/* Buttons -see docs/strategy/design-system/10-button.md */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  padding: var(--space-2) var(--space-3);
  min-height: 34px;
  font-weight: 600;
  font-size: var(--font-size-caption);
  cursor: pointer;
  color: var(--text);
  font-family: var(--font);
  text-decoration: none;
  transition: background var(--duration-base) var(--ease-standard), color var(--duration-base) var(--ease-standard),
              border-color var(--duration-base) var(--ease-standard), box-shadow var(--duration-base) var(--ease-standard),
              transform var(--duration-instant) var(--ease-standard);
}

.btn:hover:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy) {
  box-shadow: var(--shadow-sm);
}

.btn:active:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy) {
  transform: translateY(1px);
}

.btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

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

.btn.primary:hover:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy),
a:hover > .btn.primary:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy),
a:focus-visible > .btn.primary:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy) {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
}

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

.btn.outline:hover:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy),
a:hover > .btn.outline:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy),
a:focus-visible > .btn.outline:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy) {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary-dark);
}

.btn.ghost {
  background: var(--surface-soft);
  border-color: var(--divider);
  color: var(--muted);
}

.btn.ghost:hover:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy),
a:hover > .btn.ghost:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy),
a:focus-visible > .btn.ghost:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy) {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}

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

.btn.danger:hover:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy),
a:hover > .btn.danger:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy),
a:focus-visible > .btn.danger:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy) {
  background: var(--error-dark);
  border-color: var(--error-dark);
}

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

.btn.success:hover:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy),
a:hover > .btn.success:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy),
a:focus-visible > .btn.success:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy) {
  background: var(--success-dark);
  border-color: var(--success-dark);
}

.btn.pro {
  background: var(--admin-accent);
  border-color: var(--admin-accent);
  color: var(--surface);
}

.btn.pro:hover:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy),
a:hover > .btn.pro:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy),
a:focus-visible > .btn.pro:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy) {
  background: var(--admin-accent-dark);
  border-color: var(--admin-accent-dark);
}

.btn:hover:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy):not(.primary):not(.outline):not(.ghost):not(.danger):not(.success):not(.pro):not(.on-dark-primary):not(.on-dark-outline),
a:hover > .btn:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy):not(.primary):not(.outline):not(.ghost):not(.danger):not(.success):not(.pro):not(.on-dark-primary):not(.on-dark-outline),
a:focus-visible > .btn:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy):not(.primary):not(.outline):not(.ghost):not(.danger):not(.success):not(.pro):not(.on-dark-primary):not(.on-dark-outline) {
  background: var(--surface-soft);
  border-color: var(--border);
}

.btn.disabled,
.btn:disabled,
.btn[aria-disabled="true"],
.btn.is-busy {
  opacity: 0.62;
  cursor: not-allowed;
}

.btn:disabled,
.btn.is-busy {
  pointer-events: none;
}

.btn.sm,
.btn.btn-sm {
  min-height: 30px;
  padding: 6px 10px;
  font-size: var(--font-size-small);
}

.btn.btn-lg {
  min-height: 42px;
  padding: 0 24px;
  font-size: var(--font-size-prominent);
  letter-spacing: var(--letter-spacing-prominent);
  font-weight: 700;
}

.btn.full {
  width: 100%;
}

/* Spinner sub-element inside a submit button. Hidden by default;
   revealed when the parent form gains [data-submit-state-busy="1"]
   (set by static/ui/js/auth/submit-state.js on submit). The SVG
   inherits color from the button (.btn.primary -> --surface white;
   .btn.outline -> --primary; etc.) via stroke="currentColor". */
.btn .spinner {
  display: none;
  width: 16px;
  height: 16px;
  margin-right: var(--space-2);
}

.btn .spinner svg {
  width: 100%;
  height: 100%;
  animation: btn-spin 0.8s linear infinite;
}

form[data-submit-state-busy="1"] button[type="submit"] .spinner {
  display: inline-flex;
}

@keyframes btn-spin {
  to { transform: rotate(360deg); }
}

.btn.on-dark-primary {
  background: var(--surface);
  border-color: var(--surface);
  color: var(--primary-dark);
  box-shadow: var(--shadow-sm);
}

.btn.on-dark-primary:hover:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy) {
  background: var(--surface-soft);
  border-color: var(--surface-soft);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.btn.on-dark-primary:active:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy) {
  transform: translateY(1px);
  box-shadow: var(--shadow-sm);
}

.btn.on-dark-outline {
  background: transparent;
  border: 1.5px solid var(--on-dark-50);
  color: var(--on-dark-90);
}

.btn.on-dark-outline:hover:not(:disabled):not(.disabled):not([aria-disabled="true"]):not(.is-busy) {
  background: var(--on-dark-25);
  border-color: var(--on-dark-75);
  box-shadow: none;
}