.brand-mark {
	display: grid;
	width: 47px;
	height: 47px;
	place-items: center;
	color: var(--ink);
	background: var(--mint);
	border: 1px solid #b6d9cd;
	border-radius: 15px 15px 15px 4px;
	font-family: 'Gowun Batang', serif;
	font-size: 25px;
	box-shadow: 5px 5px 0 #c3e3d7;
}

.eyebrow {
	margin: 0 0 3px;
	color: var(--mint-strong);
	font-size: 11px;
	font-weight: 800;
	letter-spacing: .16em;
}

h1 {
	margin: 0;
	font-family: 'Gowun Batang', serif;
	font-size: clamp(28px, 4vw, 42px);
	line-height: 1;
	letter-spacing: -.06em;
}

.icon-button, .outline-button {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	height: 42px;
	padding: 0 15px;
	color: var(--ink);
	background: rgba(255, 253, 248, .7);
	border: 1px solid var(--line);
	border-radius: 10px;
	font-size: 12px;
	font-weight: 800;
	transition: .2s ease;
}

.icon-button:hover, .outline-button:hover {
	border-color: var(--mint-strong);
	background: white;
	transform: translateY(-1px);
}

.top-actions a {
	text-decoration: none;
}

.game-panel {
	padding: 25px;
	background: rgba(255, 253, 248, .84);
	border: 1px solid rgba(159, 181, 180, .55);
	border-radius: 22px;
	box-shadow: var(--shadow);
	backdrop-filter: blur(8px);
}

.game-head h2 {
	margin: 0;
	font-family: 'Gowun Batang', serif;
	font-size: 23px;
}

.game-head p {
	margin: 5px 0 0;
	color: var(--muted);
	font-size: 12px;
}

select {
	height: 37px;
	padding: 0 29px 0 11px;
	color: var(--ink);
	background: var(--mint);
	border: 0;
	border-radius: 8px;
	font-size: 12px;
	font-weight: 800;
	outline: 0;
}

html[data-difficulty="easy"] {
	--difficulty-accent: #5279a8;
	--difficulty-soft: #e2ebf6;
}

html[data-difficulty="medium"] {
	--difficulty-accent: #4b9d80;
	--difficulty-soft: #d8eee4;
}

html[data-difficulty="hard"] {
	--difficulty-accent: #8057a5;
	--difficulty-soft: #eee5f5;
}

.difficulty select {
	color: var(--difficulty-accent, var(--ink));
	background: var(--difficulty-soft, var(--mint));
	transition: color .2s ease, background .2s ease;
}

.cell {
	position: relative;
	display: flex;
	align-items: center;
	justify-content: center;
	min-width: 0;
	width: 100%;
	height: auto;
	aspect-ratio: 1 / 1;
	padding: 0;
	color: var(--ink);
	background: var(--panel);
	border-right: 1px solid var(--line);
	border-bottom: 1px solid var(--line);
	font-family: 'DM Mono', monospace;
	font-size: clamp(17px, 3.3vw, 29px);
	font-weight: 500;
	line-height: 1;
	vertical-align: middle;
	appearance: none;
	-webkit-appearance: none;
	transition: background .15s, color .15s;
}

.cell:nth-child(3n) {
	border-right: 2px solid var(--line-strong);
}

.cell:nth-child(9n) {
	border-right: 0;
}

.cell:nth-child(n+19):nth-child(-n+27),
.cell:nth-child(n+46):nth-child(-n+54) {
	border-bottom: 2px solid var(--line-strong);
}

.cell:nth-child(n+73) {
	border-bottom: 0;
}

.cell.given {
	font-weight: 700;
}

.cell.selected {
	background: var(--difficulty-soft, var(--mint));
}

.cell.related {
	background: #eef6f1;
}

.cell.same-number {
	color: var(--difficulty-accent, var(--mint-strong));
	background: var(--difficulty-soft, #e0f0e8);
}

.cell.error {
	color: #bd5e4d;
	background: var(--coral-soft);
}

.cell:focus-visible {
	z-index: 1;
	outline: 3px solid var(--gold);
	outline-offset: -3px;
}

.cell .notes {
	position: absolute;
	inset: 0;
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	align-items: center;
	justify-items: center;
	padding: 6px;
	color: var(--muted);
	font-family: 'DM Mono', monospace;
	font-size: clamp(7px, 1.5vw, 12px);
	line-height: 1;
}

.cell .notes span.active {
	color: var(--mint-strong);
	font-weight: 700;
}

.stat-label {
	color: var(--muted);
	font-size: 10px;
	font-weight: 800;
	letter-spacing: .08em;
	text-transform: uppercase;
}

.stat-value {
	font-family: 'DM Mono', monospace;
	font-size: 16px;
}

.message {
	min-height: 20px;
	color: var(--muted);
	font-size: 12px;
	text-align: right;
}

.message.alert {
	color: var(--coral);
	font-weight: 800;
}

.message.success {
	color: var(--mint-strong);
	font-weight: 800;
}

.side-card {
	padding: 21px;
	background: rgba(255, 253, 248, .72);
	border-bottom: 2px solid #c3d9d1;
	border-radius: 16px;
}

.side-card h3 {
	margin: 0 0 16px;
	font-family: 'Gowun Batang', serif;
	font-size: 17px;
}

.ranking-level {
	margin: -10px 0 12px;
	color: var(--difficulty-accent, var(--muted));
	font-size: 11px;
	font-weight: 800;
}

.ranking-list {
	display: grid;
	gap: 8px;
	padding: 0;
	list-style: none;
}

.ranking-item {
	display: grid;
	grid-template-columns: 20px minmax(0, 1fr) auto;
	align-items: center;
	gap: 7px;
	font-size: 11px;
}

.ranking-rank {
	color: var(--difficulty-accent, var(--mint-strong));
	font-family: 'DM Mono', monospace;
	font-weight: 700;
}

.ranking-name {
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.ranking-score {
	font-family: 'DM Mono', monospace;
	font-weight: 700;
}

.ranking-empty, .ranking-status, .ranking-note {
	color: var(--muted);
	font-size: 10px;
	line-height: 1.6;
}

.ranking-status:not(:empty) {
	margin-top: 8px;
	color: var(--coral);
}

.ranking-note {
	margin-top: 10px;
}

.record-dialog {
	width: min(420px, calc(100% - 32px));
	margin: auto;
	padding: 26px;
	color: var(--ink);
	background: var(--panel);
	border: 1px solid var(--line-strong);
	border-radius: 18px;
	box-shadow: var(--shadow);
}

.record-dialog::backdrop {
	background: rgba(37, 52, 58, .42);
	backdrop-filter: blur(3px);
}

.record-dialog h2 {
	margin: 0 0 6px;
	font-family: 'Gowun Batang', serif;
	font-size: 22px;
}

.record-dialog p, .record-dialog label {
	color: var(--muted);
	font-size: 12px;
}

.record-dialog label {
	display: block;
	margin: 18px 0 6px;
	font-weight: 800;
}

.record-dialog input {
	width: 100%;
	height: 42px;
	padding: 0 11px;
	color: var(--ink);
	background: white;
	border: 1px solid var(--line-strong);
	border-radius: 8px;
	font: inherit;
}

.record-actions {
	display: flex;
	justify-content: flex-end;
	gap: 8px;
	margin-top: 18px;
}

.record-actions button {
	font-size: 11px;
}

.number {
	display: grid;
	height: 51px;
	place-items: center;
	color: var(--ink);
	background: white;
	border: 1px solid var(--line);
	border-radius: 9px;
	font-family: 'DM Mono', monospace;
	font-size: 18px;
	font-weight: 500;
	transition: .15s ease;
}

.number:hover {
	color: var(--mint-strong);
	border-color: var(--mint-strong);
	background: var(--mint);
}

.number:active {
	transform: scale(.95);
}

.tool {
	height: 37px;
	color: var(--muted);
	background: transparent;
	border: 1px solid var(--line);
	border-radius: 8px;
	font-size: 11px;
	font-weight: 800;
}

.tool.active, .tool:hover {
	color: var(--ink);
	border-color: var(--gold);
	background: #fff7e4;
}

.tip strong {
	color: var(--ink);
}

.reset {
	width: 100%;
	margin-top: 15px;
	color: var(--coral);
	background: transparent;
	border: 0;
	font-size: 11px;
	font-weight: 800;
}

.reset:hover {
	text-decoration: underline;
}