/* ==========================================================================
   Buttons & Interactive Controls
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font-family: inherit;
  font-size: 0.825rem;
  font-weight: 600;
  padding: 0.5rem 0.9rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
  white-space: nowrap;
}

.btn:hover {
  background-color: var(--bg-elevated);
  border-color: var(--border-strong);
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #ffffff;
  border-color: transparent;
}

[data-theme="dark"] .btn-primary,
[data-theme="espresso"] .btn-primary,
[data-theme="pine"] .btn-primary {
  color: #091312;
}

.btn-primary:hover {
  background-color: var(--accent-primary-hover);
  border-color: transparent;
}

.btn-sm {
  font-size: 0.75rem;
  padding: 0.32rem 0.65rem;
  border-radius: 0.4rem;
}

.icon-btn {
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border-radius: 0.5rem;
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .btn-sm,
  .month-step-btn,
  .modal-close-btn,
  .header-period-step,
  .month-nav-arrow,
  .icon-btn {
    min-height: 40px;
  }
}