:root {
	--bg: #f4f5f8;
	--panel: #ffffff;
	--text: #1d2330;
	--muted: #667085;
	--border: #d8dce5;
	--code-bg: #eef0f5;
	--accent: #2459d8;
	--accent-text: #ffffff;
	--accent-2: #1a7f4b;
	--bad: #b42318;
	--bad-bg: #fdecea;
	--radius: 10px;
}

@media (prefers-color-scheme: dark) {
	:root {
		--bg: #12151c;
		--panel: #1b202b;
		--text: #e6e9f0;
		--muted: #98a2b3;
		--border: #2e3544;
		--code-bg: #242b39;
		--accent: #5b8def;
		--accent-text: #0b1020;
		--accent-2: #4cc38a;
		--bad: #ff8a80;
		--bad-bg: #3a1d1b;
	}
}

*,
*::before,
*::after {
	box-sizing: border-box;
}

[hidden] {
	display: none !important;
}

html {
	color-scheme: light dark;
}

body {
	margin: 0;
	background: var(--bg);
	color: var(--text);
	font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

h1 {
	margin: 0;
	font-size: 1.15rem;
}

h2 {
	margin: 0;
	font-size: 1rem;
}

h3 {
	margin: 0 0 8px;
	font-size: 0.95rem;
}

code,
pre {
	font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
	font-size: 0.85rem;
}

.muted {
	color: var(--muted);
}

p {
	margin: 8px 0;
}

/* ---- top bar ---- */

.topbar {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: space-between;
	gap: 8px 24px;
	padding: 12px 16px;
	padding-top: max(12px, env(safe-area-inset-top));
	background: var(--panel);
	border-bottom: 1px solid var(--border);
}

.backend,
.backend-form {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 8px;
}

.backend-form input {
	width: min(300px, 60vw);
}

.conn::before {
	content: "● ";
}

.conn[data-state="true"] {
	color: var(--accent-2);
}

.conn[data-state="false"] {
	color: var(--bad);
}

.conn[data-state="null"] {
	color: var(--muted);
}

/* ---- error banner ---- */

.error {
	display: flex;
	align-items: flex-start;
	justify-content: space-between;
	gap: 12px;
	margin: 12px 16px 0;
	padding: 10px 14px;
	border: 1px solid var(--bad);
	border-radius: var(--radius);
	background: var(--bad-bg);
	color: var(--bad);
}

/* ---- layout ---- */

.layout {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
	gap: 16px;
	max-width: 1200px;
	margin: 0 auto;
	padding: 16px;
	padding-bottom: max(16px, env(safe-area-inset-bottom));
	align-items: start;
}

.col {
	display: grid;
	gap: 16px;
}

.raw {
	grid-column: 1 / -1;
}

@media (max-width: 800px) {
	.layout {
		grid-template-columns: minmax(0, 1fr);
	}
}

.panel {
	padding: 14px 16px;
	background: var(--panel);
	border: 1px solid var(--border);
	border-radius: var(--radius);
}

.panel-head {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 12px;
	margin-bottom: 8px;
}

.row {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 8px;
	margin-top: 8px;
}

.hint {
	font-size: 0.85rem;
}

/* ---- controls ---- */

button,
select,
input {
	font: inherit;
	color: inherit;
}

button {
	padding: 6px 14px;
	border: 1px solid var(--accent);
	border-radius: 8px;
	background: var(--accent);
	color: var(--accent-text);
	cursor: pointer;
}

button.secondary {
	background: transparent;
	color: var(--accent);
}

button.icon {
	padding: 0 8px;
	border-color: transparent;
	background: transparent;
	color: inherit;
	font-size: 1.2rem;
	line-height: 1.2;
}

button:disabled {
	opacity: 0.5;
	cursor: not-allowed;
}

button:focus-visible,
select:focus-visible,
input:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 2px;
}

select,
input {
	padding: 6px 10px;
	border: 1px solid var(--border);
	border-radius: 8px;
	background: var(--panel);
}

.toggle {
	display: inline-flex;
}

.toggle button {
	border-color: var(--border);
	border-radius: 0;
	background: transparent;
	color: var(--text);
}

.toggle button:first-child {
	border-radius: 8px 0 0 8px;
}

.toggle button:last-child {
	border-radius: 0 8px 8px 0;
	border-left: 0;
}

.toggle button[aria-pressed="true"] {
	border-color: var(--accent);
	background: var(--accent);
	color: var(--accent-text);
}

.badge {
	display: inline-block;
	padding: 0 8px;
	border-radius: 999px;
	background: var(--code-bg);
	color: var(--muted);
	font-size: 0.8rem;
}

/* ---- state ---- */

.statusline {
	margin: 0 0 10px;
	font-weight: 600;
}

.json {
	margin: 0;
	padding: 10px 12px;
	overflow: auto;
	max-height: 360px;
	border-radius: 8px;
	background: var(--code-bg);
	white-space: pre-wrap;
	word-break: break-word;
}

.ttt-board {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 6px;
	width: min(100%, 320px);
	margin: 0 auto;
}

.ttt-cell {
	display: grid;
	place-items: center;
	aspect-ratio: 1;
	padding: 0;
	border: 1px solid var(--border);
	border-radius: 10px;
	background: var(--code-bg);
	color: var(--text);
	font-size: clamp(2rem, 9vw, 3.2rem);
	font-weight: 700;
	line-height: 1;
}

.ttt-cell:disabled {
	opacity: 1;
	cursor: default;
}

.ttt-cell.mark-X {
	color: var(--accent);
}

.ttt-cell.mark-O {
	color: var(--accent-2);
}

.ttt-cell[data-ghost]:not(:disabled):hover {
	border-color: var(--accent);
}

.ttt-cell[data-ghost]:not(:disabled):hover::after {
	content: attr(data-ghost);
	opacity: 0.35;
}

/* ---- moves ---- */

.moves,
.strategies {
	display: grid;
	gap: 6px;
	margin: 0 0 10px;
	padding: 0;
	list-style: none;
}

.moves {
	max-height: 280px;
	overflow: auto;
}

.move {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 8px;
	width: 100%;
	border-color: var(--border);
	background: var(--code-bg);
	color: var(--text);
	text-align: left;
}

.move[aria-pressed="true"] {
	border-color: var(--accent);
	box-shadow: inset 0 0 0 1px var(--accent);
}

/* ---- strategies ---- */

.strategy {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 12px;
	padding: 8px 10px;
	border: 1px solid var(--border);
	border-radius: 8px;
}

.strategy-info {
	min-width: 0;
}

.strategy-title {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 4px 8px;
}

.options {
	display: block;
	overflow-wrap: anywhere;
	color: var(--muted);
}

.suggestion {
	margin-top: 12px;
	padding: 12px;
	border: 1px solid var(--accent);
	border-radius: 8px;
}

summary {
	cursor: pointer;
}