.auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: linear-gradient(180deg, var(--color-bg) 0%, #f0ebe0 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  animation: fadeIn var(--duration) var(--ease);
}

.auth-overlay::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 200'><path d='M0,150 Q50,120 100,140 T200,130 L200,200 L0,200 Z' fill='%232d4a3e' opacity='0.04'/></svg>");
  background-size: cover;
  pointer-events: none;
}

.auth-card {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-6);
  max-width: 400px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  text-align: center;
  border-top: 3px solid var(--color-accent);
}

.auth-card__title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-2);
}

.auth-card__subtitle {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-6);
}

.auth-card__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.auth-card__input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-divider);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  background: var(--color-bg);
  transition: border-color var(--duration-fast) var(--ease);
  text-align: center;
  letter-spacing: 0.2em;
}
.auth-card__input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.auth-card__submit {
  padding: var(--space-3) var(--space-5);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: 500;
  transition: background var(--duration-fast) var(--ease);
}
.auth-card__submit:hover { background: var(--color-primary-light); }

.auth-card__error {
  color: var(--color-error);
  font-size: var(--text-sm);
  min-height: 1.4em;
}

.auth-card.shake { animation: shake 0.4s var(--ease); }
.auth-card.shake .auth-card__input { border-color: var(--color-error); }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

main[hidden] { display: none; }