:root {
	--bg-color: #fcfcfc;
	--text-color: #1a1a1a;
	--muted-color: #555555;
	--border-color: #e2e8f0;
	--card-bg: #ffffff;
	--link-color: #2563eb;
	--link-hover: #1d4ed8;
	--accent: #0f172a;
	--tag-bg: #f1f5f9;
	--tag-color: #475569;
}

@media (prefers-color-scheme: dark) {
	:root {
		--bg-color: #0f172a;
		--text-color: #f1f5f9;
		--muted-color: #94a3b8;
		--border-color: #334155;
		--card-bg: #1e293b;
		--link-color: #60a5fa;
		--link-hover: #93c5fd;
		--accent: #f8fafc;
		--tag-bg: #1e293b;
		--tag-color: #cbd5e1;
	}
}

* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

body {
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
	line-height: 1.65;
	background-color: var(--bg-color);
	color: var(--text-color);
	padding: 2rem 1.5rem;
	min-height: 100vh;
	display: flex;
	flex-direction: column;
}

.container {
	max-width: 780px;
	margin: 0 auto;
	width: 100%;
	flex: 1;
}

header {
	border-bottom: 1px solid var(--border-color);
	padding-bottom: 1.5rem;
	margin-bottom: 2rem;
	display: flex;
	justify-content: space-between;
	align-items: center;
	flex-wrap: wrap;
	gap: 1rem;
}

.brand {
	font-size: 1.35rem;
	font-weight: 700;
	color: var(--accent);
	text-decoration: none;
	letter-spacing: -0.02em;
}

nav a {
	color: var(--muted-color);
	text-decoration: none;
	font-size: 0.95rem;
	margin-left: 1.25rem;
	transition: color 0.15s ease;
}

nav a:hover, nav a.active {
	color: var(--link-color);
	text-decoration: underline;
}

h1 {
	font-size: 2rem;
	font-weight: 700;
	color: var(--accent);
	margin-bottom: 0.75rem;
	letter-spacing: -0.03em;
}

h2 {
	font-size: 1.3rem;
	font-weight: 600;
	color: var(--accent);
	margin-top: 2rem;
	margin-bottom: 0.75rem;
	letter-spacing: -0.02em;
}

p {
	margin-bottom: 1rem;
	color: var(--text-color);
}

ul, ol {
	margin-bottom: 1rem;
	padding-left: 1.5rem;
}

li {
	margin-bottom: 0.4rem;
}

a {
	color: var(--link-color);
	text-decoration: none;
}

a:hover {
	color: var(--link-hover);
	text-decoration: underline;
}

a:focus-visible, nav a:focus-visible {
	outline: 2px solid var(--link-color);
	outline-offset: 3px;
	border-radius: 2px;
}

.notice-box {
	background-color: var(--card-bg);
	border: 1px solid var(--border-color);
	border-left: 4px solid var(--link-color);
	padding: 1rem 1.25rem;
	border-radius: 6px;
	margin-bottom: 1.5rem;
	font-size: 0.95rem;
}

.meta-info {
	font-size: 0.875rem;
	color: var(--muted-color);
	margin-bottom: 1.5rem;
}

.card {
	background-color: var(--card-bg);
	border: 1px solid var(--border-color);
	border-radius: 8px;
	padding: 1.25rem;
	margin-bottom: 1.25rem;
}

.card-title {
	font-size: 1.1rem;
	font-weight: 600;
	margin-bottom: 0.5rem;
	color: var(--accent);
}

.tag {
	display: inline-block;
	font-size: 0.75rem;
	font-weight: 600;
	text-transform: uppercase;
	background-color: var(--tag-bg);
	color: var(--tag-color);
	padding: 0.15rem 0.5rem;
	border-radius: 4px;
	border: 1px solid var(--border-color);
	margin-bottom: 0.5rem;
}

code {
	font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
	font-size: 0.875em;
	background-color: var(--tag-bg);
	padding: 0.15rem 0.35rem;
	border-radius: 4px;
}

footer {
	border-top: 1px solid var(--border-color);
	padding-top: 1.5rem;
	margin-top: 3rem;
	font-size: 0.875rem;
	color: var(--muted-color);
	display: flex;
	justify-content: space-between;
	flex-wrap: wrap;
	gap: 1rem;
}