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

body {
	margin: 0;
	font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
	line-height: 1.5;
	color: #1a1a2e;
	background: #f8f9fc;
}

.wrap {
	max-width: 42rem;
	margin: 0 auto;
	padding: 1.5rem;
}

header {
	margin-bottom: 1.5rem;
}

header h1 {
	margin: 0 0 0.25rem;
	font-size: 1.5rem;
	font-weight: 700;
}

header .meta {
	margin: 0;
	font-size: 0.875rem;
	color: #5c5c7a;
}

section {
	margin-bottom: 1.25rem;
}

section h2 {
	margin: 0 0 0.5rem;
	font-size: 0.75rem;
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	color: #5c5c7a;
}

.panel {
	background: #fff;
	border: 1px solid #e2e4ec;
	border-radius: 8px;
	padding: 1rem 1.25rem;
}

.status {
	margin: 0 0 1rem;
	font-size: 0.9375rem;
	color: #3d3d5c;
}

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

.btn {
	padding: 0.5rem 1rem;
	font-size: 0.875rem;
	font-weight: 500;
	border: none;
	border-radius: 6px;
	cursor: pointer;
	background: #5b4cdb;
	color: #fff;
}

.btn:hover:not(:disabled) {
	background: #4a3bc4;
}

.btn:disabled {
	opacity: 0.5;
	cursor: not-allowed;
}

.btn.secondary {
	background: #fff;
	color: #3d3d5c;
	border: 1px solid #d0d3de;
}

.btn.secondary:hover:not(:disabled) {
	background: #f0f1f5;
}

ol.checklist {
	margin: 0;
	padding-left: 1.25rem;
}

ol.checklist li {
	margin-bottom: 0.35rem;
}

.signals {
	margin: 0;
	padding-left: 1.25rem;
}

.signals li {
	margin-bottom: 0.25rem;
}

details {
	margin-top: 0.75rem;
}

details summary {
	cursor: pointer;
	font-weight: 500;
	font-size: 0.9375rem;
	color: #5b4cdb;
}

details[open] summary {
	margin-bottom: 0.5rem;
}

details p,
details pre {
	margin: 0.5rem 0 0;
	font-size: 0.875rem;
}

pre {
	background: #f0f1f5;
	border-radius: 6px;
	padding: 0.75rem 1rem;
	overflow-x: auto;
	font-size: 0.8125rem;
	line-height: 1.45;
}

.back {
	margin-top: 2rem;
	font-size: 0.875rem;
}

.back a {
	color: #5b4cdb;
	text-decoration: none;
}

.back a:hover {
	text-decoration: underline;
}

/* Index page */
.challenge-list {
	list-style: none;
	margin: 0;
	padding: 0;
}

.challenge-list li {
	margin-bottom: 0.75rem;
}

.challenge-list a {
	display: block;
	padding: 0.75rem 1rem;
	background: #fff;
	border: 1px solid #e2e4ec;
	border-radius: 8px;
	color: #1a1a2e;
	text-decoration: none;
	font-weight: 500;
}

.challenge-list a:hover {
	border-color: #5b4cdb;
	background: #faf9ff;
}

.challenge-list .desc {
	display: block;
	font-weight: 400;
	font-size: 0.8125rem;
	color: #5c5c7a;
	margin-top: 0.15rem;
}