/**
 * Single Post / Service Detail Page — CSS.
 * Layout 2 cột Desktop + Mobile Accordion TOC thông minh, tối ưu Core Web Vitals (CLS = 0, FID/INP).
 *
 * @package TMNhanPhat
 */

/* ==================== BIẾN CỤC BỘ & NỀN ==================== */
.single {
	--single-surface: #ffffff;
	--single-page-bg: #f8fafc;
	--single-border: #e2e8f0;
	--single-border-subtle: #f1f5f9;
	--single-text-title: #0f172a;
	--single-text-body: #334155;
	--single-text-muted: #64748b;
	--single-primary: var(--color-primary, #046AB5);
	--single-primary-light: #f0f7fd;
	--single-primary-hover: #0284c7;
	--single-red: #E31F2B;
	background-color: var(--single-page-bg);
}

.single > .container {
	padding-block: clamp(20px, 3.5vw, 44px);
	max-width: 1240px;
}

/* ==================== LAYOUT 2 CỘT ==================== */
.single-layout {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(280px, 290px);
	gap: clamp(24px, 2.5vw, 32px);
	align-items: stretch;
}

/* Cột trái: Card chứa nội dung chính */
.single-layout__main {
	min-width: 0;
	align-self: start;
	background: var(--single-surface);
	border: 1px solid var(--single-border);
	border-radius: 10px;
	padding: clamp(20px, 3vw, 36px);
	box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.single-layout__main .breadcrumb {
	margin-bottom: 20px;
}

/* ==================== CONTENT ARTICLE ==================== */
.single-content {
	min-width: 0;
}

.single-content__header {
	margin-bottom: 20px;
}

.single-content__title {
	margin: 0 0 14px;
	color: var(--single-text-title);
	font-size: clamp(22px, 3vw, 32px);
	font-weight: 800;
	line-height: 1.32;
	letter-spacing: -0.02em;
}

.single-content__meta {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 6px 14px;
	margin: 0;
	padding-bottom: 18px;
	border-bottom: 1px solid var(--single-border-subtle);
	color: var(--single-text-muted);
	font-size: 13.5px;
}

.single-content__author {
	font-weight: 600;
	color: var(--single-text-title);
}

/* Thumbnail Featured Image — giữ đúng ratio 16:9 chống CLS */
.single-content__thumbnail {
	position: relative;
	margin-bottom: 26px;
	border-radius: 10px;
	overflow: hidden;
	aspect-ratio: 16 / 9;
	background-color: var(--single-border-subtle);
}

.single-content__thumbnail img {
	display: block;
	width: 100%;
	height: 100%;
	object-fit: cover;
	border-radius: 10px;
}

/* Slot đặt TOC trên mobile */
.single-content__toc-slot {
	width: 100%;
}

.single-content__toc-slot:has(.toc) {
	margin-bottom: 24px;
}

/* Nội dung bài viết (.entry-content) — Typography chuẩn SEO */
.single-content__body {
	min-width: 0;
	color: var(--single-text-body);
	font-size: clamp(15.5px, 1.05vw, 16.5px);
	line-height: 1.75;
	overflow-wrap: anywhere;
	word-break: break-word;
}

.single-content__body > :first-child {
	margin-top: 0;
}

.single-content__body p {
	margin: 0 0 1.25em;
}

.single-content__body h2,
.single-content__body h3,
.single-content__body h4 {
	color: var(--single-text-title);
	scroll-margin-top: 100px;
}

.single-content__body h2 {
	margin: 36px 0 14px;
	font-size: clamp(20px, 2.2vw, 26px);
	font-weight: 700;
	line-height: 1.35;
}

.single-content__body h3 {
	margin: 26px 0 10px;
	font-size: clamp(17px, 1.8vw, 21px);
	font-weight: 700;
	line-height: 1.4;
}

.single-content__body h4 {
	margin: 20px 0 8px;
	font-size: clamp(15px, 1.5vw, 18px);
	font-weight: 600;
}

.single-content__body a {
	color: var(--single-primary);
	text-decoration: underline;
	text-underline-offset: 3px;
	font-weight: 500;
	transition: color 0.2s ease;
}

.single-content__body a:hover,
.single-content__body a:focus-visible {
	color: var(--single-red);
}

.single-content__body ul,
.single-content__body ol {
	margin: 0 0 1.25em;
	padding-left: 24px;
}

.single-content__body li {
	margin-bottom: 6px;
}

.single-content__body img {
	display: block;
	max-width: 100%;
	height: auto;
	border-radius: 10px;
	margin: 20px auto;
}

.single-content__body blockquote {
	margin: 24px 0;
	padding: 14px 20px;
	border-left: 4px solid var(--single-primary);
	background: #f8fafc;
	border-radius: 0 10px 10px 0;
	color: #475569;
	font-style: italic;
}

.single-content__body table {
	display: block;
	width: 100%;
	max-width: 100%;
	overflow-x: auto;
	-webkit-overflow-scrolling: touch;
	border-collapse: collapse;
	margin: 24px 0;
}

.single-content__body th,
.single-content__body td {
	padding: 10px 14px;
	border: 1px solid var(--single-border);
	font-size: 14.5px;
}

.single-content__body th {
	background: #f8fafc;
	font-weight: 700;
	color: var(--single-text-title);
}

.single-content__tags {
	margin-top: 24px;
	padding-top: 16px;
	border-top: 1px solid var(--single-border-subtle);
	color: var(--single-text-muted);
	font-size: 13.5px;
}

/* ==================== ASIDE / TOC ==================== */
.single-layout__aside {
	min-width: 0;
	align-self: stretch;
}

.toc {
	position: sticky;
	top: calc(var(--header-height, 72px) + 20px);
	max-height: calc(100vh - var(--header-height, 72px) - 40px);
	display: flex;
	flex-direction: column;
	background: var(--single-surface);
	border: 1px solid var(--single-border);
	border-radius: 10px;
	padding: 20px;
	box-shadow: 0 4px 18px rgba(0, 0, 0, 0.03);
	overflow: hidden;
}

.toc__toggle {
	display: flex;
	width: 100%;
	align-items: center;
	justify-content: space-between;
	padding: 0;
	border: 0;
	background: transparent;
	color: var(--single-text-title);
	font: inherit;
	text-align: left;
	pointer-events: none;
}

.toc__title {
	display: flex;
	align-items: center;
	gap: 8px;
	font-size: 16px;
	font-weight: 700;
	color: var(--single-text-title);
}

.toc__title svg {
	color: var(--single-primary);
	flex-shrink: 0;
}

.toc__toggle-label,
.toc__chevron {
	display: none;
}

.toc__content {
	display: block !important;
	max-height: calc(100vh - var(--header-height, 72px) - 120px);
	margin-top: 14px;
	overflow-y: auto;
	overscroll-behavior: contain;
}

.toc__list {
	margin: 0;
	padding: 0;
	list-style: none;
	display: flex;
	flex-direction: column;
	gap: 2px;
}

.toc__item a {
	display: flex;
	align-items: center;
	position: relative;
	padding: 7px 10px 7px 12px;
	border-left: 2.5px solid var(--single-border);
	color: var(--single-text-muted);
	font-size: 13.5px;
	line-height: 1.45;
	text-decoration: none;
	border-radius: 0 6px 6px 0;
	min-height: 38px;
	transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.toc__item--h3 a {
	padding-left: 22px;
	font-size: 12.5px;
}

.toc__item--h3 a::before {
	content: "└ ";
	margin-right: 4px;
	color: #94a3b8;
	font-size: 11px;
	opacity: 0.75;
}

.toc__item a:hover,
.toc__item a.is-active {
	border-left-color: var(--single-primary);
	background: var(--single-primary-light);
	color: var(--single-primary);
	font-weight: 600;
}

.toc__item--h3 a:hover::before,
.toc__item--h3 a.is-active::before {
	color: var(--single-primary);
	opacity: 1;
}

/* ==================== SHARE BOX ==================== */
.share-box {
	display: flex;
	align-items: center;
	gap: 10px;
	margin-top: 24px;
	padding-top: 20px;
	border-top: 1px solid var(--single-border-subtle);
}

.share-box__label {
	font-size: 14px;
	font-weight: 600;
	color: var(--single-text-body);
}

.share-box__link {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-height: 38px;
	padding: 6px 16px;
	border: 1px solid var(--single-border);
	border-radius: 10px;
	color: var(--single-text-body);
	font-size: 13.5px;
	font-weight: 500;
	text-decoration: none;
	transition: all 0.2s ease;
}

.share-box__link:hover,
.share-box__link:focus-visible {
	border-color: var(--single-primary);
	color: var(--single-primary);
	background: var(--single-primary-light);
}

/* ==================== AUTHOR BIO BOX ==================== */
.author-box {
	display: flex;
	align-items: flex-start;
	gap: 20px;
	margin-top: 28px;
	padding: 24px;
	background: var(--single-surface);
	border: 1px solid #eef2f6;
	border-left: 4px solid var(--single-primary);
	border-radius: 10px;
	box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
}

.author-box__avatar {
	flex-shrink: 0;
}

.author-box__img {
	display: block;
	width: 64px;
	height: 64px;
	border-radius: 50%;
	object-fit: cover;
	box-shadow: 0 0 0 3px #ffffff, 0 0 0 4px rgba(4, 106, 181, 0.2);
}

.author-box__body {
	flex: 1;
	min-width: 0;
}

.author-box__label {
	margin: 0 0 4px;
	color: var(--single-primary);
	font-size: 12px;
	font-weight: 700;
	letter-spacing: 0.06em;
	text-transform: uppercase;
}

.author-box__name {
	margin: 0 0 6px;
	font-size: 17px;
	font-weight: 700;
	line-height: 1.3;
}

.author-box__name a {
	color: var(--single-text-title);
	text-decoration: none;
	transition: color 0.2s ease;
}

.author-box__name a:hover {
	color: var(--single-primary);
}

.author-box__bio {
	margin: 0 0 12px;
	color: #4b5563;
	font-size: 14px;
	line-height: 1.6;
	display: -webkit-box;
	-webkit-line-clamp: 3;
	-webkit-box-orient: vertical;
	overflow: hidden;
}

.author-box__meta {
	display: flex;
	flex-wrap: wrap;
	gap: 6px 18px;
}

.author-box__meta-item {
	display: inline-flex;
	align-items: center;
	gap: 5px;
	color: #6b7280;
	font-size: 13px;
}

.author-box__icon {
	color: var(--single-primary);
	flex-shrink: 0;
}

/* ==================== RELATED SECTION ==================== */
.single-related-wrap {
	padding-block: clamp(36px, 5vw, 60px);
	background: #f8fafc;
	border-top: 1px solid #eef2f6;
}

.related-posts__header {
	text-align: center;
	margin-bottom: 28px;
}

.related-posts__title {
	margin: 0 0 8px;
	color: var(--single-text-title);
	font-size: clamp(22px, 2.5vw, 28px);
	font-weight: 800;
}

.related-posts__subtitle {
	margin: 0;
	color: var(--single-text-muted);
	font-size: 14.5px;
}

.related-posts__grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 24px;
}

.related-card {
	display: flex;
	flex-direction: column;
	background: var(--single-surface);
	border: 1px solid #eef2f6;
	border-radius: 10px;
	overflow: hidden;
	box-shadow: 0 4px 14px rgba(0, 0, 0, 0.03);
	transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.related-card:hover {
	transform: translateY(-4px);
	box-shadow: 0 12px 28px rgba(0, 0, 0, 0.06);
	border-color: rgba(4, 106, 181, 0.35);
}

.related-card__thumb {
	position: relative;
	aspect-ratio: 16 / 9;
	overflow: hidden;
	display: block;
	background-color: var(--single-border-subtle);
}

.related-card__thumb img {
	display: block;
	width: 100%;
	height: 100%;
	object-fit: cover;
	transition: transform 0.35s ease;
}

.related-card:hover .related-card__thumb img {
	transform: scale(1.04);
}

.related-card__thumb--no-img {
	display: flex;
	align-items: center;
	justify-content: center;
	color: #94a3b8;
}

.related-card__body {
	display: flex;
	flex-direction: column;
	flex: 1;
	padding: 16px 18px 18px;
}

.related-card__title {
	margin: 0 0 8px;
	font-size: 16px;
	font-weight: 700;
	line-height: 1.4;
}

.related-card__title a {
	color: var(--single-text-title);
	text-decoration: none;
	display: -webkit-box;
	-webkit-line-clamp: 2;
	-webkit-box-orient: vertical;
	overflow: hidden;
	transition: color 0.2s ease;
}

.related-card__title a:hover {
	color: var(--single-primary);
}

.related-card__excerpt {
	margin: 0 0 14px;
	color: var(--single-text-muted);
	font-size: 13.5px;
	line-height: 1.5;
	display: -webkit-box;
	-webkit-line-clamp: 2;
	-webkit-box-orient: vertical;
	overflow: hidden;
}

.related-card__footer {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 10px;
	margin-top: auto;
	padding-top: 10px;
	border-top: 1px solid var(--single-border-subtle);
	font-size: 12.5px;
	color: #94a3b8;
}

.related-card__meta-item {
	display: inline-flex;
	align-items: center;
	gap: 4px;
}

.related-card__icon {
	flex-shrink: 0;
	color: #94a3b8;
}

/* ==================== RESPONSIVE: TABLET (< 1024px) ==================== */
@media (max-width: 1023px) {
	.single-layout {
		display: block;
	}

	.single-layout__aside {
		display: none;
	}

	.single-layout__main {
		padding: 24px 20px;
	}

	/* TOC chuyển thành Accordion Dropdown thông minh */
	.toc {
		position: static;
		max-height: none;
		padding: 0;
		border: 1px solid var(--single-border);
		border-radius: 10px;
		background: #ffffff;
		overflow: hidden;
	}

	.toc__toggle {
		pointer-events: auto;
		cursor: pointer;
		min-height: 48px;
		padding: 12px 16px;
		background: #f8fafc;
		border: none;
		display: flex;
		align-items: center;
		justify-content: space-between;
		width: 100%;
	}

	.toc__toggle-label,
	.toc__chevron {
		display: block;
	}

	.toc__toggle-label {
		color: var(--single-primary);
		font-size: 13px;
		font-weight: 600;
		margin-left: auto;
		margin-right: 6px;
	}

	.toc__chevron {
		color: var(--single-primary);
		transition: transform 0.25s ease;
		flex-shrink: 0;
	}

	.toc__toggle[aria-expanded="true"] .toc__chevron {
		transform: rotate(180deg);
	}

	.toc__content {
		display: none;
		max-height: 55vh;
		overflow-y: auto;
		padding: 12px 14px 16px;
		margin-top: 0;
		border-top: 1px solid var(--single-border-subtle);
	}

	.toc__toggle[aria-expanded="true"] + .toc__content {
		display: block;
	}

	.toc__item a {
		min-height: 44px;
		padding: 10px 12px 10px 14px;
	}

	/* Related Grid trên Tablet: 2 cột */
	.related-posts__grid {
		grid-template-columns: repeat(2, 1fr);
		gap: 18px;
	}
}

/* ==================== RESPONSIVE: MOBILE (< 768px) ==================== */
@media (max-width: 767px) {
	.single > .container {
		padding-block: 16px 32px;
		padding-inline: 14px;
	}

	.single-layout__main {
		padding: 18px 14px;
		border-radius: 10px;
	}

	.single-content__title {
		font-size: 22px;
		margin-bottom: 12px;
	}

	.single-content__meta {
		font-size: 12.5px;
		gap: 4px 10px;
		padding-bottom: 14px;
		margin-bottom: 18px;
	}

	.single-content__body {
		font-size: 15.5px;
		line-height: 1.7;
	}

	.single-content__body h2 {
		font-size: 19px;
		margin: 28px 0 10px;
		scroll-margin-top: 80px;
	}

	.single-content__body h3 {
		font-size: 17px;
		margin: 22px 0 8px;
		scroll-margin-top: 80px;
	}

	/* Author Box mobile: xếp dọc gọn gàng */
	.author-box {
		flex-direction: column;
		align-items: center;
		text-align: center;
		padding: 20px 16px;
		gap: 14px;
	}

	.author-box__img {
		width: 56px;
		height: 56px;
	}

	.author-box__meta {
		justify-content: center;
	}

	/* Related Grid trên Mobile: 1 cột */
	.related-posts__grid {
		grid-template-columns: 1fr;
		gap: 16px;
	}
}

/* ==================== REDUCED MOTION ==================== */
@media (prefers-reduced-motion: reduce) {
	.related-card,
	.related-card__thumb img,
	.toc__chevron,
	.toc__item a,
	.share-box__link {
		transition: none !important;
	}
}