/* ============================================
   BUTTON COMPONENT
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 1.125rem;
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  line-height: 1;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: all var(--t-fast) var(--ease-out);
  position: relative;
}

.btn:active {
  transform: scale(0.97);
}

.btn:disabled {
  opacity: 0.5;
  pointer-events: none;
}

/* ===== Variants ===== */
.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-text-on-primary);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05) inset, 0 2px 6px rgba(13, 124, 77, 0.25);
}

.btn--primary:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05) inset, 0 6px 16px rgba(13, 124, 77, 0.32);
}

.btn--accent {
  background-color: var(--color-accent);
  color: #ffffff;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05) inset, 0 2px 6px rgba(255, 122, 26, 0.3);
}

.btn--accent:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text);
}

.btn--ghost:hover {
  background-color: var(--color-surface-hover);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ===== Sizes ===== */
.btn--sm {
  padding: 0.4rem 0.85rem;
  font-size: var(--fs-xs);
}

.btn--lg {
  padding: 0.85rem 1.5rem;
  font-size: var(--fs-md);
}

.btn--icon {
  padding: 0.5rem;
  width: 40px;
  height: 40px;
}

/* ===== Icon-only round button (theme toggle, etc.) ===== */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  background-color: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--t-fast) var(--ease-out);
  border: 1px solid transparent;
}

.icon-btn:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-text);
  border-color: var(--color-border);
}

.icon-btn:active {
  transform: scale(0.92);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}