/* Guides, blog index and blog posts. Long-form text is written twice ([data-lang="en"] / [data-lang="vi"]);
   only the block matching <html lang> is shown (English by default, before any script runs). */
html:not([lang="vi"]) [data-lang="vi"], html[lang="vi"] [data-lang="en"] { display: none !important; }

.page-head { padding-top: 88px; max-width: 860px; }
.page-head h1 { font-size: clamp(42px, 6vw, 76px); margin-bottom: 20px; }
.page-head .lead { max-width: 40em; }
.nav-links a.active { color: var(--text); }

/* Guides: sticky table of contents + article column */
.docs { display: grid; grid-template-columns: 240px 1fr; gap: 56px; padding-top: 72px; align-items: start; }
.toc { position: sticky; top: 96px; display: flex; flex-direction: column; gap: 2px; font-size: 14.5px; }
.toc a { color: var(--muted); padding: 7px 12px; border-left: 2px solid var(--line); }
.toc a:hover { color: var(--text); border-left-color: var(--orange); }
.toc .toc-label { font: 600 11px var(--mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--orange); margin-bottom: 10px; }

.prose { max-width: 760px; min-width: 0; }
.prose > section { padding-bottom: 64px; margin-bottom: 64px; border-bottom: 1px solid var(--line); scroll-margin-top: 90px; }
.prose > section:last-child { border-bottom: 0; }
.prose h2 { font-size: clamp(30px, 3.6vw, 42px); max-width: none; }
.prose h3 { margin-top: 32px; }
.prose p, .prose li { color: #b3bbca; font-size: 17px; }
.prose p + p { margin-top: 14px; }
.prose ol, .prose ul { padding-left: 22px; margin: 16px 0; display: flex; flex-direction: column; gap: 10px; }
.prose li::marker { color: var(--orange); font-family: var(--mono); font-size: 0.85em; }
.prose strong { color: var(--text); }
.prose kbd { font: 600 12px var(--mono); color: var(--text); background: var(--panel-2); border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 6px; padding: 2px 7px; }
.prose pre { margin: 20px 0; padding: 18px 20px; border-radius: 14px; border: 1px solid var(--line); background: #0a0d12; color: #c9d1de; font-size: 13.5px; line-height: 1.75; overflow-x: auto; }
.prose pre .k { color: var(--cyan); }
.prose pre .s { color: #ffb37a; }
.prose pre .c { color: #5d6678; }
.guide-num { display: block; font: 600 12px var(--mono); letter-spacing: 0.14em; color: var(--orange); margin-bottom: 12px; }
.tip { margin: 22px 0; padding: 16px 18px; border-radius: 12px; border: 1px solid rgba(255, 107, 26, 0.35); background: var(--orange-soft); }
.tip p { color: var(--text); font-size: 15.5px; }
.tip b { font: 600 11px var(--mono); letter-spacing: 0.14em; color: var(--orange); display: block; margin-bottom: 6px; }
.table-wrap { overflow-x: auto; margin: 20px 0; }
.prose table { width: 100%; border-collapse: collapse; font-size: 15px; }
.prose th, .prose td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); color: #b3bbca; vertical-align: top; }
.prose th { font: 600 11px var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }

/* Blog index */
.posts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 64px; }
.post-card { display: flex; flex-direction: column; gap: 14px; padding: 28px; border-radius: var(--radius); border: 1px solid var(--line); background: linear-gradient(180deg, var(--panel-2), var(--panel)); transition: border-color 0.25s, transform 0.25s; }
.post-card:hover { border-color: rgba(255, 107, 26, 0.5); transform: translateY(-3px); }
.post-card:first-child { grid-column: span 2; padding: 44px; background: radial-gradient(700px 300px at 100% 0%, var(--orange-soft), transparent 70%), linear-gradient(180deg, var(--panel-2), var(--panel)); }
.post-card:first-child h2 { font-size: clamp(30px, 4vw, 48px); max-width: 20ch; }
.post-card h2 { font-size: 24px; margin: 0; max-width: none; }
.post-card .more { margin-top: auto; font: 600 13px var(--mono); color: var(--orange); }
.post-meta { font: 12px var(--mono); color: var(--muted); letter-spacing: 0.06em; }
.post-meta .tag { color: var(--orange); }

/* Single post */
.post { max-width: 760px; padding-top: 88px; }
.post h1 { font-size: clamp(38px, 5.4vw, 64px); margin: 18px 0 24px; }
.post .prose { margin-top: 48px; }
.post .prose h2 { font-size: 30px; margin-top: 48px; }
.back { font: 600 13px var(--mono); color: var(--muted); }
.back:hover { color: var(--orange); }
.post-cta { margin-top: 64px; padding: 32px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--panel); display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.post-cta h3 { margin: 0; }

@media (max-width: 900px) {
  .docs { grid-template-columns: 1fr; gap: 32px; padding-top: 48px; }
  .toc { position: static; flex-direction: row; flex-wrap: wrap; gap: 6px; }
  .toc .toc-label { width: 100%; }
  .toc a { border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; font-size: 13px; }
  .posts { grid-template-columns: 1fr; }
  .post-card:first-child { grid-column: auto; padding: 28px; }
  .page-head, .post { padding-top: 56px; }
}