/* A4AC Tuning Reference — scoped styles, themed via WikiPress custom
   properties with standalone fallbacks. */

.a4ac-tuner,
.a4ac-tuner *,
.a4ac-tuner *::before,
.a4ac-tuner *::after {
	box-sizing: border-box;
}

.a4ac-tuner {
	--a4ac-primary: var(--wikipress-primary, #0645ad);
	--a4ac-text: var(--wikipress-text, #202122);
	--a4ac-text-light: var(--wikipress-text-light, #54595d);
	--a4ac-border: var(--wikipress-border, #a2a9b1);
	--a4ac-border-light: var(--wikipress-border-light, #eaecf0);
	--a4ac-bg: var(--wikipress-bg, #ffffff);
	--a4ac-bg-off: var(--wikipress-bg-off, #f8f9fa);
	--a4ac-font-ui: var(--wikipress-font-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif);

	font-family: var(--a4ac-font-ui);
	color: var(--a4ac-text);
	border: 1px solid var(--a4ac-border-light);
	border-radius: 6px;
	background: var(--a4ac-bg);
	padding: 20px;
	margin: 1.5em 0;
}

/* ---- Controls ---- */
.a4ac-tn-label {
	display: block;
	font-size: 0.8em;
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--a4ac-text-light);
	margin-bottom: 6px;
}

.a4ac-tn-select {
	font-family: var(--a4ac-font-ui);
	font-size: 1em;
	padding: 8px 10px;
	border: 1px solid var(--a4ac-border);
	border-radius: 4px;
	background: var(--a4ac-bg-off);
	color: var(--a4ac-text);
	max-width: 100%;
}

.a4ac-tn-select:focus-visible {
	outline: 2px solid var(--a4ac-primary);
	outline-offset: 2px;
}

.a4ac-tn-desc {
	margin: 8px 0 0;
	color: var(--a4ac-text-light);
	font-size: 0.92em;
}

/* ---- String buttons ---- */
.a4ac-tn-strings {
	display: grid;
	grid-template-columns: repeat(6, 1fr);
	gap: 8px;
	margin: 18px 0 14px;
}

.a4ac-tn-string {
	font-family: var(--a4ac-font-ui);
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 3px;
	padding: 12px 4px;
	border: 1px solid var(--a4ac-border);
	border-radius: 6px;
	background: var(--a4ac-bg-off);
	color: var(--a4ac-text);
	cursor: pointer;
	transition: background-color 0.12s ease;
}

.a4ac-tn-string:hover {
	background: var(--a4ac-border-light);
}

.a4ac-tn-string:focus-visible {
	outline: 2px solid var(--a4ac-primary);
	outline-offset: 2px;
}

.a4ac-tn-string.is-active {
	background: var(--a4ac-primary);
	border-color: var(--a4ac-primary);
	color: #fff;
}

.a4ac-tn-string.is-active .a4ac-tn-string-num,
.a4ac-tn-string.is-active .a4ac-tn-string-freq {
	color: rgba(255, 255, 255, 0.8);
}

.a4ac-tn-string-num {
	font-size: 0.72em;
	color: var(--a4ac-text-light);
}

.a4ac-tn-string-note {
	font-size: 1.25em;
	font-weight: 700;
}

.a4ac-tn-string-freq {
	font-size: 0.72em;
	color: var(--a4ac-text-light);
	white-space: nowrap;
}

/* ---- Actions ---- */
.a4ac-tn-actions {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 10px;
}

.a4ac-tn-mode {
	display: inline-flex;
	gap: 0;
}

.a4ac-tn-mode .a4ac-tn-action:first-child {
	border-radius: 4px 0 0 4px;
}

.a4ac-tn-mode .a4ac-tn-action:last-child {
	border-radius: 0 4px 4px 0;
	border-left: none;
}

.a4ac-tn-action {
	font-family: var(--a4ac-font-ui);
	font-size: 0.9em;
	padding: 9px 14px;
	border: 1px solid var(--a4ac-border);
	border-radius: 4px;
	background: var(--a4ac-bg-off);
	color: var(--a4ac-text);
	cursor: pointer;
}

.a4ac-tn-action:hover {
	background: var(--a4ac-border-light);
}

.a4ac-tn-action:focus-visible {
	outline: 2px solid var(--a4ac-primary);
	outline-offset: 2px;
}

.a4ac-tn-action.is-active {
	background: var(--a4ac-primary);
	border-color: var(--a4ac-primary);
	color: #fff;
	font-weight: 600;
}

.a4ac-tn-note {
	font-size: 0.82em;
	color: var(--a4ac-text-light);
	margin: 12px 0 0;
}

/* ---- Small screens ---- */
@media (max-width: 560px) {
	.a4ac-tuner {
		padding: 14px;
	}

	.a4ac-tn-strings {
		grid-template-columns: repeat(3, 1fr);
	}
}