.auth-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
}

.auth-shell__intro {
  background: linear-gradient(160deg, var(--color-azul-cognitivo), #0a2438 120%);
  color: #fff;
  padding: var(--space-8) var(--space-7);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.auth-shell__intro::after {
  content: '';
  position: absolute;
  right: -100px;
  bottom: -120px;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.auth-shell__intro::before {
  content: '';
  position: absolute;
  right: 20px;
  bottom: 20px;
  width: 210px;
  height: 210px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.auth-shell__intro-inner { position: relative; z-index: 1; }

.auth-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.3rem;
}

.auth-brand-mark {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-shell__tagline {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 1.3rem + 1vw, 2.1rem);
  letter-spacing: -0.01em;
  max-width: 20ch;
  margin: var(--space-6) 0 var(--space-3);
}

.auth-shell__note {
  color: var(--color-azul-ceu);
  max-width: 40ch;
}

.auth-feature-list {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: relative;
  z-index: 1;
}
.auth-feature-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.92rem;
}
.auth-feature-list .icon-badge {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.12);
  color: var(--color-azul-ceu);
}

.auth-shell__form {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  background: var(--color-bg);
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  padding: var(--space-7) var(--space-6);
}

.auth-card h1 { margin-bottom: var(--space-2); }
.auth-card p.lead { color: var(--color-text-muted); margin-bottom: var(--space-6); }

.auth-card__footer {
  margin-top: var(--space-6);
  text-align: center;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

@media (max-width: 860px) {
  .auth-shell { grid-template-columns: 1fr; }
  .auth-shell__intro { display: none; }
  .auth-shell__form { padding: var(--space-4); }
}