/* --- CSS VARIABLES (Light Mode Default) --- */
:root {
	--primary-color: #0366d6;
	--text-color: #24292e;
	--text-secondary: #586069;
	--bg-color: #ffffff;
	--sidebar-bg: #f8f9fa;
	--border-color: #e1e4e8;

	--nav-hover-bg: rgba(0, 0, 0, 0.05);
	--nav-active-bg: #f1f8ff;
	--nav-active-text: #0366d6;

	--code-block-bg: #1f2428;
	--code-block-text: #e1e4e8;
	--inline-code-bg: rgba(27, 31, 35, 0.05);

	--table-header-bg: #fafbfc;
	--table-stripe-bg: #f6f8fa;

	--blockquote-text: #6a737d;
	--blockquote-border: #dfe2e5;

	--font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* --- DARK MODE VARIABLES --- */
@media (prefers-color-scheme: dark) {
	:root {
		--primary-color: #58a6ff;
		--text-color: #c9d1d9;
		--text-secondary: #8b949e;
		--bg-color: #0d1117;
		--sidebar-bg: #161b22;
		--border-color: #30363d;

		--nav-hover-bg: rgba(177, 186, 196, 0.12);
		--nav-active-bg: rgba(56, 139, 253, 0.15);
		--nav-active-text: #58a6ff;

		--code-block-bg: #161b22;
		--code-block-text: #c9d1d9;
		--inline-code-bg: rgba(240, 246, 252, 0.15);

		--table-header-bg: #161b22;
		--table-stripe-bg: #161b22;

		--blockquote-text: #8b949e;
		--blockquote-border: #30363d;
	}
}

/* --- GLOBAL RESET & BASE --- */
* {
	box-sizing: border-box;
}

body {
	font-family: var(--font-stack);
	margin: 0;
	line-height: 1.6;
	color: var(--text-color);
	background-color: var(--bg-color);
	display: flex;
	min-height: 100vh;
	transition: background-color 0.3s, color 0.3s;
}

/* --- NAVIGATION (SIDEBAR) --- */
nav {
	width: 300px;
	background: var(--sidebar-bg);
	padding: 20px;
	height: 100vh;
	overflow-y: auto;
	position: fixed;
	left: 0;
	top: 0;
	border-right: 1px solid var(--border-color);
	z-index: 100;
}

nav h2 {
	color: var(--text-color);
	font-size: 1.2em;
	padding-bottom: 10px;
	margin-bottom: 20px;
	border-bottom: 1px solid var(--border-color);
}

nav a {
	display: block;
	padding: 8px 12px;
	color: var(--text-secondary);
	text-decoration: none;
	font-size: 0.95em;
	border-radius: 6px;
	transition: all 0.2s ease;
	margin-bottom: 2px;
}

nav a:hover {
	color: var(--text-color);
	background-color: var(--nav-hover-bg);
	text-decoration: none;
}

nav a.active {
	font-weight: 600;
	color: var(--nav-active-text);
	background-color: var(--nav-active-bg);
}

nav div>a {
	font-weight: bold;
	color: var(--text-color);
	margin-bottom: 15px;
	display: inline-block;
}

/* --- MAIN CONTENT --- */
main {
	margin-left: 300px;
	padding: 40px 60px;
	width: 100%;
	max-width: 1200px;
}

/* --- TYPOGRAPHY & ELEMENTS --- */
h1,
h2,
h3 {
	color: var(--text-color);
	margin-top: 1.5em;
	font-weight: 600;
}

h1 {
	margin-top: 0;
	padding-bottom: 0.3em;
	border-bottom: 1px solid var(--border-color);
	font-size: 2em;
}

p {
	margin-bottom: 16px;
}

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

a:hover {
	text-decoration: underline;
}

/* --- IMAGES --- */
img {
	max-width: 100%;
	height: auto;
	border: 1px solid var(--border-color);
	border-radius: 6px;
	box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
	margin: 20px 0;
	opacity: 0.9;
}

/* --- CODE BLOCKS --- */
pre {
	background: var(--code-block-bg);
	color: var(--code-block-text);
	padding: 16px;
	border-radius: 6px;
	overflow-x: auto;
	line-height: 1.45;
	margin: 16px 0;
	border: 1px solid var(--border-color);
}

code {
	font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
	font-size: 85%;
	padding: 0.2em 0.4em;
	border-radius: 3px;
	background-color: var(--inline-code-bg);
	color: var(--text-color);
}

pre code {
	background: transparent;
	padding: 0;
	font-size: 100%;
	color: inherit;
}

/* --- TABLES --- */
table {
	border-collapse: collapse;
	width: 100%;
	margin: 20px 0;
	display: block;
	overflow-x: auto;
}

th,
td {
	border: 1px solid var(--border-color);
	padding: 10px 13px;
	color: var(--text-color);
}

th {
	background-color: var(--table-header-bg);
	font-weight: 600;
	text-align: left;
}

tr:nth-child(2n) {
	background-color: var(--table-stripe-bg);
}

/* --- BLOCKQUOTES --- */
blockquote {
	margin: 0 0 16px;
	padding: 0 1em;
	color: var(--blockquote-text);
	border-left: 0.25em solid var(--blockquote-border);
}

/* --- LISTS --- */
ul,
ol {
	padding-left: 2em;
	margin-bottom: 16px;
}

/* --- MOBILE MENU COMPONENTS --- */
.menu-toggle {
	display: none;
	position: fixed;
	top: 15px;
	right: 15px;
	z-index: 1100;
	background: var(--bg-color);
	border: 1px solid var(--border-color);
	color: var(--text-color);
	padding: 10px;
	border-radius: 6px;
	cursor: pointer;
	box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.menu-overlay {
	display: none;
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: rgba(0, 0, 0, 0.5);
	z-index: 900;
	opacity: 0;
	transition: opacity 0.3s ease;
}

/* --- MOBILE RESPONSIVENESS --- */
@media (max-width: 768px) {
	body {
		display: block;
	}

	.menu-toggle {
		display: block;
	}

	nav {
		position: fixed;
		top: 0;
		left: 0;
		height: 100vh;
		width: 280px;
		max-height: none;
		transform: translateX(-100%);
		transition: transform 0.3s ease-in-out;
		z-index: 1000;
		border-right: 1px solid var(--border-color);
		box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
		border-bottom: none;
	}

	nav.open {
		transform: translateX(0);
	}

	.menu-overlay.open {
		display: block;
		opacity: 1;
	}

	main {
		margin-left: 0;
		padding: 60px 20px 20px 20px;
		width: 100%;
	}

	h1 {
		font-size: 1.6em;
		margin-top: 0;
	}
}