/* ------------------------------------------------------------------
   site.css: the merged-site layout (homepage v2, footer v2, blog index,
   list rows, sidebar). Builds on the tokens in styles.css and inherits
   its light/dark theme through the CSS variables.
   ------------------------------------------------------------------ */

/* ---- Header additions ------------------------------------------- */
.nav-search {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
}
.nav-search:hover { border-color: var(--color-border-strong); color: var(--color-accent); }
.nav-list a[aria-current="page"] { color: var(--color-accent); }

/* ---- Hero v2 ------------------------------------------------------ */
.hero-v2 { padding: 5rem 0 3.5rem; }
.hero-v2-inner {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 3.5rem;
  align-items: center;
}
.hero-v2-copy { display: flex; flex-direction: column; gap: 1.4rem; }
.hero-v2-title {
  margin: 0;
  font-size: clamp(2.4rem, 5vw, 3.75rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
  font-weight: 800;
  text-wrap: balance;
}
.hero-v2-body {
  margin: 0;
  max-width: 36rem;
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}
.hero-v2 .hero-stats { margin-top: 0.5rem; }

.featured-post {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  text-decoration: none;
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, border-color 0.2s ease;
}
a.featured-post:hover { transform: translateY(-2px); border-color: var(--color-border-strong); }
.featured-post-media {
  aspect-ratio: 16 / 9;
  background: #0f172a;
  overflow: hidden;
}
.featured-post-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.featured-post-body { display: flex; flex-direction: column; gap: 0.6rem; padding: 1.5rem; }
.featured-post-meta {
  display: flex; gap: 0.6rem; align-items: center; margin: 0;
  font-size: 0.8rem; color: var(--color-text-muted);
}
.featured-post-label {
  font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--color-accent);
}
.featured-post-title { margin: 0; font-size: 1.45rem; line-height: 1.2; letter-spacing: -0.02em; }
.featured-post-excerpt { margin: 0; font-size: 0.95rem; line-height: 1.55; color: var(--color-text-muted); }
.featured-post-empty { justify-content: center; min-height: 260px; }
.featured-post-empty a { color: var(--color-accent); }

/* ---- Pills, grids, panels ---------------------------------------- */
.pill-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1.5rem 0 1.75rem; }
.pill {
  display: inline-flex; align-items: center; gap: 0.4rem;
  min-height: 36px; padding: 0 0.9rem; border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.85rem; font-weight: 500; text-decoration: none;
}
.pill:hover { border-color: var(--color-border-strong); }
.pill.is-active { background: var(--color-text); color: var(--color-bg); border-color: var(--color-text); }

.blog-grid-3 { grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr)); }

.blog-panels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr));
  gap: 1.25rem;
  margin-top: 1.25rem;
}
.blog-panel {
  display: flex; flex-direction: column; gap: 0.25rem;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.blog-panel .eyebrow { margin-bottom: 0.5rem; }
.blog-panel-link {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  min-height: 44px; padding: 0.4rem 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text); font-weight: 600; font-size: 0.98rem; text-decoration: none;
}
.blog-panel-link:last-child { border-bottom: 0; }
.blog-panel-link:hover { color: var(--color-accent); }
.blog-panel-count { font-size: 0.82rem; font-weight: 500; color: var(--color-text-muted); white-space: nowrap; }

/* ---- Labs v2 ------------------------------------------------------ */
.labs-v2-inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 3rem;
  align-items: center;
}
.labs-v2-copy { display: flex; flex-direction: column; gap: 1.1rem; }
.labs-v2-copy .labs-body { margin: 0; color: var(--color-text-muted); font-size: 1.05rem; line-height: 1.65; }
.labs-v2-copy .labs-skills { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.labs-v2-copy .labs-skill {
  padding: 0.35rem 0.75rem; border-radius: 999px;
  border: 1px solid var(--color-border); background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.82rem; font-weight: 500;
}
.labs-v2-copy .labs-actions { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }
.labs-v2-panel {
  display: flex; flex-direction: column; gap: 1.1rem;
  padding: 2rem;
  border-radius: var(--radius-xl);
  background: #0f172a;
  color: #e2e8f0;
  box-shadow: var(--shadow-soft);
}
.labs-v2-panel-eyebrow {
  margin: 0; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: #93c5fd;
}
.labs-v2-steps { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 0.8rem; font-size: 1rem; }
.labs-v2-steps li { display: flex; align-items: center; gap: 0.75rem; }
.labs-v2-dot {
  flex: none; width: 20px; height: 20px; border-radius: 999px;
  border: 2px solid #475569; box-sizing: border-box;
}
.labs-v2-dot.is-done { background: #2563eb; border-color: #2563eb; }
.labs-v2-progress { height: 6px; border-radius: 999px; background: #1e293b; overflow: hidden; }
.labs-v2-progress div { width: 66%; height: 100%; background: #3b82f6; }
.labs-v2-panel-note { margin: 0; font-size: 0.82rem; color: #94a3b8; }

/* ---- Newsletter v2 ------------------------------------------------ */
.newsletter-v2 { max-width: none; }
.newsletter-v2 .newsletter-form-inline { max-width: 36rem; }

/* ---- Footer v2 ---------------------------------------------------- */
.footer-v2 { background: #0f172a; color: #cbd5e1; padding: 4rem 0 2.5rem; }
.footer-v2-inner { display: flex; flex-direction: column; gap: 2.5rem; }
.footer-v2-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, minmax(0, 1fr));
  gap: 2rem;
}
.footer-v2-about p { margin: 0; font-size: 0.92rem; line-height: 1.6; max-width: 26rem; }
.footer-v2-brand { color: #fff; font-weight: 700; font-size: 1.05rem; margin-bottom: 0.6rem !important; }
.footer-v2-col { display: flex; flex-direction: column; gap: 0.2rem; }
.footer-v2-col h3 {
  margin: 0 0 0.5rem; font-size: 0.78rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: #fff;
}
.footer-v2-col a {
  display: flex; align-items: center; min-height: 34px;
  color: #cbd5e1; font-size: 0.92rem; text-decoration: none;
}
.footer-v2-col a:hover { color: #fff; }
.footer-v2-bottom {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.75rem 1.5rem;
  padding-top: 1.5rem; border-top: 1px solid rgba(148, 163, 184, 0.25);
  font-size: 0.8rem; color: #94a3b8;
}
.footer-v2-bottom p { margin: 0; }
.footer-v2-bottom .footer-v2-links { display: flex; flex-wrap: wrap; gap: 1rem; }
.footer-v2-bottom a { color: #cbd5e1; text-decoration: none; }
.footer-v2-bottom a:hover { color: #fff; }

/* ---- Blog index --------------------------------------------------- */
.breadcrumb { display: flex; gap: 0.5rem; font-size: 0.82rem; color: var(--color-text-muted); margin-bottom: 1rem; }
.breadcrumb a { color: var(--color-text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--color-accent); }

.blog-index { padding: 3.5rem 0 1.5rem; }
.blog-index-title { margin: 0 0 0.75rem; font-size: clamp(2.2rem, 4vw, 3rem); letter-spacing: -0.03em; line-height: 1.05; }
.blog-index-lede { margin: 0 0 1.5rem; max-width: 40rem; font-size: 1.1rem; line-height: 1.6; color: var(--color-text-muted); }

.blog-search { display: flex; flex-wrap: wrap; gap: 0.6rem; max-width: 40rem; }
.blog-search input {
  flex: 1 1 18rem; min-height: 50px; padding: 0 1rem;
  border-radius: 14px; border: 1px solid var(--color-border-strong);
  background: var(--color-surface); color: var(--color-text);
  font: inherit; font-size: 1rem;
}
.blog-search input:focus { outline: 2px solid var(--color-accent); outline-offset: 1px; }
.blog-search-status { margin: 0.75rem 0 0; font-size: 0.9rem; color: var(--color-text-muted); min-height: 1.2em; }

.blog-index-body { padding-top: 0.5rem; }
.blog-index-grid { display: flex; flex-wrap: wrap; gap: 2.5rem; align-items: flex-start; }
.blog-index-main { flex: 999 1 34rem; min-width: 0; }
.blog-index-main .pill-row { margin-top: 0; }
.blog-sidebar { flex: 1 1 17rem; min-width: 0; display: flex; flex-direction: column; gap: 1.25rem; }

.post-list { display: flex; flex-direction: column; gap: 0.75rem; margin-bottom: 1.5rem; }
.post-list[hidden] { display: none; }
.post-row {
  display: grid;
  grid-template-columns: 168px minmax(0, 1fr);
  gap: 1.25rem;
  align-items: center;
  padding: 1.1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  color: var(--color-text);
  text-decoration: none;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
a.post-row:hover { border-color: var(--color-border-strong); transform: translateY(-1px); }
.post-row-thumb { aspect-ratio: 16 / 9; border-radius: 12px; overflow: hidden; background: #0f172a; }
.post-row-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.post-row-body { display: flex; flex-direction: column; gap: 0.35rem; min-width: 0; }
.post-row-meta { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0; font-size: 0.78rem; color: var(--color-text-muted); }
.post-row-cat { color: var(--color-accent); font-weight: 600; }
.post-row h2 { margin: 0; font-size: 1.2rem; line-height: 1.25; letter-spacing: -0.015em; }
.post-row-excerpt { margin: 0; font-size: 0.9rem; line-height: 1.5; color: var(--color-text-muted); }
.post-row-empty { grid-template-columns: 1fr; }
.post-row-empty a { color: var(--color-accent); }

.sidebar-card {
  display: flex; flex-direction: column; gap: 0.3rem;
  padding: 1.4rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.sidebar-card .eyebrow { margin-bottom: 0.5rem; }
.sidebar-card p { margin: 0; font-size: 0.95rem; line-height: 1.5; }
.sidebar-link {
  display: flex; align-items: center; min-height: 40px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text); font-size: 0.92rem; font-weight: 600; text-decoration: none;
}
.sidebar-link:last-child { border-bottom: 0; }
.sidebar-link:hover { color: var(--color-accent); }
.sidebar-card-dark { background: #0f172a; color: #e2e8f0; border-color: #0f172a; gap: 0.8rem; }
.sidebar-card-dark .eyebrow { color: #93c5fd; }
.sidebar-card-dark .btn { justify-content: center; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.sidebar-links { display: flex; flex-direction: column; gap: 0.25rem; padding: 0 0.5rem; }
.sidebar-links a { display: flex; align-items: center; min-height: 36px; color: var(--color-text-muted); font-size: 0.9rem; text-decoration: none; }
.sidebar-links a:hover { color: var(--color-accent); }

/* ---- Responsive --------------------------------------------------- */
@media (max-width: 900px) {
  .hero-v2 { padding-top: 3rem; }
  .hero-v2-inner, .labs-v2-inner { grid-template-columns: 1fr; gap: 2rem; }
  .footer-v2-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-v2-about { grid-column: 1 / -1; }
}
@media (max-width: 600px) {
  .post-row { grid-template-columns: 1fr; }
  .post-row-thumb { aspect-ratio: 16 / 9; }
  .footer-v2-grid { grid-template-columns: 1fr; }
  .nav-search { display: none; }
}

/* ---- Series navigation, related posts, ad slots ------------------- */
.series-nav {
  margin: 0 0 2rem;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.series-nav-title { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.6rem; margin: 0 0 0.6rem; font-weight: 700; }
.series-nav-title .eyebrow { margin: 0; }
.series-nav-count { font-size: 0.82rem; font-weight: 500; color: var(--color-text-muted); }
.series-nav-list { margin: 0; padding-left: 1.4rem; display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.95rem; }
.series-nav-list a { color: var(--color-text); text-decoration: none; }
.series-nav-list a:hover { color: var(--color-accent); }
.series-nav-list .is-current { font-weight: 700; color: var(--color-accent); }

.related-posts { margin: 0 0 3rem; }
.related-posts .eyebrow { margin-bottom: 1rem; }

.ad-slot { margin: 2rem 0; min-height: 0; }
.ad-slot:empty { display: none; }

/* ---- Review pass: cards with thumbnails, collapsible pills, TOC/series
   details, author card, in-post newsletter, YouTube facade, mobile fixes --- */

.blog-card-media { padding-top: 0; overflow: hidden; }
.blog-card-thumb {
  display: block;
  margin: 0 -1.6rem 0.4rem;
  aspect-ratio: 16 / 9;
  background: #0f172a;
  overflow: hidden;
}
.blog-card-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.25s ease; }
.blog-card-v2:hover .blog-card-thumb img { transform: scale(1.03); }

.pill-more { cursor: pointer; font: inherit; font-size: 0.85rem; font-weight: 500; }
.pill-row-collapsible .pill-more { display: none; }
@media (max-width: 720px) {
  .pill-row-collapsible .pill:nth-child(n+8):not(.pill-more) { display: none; }
  .pill-row-collapsible .pill-more { display: inline-flex; }
  .pill-row-collapsible.is-open .pill { display: inline-flex; }
}

details.post-toc > summary, details.series-nav > summary {
  cursor: pointer; list-style: none; display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap;
}
details.post-toc > summary::-webkit-details-marker, details.series-nav > summary::-webkit-details-marker { display: none; }
details.post-toc > summary::after, details.series-nav > summary::after {
  content: ""; margin-left: auto; width: 8px; height: 8px;
  border-right: 2px solid var(--color-text-muted); border-bottom: 2px solid var(--color-text-muted);
  transform: rotate(45deg); transition: transform 0.15s ease;
}
details[open].post-toc > summary::after, details[open].series-nav > summary::after { transform: rotate(-135deg); }
details.post-toc > summary .eyebrow { margin: 0; }
details.post-toc[open] > summary { margin-bottom: 0.5rem; }
details.series-nav > summary { margin: 0; }
details.series-nav[open] > summary { margin-bottom: 0.6rem; }
.series-nav-name { font-weight: 700; }
.series-nav-list { margin-top: 0; }

.author-card {
  display: flex; gap: 1.25rem; align-items: flex-start;
  margin: 3rem 0 1.25rem; padding: 1.5rem;
  border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface);
}
.author-card-avatar { width: 72px; height: 72px; border-radius: 999px; flex: none; object-fit: cover; }
.author-card-body { display: flex; flex-direction: column; gap: 0.4rem; min-width: 0; }
.author-card-name { margin: 0; font-weight: 700; }
.author-card-bio { margin: 0; font-size: 0.95rem; line-height: 1.55; color: var(--color-text-muted); }
.author-card-links { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; margin-top: 0.25rem; font-size: 0.9rem; font-weight: 600; }
.author-card-links a { color: var(--color-accent); text-decoration: none; min-height: 32px; display: inline-flex; align-items: center; }

.newsletter-inpost { margin: 0 0 1rem; text-align: left; max-width: none; }
.newsletter-inpost-title { margin: 0.25rem 0 0.5rem; font-size: 1.35rem; letter-spacing: -0.015em; }
.newsletter-inpost .newsletter-pitch { margin: 0 0 1rem; }
.newsletter-inpost .newsletter-form-inline { max-width: 32rem; margin: 0; }

.yt-facade { position: relative; aspect-ratio: 16 / 9; background: #000; overflow: hidden; border-radius: inherit; }
.yt-facade img { width: 100%; height: 100%; object-fit: cover; display: block; opacity: 0.92; }
.yt-facade-play {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  width: 72px; height: 72px; border-radius: 999px; border: 0; cursor: pointer;
  background: #ff0000; color: #fff; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4); transition: transform 0.15s ease;
}
.yt-facade-play:hover { transform: translate(-50%, -50%) scale(1.06); }
.yt-facade-title {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 0.9rem 1rem;
  font-size: 0.85rem; font-weight: 600; color: #fff;
  background: linear-gradient(transparent, rgba(0,0,0,0.75));
}
.yt-facade iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.post-content .yt-facade { border-radius: var(--radius-lg); margin: 1.5rem 0; }
.post-content .yt-facade img { width: 100%; height: 100%; max-width: none; border: 0; border-radius: 0; margin: 0; }

.section-header-count { font-size: 0.85rem; }

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex !important; flex-direction: column; align-items: center; justify-content: center; gap: 5px; }
  .nav-toggle .nav-toggle-bar { margin: 0; }
}
@media (max-width: 720px) {
  .hero-v2 .hero-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
  .hero-v2 .hero-stat-value { font-size: 1.4rem; }
  .hero-v2 .hero-stat-label { font-size: 0.72rem; }
  .blog-search input, .blog-search .btn { flex: 1 1 100%; }
  .author-card { flex-direction: column; }
}

/* ---- Stack consistency (Oct 2026) ------------------------------------
   The logo's navy half disappears on the dark header; give it the same
   white tile Labs uses so the brand lockup is identical across the stack. */
html[data-theme="dark"] .brand-logo-dark { background: #fff; border-radius: 8px; padding: 2px; box-sizing: border-box; }

/* ---- Simple prose pages (referral links) ---------------------------- */
.prose-page { max-width: 46rem; }
.prose-page h3 { margin: 2.2rem 0 0.6rem; font-size: 1.35rem; }
.prose-page h4 { margin: 1.8rem 0 0.4rem; font-size: 1.05rem; }
.prose-page p, .prose-page li { line-height: 1.65; color: var(--color-text); }
.prose-page ul { padding-left: 1.2rem; }
.prose-page a { color: var(--color-accent); }

/* .video-frame already reserves a 16:9 box with padding-bottom; a facade inside it
   must fill that box instead of adding its own 16:9 height underneath (the "black
   space under the video" on the homepage). */
.video-frame > .yt-facade { position: absolute; inset: 0; aspect-ratio: auto; height: 100%; }

/* ---- Projects, My lab, Community ------------------------------------- */
.project-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 0.75rem; }
.pill-static { font-size: 0.72rem; padding: 0.2rem 0.6rem; cursor: default; }
.project-card h2, .project-card h3, .hw-card h3 { margin: 0 0 0.5rem; }
.project-card p, .hw-card p { line-height: 1.6; }
.project-card-featured { padding: 2rem; }
.project-links { display: flex; flex-wrap: wrap; gap: 1rem; margin: 0.75rem 0 0 !important; font-size: 0.92rem; }
.project-links a { color: var(--color-accent); text-decoration: none; font-weight: 600; }
.project-links a:hover { text-decoration: underline; }
.hw-role { margin: 0 0 0.3rem !important; font-size: 0.74rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-text-muted); }
.community-card h3 { margin: 0 0 0.5rem; }
.community-card .btn { margin-top: 0.5rem; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 760px) { .grid-2 { grid-template-columns: 1fr; } }
.ad-slot { margin: 2rem 0; min-height: 90px; }
.ad-slot-list { margin: 0.5rem 0 1rem; }