/**
 * Buttons — solid / outline / ghost hierarchy per approved-v1 references.
 * States: default, hover, focus-visible, active, disabled, loading.
 */

.nbf-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: var(--nbf-space-2);
	min-block-size: var(--nbf-control-h);
	min-inline-size: var(--nbf-tap-target);
	padding-block: var(--nbf-space-2);
	padding-inline: var(--nbf-space-6);
	border: 1px solid transparent;
	border-radius: var(--nbf-radius-md);
	font-size: var(--nbf-fs-md);
	font-weight: var(--nbf-fw-bold);
	line-height: var(--nbf-lh-tight);
	text-decoration: none;
	cursor: pointer;
	user-select: none;
	transition:
		background-color var(--nbf-duration) var(--nbf-ease),
		border-color var(--nbf-duration) var(--nbf-ease),
		color var(--nbf-duration) var(--nbf-ease),
		box-shadow var(--nbf-duration) var(--nbf-ease);
}

a.nbf-btn:hover {
	text-decoration: none;
}

/* --- Primary (solid blue) --- */
.nbf-btn--primary {
	background: var(--nbf-color-primary-600);
	color: var(--nbf-color-text-inverse);
	box-shadow: var(--nbf-shadow-sm);
}

.nbf-btn--primary:hover {
	background: var(--nbf-color-primary-700);
}

.nbf-btn--primary:active {
	background: var(--nbf-color-primary-800);
	box-shadow: none;
}

/* --- Secondary (outline) --- */
.nbf-btn--secondary {
	background: var(--nbf-color-surface);
	color: var(--nbf-color-primary-600);
	border-color: var(--nbf-color-primary-300);
}

.nbf-btn--secondary:hover {
	background: var(--nbf-color-primary-50);
	border-color: var(--nbf-color-primary-500);
}

.nbf-btn--secondary:active {
	background: var(--nbf-color-primary-100);
}

/* --- Ghost (borderless, quiet) --- */
.nbf-btn--ghost {
	background: transparent;
	color: var(--nbf-color-primary-600);
}

.nbf-btn--ghost:hover {
	background: var(--nbf-color-primary-50);
}

.nbf-btn--ghost:active {
	background: var(--nbf-color-primary-100);
}

/* --- On-navy inverse (CTA banners, dark bars) --- */
.nbf-btn--inverse {
	background: var(--nbf-color-surface);
	color: var(--nbf-color-primary-700);
}

.nbf-btn--inverse:hover {
	background: var(--nbf-color-primary-50);
}

/* --- Danger --- */
.nbf-btn--danger {
	background: var(--nbf-color-error);
	color: var(--nbf-color-text-inverse);
}

.nbf-btn--danger:hover {
	background: #b92e3f;
}

/* --- Sizes --- */
.nbf-btn--sm {
	min-block-size: var(--nbf-control-h-sm);
	padding-inline: var(--nbf-space-4);
	font-size: var(--nbf-fs-sm);
	border-radius: var(--nbf-radius-sm);
}

.nbf-btn--lg {
	min-block-size: 3.25rem;
	padding-inline: var(--nbf-space-8);
	font-size: var(--nbf-fs-lg);
}

.nbf-btn--block {
	inline-size: 100%;
}

.nbf-btn--pill {
	border-radius: var(--nbf-radius-pill);
}

/* --- Icon-only button (header actions, steppers) --- */
.nbf-icon-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	inline-size: var(--nbf-tap-target);
	block-size: var(--nbf-tap-target);
	padding: 0;
	border: 1px solid var(--nbf-color-border);
	border-radius: var(--nbf-radius-md);
	background: var(--nbf-color-surface);
	color: var(--nbf-color-text);
	cursor: pointer;
	transition:
		background-color var(--nbf-duration) var(--nbf-ease),
		border-color var(--nbf-duration) var(--nbf-ease),
		color var(--nbf-duration) var(--nbf-ease);
}

.nbf-icon-btn:hover {
	background: var(--nbf-color-primary-50);
	border-color: var(--nbf-color-primary-300);
	color: var(--nbf-color-primary-600);
}

.nbf-icon-btn:active {
	background: var(--nbf-color-primary-100);
}

.nbf-icon-btn--round {
	border-radius: var(--nbf-radius-pill);
}

.nbf-icon-btn--primary {
	background: var(--nbf-color-primary-600);
	border-color: var(--nbf-color-primary-600);
	color: var(--nbf-color-text-inverse);
}

.nbf-icon-btn--primary:hover {
	background: var(--nbf-color-primary-700);
	border-color: var(--nbf-color-primary-700);
	color: var(--nbf-color-text-inverse);
}

/* --- Disabled (both real and aria-disabled) --- */
.nbf-btn:disabled,
.nbf-btn[aria-disabled="true"],
.nbf-icon-btn:disabled,
.nbf-icon-btn[aria-disabled="true"] {
	background: var(--nbf-color-surface-sunken);
	border-color: var(--nbf-color-border);
	color: var(--nbf-color-text-3);
	box-shadow: none;
	cursor: not-allowed;
	pointer-events: none;
}

/* --- Loading --- */
.nbf-btn--loading {
	position: relative;
	color: transparent !important;
	pointer-events: none;
}

.nbf-btn--loading::after {
	content: "";
	position: absolute;
	inline-size: 1.25em;
	block-size: 1.25em;
	inset-block-start: calc(50% - 0.625em);
	inset-inline-start: calc(50% - 0.625em);
	border: 2px solid rgb(255 255 255 / 0.4);
	border-block-start-color: #fff;
	border-radius: 50%;
	animation: nbf-spin 0.7s linear infinite;
}

.nbf-btn--secondary.nbf-btn--loading::after,
.nbf-btn--ghost.nbf-btn--loading::after {
	border-color: var(--nbf-color-primary-200);
	border-block-start-color: var(--nbf-color-primary-600);
}

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

@media (prefers-reduced-motion: reduce) {
	.nbf-btn--loading::after {
		animation-duration: 1.5s !important;
		animation-iteration-count: infinite !important;
	}
}