.frtc-widget {
	width: var(--frtc-width, 380px);
	height: var(--frtc-height, auto);
	box-sizing: border-box;
	border: 1px solid var(--frtc-border, #e5e7eb);
	border-radius: var(--frtc-radius, 16px);
	background: var(--frtc-bg, #ffffff);
	color: var(--frtc-text, #111827);
	box-shadow: var(--frtc-shadow, none);
	font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
	padding: 16px;
	display: flex;
	flex-direction: column;
	gap: 12px;
}

.frtc-header {
	display: flex;
	justify-content: space-between;
	align-items: baseline;
	gap: 10px;
}

.frtc-title {
	font-size: 16px;
	font-weight: 750;
	letter-spacing: 0.2px;
}

.frtc-subtitle {
	font-size: 12px;
	color: var(--frtc-muted, #6b7280);
	white-space: nowrap;
}

.frtc-body {
	display: grid;
	grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
	gap: 12px;
	flex: 1 1 auto;
	min-height: 0;
	overflow: auto;
}

.frtc-left,
.frtc-right {
	min-width: 0;
}

.frtc-mode {
	display: flex;
	gap: 8px;
	align-items: center;
	justify-content: flex-start;
	margin-bottom: 10px;
}

.frtc-mode-option {
	display: inline-flex;
	gap: 8px;
	align-items: center;
	padding: 8px 10px;
	border: 1px solid var(--frtc-border, #e5e7eb);
	border-radius: 999px;
	background: #ffffff;
	font-size: 12px;
	color: var(--frtc-text, #111827);
	user-select: none;
}

.frtc-mode-option input {
	margin: 0;
}

.frtc-grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 10px;
	background: var(--frtc-surface, #f7f8fa);
	border: 1px solid var(--frtc-border, #e5e7eb);
	border-radius: calc(var(--frtc-radius, 16px) - 6px);
	padding: 12px;
	box-sizing: border-box;
}

.frtc-cell {
	display: flex;
	flex-direction: column;
	gap: 6px;
	min-width: 0;
}

.frtc-label {
	font-size: 12px;
	color: var(--frtc-muted, #6b7280);
	font-weight: 650;
}

.frtc-input {
	width: 100%;
	box-sizing: border-box;
	border: 1px solid var(--frtc-border, #e5e7eb);
	border-radius: 12px;
	padding: 10px 10px;
	background: #ffffff;
	color: var(--frtc-text, #111827);
	font-size: 14px;
	outline: none;
}

/* Remove number input spinners (the user types values directly). */
.frtc-input[type="number"]::-webkit-outer-spin-button,
.frtc-input[type="number"]::-webkit-inner-spin-button {
	-webkit-appearance: none;
	margin: 0;
}

.frtc-input[type="number"] {
	-moz-appearance: textfield;
}

.frtc-input:focus {
	border-color: var(--frtc-accent, #2563eb);
	box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.06);
}

.frtc-result {
	border: 1px dashed var(--frtc-border, #e5e7eb);
	border-radius: 12px;
	padding: 10px;
	background: rgba(0, 0, 0, 0.02);
	min-height: 42px;
	display: flex;
	align-items: center;
	justify-content: center;
	box-sizing: border-box;
}

.frtc-result .frtc-x {
	font-size: 16px;
	font-weight: 800;
	color: var(--frtc-accent, #2563eb);
}

.frtc-hint {
	margin-top: 8px;
	font-size: 12px;
	color: var(--frtc-muted, #6b7280);
}

.frtc-panel {
	background: var(--frtc-surface, #f7f8fa);
	border: 1px solid var(--frtc-border, #e5e7eb);
	border-radius: calc(var(--frtc-radius, 16px) - 6px);
	padding: 12px;
	box-sizing: border-box;
	height: 100%;
	display: flex;
	flex-direction: column;
	gap: 10px;
}

.frtc-panel-title {
	font-weight: 800;
	font-size: 13px;
	letter-spacing: 0.2px;
}

.frtc-panel-text {
	margin: 0;
	font-size: 12px;
	color: var(--frtc-muted, #6b7280);
	line-height: 1.45;
}

.frtc-formula {
	font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
	font-size: 12px;
	border: 1px solid var(--frtc-border, #e5e7eb);
	border-radius: 12px;
	padding: 10px;
	background: #ffffff;
	box-sizing: border-box;
}

.frtc-formula-line {
	margin: 0;
}

.frtc-formula-dynamic {
	margin-top: 8px;
	color: var(--frtc-muted, #6b7280);
}

.frtc-note {
	font-size: 12px;
	color: var(--frtc-muted, #6b7280);
}

.frtc-footer {
	display: flex;
	justify-content: flex-end;
	font-size: 11px;
	line-height: 1;
}

.frtc-footer-link {
	color: var(--frtc-muted, #6b7280);
	text-decoration: none;
}

.frtc-footer-link:hover,
.frtc-footer-link:focus {
	color: var(--frtc-text, #111827);
	text-decoration: underline;
}

@media (max-width: 560px) {
	.frtc-widget {
		width: 100%;
	}

	.frtc-body {
		grid-template-columns: 1fr;
	}
}