/* OD-LAYOUT-PRIMITIVES v1 — structure only: display, flex/grid, overflow, wrapping, ratio.
   Product CSS below this layer owns all visual styling. */
@layer od-layout {
  :where(.od-stack,.od-row,.od-row-top,.od-cluster,.od-grid,.od-field,.od-stat,.od-cell,.od-tile) > :where(*) { min-width: 0; }
  .od-stack { display: flex; flex-direction: column; gap: var(--od-gap, 8px); }
  .od-row { display: flex; align-items: center; gap: var(--od-gap, 8px); }
  .od-row-top { display: flex; align-items: flex-start; gap: var(--od-gap, 8px); }
  .od-cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--od-gap, 8px); }
  .od-fill { flex: 1 1 0; min-width: 0; }
  .od-fixed { flex: none; }
  .od-grid { display: grid; gap: var(--od-gap, 12px); grid-template-columns: repeat(var(--od-cols, 3), minmax(0, 1fr)); }
  .od-stat, .od-field, .od-cell { display: grid; gap: var(--od-gap, 2px); }
  :where(.od-stat,.od-field,.od-cell) > :where(*) { display: block; }
  .od-tile { display: grid; grid-template-rows: auto 1fr; }
  :where(.od-tile) > :where(*) { display: block; }
  .od-media { display: block; width: 100%; height: auto; aspect-ratio: var(--od-ratio, auto); }
  .od-media-cover { object-fit: cover; }
  .od-truncate { display: block; max-width: 100%; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
  .od-clamp-2, .od-clamp-3 { display: -webkit-box; -webkit-box-orient: vertical; overflow: hidden; overflow-wrap: anywhere; }
  .od-clamp-2 { -webkit-line-clamp: 2; }
  .od-clamp-3 { -webkit-line-clamp: 3; }
  .od-lines-2 { min-height: calc(2 * 1.4em); }
  .od-nowrap { white-space: nowrap; }
  .od-keep { word-break: keep-all; overflow-wrap: anywhere; }
  .od-screen { display: grid; grid-template-rows: auto minmax(0, 1fr) auto; height: 100%; }
  .od-scroll { overflow-y: auto; overscroll-behavior: contain; min-height: 0; }
  .od-rail { display: flex; gap: var(--od-gap, 8px); overflow-x: auto; scroll-snap-type: x proximity; scrollbar-width: none; padding-inline: var(--od-rail-pad, 16px); scroll-padding-inline: var(--od-rail-pad, 16px); }
  .od-rail::-webkit-scrollbar { display: none; }
  :where(.od-rail) > :where(*) { flex: none; scroll-snap-align: start; }
  :where(.od-rail) > :where(:last-child) { margin-inline-end: var(--od-rail-pad, 16px); }
  .od-spacer { flex: none; visibility: hidden; pointer-events: none; }
  .od-touch { min-width: 44px; min-height: 44px; }
}
/* /OD-LAYOUT-PRIMITIVES v1 */

:root {
  color-scheme: light;
  --bg: #ffffff;
  --surface: #f7f7f7;
  --surface-strong: #eef9e8;
  --fg: #303030;
  --muted: #666666;
  --border: #e5e5e5;
  --border-strong: #cfcfcf;
  --accent: #58cc02;
  --accent-soft: #dbf8c5;
  --accent-hover: #89e219;
  --accent-active: #3f8c00;
  --accent-ink: #173b00;
  --blue: #0b76a8;
  --warn: #ffc800;
  --danger: #c92f2f;
  --font-display: "Arial Rounded MT Bold", "Trebuchet MS", sans-serif;
  --font-body: "Mona Sans", "Avenir Next", "Segoe UI", sans-serif;
  --text-xs: 0.8125rem;
  --text-sm: 0.9375rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.5rem;
  --text-2xl: clamp(2rem, 4vw, 3rem);
  --text-3xl: clamp(2.75rem, 6vw, 4.75rem);
  --leading-body: 1.65;
  --leading-tight: 1.05;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  --radius-sm: 0.75rem;
  --radius-md: 1rem;
  --radius-lg: 1.25rem;
  --radius-pill: 999px;
  --shadow-raised: 0 4px 0 #d7d7d7;
  --shadow-accent: 0 4px 0 var(--accent-active);
  --focus-ring: 0 0 0 4px rgba(28, 176, 246, 0.28);
  --motion-fast: 180ms;
  --motion-base: 320ms;
  --ease-standard: cubic-bezier(0.34, 1.56, 0.64, 1);
  --container: 68rem;
  --reading: 45rem;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; }
img { height: auto; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: var(--accent-active); text-underline-offset: 0.2em; }
a:hover { color: var(--accent-ink); }
:focus-visible { outline: none; box-shadow: var(--focus-ring); border-radius: var(--radius-sm); }
.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;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: var(--space-3);
  left: var(--space-3);
  transform: translateY(-160%);
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--fg);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--fg);
  font-weight: 800;
}
.skip-link:focus { transform: translateY(0); }

.container { width: min(100% - 2rem, var(--container)); margin-inline: auto; }
.reading { width: min(100%, var(--reading)); margin-inline: auto; }
.blog-shell .reading { width: min(100% - 2rem, var(--reading)); }
.blog-shell .article-layout { width: min(100% - 2rem, var(--container)); }
.section { padding-block: var(--space-24); }
.section-compact { padding-block: var(--space-16); }
.section-tinted { background: var(--surface); border-block: 2px solid var(--border); }

.site-header {
  border-bottom: 2px solid var(--border);
  background: rgba(255, 255, 255, 0.96);
}
.nav-shell {
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--fg);
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 900;
  line-height: 1.15;
  text-decoration: none;
}
.brand-mark { width: 2.75rem; height: 2.75rem; border-radius: var(--radius-sm); }
.nav-links { display: flex; align-items: center; flex-wrap: wrap; justify-content: flex-end; gap: var(--space-2); }
.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding-inline: var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-weight: 800;
  text-decoration: none;
}
.nav-link:hover, .nav-link[aria-current="page"] { background: var(--surface); color: var(--fg); }
.github-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 2.75rem;
  padding-inline: var(--space-4);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: 0 3px 0 var(--border);
  color: var(--fg);
  font-weight: 900;
  text-decoration: none;
}
.github-link svg { width: 1.15rem; height: 1.15rem; }

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  width: fit-content;
  color: var(--accent-ink);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 900;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
.section-label::before {
  content: "";
  display: block;
  width: 2rem;
  height: 3px;
  background: var(--accent);
}
h1, h2, h3 {
  margin: 0;
  color: var(--fg);
  font-family: var(--font-display);
  font-weight: 900;
  line-height: var(--leading-tight);
  letter-spacing: -0.025em;
}
h1 { max-width: 11ch; font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); line-height: 1.2; }
p { margin: 0; }
.lede { max-width: 39rem; color: var(--muted); font-size: clamp(1.1rem, 2vw, 1.3rem); line-height: 1.6; }
.section-copy { max-width: 40rem; color: var(--muted); font-size: var(--text-lg); }
.section-heading { display: grid; gap: var(--space-4); margin-bottom: var(--space-10); }

.hero { padding-block: clamp(4rem, 8vw, 7rem); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(15rem, 0.5fr); align-items: center; gap: clamp(3rem, 8vw, 7rem); }
.hero-copy { display: grid; gap: var(--space-5); }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-6); margin-top: var(--space-2); }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 3.25rem;
  padding: 0.85rem 1.35rem;
  border: 0;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 900;
  letter-spacing: 0.035em;
  text-decoration: none;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform var(--motion-fast) var(--ease-standard), background-color var(--motion-fast) ease, box-shadow var(--motion-fast) ease;
}
.button-primary { background: var(--accent); color: var(--accent-ink); box-shadow: var(--shadow-accent); }
.button-secondary { border: 2px solid var(--border); background: var(--bg); color: var(--fg); box-shadow: 0 4px 0 var(--border); }
.button svg { width: 1.15rem; height: 1.15rem; }
.hero-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 2.75rem;
  color: var(--fg);
  font-weight: 900;
  text-decoration-thickness: 2px;
}
.studio-note {
  display: grid;
  justify-items: start;
  gap: var(--space-6);
  align-content: center;
}
.studio-note img { width: 9rem; aspect-ratio: 1; border-radius: var(--radius-lg); box-shadow: 0 5px 0 var(--border); }
.studio-note strong { display: block; font-family: var(--font-display); font-size: var(--text-lg); }
.studio-note span { display: block; max-width: 20ch; margin-top: var(--space-1); color: var(--muted); font-size: var(--text-sm); }

.product-grid { --od-cols: 1; --od-gap: 0; }
.product-card {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-6);
  min-height: 8.5rem;
  padding-block: var(--space-6);
  color: var(--fg);
  text-decoration: none;
  transition: color var(--motion-fast) ease, background-color var(--motion-fast) ease;
}
.product-card + .product-card { border-top: 2px solid var(--border); }
.product-index { display: block; color: var(--accent-active); font-family: var(--font-display); font-size: var(--text-sm); font-weight: 900; }
.product-copy { display: grid; gap: var(--space-2); }
.arrow { display: grid; width: 2.75rem; height: 2.75rem; place-items: center; border: 2px solid var(--border); border-radius: var(--radius-pill); color: var(--fg); }
.arrow svg { width: 1.1rem; height: 1.1rem; }
.product-card p { color: var(--muted); }

.writing-card {
  display: grid;
  grid-template-columns: 9rem minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-6);
  padding-block: var(--space-6);
  border-block: 2px solid var(--border);
  color: var(--fg);
  text-decoration: none;
}
.writing-card-copy { display: grid; gap: var(--space-2); }
.writing-card p { max-width: 40rem; color: var(--muted); }

.site-footer { padding-block: var(--space-10); border-top: 2px solid var(--border); }
.footer-row { display: flex; align-items: center; justify-content: space-between; gap: var(--space-6); }
.footer-copy { color: var(--muted); font-size: var(--text-sm); }
.footer-links { display: flex; flex-wrap: wrap; gap: var(--space-5); }
.footer-links a { color: var(--fg); font-weight: 800; }

.page-hero { padding-block: var(--space-16); border-bottom: 2px solid var(--border); }
.page-hero .reading { display: grid; gap: var(--space-5); }
.page-hero h1 { max-width: 14ch; font-size: clamp(2.5rem, 6vw, 4.5rem); }
.article-list { display: grid; gap: var(--space-5); }
.article-card {
  display: grid;
  grid-template-columns: 9rem minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-6);
  padding: var(--space-6);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg);
  box-shadow: var(--shadow-raised);
  color: var(--fg);
  text-decoration: none;
}
.article-date { color: var(--muted); font-size: var(--text-sm); font-weight: 800; }
.article-card-copy { display: grid; gap: var(--space-2); }
.article-card-copy p { color: var(--muted); }
.topic-strip { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-8); }
.tag {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  padding-inline: var(--space-3);
  border: 2px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--surface);
  color: var(--muted);
  font-size: var(--text-sm);
  font-weight: 800;
}

.breadcrumbs { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; margin-bottom: var(--space-8); color: var(--muted); font-size: var(--text-sm); }
.breadcrumbs a { color: var(--muted); font-weight: 800; }
.article-header { display: grid; gap: var(--space-5); }
.article-header h1 { max-width: 13ch; font-size: clamp(2.5rem, 7vw, 5rem); }
.article-deck { max-width: 44rem; color: var(--muted); font-size: clamp(1.15rem, 2vw, 1.35rem); }
.article-meta { display: flex; flex-wrap: wrap; gap: var(--space-3) var(--space-6); color: var(--muted); font-size: var(--text-sm); font-weight: 800; }
.article-body { padding-block: var(--space-16) var(--space-24); }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 15rem; align-items: start; gap: var(--space-16); }
.prose { max-width: 44rem; }
.prose > * + * { margin-top: var(--space-5); }
.prose h2 { margin-top: var(--space-12); font-size: clamp(1.75rem, 4vw, 2.5rem); scroll-margin-top: var(--space-6); }
.prose h3 { margin-top: var(--space-8); }
.prose p, .prose li { color: #434343; }
.prose ul { padding-left: var(--space-6); }
.prose li + li { margin-top: var(--space-2); }
.prose blockquote {
  margin-inline: 0;
  padding: var(--space-6);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-strong);
  box-shadow: var(--shadow-raised);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 900;
  line-height: 1.45;
}
.toc { position: sticky; top: var(--space-6); padding: var(--space-5); border: 2px solid var(--border); border-radius: var(--radius-md); background: var(--surface); }
.toc strong { display: block; margin-bottom: var(--space-3); font-family: var(--font-display); }
.toc ol, .toc ul { display: grid; gap: var(--space-2); margin: 0; padding-left: 1.15rem; }
.toc ul { list-style: decimal; }
.toc a { color: var(--muted); font-size: var(--text-sm); font-weight: 800; }
.author-card { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--space-4); align-items: center; margin-top: var(--space-12); padding: var(--space-5); border: 2px solid var(--border); border-radius: var(--radius-md); background: var(--surface); }
.author-card img { width: 4.5rem; aspect-ratio: 1; border-radius: var(--radius-md); }
.author-card strong { display: block; font-family: var(--font-display); font-size: var(--text-lg); }
.author-card p { color: var(--muted); font-size: var(--text-sm); }

@media (hover: hover) {
  .button:hover { transform: translateY(-2px); }
  .button:active { transform: translateY(4px); box-shadow: none; }
  .github-link:hover { transform: translateY(-1px); color: var(--fg); }
  .hero-link:hover { color: var(--accent-active); }
  .product-card:hover h3, .writing-card:hover h3 { color: var(--accent-active); }
  .product-card:hover .arrow, .writing-card:hover .arrow { transform: translateX(4px); border-color: var(--accent-active); color: var(--accent-active); }
  .article-card:hover { transform: translateY(-2px); border-color: var(--border-strong); box-shadow: 0 6px 0 #d7d7d7; }
}

.arrow { transition: transform var(--motion-fast) var(--ease-standard), border-color var(--motion-fast) ease, color var(--motion-fast) ease; }
.hero-copy > *, .studio-note { animation: reveal-up var(--motion-base) ease-out both; }
.hero-copy > :nth-child(2) { animation-delay: 45ms; }
.hero-copy > :nth-child(3) { animation-delay: 90ms; }
.hero-copy > :nth-child(4) { animation-delay: 135ms; }
.studio-note { animation-delay: 160ms; }

@keyframes reveal-up {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 63.99rem) {
  .section { padding-block: var(--space-16); }
  .hero-grid, .article-layout { grid-template-columns: 1fr; }
  .studio-note { grid-template-columns: auto minmax(0, 1fr); align-items: center; }
  .studio-note img { width: 7rem; }
  .toc { position: static; order: -1; }
}

@media (max-width: 47.99rem) {
  .container { width: min(100% - 1.5rem, var(--container)); }
  .nav-shell { align-items: flex-start; flex-direction: column; padding-block: var(--space-4); }
  .nav-links { width: 100%; display: grid; grid-template-columns: auto auto minmax(0, 1fr); justify-content: stretch; }
  .github-link { justify-self: end; }
  .hero { padding-block: var(--space-16); }
  .writing-card { grid-template-columns: 1fr auto; align-items: center; }
  .writing-card .article-date { grid-column: 1 / -1; }
  .article-card { grid-template-columns: 1fr; align-items: start; }
  .footer-row { align-items: flex-start; flex-direction: column; }
  .article-card .arrow { display: none; }
}

@media (max-width: 29.99rem) {
  .brand-name { max-width: 11rem; }
  .nav-link { padding-inline: var(--space-2); }
  .github-link { padding-inline: var(--space-3); }
  .hero-actions, .button-primary { width: 100%; }
  .hero-actions { align-items: flex-start; }
  .studio-note { grid-template-columns: auto minmax(0, 1fr); }
  .studio-note img { width: 5.5rem; }
  .product-card { grid-template-columns: 2rem minmax(0, 1fr) auto; gap: var(--space-4); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}