:root {
	--bg: #f6f4ef;
	--surface: #ffffff;
	--text: #1f1d1a;
	--muted: #6b665d;
	--border: #ddd8ce;
	--accent: #2f5d50;
	--accent-text: #ffffff;
	--sq-light: #ece3cf;
	--sq-dark: #a88a65;
	--sq-last: rgba(214, 180, 60, 0.55);
	--error: #a3352b;
	color-scheme: light;
}

@media (prefers-color-scheme: dark) {
	:root:not([data-theme="light"]) {
		--bg: #161513;
		--surface: #201f1c;
		--text: #ebe7df;
		--muted: #a39d92;
		--border: #3a3732;
		--accent: #6fb39d;
		--accent-text: #0f1a16;
		--sq-light: #8f8169;
		--sq-dark: #5c4d3b;
		--error: #e58a7f;
		color-scheme: dark;
	}
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
	margin: 0;
	background: var(--bg);
	color: var(--text);
	font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

.top, main, .foot {
	max-width: 760px;
	margin: 0 auto;
	padding: 0 16px;
}

.top { padding-top: 28px; }
h1 { margin: 0; font-size: 1.6rem; letter-spacing: -0.01em; }
.lede { margin: 4px 0 20px; color: var(--muted); }
h2 { margin: 0 0 12px; font-size: 1.05rem; }

.card {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: 12px;
	padding: 16px;
	margin-bottom: 16px;
}

textarea {
	width: 100%;
	min-height: 120px;
	resize: vertical;
	font: 13px/1.4 ui-monospace, Menlo, monospace;
}

textarea, input[type="url"], select {
	background: var(--bg);
	color: var(--text);
	border: 1px solid var(--border);
	border-radius: 8px;
	padding: 8px 10px;
}

.row { display: flex; gap: 8px; align-items: center; margin-top: 10px; }
.row.wrap { flex-wrap: wrap; }
.row input[type="url"] { flex: 1; min-width: 0; }

button, .button {
	font: inherit;
	background: var(--bg);
	color: var(--text);
	border: 1px solid var(--border);
	border-radius: 8px;
	padding: 7px 14px;
	cursor: pointer;
}
button:hover, .button:hover { border-color: var(--muted); }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
button:disabled { opacity: 0.45; cursor: default; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.message { margin: 10px 0 0; min-height: 1.5em; color: var(--muted); font-size: 0.92rem; }
.message.error { color: var(--error); }

.game-title { margin: 0; font-weight: 600; }
.position { margin: 2px 0 0; color: var(--muted); font-variant-numeric: tabular-nums; }
.caption { margin: 8px 0 0; min-height: 1.5em; font-size: 1.15rem; }

.controls { display: flex; justify-content: center; gap: 10px; margin: 16px 0 6px; }
.controls button { min-width: 48px; height: 44px; font-size: 1rem; }
.controls button.big { min-width: 72px; font-size: 1.2rem; }
.hint { text-align: center; color: var(--muted); font-size: 0.82rem; margin: 0; }

.board {
	display: grid;
	/* Rows too, or rows without pieces come out shorter. */
	grid-template-columns: repeat(8, 1fr);
	grid-template-rows: repeat(8, 1fr);
	width: min(100%, 360px);
	aspect-ratio: 1;
	margin: 16px auto 0;
	border: 1px solid var(--border);
	border-radius: 4px;
	overflow: hidden;
}
.sq { display: grid; place-items: center; position: relative; min-width: 0; min-height: 0; }
.sq.light { background: var(--sq-light); }
.sq.dark { background: var(--sq-dark); }
.sq.last::after { content: ""; position: absolute; inset: 0; background: var(--sq-last); }
.piece { position: relative; z-index: 1; width: 90%; height: 90%; pointer-events: none; }

.moves {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
	gap: 2px 12px;
	margin: 16px 0 0;
	padding-left: 2.2em;
	font-variant-numeric: tabular-nums;
}
.moves li { color: var(--muted); }
.moves span { padding: 0 3px; border-radius: 4px; color: var(--text); }
.moves span.current { background: var(--accent); color: var(--accent-text); }
.moves span.flag { text-decoration: underline dotted; }

.settings { display: grid; gap: 14px; }
fieldset { border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px 14px; margin: 0; display: grid; gap: 10px; }
legend { font-weight: 600; padding: 0 4px; }
.settings label { display: grid; gap: 4px; }
.settings label.check { display: flex; gap: 8px; align-items: center; }
.settings output { color: var(--muted); font-variant-numeric: tabular-nums; }
.settings select { max-width: 100%; }
.note { margin: 0; color: var(--muted); font-size: 0.85rem; }

.foot { color: var(--muted); font-size: 0.85rem; padding-bottom: 32px; }

body.dragging main { outline: 2px dashed var(--accent); outline-offset: 8px; border-radius: 12px; }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }