/* Blog pages: post layout, blog index and reading aids. Tokens come from style.css. */

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
}
.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--ink); }
.site-header nav a[aria-current="page"] { color: var(--ink); }

/* Reading progress, driven by blog.js */
.read-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 6;
  height: 3px;
  pointer-events: none;
}
.read-progress span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--signal));
  transform: scaleX(var(--progress, 0));
  transform-origin: 0 50%;
}

/* Blog index */
.blog-hero {
  padding-top: clamp(40px, 8vw, 96px);
  padding-bottom: clamp(32px, 5vw, 56px);
}
.blog-hero .key span:last-child { overflow-wrap: anywhere; }
.blog-title {
  max-width: 16ch;
  text-wrap: balance;
  font: 800 clamp(40px, 7.5vw, 92px)/0.98 var(--display);
  letter-spacing: -0.035em;
  font-variation-settings: "opsz" 96;
}
.blog-list { padding-top: 32px; }
.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}
.chip {
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  font: 500 13px/1.3 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s, color 0.15s;
}
.chip:hover { border-color: var(--accent); }
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.chip:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
  gap: 20px;
}
.post-card[hidden] { display: none; }
.filter-empty { color: var(--muted); }
@media (min-width: 800px) {
  .post-grid--index > .post-card--featured { grid-column: 1 / -1; }
  .post-grid--index > .post-card--featured .post-card-link {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
  .post-grid--index > .post-card--featured .post-card-cover { aspect-ratio: auto; min-height: 320px; }
}

/* Post */
.post-head {
  padding-top: clamp(32px, 6vw, 72px);
  padding-bottom: clamp(24px, 4vw, 40px);
}
.crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  font: 500 13px/1.4 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--ink); }
.crumbs span { color: var(--signal); }
.post-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  margin: 0 0 20px;
  font: 500 12px/1.4 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.post-tags a {
  padding: 4px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 12%, var(--paper));
  color: var(--ink);
  text-decoration: none;
}
.post-tags a:hover { background: color-mix(in srgb, var(--accent) 22%, var(--paper)); }
.post-title {
  max-width: 22ch;
  text-wrap: balance;
  overflow-wrap: break-word;
  font: 800 clamp(34px, 6vw, 72px)/1.02 var(--display);
  letter-spacing: -0.03em;
  font-variation-settings: "opsz" 96;
}
.post-byline {
  margin: 20px 0 0;
  font: 400 14px/1.5 var(--mono);
  color: var(--muted);
}
.post-cover { margin-block: 0 clamp(28px, 4vw, 48px); }
.post-cover img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 560px;
  object-fit: cover;
  border-radius: 16px;
  border: 1px solid var(--rule);
}

.post-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas: "answer" "toc" "prose";
  gap: 28px;
  padding-bottom: 56px;
}
@media (min-width: 1000px) {
  .post-layout {
    grid-template-columns: 220px minmax(0, 70ch);
    grid-template-areas: "toc answer" "toc prose";
    column-gap: 56px;
    align-items: start;
  }
  .toc { position: sticky; top: 96px; }
}

/* The short answer leads the post: a direct, quotable answer for readers and answer engines. */
.answer {
  grid-area: answer;
  position: relative;
  padding: 22px 24px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--accent);
}
.answer-label {
  margin: 0 0 8px;
  font: 500 12px/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--signal);
}
.answer-text {
  margin: 0;
  font-size: clamp(17px, 1.9vw, 19px);
  line-height: 1.6;
}

.toc {
  grid-area: toc;
  padding: 18px 20px;
  border: 1px solid var(--rule);
  border-radius: 14px;
  font-size: 15px;
}
@media (min-width: 1000px) {
  .toc { padding: 0 0 0 16px; border: 0; border-left: 1px solid var(--rule); border-radius: 0; }
}
.toc-title {
  margin: 0 0 10px;
  font: 500 12px/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.toc ol { margin: 0; padding: 0; list-style: none; counter-reset: toc; }
.toc li { counter-increment: toc; }
.toc a {
  display: flex;
  gap: 10px;
  padding: 5px 0;
  color: var(--muted);
  text-decoration: none;
  line-height: 1.4;
}
.toc a::before {
  content: counter(toc, decimal-leading-zero);
  flex-shrink: 0;
  font: 500 12px/1.9 var(--mono);
  color: var(--signal);
}
.toc a:hover, .toc a.is-active { color: var(--ink); }
.toc a.is-active::before { color: var(--accent); }

/* Article body */
.prose {
  grid-area: prose;
  min-width: 0;
  font-size: 18px;
  line-height: 1.75;
}
.prose > :first-child { margin-top: 0; }
.prose p, .prose ul, .prose ol, .prose blockquote, .prose pre, .prose table, .prose figure { margin: 0 0 1.2em; }
.prose h2 {
  margin: 2em 0 0.6em;
  scroll-margin-top: 96px;
  font: 700 clamp(26px, 3vw, 34px)/1.15 var(--display);
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.prose h3 {
  margin: 1.6em 0 0.5em;
  scroll-margin-top: 96px;
  font: 700 clamp(20px, 2.2vw, 24px)/1.25 var(--display);
  letter-spacing: -0.01em;
}
.prose h4 { margin: 1.4em 0 0.4em; font: 700 18px/1.3 var(--body); }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin: 0.35em 0; }
.prose li::marker { color: var(--signal); }
.prose strong { color: var(--ink); }
.prose blockquote {
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--signal);
  color: var(--muted);
  font-style: italic;
}
.prose code {
  padding: 2px 6px;
  border-radius: 5px;
  background: var(--surface);
  border: 1px solid var(--rule);
  font: 400 0.88em/1.4 var(--mono);
}
.prose pre {
  padding: 18px 20px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--rule);
  overflow-x: auto;
}
.prose pre code { padding: 0; border: 0; background: none; font-size: 15px; line-height: 1.6; }
.prose img { display: block; max-width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--rule); }
.prose table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 16px;
}
.prose th, .prose td { padding: 10px 14px; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; }
.prose th { font: 500 13px/1.4 var(--mono); text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
.prose hr { margin: 2.4em 0; border: 0; border-top: 1px solid var(--rule); }
.prose a { overflow-wrap: anywhere; }

/* FAQ */
.faq { margin-top: 2.4em; }
.faq details {
  border-top: 1px solid var(--rule);
}
.faq details:last-child { border-bottom: 1px solid var(--rule); }
.faq summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary h3 { margin: 0; font-size: clamp(18px, 2vw, 21px); }
.faq summary::after {
  content: "+";
  flex-shrink: 0;
  font: 500 24px/1 var(--mono);
  color: var(--accent);
  transition: transform 0.2s;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.faq-answer { padding: 0 0 18px; color: var(--muted); }
.faq-answer > :last-child { margin-bottom: 0; }

.post-cta { padding-bottom: 48px; }
.related .post-grid { margin-top: 4px; }

@media (prefers-reduced-motion: reduce) {
  .chip, .faq summary::after { transition: none; }
}
@media print {
  .site-header, .read-progress, .toc, .post-cta, .related, .chat-launcher { display: none; }
}