/* =========================================================
   SINGLE / PAGE - Layout 2 cột, Mục lục, CTA tải, Sidebar
   ========================================================= */

.single-layout {
	display: grid;
	grid-template-columns: 1fr 340px;
	gap: 40px;
	align-items: start;
	padding-block: 40px var(--section-spacing);
}

.single-layout__main {
	min-width: 0;
}

.single-layout__sidebar {
	display: flex;
	flex-direction: column;
	gap: 24px;
	position: sticky;
	top: 96px;
}

@media (max-width: 1024px) {
	.single-layout {
		grid-template-columns: 1fr;
	}

	.single-layout__sidebar {
		position: static;
	}
}

/* ---- Header bài viết ---- */
.single-document__title {
	margin-bottom: 12px;
}

.single-document__meta {
	display: flex;
	gap: 16px;
	flex-wrap: wrap;
	color: var(--color-text-muted);
	font-size: 14px;
	margin-bottom: 24px;
}

.single-document__meta .meta-item {
	display: inline-flex;
	align-items: center;
	gap: 4px;
}

.meta-item--categories {
	flex-wrap: wrap;
	row-gap: 4px;
}

.meta-item--categories a {
	color: var(--color-primary);
}

.meta-item--categories a:hover {
	text-decoration: underline;
}

.meta-item__sep {
	color: var(--color-border);
	margin: 0 2px;
}

/* ---- Like / Dislike ---- */
.vote-box {
	display: flex;
	align-items: center;
	gap: 10px;
	flex-wrap: wrap;
	margin-bottom: 24px;
}

.vote-box__btn {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	padding: 8px 16px;
	border-radius: var(--radius-full);
	border: 1px solid var(--color-border);
	background: var(--color-bg);
	color: var(--color-text-muted);
	font-size: 13px;
	font-weight: 600;
	cursor: pointer;
	transition: border-color var(--transition-fast), color var(--transition-fast), background-color var(--transition-fast);
}

.vote-box__btn:hover {
	border-color: var(--color-primary);
	color: var(--color-primary);
}

.vote-box__btn:disabled {
	opacity: 0.6;
	cursor: default;
}

.vote-box__btn--like[aria-pressed="true"] {
	background: var(--color-success);
	border-color: var(--color-success);
	color: #fff;
}

.vote-box__btn--dislike[aria-pressed="true"] {
	background: var(--color-text-muted);
	border-color: var(--color-text-muted);
	color: #fff;
}

.vote-box__percent {
	font-size: 13px;
	color: var(--color-text-muted);
}

.vote-box__download-btn {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	margin-left: auto;
	padding: 8px 18px;
	border-radius: var(--radius-full);
	background: var(--color-primary);
	color: #fff;
	font-size: 13px;
	font-weight: 600;
	transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.vote-box__download-btn:hover {
	background: var(--color-primary-dark);
	color: #fff;
	transform: translateY(-1px);
}

.vote-box__share-btn {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	padding: 8px 16px;
	border-radius: var(--radius-full);
	border: 1px solid var(--color-border);
	background: var(--color-bg);
	color: var(--color-text);
	font-size: 13px;
	font-weight: 600;
	cursor: pointer;
	transition: border-color var(--transition-fast), color var(--transition-fast);
}

.vote-box__share-btn:hover {
	border-color: var(--color-primary);
	color: var(--color-primary);
}

.vote-box__share-btn.is-copied {
	border-color: var(--color-success);
	color: var(--color-success);
}

#tlo-download-section {
	scroll-margin-top: 96px;
}

@media (max-width: 480px) {
	.vote-box__download-btn {
		margin-left: 0;
		width: 100%;
		justify-content: center;
	}

	.vote-box__share-btn {
		width: 100%;
		justify-content: center;
	}
}

/* ---- Khu vực "Chia sẻ tài liệu này" cuối bài ---- */
.share-box {
	margin: 40px 0 0;
	padding: 20px 24px;
	background: var(--color-bg-alt);
	border-radius: var(--radius-base);
	border: 1px solid var(--color-border);
}

.share-box__title {
	font-size: 17px;
	margin: 0 0 6px;
}

.share-box__desc {
	font-size: 13px;
	color: var(--color-text-muted);
	margin: 0 0 14px;
}

.share-box__field {
	display: flex;
	gap: 10px;
	align-items: flex-start;
}

.share-box__textarea {
	flex: 1;
	min-width: 0;
	padding: 10px 14px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-sm);
	background: #fff;
	font-family: inherit;
	font-size: 13px;
	color: var(--color-text);
	line-height: 1.6;
	resize: vertical;
}

.share-box__copy-btn {
	flex: 0 0 auto;
	display: inline-flex;
	align-items: center;
	gap: 6px;
	padding: 10px 20px;
	border: none;
	border-radius: var(--radius-sm);
	background: var(--color-primary);
	color: #fff;
	font-size: 13px;
	font-weight: 600;
	cursor: pointer;
	transition: background-color var(--transition-fast);
}

.share-box__copy-btn:hover {
	background: var(--color-primary-dark);
}

.share-box__copy-btn.is-copied {
	background: var(--color-success);
}

@media (max-width: 480px) {
	.share-box__field {
		flex-direction: column;
	}

	.share-box__copy-btn {
		width: 100%;
		justify-content: center;
	}
}

.single-document__thumbnail {
	margin: 0 0 24px;
	max-width: 400px;
	margin-left: auto;
	margin-right: auto;
}

.single-document__thumbnail img {
	width: 100%;
	display: block;
	border-radius: var(--radius-base);
	border: 1px solid var(--color-border);
	box-shadow: var(--shadow-base);
}

@media (max-width: 640px) {
	.single-document__thumbnail {
		max-width: 280px;
	}
}

/* ---- Mục lục ---- */
.toc-box {
	background: var(--color-primary-light);
	border: 1px solid var(--color-border);
	border-left: 4px solid var(--color-primary);
	border-radius: var(--radius-base);
	padding: 20px 24px;
	margin-bottom: 32px;
}

.toc-box__title {
	font-weight: 700;
	color: var(--color-primary);
	margin: 0 0 14px;
	font-size: 15px;
	display: flex;
	align-items: center;
	gap: 8px;
}

.toc-box__title::before {
	content: "";
	display: inline-block;
	width: 4px;
	height: 16px;
	background: var(--color-primary);
	border-radius: var(--radius-full);
}

.toc-box__list {
	list-style: none;
	counter-reset: toc-counter;
	display: flex;
	flex-direction: column;
	gap: 10px;
}

.toc-box__item {
	counter-increment: toc-counter;
}

.toc-box__item a {
	display: flex;
	align-items: baseline;
	gap: 10px;
	font-size: 14px;
	font-weight: 500;
	color: var(--color-text);
	transition: color var(--transition-fast);
}

.toc-box__item a::before {
	content: counter(toc-counter);
	flex: 0 0 auto;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 20px;
	height: 20px;
	border-radius: 50%;
	background: #fff;
	color: var(--color-primary);
	font-size: 12px;
	font-weight: 700;
	border: 1px solid var(--color-primary);
}

.toc-box__item a:hover {
	color: var(--color-primary);
}

/* ---- Nội dung bài viết ---- */
.single-document__content p {
	text-align: justify;
	text-justify: inter-word;
	line-height: 1.8;
}

.single-document__content h2 {
	margin-top: 40px;
	scroll-margin-top: 96px;
}

.single-document__content h3 {
	margin-top: 24px;
}

.single-document__content img {
	border-radius: var(--radius-base);
}

.single-document__content ul,
.single-document__content ol {
	list-style: revert;
	margin: 0 0 16px;
	padding-left: 24px;
}

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

/* ---- Khung nhúng xem trước tài liệu (Google Drive iframe) ---- */
.drive-embed {
	margin: 32px 0;
	border-radius: var(--radius-base);
	overflow: hidden;
	border: 1px solid var(--color-border);
	box-shadow: var(--shadow-sm);
}

.drive-embed__toolbar {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 12px;
	padding: 10px 16px;
	background: var(--color-bg-alt);
	border-bottom: 1px solid var(--color-border);
}

.drive-embed__label {
	font-size: 13px;
	font-weight: 600;
	color: var(--color-text-muted);
}

.drive-embed__frame-wrap {
	position: relative;
}

.drive-embed iframe {
	display: block;
	width: 100%;
	height: 480px;
	border: none;
}

/* Lớp trong suốt chặn click vào icon "mở rộng/pop-out" mà Google Drive tự vẽ
   ở góc trên phải bên trong iframe - không xoá được icon (do giới hạn
   Same-Origin Policy), chỉ chặn được thao tác bấm vào đúng vị trí đó. Kích
   thước ước lượng theo icon thực tế của Drive preview (~48x48px). */
.drive-embed__block-popout {
	position: absolute;
	top: 0;
	right: 0;
	width: 56px;
	height: 56px;
	background: transparent;
	pointer-events: auto;
	z-index: 2;
}

@media (max-width: 640px) {
	.drive-embed iframe {
		height: 360px;
	}

	.drive-embed__toolbar {
		flex-wrap: wrap;
	}
}

/* ---- CTA tải tài liệu ---- */
.download-cta {
	display: flex;
	align-items: center;
	gap: 18px;
	background: var(--color-primary);
	color: #fff;
	border-radius: var(--radius-base);
	padding: 20px 28px;
	margin: 36px 0;
	box-shadow: var(--shadow-base);
	transition: background-color var(--transition-base), transform var(--transition-fast), box-shadow var(--transition-base);
}

.download-cta:hover {
	background: var(--color-primary-dark);
	color: #fff;
	transform: translateY(-2px);
	box-shadow: var(--shadow-lg);
}

.download-cta__icon {
	flex: 0 0 auto;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 48px;
	height: 48px;
	border-radius: var(--radius-sm);
	background: rgba(255, 255, 255, 0.18);
	font-size: 24px;
}

.download-cta__text {
	display: flex;
	flex-direction: column;
	gap: 4px;
}

.download-cta__text strong {
	font-size: 16px;
	line-height: 1.4;
}

.download-cta__sub {
	font-size: 13px;
	opacity: 0.85;
}

/* ---- Link đáp án / Video bài giảng (phụ, cạnh CTA tải chính) ---- */
.extra-links-row {
	display: flex;
	flex-wrap: wrap;
	gap: 12px;
	margin-top: -8px;
	margin-bottom: 32px;
}

.extra-link-btn {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	padding: 10px 18px;
	border-radius: var(--radius-full);
	border: 1px solid var(--color-border);
	background: var(--color-bg);
	color: var(--color-text);
	font-size: 14px;
	font-weight: 600;
	transition: border-color var(--transition-fast), color var(--transition-fast), background-color var(--transition-fast);
}

.extra-link-btn:hover {
	border-color: var(--color-primary);
	color: var(--color-primary);
	background: var(--color-primary-light);
}

/* ---- Tags ---- */
.single-document__tags {
	display: flex;
	gap: 8px;
	flex-wrap: wrap;
	margin-top: 24px;
}

.tag {
	padding: 6px 14px;
	border-radius: var(--radius-full);
	background: var(--color-bg-alt);
	font-size: 13px;
	color: var(--color-text-muted);
}

.tag:hover {
	background: var(--color-primary-light);
	color: var(--color-primary);
}

/* ---- Related section (dùng chung .archive-card từ archive.css, nhưng grid ---- */
/* riêng vì cột chính ở đây hẹp hơn trang archive full-width) ---- */
.related-section {
	margin-top: 48px;
	padding-top: 40px;
	border-top: 1px solid var(--color-border);
}

.related-section .section-title {
	margin-bottom: 20px;
	display: flex;
	align-items: center;
	gap: 10px;
}

.related-section .section-title::before {
	content: "";
	display: inline-block;
	width: 4px;
	height: 20px;
	background: var(--color-primary);
	border-radius: var(--radius-full);
}

.related-section .archive-grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: var(--card-spacing);
}

.related-section .archive-card {
	box-shadow: var(--shadow-sm);
	transition: box-shadow var(--transition-base), transform var(--transition-fast);
}

.related-section .archive-card:hover {
	box-shadow: var(--shadow-base);
	transform: translateY(-3px);
}

@media (max-width: 1024px) {
	.related-section .archive-grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (max-width: 560px) {
	.related-section .archive-grid {
		grid-template-columns: 1fr;
	}
}

/* ---- Comments ---- */
.single-comments {
	margin-top: 48px;
}

.comments-area {
	max-width: 800px;
}

.comments-title {
	margin-bottom: 20px;
}

.comment-list {
	list-style: none;
	display: flex;
	flex-direction: column;
	gap: 16px;
	margin: 0 0 32px;
}

.comment-item {
	background: var(--color-bg-alt);
	border-radius: var(--radius-base);
	padding: 16px 20px;
}

.comment-item__header {
	display: flex;
	align-items: baseline;
	gap: 10px;
	margin-bottom: 6px;
	flex-wrap: wrap;
}

.comment-item__author {
	font-weight: 700;
	color: var(--color-text);
	font-size: 14px;
}

.comment-item__date {
	font-size: 12px;
	color: var(--color-text-muted);
}

.comment-item__text {
	font-size: 14px;
	color: var(--color-text);
	line-height: 1.6;
}

.comment-item__text p:last-child {
	margin-bottom: 0;
}

.comment-respond {
	background: var(--color-bg-alt);
	border-radius: var(--radius-base);
	padding: 24px;
}

.comment-reply-title {
	margin: 0 0 16px;
	font-size: 18px;
}

.comment-form-author,
.comment-form-comment {
	display: flex;
	flex-direction: column;
	gap: 6px;
	margin-bottom: 16px;
}

.comment-form label {
	font-size: 14px;
	font-weight: 600;
	color: var(--color-text);
}

.comment-form label .required {
	color: var(--color-primary);
}

.comment-form input[type="text"],
.comment-form textarea {
	border: 1px solid var(--color-border);
	border-radius: var(--radius-sm);
	padding: 12px 14px;
	font-size: 14px;
	font-family: inherit;
	color: var(--color-text);
	background: #fff;
	transition: border-color var(--transition-fast);
}

.comment-form input[type="text"]:focus,
.comment-form textarea:focus {
	border-color: var(--color-primary);
	outline: none;
}

.comment-form textarea {
	resize: vertical;
	min-height: 120px;
}

.comment-form .form-submit {
	margin: 0;
}

.comment-form input[type="submit"] {
	background: var(--color-primary);
	color: #fff;
	border: none;
	border-radius: var(--radius-sm);
	padding: 12px 28px;
	font-size: 14px;
	font-weight: 600;
	cursor: pointer;
	transition: background-color var(--transition-fast);
}

.comment-form input[type="submit"]:hover {
	background: var(--color-primary-dark);
}

.no-comments {
	color: var(--color-text-muted);
	margin-bottom: 20px;
}

/* ---- Sidebar: Widget "Tài liệu mới" ---- */
.single-layout__sidebar .widget-box {
	background: #fff;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-base);
	padding: 22px 20px;
	box-shadow: var(--shadow-sm);
}

.single-layout__sidebar .widget-box__header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	margin-bottom: 18px;
	padding-bottom: 14px;
	border-bottom: 2px solid var(--color-primary-light);
}

.single-layout__sidebar .widget-box__title {
	font-size: 16px;
	font-weight: 700;
	margin: 0;
	display: flex;
	align-items: center;
	gap: 8px;
}

.single-layout__sidebar .widget-box__title::before {
	content: "";
	display: inline-block;
	width: 4px;
	height: 16px;
	background: var(--color-primary);
	border-radius: var(--radius-full);
}

.single-layout__sidebar .widget-box__more {
	font-size: 12px;
	font-weight: 600;
	color: var(--color-primary);
	white-space: nowrap;
	transition: color var(--transition-fast);
}

.single-layout__sidebar .widget-box__more:hover {
	color: var(--color-primary-dark);
}

.single-layout__sidebar .news-list {
	display: flex;
	flex-direction: column;
	gap: 16px;
}

.single-layout__sidebar .news-list__item {
	display: flex;
	gap: 12px;
	padding-bottom: 16px;
	border-bottom: 1px solid var(--color-border);
}

.single-layout__sidebar .news-list__item:last-child {
	padding-bottom: 0;
	border-bottom: none;
}

.single-layout__sidebar .news-list__thumb {
	flex: 0 0 72px;
	width: 72px;
	height: 72px;
	border-radius: var(--radius-sm);
	overflow: hidden;
	background: var(--color-bg-alt);
	transition: opacity var(--transition-fast);
}

.single-layout__sidebar .news-list__thumb:hover {
	opacity: 0.85;
}

.single-layout__sidebar .news-list__thumb img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
}

.single-layout__sidebar .news-list__body {
	display: flex;
	flex-direction: column;
	justify-content: center;
	gap: 6px;
	min-width: 0;
}

.single-layout__sidebar .news-list__title {
	font-size: 13.5px;
	font-weight: 600;
	color: var(--color-text);
	line-height: 1.45;
	display: -webkit-box;
	-webkit-line-clamp: 2;
	-webkit-box-orient: vertical;
	overflow: hidden;
	transition: color var(--transition-fast);
}

.single-layout__sidebar .news-list__title:hover {
	color: var(--color-primary);
}

.single-layout__sidebar .news-list__date {
	font-size: 12px;
	color: var(--color-text-muted);
}
/* =========================================================
   HỘP NHIỆM VỤ NHẬN MÃ TẢI TÀI LIỆU (inc/download-mission.php,
   JS: openMissionGate() trong main.js)
   ========================================================= */
.mission-gate {
	position: fixed;
	inset: 0;
	z-index: 100000;
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 16px;
	background: rgba(16, 18, 23, 0.55);
}

.mission-gate__box {
	position: relative;
	width: 100%;
	max-width: 520px;
	max-height: calc(100vh - 32px);
	overflow-y: auto;
	padding: 28px 24px 24px;
	border-radius: var(--radius-lg);
	background: var(--color-bg);
	box-shadow: var(--shadow-lg);
	outline: none;
}

.mission-gate__close {
	position: absolute;
	top: 8px;
	right: 8px;
	width: 40px;
	height: 40px;
	border: 0;
	border-radius: var(--radius-full);
	background: transparent;
	color: var(--color-text-muted);
	font-size: 28px;
	line-height: 1;
	cursor: pointer;
}

.mission-gate__close:hover { background: var(--color-bg-alt); }

.mission-gate__title {
	margin: 0 32px 6px 0;
	font-size: 1.25rem;
	font-weight: 800;
}

.mission-gate__lead {
	margin: 0 0 16px;
	color: var(--color-text-muted);
}

.mission-gate__jump {
	display: block;
	width: 100%;
	margin: 0 0 18px;
	padding: 10px 14px;
	border: 2px dashed var(--color-primary);
	border-radius: var(--radius-sm);
	background: var(--color-primary-light);
	color: var(--color-primary-dark);
	font-weight: 700;
	cursor: pointer;
}

.mission-gate__steps {
	margin: 0;
	padding: 0;
	list-style: none;
	counter-reset: gate-step;
}

.mission-gate__step {
	position: relative;
	margin: 0 0 14px;
	padding: 14px 14px 14px 52px;
	border-radius: var(--radius-sm);
	background: var(--color-bg-alt);
	counter-increment: gate-step;
}

.mission-gate__step::before {
	content: counter(gate-step);
	position: absolute;
	top: 12px;
	left: 12px;
	display: grid;
	place-items: center;
	width: 28px;
	height: 28px;
	border-radius: 50%;
	background: var(--color-primary);
	color: #fff;
	font-weight: 800;
}

.mission-gate__step--final { background: var(--color-primary-light); }

.mission-gate__step-title {
	margin: 2px 0 6px;
	font-size: 1rem;
	font-weight: 800;
	line-height: 1.45;
}

.mission-gate__note {
	margin: 0 0 10px;
	color: var(--color-text-muted);
	font-size: 0.9rem;
	line-height: 1.5;
}

.mission-gate__actions { margin: 0 0 8px; }

.mission-gate__img {
	display: block;
	width: 100%;
	height: auto;
	margin-top: 8px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-sm);
	background: #fff;
}

.mission-gate__img + .mission-gate__note { margin-top: 12px; }

.mission-gate__caption {
	margin: 4px 0 0;
	color: var(--color-text-muted);
	font-size: 0.75rem;
	font-style: italic;
	text-align: right;
}

.mission-gate__keyword {
	display: inline-block;
	padding: 2px 10px;
	border-radius: var(--radius-sm);
	background: var(--color-primary-light);
	color: var(--color-primary-dark);
	font-weight: 800;
}

.mission-gate__copy,
.mission-gate__google {
	display: inline-block;
	margin: 4px 4px 0 0;
	padding: 4px 12px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-full);
	background: var(--color-bg);
	color: var(--color-text);
	font-size: 0.875rem;
	font-weight: 600;
	text-decoration: none;
	cursor: pointer;
}

.mission-gate__form { display: flex; gap: 8px; margin-top: 8px; }

/* Máy tính: hộp rộng hơn, chữ to hơn; ảnh chụp màn hình điện thoại giới hạn
   chiều rộng để ảnh dài (câu hỏi) không bị phóng quá to. */
@media (min-width: 768px) {
	.mission-gate__box { max-width: 680px; padding: 32px 32px 28px; }
	.mission-gate__title { font-size: 1.5rem; }
	.mission-gate__lead { font-size: 1.05rem; }
	.mission-gate__step { padding: 18px 20px 18px 62px; }
	.mission-gate__step::before { top: 16px; left: 18px; width: 32px; height: 32px; }
	.mission-gate__step-title { font-size: 1.1rem; }
	.mission-gate__note { font-size: 0.95rem; }
	.mission-gate__img { max-width: 440px; }
}

@media (max-width: 480px) {
	.mission-gate { padding: 8px; }
	.mission-gate__box { max-height: calc(100vh - 16px); padding: 24px 14px 16px; }
	.mission-gate__step { padding: 12px 10px 12px 44px; }
	.mission-gate__step::before { left: 8px; }
}

.mission-gate__input {
	flex: 1;
	min-width: 0;
	padding: 12px 14px;
	border: 2px solid var(--color-border);
	border-radius: var(--radius-sm);
	font-size: max(16px, 1.25rem);
	font-weight: 700;
	letter-spacing: 0.2em;
	text-align: center;
}

.mission-gate__input:focus { border-color: var(--color-primary); outline: none; }

.mission-gate__input::placeholder {
	letter-spacing: normal;
	font-weight: 500;
	font-size: 1rem;
}

.mission-gate__submit,
.mission-gate__download {
	padding: 12px 20px;
	border: 0;
	border-radius: var(--radius-sm);
	background: var(--color-primary);
	color: #fff;
	font-weight: 800;
	cursor: pointer;
	text-align: center;
	text-decoration: none;
}

.mission-gate__submit:hover,
.mission-gate__download:hover { background: var(--color-primary-dark); color: #fff; }

.mission-gate__submit:disabled { opacity: 0.6; cursor: wait; }

.mission-gate__download { display: block; font-size: 1.05rem; }

.mission-gate__error {
	margin: 12px 0 0;
	padding: 10px 12px;
	border-radius: var(--radius-sm);
	background: var(--color-primary-light);
	color: var(--color-error);
	font-weight: 600;
}