/* ============================================================
   hoelee-blog — global design system
   Brand colors sourced from www.hoelee.com (Kadence palette).
   Priority: reading experience → SEO → brand → everything else.
   ============================================================ */

:root {
  /* Brand palette (from hoelee.com Kadence global palette) */
  --brand: #295cff;          /* primary — cobalt/royal blue */
  --brand-strong: #1c0d5a;   /* deep indigo — dark bg anchor, headings */
  --brand-soft: #0e94ff;     /* lighter cyan-blue — hover/links */
  --ink: #1a1a1a;            /* near-black text (never pure #000) */
  --paper: #ffffff;          /* near-white bg (never pure #fff for large areas) */
  --surface: #f6f8fb;        /* cool light gray — cards, code bg */
  --surface-2: #eef2f7;      /* slightly deeper gray — borders on light */
  --border: #e1ebee;         /* cool light border (palette7) */
  --muted: #57575d;          /* secondary text (palette5) */
  --faint: #636363;          /* tertiary text (palette6) */

  /* Semantic (correct/wrong in tutorials) */
  --good: #13612e;           /* green (palette11) */
  --warn: #f5a524;           /* amber (palette15) */
  --bad: #b82105;            /* red (palette13) */

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, Menlo, Monaco, monospace;
  --fs-base: 17px;
  --lh-body: 1.7;

  /* Layout */
  --measure: 70rem;          /* global container width (nav, footer, all pages) */
  --radius: 8px;

  /* Bento cards — RGB triplet of the surface colour, so the thumbnail scrim
     fades into the card in BOTH themes (a hardcoded dark blend turned muddy
     grey on the light theme: measured pill contrast 1.96:1). */
  --card-veil: 246, 248, 251;
  --pill-bg: rgba(15, 20, 28, 0.05);
  --bento-visual-opacity: 0.3;

  color-scheme: light dark;
}

/* Dark theme */
html[data-theme='dark'] {
  --brand: #6d8dff;
  --brand-soft: #60a5fa;
  --brand-strong: #c9c2ff;
  --ink: #e5e7eb;
  --paper: #111827;
  --surface: #1f2937;
  --surface-2: #263244;
  --border: #2a3345;
  --muted: #9ca3af;
  --faint: #6b7280;
  --good: #4ade80;
  --warn: #fbbf24;
  --bad: #f87171;

  --card-veil: 31, 41, 55;
  --pill-bg: rgba(15, 20, 28, 0.5);
  --bento-visual-opacity: 0.35;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- Layout ---------- */
.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2rem 1.5rem 5rem;
  overflow-wrap: break-word;
}
.wrap > * { min-width: 0; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  row-gap: 0.4rem;
  gap: 1rem;
}
.nav .brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--ink);
  text-decoration: none;
  margin-right: auto;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
/* Brand mark: the three-colour Hoelee mark, rasterised from the vector source
   with a transparent background (public/images/hoelee-mark-96.png = 96 px, so
   it stays sharp at 26 CSS px on a 3x screen). It is decorative — the name text
   next to it is the accessible label. */
.nav .brand-mark {
  width: 26px;
  height: 26px;
  display: block;
  flex: none;
}
.nav .brand .brand-name { color: var(--ink); }
.nav .brand:hover .brand-name { color: var(--brand); }
.nav .brand .dot { color: var(--brand); }
.nav .nav-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  white-space: nowrap;
}
.nav .nav-link:hover { color: var(--brand); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: var(--radius);
  padding: 0.25rem 0.6rem;
  font-size: 0.85rem;
  line-height: 1.35;
  cursor: pointer;
  font-family: var(--font-sans);
}
.theme-toggle:hover { color: var(--brand); border-color: var(--brand); }
.search-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: var(--radius);
  padding: 0.25rem 0.6rem;
  font-size: 0.95rem;
  line-height: 1.35;
  cursor: pointer;
  font-family: var(--font-sans);
  padding-inline: 0.7rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.search-toggle:hover { color: var(--brand); border-color: var(--brand); }
.search-hint { font-size: 0.85rem; margin-right: 0.35rem; }
.search-key {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--faint);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0 0.25rem;
  margin-left: 0.1rem;
}
.lang-switch {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  line-height: 1.35;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.25rem 0.55rem;
}
.lang-switch:hover { color: var(--brand); border-color: var(--brand); }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  color: var(--ink);
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 700;
  scroll-margin-top: 5rem;
}
h1 { font-size: 2rem; margin: 0 0 1rem; }
h2 { font-size: 1.4rem; margin: 2.25rem 0 0.75rem; }
h3 { font-size: 1.15rem; margin: 1.75rem 0 0.5rem; }
p { margin: 0 0 1rem; }

a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-soft); }
article a { text-decoration: underline; text-underline-offset: 2px; }

/* Raw HTML in a post body keeps its source width — a 1920px CDN <video> or a
   full-size <img> overflows the column and forces a horizontal scrollbar. Cap
   everything to the text column; `height:auto` preserves the intrinsic ratio
   (never set a fixed aspect-ratio here, clips have different shapes). */
article video,
article iframe {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin: 1.75rem 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #000;
}
article img {
  max-width: 100%;
  height: auto;
}

/* ---------- Technical Deep Dive Accordion (details/summary) ---------- */
article details.tech-deep-dive {
  margin: 1.75rem 0;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.2s ease;
}

article details.tech-deep-dive[open] {
  padding-bottom: 1.25rem;
}

article details.tech-deep-dive > summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--brand);
  user-select: none;
  outline: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

article details.tech-deep-dive > summary::-webkit-details-marker {
  display: none;
}

article details.tech-deep-dive > summary::before {
  content: '▶';
  font-size: 0.75rem;
  transition: transform 0.2s ease;
  color: var(--brand-soft);
}

article details.tech-deep-dive[open] > summary::before {
  transform: rotate(90deg);
}

article details.tech-deep-dive > summary:hover {
  color: var(--brand-soft);
}

article details.tech-deep-dive[open] > summary {
  margin-bottom: 1rem;
  border-bottom: 1px dashed var(--border);
  padding-bottom: 0.65rem;
}

time { color: var(--faint); font-size: 0.88rem; }

/* Light theme: the v2 artwork is a near-black viewport, so on a white page it reads as
   a hard-edged slab with no separation from the paper. The consultant's ruling
   (2026-10-19, option A) is a hairline + soft ambient shadow, so it reads as a
   deliberate "dark hardware display case" card. Dark theme needs neither — there the
   art merges into the page, which is the effect we want. */
html:not([data-theme='dark']) .article-banner,
html:not([data-theme='dark']) .post-list .thumb,
html:not([data-theme='dark']) .thumb {
  border-color: rgba(15, 23, 42, 0.12);
  box-shadow: 0 10px 30px -10px rgba(15, 23, 42, 0.25);
}

/* ---------- Article ---------- */
.article-banner {
  margin: 0 0 2rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  line-height: 0;
}
.article-banner img {
  width: 100%;
  height: auto;
  display: block;
}
/* Desktop: the banner is a 16:9 figure. At full column width (1070px) it stands
   602px tall — 67% of a 900px viewport, pushing the whole article below the fold.
   Capping the width (rather than cropping) keeps the art intact: 720px -> ~405px,
   which is 45% of the viewport. */
@media (min-width: 900px) {
  .article-banner { max-width: 720px; margin-left: auto; margin-right: auto; }
}
.article-head {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}
.article-head .meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0.5rem 0 1rem;
}
.article-head .meta .sep { color: var(--border); }

/* ---------- Tags & categories ---------- */
.tag {
  display: inline-block;
  padding: 0.12em 0.55em;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  margin: 0 0.35rem 0.35rem 0;
  text-decoration: none;
}
a.tag {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--brand);
}
a.tag:hover {
  border-color: var(--brand);
  background: rgba(109, 141, 255, 0.12);
  color: var(--brand-soft);
}
span.tag {
  color: var(--faint);
  background: transparent;
  border: 1px dashed var(--border);
}

/* ---------- Code ---------- */
code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--surface);
  padding: 0.15em 0.4em;
  border-radius: 5px;
}
pre {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1.1rem 1.25rem;
  border-radius: var(--radius);
  overflow-x: auto;
  line-height: 1.55;
  margin: 1.25rem 0;
  position: relative;
}
pre code {
  background: none;
  padding: 0;
  font-size: 0.88rem;
}
.code-block { position: relative; }
.copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: var(--surface-2);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.15rem 0.55rem;
  font-size: 0.75rem;
  font-family: var(--font-sans);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s;
}
.code-block:hover .copy-btn { opacity: 1; }
.copy-btn.copied { color: var(--good); border-color: var(--good); }

/* ---------- Author card ---------- */
.author-card {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin: 2.5rem 0;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.author-card .avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--brand) 25%, transparent);
  flex-shrink: 0;
  display: block;
}
.author-card .author-body { min-width: 0; }
.author-card .who { font-weight: 600; margin: 0; }
.author-card .bio { color: var(--muted); font-size: 0.9rem; margin: 0.25rem 0 0.5rem; }
.author-card .links { display: flex; gap: 0.75rem; font-size: 0.85rem; flex-wrap: wrap; }
.author-card .author-split { font-size: 0.82rem; color: var(--muted); margin: 0.6rem 0 0; }
.author-card .author-split a { color: var(--muted); }
.author-card .author-split a:hover { color: var(--brand); }

/* ---------- About ---------- */
.about-hero {
  display: flex;
  gap: 1.75rem;
  align-items: flex-start;
  margin: 0.5rem 0 2.25rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border);
}
.about-photo {
  width: 190px;
  height: 190px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  /* The headshot's own dark-blue background sits close to the page background, so a
     faint brand ring + shadow is what actually separates it from the UI. */
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--brand) 30%, transparent),
              0 10px 28px rgba(0, 0, 0, 0.35);
  object-fit: cover;
  flex-shrink: 0;
  display: block;
}
.about-hero h1 { margin-bottom: 0.6rem; }
.about-hero h1 .handle { color: var(--muted); font-weight: 500; }
.about-lede { font-size: 1.02rem; color: var(--muted); margin-bottom: 0.75rem; }
.about-links { font-size: 0.9rem; margin-bottom: 0.5rem; }
.about-open { font-size: 0.9rem; color: var(--muted); margin: 0; }

.proof-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
  margin: 1rem 0 1.25rem;
}
.proof-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 0.9rem;
}
.proof-card .n { display: block; font-size: 1.45rem; font-weight: 700; line-height: 1.15; }
.proof-card .l { display: block; font-size: 0.78rem; color: var(--muted); margin-top: 0.25rem; }

.stack-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 1rem 0 1.5rem;
}
.stack-grid h3 { font-size: 0.95rem; margin: 0 0 0.4rem; }
.stack-grid ul { margin: 0; padding-left: 1.1rem; }
.stack-grid li { font-size: 0.88rem; color: var(--muted); margin: 0.15rem 0; }

.sme-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--brand);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  margin: 1rem 0 1.5rem;
}
.sme-block p { margin: 0.4rem 0; }
.contact-split { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; margin-top: 1rem; }
.contact-split h3 { font-size: 0.95rem; margin: 0 0 0.35rem; }
.contact-split p { margin: 0.2rem 0; font-size: 0.9rem; color: var(--muted); }

/* ---------- Dual-Track Work With Me Grid ---------- */
.work-with-me-section {
  margin: 2.5rem 0 3rem;
}

.section-sub {
  font-size: 1rem;
  color: var(--muted);
  margin: -0.25rem 0 1.5rem;
}

.dual-track-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0 2rem;
}

.track-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.track-business {
  border-top: 4px solid #10b981; /* 翡翠绿：商业增长与 ROI */
}

.track-hiring {
  border-top: 4px solid #3b82f6; /* 科技蓝：架构与工程稳健 */
}

.track-badge {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.6rem;
}

.track-business .track-badge {
  color: #10b981;
}

.track-hiring .track-badge {
  color: #3b82f6;
}

.track-header h3 {
  margin: 0 0 0.6rem;
  font-size: 1.25rem;
  line-height: 1.35;
  color: var(--ink);
}

.track-header p {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.55;
  margin: 0;
}

.track-body {
  margin: 1.25rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.track-body h4 {
  font-size: 0.95rem;
  margin: 0.6rem 0 0.2rem;
  color: var(--ink);
  font-weight: 600;
}

.track-body ul, .track-body ol {
  margin: 0;
  padding-left: 1.25rem;
}

.track-body li {
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--muted);
  margin: 0.35rem 0;
}

.track-body li strong {
  color: var(--ink);
}

.proof-links {
  list-style: none !important;
  padding-left: 0 !important;
}

.proof-links li {
  margin: 0.45rem 0;
}

.proof-links a {
  color: var(--brand-soft);
  text-decoration: none;
  font-weight: 500;
}

.proof-links a:hover {
  color: var(--brand);
  text-decoration: underline;
}

.track-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

/* ---------- What I Actually Run in Production ---------- */
.stack-section {
  margin: 3rem 0;
}

.stack-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.stack-card h3 {
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
  color: var(--ink);
}

.stack-card p {
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--muted);
  margin: 0 0 0.85rem;
}

.stack-proof {
  font-size: 0.85rem;
  padding-top: 0.65rem;
  border-top: 1px dashed var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.stack-proof span {
  color: var(--muted);
  font-weight: 600;
}

.stack-proof a {
  color: var(--brand);
  text-decoration: none;
  font-weight: 600;
}

.stack-proof a:hover {
  text-decoration: underline;
}

/* ---------- Engineering Philosophy / Guardrails ---------- */
.principles-section {
  margin: 3rem 0 2rem;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.principle-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
}

.principle-item strong {
  display: block;
  font-size: 0.98rem;
  color: var(--ink);
  margin-bottom: 0.45rem;
  line-height: 1.4;
}

.principle-item p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.55;
}

/* ---------- Related posts ---------- */
.related { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}
.related-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  color: var(--ink);
  text-decoration: none;
}
/* The post's own OG share card doubles as the card image, so the art matches
   the language of the page (see the ogImage note in posts/[...slug].astro). */
.related-thumb {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 630;
  object-fit: cover;
  background: var(--border);
  border-bottom: 1px solid var(--border);
}
.related-card:hover { border-color: var(--brand); }
.related-body { padding: 0.8rem 0.9rem; display: flex; flex-direction: column; flex: 1; }
.related-badge {
  align-self: flex-start;
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--brand);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.1em 0.6em;
  margin-bottom: 0.45rem;
}
.related-card h3 {
  margin: 0 0 0.3rem;
  font-size: 0.92rem;
  /* keep card heights comparable across a row */
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.related-card time { font-size: 0.78rem; margin-top: auto; padding-top: 0.4rem; }

/* ---------- Home hero ---------- */
.hero {
  margin: 0.5rem 0 2.2rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border);
}
.hero-id { display: flex; align-items: center; gap: 1rem; margin-bottom: 0.75rem; }
.hero-photo {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 1px solid var(--border);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--brand) 30%, transparent);
  object-fit: cover;
  flex-shrink: 0;
  display: block;
}
.hero h1 { margin: 0; font-size: 1.85rem; line-height: 1.25; }
.hero-sub { font-size: 1.02rem; color: var(--muted); max-width: 62ch; margin: 0 0 0.25rem; line-height: 1.6; }

/* Tech Stack Pills */
.hero-pills {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin: 0.85rem 0 0;
}
.hero-pills-label {
  font-size: 0.78rem;
  color: var(--faint);
  font-family: var(--font-mono);
  margin-right: 0.15rem;
}
.tech-pill {
  display: inline-flex;
  align-items: center;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.18rem 0.65rem;
  text-decoration: none;
  transition: all 0.2s ease;
}
.tech-pill:hover {
  color: var(--brand);
  border-color: var(--brand);
  background: color-mix(in srgb, var(--brand) 10%, transparent);
}

/* CTA buttons & RSS note */
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
}
.btn {
  display: inline-flex;
  align-items: center;
  font-size: 0.88rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.52rem 0.95rem;
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
}
.btn:hover {
  border-color: var(--brand);
  color: var(--brand);
}
.btn-primary {
  background: var(--brand);
  color: #ffffff !important;
  border-color: var(--brand);
  font-weight: 600;
  box-shadow: 0 2px 8px color-mix(in srgb, var(--brand) 30%, transparent);
}
.btn-primary:hover {
  background: var(--brand-soft);
  border-color: var(--brand-soft);
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px color-mix(in srgb, var(--brand) 45%, transparent);
}
.hero-note { font-size: 0.82rem; color: var(--faint); margin: 0; }

/* Visual block (Banner + Lightbox + Infra Stats Grid) */
.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 0;
}
.hero-banner-card {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  margin: 0;
  border: 1px solid var(--border-color, rgba(128, 128, 128, 0.2));
  background: var(--surface);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.15);
  cursor: zoom-in;
  text-align: left;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.hero-banner-card:hover {
  border-color: color-mix(in srgb, var(--brand) 40%, var(--border));
  box-shadow: 0 14px 36px -10px rgba(0, 0, 0, 0.25);
  transform: translateY(-1px);
}
.hero-banner-img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  display: block;
  object-fit: cover;
}
.hero-banner-zoom-badge {
  position: absolute;
  bottom: 0.65rem;
  right: 0.65rem;
  z-index: 2;
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: #ffffff;
  background: rgba(15, 23, 42, 0.82);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  pointer-events: none;
  transition: background 0.2s ease, border-color 0.2s ease;
}
.hero-banner-card:hover .hero-banner-zoom-badge {
  background: var(--brand);
  border-color: rgba(255, 255, 255, 0.35);
}

/* 4-Stat Infra Grid */
.hero-infra-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}
.infra-stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.7rem 0.9rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.infra-stat-card:hover {
  border-color: color-mix(in srgb, var(--brand) 35%, var(--border));
}
.infra-stat-val {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
  letter-spacing: -0.02em;
  font-family: var(--font-mono);
}
.infra-stat-label {
  font-size: 0.76rem;
  color: var(--muted);
  margin-top: 0.2rem;
  line-height: 1.35;
}

/* Architecture Lightbox Dialog */
.arch-lightbox {
  border: none;
  border-radius: 12px;
  background: transparent;
  padding: 0;
  max-width: 94vw;
  max-height: 94vh;
  margin: auto;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
  outline: none;
}
.arch-lightbox::backdrop {
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
}
.arch-lightbox-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.arch-lightbox-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  z-index: 2;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 1.4rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}
.arch-lightbox-close:hover {
  background: var(--brand);
  transform: scale(1.05);
}
.arch-lightbox img {
  width: 100%;
  max-height: 82vh;
  object-fit: contain;
  display: block;
}
.arch-lightbox-caption {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.65rem 1rem;
  font-size: 0.82rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: var(--paper);
}
.arch-lightbox-hint {
  font-size: 0.75rem;
  color: var(--faint);
}

/* Desktop layout: >= 960px */
@media (min-width: 960px) {
  .hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto 1fr;
    grid-template-areas:
      "intro visual"
      "actions visual";
    gap: 1.5rem 2rem;
    align-items: stretch;
  }
  .hero-intro {
    grid-area: intro;
  }
  .hero-actions {
    grid-area: actions;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    gap: 0.75rem;
  }
  .hero-visual {
    grid-area: visual;
  }
}

/* Mobile & Tablet: < 960px */
@media (max-width: 959px) {
  .hero {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
  }
  .hero-banner-card {
    border-radius: 8px;
  }
  .hero-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }
}

/* Section Header with Category Shortcuts */
.section-head-with-nav {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin: 2.25rem 0 0.75rem;
}
.section-head-with-nav h2 {
  margin: 0;
}
.section-nav-pills {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}
.section-nav-pill {
  font-size: 0.76rem;
  font-family: var(--font-mono);
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  text-decoration: none;
  transition: all 0.2s ease;
}
.section-nav-pill:hover {
  color: var(--brand);
  border-color: var(--brand);
  background: color-mix(in srgb, var(--brand) 10%, transparent);
}
.section-nav-all {
  color: var(--brand);
  border-color: color-mix(in srgb, var(--brand) 30%, var(--border));
}
.section-nav-all:hover {
  background: var(--brand);
  color: #ffffff;
  border-color: var(--brand);
}

/* ---------- Featured 2x2 Cyber-Bento Grid ---------- */
.featured-bento-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.15rem;
  margin: 1rem 0 2.5rem;
}

@media (max-width: 680px) {
  .featured-bento-grid {
    grid-template-columns: 1fr;
  }
}

.bento-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.3rem;
  overflow: hidden;
  color: var(--ink);
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  isolation: isolate;
}

.bento-card:hover {
  transform: translateY(-2px);
  border-color: var(--brand);
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.4), 0 0 20px -5px rgba(109, 141, 255, 0.25);
  color: var(--ink);
}

.bento-visual {
  position: absolute;
  top: 0;
  right: 0;
  width: 65%;
  height: 140px;
  z-index: -1;
  opacity: var(--bento-visual-opacity);
  transition: opacity 0.25s ease, transform 0.35s ease;
  pointer-events: none;
}

.bento-card:hover .bento-visual {
  opacity: 0.55;
  transform: scale(1.04);
}

.bento-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: right center;
}

.bento-visual-scrim {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, var(--surface) 0%, rgba(var(--card-veil), 0.6) 45%, transparent 100%),
    linear-gradient(0deg, var(--surface) 0%, rgba(var(--card-veil), 0.4) 55%, transparent 100%);
}

.bento-content {
  display: flex;
  flex-direction: column;
  height: 100%;
  gap: 0.65rem;
}

.bento-top-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.featured-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--brand);
  background: rgba(109, 141, 255, 0.12);
  border: 1px solid rgba(109, 141, 255, 0.3);
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
}

.bento-metric-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  background: var(--pill-bg);
  border: 1px solid var(--border);
  padding: 0.15rem 0.55rem;
  border-radius: 6px;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--good);
  box-shadow: 0 0 6px var(--good);
  animation: bento-pulse 2.4s ease-in-out infinite;
}

@keyframes bento-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.55; transform: scale(0.82); }
}

@media (prefers-reduced-motion: reduce) {
  .pulse-dot { animation: none; }
}

.bento-card h3 {
  font-size: 1.08rem;
  line-height: 1.38;
  color: var(--ink);
  margin-top: 0.15rem;
}

.bento-card p {
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--muted);
  flex-grow: 1;
}

.bento-cta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--brand);
  margin-top: 0.35rem;
  transition: transform 0.15s ease;
}

.bento-card:hover .bento-cta {
  color: var(--brand-soft);
  transform: translateX(3px);
}

/* ---------- Collapsible long code blocks ---------- */
.code-block { position: relative; }
.code-block.is-collapsed pre { max-height: 420px; overflow: hidden; }
.code-block.is-collapsed::after {
  content: '';
  position: absolute;
  left: 0; right: 0;
  bottom: 2.4rem;
  height: 5rem;
  pointer-events: none;
  background: linear-gradient(to bottom, transparent, var(--paper));
}
.code-expand {
  display: block;
  width: 100%;
  margin-top: 0.35rem;
  font: inherit;
  font-size: 0.82rem;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem;
  cursor: pointer;
}
.code-expand:hover { color: var(--brand); border-color: var(--brand); }

/* ---------- Archive ---------- */
.archive-lead, .archive-meta { color: var(--muted); font-size: 0.92rem; }
.archive-meta { margin: 0 0 1rem; }

/* ---------- 404 ---------- */
.notfound-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin: 1.5rem 0 2rem;
}
.notfound-btn {
  font: inherit;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.45rem 0.9rem;
  cursor: pointer;
}
.notfound-btn:hover { border-color: var(--brand); color: var(--brand); }
.notfound-row .body { padding-block: 0.6rem; }

/* ---------- Post list ---------- */
.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}
.post-list li:last-child { border-bottom: none; }
.post-list h2 { margin: 0 0 0.3rem; font-size: 1.25rem; }
.post-list .meta { color: var(--faint); font-size: 0.85rem; margin-bottom: 0.5rem; }
.post-list .meta .sep { color: var(--border); }
.post-list .updated { color: var(--brand); font-weight: 500; }
.post-list p { color: var(--muted); margin: 0.4rem 0 0; }

/* Post list card: thumbnail (left) + text (right) on desktop */
.post-list .post-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  align-items: start;
}
.post-list .thumb {
  display: block;
  border-radius: var(--radius);
  overflow: hidden;
  line-height: 0;
  border: 1px solid var(--border);
  background: var(--surface);
}
.post-list .thumb img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 1200 / 630;
  object-fit: cover;
}

@media (min-width: 1024px) {
  .post-list .post-row {
    grid-template-columns: 400px 1fr;
    gap: 2rem;
    align-items: center;
  }
}

/* ---------- Page head (lead paragraphs on listing pages) ---------- */
.page-head h1 { margin: 0 0 0.75rem; }
.lede {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 46rem;
  margin: 0 0 1.75rem;
}
p.lede { margin-bottom: 1.75rem; }

/* ---------- Category grid ---------- */
.category-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
.category-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: var(--ink);
  height: 100%;
}
a.category-card:hover { border-color: var(--brand); }
.category-card .art {
  line-height: 0;
  border-bottom: 1px solid var(--border);
  background: #0d1220;
}
.category-card .art svg,
.category-card .art img,
.category-card .art picture {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  transition: transform 0.25s ease;
}
a.category-card:hover .art img {
  transform: scale(1.02);
}
.category-card .body {
  padding: 1.05rem 1.2rem 1.2rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.category-card h2 {
  margin: 0 0 0.45rem;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.category-card h2 .dot {
  width: 0.5em;
  height: 0.5em;
  border-radius: 50%;
  flex-shrink: 0;
}
.category-card p {
  color: var(--muted);
  margin: 0 0 0.75rem;
  font-size: 0.93rem;
  line-height: 1.6;
}
.category-card .count {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--faint);
}
.category-card .count .n { color: var(--brand); font-weight: 600; }
.category-card.is-empty { opacity: 0.82; }
.category-card.is-empty .count { color: var(--warn); }
.category-card.is-empty .count .n { color: var(--warn); }

@media (min-width: 640px) {
  .category-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .category-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- Category detail hero art ---------- */
.cat-art-wrap {
  margin: 1.1rem 0 0 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  line-height: 0;
  background: #0d1220;
}
.cat-art-wrap svg,
.cat-art-wrap img,
.cat-art-wrap picture {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}
.cat-count {
  margin: 1.25rem 0 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--faint);
}

/* ---------- Callouts (correct / wrong in tutorials) ---------- */
.callout {
  border-left: 3px solid var(--brand);
  background: var(--surface);
  padding: 0.75rem 1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.25rem 0;
}
.callout.good { border-left-color: var(--good); }
.callout.warn { border-left-color: var(--warn); }
.callout.bad { border-left-color: var(--bad); }

/* ---------- Footer ---------- */
.site-footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--faint);
  font-size: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  justify-content: space-between;
}
.site-footer span:last-child {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
}
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--brand); }

/* ---------- Utility ---------- */
.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;
}

/* ---------- Mobile ---------- */
@media (max-width: 600px) {
  .wrap { padding: 1.5rem 1.25rem 4rem; }
  /* Two-row header: brand + search/lang/theme on row 1, the four section links
     on row 2. Without the grouped list the links wrapped one at a time and
     pushed the right-hand controls past the viewport edge at 320–390 px. */
  .nav { padding: 0.7rem 1.25rem; gap: 0.55rem 0.7rem; }
  .nav .brand { order: 1; font-size: 0.95rem; gap: 0.45rem; }
  .nav .brand-mark { width: 22px; height: 22px; }
  .search-toggle, .lang-switch, .theme-toggle { order: 2; }
  .search-toggle { padding-inline: 0.55rem; }
  .lang-switch { padding: 0.25rem 0.45rem; }
  .theme-toggle { padding: 0.25rem 0.5rem; }
  .nav-links { order: 3; flex: 0 0 100%; gap: 0.9rem; flex-wrap: wrap; row-gap: 0.35rem; }
  h1 { font-size: 1.7rem; }
  h2 { font-size: 1.25rem; }
  /* Related grid: one full-width card per row on phones, first four only. */
  .related-grid { grid-template-columns: 1fr; gap: 0.85rem; }
  .related-extra { display: none; }
  .featured-bento-grid { grid-template-columns: 1fr; }
  .proof-grid { grid-template-columns: repeat(2, 1fr); }
  .stack-grid, .contact-split { grid-template-columns: 1fr; }
  .about-hero { flex-direction: column; gap: 1rem; }
  .about-photo { width: 140px; height: 140px; }
  .dual-track-grid { grid-template-columns: 1fr; }
  .track-cta { flex-direction: column; }
  .track-cta .btn { width: 100%; justify-content: center; }
  .search-hint, .search-key { display: none; }
  .author-card { flex-direction: column; align-items: flex-start; }
}

/* ---------- Creative Lab Strip (GPU & Multimodal Lab) ---------- */
.creative-lab-strip {
  margin-top: 3.5rem;
  padding: 1.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.lab-strip-header {
  margin-bottom: 1.5rem;
}
.lab-strip-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.4rem;
}
.lab-strip-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: #ff7ab6;
  background: rgba(255, 122, 182, 0.12);
  border: 1px solid rgba(255, 122, 182, 0.3);
  border-radius: 9999px;
  padding: 0.15rem 0.6rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.lab-strip-header h2 {
  margin: 0;
  font-size: 1.35rem;
}
.lab-strip-sub {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0;
  max-width: 46rem;
  line-height: 1.5;
}
.lab-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}
.lab-card {
  display: flex;
  flex-direction: column;
  background: var(--surface-subtle, rgba(255, 255, 255, 0.02));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.lab-card:hover {
  transform: translateY(-2px);
  border-color: var(--brand);
}
.lab-card-thumb {
  width: 100%;
  aspect-ratio: 1200 / 630;
  overflow: hidden;
  background: var(--surface);
  line-height: 0;
}
.lab-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.lab-card-body {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.lab-card-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--faint);
  margin-bottom: 0.4rem;
}
.lab-card-body h3 {
  font-size: 1rem;
  line-height: 1.35;
  margin: 0 0 0.5rem;
  color: var(--ink);
}
.lab-card-body p {
  font-size: 0.85rem;
  line-height: 1.45;
  color: var(--muted);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
@media (max-width: 768px) {
  .lab-cards-grid {
    grid-template-columns: 1fr;
  }
}