/* Sudoku — тёмная тема. Палитра совпадает с gs.css. */
.sudoku-app {
	--bg: #000;
	--panel: #0b0f19;
	--panel-b: #1f2937;
	--text: #fff;
	--muted: #94a3b8;
	--accent: #8b5cf6;
	--accent-d: #7c3aed;
	--c-green: #10b981;
	--c-red: #ef4444;
	--c-blue: #38bdf8;
	--grid-line: #334155;
	--grid-bold: #64748b;

	max-width: 880px;
	color: var(--text);
	font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
	padding-bottom: 48px;
}

/* ---- Шапка ---- */
.sudoku-head {
	display: flex;
	align-items: flex-end;
	justify-content: space-between;
	gap: 16px;
	flex-wrap: wrap;
	margin-bottom: 16px;
}
.sudoku-title {
	margin: 0;
	font-size: 28px;
	font-weight: 800;
	letter-spacing: .5px;
}
.sudoku-sub {
	color: var(--muted);
	font-size: 14px;
	margin-top: 4px;
}
.sudoku-sub span { color: var(--accent); font-weight: 600; }

.sudoku-stats { display: flex; gap: 12px; }
.sudoku-stat {
	background: var(--panel);
	border: 1px solid var(--panel-b);
	border-radius: 12px;
	padding: 8px 16px;
	min-width: 92px;
	text-align: center;
}
.sudoku-stat-label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .5px; }
.sudoku-stat-value { font-size: 22px; font-weight: 700; font-variant-numeric: tabular-nums; }

/* ---- Кнопки сложности ---- */
.sudoku-difficulties {
	display: flex;
	gap: 8px;
	flex-wrap: wrap;
	margin-bottom: 18px;
}
.sudoku-diff-btn {
	background: var(--panel);
	border: 1px solid var(--panel-b);
	color: var(--muted);
	border-radius: 999px;
	padding: 7px 18px;
	font-size: 14px;
	font-weight: 600;
	cursor: pointer;
	transition: all .15s ease;
}
.sudoku-diff-btn:hover { border-color: var(--accent); color: var(--text); }
.sudoku-diff-btn.active {
	background: var(--accent);
	border-color: var(--accent);
	color: #fff;
}

/* ---- Раскладка ---- */
.sudoku-layout {
	display: flex;
	gap: 24px;
	align-items: flex-start;
	flex-wrap: wrap;
}
.sudoku-board-wrap { flex: 1 1 360px; min-width: 280px; }
.sudoku-side { flex: 0 0 240px; display: flex; flex-direction: column; gap: 14px; }

/* ---- Доска ---- */
.sudoku-board {
	display: grid;
	grid-template-columns: repeat(9, 1fr);
	grid-template-rows: repeat(9, 1fr);
	aspect-ratio: 1 / 1;
	width: 100%;
	background: var(--grid-bold);
	border: 3px solid var(--grid-bold);
	border-radius: 8px;
	overflow: hidden;
	gap: 1px;
	user-select: none;
}
.sudoku-cell {
	position: relative;
	background: var(--panel);
	display: flex;
	align-items: center;
	justify-content: center;
	min-width: 0;
	min-height: 0;
	cursor: pointer;
	transition: background .12s ease;
}
/* Толстые границы блоков 3×3 */
.sudoku-cell:nth-child(9n+1),
.sudoku-cell:nth-child(9n+4),
.sudoku-cell:nth-child(9n+7) { box-shadow: inset 2px 0 0 var(--grid-bold); }
.sudoku-board > .sudoku-cell:nth-child(n+1):nth-child(-n+9),
.sudoku-board > .sudoku-cell:nth-child(n+28):nth-child(-n+36),
.sudoku-board > .sudoku-cell:nth-child(n+55):nth-child(-n+63) { box-shadow: inset 0 2px 0 var(--grid-bold); }

.sudoku-value {
	font-size: clamp(18px, 5vw, 30px);
	font-weight: 600;
	line-height: 1;
	color: var(--c-blue);
}
.sudoku-cell.given .sudoku-value { color: var(--text); font-weight: 700; }

/* Состояния клеток */
.sudoku-cell.related { background: #11182b; }
.sudoku-cell.same { background: #1e2540; }
.sudoku-cell.selected { background: #312e81; }
.sudoku-cell.conflict .sudoku-value,
.sudoku-cell.wrong .sudoku-value { color: var(--c-red); }
.sudoku-cell.wrong { background: rgba(239, 68, 68, .12); }
.sudoku-cell.selected.wrong { background: #4c1d24; }

/* Заметки */
.sudoku-notes {
	position: absolute;
	inset: 2px;
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	grid-template-rows: repeat(3, 1fr);
	pointer-events: none;
}
.sudoku-note {
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: clamp(8px, 1.6vw, 11px);
	line-height: 1;
	color: var(--muted);
}
.sudoku-cell:not(.has-notes) .sudoku-notes { display: none; }

/* ---- Numpad ---- */
.sudoku-numpad {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 8px;
}
.sudoku-num {
	position: relative;
	background: var(--panel);
	border: 1px solid var(--panel-b);
	border-radius: 12px;
	color: var(--text);
	padding: 14px 0;
	cursor: pointer;
	transition: all .12s ease;
}
.sudoku-num:hover { border-color: var(--accent); background: #11182b; }
.sudoku-num-digit { font-size: 24px; font-weight: 700; }
.sudoku-num-count {
	position: absolute;
	bottom: 4px;
	right: 8px;
	font-size: 11px;
	color: var(--muted);
}
.sudoku-num.exhausted { opacity: .35; pointer-events: none; }

/* ---- Действия ---- */
.sudoku-actions {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 8px;
}
.sudoku-btn {
	background: var(--panel);
	border: 1px solid var(--panel-b);
	color: var(--text);
	border-radius: 10px;
	padding: 11px 10px;
	font-size: 14px;
	font-weight: 600;
	cursor: pointer;
	transition: all .12s ease;
}
.sudoku-btn:hover { border-color: var(--accent); background: #11182b; }
.sudoku-btn.active {
	background: var(--accent);
	border-color: var(--accent);
	color: #fff;
}
.sudoku-btn-primary {
	background: var(--accent);
	border-color: var(--accent);
	color: #fff;
}
.sudoku-btn-primary:hover { background: var(--accent-d); border-color: var(--accent-d); }

/* ---- Модалка победы ---- */
.sudoku-win {
	position: fixed;
	inset: 0;
	background: rgba(0, 0, 0, .7);
	display: none;
	align-items: center;
	justify-content: center;
	z-index: 1050;
}
.sudoku-win.show { display: flex; }
.sudoku-win-card {
	background: var(--panel);
	border: 1px solid var(--panel-b);
	border-radius: 18px;
	padding: 32px 36px;
	text-align: center;
	max-width: 340px;
	width: 90%;
}
.sudoku-win-emoji { font-size: 48px; }
.sudoku-win-title { margin: 8px 0 16px; font-size: 26px; font-weight: 800; }
.sudoku-win-row { color: var(--muted); margin: 6px 0; font-size: 15px; }
.sudoku-win-row strong { color: var(--text); font-variant-numeric: tabular-nums; }
.sudoku-win-record { color: var(--c-green); font-weight: 700; margin: 14px 0; }
.sudoku-win-card .sudoku-btn-primary { margin-top: 12px; width: 100%; }

/* ---- Мобильная раскладка ---- */
@media (max-width: 680px) {
	.sudoku-layout { flex-direction: column; }
	.sudoku-side { flex: 1 1 auto; width: 100%; }
	.sudoku-actions { grid-template-columns: repeat(4, 1fr); }
}