/* Bài viết: tiêu đề, ảnh bìa, nội dung (prose), chia sẻ, bài liên quan, thanh tiến độ đọc */
.reading-progress { position: fixed; left: 0; top: 0; right: 0; height: 3px; z-index: 150; pointer-events: none; }
.reading-progress span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--c-gold), #ff8a00); transition: width .1s linear; }

.post-single { min-width: 0; }
.post-single__head { display: grid; gap: 12px; justify-items: start; margin-bottom: 18px; }
.post-single__title { font-size: 31px; line-height: 1.3; color: var(--c-text); }
.post-meta { display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: 13px; color: var(--c-muted); }
.post-meta .meta__item { display: inline-flex; align-items: center; gap: 6px; }
.post-meta .ico { width: 15px; height: 15px; color: var(--c-brand); }
.post-single__cover { margin: 0 0 22px; }
.post-single__cover img { width: 100%; height: auto; aspect-ratio: 16 / 8.4; object-fit: cover; border-radius: 12px; box-shadow: var(--shadow-md); }

/* nội dung bài viết — cột đọc ≈ 780px */
.prose { max-width: 780px; font-size: 17px; line-height: 1.75; color: #222c44; overflow-wrap: anywhere; }
.prose > * + * { margin-top: 1.1em; }
.prose h2, .prose h3 { margin-top: 1.6em; line-height: 1.35; color: var(--c-royal); }
.prose h2 { font-size: 24px; }
.prose h3 { font-size: 20px; }
.prose a { color: var(--c-brand); text-decoration: underline; text-underline-offset: 3px; }
.prose a:hover { color: var(--c-blue-dark); }
.prose blockquote { margin-inline: 0; padding: 14px 20px; border-left: 4px solid var(--c-blue); background: var(--c-bg-blue); border-radius: 0 10px 10px 0; font-size: 16.5px; color: #1b2a50; }
.prose blockquote p + p { margin-top: .6em; }
.prose figure { margin-inline: 0; }
.prose figure > div { display: block; }
.prose img { width: 100%; height: auto; border-radius: 10px; }
.prose figcaption { margin-top: 8px; font-size: 13.5px; line-height: 1.5; color: var(--c-muted); text-align: center; font-style: italic; }
.prose figcaption p { margin: 0; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose table { width: 100%; border-collapse: collapse; font-size: 15px; }
.prose th, .prose td { border: 1px solid var(--c-line); padding: 8px 12px; text-align: left; }
.prose th { background: var(--c-bg-blue); }
.prose b, .prose strong { color: #12204a; }

.share { display: flex; align-items: center; gap: 10px; margin: 28px 0 8px; padding: 14px 0; border-top: 1px solid var(--c-line); border-bottom: 1px solid var(--c-line); }
.share__label { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 14px; margin-right: 4px; }
.share__label .ico { width: 18px; height: 18px; color: var(--c-brand); }
.share__btn { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; color: #fff; background: var(--c-brand); transition: transform var(--t-fast) ease, box-shadow var(--t-fast) ease; }
.share__btn .ico { width: 18px; height: 18px; }
.share__btn--fb { background: #1877f2; }
.share__btn--zalo { background: #0068ff; }
.share__btn--zalo .ico { width: 28px; height: 28px; }
.share__btn--mail { background: #5b6b8c; }
.share__btn--copy { background: var(--c-navy); }
.share__btn:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0, 20, 60, .3); }

.related { margin-top: 30px; }
.related__title { font-size: 20px; color: var(--c-royal); padding-bottom: 10px; margin-bottom: 16px; border-bottom: 2px solid var(--c-line); position: relative; }
.related__title::after { content: ""; position: absolute; left: 0; bottom: -2px; width: 90px; height: 2px; background: var(--c-blue); }
.related__grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.related-card { display: grid; gap: 10px; align-content: start; }
.related-card__thumb { aspect-ratio: 16 / 10; }
.related-card .post-card__title { font-size: 15px; font-weight: 700; }