/* ═══════════════════════════════════════════════════════════════
   devpatel35.com — DRAWING SET
   A portfolio drafted rather than designed. Light = vellum,
   dark = cyanotype blueprint. Category is encoded by hatch
   pattern, not by hue — the way a real drawing does it.
   Hand-written. No framework, no CDN scripts, no build step.
   ═══════════════════════════════════════════════════════════════ */

/* ── 1 · stock ──────────────────────────────────────────────── */

:root {
  --paper:   #e9e4d8;
  --paper-2: #e2dccd;
  --paper-3: #d6cfbc;
  --well:    #f0ece2;

  --ink:     #16150f;
  --ink-2:   #504e44;
  --ink-3:   #847f70;
  --rule:    #b4ad9a;
  --rule-2:  #918a76;

  --red:     #b8301a;
  --red-ink: #fbf7ee;

  --grid:    rgba(22, 21, 15, .04);
  --grid-5:  rgba(22, 21, 15, .085);
  --grain-a: .055;
  --sheet-shadow: 0 1px 0 rgba(255,255,255,.5), 0 2px 3px rgba(22,21,15,.07), 0 24px 60px -40px rgba(22,21,15,.4);

  --sans:   "Archivo", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --narrow: "Archivo Narrow", "Archivo", ui-sans-serif, system-ui, sans-serif;
  --mono:   "Azeret Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --t-xs:   .6875rem;
  --t-sm:   .75rem;
  --t-md:   .8125rem;
  --t-base: clamp(.9375rem, .12vw + .91rem, 1rem);
  --t-lead: clamp(1.0625rem, .4vw + .97rem, 1.1875rem);
  --t-h3:   clamp(1rem, .35vw + .92rem, 1.1875rem);
  --t-h2:   clamp(1.25rem, .9vw + 1.05rem, 1.75rem);
  --t-h1:   clamp(2.1rem, 4.4vw + .9rem, 5rem);

  --gut: clamp(1rem, 3vw, 2.5rem);
  --sec: clamp(2.75rem, 5.5vw, 5rem);
  --max: 1280px;

  --hair: 1px;
  --ease: cubic-bezier(.22, .78, .28, 1);

  color-scheme: light;
}

/* cyanotype — the classic blueprint inversion */
:root[data-theme="dark"] {
  --paper:   #0c2033;
  --paper-2: #102840;
  --paper-3: #16344f;
  --well:    #0a1b2b;

  --ink:     #e4eef7;
  --ink-2:   #9fb8cd;
  --ink-3:   #6d8ba6;
  --rule:    #33546f;
  --rule-2:  #4a6d89;

  --red:     #ff8d5e;
  --red-ink: #0c2033;

  --grid:    rgba(228, 238, 247, .035);
  --grid-5:  rgba(228, 238, 247, .07);
  --grain-a: .05;
  --sheet-shadow: 0 1px 0 rgba(228,238,247,.06), 0 2px 3px rgba(0,0,0,.35), 0 30px 70px -45px rgba(0,0,0,.9);

  color-scheme: dark;
}

/* ── 2 · base ───────────────────────────────────────────────── */

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 5.5rem; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--t-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;              /* never `hidden` — that makes body a scroll container */
  transition: background .45s var(--ease), color .45s var(--ease);
}

img, svg, canvas { display: block; max-width: 100%; }
img { height: auto; }
h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: -.018em; line-height: 1.18; text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }

::selection { background: var(--red); color: var(--red-ink); }
:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }
:focus:not(:focus-visible) { outline: none; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 300;
  background: var(--red); color: var(--red-ink);
  padding: .7rem 1.1rem; font: 600 var(--t-xs)/1 var(--narrow);
  letter-spacing: .14em; text-transform: uppercase;
}
.skip:focus { left: .75rem; top: .75rem; }

.wrap { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--gut); }

/* drafting annotation — the connective tissue of the whole set */
.a {
  font-family: var(--narrow);
  font-size: var(--t-xs);
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.a--ink { color: var(--ink-2); }
.a--red { color: var(--red); }

.num {
  font-family: var(--mono); font-weight: 500;
  font-variant-numeric: tabular-nums; letter-spacing: -.02em;
}

/* ── 3 · the drawing surface ────────────────────────────────── */

/* 5 mm drafting grid with a heavier line every 5 modules */
.grid-bg, .grain {
  position: fixed; inset: 0; pointer-events: none; z-index: -1;
}
.grid-bg {
  background-image:
    linear-gradient(to right,  var(--grid-5) var(--hair), transparent var(--hair)),
    linear-gradient(to bottom, var(--grid-5) var(--hair), transparent var(--hair)),
    linear-gradient(to right,  var(--grid)   var(--hair), transparent var(--hair)),
    linear-gradient(to bottom, var(--grid)   var(--hair), transparent var(--hair));
  background-size: 100px 100px, 100px 100px, 20px 20px, 20px 20px;
  mask-image: radial-gradient(140% 100% at 50% 0%, #000 40%, transparent 92%);
  -webkit-mask-image: radial-gradient(140% 100% at 50% 0%, #000 40%, transparent 92%);
}
.grain {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity: var(--grain-a);
  mix-blend-mode: multiply;
}
:root[data-theme="dark"] .grain { mix-blend-mode: screen; }

/* ── 4 · hatch patterns — how category is actually encoded ──── */

.h1  { --hatch: repeating-linear-gradient(45deg,  currentColor 0 1.5px, transparent 1.5px 4px); }
.h2  { --hatch: repeating-linear-gradient(-45deg, currentColor 0 1.5px, transparent 1.5px 4px); }
.h3  { --hatch: repeating-linear-gradient(90deg,  currentColor 0 1.5px, transparent 1.5px 3.5px); }
.h4  { --hatch: repeating-linear-gradient(0deg,   currentColor 0 1.5px, transparent 1.5px 3.5px); }
.h5  { --hatch: repeating-linear-gradient(45deg,  currentColor 0 2.5px, transparent 2.5px 5px); }
.h6  { --hatch:
    repeating-linear-gradient(45deg,  currentColor 0 1px, transparent 1px 4px),
    repeating-linear-gradient(-45deg, currentColor 0 1px, transparent 1px 4px); }

.swatch {
  width: 16px; height: 10px; flex: none;
  border: var(--hair) solid currentColor;
  background-image: var(--hatch);
}

/* ── 5 · top rail ───────────────────────────────────────────── */

.rail {
  position: sticky; top: 0; z-index: 90;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  border-bottom: var(--hair) solid var(--ink);
}
.rail__in { display: flex; align-items: stretch; height: 3rem; gap: 0; }

.rail__id {
  display: inline-flex; align-items: center; gap: .6rem; padding-right: 1.1rem;
  border-right: var(--hair) solid var(--rule);
  font: 700 var(--t-sm)/1 var(--narrow); letter-spacing: .2em; text-transform: uppercase;
  white-space: nowrap;
}
.rail__id::before {
  content: ""; width: 9px; height: 9px; flex: none;
  border: 1.5px solid var(--red); border-radius: 50%;
}

.rail__nav { display: flex; margin-left: auto; }
.rail__nav a {
  display: inline-flex; align-items: center; padding-inline: .95rem;
  border-left: var(--hair) solid var(--rule);
  font: 600 var(--t-xs)/1 var(--narrow); letter-spacing: .15em; text-transform: uppercase;
  color: var(--ink-2); position: relative;
  transition: color .2s, background .2s;
}
.rail__nav a:hover { color: var(--ink); background: var(--paper-2); }
.rail__nav a[aria-current] { color: var(--red); }
.rail__nav a[aria-current]::after {
  content: ""; position: absolute; inset: auto 0 -1px 0; height: 2px; background: var(--red);
}

.rail__tools { display: flex; border-left: var(--hair) solid var(--rule); }
.rail__btn {
  display: grid; place-items: center; width: 3rem; background: none;
  border: 0; border-left: var(--hair) solid var(--rule); cursor: pointer;
  color: var(--ink-2); transition: color .2s, background .2s;
}
.rail__btn:first-child { border-left: 0; }
.rail__btn:hover { color: var(--ink); background: var(--paper-2); }
.rail__btn svg { width: 15px; height: 15px; }
.rail__k {
  width: auto; padding-inline: .85rem; gap: .5rem;
  font: 600 var(--t-xs)/1 var(--narrow); letter-spacing: .14em; text-transform: uppercase;
  display: inline-flex; align-items: center;
}
.rail__k kbd { font: 500 10px/1 var(--mono); border: var(--hair) solid var(--rule-2); padding: .2rem .3rem; }

.burger { display: none; }

/* ── 6 · sheet & title block ────────────────────────────────── */

.sheet { position: relative; }

/* corner registration ticks */
.sheet__marks { position: absolute; inset: 0; pointer-events: none; }
.sheet__marks i {
  position: absolute; width: 14px; height: 14px;
  border: var(--hair) solid var(--rule-2);
}
.sheet__marks i:nth-child(1) { top: 0;    left: 0;    border-right: 0; border-bottom: 0; }
.sheet__marks i:nth-child(2) { top: 0;    right: 0;   border-left: 0;  border-bottom: 0; }
.sheet__marks i:nth-child(3) { bottom: 0; left: 0;    border-right: 0; border-top: 0; }
.sheet__marks i:nth-child(4) { bottom: 0; right: 0;   border-left: 0;  border-top: 0; }

.titleblock {
  border-top: 2px solid var(--ink);
  background: var(--well);
}
.titleblock__in {
  display: grid; grid-template-columns: 2.2fr repeat(4, minmax(0, 1fr));
}
.tb {
  padding: .7rem .9rem; border-left: var(--hair) solid var(--rule);
  display: grid; gap: .25rem; align-content: start; min-width: 0;
}
.tb:first-child { border-left: 0; }
.tb dt { margin: 0; font: 600 10px/1 var(--narrow); letter-spacing: .17em; text-transform: uppercase; color: var(--ink-3); }
.tb dd { margin: 0; font: 500 var(--t-md)/1.35 var(--mono); color: var(--ink); word-break: break-word; }
.tb a:hover { color: var(--red); }

/* ── 7 · figure frame — everything of substance is a figure ─── */

.fig {
  position: relative;
  border: var(--hair) solid var(--ink);
  background: var(--well);
  box-shadow: var(--sheet-shadow);
}
.fig__hd {
  display: flex; align-items: center; gap: .8rem; flex-wrap: wrap;
  padding: .55rem .9rem; border-bottom: var(--hair) solid var(--ink);
  background: var(--paper-2);
}
.fig__hd h2, .fig__hd h3 {
  font: 700 var(--t-xs)/1 var(--narrow); letter-spacing: .17em; text-transform: uppercase; color: var(--ink);
}
.fig__hd .a { margin-left: auto; }
.fig__bd { padding: clamp(.85rem, 2vw, 1.4rem); }
.fig__bd--flush { padding: 0; }
.fig__cap {
  padding: .55rem .9rem; border-top: var(--hair) solid var(--rule);
  font: 600 var(--t-xs)/1.5 var(--narrow); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3);
}
.fig__cap b { color: var(--ink-2); }

/* ── 8 · hero — sheet 01 ────────────────────────────────────── */

.hero { padding-block: clamp(2rem, 5vw, 3.75rem) 0; }
.hero__in {
  display: grid; grid-template-columns: minmax(0, 1fr) clamp(230px, 26vw, 350px);
  gap: clamp(1.5rem, 4vw, 3.25rem); align-items: end;
}

.hero__rev {
  display: inline-flex; align-items: center; gap: .55rem;
  padding: .3rem .6rem; margin-bottom: 1.1rem;
  border: var(--hair) solid var(--red); color: var(--red);
  font: 700 var(--t-xs)/1 var(--narrow); letter-spacing: .17em; text-transform: uppercase;
}
.hero__rev::before {
  content: ""; width: 6px; height: 6px; background: var(--red); border-radius: 50%;
  animation: blip 2.6s var(--ease) infinite;
}
@keyframes blip { 0%,100% { opacity: 1; } 50% { opacity: .25; } }

.hero h1 {
  font-size: var(--t-h1); font-weight: 700; letter-spacing: -.04em; line-height: .92;
  text-transform: uppercase; margin-bottom: .2rem;
}
.hero h1 span { display: block; }
/* the underline is a drafting rule with end ticks */
.hero__ruleline {
  position: relative; height: 1.5rem; margin-bottom: 1.1rem;
  border-top: 1.5px solid var(--ink);
  max-width: 30rem;
}
.hero__ruleline::before, .hero__ruleline::after {
  content: ""; position: absolute; top: -6px; width: var(--hair); height: 12px; background: var(--ink);
}
.hero__ruleline::before { left: 0; }
.hero__ruleline::after  { right: 0; }
.hero__ruleline b {
  position: absolute; top: .35rem; left: 0;
  font: 700 var(--t-xs)/1 var(--narrow); letter-spacing: .22em; text-transform: uppercase; color: var(--ink-2);
}

.hero__sub { font-size: var(--t-lead); color: var(--ink-2); max-width: 42ch; line-height: 1.55; }
.hero__sub b { color: var(--ink); font-weight: 600; }

.hero__badges { display: flex; flex-wrap: wrap; gap: 0; margin-top: 1.4rem; border: var(--hair) solid var(--rule); width: fit-content; }
.tag {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .45rem .7rem; border-right: var(--hair) solid var(--rule);
  background: var(--well);
  font: 600 var(--t-xs)/1 var(--narrow); letter-spacing: .13em; text-transform: uppercase;
  color: var(--ink-2); white-space: nowrap;
}
.tag:last-child { border-right: 0; }
a.tag, button.tag { cursor: pointer; transition: color .18s, background .18s; }
a.tag:hover, button.tag:hover { color: var(--red-ink); background: var(--red); }
.tag svg { width: 12px; height: 12px; }

/* portrait, printed as a halftone plate — the mask is painted with the
   current ink, so one asset serves both vellum and blueprint */
.hero__plate {
  position: relative; padding: .55rem .55rem .3rem;
  background: #ece7db; border: var(--hair) solid var(--ink);
  box-shadow: var(--sheet-shadow);
}
.plate {
  width: 100%; aspect-ratio: 1500 / 1585;
  background: #14130d;   /* a photographic plate stays ink-on-paper in both prints */
  -webkit-mask-image: image-set(url("/img/plate-sm.6050702ddc.png") 1x, url("/img/plate.bca635e078.png") 2x);
  mask-image: image-set(url("/img/plate-sm.6050702ddc.png") 1x, url("/img/plate.bca635e078.png") 2x);
  -webkit-mask-size: contain; mask-size: contain;
  -webkit-mask-repeat: no-repeat; mask-repeat: no-repeat;
  -webkit-mask-position: bottom center; mask-position: bottom center;
}
.hero__plate figcaption {
  margin-top: .35rem; padding: .25rem .1rem 0; border-top: var(--hair) solid #b9b2a0;
  font: 600 var(--t-xs)/1.6 var(--narrow);
  letter-spacing: .15em; text-transform: uppercase; color: #8a8374;
  display: flex; justify-content: space-between; gap: 1rem;
}

/* ── 9 · dimensioned trace ──────────────────────────────────── */

.trace { --label: 14rem; --pad: .9rem; margin-top: clamp(1.75rem, 4vw, 3rem); }

.trace__scale {
  display: grid; grid-template-columns: var(--label) minmax(0, 1fr);
  padding: 0 var(--pad); border-bottom: var(--hair) solid var(--ink); background: var(--paper-2);
}
.trace__ticks { position: relative; height: 1.6rem; }
.trace__ticks i {
  position: absolute; top: 0; bottom: 0; translate: -50% 0;
  font: 500 10px/1.6rem var(--mono); color: var(--ink-2); white-space: nowrap;
}
.trace__ticks i::before {
  content: ""; position: absolute; left: 50%; bottom: 0; width: var(--hair); height: 6px; background: var(--rule-2);
}
.trace__ticks i:first-child { translate: 0 0; }
.trace__ticks i:first-child::before { left: 0; }
.trace__ticks i:last-child { translate: -100% 0; color: var(--red); }
.trace__ticks i:last-child::before { left: auto; right: 0; background: var(--red); }

.trace__rows { position: relative; }
.trace__grid { position: absolute; top: 0; bottom: 0; left: calc(var(--label) + var(--pad)); right: var(--pad); pointer-events: none; }
.trace__grid i { position: absolute; top: 0; bottom: 0; width: var(--hair); background: var(--grid-5); }

.row {
  position: relative; display: grid;
  grid-template-columns: var(--label) minmax(0, 1fr);
  align-items: center; height: 2.05rem; width: 100%;
  padding: 0 var(--pad); border: 0; border-bottom: var(--hair) dotted var(--rule);
  background: none; text-align: left; cursor: crosshair; color: inherit;
  transition: background .16s;
}
.row:last-of-type { border-bottom: 0; }
.row:hover, .row[data-on] { background: var(--paper-2); }
.row:focus-visible { outline-offset: -2px; }

.row__name {
  display: flex; align-items: center; gap: .5rem; min-width: 0; padding-right: .6rem;
  font: 600 var(--t-xs)/1 var(--narrow); letter-spacing: .11em; text-transform: uppercase;
  color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.row:hover .row__name, .row[data-on] .row__name { color: var(--ink); }
.row__name .n { font: 500 10px/1 var(--mono); color: var(--ink-3); letter-spacing: 0; }

.row__track { position: relative; height: 100%; color: var(--ink); }

/* the bar: outlined and hatched, the way a drawing fills a region */
.bar {
  position: absolute; top: 50%; translate: 0 -50%; height: .85rem; min-width: 3px;
  border: var(--hair) solid currentColor;
  background-color: color-mix(in srgb, currentColor 13%, transparent);
  background-image: var(--hatch);
  transition: height .2s var(--ease), color .2s, background-color .2s;
}
.row:hover .bar, .row[data-on] .bar { color: var(--red); height: 1.05rem; background-color: color-mix(in srgb, var(--red) 16%, transparent); }
.bar--open { border-right-style: dashed; }

/* extension + dimension lines, drawn on hover like a real callout */
.row__dim {
  position: absolute; top: 50%; translate: 0 -50%; height: 1.5rem;
  opacity: 0; transition: opacity .2s var(--ease); pointer-events: none;
}
.row:hover .row__dim, .row[data-on] .row__dim { opacity: 1; }
.row__dim::before, .row__dim::after {
  content: ""; position: absolute; top: 0; bottom: 0; width: var(--hair); background: var(--red);
}
.row__dim::before { left: 0; }
.row__dim::after  { right: 0; }

.row__len {
  position: absolute; top: 50%; translate: 0 -50%;
  padding-inline: .3rem; background: var(--paper);
  font: 500 10px/1 var(--mono); color: var(--red); white-space: nowrap;
  transition: color .18s;
}

.trace__legend {
  display: flex; flex-wrap: wrap; gap: .4rem 1.15rem;
  padding: .6rem var(--pad); border-top: var(--hair) solid var(--ink); background: var(--paper-2);
}
.trace__legend span {
  display: inline-flex; align-items: center; gap: .45rem;
  font: 600 var(--t-xs)/1 var(--narrow); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3);
}

/* drafting crosshair */
.trace__cross {
  position: absolute; top: 0; bottom: 0; width: var(--hair); z-index: 4;
  background: var(--red); opacity: 0; transition: opacity .18s; pointer-events: none;
}
.trace__rows:hover .trace__cross { opacity: .75; }
.trace__cross b {
  position: absolute; top: -1.45rem; left: 50%; translate: -50% 0;
  padding: .16rem .38rem; background: var(--red); color: var(--red-ink);
  font: 500 10px/1 var(--mono); white-space: nowrap;
}

/* detail callout under the trace */
.detail { border-top: var(--hair) solid var(--ink); background: var(--well); }
.detail__in { padding: clamp(.85rem, 2vw, 1.3rem) var(--pad); display: grid; gap: .65rem; }
.detail__top { display: flex; flex-wrap: wrap; align-items: baseline; gap: .4rem 1rem; }
.detail__top h3 { font-size: var(--t-h3); font-weight: 700; text-transform: uppercase; letter-spacing: -.01em; }
.detail p { color: var(--ink-2); font-size: var(--t-md); line-height: 1.62; max-width: 80ch; }
.detail__chips { display: flex; flex-wrap: wrap; gap: 0; width: fit-content; border: var(--hair) solid var(--rule); }
.detail__chips span {
  padding: .22rem .42rem; border-right: var(--hair) solid var(--rule);
  font: 500 10px/1.3 var(--mono); color: var(--ink-2);
}
.detail__chips span:last-child { border-right: 0; }
.detail__go {
  align-self: start; display: inline-flex; align-items: center; gap: .4rem;
  font: 700 var(--t-xs)/1 var(--narrow); letter-spacing: .15em; text-transform: uppercase; color: var(--red);
}
.detail__go:hover { text-decoration: underline; text-underline-offset: 3px; }
.detail__hint { color: var(--ink-3); font: 600 var(--t-xs)/1.5 var(--narrow); letter-spacing: .14em; text-transform: uppercase; }

/* ── 10 · schedule (services + artifacts as a parts list) ───── */

.sec { padding-block: var(--sec); }

.hd { display: flex; align-items: flex-end; justify-content: space-between; gap: 1rem 2rem; flex-wrap: wrap; margin-bottom: clamp(1rem, 2.2vw, 1.5rem); }
.hd__l { display: grid; gap: .45rem; }
.hd h2 { font-size: var(--t-h2); font-weight: 700; text-transform: uppercase; letter-spacing: -.012em; }
.hd p { color: var(--ink-2); max-width: 54ch; font-size: var(--t-md); }

.parts { border: var(--hair) solid var(--ink); background: var(--well); box-shadow: var(--sheet-shadow); }
.part {
  position: relative; display: grid;
  grid-template-columns: 3rem minmax(0, 1.5fr) minmax(0, 2.4fr) minmax(0, 1fr) 2.2rem;
  gap: 1rem; align-items: center;
  padding: .85rem 1rem; border-bottom: var(--hair) solid var(--rule);
  transition: background .18s;
}
.part:last-child { border-bottom: 0; }
.part:hover { background: var(--paper-2); }
.part__n { font: 500 var(--t-md)/1 var(--mono); color: var(--ink-3); }
.part:hover .part__n { color: var(--red); }
.part__t { display: grid; gap: .18rem; min-width: 0; }
.part__t strong { font-size: var(--t-h3); font-weight: 700; letter-spacing: -.012em; }
.part__t span { font: 600 var(--t-xs)/1.3 var(--narrow); letter-spacing: .13em; text-transform: uppercase; color: var(--ink-3); }
.part__d { color: var(--ink-2); font-size: var(--t-md); line-height: 1.55; min-width: 0; }
.part__m { display: grid; gap: .18rem; }
.part__m b { font: 600 var(--t-md)/1 var(--mono); color: var(--ink); }
.part__m span { font: 600 10px/1.3 var(--narrow); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.part__go { justify-self: end; color: var(--ink-3); transition: transform .2s var(--ease), color .2s; }
.part:hover .part__go { color: var(--red); transform: translateX(3px); }
.part__link { position: absolute; inset: 0; }
.part__link:focus-visible { outline-offset: -3px; }

/* ── 11 · adoption matrix ───────────────────────────────────── */

.matrix { --tcol: 10rem; --ncol: 2.4rem; }
.mx__head, .mx__row {
  display: grid; grid-template-columns: var(--tcol) minmax(0, 1fr) var(--ncol);
  gap: .8rem; align-items: center; padding-inline: .9rem;
}
.mx__head { padding-block: .5rem; border-bottom: var(--hair) solid var(--ink); background: var(--paper-2); }
.mx__years { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 2px; }
.mx__years span { font: 500 10px/1 var(--mono); color: var(--ink-2); text-align: center; }
.mx__body { padding-block: .25rem; }
.mx__row { height: 1.6rem; transition: background .16s; }
.mx__row:hover { background: var(--paper-2); }
.mx__t { font: 600 var(--t-xs)/1 var(--narrow); letter-spacing: .11em; text-transform: uppercase; color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mx__row:hover .mx__t { color: var(--red); }
.mx__cells { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 2px; color: var(--ink-2); }
.mx__cells i {
  height: .8rem; border: var(--hair) solid currentColor;
  background-image: var(--hatch); opacity: var(--o, 1);
}
.mx__cells i.off { border-color: var(--rule); background: none; }
.mx__row:hover .mx__cells { color: var(--red); }
.mx__n { font: 500 var(--t-md)/1 var(--mono); color: var(--ink-3); text-align: right; }

/* ── 12 · document pages ────────────────────────────────────── */

.doc { padding-block: clamp(1.5rem, 3.5vw, 2.5rem) 0; }

.crumb { display: flex; align-items: center; gap: .4rem; margin-bottom: 1.1rem; }
.crumb a, .crumb span { font: 600 var(--t-xs)/1 var(--narrow); letter-spacing: .15em; text-transform: uppercase; color: var(--ink-3); }
.crumb a:hover { color: var(--red); }
.crumb .sl { color: var(--rule-2); }

.doc__hd { display: grid; gap: .85rem; padding-bottom: clamp(1.1rem, 2.4vw, 1.6rem); border-bottom: 2px solid var(--ink); }
.doc__hd h1 { font-size: clamp(1.7rem, 2.8vw + 1rem, 3rem); font-weight: 700; text-transform: uppercase; letter-spacing: -.028em; max-width: 22ch; }
.doc__thesis { font-size: var(--t-lead); color: var(--ink-2); max-width: 64ch; line-height: 1.52; }
.doc__badges { display: flex; flex-wrap: wrap; gap: 0; width: fit-content; border: var(--hair) solid var(--rule); }

/* sheet metadata — auto-fit so a sixth field doesn't orphan onto its own row */
.docmeta {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
  border-bottom: var(--hair) solid var(--ink);
}
.docmeta .tb { border-top: var(--hair) solid var(--rule); }
.docmeta .tb:first-child { border-left: 0; }

.body { display: grid; gap: clamp(1.75rem, 3.5vw, 2.75rem); padding-block: clamp(1.75rem, 3.5vw, 2.75rem); }
.blk { --blk-label: 8.5rem; --blk-gap: clamp(.8rem, 2.2vw, 1.75rem);
  display: grid; grid-template-columns: var(--blk-label) minmax(0, 1fr); gap: var(--blk-gap); align-items: start; }
.blk__n { display: grid; gap: .3rem; }
.blk__n b { font: 700 var(--t-xs)/1 var(--narrow); letter-spacing: .17em; text-transform: uppercase; color: var(--ink-3); }
.blk__n i { display: block; height: var(--hair); background: var(--rule); }
.blk__b { display: grid; gap: .9rem; }
.blk__b > p, .blk__b > ul { max-width: 70ch; }
.blk__b h2 { font-size: var(--t-h2); font-weight: 700; text-transform: uppercase; letter-spacing: -.012em; }
.blk__b p { color: var(--ink-2); line-height: 1.68; }
.blk__b strong { color: var(--ink); font-weight: 600; }
.blk__b ul { margin: 0; padding: 0; list-style: none; display: grid; gap: .6rem; counter-reset: b; }
.blk__b ul li { position: relative; padding-left: 1.6rem; color: var(--ink-2); line-height: 1.62; counter-increment: b; }
.blk__b ul li::before {
  content: counter(b, decimal-leading-zero); position: absolute; left: 0; top: .18em;
  font: 500 10px/1 var(--mono); color: var(--red);
}
.blk__b code { font: 500 .875em/1 var(--mono); background: var(--paper-2); border: var(--hair) solid var(--rule); padding: .1em .3em; }
.blk__b a:not(.tag) { color: var(--red); text-decoration: underline; text-underline-offset: 3px; }

/* decision log — considered and rejected, which is the interesting part */
.dec { border: var(--hair) solid var(--ink); background: var(--well); }
.dec__r { display: grid; grid-template-columns: 2.2rem minmax(0, 1fr); border-bottom: var(--hair) solid var(--rule); }
.dec__r:last-child { border-bottom: 0; }
.dec__k { display: grid; place-items: center; border-right: var(--hair) solid var(--rule); background: var(--paper-2); font: 500 var(--t-md)/1 var(--mono); color: var(--ink-3); }
.dec__c { padding: .8rem .95rem; display: grid; gap: .3rem; }
.dec__c strong { font: 700 var(--t-md)/1.3 var(--narrow); letter-spacing: .1em; text-transform: uppercase; }
.dec__c p { color: var(--ink-2); font-size: var(--t-md); line-height: 1.58; }
.dec__r[data-pick] .dec__k { background: var(--red); color: var(--red-ink); }
.dec__r[data-pick] .dec__c strong { color: var(--red); }

/* measured values */
.vals { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 138px), 1fr)); border: var(--hair) solid var(--ink); background: var(--well); }
.val { padding: .85rem .95rem; border-left: var(--hair) solid var(--rule); display: grid; gap: .3rem; }
.val:first-child { border-left: 0; }
.val b { font: 600 clamp(1.3rem, 1.5vw + 1rem, 1.7rem)/1 var(--mono); letter-spacing: -.035em; }
.val span { font: 600 10px/1.4 var(--narrow); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }

.plan { overflow-x: auto; }
.plan svg { width: 100%; min-width: 600px; height: auto; }

.pager { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border: var(--hair) solid var(--ink); background: var(--well); margin-bottom: var(--sec); }
.pager a { padding: .95rem 1.1rem; display: grid; gap: .3rem; border-left: var(--hair) solid var(--rule); transition: background .18s; }
.pager a:first-child { border-left: 0; }
.pager a:hover { background: var(--paper-2); }
.pager a:last-child { text-align: right; }
.pager a:only-child { grid-column: 1 / -1; }
.pager strong { font-size: var(--t-h3); font-weight: 700; text-transform: uppercase; letter-spacing: -.01em; }
.pager a:hover strong { color: var(--red); }

.toc { display: none; }
@media (min-width: 1120px) {
  .doc__grid { display: grid; grid-template-columns: minmax(0, 1fr) 10.5rem; gap: clamp(1.75rem, 3.5vw, 3rem); align-items: start; }
  .toc { display: block; position: sticky; top: 4.25rem; padding-top: clamp(1.75rem, 3.5vw, 2.75rem); }
  .toc ul { list-style: none; margin: .5rem 0 0; padding: 0; }
  .toc a { display: block; padding: .28rem .5rem; border-left: var(--hair) solid var(--rule);
    font: 600 var(--t-xs)/1.5 var(--narrow); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
  .toc a:hover { color: var(--ink); }
  .toc a[aria-current] { color: var(--red); border-left-color: var(--red); }
}
.doc__grid { display: grid; grid-template-columns: minmax(0, 1fr); }

/* ── 13 · résumé ────────────────────────────────────────────── */

.rz { display: grid; grid-template-columns: 8.5rem minmax(0, 1fr); gap: clamp(.8rem, 2.2vw, 1.75rem); align-items: start; padding-block: clamp(1.1rem, 2.4vw, 1.75rem); border-top: var(--hair) solid var(--rule); }
.rz__b { display: grid; gap: 1.15rem; }
.rz__i { display: grid; gap: .3rem; }
.rz__t { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: .3rem 1rem; }
.rz__t h3 { font-size: var(--t-h3); font-weight: 700; text-transform: uppercase; letter-spacing: -.01em; }
.rz__o { color: var(--ink-2); font-size: var(--t-md); }
.rz__b ul { margin: .2rem 0 0; padding: 0; list-style: none; display: grid; gap: .42rem; counter-reset: r; }
.rz__b ul li { position: relative; padding-left: 1.5rem; color: var(--ink-2); font-size: var(--t-md); line-height: 1.58; counter-increment: r; }
.rz__b ul li::before { content: counter(r, decimal-leading-zero); position: absolute; left: 0; top: .2em; font: 500 10px/1 var(--mono); color: var(--red); }

/* ── 14 · command palette — drawing index ───────────────────── */

.cmdk[hidden] { display: none; }
.cmdk {
  position: fixed; inset: 0; z-index: 200; display: grid; place-items: start center;
  padding: clamp(2.5rem, 11vh, 7rem) 1rem 1rem;
  background: color-mix(in srgb, var(--ink) 42%, transparent);
  animation: fade .15s var(--ease);
}
@keyframes fade { from { opacity: 0; } }
.cmdk__box { width: 100%; max-width: 540px; background: var(--well); border: var(--hair) solid var(--ink); box-shadow: 0 30px 70px -30px rgba(0,0,0,.55); animation: drop .2s var(--ease); }
@keyframes drop { from { opacity: 0; transform: translateY(-8px); } }
.cmdk__f { display: flex; align-items: center; gap: .6rem; padding: .7rem .9rem; border-bottom: var(--hair) solid var(--ink); background: var(--paper-2); }
.cmdk__f svg { width: 14px; height: 14px; color: var(--ink-3); flex: none; }
.cmdk__f input { flex: 1; background: none; border: 0; outline: none; color: var(--ink); font: 500 .9375rem/1.2 var(--sans); }
.cmdk__f input::placeholder { color: var(--ink-3); }
.cmdk__l { max-height: min(48vh, 21rem); overflow-y: auto; padding: 0; margin: 0; list-style: none; }
.cmdk__g { padding: .5rem .9rem .25rem; font: 700 10px/1 var(--narrow); letter-spacing: .17em; text-transform: uppercase; color: var(--ink-3); }
.cmdk__o { display: flex; align-items: center; gap: .6rem; padding: .45rem .9rem; cursor: pointer; color: var(--ink-2); font-size: .875rem; }
.cmdk__o svg { width: 13px; height: 13px; flex: none; opacity: .65; }
.cmdk__o[aria-selected="true"] { background: var(--red); color: var(--red-ink); }
.cmdk__o[aria-selected="true"] .h, .cmdk__o[aria-selected="true"] svg { color: var(--red-ink); opacity: 1; }
.cmdk__o .h { margin-left: auto; font: 500 10px/1 var(--mono); color: var(--ink-3); }
.cmdk__e { padding: 1.4rem .9rem; text-align: center; color: var(--ink-3); font-size: .875rem; }
.cmdk__ft { display: flex; gap: .85rem; padding: .45rem .9rem; border-top: var(--hair) solid var(--rule); background: var(--paper-2); }
.cmdk__ft span { font: 600 10px/1 var(--narrow); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }

/* ── 15 · toast ─────────────────────────────────────────────── */

.toast {
  position: fixed; left: 50%; bottom: 1.5rem; z-index: 220; translate: -50% 1rem;
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .5rem .85rem; background: var(--ink); color: var(--paper);
  font: 600 var(--t-xs)/1 var(--narrow); letter-spacing: .14em; text-transform: uppercase;
  opacity: 0; pointer-events: none; transition: opacity .22s var(--ease), translate .22s var(--ease);
}
.toast[data-show] { opacity: 1; translate: -50% 0; }

/* ── 16 · plotter draw-in ───────────────────────────────────── */

.plan [data-draw] {
  stroke-dasharray: var(--len, 1200); stroke-dashoffset: var(--len, 1200);
}
.plan[data-drawn] [data-draw] {
  animation: plot 1.1s var(--ease) forwards; animation-delay: var(--d, 0ms);
}
@keyframes plot { to { stroke-dashoffset: 0; } }

.trace[data-drawn] .bar { animation: extend .7s var(--ease) backwards; animation-delay: var(--sd, 0ms); transform-origin: left center; }
@keyframes extend { from { transform: scaleX(.01); } }

[data-rv] { opacity: 0; }
[data-rv][data-in] { opacity: 1; transition: opacity .5s var(--ease); transition-delay: var(--d, 0ms); }

/* ── 17 · responsive ────────────────────────────────────────── */

@media (max-width: 1000px) {
  .trace { --label: 10rem; }
  .hero__in { grid-template-columns: minmax(0, 1fr) clamp(190px, 24vw, 260px); }
  .part { grid-template-columns: 2.4rem minmax(0, 1.4fr) minmax(0, 2fr) 2rem; }
  .part__m { display: none; }
}

@media (max-width: 760px) {
  .rail__nav { display: none; }
  .rail__k { display: none; }
  .burger { display: grid; place-items: center; gap: 3.5px; width: 3rem; background: none; border: 0; border-left: var(--hair) solid var(--rule); cursor: pointer; }
  .burger span { display: block; width: 14px; height: 1.5px; background: var(--ink-2); transition: transform .25s var(--ease), opacity .18s; }
  .rail[data-open] .burger span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
  .rail[data-open] .burger span:nth-child(2) { opacity: 0; }
  .rail[data-open] .burger span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
  .rail[data-open] .rail__nav {
    position: absolute; inset: 3rem 0 auto 0; display: grid; background: var(--well);
    border-bottom: var(--hair) solid var(--ink);
  }
  .rail[data-open] .rail__nav a { border-left: 0; border-bottom: var(--hair) solid var(--rule); padding: .8rem var(--gut); }

  .hero__in { grid-template-columns: 1fr; gap: 1.25rem; }
  .hero__plate { width: min(58%, 220px); order: -1; }
  .hero__badges { width: 100%; }
  .tag { flex: 1 1 auto; justify-content: center; }

  .trace { --label: 0rem; --pad: .7rem; }
  .trace__scale { grid-template-columns: minmax(0, 1fr); }
  .trace__grid { left: var(--pad); }
  .row { grid-template-columns: minmax(0, 1fr); height: auto; padding-block: .45rem; gap: .25rem; align-items: stretch; }
  .row__track { height: .95rem; }
  .row__len, .row__dim { display: none; }
  .trace__ticks i:nth-child(2), .trace__ticks i:nth-child(3),
  .trace__ticks i:nth-child(5), .trace__ticks i:nth-child(6) { display: none; }

  .part { grid-template-columns: 2.2rem minmax(0, 1fr); gap: .5rem .75rem; }
  .part__d, .part__go { display: none; }

  .matrix { --tcol: 6rem; --ncol: 1.8rem; }
  .mx__head, .mx__row { gap: .5rem; padding-inline: .7rem; }
  .mx__years span { font-size: 9px; }

  .blk { grid-template-columns: 1fr; gap: .5rem; }
  .rz { grid-template-columns: 1fr; gap: .5rem; }
  .pager { grid-template-columns: 1fr; }
  .pager a { border-left: 0; border-top: var(--hair) solid var(--rule); }
  .pager a:first-child { border-top: 0; }
  .pager a:last-child { text-align: left; }

  .titleblock__in { grid-template-columns: 1fr 1fr; }
  .tb { border-top: var(--hair) solid var(--rule); }
  .tb:nth-child(-n+2) { border-top: 0; }
  .tb:nth-child(odd) { border-left: 0; }
}

/* ── 18 · motion, transitions, print ────────────────────────── */

@view-transition { navigation: auto; }
::view-transition-old(root) { animation: sheet-out .2s var(--ease) both; }
::view-transition-new(root) { animation: sheet-in .28s var(--ease) both; }
@keyframes sheet-out { to   { opacity: 0; } }
@keyframes sheet-in  { from { opacity: 0; transform: translateY(8px); } }
.rail { view-transition-name: rail; }
::view-transition-group(rail) { animation: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  [data-rv] { opacity: 1; }
  .plan [data-draw] { stroke-dashoffset: 0; }
  ::view-transition-old(root), ::view-transition-new(root) { animation: none; }
}

@media print {
  .rail, .cmdk, .toast, .grain, .grid-bg, .trace__cross, .detail { display: none !important; }
  body { background: #fff; color: #000; }
  .fig, .parts, .vals, .dec { border-color: #000; background: #fff; box-shadow: none; }
  .sec { padding-block: 1rem; break-inside: avoid; }
  a { text-decoration: underline; }
}