/*
 * Button — primary, secondary, ghost, destructive.
 * Sizes: default (36px), small (28px), large (44px).
 */

@import url('../tokens.css');

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 36px;
  padding: 0 var(--space-4);
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  transition:
    background-color var(--transition),
    border-color var(--transition),
    color var(--transition),
    box-shadow var(--transition);
  user-select: none;
}

.btn:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-outline-offset);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-icon {
  width: var(--icon-sm);
  height: var(--icon-sm);
  flex-shrink: 0;
}

/* ---------- Sizes ---------- */

.btn-sm {
  height: 28px;
  padding: 0 var(--space-3);
  font-size: var(--text-tiny);
}

.btn-lg {
  height: 44px;
  padding: 0 var(--space-5);
  font-size: var(--text-body-strong);
}

/* ---------- Variants ---------- */

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-primary-foreground);
  border-color: var(--color-primary);
}

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

.btn-primary:active {
  background-color: var(--color-primary-active);
  border-color: var(--color-primary-active);
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-surface-muted);
  border-color: var(--color-border-strong);
}

.btn-secondary:active {
  background-color: var(--color-surface-muted);
  border-color: var(--color-border-strong);
}

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

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

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

.btn-destructive {
  background-color: var(--color-surface);
  color: var(--color-danger);
  border-color: var(--color-danger);
}

.btn-destructive:hover {
  background-color: var(--color-danger-soft);
}

.btn-destructive:active {
  background-color: var(--color-danger-soft);
}

/* ---------- Icon-only variant ---------- */

.btn-icon-only {
  width: 36px;
  padding: 0;
  border-radius: var(--radius-pill);
}

.btn-icon-only.btn-sm {
  width: 28px;
}

.btn-icon-only.btn-lg {
  width: 44px;
}

.btn-icon-only .btn-icon {
  width: var(--icon);
  height: var(--icon);
}

/* --- Loading / processing state (submit-loading.js) --- */
.btn.is-loading {
  cursor: progress;
  pointer-events: none;
}
.btn.is-loading > span:last-child {
  opacity: 0.9;
}
.btn-spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  margin-right: 6px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  vertical-align: -2px;
  animation: btn-spin 0.6s linear infinite;
}
@keyframes btn-spin {
  to { transform: rotate(360deg); }
}
@media (prefers-reduced-motion: reduce) {
  .btn-spinner { animation-duration: 1.5s; }
}