/* Knowledge hub (/blogs/). Loads after assets/site/home.css and reuses its tokens, nav, buttons and footer.
   Editorial index on warm paper (Frame & Field row index), one ink newsletter slab, Arabic in RTL. */

[dir="rtl"] {
  --serif: "Noto Naskh Arabic", "Instrument Serif", Georgia, serif;
  --sans: "IBM Plex Sans Arabic", "Inter Tight", system-ui, sans-serif;
}
[dir="rtl"] .display, [dir="rtl"] .article-title, [dir="rtl"] .lead-title, [dir="rtl"] .entry-title { letter-spacing: 0; line-height: 1.3; }
[dir="rtl"] .display { font-size: clamp(2.2rem, 5vw, 3.75rem); }
.hub [lang="en"] { font-family: "Inter Tight", system-ui, sans-serif; }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

.hub-lang { display: inline-flex; gap: 2px; margin-inline-start: 8px; padding: 3px; border: 1px solid var(--hairline-strong); border-radius: 10px; }
.hub-lang a { padding: 6px 10px; border-radius: 7px; font-size: 0.875rem; font-weight: 600; color: var(--muted); text-decoration: none; }
.hub-lang a[aria-current] { background: var(--ink); color: var(--paper); }
@media (max-width: 1080px) {
  .hub-lang { margin: 20px 0 0; align-self: flex-start; }
  .hub-lang a { padding: 10px 16px; font-family: var(--sans); font-size: 1rem; }
}

/* ---------- Index page ---------- */
.hub-head { padding-top: 88px; }
.hub-title { max-width: none; }
.hub-search { display: flex; gap: 10px; max-width: 620px; margin-top: 32px; }
.hub-search input {
  flex: 1; min-width: 0; padding: 14px 16px; border: 1px solid var(--hairline-strong); border-radius: var(--radius);
  background: var(--surface); color: var(--ink); font: 400 1rem/1.3 var(--sans);
}
.hub-search input:focus { outline: none; border-color: var(--crimson); box-shadow: 0 0 0 3px rgba(163, 32, 47, 0.12); }
.hub-cats { display: flex; flex-wrap: wrap; gap: 6px 22px; margin-top: 28px; }
.hub-cats a { padding: 6px 0; color: var(--muted); text-decoration: none; border-bottom: 1.5px solid transparent; font-weight: 500; }
.hub-cats a span { color: var(--faint); font-size: 0.8125rem; }
.hub-cats a:hover { color: var(--ink); }
.hub-cats a[aria-current] { color: var(--ink); border-bottom-color: var(--crimson); }
.hub-filter { margin-top: 20px; color: var(--ink-2); }
.hub-filter span { color: var(--faint); }
.hub-filter a { margin-inline-start: 12px; color: var(--crimson); }
.hub-note { margin-top: 24px; padding: 16px 18px; border-radius: var(--radius); background: var(--crimson-soft); color: #8a1a27; }
.hub-note a { color: inherit; font-weight: 600; }

.hub-list { padding-top: 48px; }
.lead-post {
  display: grid; gap: 14px; padding: clamp(28px, 4vw, 48px); border-radius: var(--radius-lg);
  background: var(--stage); color: var(--stage-text); text-decoration: none;
  transition: transform 300ms var(--ease-press);
}
.lead-post:hover { transform: translateY(-2px); }
.lead-post .entry-meta { color: var(--rose); }
.lead-title { font-family: var(--serif); font-weight: 400; font-size: clamp(2rem, 4.4vw, 3.4rem); line-height: 1.04; letter-spacing: -0.015em; max-width: 24ch; }
.lead-excerpt { max-width: 64ch; color: var(--stage-muted); font-size: 1.0625rem; }
.lead-by { font-size: 0.9375rem; color: var(--stage-text); }

.index { margin-top: 40px; border-top: 1px solid var(--ink); }
.entry {
  display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 7fr); gap: 4px 32px; align-items: baseline;
  padding: 24px 0; border-bottom: 1px solid var(--hairline-strong); text-decoration: none;
}
.entry-meta { font-size: 0.875rem; font-weight: 500; color: var(--muted); }
.entry-title { font-family: var(--serif); font-weight: 400; font-size: clamp(1.5rem, 2.6vw, 2rem); line-height: 1.12; transition: color 180ms; }
.entry-excerpt { grid-column: 2; color: var(--muted); font-size: 0.9375rem; max-width: 70ch; }
.entry:hover .entry-title { color: var(--crimson); }
.hub-list .index:first-child { margin-top: 0; }
@media (max-width: 720px) {
  .entry { grid-template-columns: 1fr; gap: 6px; padding: 20px 0; }
  .entry-excerpt { grid-column: auto; }
}
.hub-tags { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 36px; }
.hub-tags a { color: var(--muted); font-size: 0.9375rem; text-decoration: none; }
.hub-tags a:hover { color: var(--crimson); }
.hub-empty { padding: 40px 0; border-top: 1px solid var(--ink); }
.hub-empty h2 { font-family: var(--serif); font-weight: 400; font-size: 2rem; }
.hub-empty p { margin-top: 8px; color: var(--muted); }

.hub-expert { margin-top: 104px; }
.hub-expert .btn { margin-top: 28px; }

/* ---------- Newsletter slab ---------- */
.hub-news {
  padding: clamp(32px, 5vw, 64px); border-radius: var(--radius-lg); background: var(--stage); color: var(--stage-text);
}
.hub-news .display--light em { color: var(--rose); }
.hub-news-form { display: flex; gap: 10px; max-width: 540px; margin-top: 28px; }
.hub-news-form input {
  flex: 1; min-width: 0; padding: 14px 16px; border-radius: var(--radius); border: 1px solid var(--stage-line);
  background: var(--stage-2); color: var(--stage-text); font: 400 1rem/1.3 var(--sans);
}
.hub-news-form input::placeholder { color: var(--stage-muted); }
.hub-news-form input:focus { outline: none; border-color: var(--rose); }
.hub-news-note { margin-top: 16px; font-size: 0.9375rem; }
.hub-news-note.is-ok { color: #b9e3c4; }
.hub-news-note.is-error { color: var(--rose); }
@media (max-width: 520px) {
  .hub-search, .hub-news-form { flex-direction: column; }
  .hub-search .btn, .hub-news-form .btn { width: 100%; }
}

/* ---------- Article ---------- */
.article { max-width: 820px; padding-top: 64px; }
.back { display: inline-block; color: var(--muted); text-decoration: none; font-weight: 500; }
.back:hover { color: var(--crimson); }
.article-meta { display: flex; flex-wrap: wrap; gap: 4px 18px; margin-top: 32px; color: var(--muted); font-size: 0.9375rem; }
.article-meta a { color: var(--crimson); font-weight: 600; text-decoration: none; }
.article-title { margin-top: 14px; font-family: var(--serif); font-weight: 400; font-size: clamp(2.4rem, 5.6vw, 4.25rem); line-height: 1.02; letter-spacing: -0.02em; text-wrap: balance; }
.article-author { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 14px; margin-top: 22px; padding-bottom: 28px; border-bottom: 1px solid var(--ink); font-weight: 600; }
.verified { padding: 3px 9px; border-radius: 999px; background: var(--crimson-soft); color: var(--crimson); font-size: 0.8125rem; font-weight: 600; }
.author-role { color: var(--muted); font-weight: 400; }

.prose { margin-top: 36px; font-size: 1.125rem; line-height: 1.75; color: var(--ink); }
.prose > br { display: none; }
.prose p { margin: 0 0 1.1em; max-width: 68ch; }
.prose h1, .prose h2, .prose h3, .prose h4 { font-family: var(--serif); font-weight: 400; line-height: 1.15; letter-spacing: -0.01em; }
.prose h1, .prose h2 { margin: 1.8em 0 0.5em; font-size: clamp(1.75rem, 3.4vw, 2.375rem); }
.prose h3 { margin: 1.5em 0 0.4em; font-size: 1.6rem; }
.prose h4, .prose h5, .prose h6 { margin: 1.3em 0 0.3em; font-size: 1.25rem; font-family: var(--sans); font-weight: 600; }
.prose ul { margin: 0 0 1.2em; padding-inline-start: 1.3em; list-style: disc; }
.prose ul li { margin: 0.35em 0; padding-inline-start: 0.2em; }
.prose ul li::marker { color: var(--crimson); }
.prose a { color: var(--crimson); text-underline-offset: 3px; }
.prose strong { font-weight: 600; }
.prose blockquote { margin: 1.5em 0; padding: 4px 0; padding-inline-start: 22px; border-inline-start: 3px solid var(--crimson); color: var(--ink-2); font-family: var(--serif); font-size: 1.375rem; line-height: 1.4; }
.prose blockquote p { margin: 0.4em 0; }
.prose hr { margin: 2.4em 0; border: 0; border-top: 1px solid var(--hairline-strong); }
.prose code { padding: 2px 6px; border-radius: 6px; background: var(--sunken); font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 0.875em; }
.prose .code-block { margin: 1.5em 0; overflow: hidden; border-radius: var(--radius); background: var(--stage); direction: ltr; text-align: left; }
.prose .code-header { padding: 10px 16px; border-bottom: 1px solid var(--stage-line); color: var(--stage-muted); font-size: 0.8125rem; font-weight: 600; }
.prose pre { margin: 0; padding: 18px; overflow-x: auto; color: var(--stage-text); font-size: 0.875rem; line-height: 1.6; }
.prose pre code { padding: 0; background: none; font-size: inherit; }
.prose input[type="checkbox"] { accent-color: var(--crimson); }
.prose .diagram-container { margin: 1.8em 0; padding: 24px; border: 1px solid var(--hairline); border-radius: var(--radius); background: var(--surface); }
.prose .diagram-title { font-family: var(--serif); font-size: 1.5rem; margin-bottom: 16px; }
.prose .diagram-steps { display: grid; gap: 6px; }
.prose .diagram-step { padding: 14px 16px; border-radius: 10px; background: var(--paper); border: 1px solid var(--hairline); }
.prose .step-header { display: flex; align-items: baseline; gap: 10px; font-weight: 600; }
.prose .step-number { font-family: var(--serif); font-style: italic; color: var(--crimson); font-size: 1.4rem; }
.prose .step-descriptions { margin-top: 6px; color: var(--muted); font-size: 0.9375rem; }
.prose .diagram-arrow { text-align: center; color: var(--faint); }
.prose .diagram-line { padding: 4px 0; color: var(--ink-2); }

.article-tags { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-top: 36px; }
.article-tags a { color: var(--muted); font-size: 0.9375rem; text-decoration: none; }
.article-tags a:hover { color: var(--crimson); }
.article-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 18px 28px; margin-top: 32px; padding-top: 28px; border-top: 1px solid var(--hairline-strong); }
.share { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 16px; color: var(--muted); font-size: 0.9375rem; }
.share a { color: var(--ink); font-weight: 600; text-decoration: none; border-bottom: 1px solid var(--hairline-strong); }
.share a:hover { color: var(--crimson); border-color: currentColor; }
@media (max-width: 640px) {
  .article { padding-top: 40px; }
  .prose { font-size: 1.0625rem; }
  .article-actions .btn { width: 100%; }
}