/* =========================================================
   Xavier Chen — Interview Deck 2026
   Editorial / post-Swiss style for landscape senior designer
   ========================================================= */

/* ---------- Self-hosted fonts (offline-safe) ---------- */
@font-face {
  font-family: 'Playfair Display';
  font-weight: 400;
  font-display: swap;
  src: url('../assets/fonts/playfair-400.woff2') format('woff2');
}
@font-face {
  font-family: 'Playfair Display';
  font-weight: 500;
  font-display: swap;
  src: url('../assets/fonts/playfair-500.woff2') format('woff2');
}
@font-face {
  font-family: 'Playfair Display';
  font-weight: 700;
  font-display: swap;
  src: url('../assets/fonts/playfair-700.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-weight: 400;
  font-display: swap;
  src: url('../assets/fonts/inter-400.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-weight: 500;
  font-display: swap;
  src: url('../assets/fonts/inter-500.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-weight: 700;
  font-display: swap;
  src: url('../assets/fonts/inter-700.woff2') format('woff2');
}

/* ---------- Design tokens ---------- */
:root {
  /* Type — original Playfair + Inter (no italic anywhere) */
  --font-serif:  "Playfair Display", "PingFang TC", "Noto Serif TC", "Songti TC", serif;
  --font-italic: "Playfair Display", "PingFang TC", "Noto Serif TC", serif;
  --font-sans:   "Inter", "PingFang TC", "Helvetica Neue", "Noto Sans TC", system-ui, sans-serif;

  /* Color (warm monochrome) */
  --bg:         #FAFAF7;
  --ink:        #0A0A0A;
  --ink-soft:   #2A2A28;
  --grid:       #E5E2DA;
  --grid-soft:  #F0EEE8;
  --muted:      #8A8A85;
  --accent:     #0A0A0A;

  /* Chapter accents — 70% saturation */
  --accent-red:   hsl(2, 70%, 48%);    /* AI / Cover */
  --accent-green: hsl(145, 65%, 32%);  /* Design */
  --accent-blue:  hsl(212, 65%, 46%);  /* Tools */

  /* Layout */
  --margin-x:   clamp(32px, 5vw, 80px);
  --margin-y:   clamp(28px, 4vh, 56px);
  --col-gap:    24px;
  --grid-cols:  12;

  /* Type scale (fluid) */
  --display:    clamp(56px, 8.4vw, 120px);
  --h1:         clamp(44px, 6vw, 84px);
  --h2:         clamp(28px, 3.6vw, 48px);
  --h3:         clamp(20px, 2.2vw, 28px);
  --body:       clamp(14px, 1.1vw, 16px);
  --caption:    clamp(10px, 0.85vw, 12px);

  /* Motion */
  --ease-out:   cubic-bezier(0.22, 1, 0.36, 1);
  --dur-page:   600ms;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--body);
  line-height: 1.5;
  color: var(--ink);
  background: var(--bg);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4, p, dl, dd, ul, ol, figure { margin: 0; padding: 0; }

/* ---------- Header (top bar with breadcrumb) ---------- */
.deck-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  padding: 18px var(--margin-x);
  font-family: var(--font-sans);
  font-size: var(--caption);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  pointer-events: none;
}
.deck-header > * { pointer-events: auto; }
.brand {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
  color: var(--ink);
}
.breadcrumb {
  justify-self: center;
  display: flex;
  gap: 12px;
  align-items: center;
  color: var(--muted);
}
.breadcrumb .separator { opacity: 0.5; }
.counter {
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

/* ---------- Deck (page container) ---------- */
.deck {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}
.page {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  padding: calc(var(--margin-y) + 32px) var(--margin-x) calc(var(--margin-y) + 56px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--dur-page) var(--ease-out),
              transform var(--dur-page) var(--ease-out),
              visibility 0s linear var(--dur-page);
  background: var(--bg);
}
.page.is-active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity var(--dur-page) var(--ease-out),
              transform var(--dur-page) var(--ease-out),
              visibility 0s;
}

/* Optional grid overlay (toggle .show-grid on body for debug) */
body.show-grid .page::before {
  content: "";
  position: absolute;
  inset: var(--margin-y) var(--margin-x);
  pointer-events: none;
  background-image: repeating-linear-gradient(
    to right,
    var(--grid) 0 1px,
    transparent 1px calc((100% / 12)));
  opacity: 0.5;
}

/* ---------- Bottom nav ---------- */
.deck-nav {
  position: fixed;
  bottom: 24px;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  justify-content: space-between;
  padding: 0 var(--margin-x);
  pointer-events: none;
}
.nav-cluster {
  display: flex;
  gap: 18px;
  align-items: center;
  pointer-events: auto;
}
.nav-btn {
  font-family: var(--font-sans);
  font-size: var(--caption);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 10px 14px;
  border: 1px solid transparent;
  transition: color 200ms, border-color 200ms;
}
.nav-btn::before { content: "("; opacity: 0.6; margin-right: 4px; }
.nav-btn::after  { content: ")"; opacity: 0.6; margin-left: 4px; }
.nav-btn:hover, .nav-btn:focus-visible { color: var(--ink); }
.nav-btn:disabled { opacity: 0.25; cursor: not-allowed; }

/* ---------- Common type ---------- */
.serif { font-family: var(--font-serif); }
.sans  { font-family: var(--font-sans); }
.eyebrow {
  font-family: var(--font-sans);
  font-size: var(--caption);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}
.lede {
  font-family: var(--font-serif);
  font-size: var(--h3);
  line-height: 1.45;
  color: var(--ink-soft);
  max-width: 56ch;
}

/* Editorial big title with italic accents */
.editorial-title {
  font-family: var(--font-serif);
  font-size: var(--display);
  line-height: 0.92;
  letter-spacing: -0.02em;
  font-weight: 500;
  color: var(--ink);
}
.editorial-title em {
  font-style: normal;
  font-weight: 400;
}

/* ---------- Page 01: Cover ---------- */
.page--cover {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: 1fr;
  gap: var(--col-gap);
  align-items: stretch;
  padding-top: calc(var(--margin-y) + 56px);
  padding-bottom: calc(var(--margin-y) + 80px);
}
.cover-title {
  grid-column: 1 / span 8;
  align-self: center;
  font-family: var(--font-serif);
  font-size: clamp(44px, 7vw, 100px);
  line-height: 1.02;
  letter-spacing: -0.025em;
  font-weight: 500;
}
.cover-title em {
  font-style: normal;
  font-weight: 500;
}
/* Legacy portrait — kept for fallback if you want to revert */
.cover-portrait {
  display: none;
}

/* New: flat orbs that drift across the cover and invert overlapping text */
.cover-graphic {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 5;          /* float above title so blend-mode applies */
  overflow: visible;
}
.orb {
  position: absolute;
  border-radius: 50%;
  display: block;
  background-color: #0a0a0a;
  /* Invert what's behind the orb — black text becomes white over the disc */
  backdrop-filter: invert(100%);
  -webkit-backdrop-filter: invert(100%);
}
@supports ((backdrop-filter: invert(1)) or (-webkit-backdrop-filter: invert(1))) {
  .orb { background-color: transparent; }
}
.orb--lg {
  width: clamp(240px, 28vw, 380px);
  aspect-ratio: 1 / 1;
  top: 8%;
  right: 32%;
  animation: float-lg 22s ease-in-out infinite alternate;
}
.orb--sm {
  width: clamp(64px, 8vw, 110px);
  aspect-ratio: 1 / 1;
  bottom: 12%;
  right: 8%;
  animation: float-sm 17s ease-in-out infinite alternate;
}
@keyframes float-lg {
  0%   { transform: translate(0, 0); }
  33%  { transform: translate(-200px, 80px); }
  66%  { transform: translate(-90px, 220px); }
  100% { transform: translate(-280px, 120px); }
}
@keyframes float-sm {
  0%   { transform: translate(0, 0); }
  50%  { transform: translate(-160px, -200px); }
  100% { transform: translate(-40px, -260px); }
}
@media (prefers-reduced-motion: reduce) {
  .orb { animation: none; }
}

.cover-caption {
  position: absolute;
  bottom: calc(var(--margin-y) + 80px);
  right: var(--margin-x);
  text-align: right;
  font-family: var(--font-sans);
  font-size: var(--caption);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
  line-height: 1.8;
}
.cover-caption .muted {
  color: var(--muted);
  text-transform: none;
  letter-spacing: 0.04em;
  font-size: 11px;
}
.cover-meta {
  position: absolute;
  bottom: calc(var(--margin-y) + 80px);
  left: var(--margin-x);
  font-size: var(--caption);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  line-height: 1.8;
}
.cover-rule {
  position: absolute;
  top: 18%;
  left: var(--margin-x);
  width: 18vw;
  max-width: 240px;
  height: 1px;
  background: var(--ink);
}

/* ---------- Page 02: Hub ---------- */
.page--hub {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--col-gap);
  align-content: center;
  padding-top: calc(var(--margin-y) + 80px);
}
.hub-title {
  grid-column: 1 / span 12;
  font-family: var(--font-serif);
  font-size: var(--h1);
  line-height: 0.95;
  letter-spacing: -0.02em;
  font-weight: 500;
  margin-bottom: 64px;
}
.hub-title em { font-style: normal; font-weight: 400; }
.hub-cards {
  grid-column: 1 / span 12;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--ink);
}
.hub-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 32px 28px 28px;
  border-right: 1px solid var(--grid);
  min-height: 280px;
  transition: background 280ms;
  cursor: pointer;
}
.hub-card:last-child { border-right: none; }
.hub-card:hover { background: var(--grid-soft); }
.hub-card .card-no {
  font-family: var(--font-sans);
  font-size: var(--caption);
  letter-spacing: 0.18em;
  color: var(--muted);
}
.hub-card .card-title {
  font-family: var(--font-serif);
  font-size: var(--h2);
  line-height: 1;
  letter-spacing: -0.01em;
  font-weight: 500;
  margin: 24px 0 12px;
}
.hub-card .card-title em { font-style: normal; font-weight: 400; }
.hub-card .card-desc {
  color: var(--ink-soft);
  font-size: var(--body);
  line-height: 1.55;
  max-width: 28ch;
}
.hub-card .card-cn {
  display: block;
  color: var(--muted);
  margin-top: 4px;
  font-size: 13px;
}
.hub-card .card-weight {
  font-family: var(--font-sans);
  font-size: var(--caption);
  letter-spacing: 0.2em;
  color: var(--ink);
  margin-top: 24px;
}

/* ---------- Generic page-title block ---------- */
.page--title {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--col-gap);
  align-content: center;
  padding-top: calc(var(--margin-y) + 64px);
  padding-bottom: calc(var(--margin-y) + 80px);
}
.page--title .editorial-title {
  grid-column: 1 / span 9;
}
.page--title .lede {
  grid-column: 7 / span 5;
  margin-top: 24px;
}
.page--title .eyebrow {
  grid-column: 1 / span 12;
  margin-bottom: 16px;
}

/* ---------- Case study pages ---------- */
.page--case {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: auto 1fr;
  gap: var(--col-gap);
  row-gap: 32px;
}
.case-header {
  grid-column: 1 / span 5;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.case-no {
  font-family: var(--font-sans);
  font-size: var(--caption);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}
.case-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3.6vw, 48px);
  line-height: 1.05;
  font-weight: 500;
  letter-spacing: -0.01em;
}
.case-title em {
  display: block;
  font-style: normal;
  font-weight: 400;
  font-size: 0.55em;
  color: var(--muted);
  margin-top: 10px;
  letter-spacing: 0.01em;
}
.case-meta {
  display: grid;
  grid-template-columns: 80px 1fr;
  row-gap: 6px;
  column-gap: 16px;
  font-size: var(--caption);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-top: 1px solid var(--grid);
  padding-top: 16px;
  margin-top: 8px;
}
.case-meta dt { color: var(--muted); }
.case-meta dd { color: var(--ink); }
.case-narrative {
  grid-column: 1 / span 5;
  align-self: start;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 42ch;
  font-weight: 400;
}
.case-hero {
  grid-column: 6 / span 7;
  grid-row: 1 / span 2;
  position: relative;
  overflow: hidden;
}
.case-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.02);
}
.case-thumbs {
  grid-column: 6 / span 7;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  align-self: end;
}
.case-thumbs img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

/* ---------- Software matrix (Page 07) ---------- */
.matrix {
  display: grid;
  grid-template-columns: 80px 1fr 100px 1fr 1fr;
  gap: 0;
  width: 100%;
  font-size: 14px;
  border-top: 1px solid var(--ink);
}
.matrix-row {
  display: contents;
}
.matrix-row > * {
  padding: 14px 12px;
  border-bottom: 1px solid var(--grid);
}
.matrix-head > * {
  font-family: var(--font-sans);
  font-size: var(--caption);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--ink);
}
.matrix-row .name {
  font-family: var(--font-serif);
  font-size: 18px;
  letter-spacing: -0.01em;
}
.matrix-row .years {
  color: var(--ink-soft);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.matrix-row .role {
  color: var(--ink-soft);
}
.matrix-row .signal {
  color: var(--muted);
  font-style: normal;
}

/* ---------- Workflow grid (Page 10) ---------- */
.workflow {
  display: grid;
  grid-template-columns: 180px repeat(10, 1fr);
  gap: 0;
  border-top: 1px solid var(--ink);
  font-size: 11px;
  letter-spacing: 0.05em;
}
.workflow > * {
  padding: 6px 6px;
  border-right: 1px solid var(--grid);
  border-bottom: 1px solid var(--grid);
  min-height: 28px;
  display: flex;
  align-items: center;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.workflow .agent-name {
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 500;
  text-transform: none;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.workflow .stage-head {
  font-size: 10px;
  font-family: var(--font-sans);
  color: var(--muted);
  background: var(--grid-soft);
  border-bottom: 1px solid var(--ink);
  min-height: 36px;
  line-height: 1.2;
}
.workflow .dot {
  justify-content: center;
}
.workflow .dot.on::before {
  content: "●";
  color: var(--ink);
  font-size: 10px;
}
.workflow .dot.on.partial::before {
  content: "○";
}

/* ---------- AI demo cards (Page 11-12) ---------- */
.demo {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 48px;
  height: 100%;
  align-items: stretch;
}
.demo-narrative {
  display: flex;
  flex-direction: column;
  gap: 18px;
  justify-content: center;
}
.demo-narrative h2 {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.05;
  font-weight: 500;
}
.demo-narrative h2 em { font-style: normal; }
.demo-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 15px;
  color: var(--ink-soft);
  border-top: 1px solid var(--grid);
  padding-top: 18px;
}
.demo-bullets li {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 8px;
}
.demo-bullets li::before {
  content: counter(d, decimal-leading-zero);
  counter-increment: d;
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  padding-top: 4px;
}
.demo-bullets { counter-reset: d; }
.demo-visual {
  position: relative;
  background: var(--grid-soft);
  border: 1px solid var(--grid);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  font-family: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink);
  white-space: pre;
  overflow: auto;
}
.demo-visual code {
  font-family: inherit;
}

/* ---------- About: timeline (Page 13) ---------- */
.timeline {
  display: grid;
  grid-template-columns: 96px 1fr;
  column-gap: 28px;
  row-gap: 12px;
  border-top: 1px solid var(--ink);
  padding-top: 14px;
  font-size: 13px;
}
.timeline .year {
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.timeline .item {
  border-bottom: 1px solid var(--grid);
  padding-bottom: 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.timeline .item-title {
  font-weight: 500;
  color: var(--ink);
  font-size: 14px;
}
.timeline .item-meta {
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.timeline .item-desc {
  color: var(--ink-soft);
  margin-top: 2px;
  font-size: 13px;
  line-height: 1.45;
}

/* ---------- Contact (Page 14) ---------- */
.page--contact {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: 1fr auto;
  gap: var(--col-gap);
  row-gap: 48px;
  padding-top: calc(var(--margin-y) + 56px);
  padding-bottom: calc(var(--margin-y) + 72px);
}
.contact-cta {
  grid-column: 1 / span 8;
  align-self: end;
  font-family: var(--font-serif);
  font-size: clamp(34px, 4.4vw, 60px);
  line-height: 1.05;
  font-weight: 500;
  letter-spacing: -0.018em;
}
.contact-cta em { font-style: normal; }
.contact-info {
  grid-column: 9 / span 4;
  align-self: end;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 14px;
  letter-spacing: 0.04em;
  border-top: 1px solid var(--ink);
  padding-top: 16px;
}
.contact-info dt {
  font-size: var(--caption);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 8px;
}
.contact-info dd { color: var(--ink); }
.contact-footer {
  grid-column: 1 / span 12;
  align-self: end;
  font-family: var(--font-serif);
  font-size: clamp(80px, 14vw, 200px);
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 0.85;
  color: var(--ink);
  border-top: 1px solid var(--ink);
  padding-top: 16px;
  font-style: normal;
}

/* ---------- Tools matrix page layout ---------- */
.page--tools {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--col-gap);
  align-content: start;
  padding-top: calc(var(--margin-y) + 80px);
}
.page--tools .eyebrow { grid-column: 1 / span 12; }
.page--tools h2 {
  grid-column: 1 / span 12;
  font-family: var(--font-serif);
  font-size: var(--h2);
  font-weight: 500;
  margin: 8px 0 24px;
}
.page--tools .matrix { grid-column: 1 / span 12; }

/* ---------- Workflow page ---------- */
.page--workflow {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--col-gap);
  align-content: start;
  padding-top: calc(var(--margin-y) + 56px);
  padding-bottom: calc(var(--margin-y) + 72px);
}
.page--workflow .eyebrow { grid-column: 1 / span 12; }
.page--workflow h2 {
  grid-column: 1 / span 12;
  font-family: var(--font-serif);
  font-size: clamp(24px, 3vw, 40px);
  font-weight: 500;
  margin: 6px 0 12px;
  line-height: 1;
}
.page--workflow .lede {
  grid-column: 1 / span 8;
  margin-bottom: 20px;
  font-size: 15px;
  line-height: 1.45;
}
.page--workflow .workflow { grid-column: 1 / span 12; }

/* ---------- About layout ---------- */
.page--about {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--col-gap);
  align-content: start;
  padding-top: calc(var(--margin-y) + 56px);
  padding-bottom: calc(var(--margin-y) + 72px);
}
.page--about .eyebrow { grid-column: 1 / span 12; }
.page--about h2 {
  grid-column: 1 / span 12;
  font-family: var(--font-serif);
  font-size: clamp(36px, 4.6vw, 62px);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.018em;
  margin: 8px 0 28px;
}
.page--about h2 em {
  font-style: normal;
}
.page--about .timeline {
  grid-column: 1 / span 7;
}
.page--about .about-aside {
  grid-column: 9 / span 4;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.page--about .about-aside h3 {
  font-family: var(--font-sans);
  font-size: var(--caption);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}
.page--about .about-aside p {
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-soft);
  font-weight: 400;
}

/* ---------- iPad / touch tweaks ---------- */
@media (max-width: 1100px) {
  :root { --margin-x: 40px; }
}
@media (orientation: portrait) {
  /* Discourage portrait — this deck is built for landscape */
  body::before {
    content: "Please rotate to landscape ⤺";
    position: fixed;
    inset: 0;
    background: var(--bg);
    color: var(--ink);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-size: 24px;
    z-index: 999;
  }
}
@media (prefers-reduced-motion: reduce) {
  .page { transition: none; }
}

/* =========================================================
   v2 — overrides & additions
   ========================================================= */

/* --- Skill grid (Page 07 — 5 columns) --- */
.skill-grid {
  grid-column: 1 / span 12;
  display: grid;
  grid-template-columns: 130px 175px 145px 1fr 1.05fr;
  border-top: 1px solid var(--ink);
  margin-top: 12px;
}
.skill-grid-head { display: contents; }
.skill-grid-head > div {
  padding: 10px 14px;
  border-bottom: 1px solid var(--ink);
  font-family: var(--font-sans);
  font-size: var(--caption);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.skill-row { display: contents; }
.skill-row > div {
  padding: 9px 14px;
  border-bottom: 1px solid var(--grid);
  display: flex;
  align-items: center;
  min-height: 38px;
  font-family: var(--font-sans);
}
.skill-row > .skill-name {
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: 0;
  font-weight: 500;
  color: var(--ink);
}
.skill-row > .skill-tags {
  font-size: 12px;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}
.skill-row > .skill-bar {
  padding: 12px 14px;
  flex-direction: column;
  align-items: stretch;
  gap: 5px;
  justify-content: center;
}
.skill-row > .skill-bar::before {
  content: attr(data-pct);
  font-family: var(--font-sans);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  color: var(--muted);
  align-self: flex-start;
}
.skill-row > .skill-bar > span {
  display: block;
  height: 3px;
  background: var(--muted);
  flex-shrink: 0;
}
.skill-row > .skill-how {
  font-size: 12.5px;
  color: var(--ink-soft);
  line-height: 1.45;
}
.skill-row > .skill-signal {
  font-size: 12px;
  color: var(--muted);
  font-style: normal;
  line-height: 1.45;
  font-family: var(--font-serif);
  font-weight: 400;
}

.skill-basics {
  grid-column: 1 / span 12;
  margin-top: 16px;
  padding-top: 12px;
  padding-right: 220px;  /* clear of prev/next nav */
  border-top: 1px solid var(--grid);
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  line-height: 1.7;
}
.skill-basics .basics-label {
  color: var(--muted);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-right: 4px;
  font-size: 10px;
}

/* --- GH figure (Page 08) --- */
.gh-figure {
  background: var(--bg);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  border: 1px solid var(--grid);
}
.gh-figure img {
  width: 100%;
  height: 100%;
  max-height: 100%;
  object-fit: contain;
}
.gh-note {
  position: absolute;
  bottom: 6px;
  left: 12px;
  font-family: var(--font-sans);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--bg);
  padding: 2px 6px;
}

/* --- Demo lede (P11/12) — Chinese body uses sans --- */
.demo-lede {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  font-weight: 400;
}

/* --- Page padding adjustments to keep content clear of nav --- */
.page--tools  { padding-bottom: calc(var(--margin-y) + 120px); }
.page--case   { padding-bottom: calc(var(--margin-y) + 96px); }
.page--workflow { padding-bottom: calc(var(--margin-y) + 96px); }
.skill-basics { padding-right: 200px; }  /* keep clear of (PREV)(NEXT) cluster */

/* --- CN weight control: keep Chinese text from competing with serif headings --- */
.case-narrative,
.lede,
.demo-lede,
.timeline .item-desc,
.about-aside p,
.cover-caption {
  font-weight: 400;
}

/* --- More breathing room around case thumbs (fixes P05 close-to-nav) --- */
.case-thumbs {
  margin-bottom: 8px;
}

/* --- Hub card minor: align card bodies top so weight pinned to bottom --- */
.hub-card > div { display: flex; flex-direction: column; gap: 8px; }

/* =========================================================
   Chapter accent colors
   ========================================================= */
.page[data-section="Cover"] .cover-title em {
  color: var(--muted);
}
.page[data-section="Hub"] .hub-title em {
  color: var(--muted);
}
.page[data-section="Design"] .editorial-title em {
  color: var(--accent-green);
}
.page[data-section="Tools"] .editorial-title em {
  color: var(--accent-blue);
}
.page[data-section="AI Workflow"] .editorial-title em {
  color: var(--accent-red);
}
.page[data-section="AI Workflow"] .demo-narrative h2 em {
  color: var(--accent-red);
}

/* Hub card subtitle italics — match each chapter's accent */
.hub-cards .hub-card:nth-child(1) .card-title em { color: var(--accent-green); }
.hub-cards .hub-card:nth-child(2) .card-title em { color: var(--accent-blue); }
.hub-cards .hub-card:nth-child(3) .card-title em { color: var(--accent-red); }

/* No italic — emphasis is color only. Weight inherited from parent. */
em, i {
  font-family: var(--font-serif);
  font-style: normal;
}
.case-title em {
  font-family: var(--font-serif);
  font-style: normal;
  font-weight: 500;
}

/* =========================================================
   Weight system — bold titles, medium body, no italic
   ========================================================= */

/* Body / paragraphs — medium (500) */
body,
p, dl, dd, ul, ol, li,
.lede, .case-narrative, .demo-lede,
.cover-caption, .cover-meta,
.case-meta, .case-meta dt, .case-meta dd,
.timeline, .timeline .item-desc,
.about-aside p,
.skill-tags, .skill-how, .skill-signal, .skill-basics,
.matrix-row > *,
.demo-bullets li,
.contact-info, .contact-info dt, .contact-info dd,
.eyebrow, .case-no, .card-no, .card-weight, .card-desc,
.nav-btn, .deck-header, .breadcrumb, .counter, .brand,
.workflow > *, .workflow .agent-name, .workflow .stage-head {
  font-weight: 500;
}

/* Titles — bold (700) */
h1, h2, h3, h4,
.cover-title,
.hub-title, .hub-card .card-title,
.editorial-title,
.case-title,
.contact-cta,
.contact-footer,
.skill-name,
.timeline .item-title,
.demo-narrative h2,
.page--tools h2,
.page--workflow h2,
.page--about h2 {
  font-weight: 700;
}

/* em inside titles — bump to 900 to compensate for colour's perceived thinness */
em, i {
  font-weight: 900;
}
.case-title em {
  font-weight: 400;  /* case sub-title intentionally lighter */
}
.skill-row > .skill-signal {
  font-style: normal;
  font-weight: 500;
}

/* No text-shadow — keep glyphs clean. Use a slightly larger em font-size
   to compensate for the visual thinness that lighter colours introduce. */
em {
  text-shadow: none;
}
/* All title em inherit parent's weight (700) — fix earlier 400 overrides */
.cover-title em,
.hub-title em,
.editorial-title em,
.demo-narrative h2 em,
.page--about h2 em,
.hub-card .card-title em {
  font-size: 1.05em;
  font-weight: inherit;
}

/* Grey em — muted grey */
.page[data-section="Hub"] .hub-title em,
.page[data-section="About"] .page--about h2 em {
  color: var(--muted);
}

/* Cover-specific: name grey, AI Lab back to black at base size */
.cover-title .name-grey {
  color: var(--muted);
}
.page[data-section="Cover"] .cover-title em {
  color: var(--ink);
  font-size: 1em;
}

/* Contact (P14) em — black, no size bump, just inherit */
.page[data-section="Contact"] .contact-cta em,
.page[data-section="Contact"] .contact-footer em {
  color: var(--ink);
  font-size: inherit;
}
.contact-cta em {
  margin-right: 0.12em;  /* breathe before the trailing "?" */
}

/* Caption / labels keep medium for legibility */
.eyebrow, .case-no, .card-no, .card-weight,
.case-meta dt, .case-meta dd,
.matrix-head > *, .skill-grid-head > div,
.contact-info dt {
  font-weight: 500;
}