.rsvp {
  text-align: center;
  padding-bottom: 3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 14rem;
  margin-top: 0.6rem;
  padding: 0.95rem 1.4rem;
  border-radius: 999px;
  background: var(--charcoal);
  color: #fffdf8;
  text-decoration: none;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition:
    transform 0.28s cubic-bezier(0.16, 1, 0.3, 1),
    background 0.28s ease,
    box-shadow 0.28s ease,
    color 0.28s ease;
  box-shadow: 0 10px 24px rgba(63, 63, 64, 0.22);
  cursor: pointer;
}

.btn--hero {
  margin-top: 1.25rem;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-3px) scale(1.02);
  background: var(--brown);
  color: #fffdf8;
  box-shadow:
    0 16px 32px rgba(75, 43, 18, 0.28),
    0 0 0 4px color-mix(in srgb, var(--pink) 45%, transparent);
  outline: none;
}

.btn:active {
  transform: translateY(-1px) scale(0.99);
  background: #3a210e;
  box-shadow: 0 8px 18px rgba(63, 63, 64, 0.2);
}

.btn.is-disabled {
  opacity: 0.55;
}

.btn.is-disabled:hover,
.btn.is-disabled:focus-visible {
  transform: none;
  background: var(--charcoal);
  box-shadow: 0 10px 24px rgba(63, 63, 64, 0.22);
  cursor: not-allowed;
}

.rsvp__hint {
  margin-top: 0.9rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.rsvp__hint code {
  font-size: 0.8em;
}