/* Erik Mischiatti portfolio, C3-v2 Material Engineering. Built from src/_includes/css/*.css. */
@layer tokens, base, components, layouts;
/* Tokens. Values from the approved C3-v2 prototype (DESIGN.md §B), with the §K consolidations:
   --t-h2, --t-title, --t-item, --row, --row-tight, --gap-media and --paper are new names for
   values that were literals in the prototype. */
@layer tokens {
  :root {
    --bg: #e3e2de;
    --plate: #f3f2ef;
    --paper: #fff;
    --ink: #131313;
    --ink-2: #393835;   /* 9.04:1 on --bg */
    --ink-3: #55534e;   /* 5.93:1 on --bg, 6.86:1 on --plate */
    --rule: #b7b4ac;
    --signal: #f2c200;  /* never text; a fill behind --ink (11.05:1) or the focus halo */

    --font: "Archivo", "Roboto", "Liberation Sans", system-ui, sans-serif;

    --t-label: 0.75rem;                                    /* 12 px labels, column heads */
    --t-small: 0.8125rem;                                  /* 13 px captions, metadata, tables */
    --t-body: 1rem;                                        /* 16 px running text */
    --t-item: 1.0625rem;                                   /* 17 px list item titles, main action (K-07) */
    --t-lede: clamp(1.0625rem, 0.98rem + 0.35vw, 1.25rem); /* 17-20 px standfirst */
    --t-h2: clamp(1.375rem, 1.1rem + 0.9vw, 1.875rem);     /* 22-30 px section and secondary titles (K-03) */
    --t-h3: clamp(1.625rem, 1.15rem + 1.6vw, 2.5rem);      /* 26-40 px unit titles */
    --t-display: clamp(2rem, 1.4rem + 1.9vw, 3.125rem);    /* 32-50 px homepage statement */
    --t-title: clamp(2.75rem, 1.4rem + 4.4vw, 5.25rem);    /* 44-84 px case-study title (K-04) */

    /* three widths (K-06) */
    --w-display: 80%;
    --w-item: 88%;

    --measure: 64ch;
    --gutter: 20px;
    --margin: clamp(16px, 3vw, 40px);
    --max: 1400px;
    --s1: 6px;
    --s2: 12px;
    --s3: 20px;
    --s4: 32px;
    --s5: 56px;
    --s6: clamp(72px, 8vw, 120px);
    --row: 9px;        /* rows in lists and tables (K-08) */
    --row-tight: 8px;  /* metadata rows */
    --gap-media: 8px;  /* between images (K-09) */
    --col-head: 10rem; /* first column of status and wide tables (K-12) */
  }

  @media (max-width: 600px) {
    :root { --gutter: 12px; --margin: 16px; --gap-media: 4px; }
  }
}

@layer base {
  @font-face {
    font-family: "Archivo";
    font-style: normal;
    font-weight: 400 800;
    font-stretch: 75% 100%;
    font-display: swap;
    src: url("/static/fonts/archivo-latin-var.woff2") format("woff2");
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
  }

  *, *::before, *::after { box-sizing: border-box; }
  html { -webkit-text-size-adjust: 100%; }
  @media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
  body { margin: 0; background: var(--bg); color: var(--ink); font: 400 var(--t-body)/1.55 var(--font); font-variant-numeric: tabular-nums; }
  img, video, svg { display: block; max-width: 100%; }
  img { height: auto; }
  h1, h2, h3, h4, p, ol, ul, dl, dd, figure, blockquote { margin: 0; }
  ol, ul { list-style: none; padding: 0; }
  strong, b { font-weight: 650; }
  code { font-family: inherit; font-size: inherit; }

  a { color: var(--ink); text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
  a:hover { text-decoration-thickness: 3px; }
  :focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; box-shadow: 0 0 0 7px var(--signal); }
  [id] { scroll-margin-top: 16px; }

  .vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  .skip { position: absolute; left: -999px; }
  .skip:focus { left: var(--margin); top: 12px; z-index: 2; background: var(--signal); color: var(--ink); padding: 10px 14px; }

  .wrap { max-width: var(--max); margin-inline: auto; padding-inline: var(--margin); }
  .grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); }

  /* The one label style (K-14) */
  .label { font-size: var(--t-label); font-weight: 600; color: var(--ink-3); line-height: 1.3; font-stretch: 100%; }
}

/* Shared components (DESIGN.md §E.1). One place per component; variants as modifiers. */
@layer components {

  /* E.1.4 Evidence marks and the gap marker. A gap is always an inline span (K-22). */
  .gap { color: var(--ink-3); }
  .gap::before {
    content: ""; display: inline-block; width: 0.55em; height: 0.55em; margin-right: 0.45em;
    border: 1.5px solid currentColor; vertical-align: 0.05em;
  }
  .mk { display: inline-block; width: 0.7em; height: 0.7em; vertical-align: -0.02em; }
  .mk--doc { background: var(--ink); }
  .mk--rep { border: 1.5px solid var(--ink); }
  .meta { font-size: var(--t-small); color: var(--ink-3); line-height: 1.45; }
  .meta span + span::before { content: " · "; }

  /* E.1.1 Header and primary navigation */
  .top { border-bottom: 3px solid var(--ink); }
  .top__inner { display: flex; justify-content: space-between; align-items: center; gap: var(--s3); min-height: 60px; }
  .wordmark { font-weight: 760; font-stretch: var(--w-display); font-size: 1.25rem; letter-spacing: -0.01em; text-decoration: none; }
  .wordmark:hover { text-decoration: none; }
  .nav { display: flex; gap: 2px; }
  .nav a { display: flex; align-items: center; min-height: 44px; padding: 0 12px; font-weight: 600; font-size: 0.9375rem; text-decoration: none; }
  .nav a:hover { text-decoration: underline; text-decoration-thickness: 3px; }
  .nav a[aria-current] { background: var(--signal); box-shadow: inset 0 -3px 0 var(--ink); }
  .menu-btn { display: none; }  /* phone menu toggle: shown only at ≤ 600 px, once the header script has run (.top--menu) */

  /* E.1.3 Small section head (K-01: one component for every homepage section label) */
  .sec-head { display: flex; justify-content: space-between; align-items: baseline; gap: var(--s3); flex-wrap: wrap; border-top: 3px solid var(--ink); padding-top: var(--s2); margin-bottom: var(--s2); }
  .sec-head h2 { font-size: var(--t-small); font-weight: 720; }
  .sec-head p { font-size: var(--t-small); color: var(--ink-3); max-width: 60ch; }
  .sec-head--spaced { margin-bottom: var(--s4); }

  /* E.1.8 Figures and plates. Captions: 6 px under images, 12 px inside plates (K-13). */
  figcaption { font-size: var(--t-small); color: var(--ink-3); line-height: 1.4; padding-top: var(--s1); }
  figcaption b { font-weight: 650; color: var(--ink); }
  .plate { background: var(--plate); }
  .plate img { mix-blend-mode: multiply; }
  .plate > figcaption, figure.plate figcaption { padding-top: var(--s2); }
  .fig { margin-block: var(--s4); }
  .fig img, .fig video { width: 100%; }
  .fig--plate { padding: var(--s3) var(--s3) var(--s2); }
  .fig--plate img { margin-inline: auto; }
  .fig-row { display: grid; gap: var(--gap-media); margin-block: var(--s4); }
  .fig-row--3 { grid-template-columns: 4fr 3fr 2.4fr; }
  .fig-row--2 { grid-template-columns: 1fr 1fr; }
  .fig-row img { width: 100%; height: clamp(200px, 20vw, 300px); object-fit: cover; }
  /* Photo rows (fig-row--2/3, not contain or video): one shared height, each photo at its own
     proportions (--ar on each figure, set by the build), so nothing is cropped. */
  .fig-row:is(.fig-row--2, .fig-row--3):not(.fig-row--contain, .fig-row--videos) { display: flex; flex-wrap: wrap; align-items: flex-start; }
  .fig-row:is(.fig-row--2, .fig-row--3):not(.fig-row--contain, .fig-row--videos) > figure { flex: var(--ar) 1 0; min-width: 0; }
  .fig-row:is(.fig-row--2, .fig-row--3):not(.fig-row--contain, .fig-row--videos) img { height: auto; aspect-ratio: var(--ar); }
  .fig-row--contain { align-items: start; }
  .fig-row--contain img { object-fit: contain; height: auto; aspect-ratio: auto; }
  .fig-row--contain figure { min-width: 0; }
  .video { background: var(--ink); }
  .fig video, .fig-row--videos video { width: 100%; height: auto; aspect-ratio: var(--ratio, 16 / 9); background: var(--ink); object-fit: contain; }
  .fig-row--videos { align-items: start; }
  .embed { aspect-ratio: 16 / 9; background: var(--ink); }  /* youtube block: responsive 16:9 frame */
  .embed iframe { display: block; width: 100%; height: 100%; border: 0; }

  /* E.1.5 Main action and page link. The arrow is not announced (K-17). */
  .go { align-self: flex-start; justify-self: start; display: inline-flex; align-items: center; gap: 10px; min-height: 44px; padding: 0 14px 0 0; font-weight: 680; font-stretch: var(--w-item); font-size: var(--t-item); text-decoration: none; border-bottom: 3px solid var(--ink); }
  .go::after { content: "→"; content: "→" / ""; font-stretch: 100%; } /* fallback first: older engines drop the alt-text form */
  .go--case:hover, .go--case:focus-visible { background: var(--signal); padding-left: 10px; margin-left: -10px; text-decoration: none; }
  .go--page { font-size: var(--t-body); border-bottom-width: 1px; }
  .go--page:hover { border-bottom-width: 3px; }

  /* E.1.6 Account list */
  .acct { border-top: 1px solid var(--ink); font-size: var(--t-small); line-height: 1.5; }
  .acct > div { display: grid; grid-template-columns: 7.5rem 1fr; gap: var(--s2); padding-block: var(--row); border-bottom: 1px solid var(--rule); }
  .acct dt { font-weight: 650; }
  .acct dd { color: var(--ink-2); }
  .acct dd strong { color: var(--ink); }

  /* E.1.7 Sequence strip */
  .phases { padding: var(--s3) var(--s3) var(--s2); }
  .seq { display: grid; grid-template-columns: repeat(var(--steps, 7), minmax(0, 1fr)); counter-reset: s; border-top: 3px solid var(--ink); }
  .seq li { counter-increment: s; padding: 10px 8px 12px 0; font-weight: 680; font-stretch: var(--w-item); font-size: var(--t-item); line-height: 1.15; }
  .seq li + li { border-left: 1px solid var(--rule); padding-left: 10px; }
  .seq li::before { content: counter(s); display: block; font-size: var(--t-label); font-weight: 600; color: var(--ink-3); margin-bottom: 4px; font-stretch: 100%; }
  .seq--roles li span { display: block; margin-top: 4px; font-size: var(--t-small); font-weight: 400; font-stretch: 100%; line-height: 1.3; color: var(--ink-2); }
  .phases figcaption { max-width: 80ch; }

  /* E.1.9 Technical drawings */
  .dg { padding: var(--s4) var(--s4) var(--s3); }
  .dg svg { width: 100%; height: auto; }
  .dg__narrow { display: none; }
  .dg-box rect { fill: var(--paper); stroke: var(--ink); stroke-width: 1.5; }
  .dg-box--ext rect { stroke-dasharray: 5 3; fill: none; }
  .dg-box--subject rect { stroke-width: 3; }
  .dg-label { font: 700 15px var(--font); font-stretch: var(--w-item); fill: var(--ink); text-anchor: middle; }
  .dg-sub { font: 400 12.5px var(--font); fill: var(--ink-2); text-anchor: middle; }
  .dg-note { font: 500 12.5px var(--font); fill: var(--ink-2); }
  .dg-title { font: 700 13px var(--font); fill: var(--ink); }
  .dg-list { font: 400 13.5px var(--font); fill: var(--ink-2); text-anchor: middle; }
  .dg--compact .dg-label { font-size: 16px; }
  .dg--compact .dg-sub, .dg--compact .dg-note { font-size: 13.5px; }
  .dg-power { stroke: var(--ink); stroke-width: 4; fill: none; }
  .dg-flow { stroke: var(--ink); stroke-width: 1.5; fill: none; }
  .dg-data { stroke: var(--ink); stroke-width: 1.5; stroke-dasharray: 6 4; fill: none; }
  .dg-head { fill: var(--ink); }

  /* E.1.10 Data tables */
  .tbl { width: 100%; border-collapse: collapse; font-size: var(--t-small); line-height: 1.45; margin-block: var(--s3); }
  .tbl caption { text-align: left; font-size: var(--t-small); padding-bottom: 8px; color: var(--ink-3); }
  .tbl caption b { color: var(--ink); font-weight: 720; }
  .tbl th, .tbl td { text-align: left; padding: var(--row) 14px var(--row) 0; border-bottom: 1px solid var(--rule); vertical-align: baseline; }
  .tbl thead th { font-size: var(--t-label); font-weight: 600; color: var(--ink-3); border-bottom: 1px solid var(--ink); }
  .tbl tbody th { font-weight: 650; }
  .tbl td { color: var(--ink-2); }
  .tbl--plain tbody th { font-weight: 500; color: var(--ink); }
  .tbl--wide thead th:first-child { width: var(--col-head); }
  .tbl--num td { font-variant-numeric: tabular-nums; }

  /* E.1.11 Status tables */
  .rec-sheet { background: var(--plate); padding: var(--s3) var(--s3) var(--s2); margin-block: var(--s3); }
  .rec-sheet .tbl { margin: 0; }
  .rec-sheet tbody th { width: var(--col-head); }
  .rec-sheet .st { width: var(--col-head); white-space: nowrap; color: var(--ink); font-weight: 600; }
  .rec-sheet .st .mk { margin-right: 6px; }
  .rec-sheet .st--none { color: var(--ink-3); font-weight: 500; }
  .rec-sheet q { font-weight: 600; color: var(--ink); }
  .rec-sheet .src { display: block; font-size: var(--t-label); color: var(--ink-3); margin-top: 2px; }
  .rec-key { display: flex; gap: 4px var(--s3); flex-wrap: wrap; font-size: var(--t-label); color: var(--ink-3); padding-top: var(--s2); }
  .rec-key .mk { margin-right: 6px; }

  /* Link lists and E.1.15 resources */
  .links li { border-bottom: 1px solid var(--rule); }
  .links a { display: flex; align-items: center; min-height: 44px; font-weight: 600; text-decoration: none; }
  .links a:hover { text-decoration: underline; text-decoration-thickness: 3px; }
  .refs a { padding-block: 8px; line-height: 1.35; }
  .refs li.gap { padding-block: 10px; font-size: var(--t-small); }

  /* E.1.16 Next-project navigation */
  .cs-next { border-top: 3px solid var(--ink); padding-top: var(--s2); }
  .cs-next a { display: inline-block; text-decoration: none; font-size: var(--t-h3); font-weight: 720; font-stretch: var(--w-display); line-height: 1.05; }
  .cs-next a:hover { text-decoration: underline; text-decoration-thickness: 3px; }
  .cs-next span { display: block; margin-bottom: 4px; }

  /* E.1.17 Footer */
  .foot { display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--s1) var(--s3); padding-block: var(--s3); border-top: 1px solid var(--rule); font-size: var(--t-label); color: var(--ink-3); }
  .foot a { color: var(--ink-3); }

  /* Preview-only banner (never in production output) */
  .preview-bar { background: var(--ink); color: var(--bg); font-size: var(--t-small); padding: 6px var(--margin); }
  .preview-bar strong { color: var(--signal); }

  @media (max-width: 1100px) {
    .seq { grid-template-columns: repeat(4, minmax(0, 1fr)); row-gap: 10px; }
    .seq li:nth-child(4n + 1) { border-left: 0; padding-left: 0; }
  }

  /* Wide drawings fall below 11 px text under ~860 px: the vertical versions start here
     (DESIGN.md §I.3, permanent requirement). */
  @media (max-width: 860px) {
    .dg__wide { display: none; }
    .dg__narrow { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); gap: var(--s4) var(--gutter); align-items: start; }
    .dg__narrow svg { max-width: 420px; }
  }

  @media (max-width: 600px) {
    .top__inner { flex-direction: column; align-items: stretch; gap: 0; min-height: 0; padding-top: 8px; }
    .wordmark { line-height: 1.2; }
    .nav { display: grid; grid-template-columns: repeat(4, auto); justify-content: space-between; margin-inline: -8px; }  /* 7 items: two rows on phones */
    .nav a { padding: 0 8px; }

    /* Phone menu (header script adds .top--menu; .is-open while expanded). Without JavaScript the
       two-row link grid above stays in place. */
    .top--menu .top__inner { flex-direction: row; flex-wrap: wrap; align-items: center; gap: 0 var(--s2); min-height: 56px; padding-top: 0; }
    .top--menu .menu-btn { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; padding: 0 10px; margin-right: -10px; border: 0; background: none; color: var(--ink); font: inherit; font-weight: 600; font-size: 0.9375rem; cursor: pointer; }
    .menu-btn__icon, .menu-btn__icon::before, .menu-btn__icon::after { display: block; width: 18px; height: 2px; background: currentColor; transition: transform 0.16s ease, background-color 0.16s ease; }
    .menu-btn__icon { position: relative; }
    .menu-btn__icon::before, .menu-btn__icon::after { content: ""; position: absolute; left: 0; }
    .menu-btn__icon::before { top: -6px; }
    .menu-btn__icon::after { top: 6px; }
    .menu-btn[aria-expanded="true"] .menu-btn__icon { background-color: transparent; }
    .menu-btn[aria-expanded="true"] .menu-btn__icon::before { transform: translateY(6px) rotate(45deg); }
    .menu-btn[aria-expanded="true"] .menu-btn__icon::after { transform: translateY(-6px) rotate(-45deg); }
    .top--menu nav { display: none; flex-basis: 100%; }
    .top--menu.is-open nav { display: block; animation: menu-in 0.16s ease-out; }
    .top--menu .nav { display: flex; flex-direction: column; margin-inline: 0; padding-bottom: var(--s1); border-top: 1px solid var(--rule); }
    .top--menu .nav li + li { border-top: 1px solid var(--rule); }
    .top--menu .nav a { min-height: 48px; padding: 0 8px; font-size: 1rem; }

    .acct > div { grid-template-columns: 1fr; gap: 2px; }
    .acct dt { font-size: var(--t-label); color: var(--ink-3); font-weight: 600; }

    .phases { margin-inline: calc(var(--margin) * -1); padding-inline: var(--margin); }
    .seq { grid-template-columns: 1fr; }
    .seq li, .seq li + li { display: grid; grid-template-columns: 1.75rem 1fr; padding: 9px 0; border-left: 0; border-bottom: 1px solid var(--rule); }
    .seq li::before { margin: 0; font-size: var(--t-small); line-height: 1.3; }
    .seq--roles li span { grid-column: 2; margin-top: 0; }

    .fig-row--3, .fig-row--2 { grid-template-columns: 1fr 1fr; margin-inline: calc(var(--margin) * -1); }
    .fig-row--3 figure:first-child { grid-column: 1 / -1; }
    .fig-row:is(.fig-row--2, .fig-row--3):not(.fig-row--contain, .fig-row--videos) > figure:first-child:nth-last-child(n+3) { flex-basis: 100%; }  /* phones, rows of 3+: first photo full width, the others share the next row */
    .fig-row--contain, .fig-row--videos { grid-template-columns: 1fr; }
    .fig-row--contain figure img { height: auto; }
    .fig-row--contain.fig--plate { padding-inline: var(--margin); }
    .fig-row figcaption { padding-inline: var(--margin); }
    .fig--bleed { margin-inline: calc(var(--margin) * -1); }
    .fig--bleed figcaption { padding-inline: var(--margin); }

    .dg { margin-inline: calc(var(--margin) * -1); padding: var(--s3) var(--margin); }
    .dg__narrow svg { max-width: 380px; }

    .tbl--stack thead { display: none; }
    .tbl--stack caption { display: block; }
    .tbl--stack, .tbl--stack tbody, .tbl--stack tr, .tbl--stack th, .tbl--stack td { display: block; width: auto; }
    .tbl--stack tr { padding-block: 10px; border-bottom: 1px solid var(--rule); }
    .tbl--stack th, .tbl--stack td { border: 0; padding: 0; }
    .tbl--stack tbody th { font-size: var(--t-label); color: var(--ink-3); font-weight: 600; }
    .tbl--stack td + td { margin-top: 3px; }
    .tbl--meta-last td:last-child { font-size: var(--t-label); color: var(--ink-3); }
    .tbl--labelled tbody th { font-size: var(--t-body); font-weight: 720; color: var(--ink); }
    .tbl--labelled td[data-label]::before { content: attr(data-label); display: block; margin-top: 8px; font-size: var(--t-label); font-weight: 600; color: var(--ink-3); }
    .tbl--labelled td + td { margin-top: 0; }
    .tbl--labelled td.st--np { display: none; }
    .rec-sheet { margin-inline: calc(var(--margin) * -1); padding-inline: var(--margin); }
    .rec-sheet tbody th, .rec-sheet .st { width: auto; }
  }

  @keyframes menu-in { from { opacity: 0; transform: translateY(-4px); } }
  @media (prefers-reduced-motion: reduce) {
    .top--menu.is-open nav { animation: none; }
    .menu-btn__icon, .menu-btn__icon::before, .menu-btn__icon::after { transition: none; }
  }
}

/* Homepage compositions (DESIGN.md §D.2–D.5, §E.3). */
@layer layouts {

  /* Opening: identity (text), work (photographs), navigation (selected list) */
  .open { padding-block: var(--s4) var(--s5); row-gap: var(--s4);
    grid-template-areas: "text text text text text about about about about about about about"
                         "list list list list list about about about about about about about"; }
  .open__text { grid-area: text; align-self: start; }
  .open__about { grid-area: about; }
  .open__list { grid-area: list; align-self: end; }
  .open h1 { font-size: var(--t-display); font-weight: 720; font-stretch: var(--w-display); line-height: 1.03; letter-spacing: -0.02em; text-wrap: balance; max-width: 21ch; }
  .open__lede { margin-top: var(--s3); font-size: var(--t-lede); color: var(--ink-2); max-width: 42ch; line-height: 1.5; }
  .open__role { margin-top: var(--s3); font-size: var(--t-small); line-height: 1.45; max-width: 46ch; }
  .open__role b { display: block; font-weight: 650; font-size: var(--t-body); }
  .open__list .sec-head { margin-bottom: 0; padding-bottom: var(--s1); }

  .sel li { border-bottom: 1px solid var(--rule); }
  .sel a { display: grid; grid-template-columns: 2.25rem 1fr auto; gap: 8px; align-items: baseline; min-height: 44px; padding-block: var(--row); text-decoration: none; }
  .sel a:hover b { text-decoration: underline; text-decoration-thickness: 3px; text-underline-offset: 0.2em; }
  .sel .n { font-size: var(--t-small); color: var(--ink-3); }
  .sel b { font-weight: 680; font-stretch: var(--w-item); font-size: var(--t-item); }
  .sel .ev-sum { font-size: var(--t-small); color: var(--ink-3); text-align: right; }

  /* Introduction text (src/_data/about.json), beside the title */
  .open__about { align-self: start; display: flex; flex-direction: column; gap: var(--s2); max-width: 62ch; padding-top: var(--s1); font-size: var(--t-lede); line-height: 1.55; color: var(--ink-2); }
  .open__hi { font-size: var(--t-h2); font-weight: 720; font-stretch: var(--w-display); line-height: 1.1; color: var(--ink); }

  /* Featured units. Layout modifiers are named by layout, not by project (K-19). */
  .work { padding-bottom: var(--s5); }
  .unit { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); row-gap: var(--s3); padding-top: var(--s3); margin-bottom: var(--s6); border-top: 3px solid var(--ink); }
  .unit__no { font-size: var(--t-small); font-weight: 600; color: var(--ink-3); }
  .unit__head { display: flex; flex-direction: column; gap: 8px; }  /* replaces the negative margin (K-21) */
  .unit h3 { font-size: var(--t-h3); font-weight: 720; font-stretch: var(--w-display); line-height: 1.02; letter-spacing: -0.015em; text-wrap: balance; }
  .unit h3 a { text-decoration: none; }
  .unit h3 a:hover { text-decoration: underline; text-decoration-thickness: 3px; }
  .unit__body { display: flex; flex-direction: column; gap: var(--s3); min-width: 0; }
  .unit__what { font-size: var(--t-lede); line-height: 1.45; max-width: 46ch; }
  .unit__media { display: grid; gap: var(--gap-media); min-width: 0; align-content: start; }
  .unit__media > figcaption { grid-column: 1 / -1; padding-top: 0; }
  .unit__media picture { min-width: 0; }
  .unit__media img, .unit__media video { width: 100%; }

  .unit--media-start .unit__media { grid-column: 1 / span 7; grid-row: 1 / span 2; grid-template-columns: 1fr 1fr; }  /* equal columns: the portrait photo is not cropped */
  .unit--media-start .unit__media img { height: clamp(300px, 33vw, 500px); object-fit: cover; }
  .unit--media-start .plate img { object-fit: contain; padding: clamp(12px, 2vw, 28px); }
  .unit--media-start .unit__body { grid-column: 9 / span 4; }

  .unit--media-end .unit__body { grid-column: 1 / span 6; grid-row: 1; }
  .unit--media-end .unit__media { grid-column: 8 / span 5; grid-row: 1; }
  .unit--media-end video { height: clamp(280px, 30vw, 440px); background: #0b0a0d; object-fit: contain; }
  /* A single image on a plate (UWB 3D model), at the height of the other homepage images. */
  .unit--media-end .plate img { height: clamp(280px, 30vw, 440px); object-fit: contain; padding: clamp(12px, 2vw, 24px); }

  .unit--text-led .unit__body { grid-column: 1 / span 5; }
  .unit--text-led .acct { grid-column: 7 / span 6; align-self: start; }
  .unit--text-led .phases { grid-column: 1 / -1; }
  .unit--text-led .go { grid-column: 1 / span 6; }

  .unit--secondary { border-top-width: 1px; margin-bottom: var(--s5); }
  .unit--secondary h3 { font-size: var(--t-h2); }
  .unit--secondary .unit__what { font-size: var(--t-body); }
  .unit--secondary .unit__media { grid-column: 1 / span 5; grid-template-columns: 16fr 9fr; }
  .unit--secondary .unit__media img { height: clamp(180px, 17vw, 260px); object-fit: cover; }
  .unit--secondary .unit__body { grid-column: 7 / span 6; }

  /* Evidence index */
  .index { padding-bottom: var(--s6); }
  .ix { width: 100%; border-collapse: collapse; font-size: var(--t-small); line-height: 1.4; }
  .ix th, .ix td { text-align: left; padding: var(--row) 12px var(--row) 0; border-bottom: 1px solid var(--rule); vertical-align: baseline; }
  .ix thead th { font-size: var(--t-label); font-weight: 600; color: var(--ink-3); vertical-align: bottom; border-bottom: 1px solid var(--ink); }
  .ix thead .ev-group { border-bottom: 0; padding-bottom: 2px; text-align: center; color: var(--ink); font-weight: 720; }
  .ix tbody th { font-size: var(--t-body); font-weight: 680; font-stretch: var(--w-item); }
  .ix tbody th a { display: inline-block; padding-block: 4px; margin-block: -4px; text-decoration: none; }
  .ix tbody th a:hover { text-decoration: underline; text-decoration-thickness: 3px; }
  .ix .ev { width: 7.5%; text-align: center; padding-right: 0; }
  .ix thead .ev { padding-inline: 4px; }
  .ix td.ev + td.ev, .ix th.ev + th.ev { border-left: 1px solid var(--rule); }
  .ix .ev__w { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  .ix .ctx { color: var(--ink-2); }
  .ix .per { white-space: nowrap; }
  .ix-hint { display: none; }  /* phone-only scroll hint */
  .ix-scroll { --ix-col-project: 10.5rem; --ix-col-context: 13rem; --ix-col-evidence: 5.25rem; }  /* phone column widths (used at ≤ 600 px) */
  .ix-key { margin-top: var(--s2); font-size: var(--t-small); color: var(--ink-3); display: flex; gap: 4px var(--s3); flex-wrap: wrap; }
  .ix-key .mk { margin-right: 6px; }

  /* Experience and education. Logo size and spacing: --logo-size, --logo-gap. */
  .cv { --logo-size: 52px; --logo-gap: 8px; padding-bottom: var(--s6); row-gap: var(--s5); }
  .cv__col { grid-column: span 6; }
  .cv-entry { display: grid; grid-template-columns: calc(var(--logo-size) * 2 + var(--logo-gap)) minmax(0, 1fr); gap: var(--s3); padding-block: var(--s3); border-bottom: 1px solid var(--rule); }
  .cv-entry__logos { display: flex; gap: var(--logo-gap); align-items: flex-start; }
  .cv-entry__logos img { width: var(--logo-size); height: var(--logo-size); object-fit: contain; }
  .cv-entry__initials { display: grid; place-items: center; width: var(--logo-size); height: var(--logo-size); border: 1px solid var(--ink); font-size: var(--t-label); font-weight: 720; }
  .cv-entry__when { font-size: var(--t-small); color: var(--ink-3); }
  .cv-entry h3 { margin-top: 2px; font-size: var(--t-item); font-weight: 720; font-stretch: var(--w-item); line-height: 1.25; }
  .cv-entry__org { font-size: var(--t-body); }
  .cv-entry__detail { margin-top: 2px; font-size: var(--t-small); color: var(--ink-2); }

  /* Skills: one column per group */
  .skills { padding-bottom: var(--s6); }
  .skills__grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s4) var(--gutter); }
  .skills__group h3 { font-size: var(--t-body); font-weight: 720; font-stretch: var(--w-item); padding-bottom: var(--s1); border-bottom: 1px solid var(--ink); }
  .skills__group li { padding-block: 6px; border-bottom: 1px solid var(--rule); font-size: var(--t-small); color: var(--ink-2); }

  /* Closing: publication, contact */
  .closing { padding-bottom: var(--s5); row-gap: var(--s4); }
  .closing__col { grid-column: span 6; }
  .cite { font-size: var(--t-small); padding-bottom: var(--s2); margin-bottom: var(--s2); border-bottom: 1px solid var(--rule); }
  .cite cite { font-style: normal; font-weight: 650; }
  .mail { font-size: clamp(1.125rem, 0.9rem + 0.8vw, 1.5rem); font-stretch: var(--w-item); }

  @media (max-width: 1100px) {
    .open { grid-template-areas: "text text text text text text text text list list list list"
                                 "about about about about about about about about about about about about"; }
    .open__list { align-self: start; }
    .open h1 { max-width: 20ch; }

    .unit--media-start .unit__body { grid-column: 8 / span 5; }
    .unit--media-end .unit__body { grid-column: 1 / span 6; }
    .unit--media-end .unit__media { grid-column: 8 / span 5; }
    .unit--text-led .unit__body { grid-column: 1 / span 6; }
    .unit--secondary .unit__media { grid-column: 1 / span 6; }

    .ix .ctx { display: none; }
    .skills__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  }

  @media (max-width: 860px) {
    .open { grid-template-columns: minmax(0, 1fr); grid-template-areas: "text" "about" "list"; }
    .open__list { max-width: 640px; }
    .unit .unit__media, .unit .unit__body, .unit .acct, .unit .phases, .unit .go { grid-column: 1 / -1; grid-row: auto; }
    .unit--media-end .unit__media { order: -1; }
    .unit__what { max-width: none; }
    .unit--media-start .unit__media img { height: clamp(260px, 52vw, 420px); }
    .unit--secondary .unit__media img { height: clamp(160px, 30vw, 240px); }
    .closing__col, .cv__col { grid-column: 1 / -1; }
  }

  @media (max-width: 600px) {
    .cv { --logo-size: 42px; }
    .skills__grid { grid-template-columns: 1fr 1fr; gap: var(--s3) var(--gutter); }
    .open { padding-block: var(--s3) var(--s4); row-gap: var(--s3); }
    .open__lede { font-size: var(--t-item); margin-top: var(--s2); }
    .open__about { font-size: var(--t-body); line-height: 1.5; }  /* phones: the About text one step smaller than the lede */
    .sel a { grid-template-columns: 2rem 1fr; }
    .sel .ev-sum { grid-column: 2; text-align: left; margin-top: -4px; }

    .unit { margin-bottom: var(--s5); }
    .unit__media { margin-inline: calc(var(--margin) * -1); }
    .unit__media figcaption { padding-inline: var(--margin); }
    .unit--media-start .unit__media { grid-template-columns: 1fr 1fr; }
    .unit--media-start .unit__media img { height: 240px; }
    .unit--secondary .unit__media img { height: 180px; }

    /* Index on phones: still a table. It scrolls sideways inside .ix-scroll, the Project column stays
       in place (sticky), and soft edge shadows show that more columns are off screen. */
    .ix-hint { display: block; margin-bottom: var(--s1); font-size: var(--t-label); color: var(--ink-3); }
    .ix-scroll { position: relative; overflow-x: auto; overscroll-behavior-x: contain; -webkit-overflow-scrolling: touch; margin-inline: calc(var(--margin) * -1);  /* relative: also clips the visually hidden evidence labels */
      background: linear-gradient(to left, var(--bg) 30%, transparent) right / 40px 100% no-repeat local,
                  radial-gradient(farthest-side at 100% 50%, rgb(19 19 19 / 0.18), transparent) right / 14px 100% no-repeat scroll; }
    .ix-scroll:focus-visible { outline-offset: -3px; }
    .ix { width: max-content; min-width: 100%; }
    .ix .ctx { display: table-cell; }
    .ix th, .ix td { padding-right: 14px; vertical-align: top; }
    .ix tbody th { position: sticky; left: 0; z-index: 1; width: var(--ix-col-project); min-width: var(--ix-col-project); max-width: var(--ix-col-project); background: var(--bg); box-shadow: inset -1px 0 var(--rule); font-size: var(--t-small); }
    .ix thead th:first-child { position: sticky; left: 0; z-index: 2; background: var(--bg); box-shadow: inset -1px 0 var(--rule); }
    .ix tbody th, .ix thead th:first-child { padding-left: var(--margin); }  /* the sticky column sits at the screen edge */
    .ix td.ctx { min-width: var(--ix-col-context); max-width: var(--ix-col-context); }
    .ix .ev { width: var(--ix-col-evidence); min-width: var(--ix-col-evidence); padding-right: 0; }
  }
}

/* Case-study and project-page layout (DESIGN.md §D.6–D.12, §E.1.12–E.1.14, §E.2). */
@layer layouts {
  .cs-head { padding-block: var(--s4); align-items: end; }
  .cs-intro { grid-column: 1 / span 7; display: flex; flex-direction: column; gap: var(--s3); }
  .cs-intro--wide { grid-column: 1 / span 9; }
  .crumb { font-size: var(--t-small); font-weight: 600; }
  .crumb a { display: inline-block; padding-block: 6px; margin-block: -6px; text-decoration: none; }
  .crumb a:hover { text-decoration: underline; }
  .cs-head h1 { font-size: var(--t-title); font-weight: 760; font-stretch: var(--w-display); line-height: 0.95; letter-spacing: -0.025em; text-wrap: balance; }
  .cs-head--project h1 { font-size: clamp(2.5rem, 1.4rem + 3.2vw, 4.25rem); }
  .cs-sum { font-size: var(--t-lede); line-height: 1.45; max-width: 50ch; }
  .cs-why { font-size: var(--t-body); color: var(--ink-2); max-width: var(--measure); }
  .cs-why strong { color: var(--ink); }

  /* E.2.1 Opening figure: photo pair (default) | drawing plate */
  /* Opening photos share one height; each keeps its own proportions (--ar, set by the build), so
     nothing is cropped. A single photo is capped in height instead. */
  .cs-figs { grid-column: 8 / span 5; display: flex; flex-wrap: wrap; align-items: flex-start; gap: var(--gap-media); align-self: start; }
  .cs-fig { flex: var(--ar) 1 0; min-width: 0; }
  .cs-figs img { width: 100%; height: auto; aspect-ratio: var(--ar); object-fit: cover; }
  .cs-figs .plate img { object-fit: contain; padding: 14px; }
  .cs-figs > figcaption { flex: 1 0 100%; }
  .cs-figs--single { --single-h: clamp(320px, 34vw, 520px); }  /* height of a single opening photo */
  .cs-figs--single .cs-fig { flex: 0 1 auto; width: min(100%, calc(var(--single-h) * (var(--ar)))); }
  /* opening.wide: the photos take a full-width row below the intro (larger photos, same layout rules) */
  .cs-figs--wide { grid-column: 1 / -1; }
  .cs-fig__cap { margin-top: var(--s1); font-size: var(--t-small); color: var(--ink-3); }  /* per-photo caption (fig.caption) */
  .cs-figs--drawing { display: block; padding: var(--s3) var(--s3) var(--s2); }
  .cs-figs--drawing svg { width: 100%; height: auto; }

  /* Body: metadata column and narrative */
  .cs-body { padding-bottom: var(--s5); align-items: start; }
  .cs-aside { grid-column: 1 / span 3; position: sticky; top: 16px; display: flex; flex-direction: column; gap: var(--s4); padding-top: var(--s2); border-top: 3px solid var(--ink); }
  .facts > div { padding-block: var(--row-tight); border-bottom: 1px solid var(--rule); font-size: var(--t-small); line-height: 1.45; }
  .facts dd { color: var(--ink); }
  .toc h2 { padding-bottom: 4px; }
  .toc ol { counter-reset: t; border-top: 1px solid var(--ink); }
  .toc li { counter-increment: t; border-bottom: 1px solid var(--rule); }
  .toc a { display: grid; grid-template-columns: 1.5rem 1fr; min-height: 40px; align-items: center; font-size: var(--t-small); font-weight: 600; line-height: 1.25; text-decoration: none; }
  .toc a::before { content: counter(t); color: var(--ink-3); font-weight: 500; }
  .toc a:hover { text-decoration: underline; }

  .cs-main { grid-column: 5 / -1; min-width: 0; }
  .cs-sec { padding-bottom: var(--s5); }
  .cs-sec > h2, .doc h2 { display: grid; grid-template-columns: 2.25rem 1fr; align-items: baseline; font-size: var(--t-h2); font-weight: 720; font-stretch: var(--w-display); line-height: 1.1; border-top: 3px solid var(--ink); padding-top: var(--s2); margin-bottom: var(--s3); }
  .doc h2 { display: block; margin-top: var(--s5); }
  .doc > h2:first-child { margin-top: 0; }
  .cs-sec > h2 .n { font-size: var(--t-small); font-weight: 600; color: var(--ink-3); font-stretch: 100%; }
  .cs-sec h3, .doc h3 { font-size: var(--t-body); font-weight: 720; margin-block: var(--s4) var(--s2); }
  .prose > * + *, .doc > * + * { margin-top: var(--s2); }
  .prose, .doc > p, .doc > ul, .doc > ol, .doc > blockquote { max-width: var(--measure); }
  .prose p, .prose li, .doc p, .doc li { color: var(--ink-2); }
  .prose strong, .doc strong { color: var(--ink); }
  .dash li, .doc ul li { position: relative; padding-left: 1.1rem; }
  .dash li::before, .doc ul li::before { content: "–"; position: absolute; left: 0; color: var(--ink-3); }
  .doc ol { counter-reset: d; }
  .doc ol li { counter-increment: d; position: relative; padding-left: 1.5rem; }
  .doc ol li::before { content: counter(d); position: absolute; left: 0; color: var(--ink-3); font-weight: 600; }
  .note { font-size: var(--t-small); color: var(--ink-3); max-width: var(--measure); }

  .page-links { padding-bottom: var(--s6); }
  .page-links .links { max-width: 640px; }

  .paths { display: grid; grid-template-columns: 1fr 1fr; gap: var(--gutter); margin-top: var(--s4); }
  .paths h3 { margin: 0 0 6px; padding-bottom: 6px; border-bottom: 1px solid var(--ink); font-size: var(--t-small); }
  .steps { counter-reset: s; font-size: var(--t-small); }
  .steps li { counter-increment: s; display: grid; grid-template-columns: 1.5rem 1fr; padding-block: var(--row-tight); border-bottom: 1px solid var(--rule); color: var(--ink-2); }
  .steps li::before { content: counter(s); font-weight: 600; color: var(--ink-3); }
  ul.steps { max-width: 35rem; margin-block: var(--s2) var(--s3); }  /* standalone list block: same width as the text (64ch at body size) */
  .steps strong { color: var(--ink); }

  @media (max-width: 1100px) {
    .cs-intro, .cs-intro--wide { grid-column: 1 / span 7; }
    .cs-head--no-fig .cs-intro { grid-column: 1 / -1; }
    .cs-figs--drawing { max-width: 560px; }
    .cs-aside { grid-column: 1 / -1; position: static; display: grid; grid-template-columns: 2fr 1fr; gap: var(--gutter); margin-bottom: var(--s4); }
    .cs-main { grid-column: 1 / -1; }
  }

  @media (max-width: 860px) {
    .cs-intro, .cs-intro--wide, .cs-figs { grid-column: 1 / -1; }
    .cs-head { row-gap: var(--s4); }
    .cs-figs--drawing { justify-self: start; width: 100%; }
    .cs-aside { grid-template-columns: 1fr; }
    /* Two-column facts and contents for every case study (K-11) */
    .facts { display: grid; grid-template-columns: 1fr 1fr; column-gap: var(--gutter); }
    .facts > .wide { grid-column: 1 / -1; }
    .toc ol { display: grid; grid-template-columns: 1fr 1fr; column-gap: var(--gutter); }
    .toc a { min-height: 44px; }  /* touch widths (K-10) */
  }

  @media (max-width: 600px) {
    .cs-head { padding-top: var(--s3); }
    .cs-figs { margin-inline: calc(var(--margin) * -1); }
    .cs-figs--single { --single-h: 420px; }
    .cs-figs--wide .cs-fig { flex-basis: 100%; }  /* phones: wide opening photos stack */
    .cs-figs .cs-fig__cap { padding-inline: var(--margin); }
    .cs-figs figcaption { padding-inline: var(--margin); }
    .cs-figs--drawing { margin-inline: calc(var(--margin) * -1); padding: var(--s3) var(--margin) var(--s2); max-width: none; width: auto; justify-self: stretch; }
    /* E.2.2 drawing-first phone order */
    .cs-head--drawing .cs-intro { display: contents; }
    .cs-head--drawing .cs-intro > *, .cs-head--drawing .cs-figs { grid-column: 1 / -1; }
    .cs-head--drawing .crumb { order: 1; }
    .cs-head--drawing h1 { order: 2; }
    .cs-head--drawing .cs-sum { order: 3; }
    .cs-head--drawing .cs-figs { order: 4; }
    .cs-head--drawing .cs-why { order: 5; }
    .cs-head--drawing { row-gap: var(--s3); }
    .cs-sec > h2 { grid-template-columns: 1.75rem 1fr; }
    .paths { grid-template-columns: 1fr; }
  }
}