.lmc-calculator {
	--lmc-navy: #0b1526;
	--lmc-panel: #142238;
	--lmc-panel-hover: #1b2c47;
	--lmc-border: #223452;
	--lmc-text-soft: #7c8aa6;
	--lmc-teal: #2dd4bf;
	--lmc-teal-deep: #26b3a1;
	--lmc-cell-size: 52px;

	max-width: 480px;
	margin: 24px 0;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
	box-sizing: border-box;
}

.lmc-calculator *,
.lmc-calculator *::before,
.lmc-calculator *::after {
	box-sizing: inherit;
}

.lmc-panel {
	background: var(--lmc-navy);
	border: 1px solid var(--lmc-border);
	border-radius: 18px;
	overflow: hidden;
	box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.lmc-header {
	display: flex;
	align-items: center;
	gap: 10px;
	padding: 18px 22px;
	border-bottom: 1px solid var(--lmc-border);
}

.lmc-header-icon {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 26px;
	height: 26px;
	border-radius: 50%;
	border: 1.5px solid var(--lmc-teal);
	color: var(--lmc-teal);
	font-size: 15px;
	font-weight: 700;
	flex-shrink: 0;
}

.lmc-heading {
	margin: 0;
	font-size: 16px;
	font-weight: 700;
	color: #ffffff;
	letter-spacing: -0.01em;
}

.lmc-body {
	padding: 20px 22px 22px;
}

.lmc-field-row {
	display: flex;
	align-items: flex-end;
	gap: 10px;
}

.lmc-field {
	flex: 1;
	min-width: 0;
}

.lmc-times {
	padding-bottom: 12px;
	color: var(--lmc-text-soft);
	font-weight: 700;
	font-size: 16px;
}

.lmc-label {
	display: block;
	font-size: 11px;
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--lmc-text-soft);
	margin-bottom: 8px;
}

.lmc-input {
	width: 100%;
	padding: 12px 14px;
	font-size: 14px;
	font-family: inherit;
	font-variant-numeric: tabular-nums;
	border: none;
	background: #ffffff;
	border-radius: 10px;
	color: var(--lmc-navy);
	transition: box-shadow 0.15s ease;
}

.lmc-input::placeholder {
	color: #9aa4b5;
}

.lmc-input:focus {
	outline: none;
	box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.45);
}

.lmc-example-note {
	margin: 8px 0 0;
	font-size: 11.5px;
	font-style: italic;
	color: var(--lmc-teal);
}

.lmc-button-row {
	display: flex;
	gap: 10px;
	margin-top: 18px;
}

.lmc-btn {
	flex: 1;
	padding: 12px 18px;
	font-size: 14px;
	font-weight: 700;
	font-family: inherit;
	border: none;
	border-radius: 10px;
	cursor: pointer;
	transition: background 0.15s ease, transform 0.05s ease;
}

.lmc-btn-primary {
	background: var(--lmc-teal);
	color: #06231f;
}

.lmc-btn-primary:hover {
	background: var(--lmc-teal-deep);
}

.lmc-btn-ghost {
	background: var(--lmc-panel);
	color: #ffffff;
	border: 1px solid var(--lmc-border);
}

.lmc-btn-ghost:hover {
	background: var(--lmc-panel-hover);
}

.lmc-btn:active {
	transform: translateY(1px);
}

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

.lmc-error {
	min-height: 16px;
	margin: 12px 0 0;
	font-size: 13px;
	font-weight: 600;
	color: #ff9d8a;
}

/* Results */
.lmc-results:not(.has-result) {
	display: none;
}

.lmc-answer-box {
	text-align: center;
	margin-top: 22px;
	padding: 16px;
	background: var(--lmc-panel);
	border: 1px solid var(--lmc-border);
	border-radius: 12px;
}

.lmc-answer-label {
	display: block;
	font-size: 10px;
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	color: var(--lmc-text-soft);
	margin-bottom: 8px;
}

.lmc-answer-value {
	display: block;
	font-size: 30px;
	font-weight: 800;
	font-variant-numeric: tabular-nums;
	letter-spacing: -0.02em;
	color: var(--lmc-teal);
}

/* Solution */
.lmc-solution {
	margin-top: 22px;
}

.lmc-section-title {
	margin: 0 0 14px;
	font-size: 13px;
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.04em;
	color: var(--lmc-text-soft);
}

.lmc-section-title-spaced {
	margin-top: 22px;
}

.lmc-step-hint {
	margin: -8px 0 14px;
	font-size: 12px;
	color: var(--lmc-text-soft);
}

/* Lattice grid */
.lmc-grid-scroll {
	overflow-x: auto;
	-webkit-overflow-scrolling: touch;
	padding-bottom: 4px;
}

.lmc-lattice {
	display: inline-grid;
	gap: 3px;
	background: var(--lmc-border);
	padding: 3px;
	border-radius: 10px;
}

.lmc-topdigit,
.lmc-sidedigit {
	display: flex;
	align-items: center;
	justify-content: center;
	width: var(--lmc-cell-size);
	height: var(--lmc-cell-size);
	font-size: 16px;
	font-weight: 700;
	color: var(--lmc-teal);
	background: var(--lmc-navy);
}

.lmc-cell {
	position: relative;
	width: var(--lmc-cell-size);
	height: var(--lmc-cell-size);
	background: var(--lmc-panel);
	overflow: hidden;
}

.lmc-cell::before {
	content: '';
	position: absolute;
	inset: 0;
	background: linear-gradient(
		to bottom right,
		transparent calc(50% - 0.75px),
		var(--lmc-teal) calc(50% - 0.75px),
		var(--lmc-teal) calc(50% + 0.75px),
		transparent calc(50% + 0.75px)
	);
	opacity: 0.55;
}

.lmc-cell-tens,
.lmc-cell-units {
	position: absolute;
	font-size: 13px;
	font-weight: 600;
	font-variant-numeric: tabular-nums;
	color: #ffffff;
}

.lmc-cell-tens {
	top: 3px;
	left: 5px;
}

.lmc-cell-units {
	bottom: 3px;
	right: 5px;
}

/* Diagonal sum steps */
.lmc-band-line {
	display: flex;
	align-items: flex-start;
	gap: 10px;
	margin-bottom: 10px;
	font-size: 13px;
}

.lmc-band-num {
	flex: 0 0 auto;
	width: 20px;
	height: 20px;
	border-radius: 50%;
	background: var(--lmc-teal);
	color: #06231f;
	font-size: 11px;
	font-weight: 800;
	display: flex;
	align-items: center;
	justify-content: center;
	margin-top: 1px;
}

.lmc-band-text {
	flex: 1;
	color: var(--lmc-text-soft);
	font-variant-numeric: tabular-nums;
	line-height: 1.5;
}

.lmc-band-text strong {
	color: #ffffff;
}

.lmc-band-digit {
	color: var(--lmc-teal) !important;
}

@media (max-width: 420px) {
	.lmc-calculator {
		--lmc-cell-size: 42px;
	}
}

@media (prefers-reduced-motion: reduce) {
	.lmc-btn {
		transition: none;
	}
}