:root {
	color-scheme: dark;
	--bg: #0b0d10;
	--panel-bg: #14171c;
	--panel-border: #262b33;
	--text: #d7dbe0;
	--text-dim: #8a919c;
	--accent: #4da3ff;
	--ok: #3ecf6e;
	--warn: #e8b339;
	--err: #ef4444;
	--mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* {
	box-sizing: border-box;
}

html, body {
	margin: 0;
	padding: 0;
	height: 100%;
	background: var(--bg);
	color: var(--text);
	font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
	overflow: hidden;
}

#app {
	position: relative;
	width: 100vw;
	height: 100vh;
	display: flex;
	flex-direction: column;
}

/* ---------- Top bar ---------- */

#topbar {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	padding: 0.5rem 0.75rem;
	background: var(--panel-bg);
	border-bottom: 1px solid var(--panel-border);
	font-size: 0.85rem;
	z-index: 20;
}

#topbar .title {
	font-weight: 600;
	color: var(--text);
	white-space: nowrap;
}

#topbar .status-dot {
	width: 0.55rem;
	height: 0.55rem;
	border-radius: 50%;
	background: var(--text-dim);
	flex: none;
}

#topbar .status-dot[data-state="loading"] { background: var(--warn); }
#topbar .status-dot[data-state="ok"] { background: var(--ok); }
#topbar .status-dot[data-state="error"] { background: var(--err); }

#topbar #status-text {
	color: var(--text-dim);
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

#topbar .spacer {
	flex: 1;
}

#topbar button {
	background: #1c2027;
	color: var(--text);
	border: 1px solid var(--panel-border);
	border-radius: 4px;
	padding: 0.35rem 0.65rem;
	font-size: 0.8rem;
	cursor: pointer;
}

#topbar button:hover {
	background: #262c35;
}

#topbar button:disabled {
	opacity: 0.4;
	cursor: not-allowed;
}

.fps-badge {
	font-family: var(--mono);
	font-size: 0.78rem;
	color: var(--text-dim);
	white-space: nowrap;
}

.debug-toggle {
	display: flex;
	align-items: center;
	gap: 0.3rem;
	font-size: 0.78rem;
	color: var(--text-dim);
	cursor: pointer;
	white-space: nowrap;
	margin-right: 0.5rem;
}

.debug-toggle input {
	cursor: pointer;
}

/* ---------- Boot progress ---------- */

#boot-progress-section {
	flex: none;
}

#boot-progress-list {
	list-style: none;
	margin: 0;
	padding: 0.4rem 0.75rem;
	font-size: 0.8rem;
}

#boot-progress-list li {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	padding: 0.25rem 0;
	color: var(--text-dim);
}

#boot-progress-list li::before {
	content: "○";
	color: var(--text-dim);
	width: 1rem;
	text-align: center;
	flex: none;
}

#boot-progress-list li[data-state="done"] {
	color: var(--ok);
}

#boot-progress-list li[data-state="done"]::before {
	content: "●";
	color: var(--ok);
}

#boot-progress-list li[data-state="active"] {
	color: var(--accent);
}

#boot-progress-list li[data-state="active"]::before {
	content: "◐";
	color: var(--accent);
	animation: spin 1.2s linear infinite;
	display: inline-block;
}

#boot-progress-list li[data-state="failed"] {
	color: var(--err);
}

#boot-progress-list li[data-state="failed"]::before {
	content: "✕";
	color: var(--err);
}

/* ---------- Viewport / canvas ---------- */

#viewport {
	position: relative;
	flex: 1;
	min-height: 0;
	background: #000;
	display: flex;
	align-items: center;
	justify-content: center;
	overflow: hidden;
}

#canvas {
	display: block;
	width: 100%;
	height: 100%;
	background: #000;
	outline: none;
}

/* ---------- Loading overlay ---------- */

#loading-overlay {
	position: absolute;
	inset: 0;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 1rem;
	background: radial-gradient(circle at 50% 40%, #16191f 0%, #0b0d10 70%);
	transition: opacity 0.25s ease;
	z-index: 10;
}

#loading-overlay.hidden {
	opacity: 0;
	pointer-events: none;
}

.spinner {
	width: 2.5rem;
	height: 2.5rem;
	border-radius: 50%;
	border: 3px solid var(--panel-border);
	border-top-color: var(--accent);
	animation: spin 0.9s linear infinite;
}

@keyframes spin {
	to { transform: rotate(360deg); }
}

#loading-status {
	color: var(--text-dim);
	font-size: 0.9rem;
	min-height: 1.2em;
}

.progress-track {
	width: 16rem;
	max-width: 70vw;
	height: 0.4rem;
	border-radius: 0.25rem;
	background: #1c2027;
	overflow: hidden;
}

.progress-fill {
	height: 100%;
	width: 0%;
	background: var(--accent);
	transition: width 0.15s ease;
}

.progress-fill.indeterminate {
	width: 40% !important;
	animation: indeterminate 1.2s ease-in-out infinite;
}

@keyframes indeterminate {
	0% { transform: translateX(-100%); }
	100% { transform: translateX(250%); }
}

/* ---------- Assets overlay (task 6/7/8/9: mount, validate, start) ---------- */

.hidden {
	display: none !important;
}

#assets-overlay {
	position: absolute;
	inset: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	background: rgba(11, 13, 16, 0.92);
	z-index: 15;
}

.assets-card {
	width: 28rem;
	max-width: 90vw;
	max-height: 85vh;
	overflow-y: auto;
	background: var(--panel-bg);
	border: 1px solid var(--panel-border);
	border-radius: 8px;
	padding: 1.25rem 1.5rem;
}

.assets-card h2 {
	margin: 0 0 0.5rem;
	font-size: 1rem;
	color: var(--text);
}

.assets-hint {
	font-size: 0.8rem;
	color: var(--text-dim);
	line-height: 1.5;
	margin: 0 0 0.9rem;
}

.assets-hint a {
	color: var(--accent);
}

#assets-status {
	font-size: 0.82rem;
	margin-bottom: 0.5rem;
}

#assets-status[data-ok="true"] { color: var(--ok); }
#assets-status[data-ok="false"] { color: var(--warn); }

#assets-missing-list {
	list-style: none;
	margin: 0 0 0.9rem;
	padding: 0;
	max-height: 9rem;
	overflow-y: auto;
	font-family: var(--mono);
	font-size: 0.7rem;
	color: #e8a9a9;
	border: 1px solid var(--panel-border);
	border-radius: 4px;
}

#assets-missing-list:empty {
	display: none;
}

#assets-missing-list li {
	padding: 0.2rem 0.5rem;
	border-bottom: 1px solid #1c2027;
}

#assets-missing-list li:last-child {
	border-bottom: none;
}

.assets-actions {
	display: flex;
	flex-wrap: wrap;
	gap: 0.5rem;
}

.assets-actions button {
	background: #1c2027;
	color: var(--text);
	border: 1px solid var(--panel-border);
	border-radius: 4px;
	padding: 0.45rem 0.8rem;
	font-size: 0.8rem;
	cursor: pointer;
}

.assets-actions button:hover {
	background: #262c35;
}

#start-engine-btn {
	background: var(--accent);
	color: #04101c;
	border-color: var(--accent);
	font-weight: 600;
	margin-left: auto;
}

#start-engine-btn:hover {
	filter: brightness(1.08);
}

/* ---------- Error banner ---------- */

#error-banner {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	background: #2a1216;
	border-bottom: 1px solid #5c1e24;
	color: #ffb4b4;
	padding: 0.6rem 0.9rem;
	font-size: 0.85rem;
	z-index: 30;
	display: none;
}

#error-banner.visible {
	display: block;
}

#error-banner .error-title {
	font-weight: 600;
	color: #ff8a8a;
	margin-bottom: 0.15rem;
}

#error-banner .error-detail {
	font-family: var(--mono);
	white-space: pre-wrap;
	word-break: break-word;
	color: #e8a9a9;
	max-height: 8rem;
	overflow-y: auto;
}

/* ---------- Side panel (diagnostics + log) ---------- */

#sidepanel {
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	width: 22rem;
	max-width: 90vw;
	background: var(--panel-bg);
	border-left: 1px solid var(--panel-border);
	display: flex;
	flex-direction: column;
	transform: translateX(100%);
	transition: transform 0.2s ease;
	z-index: 25;
}

#sidepanel.open {
	transform: translateX(0);
}

.panel-section {
	display: flex;
	flex-direction: column;
	min-height: 0;
}

.panel-section h2 {
	font-size: 0.75rem;
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--text-dim);
	margin: 0;
	padding: 0.6rem 0.75rem 0.4rem;
	border-bottom: 1px solid var(--panel-border);
	flex: none;
}

#diagnostics-section {
	flex: none;
	max-height: 55%;
	overflow-y: auto;
}

#diagnostics-table,
#input-summary-table,
#input-mouse-table,
#perf-table {
	width: 100%;
	border-collapse: collapse;
	font-family: var(--mono);
	font-size: 0.75rem;
}

#diagnostics-table td,
#input-summary-table td,
#input-mouse-table td,
#perf-table td {
	padding: 0.3rem 0.75rem;
	border-bottom: 1px solid #1c2027;
	vertical-align: top;
}

#diagnostics-table td.key,
#input-summary-table td.key,
#input-mouse-table td.key,
#perf-table td.key {
	color: var(--text-dim);
	white-space: nowrap;
	width: 45%;
}

#diagnostics-table td.val,
#input-summary-table td.val,
#input-mouse-table td.val,
#perf-table td.val {
	color: var(--text);
	word-break: break-word;
}

#diagnostics-table td.val[data-ok="true"],
#input-summary-table td.val[data-ok="true"],
#input-mouse-table td.val[data-ok="true"],
#perf-table td.val[data-ok="true"] { color: var(--ok); }
#diagnostics-table td.val[data-ok="false"],
#input-summary-table td.val[data-ok="false"],
#input-mouse-table td.val[data-ok="false"],
#perf-table td.val[data-ok="false"] { color: var(--err); }
#diagnostics-table td.val[data-ok="warn"],
#input-summary-table td.val[data-ok="warn"],
#input-mouse-table td.val[data-ok="warn"],
#perf-table td.val[data-ok="warn"] { color: var(--warn); }

/* ---------- Input debug panel ---------- */

#input-debug-section {
	flex: none;
	max-height: 45%;
	overflow-y: auto;
}

.input-subhead {
	font-size: 0.7rem;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	color: var(--text-dim);
	padding: 0.5rem 0.75rem 0.25rem;
}

.input-chip-list {
	display: flex;
	flex-wrap: wrap;
	gap: 0.3rem;
	padding: 0 0.75rem 0.5rem;
	font-family: var(--mono);
	font-size: 0.72rem;
}

.input-chip-list:empty::before,
.input-chip-list.empty::before {
	content: "(none)";
	color: var(--text-dim);
}

.input-key-chip {
	background: #1c2027;
	border: 1px solid var(--panel-border);
	border-radius: 4px;
	padding: 0.1rem 0.4rem;
	color: var(--accent);
}

#input-gamepad-info {
	padding: 0.3rem 0.75rem 0.75rem;
	font-family: var(--mono);
	font-size: 0.72rem;
	color: var(--text-dim);
	white-space: pre-wrap;
}

#pointerlock-hint {
	position: absolute;
	left: 50%;
	bottom: 1.25rem;
	transform: translateX(-50%);
	background: rgba(20, 23, 28, 0.9);
	border: 1px solid var(--panel-border);
	color: var(--text);
	font-size: 0.78rem;
	padding: 0.5rem 0.9rem;
	border-radius: 999px;
	cursor: pointer;
	z-index: 12;
}

#pointerlock-hint:hover {
	background: rgba(30, 34, 41, 0.95);
}

#log-section {
	flex: 1;
	min-height: 0;
}

#log-output {
	flex: 1;
	min-height: 0;
	overflow-y: auto;
	margin: 0;
	padding: 0.5rem 0.75rem;
	font-family: var(--mono);
	font-size: 0.72rem;
	line-height: 1.5;
	white-space: pre-wrap;
	word-break: break-word;
}

.log-line {
	border-bottom: 1px solid #1a1d22;
	padding: 0.15rem 0;
}

.log-line.stderr { color: #ff9f9f; }
.log-line.info { color: var(--text-dim); }

noscript {
	position: fixed;
	inset: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	background: var(--bg);
	color: var(--text);
	padding: 2rem;
	text-align: center;
	font-size: 1rem;
}