:root {
  /* Unity skybox backdrop */
  --sky-top: #b8d3ea;
  --sky-mid: #f5f3ee;
  --sky-bot: #ececea;

  /* Surfaces — white default material */
  --card-bg: #ffffff;
  --card-bg-soft: #fafaf8;
  --card-border: rgba(60, 60, 80, 0.08);
  --card-shadow: 0 1px 2px rgba(20, 20, 40, 0.04), 0 8px 24px rgba(20, 20, 40, 0.06);

  /* Light-blue semi-transparent glass — the ball-pool container */
  --glass-bg: rgba(135, 178, 215, 0.16);
  --glass-bg-hover: rgba(135, 178, 215, 0.24);
  --glass-border: rgba(135, 178, 215, 0.45);

  /* Ink */
  --ink: #1a1a2e;
  --ink-2: #4a4a5e;
  --ink-3: #8b8b9e;
  --hairline: rgba(26, 26, 46, 0.08);

  /* Accent — modalsynth red, hot interactive only */
  --accent: #e94560;
  --accent-hover: #ff6b81;
  --side-a: #e94560;
  --side-b: #5fa8ff;

  /* Type */
  --serif: 'Newsreader', 'Source Serif 4', 'Source Serif Pro', Georgia, serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', 'SF Mono', Menlo, monospace;

  /* Rhythm */
  --gap-section: clamp(56px, 8vw, 96px);
  --gap-block: clamp(20px, 2.5vw, 32px);

  /* Widths — editorial sweet spot: 60-70 chars/line at body size */
  --w-prose: 620px;
  --w-figure: 760px;
  --w-frame: 620px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background:
    linear-gradient(180deg,
      var(--sky-top) 0%,
      var(--sky-mid) 38%,
      var(--sky-mid) 62%,
      var(--sky-bot) 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* ── frame & sections ── */
main { padding: 0 24px; }
.frame { max-width: var(--w-frame); margin: 0 auto; }
.section { padding: var(--gap-section) 0; border-bottom: 1px solid var(--hairline); }
.section:last-of-type { border-bottom: none; }
.section-tight { padding: clamp(40px, 5vw, 64px) 0; border-bottom: none; }
.hero + .section-tight { padding-top: 0; }

.prose,
.hook,
.eyebrow {
  max-width: var(--w-prose);
  margin-left: auto;
  margin-right: auto;
}

/* ── nav ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: rgba(245, 243, 238, 0.78);
  backdrop-filter: saturate(150%) blur(10px);
  -webkit-backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid var(--hairline);
  font-size: 13px;
  letter-spacing: 0.02em;
}
.nav-brand { font-family: var(--mono); color: var(--ink); text-decoration: none; }
.nav-brand:hover { color: var(--accent); }
.nav-meta { color: var(--ink-3); font-family: var(--mono); font-size: 12px; }

/* ── hero ── */
.hero {
  padding-top: clamp(80px, 14vw, 160px);
  padding-bottom: var(--gap-section);
  text-align: center;
}
.hero .eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 24px;
}
.hero h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin: 0 auto 24px;
  max-width: 14ch;
}
.hero .lede {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(17px, 1.6vw, 21px);
  line-height: 1.5;
  color: var(--ink-2);
  max-width: 40ch;
  margin: 0 auto 36px;
}
.hero .byline {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-3);
  margin-top: 32px;
}
.hero .byline a { color: var(--ink-2); text-decoration: none; border-bottom: 1px solid var(--hairline); }
.hero .byline a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ── chapter rhythm: hook → figure → prose ── */
.chapter { display: flex; flex-direction: column; align-items: center; gap: var(--gap-block); }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
  text-align: center;
}
.hook {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--ink);
  text-align: center;
  max-width: 22ch;
}

.figure {
  max-width: var(--w-figure);
  width: 100%;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  box-shadow: var(--card-shadow);
  overflow: hidden;
}
.figure-still { max-width: 560px; }
.figure-mini  { max-width: 420px; }
.figure video,
.figure img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--card-bg-soft);
}
.figure-iframe iframe {
  display: block;
  width: 100%;
  height: 600px;
  border: 0;
  background: var(--card-bg-soft);
}

/* video figure with prominent play affordance */
.figure-video { position: relative; }
.figure-video video {
  display: block;
  width: 100%;
  max-height: 420px;
  height: auto;
  object-fit: contain;
  background: var(--ink);
}
.figure-video .play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  pointer-events: none;
  transition: opacity 0.25s ease;
}
.figure-video.is-playing .play-overlay { opacity: 0; }
.figure-video .play-icon {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 12px 36px rgba(15, 15, 26, 0.45);
}
.figure-video .play-icon::before {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-left: 22px solid var(--ink);
  border-top: 14px solid transparent;
  border-bottom: 14px solid transparent;
  margin-left: 6px;
}
.figure-video .play-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: white;
  background: rgba(15, 15, 26, 0.65);
  padding: 6px 12px;
  border-radius: 4px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.caption .role-meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  white-space: nowrap;
}
.caption .role-link {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease;
}
.caption .role-link:hover {
  color: var(--accent);
}

/* ──────────────────────────────────────────────────────────
   BOX SYSTEM — atomic, vertical-scroll, 1:1 with poster boxes
   ────────────────────────────────────────────────────────── */

.box {
  padding: clamp(56px, 8vw, 96px) 24px;
  border-bottom: 1px solid var(--hairline);
}
.box .frame {
  max-width: var(--w-prose);
  margin: 0 auto;
}
.box-figure .frame { max-width: var(--w-figure); }

.box .eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 12px;
}

.box-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 24px;
  max-width: 22ch;
}
.box-figure .box-title { margin-left: auto; margin-right: auto; }

.box-body {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(17px, 1.5vw, 19px);
  line-height: 1.55;
  color: var(--ink);
  letter-spacing: -0.003em;
  margin-bottom: 22px;
  max-width: var(--w-prose);
}
.box-figure .box-body { margin-left: auto; margin-right: auto; }
.box-body em { font-style: italic; color: var(--ink); }
.box-body strong { font-weight: 600; }
.box-body code {
  font-family: var(--mono);
  font-size: 0.85em;
  padding: 2px 6px;
  background: var(--card-bg-soft);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  color: var(--ink);
}

/* Dark sidenote — the poster's 【深色背景框】 */
.deep-frame {
  background: var(--ink);
  color: rgba(234, 234, 234, 0.92);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  padding: 18px 22px;
  border-radius: 10px;
  margin-top: 18px;
  max-width: var(--w-prose);
}
.box-figure .deep-frame { margin-left: auto; margin-right: auto; }
.deep-frame strong { color: white; font-weight: 600; }
.deep-frame em { color: white; font-style: italic; }
.deep-frame code {
  font-family: var(--mono);
  font-size: 0.88em;
  padding: 2px 6px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 4px;
  color: white;
}

/* Param list inside Box 5's deep-frame */
.param-list {
  margin: 12px 0 0 22px;
  padding: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(234, 234, 234, 0.85);
}
.param-list li { padding: 1px 0; }
.param-list code {
  font-family: var(--mono);
  font-size: 13px;
  padding: 1px 5px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  color: white;
}

/* Inline placeholder (used only for boxes that will get an interactive later) */
.placeholder-mini {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  background: var(--glass-bg);
  border: 1px dashed var(--glass-border);
  padding: 6px 12px;
  border-radius: 4px;
}

/* Colored inline accents — used in Box 10 to mark red/blue markers */
.marker-red  { color: var(--side-a); font-weight: 600; }
.marker-blue { color: var(--side-b); font-weight: 600; }

/* Demos grid — boxes 9–13 as image-led cards (main line, not demoted) */
.demos-band {
  padding: clamp(56px, 8vw, 96px) 24px;
  border-bottom: 1px solid var(--hairline);
}
.demos-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 22px;
  max-width: 944px;       /* same visual width as 3×296 + 2 gaps */
  margin: 0 auto;
}
/* Each card spans 2 of 6 cols. Row 1 (09, 10) sits centered with 1 empty col
   on each side; row 2 (11–13) fills the row. All five cards equal width. */
#box-09 { grid-column: 2 / span 2; }
#box-10 { grid-column: 4 / span 2; }
#box-11 { grid-column: 1 / span 2; }
#box-12 { grid-column: 3 / span 2; }
#box-13 { grid-column: 5 / span 2; }
@media (max-width: 720px) {
  .demos-grid { grid-template-columns: 1fr; }
  #box-09, #box-10, #box-11, #box-12, #box-13 { grid-column: auto; }
}

/* ─────────────────────────────────────────
   Cross-document view transitions.
   Mirror of the rule on mofei.me/style.css so the dark↔light navigation
   between the homepage and this page crossfades smoothly instead of
   jump-cutting. Browsers without support fall back to normal navigation.
   ───────────────────────────────────────── */
@view-transition {
  navigation: auto;
}

/* View transitions. The brightness lift now happens on the homepage
   BEFORE the navigation fires (.page-brighten overlay there matches
   this page's bg gradient). By the time the VT snapshot is taken,
   the homepage looks already cream/light, so VT crossfades between
   two light snapshots — and the unavoidable browser-default "white
   navigation flash" no longer registers as a flash because the
   incoming color is the same brightness. */
::view-transition-image-pair(root) {
  isolation: auto;
}
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 0.5s;
  animation-timing-function: linear;
  mix-blend-mode: plus-lighter;
}
::view-transition-old(root) {
  animation-name: page-fade-out;
}
::view-transition-new(root) {
  animation-name: page-fade-in;
}

@keyframes page-fade-out {
  to { opacity: 0; }
}
@keyframes page-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation-duration: 0.001s;
  }
}

.card-demo {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  box-shadow: var(--card-shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.card-demo .demo-figure {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--card-bg-soft);
  overflow: hidden;
}
.card-demo .demo-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.card-demo .demo-body {
  padding: 24px 28px 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.card-demo .eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0;
}
.card-demo .box-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(20px, 1.9vw, 24px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0;
  max-width: none;
}
.card-demo .box-body + .box-body,
.card-side .box-body + .box-body { margin-top: 0.65em; }
.deep-frame > p { margin: 0; }
.deep-frame > p + p { margin-top: 0.6em; }
.deep-frame .jump-link {
  display: inline-block;
  margin-left: 6px;
  padding: 2px 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.03em;
  color: rgba(234, 234, 234, 0.92);
  border: 1px solid rgba(234, 234, 234, 0.4);
  border-radius: 999px;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.deep-frame .jump-link:hover {
  background: rgba(234, 234, 234, 0.1);
  border-color: rgba(234, 234, 234, 0.7);
}
html { scroll-behavior: smooth; }
.box, .card-demo, .card-side { scroll-margin-top: 80px; }
.card-demo .box-body {
  font-family: var(--sans);
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-2);
  margin: 0;
  max-width: none;
}
.card-demo .box-body strong { color: var(--ink); }
.card-demo .figure-meta {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  background: var(--glass-bg);
  border: 1px dashed var(--glass-border);
  padding: 5px 11px;
  border-radius: 4px;
  align-self: flex-start;
  margin-top: 4px;
}

/* Integration grid — boxes 14–19 as scan-reference cards */
.integration-band {
  background: rgba(255, 255, 255, 0.35);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  padding: clamp(56px, 8vw, 96px) 24px;
}
.integration-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  max-width: var(--w-frame);
  margin: 0 auto;
}
@media (max-width: 720px) {
  .integration-grid { grid-template-columns: 1fr; }
}

.card-side {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  box-shadow: var(--card-shadow);
  padding: 26px 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card-side.card-wide { grid-column: 1 / -1; }
@media (max-width: 720px) {
  .card-side.card-wide { grid-column: auto; }
}
.card-side .eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0;
}
.card-side .box-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.2;
  letter-spacing: -0.005em;
  color: var(--ink);
  margin: 0;
  max-width: none;
}
.card-side .box-body {
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-2);
  margin: 0;
  max-width: none;
}
.card-side .box-body strong { color: var(--ink); }
.card-side .deep-frame {
  font-size: 12.5px;
  line-height: 1.5;
  padding: 12px 14px;
  margin: 0;
  max-width: none;
}
.card-side .role-link {
  margin-top: auto;
  align-self: flex-start;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s ease;
}
.card-side .role-link:hover { border-bottom-color: var(--accent); }

/* iframe sitting inside a card-side — no double border / shadow */
.card-side .card-inset-figure {
  background: var(--card-bg-soft);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  box-shadow: none;
  overflow: hidden;
  margin-top: 4px;
}
.card-side .card-inset-figure iframe { height: 540px; }
.card-side .card-inset-figure .caption {
  padding: 12px 16px;
  font-size: 11.5px;
}

/* Box 18 stack inside its card — flat, compressed */
.card-side .stack {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0;
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-2);
}
.card-side .stack .layer {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 8px 0;
  border-bottom: 1px dashed var(--hairline);
}
.card-side .stack .layer:last-child { border-bottom: none; }
.card-side .stack .layer-num {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.card-side .stack .layer-name {
  color: var(--ink);
  font-weight: 600;
  margin-bottom: 2px;
  font-family: var(--sans);
  font-size: 13px;
}
.card-side .stack .layer-detail { color: var(--ink-3); font-size: 11.5px; line-height: 1.5; }

/* Box 20 — about/contact, lighter padding */
#box-20 { padding: clamp(72px, 9vw, 120px) 24px; border-bottom: none; }

/* ──────────────────────────────────────────────────────────
   TOC — fixed left sidebar with current-box highlight
   ────────────────────────────────────────────────────────── */

.toc {
  position: fixed;
  top: 84px;
  left: 28px;
  width: 200px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  z-index: 5;
  font-family: var(--mono);
  padding: 4px 8px 8px 0;
}
.toc nav { display: flex; flex-direction: column; gap: 2px; }

.toc-label {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  font-size: 15px;
  color: var(--ink);
  letter-spacing: -0.005em;
  margin: 14px 0 4px 0;
}
.toc-label:first-child { margin-top: 0; }

.toc-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 0;
  text-decoration: none;
  color: var(--ink-3);
  font-size: 12px;
  line-height: 1.3;
  letter-spacing: 0.01em;
  transition: color 0.18s ease;
}
.toc-item:hover { color: var(--ink); }
.toc-item:hover .toc-num {
  border-color: var(--ink);
  color: var(--ink);
}

.toc-num {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1.5px solid var(--ink-3);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 600;
  color: var(--ink-3);
  background: transparent;
  flex-shrink: 0;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.toc-num.is-icon { font-size: 9px; padding-left: 1px; }

.toc-text {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toc-item.is-current { color: var(--ink); }
.toc-item.is-current .toc-num {
  background: var(--ink);
  color: white;
  border-color: var(--ink);
}

/* hide TOC on narrower viewports (would overlap content) */
@media (max-width: 1180px) {
  .toc { display: none; }
}
.figure .caption {
  padding: 14px 20px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  border-top: 1px solid var(--hairline);
  display: flex;
  justify-content: space-between;
  gap: 16px;
}
.figure .caption .role { color: var(--ink-2); }

/* glass interactive — for "try it" CTA cards */
.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  padding: 28px 32px;
  max-width: var(--w-prose);
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: background 0.18s ease, transform 0.18s ease;
}
a.glass {
  text-decoration: none;
  color: inherit;
}
a.glass:hover {
  background: var(--glass-bg-hover);
  transform: translateY(-2px);
}
.glass .cta-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
.glass .cta-title {
  font-family: var(--serif);
  font-size: clamp(22px, 2.8vw, 28px);
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.glass .cta-body { color: var(--ink-2); font-size: 15px; }
.glass .cta-arrow {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  margin-top: 4px;
}

.prose {
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink-2);
}
.prose p + p { margin-top: 1em; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose em { font-style: italic; color: var(--ink); }
.prose code {
  font-family: var(--mono);
  font-size: 0.9em;
  padding: 2px 6px;
  background: var(--card-bg-soft);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  color: var(--ink);
}

/* ── stack diagram ── */
.stack {
  max-width: var(--w-figure);
  margin: 0 auto;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  box-shadow: var(--card-shadow);
  padding: 32px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-2);
  overflow-x: auto;
}
.stack .layer {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px dashed var(--hairline);
}
.stack .layer:last-child { border-bottom: none; }
.stack .layer-num {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.06em;
}
.stack .layer-name {
  color: var(--ink);
  font-weight: 600;
  margin-bottom: 4px;
}
.stack .layer-detail { color: var(--ink-3); font-size: 12px; }

/* ── maker / footer ── */
.maker {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  max-width: var(--w-prose);
  margin: 0 auto;
}
.maker h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(28px, 4vw, 36px);
  letter-spacing: -0.01em;
  color: var(--ink);
}
.maker .links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}
.maker .links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  background: var(--card-bg);
  transition: border-color 0.18s ease, color 0.18s ease;
}
.maker .links a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

footer.colophon {
  text-align: center;
  padding: 40px 24px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
}

/* ── small ── */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .nav { padding: 12px 16px; }
  .nav-meta { display: none; }
  main { padding: 0 18px; }
  .glass { padding: 22px 22px; }
  .stack { padding: 22px; }
  .stack .layer { grid-template-columns: 60px 1fr; gap: 12px; }
}

/* ── motion ── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition: none !important; }
}

/* ── print: one-sheet (US Letter) ── */
@page { size: letter; margin: 0.5in; }
@media print {
  body {
    background: white;
    color: black;
    font-size: 10pt;
    line-height: 1.4;
  }
  .nav, footer.colophon, .glass .cta-arrow { display: none; }
  .section { padding: 12pt 0; border-bottom: 0.5pt solid #ccc; }
  .hero { padding: 0 0 12pt 0; text-align: left; }
  .hero h1 { font-size: 22pt; max-width: none; margin: 0 0 6pt; }
  .hero .lede { font-size: 12pt; max-width: none; margin: 0 0 6pt; text-align: left; }
  .hero .eyebrow { margin: 0 0 4pt; }
  .hook { font-size: 13pt; max-width: none; text-align: left; }
  .figure, .stack, .glass, .maker { page-break-inside: avoid; }
  .figure { box-shadow: none; border: 0.5pt solid #ccc; }
  .figure video { display: none; }
  .figure img { max-height: 1.6in; object-fit: cover; }
  .glass { background: #f0f5fb; backdrop-filter: none; }
  .prose { font-size: 9.5pt; }
  .chapter { gap: 8pt; align-items: stretch; }
  a { color: #000; text-decoration: none; }
}