/* === Giao diện chính === */

body {
	background-color: #f5f7fa;
	color: #1e2a38;
	font-family: 'Segoe UI', Roboto, sans-serif;
	padding: 2em;
	line-height: 1.6;
}

a {
	color: #007acc;
	text-decoration: none;
}

a:hover {
	text-decoration: underline;
}

code {
	background: #eaeef3;
	padding: 2px 6px;
	border-radius: 5px;
	font-family: 'Courier New', monospace;
}

pre {
	background: #eaeef3;
	padding: 1em;
	overflow-x: auto;
	border-left: 4px solid #007acc;
}

h1,
h2,
h3,
h4,
h5,
h6 {
	color: #003366;
	margin-top: 1.5em;
	border-bottom: 2px solid #ccc;
	padding-bottom: 0.3em;
}

blockquote {
	border-left: 4px solid #007acc;
	padding-left: 1em;
	background: #f0f8ff;
	color: #003366;
	margin: 1em 0;
}

table {
	border-collapse: collapse;
	width: 100%;
	margin-top: 1em;
}

table,
th,
td {
	border: 1px solid #ccc;
	padding: 0.5em;
	text-align: left;
}

hr {
	border: none;
	border-top: 1px dashed #aaa;
	margin: 2em 0;
}

/* === Layout chính (nội dung + TOC) === */

.site-container {
	display: flex;
	gap: 2em;
	max-width: 1400px;
	margin: 2em auto;
	padding: 0 1em;
}

main {
	flex: 1;
	min-width: 0;
	word-break: break-word;
	overflow-wrap: break-word;
}

/* === TOC Sidebar (bên trái) === */

#toc {
	position: sticky;
	top: 20px;
	max-height: 90vh;
	overflow-y: auto;
	padding-right: 1em;
	flex-shrink: 0;

	width: 250px;
	min-width: 200px;
	max-width: 300px;
	word-wrap: break-word;
	overflow-wrap: break-word;
	white-space: normal;
}

#toc h2 {
	margin-top: 0;
	font-size: 1.2em;
}

#toc ul {
	list-style: none;
	padding-left: 0;
}

#toc li {
	margin: 0.5em 0;
}

#toc a {
	display: block;
	line-height: 1.5em;
	word-break: break-word;
}

#toc a:hover {
	text-decoration: underline;
}

/* === Vùng nội dung Markdown === */

#markdown-content {
	background: #fff;
	padding: 2em;
	border-radius: 4px;
	box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
	color: #1e2a38;
	max-width: 100%;
}

#markdown-content img {
	max-width: 100%;
	height: auto;
	display: block;
}

/* === Toggle giữa full / normal width === */

#markdown-content.normal-width {
	max-width: 100%;
}

#markdown-content.full-width {
	max-width: none;
	width: 100%;
}


/* === Danh sách bài viết (li trong ul) === */

ul li a {
	display: block;
	padding: 0.75em 1em;
	margin: 0.5em 0;
	border-radius: 8px;
	background-color: #dad0d0;
	color: #0d47a1;
	text-decoration: none;
	font-weight: 500;
	box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
	transition: all 0.2s ease;
}

ul li a:hover {
	background-color: #e3f2fd;
	color: #1565c0;
	text-decoration: none;
	transform: translateY(-1px);
}


/* === Scroll to Top button === */

#scrollToTop {
	display: none;
	position: fixed;
	bottom: 20px;
	right: 20px;
	padding: 0.5em 1em;
	font-size: 1em;
	background: #007acc;
	color: #fff;
	border: none;
	border-radius: 5px;
	cursor: pointer;
}

#scrollToTop:hover {
	background: #005f99;
}

/* === Post time box === */

.post-time {
	font-size: 0.9em;
	color: #666;
	margin-bottom: 0.5em;
	padding: 0.5em 1em;
	background: rgba(0, 0, 0, 0.03);
	border-left: 4px solid #007acc;
	border-radius: 4px;
}


/* chỉnh kích thước image ở index.html */
.post-image {
	display: block;
	margin-bottom: 0.75em;
	/* giới hạn images container có thể vượt qua */
	max-width: 100%;
	max-height: 250px;
	height: auto;
	width: auto;
}

/* Highlight background cho section được chọn */
/* Highlight chỉ tiêu đề h2 */
.section-container section h2.active-heading {
	background-color: rgba(255, 223, 93, 0.4);
	padding: 0.2em 0.4em;
	border-radius: 4px;
	transition: background-color 0.3s ease;
}

.section-container {
	max-width: 800px;
	margin: 0 auto;
	padding: 0 1em;
}

.section-container section {
	margin-bottom: 2em;
}

#recommendations {
	margin-bottom: 2rem;
}

footer {
	margin-top: auto;
	text-align: center;
	padding: 1em;
	background: #f5f5f5;
	color: #333;
}