/* ============================================================
   LEO SPEKTOR — PORTFOLIO 2026
   Design system: "Quiet Editorial"
   Warm paper · ink typography · one restrained accent
   ------------------------------------------------------------
   1. Tokens
   2. Base & reset
   3. Typography
   4. Layout primitives
   5. Header / navigation
   6. Footer
   7. Components (frames, figures, cards, chips, stats…)
   8. Home page
   9. Projects index
   10. Case study
   11. Lightbox
   12. Motion
   13. Responsive
   ============================================================ */

/* ── 1. TOKENS ─────────────────────────────────────────────── */
:root {
  /* color */
  --paper: #F6F4EF;
  --surface: #FFFFFF;
  --ink: #1A1815;
  --ink-2: #545047;
  --ink-3: #6F695E;
  --line: rgba(26, 24, 21, 0.14);
  --line-soft: rgba(26, 24, 21, 0.08);
  --accent: #2E5A4B;
  --accent-ink: #24483C;

  /* signal dots (security levels) */
  --dot-ch: #2E5A4B;
  --dot-eu: #44599E;
  --dot-us: #B4762A;

  /* type */
  --font-serif: 'Newsreader', 'Times New Roman', serif;
  --font-sans: 'Instrument Sans', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Spline Sans Mono', 'SF Mono', monospace;

  /* serif scale — 4 steps */
  --text-display: clamp(2.9rem, 1.4rem + 6vw, 6.2rem);
  --text-h2: clamp(1.75rem, 1.25rem + 1.9vw, 2.75rem);
  --text-title: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  --text-sub: clamp(1.25rem, 1.05rem + 0.9vw, 1.625rem);
  --weight-serif: 440;  /* single serif weight for all display & headings */
  /* sans scale — 2 steps + body */
  --text-body: 1.0625rem;
  --text-small: 0.875rem;
  /* mono scale */
  --text-mono: 0.75rem;
  --text-mono-sm: 0.6875rem;
  --track-mono: 0.07em;

  /* layout */
  --container: 1264px;
  --gutter: clamp(1.25rem, 5vw, 4rem);
  --space-section: clamp(6rem, 7vw + 3rem, 10rem);
  --space-block: clamp(2.5rem, 4vw, 4rem);
  --measure: 41.25rem; /* prose column ≈ 66ch */

  /* shape */
  --radius: 10px;
  --radius-lg: 14px;
  --shadow-frame: 0 1px 2px rgba(26,24,21,0.04), 0 8px 32px rgba(26,24,21,0.05);
  --shadow-lift: 0 2px 6px rgba(26,24,21,0.05), 0 18px 48px rgba(26,24,21,0.09);

  /* motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 0.25s;  /* color feedback */
  --dur-med: 0.35s;   /* underlines, arrows, overlays */
  --dur-slow: 0.5s;   /* shadows, header */
  --dur: 0.7s;        /* scroll reveals */
  --dur-zoom: 0.8s;   /* media scale */
}

/* ── 2. BASE ───────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

::selection { background: var(--accent); color: var(--paper); }

img, video, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: 1rem; top: -3rem;
  z-index: 200;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--paper);
  border-radius: 6px;
  font-size: var(--text-small);
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: 1rem; }

/* ── 3. TYPOGRAPHY ─────────────────────────────────────────── */
.t-display {
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: var(--text-display);
  line-height: 1.02;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

.t-h2 {
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: var(--text-h2);
  line-height: 1.12;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.t-lead {
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: var(--text-sub);
  line-height: 1.32;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

.t-mono {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  font-weight: 400;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--ink-3);
}

.t-body-2 { color: var(--ink-2); }

em { font-style: italic; }

/* inline link — animated underline */
.link {
  position: relative;
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 100% 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  transition: color var(--dur-fast) var(--ease-out), background-size var(--dur-med) var(--ease-out);
  padding-bottom: 1px;
}
.link:hover { color: var(--accent-ink); }

/* arrow link (external / forward) */
.arrow-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4em;
  font-weight: 500;
  font-size: var(--text-small);
  color: var(--ink);
  transition: color var(--dur-fast) var(--ease-out);
}
.arrow-link .arrow { transition: transform var(--dur-med) var(--ease-out); }
.arrow-link:hover { color: var(--accent-ink); }
.arrow-link:hover .arrow { transform: translate(2px, -2px); }

.arrow {
  width: 0.7em; height: 0.7em;
  flex: none;
  align-self: center;
}

/* ── 4. LAYOUT ─────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--space-section) 0; }

[id] { scroll-margin-top: 5.5rem; }

.prose { max-width: var(--measure); }
.mt-block { margin-top: var(--space-block); }
.fine-print {
  margin-top: 1.25rem;
  font-size: var(--text-small);
  color: var(--ink-3);
}
.prose p + p { margin-top: 1.25em; }
.prose > * + * { margin-top: 1.25em; }

/* ── 5. HEADER ─────────────────────────────────────────────── */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  transition: transform var(--dur-slow) var(--ease-out), background-color 0.4s ease, border-color 0.4s ease;
  border-bottom: 1px solid transparent;
  background: transparent;
}
.site-header.is-solid {
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line-soft);
}
.site-header.is-hidden { transform: translateY(-100%); }

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.wordmark {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1;
  transition: color var(--dur-fast) var(--ease-out);
}
.wordmark:hover { color: var(--accent-ink); }

.site-nav ul {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 3vw, 2.25rem);
  list-style: none;
}

.site-nav a {
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--ink-2);
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 0% 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  padding-bottom: 2px;
  transition: color var(--dur-fast) var(--ease-out), background-size var(--dur-med) var(--ease-out);
}
.site-nav a:hover { color: var(--ink); background-size: 100% 1px; }
.site-nav a[aria-current="page"] { color: var(--ink); background-size: 100% 1px; }

/* ── 6. FOOTER ─────────────────────────────────────────────── */
.site-footer {
  margin-top: var(--space-section);
  border-top: 1px solid var(--line-soft);
  padding-block: clamp(4rem, 7vw, 6.5rem) 2.5rem;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: end;
}

.site-footer__title {
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: var(--text-h2);
  line-height: 1.05;
  letter-spacing: -0.015em;
}

.site-footer__email {
  display: inline-block;
  margin-top: 1rem;
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: var(--text-sub);
  font-style: italic;
  color: var(--ink-2);
  transition: color var(--dur-fast) var(--ease-out);
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 100% 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
}
.site-footer__email:hover { color: var(--accent-ink); }

.site-footer__meta {
  display: grid;
  gap: 0.65rem;
  justify-items: start;
  font-size: var(--text-small);
  color: var(--ink-2);
}

.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: clamp(3.5rem, 6vw, 5.5rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--line-soft);
  color: var(--ink-3);
  font-size: var(--text-small);
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  font-size: var(--text-small);
  color: var(--ink-3);
  transition: color var(--dur-fast) var(--ease-out);
}
.to-top:hover { color: var(--ink); }
.to-top .arrow { transition: transform var(--dur-med) var(--ease-out); }
.to-top:hover .arrow { transform: translateY(-2px); }

/* ── 7. COMPONENTS ─────────────────────────────────────────── */

/* media frame — the single treatment for every screenshot/video */
.frame {
  position: relative;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: var(--surface);
  box-shadow: var(--shadow-frame);
  overflow: hidden;
}
.frame > img,
.frame > video {
  width: 100%;
  height: auto;
  transition: transform var(--dur-zoom) var(--ease-out);
}
.frame > video { transform: scale(1.015); clip-path: inset(1px 0); }

.frame--zoomable { cursor: zoom-in; }
.frame--zoomable:hover > img { transform: scale(1.02); }

/* figure with mono label above */
.figure { margin: 0; min-width: 0; }
.figure > figcaption {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.65rem;
}

/* media grids */
.media-grid {
  display: grid;
  gap: 1.25rem;
  margin-top: var(--space-block);
}
.media-grid--2 { grid-template-columns: repeat(2, 1fr); }
.media-grid--3 { grid-template-columns: repeat(3, 1fr); }
.media-grid--4 { grid-template-columns: repeat(4, 1fr); }

/* flex row for mixed aspect ratios: flex = width/height per column */
.media-row {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  margin-top: var(--space-block);
}
.media-row .figure { min-width: 0; }

/* stack inside a grid cell */
.media-stack { display: grid; gap: 1.25rem; align-content: start; }

/* index list — the "ledger" pattern for scope, deliverables, inventories.
   Numbered ruled rows; optional right-hand mono annotation. */
.index-list {
  list-style: none;
  counter-reset: index;
  columns: 2;
  column-gap: clamp(2rem, 5vw, 5rem);
  margin-top: var(--space-block);
}
.index-list > li {
  counter-increment: index;
  display: flex;
  align-items: baseline;
  gap: 1.1rem;
  padding-block: 0.8rem;
  border-top: 1px solid var(--line-soft);
  font-size: var(--text-small);
  min-width: 0;
  break-inside: avoid;
}
.index-list > li::before {
  content: counter(index, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--text-mono-sm);
  letter-spacing: 0.05em;
  color: var(--ink-3);
  flex: none;
}
.index-list__term { flex: 1; font-weight: 500; color: var(--ink); }
.index-list__note {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--ink-3);
  white-space: nowrap;
}

/* stat */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: var(--space-block);
}
.stat {
  border-top: 1px solid var(--line);
  padding-top: 1.25rem;
}
.stat__value {
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: var(--text-h2);
  line-height: 1.05;
  letter-spacing: -0.01em;
}
.stat__label {
  display: block;
  margin-top: 0.6rem;
  font-size: var(--text-small);
  color: var(--ink-2);
}

/* quote */
.pullquote {
  margin: var(--space-block) auto;
  max-width: 46rem;
  text-align: center;
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: var(--weight-serif);
  font-size: var(--text-h2);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--ink);
  padding-block: clamp(2rem, 4vw, 3.5rem);
}
.pullquote::before {
  content: "";
  display: block;
  width: 2.5rem;
  height: 1px;
  background: var(--ink);
  margin: 0 auto 2rem;
  opacity: 0.35;
}

/* info cards (plans, security levels, ecosystem…) */
.card-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: var(--space-block);
}
.card {
  background: var(--surface);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.6rem 1.75rem;
  box-shadow: var(--shadow-frame);
}
.card__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 1.1rem;
}
.card__badge::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--ink-3);
}
.card__badge--ch::before { background: var(--dot-ch); }
.card__badge--eu::before { background: var(--dot-eu); }
.card__badge--us::before { background: var(--dot-us); }
.card__title {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.0625rem;
  margin-bottom: 0.45rem;
}
.card__desc {
  font-size: var(--text-small);
  line-height: 1.6;
  color: var(--ink-2);
}

/* journey stepper */
.journey {
  margin-top: var(--space-block);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-frame);
  padding: 1.75rem;
}
.journey__steps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--ink);
}
.journey__arrow { color: var(--ink-3); font-family: var(--font-sans); }
.journey__plans {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 1.6rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--line-soft);
}
.journey__plan-name {
  font-weight: 600;
  font-size: var(--text-small);
  margin-bottom: 0.3rem;
}
.journey__plan-desc {
  font-size: var(--text-small);
  line-height: 1.6;
  color: var(--ink-2);
}

/* numbered editorial list (lessons) */
.numbered-list {
  list-style: none;
  counter-reset: lessons;
  margin-top: var(--space-block);
  max-width: var(--measure);
}
.numbered-list > li {
  counter-increment: lessons;
  position: relative;
  padding: 1.5rem 0 1.5rem 3.5rem;
  border-top: 1px solid var(--line-soft);
}
.numbered-list > li:last-child { border-bottom: 1px solid var(--line-soft); }
.numbered-list > li::before {
  content: counter(lessons, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1.75rem;
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--track-mono);
  color: var(--ink-3);
}

/* ── 8. HOME ───────────────────────────────────────────────── */
.hero-home {
  padding-top: clamp(9rem, 16vh, 13rem);
}
.hero-home__bio {
  max-width: 20em;
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: clamp(1.35rem, 1.05rem + 1.4vw, 2.125rem);
  line-height: 1.32;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}
.hero-home__hello {
  font-style: italic;
  color: var(--ink-3);
}
.hero-home__bio a { font-style: italic; }
.hero-home__bio .link { background-size: 100% 1px; }

.work-index { margin-top: var(--space-section); }
.work-index__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line-soft);
}

.work-featured {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(1.5rem, 3vw, 3rem);
  margin-top: clamp(2rem, 4vw, 3rem);
}

.work-card { display: block; }
.work-card .frame { aspect-ratio: 16 / 10; }
.work-card .frame > img,
.work-card .frame > video {
  width: 100%; height: 100%;
  object-fit: cover;
}
.work-card:hover .frame > img,
.work-card:hover .frame > video { transform: scale(1.02); }
.work-card .frame { transition: box-shadow var(--dur-slow) var(--ease-out); }
.work-card:hover .frame { box-shadow: var(--shadow-lift); }

.work-card__meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.4rem;
}
.work-card__title {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: var(--text-title);
  letter-spacing: -0.01em;
  line-height: 1.15;
}
.work-card__title .arrow {
  width: 0.55em; height: 0.55em;
  opacity: 0;
  transform: translate(-4px, 4px);
  transition: opacity var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out);
  color: var(--accent-ink);
}
.work-card:hover .work-card__title .arrow { opacity: 1; transform: translate(0, 0); }
.work-card__desc {
  margin-top: 0.6rem;
  max-width: 34em;
  font-size: var(--text-small);
  line-height: 1.6;
  color: var(--ink-2);
}

/* ── 9. PROJECTS INDEX ─────────────────────────────────────── */
.page-head {
  padding-top: clamp(8.5rem, 15vh, 12rem);
}
/* ── 10. CASE STUDY ────────────────────────────────────────── */
.case-hero {
  padding-top: clamp(8.5rem, 15vh, 12rem);
}
.case-hero__eyebrow { margin-bottom: 1.5rem; }
.case-hero__subtitle {
  margin-top: 1.5rem;
  max-width: 24em;
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: var(--weight-serif);
  font-size: var(--text-sub);
  line-height: 1.35;
  color: var(--ink-2);
}

.case-meta {
  display: flex;
  flex-wrap: wrap;
  column-gap: clamp(1.5rem, 4vw, 4rem);
  row-gap: 1.5rem;
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--line-soft);
}
.case-meta__label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.4rem;
}
.case-meta__value { font-size: var(--text-small); font-weight: 500; }

.case-hero__media { margin-top: clamp(2.5rem, 5vw, 4rem); }

.case-intro {
  margin-top: clamp(3rem, 6vw, 5rem);
  max-width: 30em;
}

/* layout: sticky rail + content */
.case-body {
  display: grid;
  grid-template-columns: 13rem minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 5rem);
  margin-top: var(--space-section);
}

.case-toc {
  position: sticky;
  top: 7rem;
  align-self: start;
  max-height: calc(100vh - 9rem);
  overflow-y: auto;
  overflow-x: hidden;
  padding-right: 6px; /* room for the 4px active-link shift, so it never overflows */
  scrollbar-width: none; /* Firefox */
}
.case-toc::-webkit-scrollbar { display: none; } /* WebKit */
.case-toc ol {
  list-style: none;
  display: grid;
  gap: 0.15rem;
}
.case-toc a {
  display: flex;
  gap: 0.7em;
  align-items: baseline;
  padding: 0.32rem 0;
  font-size: var(--text-small);
  color: var(--ink-3);
  transition: color var(--dur-fast) var(--ease-out), transform var(--dur-med) var(--ease-out);
}
.case-toc a .case-toc__num {
  font-family: var(--font-mono);
  font-size: var(--text-mono-sm);
  letter-spacing: 0.05em;
}
.case-toc a:hover { color: var(--ink); }
.case-toc a.is-active { color: var(--ink); transform: translateX(4px); }
.case-toc a.is-active .case-toc__num { color: var(--accent-ink); }

.case-section { padding-bottom: var(--space-section); }
.case-section:last-of-type { padding-bottom: 0; }
.case-section__label { margin-bottom: 1.1rem; }
.case-section .t-h2 { max-width: 18em; }
.case-section .prose { margin-top: 1.75rem; }

/* full-width media inside case section */
.media-solo { margin-top: var(--space-block); }

/* subsection heading inside a case section */
.case-sub {
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: var(--text-title);
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin-top: calc(var(--space-block) * 1.6);
}
.case-sub + .prose { margin-top: 1.25rem; }

/* prev / next navigation */
.case-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: var(--space-section);
  padding-top: 2.5rem;
  border-top: 1px solid var(--line-soft);
}
.case-nav__card {
  display: block;
  padding: 1.75rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-frame);
  transition: box-shadow var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}
.case-nav__card:hover { box-shadow: var(--shadow-lift); transform: translateY(-2px); }
.case-nav__card--next { text-align: right; }
.case-nav__label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.75rem;
}
.case-nav__title {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: var(--text-title);
  letter-spacing: -0.01em;
  line-height: 1.1;
}
.case-nav__title .arrow {
  width: 0.5em; height: 0.5em;
  align-self: center;
  transition: transform var(--dur-med) var(--ease-out);
  color: var(--accent-ink);
}
.case-nav__card:hover .case-nav__title .arrow { transform: translate(2px, -2px); }
.case-nav__card--back:hover .case-nav__title .arrow { transform: translateX(-3px); }

@media (max-width: 640px) {
  .case-nav { grid-template-columns: 1fr; }
  .case-nav__card--next { text-align: left; }
}

/* ── 10b. EXTENDED CASE COMPONENTS ─────────────────────────── */

/* 4-up card row (constraints) */
.card-row--4 { grid-template-columns: repeat(4, 1fr); }

.card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--track-mono);
  color: var(--ink-3);
  margin-bottom: 1rem;
}

.card__list {
  list-style: none;
  margin-top: 0.35rem;
}
.card__list li {
  font-size: var(--text-small);
  line-height: 1.6;
  color: var(--ink-2);
  padding: 0.45rem 0;
  border-top: 1px solid var(--line-soft);
}
.card__list li:first-child { border-top: none; }

/* small filled flag (e.g. "before redesign") */
.badge-flag {
  display: inline-block;
  vertical-align: baseline;
  margin-left: 0.5em;
  padding: 0.12rem 0.55rem;
  border-radius: 4px;
  background: var(--accent);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: var(--text-mono-sm);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
}

.stat-grid--3 { grid-template-columns: repeat(3, 1fr); }

/* oversized single result stat */
.result-feature {
  margin-top: var(--space-block);
  padding: clamp(2.5rem, 5vw, 4rem);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-frame);
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: clamp(1.5rem, 4vw, 3.5rem);
}
.result-feature__value {
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: var(--text-display);
  line-height: 0.95;
  letter-spacing: -0.015em;
  color: var(--accent-ink);
}
.result-feature__text {
  max-width: 24em;
  color: var(--ink-2);
}

/* quote card (testimonial with avatar) */
.quote-card {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  margin-top: 1.25rem;
  padding: 1.6rem 1.75rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-frame);
}
.quote-card__avatar {
  width: 3rem; height: 3rem;
  border-radius: 50%;
  object-fit: cover;
  flex: none;
}
.quote-card__name { font-weight: 600; font-size: var(--text-small); }
.quote-card__meta {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--ink-3);
  margin-left: 0.75em;
}
.quote-card__text {
  margin-top: 0.5rem;
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-style: italic;
  font-size: var(--text-sub);
  line-height: 1.4;
}

/* run-in keyword line — dense sets (e.g. resume skills) */
.tag-line { list-style: none; max-width: var(--measure); }
.tag-line li {
  display: inline;
  font-family: var(--font-mono);
  font-size: var(--text-small);
  line-height: 2.1;
  letter-spacing: 0.02em;
  color: var(--ink-2);
}
.tag-line li:not(:last-child)::after {
  content: "·";
  color: var(--ink-3);
  margin: 0 0.6em;
}

/* gesture cards (gif reference + product video) */
.gesture-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: var(--space-block);
}
.gesture-card {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: 1.25rem;
  align-items: stretch;
}
.gesture-card .frame { height: 100%; }
.gesture-card .frame > img,
.gesture-card .frame > video { height: 100%; object-fit: cover; }

/* ── 10c. RESUME ───────────────────────────────────────────── */
.cv-section { margin-top: var(--space-section); }
.cv-section__head {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}
.cv-section__num {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--track-mono);
  color: var(--ink-3);
}
.cv-section__title {
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: var(--text-h2);
  letter-spacing: -0.01em;
  line-height: 1.12;
}

.cv-row {
  display: grid;
  grid-template-columns: 16rem minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  padding-block: clamp(1.75rem, 3vw, 2.5rem);
  border-top: 1px solid var(--line-soft);
}
.cv-row:first-of-type { border-top: none; }

.cv-company { font-weight: 600; font-size: 1.0625rem; }
.cv-role { margin-top: 0.3rem; font-size: var(--text-small); color: var(--ink-2); }
.cv-date, .cv-location {
  margin-top: 0.55rem;
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--ink-3);
}
.cv-location { margin-top: 0.3rem; text-transform: none; letter-spacing: 0.02em; }

.cv-bullets {
  list-style: none;
  margin-top: 1rem;
  max-width: var(--measure);
}
.cv-bullets li {
  position: relative;
  padding: 0.5rem 0 0.5rem 1.4rem;
  color: var(--ink-2);
  font-size: var(--text-small);
  line-height: 1.6;
}
.cv-bullets li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--ink-3);
}

.cv-skill-row {
  display: grid;
  grid-template-columns: 16rem minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  padding-block: 1.5rem;
  border-top: 1px solid var(--line-soft);
  align-items: start;
}
.cv-skill-row:first-of-type { border-top: none; }
.cv-skill-label { font-weight: 600; font-size: var(--text-small); padding-top: 0.2rem; }

.cv-lang-row {
  display: grid;
  grid-template-columns: 16rem minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  padding-block: 1.1rem;
  border-top: 1px solid var(--line-soft);
}
.cv-lang-row:first-of-type { border-top: none; }
.cv-lang-name { font-weight: 600; font-size: var(--text-small); }
.cv-lang-level { color: var(--ink-2); font-size: var(--text-small); }

/* ── 10d. CONTACT ──────────────────────────────────────────── */
.contact-hero {
  padding-top: clamp(9rem, 18vh, 14rem);
  min-height: 62vh;
}
.contact-hero__title {
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: var(--text-display);
  line-height: 1;
  letter-spacing: -0.015em;
  margin-top: 1.5rem;
}
.contact-list {
  margin-top: clamp(3rem, 6vw, 5rem);
  border-top: 1px solid var(--line);
}
.contact-list__row {
  display: grid;
  grid-template-columns: 16rem minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  padding-block: 1.5rem;
  border-bottom: 1px solid var(--line-soft);
  align-items: baseline;
}
.contact-list__label {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--ink-3);
}
.contact-list__value {
  font-family: var(--font-serif);
  font-weight: var(--weight-serif);
  font-size: var(--text-sub);
  letter-spacing: -0.01em;
}
.contact-list__value a { transition: color var(--dur-fast) var(--ease-out); }
.contact-list__value a:hover { color: var(--accent-ink); }

@media (max-width: 900px) {
  .card-row--4 { grid-template-columns: repeat(2, 1fr); }
  .gesture-grid { grid-template-columns: 1fr; }
  .cv-row, .cv-skill-row, .cv-lang-row, .contact-list__row { grid-template-columns: 1fr; gap: 0.75rem; }
}
@media (max-width: 640px) {
  .card-row--4 { grid-template-columns: 1fr; }
  .result-feature { grid-template-columns: 1fr; gap: 1rem; }
  .gesture-card { grid-template-columns: 1fr; }
  .gesture-card .frame > img { max-height: 320px; }
}

/* ── 11. LIGHTBOX ──────────────────────────────────────────── */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(1rem, 4vw, 3.5rem);
  background: rgba(20, 18, 14, 0.9);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-med) var(--ease-out), visibility var(--dur-med);
  cursor: zoom-out;
}
.lightbox.is-open { opacity: 1; visibility: visible; }
.lightbox img {
  max-width: 100%;
  max-height: 100%;
  width: auto; height: auto;
  border-radius: var(--radius);
  transform: scale(0.965);
  transition: transform var(--dur-slow) var(--ease-out);
}
.lightbox.is-open img { transform: scale(1); }

/* ── 12. MOTION ────────────────────────────────────────────── */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
  transition-delay: var(--reveal-delay, 0s);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* cross-document view transition (progressive enhancement) */
@view-transition { navigation: auto; }
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 0.35s;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .frame > img, .frame > video,
  .arrow-link .arrow, .work-card__title .arrow { transition: none !important; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── 13. RESPONSIVE ────────────────────────────────────────── */
@media (max-width: 1160px) {
  .case-body { grid-template-columns: 1fr; }
  .case-toc { display: none; }
}

@media (max-width: 900px) {
  .media-grid--3 { grid-template-columns: repeat(2, 1fr); }
  .media-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .card-row { grid-template-columns: 1fr; }
  .journey__plans { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .work-featured { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  :root { --space-block: 2.25rem; }
  .media-grid--2, .media-grid--3 { grid-template-columns: 1fr; }
  .media-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .media-row { flex-direction: column; }
  .media-row > .figure { width: 100%; flex: none !important; }
  .index-list { columns: 1; }
  .stat-grid { grid-template-columns: 1fr 1fr; gap: 1.5rem; }
  .site-footer__grid { grid-template-columns: 1fr; align-items: start; }
  .numbered-list > li { padding-left: 2.75rem; }
  .site-nav ul { gap: 1.1rem; }
}