(--color-primary-hover);
}

/* ===== Solo para lectores de pantalla ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== Cabecera del portal ===== */
.app-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-divider);
}

/* Como el título del formulario: logo + texto en mayúsculas espaciadas */
.portal-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink);
  text-decoration: none;
}

.portal-brand img {
  width: auto;
  height: 32px;
  object-fit: contain;
}

.logout-btn {
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .app-header {
    padding: 12px 24px;
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}