/* ==========================================================================
   Ali Taylor — portfolio
   WIREFRAME STYLESHEET
   Layout, spacing and responsive behaviour only. No brand styling.
   Replace the tokens below (and the font stacks) to apply a visual style.
   ========================================================================== */

:root {
  /* Palette, from the Portfolio 2024 Figma file (colour variables).
     Not used directly yet: map them onto the role tokens below. */
  --chocolate-40: #efe2db;
  --chocolate-80: #6d4c3b;
  --chocolate-100: #3f2c22;
  --strawberry-20: #fff0f4;
  --strawberry-40: #ffd3e0;
  --strawberry-80: #e21212;
  --vanilla-20: #fefaf1;
  --vanilla-40: #fdeec7;
  --blueberry-80: #4a5aa8;
  --mint-100: #284124;
  --mint-40: #c2dbbd;
  --mint-20: #e4eee2;

  /* Role tokens. Every colour on the site comes from these. */
  --bg: var(--vanilla-20); /* page */
  --fg: var(--chocolate-100);   /* text, borders */
  --muted: var(--chocolate-80); /* secondary text */
  --line: #d4d4d4;      /* dividers, light borders */
  --fill: #f2f2f2;      /* boxes, cards, panels */
  --fill-strong: #dcdcdc; /* emphasised boxes (current step, CTA areas) */

  /* Project tones. Each case study is themed by its tone (see "Project themes" at the end). */
  --tone-1: var(--mint-100);       /* Multi-Brand Design System */
  --tone-2: var(--strawberry-80);  /* Dealer Pricing Insights */
  --tone-3: var(--blueberry-80);   /* Selling Cars Across Europe */

  /* Type. Instrument Serif for display headings and case study titles; Instrument Sans for everything else.
     Loaded from Google Fonts in each page's <head>. */
  --serif: "Instrument Serif", Georgia, "Times New Roman", serif;
  --sans: "Instrument Sans", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace; /* components page only, for class names */

  --measure: 34rem;
  --gutter: clamp(1rem, 4vw, 3rem);
  --wide: 76rem;
  --radius: 4px;
  --frame: clamp(6px, 1vw, 12px);   /* white frame around the viewport */
  /* Depth for clickable things, mixed from Chocolate 100 */
  --shadow-sm: 0 1px 2px color-mix(in srgb, var(--chocolate-100) 20%, transparent), 0 3px 8px -3px color-mix(in srgb, var(--chocolate-100) 22%, transparent);
  --shadow-img: 0 1px 2px color-mix(in srgb, var(--chocolate-100) 10%, transparent), 0 10px 28px -14px color-mix(in srgb, var(--chocolate-100) 32%, transparent);
  --shadow-md: 0 2px 4px color-mix(in srgb, var(--chocolate-100) 18%, transparent), 0 10px 22px -10px color-mix(in srgb, var(--chocolate-100) 35%, transparent);
  --nav-space: 5rem;                /* clearance under the sticky glass bar for #section jumps */
  --header-flow: 3.56rem;           /* height the glass nav takes up at the top of the page */
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
}

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

/* White frame around the whole viewport, drawn over the page */
body::after {
  content: ""; position: fixed; inset: 0; z-index: 40; pointer-events: none;
  border: var(--frame) solid #ffffff;
}

a { color: inherit; text-underline-offset: 0.18em; }

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

.skip {
  position: absolute; left: -999px; top: 0.5rem; z-index: 50;
  background: var(--fg); color: var(--bg); padding: 0.5rem 0.9rem;
}
.skip:focus { left: 0.5rem; }

.wrap { max-width: var(--wide); margin: 0 auto; padding: 0 var(--gutter); }

/* ---------- Type scale ---------- */

h1, h2, h3 { font-family: var(--sans); font-weight: 700; line-height: 1.1; margin: 0; }
.display { font-family: var(--serif); font-weight: 400; letter-spacing: -0.01em; line-height: 1; font-size: clamp(2.8rem, 1.6rem + 5.4vw, 6rem); }
/* h2, h3 and .pull use the display serif (single regular weight, sized up a touch as it runs narrow) */
h2, .h2, h3, .h3 { font-family: var(--serif); font-weight: 400; line-height: 1.05; }
h2, .h2  { font-size: clamp(2.1rem, 1.6rem + 2.4vw, 3.6rem); }
h3, .h3  { font-size: clamp(1.45rem, 1.25rem + 0.8vw, 1.9rem); line-height: 1.1; }

p { margin: 0 0 1em; max-width: var(--measure); }
.lede { font-size: clamp(1.15rem, 1.05rem + 0.5vw, 1.4rem); line-height: 1.45; max-width: 36rem; }

.typed { font-family: var(--sans); font-size: 0.8rem; line-height: 1.55; }

/* ---------- Glass nav bar: site nav on the left, in-page (chapter) nav on the right ---------- */

.site-header {
  position: sticky; top: calc(var(--frame) + 0.6rem); z-index: 20;
  padding: 0.6rem var(--gutter) 0;
  pointer-events: none; /* only the bar itself is clickable */
}
/* The bar only lays out two separate glass pills: site nav (left) and chapters (right) */
.bar {
  max-width: var(--wide); margin: 0 auto;
  display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: space-between; gap: 0.5rem 1rem;
}
.bar > .nav, .bar > .chapters {
  pointer-events: auto;
  padding: 0.3rem;
  border-radius: 0.9rem;
  background: color-mix(in srgb, var(--vanilla-20) 62%, transparent);
  -webkit-backdrop-filter: blur(16px) saturate(1.6);
  backdrop-filter: blur(16px) saturate(1.6);
  border: 1px solid color-mix(in srgb, var(--chocolate-40) 85%, transparent);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.65),
    0 10px 30px -14px color-mix(in srgb, var(--chocolate-100) 35%, transparent);
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .bar > .nav, .bar > .chapters { background: color-mix(in srgb, var(--vanilla-20) 94%, transparent); }
}

.nav, .chapters ol { display: flex; align-items: center; gap: 0.4rem; }
.nav a, .nav summary, .chapters a {
  display: block; white-space: nowrap; cursor: pointer;
  font-size: 0.975rem; line-height: 1.4; color: var(--chocolate-100); text-decoration: none;
  padding: 0.45rem 0.8rem; border-radius: 0.6rem;
  transition: background-color 0.15s, color 0.15s;
}
.nav a:hover, .nav summary:hover, .chapters a:hover { background: color-mix(in srgb, var(--chocolate-40) 70%, transparent); }
.nav a[aria-current="page"], .work-menu.current summary { background: color-mix(in srgb, var(--chocolate-40) 90%, transparent); font-weight: 600; }

.chapters { min-width: 0; }
.chapters ol { list-style: none; margin: 0; padding: 0; overflow-x: auto; scrollbar-width: none; }
.chapters ol::-webkit-scrollbar { display: none; }
.chapters a { color: var(--chocolate-80); }
.chapters a.active { background: var(--project-tint, var(--fill)); color: var(--project, var(--fg)); font-weight: 600; }

@media (max-width: 52rem) {
  :root { --nav-space: 8.5rem; --header-flow: 7.06rem; } /* two pills stacked here */
  /* the chapters pill drops below the site nav, full width, and scrolls sideways */
  .bar > .chapters { flex: 1 1 100%; }
}

.work-menu { position: relative; }
.work-menu summary { list-style: none; display: flex; align-items: center; gap: 0.35rem; }
.work-menu summary::-webkit-details-marker { display: none; }
.work-menu summary::after { content: "▾"; font-size: 1.05em; line-height: 1; }
.work-menu[open] summary::after { content: "▴"; }
.work-menu ul {
  position: absolute; left: 0; top: calc(100% + 0.6rem); z-index: 2;
  list-style: none; margin: 0; padding: 0.3rem;
  width: max-content; max-width: calc(100vw - 2rem);
  border-radius: 0.9rem;
  background: color-mix(in srgb, var(--vanilla-20) 95%, transparent);
  -webkit-backdrop-filter: blur(16px) saturate(1.6);
  backdrop-filter: blur(16px) saturate(1.6);
  border: 1px solid color-mix(in srgb, var(--chocolate-40) 85%, transparent);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65), 0 10px 30px -14px color-mix(in srgb, var(--chocolate-100) 35%, transparent);
}
.work-menu li a {
  display: grid; grid-template-columns: 0.75rem 1fr; gap: 0.6rem; align-items: center;
  font-size: 0.9rem; padding: 0.55rem 0.75rem;
}
.work-menu li a[aria-current="page"] { font-weight: 600; }
.work-menu li a:hover { background: color-mix(in srgb, var(--chocolate-40) 70%, transparent); }
.dot { width: 0.75rem; height: 0.75rem; border-radius: 50%; border: 1px solid var(--fg); background: var(--fill); }

.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font: inherit; font-size: 16px; font-weight: 700; line-height: 1.2;
  background: var(--chocolate-80); color: var(--bg);
  border: 1px solid var(--chocolate-80); border-radius: var(--radius);
  padding: 0.7rem 1.2rem; text-decoration: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18), var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18), var(--shadow-md); }
.btn:active { transform: translateY(1px); box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.2); }
.btn.small { padding: 0.45rem 0.85rem; }
.btn.ghost { background: var(--bg); color: var(--fg); }


/* ---------- Info card (key/value panel) ---------- */

.card {
  --margin: 4.2rem;
  position: relative;
  background: var(--fill);
  border: 1px solid var(--fg);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem 1.4rem;
}
.card .card-top {
  display: flex; justify-content: space-between; gap: 1rem;
  font-family: var(--sans); font-size: 0.75rem; color: var(--muted);
  padding-bottom: 0.6rem; margin-bottom: 0.6rem; border-bottom: 1px solid var(--line);
}
.card dl { margin: 0; font-size: 0.9rem; line-height: 1.7; }
.card dl div { display: grid; grid-template-columns: calc(var(--margin) - 0.5rem) 1fr; gap: 0.75rem; }
.card dt { color: var(--muted); }
.card dd { margin: 0; }

/* Label badge (was a rubber stamp) */
.stamp {
  position: absolute;
  font-family: var(--sans); font-size: 0.72rem; line-height: 1.25; text-align: center;
  color: var(--muted); border: 1px dashed var(--muted); border-radius: var(--radius);
  padding: 0.3rem 0.55rem; background: var(--bg);
}

/* ---------- Hero ---------- */

.hero { padding: clamp(3rem, 8vw, 6rem) 0 clamp(3rem, 7vw, 5rem); }
.hero .wrap {
  display: grid; gap: clamp(2.5rem, 5vw, 4rem);
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  align-items: center;
}
.hero h1 { margin-bottom: 1.5rem; }
.hero .lede { margin-bottom: 2rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; align-items: center; }
.hero-actions .textlink { font-size: 0.9rem; }
.textlink { color: var(--chocolate-80); }
.hero .card { max-width: 26rem; justify-self: end; width: 100%; padding-bottom: 3.75rem; --margin: 4.9rem; }
.hero .stamp { right: 1.2rem; bottom: 1rem; }
.hero.solo .wrap { grid-template-columns: 1fr; }
.hero.solo h1 { max-width: 16ch; }

/* ---------- Home: intro (type-led hero with a signature stamp) ---------- */

.intro { padding: clamp(2.5rem, 7vw, 5.5rem) 0 clamp(3rem, 6vw, 4.5rem); }
.intro-grid {
  display: grid; grid-template-columns: minmax(0, 1fr) auto;
  gap: 2rem clamp(2rem, 5vw, 5rem); align-items: center;
}
.intro-kicker { font-size: 16px; font-weight: 700; letter-spacing: 1px; color: var(--chocolate-80); margin: 0 0 1.25rem; }
.intro h1 { font-size: clamp(3.2rem, 1.6rem + 6.6vw, 8rem); line-height: 0.95; max-width: 13ch; margin-bottom: 1.75rem; }
.intro h1 em { font-style: italic; color: var(--chocolate-80); }
.intro .lede { margin-bottom: 2rem; }
.intro .intro-stamp { width: clamp(12rem, 24vw, 21rem); transform: rotate(-8deg); align-self: start; margin-top: clamp(2rem, 6vw, 5rem); }
/* Standalone holding page: the intro alone, filling the screen, footer at the bottom */
body:has(> .home-solo) { min-height: 100vh; min-height: 100dvh; display: flex; flex-direction: column; }
.home-solo { flex: 1; display: flex; flex-direction: column; justify-content: center; }
.intro-facts {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem 2rem;
  margin: clamp(2.5rem, 6vw, 4rem) 0 0; padding-block: 1.25rem; border-block: 1px solid var(--chocolate-40);
}
.intro-facts dt { font-size: 0.8rem; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--strawberry-80); }
.intro-facts dd { margin: 0.25rem 0 0; color: var(--chocolate-100); }
@media (max-width: 48rem) {
  .intro-grid { grid-template-columns: 1fr; }
  .intro .intro-stamp { grid-row: 1; justify-self: end; width: 7.5rem; margin: 0 0 -1.5rem; }
  .intro-kicker { margin-bottom: 1rem; }
  .intro-facts { grid-template-columns: 1fr; gap: 0.75rem; }
  .intro-facts div { display: grid; grid-template-columns: 5rem 1fr; align-items: baseline; }
  .intro-facts dd { margin: 0; }
}
@media (prefers-reduced-motion: no-preference) {
  .intro-stamp { animation: stamp-in 0.45s cubic-bezier(0.3, 1.5, 0.5, 1) 0.2s backwards; }
  @keyframes stamp-in { from { opacity: 0; transform: scale(1.25) rotate(-8deg); } }
}


@media (max-width: 56rem) {
  .hero .wrap { grid-template-columns: 1fr; }
  .hero .card { justify-self: start; }
}

/* ---------- Section heads ---------- */

.section { padding: clamp(3.5rem, 8vw, 6rem) 0; }
.section-head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 1rem 2rem; margin-bottom: clamp(2rem, 4vw, 3rem); }
.section-head p { margin: 0; color: var(--muted); max-width: 26rem; }
/* Section labels (e.g. "Selected work") use the chapter-label style */
.section-head h2 { font-family: var(--sans); font-size: 0.8rem; font-weight: 400; line-height: 1.6; color: var(--chocolate-80); text-transform: uppercase; letter-spacing: 0.05em; }

/* ---------- Home: case study cards ---------- */

.shelf { display: grid; gap: clamp(1.5rem, 3vw, 2rem); }

.book {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
  border: 1px solid var(--fg); border-radius: var(--radius); overflow: hidden;
  text-decoration: none; color: var(--fg);
  background: var(--tone, var(--fill));
}
.book { position: relative; box-shadow: var(--shadow-sm); }

/* Hover: the card lifts, the arrow nudges, any cover image zooms */
.book-arrow { display: inline-block; }
.book .shot > img { transition: transform 0.5s ease; }
@media (hover: hover) {
  .book { transition: transform 0.25s ease, box-shadow 0.25s ease; }
  .book-arrow { transition: transform 0.25s ease; }
  .book:is(:hover, :focus-visible) { transform: translateY(-4px); box-shadow: 0 18px 32px -16px color-mix(in srgb, var(--project, var(--fg)) 55%, transparent); }
  .book:is(:hover, :focus-visible) .book-arrow { transform: translateX(0.35rem); }
  .book:is(:hover, :focus-visible) .shot > img { transform: scale(1.04); }
}

.book-text { padding: clamp(1.5rem, 3vw, 2.25rem); display: flex; flex-direction: column; gap: 0.9rem; }
.book-meta { font-family: var(--sans); font-size: 0.78rem; color: var(--muted); }
.book h3 { font-family: var(--serif); font-weight: 400; line-height: 1.05; font-size: clamp(2rem, 1.6rem + 1.8vw, 3.2rem); }
.book p { margin: 0; line-height: 1.45; }
.book-cta { margin-top: auto; padding-top: 1rem; font-size: 0.9rem; font-weight: 600; }
.book .shot { border: 0; box-shadow: none; border-radius: 0; min-height: 18rem; aspect-ratio: auto; height: 100%; }

@media (max-width: 52rem) {
  .book { grid-template-columns: 1fr; }
  .book .shot { min-height: 14rem; aspect-ratio: 16 / 10; }
}

/* ---------- Image frames with built-in placeholder ---------- */
/* Drop a file at the src path and it covers the placeholder. */

.shot {
  position: relative; overflow: hidden;
  background: var(--fill);
  border: 0; border-radius: var(--radius);
  box-shadow: var(--shadow-img);
  aspect-ratio: 16 / 10;
  margin: 0;
}
.shot.tall { aspect-ratio: 4 / 5; }
.shot.wide { aspect-ratio: 21 / 9; }
.shot.square { aspect-ratio: 1; }
.shot > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 1; }
.shot.contain > img { object-fit: contain; }
.shot .todo {
  position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: center; gap: 0.5rem;
  padding: 1.25rem 1.5rem;
  font-family: var(--sans); font-size: 0.75rem; line-height: 1.5; color: var(--muted);
  /* the classic wireframe cross */
  background:
    linear-gradient(to top right, transparent calc(50% - 0.5px), var(--line) calc(50% - 0.5px), var(--line) calc(50% + 0.5px), transparent calc(50% + 0.5px)),
    linear-gradient(to bottom right, transparent calc(50% - 0.5px), var(--line) calc(50% - 0.5px), var(--line) calc(50% + 0.5px), transparent calc(50% + 0.5px)),
    var(--fill);
}
.shot .todo > * { background: var(--fill); align-self: flex-start; padding: 0 0.25rem; }
.shot .todo strong { color: var(--fg); font-weight: 600; }
.shot .todo code { font-family: var(--sans); font-size: 0.7rem; word-break: break-all; }

figure { margin: 0; }
figcaption.cap { font-size: 0.8rem; color: var(--muted); margin-top: 0.6rem; max-width: 40rem; }

/* ---------- Home: other work grid ---------- */

/* Dividers above and below, in the same colour and width as the line above the homepage facts
   (confined to the content column rather than running edge to edge) */
.drawer { background: transparent; position: relative; }
.drawer::before, .drawer::after {
  content: ""; position: absolute; height: 1px; background: var(--chocolate-40);
  left: calc(max(0px, (100% - var(--wide)) / 2) + var(--gutter));
  right: calc(max(0px, (100% - var(--wide)) / 2) + var(--gutter));
}
.drawer::before { top: 0; }
.drawer::after { bottom: 0; }
/* Section title at h2 size, in Strawberry 80 */
.drawer .section-head { justify-content: center; text-align: center; }
.drawer .section-head h2 { font-family: var(--serif); font-weight: 400; letter-spacing: 0; text-transform: none; line-height: 1.05; font-size: clamp(2.1rem, 1.6rem + 2.4vw, 3.6rem); color: var(--strawberry-80); }
.drawer .section-head p { color: var(--muted); }
.drawer-grid {
  display: grid; gap: 1.5rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 19rem), 1fr));
}
.drawer .card, .interests .card { background: var(--bg); padding: 1rem 1.25rem 1.25rem; }

/* ---------- Home: areas of expertise roundels ---------- */

.roundel-defs { position: absolute; width: 0; height: 0; overflow: hidden; }
.roundels {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: clamp(1rem, 3vw, 2.5rem);
}
.roundel { display: block; width: clamp(9.5rem, 14vw, 11.5rem); height: auto; color: var(--strawberry-80); }
.roundel text { fill: currentColor; font-family: var(--sans); font-weight: 700; text-anchor: middle; text-transform: uppercase; }
.roundel-arc { font-size: 14px; letter-spacing: 0.1em; }
.roundel-main { font-size: 19px; letter-spacing: 0.04em; }
.roundel-main.long { font-size: 15px; letter-spacing: 0.02em; } /* keeps longer words inside the side brackets */
.roundel-sub { font-size: 10.5px; font-weight: 600; letter-spacing: 0.08em; }
.drawer .card h3, .interests .card h3 { font-size: 1.45rem; line-height: 1.1; margin: 0 0 0.5rem; }
.drawer .card p, .interests .card p { font-size: 0.9rem; line-height: 1.55; margin: 0; }

/* ---------- About: interest cards ---------- */

.interests {
  display: grid; gap: 1.5rem; margin-top: clamp(2rem, 5vw, 3rem);
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 19rem), 1fr));
}

/* ---------- Contact block ---------- */

.contact { background: var(--vanilla-20); }
.contact .wrap { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 2rem 4rem; align-items: center; }
.contact h2 { font-size: clamp(2.2rem, 1.5rem + 3vw, 4rem); }
@media (max-width: 48rem) { .contact .wrap { grid-template-columns: 1fr; } }

.site-footer { padding: 1.5rem 0 2rem; font-size: 0.85rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 0.75rem 2rem; justify-content: space-between; }

/* ==========================================================================
   Case study pages
   ========================================================================== */

/* Pulled up behind the glass bar so the project colour shows through it */
.cs-hero { background: var(--tone, var(--fill)); border-bottom: 1px solid var(--fg); margin-top: calc(-1 * var(--header-flow)); padding: calc(var(--header-flow) + clamp(2.5rem, 6vw, 4.5rem)) 0 0; }
.cs-hero .crumb { font-size: 0.85rem; margin-bottom: 1.5rem; display: inline-block; }
.cs-hero-grid { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 2rem 3rem; align-items: end; }
.cs-hero h1 { margin-bottom: 1.2rem; }
.cs-hero .lede { margin: 0; }
.cs-hero .card { background: var(--bg); max-width: 22rem; justify-self: end; width: 100%; }
.cs-hero .hero-shot { margin-top: clamp(2rem, 5vw, 3rem); margin-bottom: -1px; }
.cs-hero .hero-shot .shot { border-radius: var(--radius) var(--radius) 0 0; aspect-ratio: 16 / 8; }
@media (max-width: 52rem) {
  .cs-hero-grid { grid-template-columns: 1fr; }
  .cs-hero .card { justify-self: start; }
  .cs-hero .hero-shot .shot { aspect-ratio: 4 / 3; }
}


/* Chapters */
.chapter { padding: clamp(3.5rem, 8vw, 6rem) 0; border-bottom: 1px solid var(--line); scroll-margin-top: calc(var(--frame) + var(--nav-space)); }
.chapter:last-of-type { border-bottom: 0; }
.chapter-grid { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.4fr); gap: 2rem clamp(2rem, 5vw, 5rem); }
.chapter-label { font-family: var(--sans); font-size: 0.8rem; color: var(--chocolate-80); margin-bottom: 0.9rem; display: block; text-transform: uppercase; letter-spacing: 0.05em; }
.chapter h2 { margin-bottom: 1rem; }
/* A chapter whose image sits in the narrow left column, under the heading; the text runs alongside */
.chapter-grid.with-fig { grid-template-rows: auto 1fr; }
.chapter-grid.with-fig > .body { grid-column: 2; grid-row: 1 / span 2; }
.chapter-grid.with-fig > .chapter-fig { grid-column: 1; grid-row: 2; align-self: start; }
.chapter .body p:last-child { margin-bottom: 0; }
.chapter .body ul { margin: 0 0 1em; padding-left: 1.1em; max-width: var(--measure); }
.chapter .body li { margin-bottom: 0.45em; padding-left: 0.2em; }
.figs-wrap { margin-top: clamp(2rem, 5vw, 3rem); display: grid; gap: 1.5rem; }
.figs { display: grid; gap: 1.5rem; }
.figs.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 52rem) {
  .chapter-grid, .figs.two { grid-template-columns: 1fr; }
  .chapter-grid.with-fig > .body, .chapter-grid.with-fig > .chapter-fig { grid-column: auto; grid-row: auto; }
}

/* Pull statement */
.pull { font-family: var(--serif); font-size: clamp(2rem, 1.4rem + 2.8vw, 3.6rem); line-height: 1.05; font-weight: 400; max-width: 22ch; margin: 0; }
.pull-wrap { padding: clamp(3rem, 7vw, 5rem) 0; border-bottom: 1px solid var(--line); scroll-margin-top: calc(var(--frame) + var(--nav-space)); }

/* Key decision callout */
.decision { border: 1px solid var(--fg); border-radius: var(--radius); background: var(--fill); padding: 1.1rem 1.25rem; margin: 1.5rem 0; max-width: var(--measure); }
.decision .typed { display: block; color: var(--muted); margin-bottom: 0.35rem; }
.decision p { margin: 0; font-size: 1.1rem; line-height: 1.45; }

/* Big numbers */
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr)); gap: 1.5rem; margin: 0 0 2rem; }
.fact { border-top: 1px solid var(--fg); padding-top: 0.8rem; }
.fact b { display: block; font-size: clamp(2.4rem, 2rem + 2vw, 3.5rem); font-weight: 700; line-height: 1; }
.fact span { font-size: 0.85rem; color: var(--muted); }

/* Next / previous */
/* Previous / next case study: two compact links, each with a circle that carries an arrow on hover */
.pager {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 1.5rem 2rem;
  max-width: var(--wide); margin: 0 auto; padding: clamp(2rem, 5vw, 3.5rem) var(--gutter);
}
.pager a {
  display: grid; align-items: center; column-gap: 0.9rem;
  grid-template-columns: auto auto; grid-template-areas: "dot label" "dot title";
  padding: 0.4rem 0.6rem; border-radius: 0.9rem;
  text-decoration: none; color: var(--chocolate-100);
}
.pager a + a { grid-template-areas: "label dot" "title dot"; text-align: right; }
.pager .typed { grid-area: label; display: block; margin-bottom: 0.15rem; color: var(--muted); }
.pager .h3 { grid-area: title; }
/* the circle: the current case study's colour, switching to the destination's on hover */
.pager a::before {
  content: ""; grid-area: dot; width: 2.75rem; height: 2.75rem; border-radius: 50%;
  background: var(--page-tone, var(--project, var(--fg)));
  box-shadow: 0 2px 6px color-mix(in srgb, var(--chocolate-100) 25%, transparent), inset 0 1px 0 rgba(255, 255, 255, 0.3);
  transition: background-color 0.25s ease, transform 0.25s ease;
}
/* the arrow, always shown; it nudges toward its destination on hover */
.pager a::after {
  content: "←"; grid-area: dot; place-self: center; position: relative; z-index: 1; /* above the scaled circle */
  font-family: var(--sans); font-size: 1.25rem; font-weight: 700; line-height: 1; color: var(--on-project, var(--bg));
  transition: transform 0.25s ease;
}
.pager a + a::after { content: "→"; }
.pager a:is(:hover, :focus-visible)::before { background: var(--project, var(--fg)); transform: scale(1.06); }
.pager a:is(:hover, :focus-visible)::after { transform: translateX(-0.2rem); }
.pager a + a:is(:hover, :focus-visible)::after { transform: translateX(0.2rem); }
@media (max-width: 40rem) {
  .pager { flex-direction: column; align-items: stretch; }
  .pager a { justify-self: start; align-self: flex-start; }
  .pager a + a { align-self: flex-end; }
}

/* ---------- Diagrams (built in HTML, no images needed) ---------- */

.diagram { border: 1px solid var(--fg); border-radius: var(--radius); background: var(--bg); padding: clamp(1.25rem, 3vw, 2rem); }
.diagram-title { font-family: var(--sans); font-size: 0.78rem; color: var(--muted); margin: 0 0 1.25rem; }
/* A diagram without its container: no border, padding or background */
.diagram.bare, [class*="project-"] .diagram.bare { border: 0; padding: 0; background: none; }

.flow { --flow-gap: 2.25rem; list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; align-items: stretch; gap: var(--flow-gap); }
.flow li {
  flex: 1 1 8rem; position: relative;
  border: 1px solid var(--fg); border-radius: var(--radius); background: var(--fill);
  padding: 0.75rem 0.85rem; font-size: 0.95rem; line-height: 1.3;
}
.flow li small { display: block; font-size: 0.75rem; color: var(--muted); margin-top: 0.3rem; }
.flow li.me { background: var(--fill-strong); font-weight: 600; }
/* chevron centred in the gap between steps */
.flow li:not(:last-child)::after {
  content: ""; position: absolute; top: 50%; z-index: 1;
  right: calc(var(--flow-gap) / -2 - 0.3rem);
  width: 0.6rem; height: 0.6rem; border-top: 1.5px solid var(--fg); border-right: 1.5px solid var(--fg);
  transform: translate(-0.15rem, -50%) rotate(45deg);
}
@media (max-width: 40rem) {
  .flow { flex-direction: column; }
  .flow li { flex-basis: auto; } /* stacked steps size to their content */
  .flow { --flow-gap: 1.75rem; }
  .flow li:not(:last-child)::after { right: auto; left: 1.2rem; top: auto; bottom: calc(var(--flow-gap) / -2 - 0.3rem); transform: translateY(-0.15rem) rotate(135deg); }
}

/* Venn */
.venn { display: grid; grid-template-columns: 1fr 1fr; align-items: center; justify-items: center; max-width: 34rem; margin: 0 auto; }
.venn .set {
  width: 100%; aspect-ratio: 1; border-radius: 50%; border: 1px solid var(--fg);
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center;
  font-size: clamp(0.85rem, 0.75rem + 0.4vw, 1rem); line-height: 1.25;
}
.venn .set small { font-size: 0.72rem; color: var(--muted); margin-top: 0.4rem; max-width: 10rem; }
.venn .a { background: rgba(0, 0, 0, 0.04); transform: translateX(12%); padding: 1rem 30% 1rem 8%; }
.venn .b { background: rgba(0, 0, 0, 0.08); transform: translateX(-12%); padding: 1rem 8% 1rem 30%; }
.venn-note { text-align: center; font-size: 0.8rem; color: var(--muted); margin: 1rem auto 0; max-width: 28rem; }

/* Fork */
.fork { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; position: relative; padding-top: 4.5rem; }
.fork .root {
  position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  border: 1px solid var(--fg); border-radius: var(--radius); background: var(--fill);
  padding: 0.5rem 1rem; font-size: 0.85rem; white-space: nowrap;
}
.fork::before {
  content: ""; position: absolute; top: 2.3rem; left: 25%; right: 25%; height: 2.2rem;
  border: 1px solid var(--fg); border-bottom: 0;
}
.fork .branch { border: 1px solid var(--fg); border-radius: var(--radius); padding: 1rem 1.1rem; background: var(--bg); }
.fork .branch .typed { display: block; color: var(--muted); margin-bottom: 0.3rem; }
.fork .branch p { margin: 0; line-height: 1.35; }
.fork .branch.rec { background: var(--fill); }
.fork .branch.shipped { background: var(--fill-strong); }
.fork .branch.rec .later { display: inline-block; margin-top: 0.7rem; font-size: 0.72rem; border: 1px dashed var(--muted); border-radius: var(--radius); padding: 0.15rem 0.5rem; }

/* Funnel */
.funnel { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.4rem; justify-items: center; }
.funnel li {
  border: 1px solid var(--fg); border-radius: var(--radius); background: var(--fill);
  padding: 0.6rem 1rem; text-align: center; font-size: 0.95rem; line-height: 1.25;
}
.funnel li:nth-child(1) { width: 100%; }
.funnel li:nth-child(2) { width: 88%; }
.funnel li:nth-child(3) { width: 74%; }
.funnel li:nth-child(4) { width: 30%; min-width: 11rem; background: var(--fill-strong); }
.funnel li small { display: block; font-size: 0.72rem; color: var(--muted); }

/* Hub and spoke */
.hub { display: grid; grid-template-columns: 1fr auto 1fr; gap: 0.75rem; align-items: center; }
.hub .side { display: grid; gap: 0.6rem; }
.hub .node { border: 1px solid var(--fg); border-radius: var(--radius); background: var(--fill); padding: 0.6rem 0.8rem; font-size: 0.95rem; line-height: 1.25; }
.hub .gate { width: 9rem; aspect-ratio: 1; border-radius: 50%; background: var(--fill-strong); border: 1px solid var(--fg); display: flex; align-items: center; justify-content: center; text-align: center; padding: 1rem; font-size: 0.95rem; line-height: 1.2; }
.hub .gate small { display: block; font-size: 0.7rem; color: var(--muted); margin-top: 0.3rem; }
.hub .out { background: var(--fill-strong); font-weight: 600; }
@media (max-width: 40rem) { .hub { grid-template-columns: 1fr; justify-items: stretch; } .hub .gate { margin: 0 auto; } }

/* ==========================================================================
   Project themes
   .project-1/2/3 sets --project to that case study's tone. It sits on each
   case study's <body> (theming the whole page) and on the homepage cards,
   Work-menu dots and pager links.
   ========================================================================== */

/* Case study pages keep neutral text; the chocolate defaults apply everywhere else */
body.project-1, body.project-2, body.project-3 { --fg: #111111; --muted: #666666; }
/* the current case study's colour, kept even inside links that set --project to another study */
body.project-1 { --page-tone: var(--tone-1); } body.project-2 { --page-tone: var(--tone-2); } body.project-3 { --page-tone: var(--tone-3); }

.project-1 { --project: var(--tone-1); }
.project-2 { --project: var(--tone-2); }
.project-3 { --project: var(--tone-3); }
.project-1, .project-2, .project-3 {
  --project-tint: color-mix(in srgb, var(--project) 8%, var(--bg));   /* soft surfaces */
  --project-soft: color-mix(in srgb, var(--project) 20%, var(--bg));  /* stronger fills */
  --on-project: var(--bg);                                            /* text on --project */
}
/* Mint has its own light shades, so the design system case study uses them instead of mixed tints */
.project-1 { --project-tint: var(--mint-20); --project-soft: var(--mint-40); }

/* Dots, homepage cards, pager */
.dot[class*="project-"] { background: var(--project); border-color: var(--project); }
.book[class*="project-"] { background: var(--project); border-color: var(--project); color: var(--on-project); }

/* Case study hero */
.cs-hero[class*="project-"] { background: var(--project); border-bottom-color: var(--project); color: var(--on-project); }
.cs-hero[class*="project-"] .card { color: var(--chocolate-100); border-color: var(--project); }
/* An image shown at its own proportions (no cropping at any width); set --ar inline, e.g. style="--ar: 2000 / 932" */
.shot.natural, .cs-hero .hero-shot .shot.natural { aspect-ratio: var(--ar, 16 / 10); background: #ffffff; }

/* Everything inside a themed case study page */
[class*="project-"] .work-menu.current summary { background: var(--project-tint); color: var(--project); }
[class*="project-"] .chapter .body li::marker { color: var(--project); }
[class*="project-"] .pull { color: var(--project); }
[class*="project-"] .btn { background: var(--project); border-color: var(--project); color: var(--on-project); }
/* "Want the full story?" matches the case study hero; its button flips to Vanilla */
[class*="project-"] .contact { background: var(--project); color: var(--on-project); }
[class*="project-"] .contact .btn { background: var(--on-project); border-color: var(--on-project); color: var(--project); }
[class*="project-"] .decision { background: var(--project-tint); border-color: var(--project); }
[class*="project-"] .decision .typed { color: var(--project); }
[class*="project-"] .fact { border-top-color: var(--project); }
[class*="project-"] .fact b { color: var(--project); }

/* Diagrams: tinted nodes, the key step in full project colour */
[class*="project-"] .diagram { border-color: var(--project-soft); }
[class*="project-"] .diagram-title { color: var(--project); }
[class*="project-"] :is(.flow li, .hub .node, .funnel li, .fork .branch, .fork .root) { background: var(--project-tint); border-color: var(--project); }
[class*="project-"] :is(.flow li.me, .hub .gate, .hub .out, .funnel li:nth-child(4), .fork .branch.shipped) { background: var(--project); color: var(--on-project); }
[class*="project-"] :is(.flow li.me, .hub .gate, .funnel li:nth-child(4), .fork .branch.shipped) :is(small, .typed) { color: inherit; opacity: 0.85; }
[class*="project-"] .flow li:not(:last-child)::after { border-color: var(--project); }
[class*="project-"] .fork::before { border-color: var(--project); }
[class*="project-"] .fork .branch.rec .later { border-color: var(--project); color: var(--project); }
[class*="project-"] .venn .set { border-color: var(--project); }
[class*="project-"] .venn .a { background: var(--project-tint); }
[class*="project-"] .venn .b { background: var(--project-soft); }

/* ---------- Brand switcher: one image per brand, picked with a segmented control ---------- */
.brand-switch { margin: 0; min-width: 0; }
.brand-switch + .brand-switch { margin-top: clamp(1.5rem, 4vw, 2.5rem); }
.brand-switch-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.75rem 1.5rem; margin-bottom: 1rem; }
.brand-switch-title { margin: 0; font-size: 16px; font-weight: 700; letter-spacing: 1px; color: var(--chocolate-80); }
.brand-tabs {
  display: flex; gap: 0.25rem; max-width: 100%; overflow-x: auto; scrollbar-width: none;
  padding: 0.3rem; border-radius: 0.9rem;
  background: color-mix(in srgb, var(--vanilla-20) 62%, transparent);
  border: 1px solid color-mix(in srgb, var(--chocolate-40) 85%, transparent);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65);
}
.brand-tabs::-webkit-scrollbar { display: none; }
.brand-tabs button {
  flex: none; font: inherit; font-size: 0.9rem; line-height: 1.4; white-space: nowrap; cursor: pointer;
  color: var(--chocolate-80); background: none; border: 0; padding: 0.4rem 0.75rem; border-radius: 0.6rem;
  transition: background-color 0.15s, color 0.15s;
}
.brand-tabs button:hover { background: color-mix(in srgb, var(--chocolate-40) 70%, transparent); color: var(--chocolate-100); }
.brand-tabs button[aria-selected="true"] { background: var(--project-tint, var(--fill)); color: var(--project, var(--fg)); font-weight: 600; }
.brand-tabs button:focus-visible { outline: 2px solid var(--project, var(--fg)); outline-offset: 1px; }
/* panels stack in one cell so switching never changes the height */
.brand-panels { display: grid; }
.brand-panel { grid-area: 1 / 1; opacity: 0; visibility: hidden; transition: opacity 0.25s ease, visibility 0s linear 0.25s; }
.brand-panel.is-active { opacity: 1; visibility: visible; transition: opacity 0.25s ease; }
@media (prefers-reduced-motion: reduce) { .brand-panel, .brand-panel.is-active { transition: none; } }