@charset "utf-8";
/* ==========================================================================
   OMENKA — the design system for uchearistotle.com
   Every page is a drawing sheet: grid field, datum rules, a title block.
   Two states: "vellum" (paper) and "viewport" (CAD dark).
   ========================================================================== */

/* --------------------------------------------------------------- 1. tokens */
:root {
  /* paper */
  --paper:        #f4f0e7;
  --paper-2:      #ece7db;
  --paper-3:      #e2dbca;
  --paper-sunk:   #e8e2d4;

  /* ink */
  --ink:          #16181d;
  --ink-2:        #3c414b;
  --ink-3:        #6d7480;
  --ink-4:        #8d94a0;

  /* line work */
  --line:         #d3cbba;
  --line-2:       #bcb2a0;
  --line-3:       #9d9382;

  /* signal */
  --ember:        #bf4419;
  --ember-2:      #d96336;
  --ember-wash:   rgba(191, 68, 25, .09);
  --datum:        #26606f;
  --datum-wash:   rgba(38, 96, 111, .10);
  --brass:        #8f7210;
  --brass-wash:   rgba(143, 114, 16, .12);

  --grid-line:    rgba(22, 24, 29, .045);
  --grid-line-lg: rgba(22, 24, 29, .075);
  --shadow-1:     0 1px 2px rgba(30, 25, 15, .05), 0 6px 18px -10px rgba(30, 25, 15, .22);
  --shadow-2:     0 2px 4px rgba(30, 25, 15, .06), 0 20px 45px -22px rgba(30, 25, 15, .35);

  /* type */
  --f-display: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --f-sans:    "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --f-mono:    "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* rhythm */
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --measure: 68ch;
  --sheet-max: 1280px;
  --r-sm: 3px;
  --r:    5px;
  --r-lg: 8px;

  --ease: cubic-bezier(.22, .68, .32, 1);
  --dur: .42s;

  color-scheme: light;
}

[data-theme="viewport"] {
  --paper:        #0a0c10;
  --paper-2:      #10141a;
  --paper-3:      #171c24;
  --paper-sunk:   #070910;

  --ink:          #ecebe5;
  --ink-2:        #b7bcc6;
  --ink-3:        #838a97;
  --ink-4:        #666e7c;

  --line:         #232a35;
  --line-2:       #333b49;
  --line-3:       #4a5364;

  --ember:        #ec7442;
  --ember-2:      #f59468;
  --ember-wash:   rgba(236, 116, 66, .12);
  --datum:        #63aec1;
  --datum-wash:   rgba(99, 174, 193, .12);
  --brass:        #d3b153;
  --brass-wash:   rgba(211, 177, 83, .14);

  --grid-line:    rgba(150, 180, 220, .045);
  --grid-line-lg: rgba(150, 180, 220, .075);
  --shadow-1:     0 1px 2px rgba(0, 0, 0, .5), 0 8px 22px -12px rgba(0, 0, 0, .8);
  --shadow-2:     0 2px 6px rgba(0, 0, 0, .55), 0 26px 55px -24px rgba(0, 0, 0, .9);

  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="vellum"]) {
    --paper:        #0a0c10;
    --paper-2:      #10141a;
    --paper-3:      #171c24;
    --paper-sunk:   #070910;
    --ink:          #ecebe5;
    --ink-2:        #b7bcc6;
    --ink-3:        #838a97;
    --ink-4:        #666e7c;
    --line:         #232a35;
    --line-2:       #333b49;
    --line-3:       #4a5364;
    --ember:        #ec7442;
    --ember-2:      #f59468;
    --ember-wash:   rgba(236, 116, 66, .12);
    --datum:        #63aec1;
    --datum-wash:   rgba(99, 174, 193, .12);
    --brass:        #d3b153;
    --brass-wash:   rgba(211, 177, 83, .14);
    --grid-line:    rgba(150, 180, 220, .045);
    --grid-line-lg: rgba(150, 180, 220, .075);
    --shadow-1:     0 1px 2px rgba(0, 0, 0, .5), 0 8px 22px -12px rgba(0, 0, 0, .8);
    --shadow-2:     0 2px 6px rgba(0, 0, 0, .55), 0 26px 55px -24px 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: 6rem;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-sans);
  font-size: clamp(1rem, .96rem + .18vw, 1.075rem);
  line-height: 1.65;
  font-feature-settings: "kern", "liga", "cv05";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* The drawing field. 8 mm minor / 40 mm major, like a real sheet. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
    linear-gradient(var(--grid-line-lg) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line-lg) 1px, transparent 1px);
  background-size: 24px 24px, 24px 24px, 120px 120px, 120px 120px;
  mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 20%, transparent 78%);
}

body > * { position: relative; z-index: 1; }

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

/* Components below set display:flex/grid, which outranks the user-agent rule
   for [hidden]. Without this, hiding anything from script silently fails. */
[hidden] { display: none !important; }

a { color: inherit; text-decoration-color: var(--line-2); text-underline-offset: .22em; }
a:hover { text-decoration-color: var(--ember); }

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

::selection { background: var(--ember); color: #fff; }

hr { border: 0; border-top: 1px solid var(--line); margin: 3rem 0; }

/* ----------------------------------------------------------------- 3. type */
h1, h2, h3, h4 {
  margin: 0 0 .5em;
  line-height: 1.08;
  font-weight: 600;
  letter-spacing: -.018em;
  text-wrap: balance;
}

.display {
  font-family: var(--f-display);
  font-weight: 400;
  letter-spacing: -.012em;
  line-height: 1.02;
}

h1 { font-size: clamp(2.6rem, 1.7rem + 4.2vw, 5.4rem); }
h2 { font-size: clamp(1.85rem, 1.4rem + 2vw, 3rem); }
h3 { font-size: clamp(1.25rem, 1.1rem + .7vw, 1.6rem); }
h4 { font-size: 1.06rem; }

p { margin: 0 0 1.15em; }
p:last-child { margin-bottom: 0; }

.lede {
  font-size: clamp(1.12rem, 1.02rem + .5vw, 1.42rem);
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 46ch;
}

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: 1.15em; }
/* Prose headings step down hard from page headings — a section marker inside an
   article should not compete with the article's own title. */
.prose h2 {
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(1.55rem, 1.3rem + .8vw, 2.05rem);
  line-height: 1.12;
  letter-spacing: -.01em;
  margin-top: 2.2em;
}
.prose h3 {
  font-size: clamp(1.08rem, 1rem + .3vw, 1.25rem);
  font-weight: 620;
  margin-top: 1.9em;
}
.prose h2 + p, .prose h3 + p { margin-top: .6em; }
.prose ul, .prose ol { padding-left: 1.15em; }
.prose li { margin-bottom: .5em; }
.prose li::marker { color: var(--ember); }
.prose strong { font-weight: 620; color: var(--ink); }
.prose code {
  font-family: var(--f-mono);
  font-size: .88em;
  background: var(--paper-3);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: .12em .38em;
}
.prose pre {
  font-family: var(--f-mono);
  font-size: .85rem;
  line-height: 1.6;
  background: var(--paper-sunk);
  border: 1px solid var(--line);
  border-left: 3px solid var(--datum);
  border-radius: var(--r);
  padding: 1rem 1.15rem;
  overflow-x: auto;
}
.prose pre code { background: none; border: 0; padding: 0; font-size: inherit; }
.prose blockquote {
  margin: 2em 0;
  padding: .2em 0 .2em 1.4rem;
  border-left: 3px solid var(--ember);
  font-family: var(--f-display);
  font-size: 1.3em;
  line-height: 1.35;
  color: var(--ink);
}
.prose blockquote p { margin-bottom: .4em; }
.prose figure { margin: 2.2em 0; }
.prose figcaption {
  font-family: var(--f-mono);
  font-size: .74rem;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: .7rem;
  padding-left: .9rem;
  border-left: 2px solid var(--line-2);
}
.prose table { width: 100%; border-collapse: collapse; font-size: .93rem; }
.prose th, .prose td { text-align: left; padding: .6rem .8rem; border-bottom: 1px solid var(--line); }
.prose th { font-family: var(--f-mono); font-size: .72rem; letter-spacing: .07em; text-transform: uppercase; color: var(--ink-3); }

/* Mono annotation — the voice of the drawing, not the person. */
.anno {
  font-family: var(--f-mono);
  font-size: .715rem;
  font-weight: 500;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.anno--ember { color: var(--ember); }
.anno--datum { color: var(--datum); }

/* --------------------------------------------------------------- 4. layout */
.wrap {
  width: min(100% - var(--gutter) * 2, var(--sheet-max));
  margin-inline: auto;
}
.wrap--narrow { width: min(100% - var(--gutter) * 2, 780px); }
.wrap--wide   { width: min(100% - var(--gutter) * 2, 1480px); }

section { padding-block: clamp(3.5rem, 7vw, 7rem); }
section.tight { padding-block: clamp(2.25rem, 4vw, 3.5rem); }

.stack > * + * { margin-top: var(--s, 1rem); }
.cols { display: grid; gap: clamp(1.5rem, 3vw, 3rem); }
/* Grid items default to min-width:auto, so one long unbreakable string — a
   formula in a <pre>, a URL — widens the whole track and scrolls the page. */
.cols > * { min-width: 0; }
@media (min-width: 900px) {
  .cols--2 { grid-template-columns: repeat(2, 1fr); }
  .cols--3 { grid-template-columns: repeat(3, 1fr); }
  .cols--4 { grid-template-columns: repeat(4, 1fr); }
  .cols--sidebar { grid-template-columns: minmax(0, 1fr) 20rem; }
  .cols--aside { grid-template-columns: 15rem minmax(0, 1fr); }
}
@media (min-width: 640px) and (max-width: 899px) {
  .cols--3, .cols--4 { grid-template-columns: repeat(2, 1fr); }
}

/* ------------------------------------------------- 5. section head + rules */
.rule {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  margin-bottom: clamp(1.75rem, 3vw, 2.75rem);
}
/* No empty pseudo-elements here: on a grid they become real items, so a rule
   with a label at each end wraps onto two rows. */
.rule__line { height: 1px; background: var(--line-2); }
.rule__no {
  font-family: var(--f-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--ink-4);
}

/* A dimension line: |<———— text ————>| */
.dim {
  display: flex;
  align-items: center;
  gap: .8rem;
  font-family: var(--f-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.dim::before, .dim::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line-2);
  position: relative;
}
.dim--left::before { display: none; }
.dim--left { justify-content: flex-start; }
.dim--left::after { flex: 0 0 clamp(2rem, 12vw, 8rem); }

.sec-head { margin-bottom: clamp(2rem, 4vw, 3.25rem); }
.sec-head__kicker { display: flex; align-items: center; gap: .7rem; margin-bottom: 1rem; }
.sec-head__kicker::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.sec-head h2 { max-width: 20ch; }
.sec-head p { max-width: 56ch; color: var(--ink-2); margin-top: .9rem; }

/* --------------------------------------------------------------- 6. header */
.masthead {
  position: sticky;
  top: 0;
  z-index: 60;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.masthead[data-stuck="true"] { border-bottom-color: var(--line); }

.masthead__in {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: 4.4rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  text-decoration: none;
  flex: 0 0 auto;
}
.brand__mark { width: 2rem; height: 2rem; color: var(--ember); flex: none; }
.brand__mark path { transition: stroke-dashoffset 1.1s var(--ease); }
.brand__txt { display: grid; line-height: 1.05; }
.brand__name { font-weight: 640; font-size: .98rem; letter-spacing: -.01em; }
.brand__role {
  font-family: var(--f-mono);
  font-size: .625rem;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.brand:hover .brand__mark { color: var(--ember-2); }

.nav { margin-left: auto; }
.nav__list {
  display: flex;
  align-items: center;
  gap: .15rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__link {
  display: block;
  padding: .5rem .78rem;
  font-size: .89rem;
  font-weight: 500;
  color: var(--ink-2);
  text-decoration: none;
  border-radius: var(--r);
  position: relative;
  transition: color .2s var(--ease), background .2s var(--ease);
}
.nav__link:hover { color: var(--ink); background: var(--paper-3); }
.nav__link[aria-current="page"] { color: var(--ink); }
.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: .78rem;
  right: .78rem;
  bottom: .22rem;
  height: 2px;
  background: var(--ember);
  border-radius: 2px;
}

.mast-tools { display: flex; align-items: center; gap: .4rem; flex: 0 0 auto; }

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 2.3rem;
  height: 2.3rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-2);
  border-radius: var(--r);
  cursor: pointer;
  transition: all .2s var(--ease);
}
.icon-btn:hover { color: var(--ink); border-color: var(--line-3); background: var(--paper-3); }
.icon-btn svg { width: 1.05rem; height: 1.05rem; }
.icon-btn .i-sun { display: none; }
[data-theme="viewport"] .icon-btn .i-sun { display: block; }
[data-theme="viewport"] .icon-btn .i-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="vellum"]) .icon-btn .i-sun { display: block; }
  :root:not([data-theme="vellum"]) .icon-btn .i-moon { display: none; }
}

.nav-toggle { display: none; }

@media (max-width: 1023px) {
  .nav-toggle { display: inline-grid; }
  .nav {
    position: fixed;
    inset: 4.4rem 0 auto;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: .75rem var(--gutter) 1.5rem;
    transform: translateY(-115%);
    transition: transform .4s var(--ease);
    box-shadow: var(--shadow-2);
    max-height: calc(100dvh - 4.4rem);
    overflow-y: auto;
  }
  .nav[data-open="true"] { transform: none; }
  .nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav__link { padding: .8rem .25rem; font-size: 1.05rem; border-bottom: 1px solid var(--line); border-radius: 0; }
  .nav__link[aria-current="page"]::after { left: .25rem; right: auto; width: 1.4rem; bottom: .55rem; }
}

.skip {
  position: absolute;
  left: -9999px;
  top: .5rem;
  background: var(--ink);
  color: var(--paper);
  padding: .6rem 1rem;
  border-radius: var(--r);
  z-index: 100;
}
.skip:focus { left: 1rem; }

/* ---------------------------------------------------------------- 7. hero */
.hero {
  position: relative;
  padding-block: clamp(3rem, 8vw, 7rem) clamp(3rem, 7vw, 6rem);
  overflow: hidden;
}
.hero__grid {
  display: grid;
  gap: clamp(2.5rem, 5vw, 4rem);
  align-items: center;
}
@media (min-width: 960px) {
  .hero__grid { grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr); }
}

.hero__eyebrow { display: flex; align-items: center; gap: .8rem; margin-bottom: 1.6rem; }
.hero__eyebrow::after { content: ""; flex: 1; height: 1px; background: var(--line-2); max-width: 8rem; }

.hero h1 { margin-bottom: .35em; }
.hero h1 .given { display: block; color: var(--ember); font-size: .215em; font-family: var(--f-mono); letter-spacing: .26em; text-transform: uppercase; margin-bottom: 1.5em; font-weight: 500; }
.hero h1 em { font-style: normal; color: var(--ember); }

.hero__cta { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }

/* The signature: a circle that draws itself. */
.hero__circle { position: relative; display: grid; place-items: center; }
.hero__circle svg { width: min(100%, 30rem); color: var(--ember); overflow: visible; }
.hero__circle .draw {
  stroke-dasharray: var(--len, 900);
  stroke-dashoffset: var(--len, 900);
  animation: draw 2.6s var(--ease) .35s forwards;
}
.hero__circle .hub { opacity: 0; animation: fade .6s var(--ease) 2.5s forwards; }
.hero__circle .cross { opacity: 0; animation: fade .8s var(--ease) 2.7s forwards; }
.hero__circle figcaption {
  position: absolute;
  bottom: -.5rem;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
}
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes fade { to { opacity: 1; } }

/* Scrolling capability marquee */
.ticker {
  border-block: 1px solid var(--line);
  background: var(--paper-2);
  overflow: hidden;
  padding-block: .8rem;
  mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
}
.ticker__track { display: flex; gap: 0; width: max-content; animation: slide 62s linear infinite; }
.ticker:hover .ticker__track { animation-play-state: paused; }
.ticker__item {
  font-family: var(--f-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-inline: 1.5rem;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.ticker__item::after { content: ""; width: 4px; height: 4px; border-radius: 50%; background: var(--ember); opacity: .55; }
@keyframes slide { to { transform: translateX(-50%); } }

/* -------------------------------------------------------------- 8. buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .78rem 1.35rem;
  font-family: var(--f-sans);
  font-size: .9rem;
  font-weight: 560;
  letter-spacing: -.005em;
  line-height: 1;
  text-decoration: none;
  border: 1px solid var(--ink);
  border-radius: var(--r);
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  transition: all .22s var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-1); background: var(--ember); border-color: var(--ember); color: #fff; }
.btn:active { transform: none; }
.btn svg { width: 1rem; height: 1rem; }

.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
.btn--ghost:hover { background: transparent; color: var(--ember); border-color: var(--ember); }

.btn--ember { background: var(--ember); border-color: var(--ember); color: #fff; }
.btn--ember:hover { background: var(--ink); border-color: var(--ink); color: var(--paper); }

.btn--sm { padding: .55rem 1rem; font-size: .82rem; }

.lnk {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-family: var(--f-mono);
  font-size: .76rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ember);
  text-decoration: none;
  font-weight: 500;
}
.lnk::after { content: "→"; transition: transform .22s var(--ease); }
.lnk:hover::after { transform: translateX(4px); }

/* ---------------------------------------------------------- 9. panels/cards */
.panel {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(1.25rem, 2.5vw, 2rem);
}
.panel--sunk { background: var(--paper-sunk); }
.panel--flush { padding: 0; overflow: hidden; }

/* Corner ticks — the registration marks on a sheet. */
.ticked { position: relative; }
.ticked::before, .ticked::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border: 1px solid var(--line-3);
  pointer-events: none;
}
.ticked::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.ticked::after  { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

.card {
  display: flex;
  flex-direction: column;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: border-color .28s var(--ease), transform .28s var(--ease), box-shadow .28s var(--ease);
}
a.card:hover { border-color: var(--line-3); transform: translateY(-3px); box-shadow: var(--shadow-2); }
.card__media { position: relative; aspect-ratio: 16 / 10; overflow: hidden; background: var(--paper-3); }
.card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s var(--ease); }
a.card:hover .card__media img { transform: scale(1.035); }
.card__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(6, 8, 12, .5));
  opacity: 0;
  transition: opacity .35s var(--ease);
}
a.card:hover .card__media::after { opacity: 1; }
.card__body { padding: 1.15rem 1.25rem 1.35rem; display: flex; flex-direction: column; gap: .55rem; flex: 1; }
.card__title { font-size: 1.12rem; font-weight: 600; letter-spacing: -.015em; line-height: 1.25; margin: 0; }
.card__desc { font-size: .92rem; color: var(--ink-2); margin: 0; }
.card__foot { margin-top: auto; padding-top: .85rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }

/* Media plate with drawing-sheet chrome */
.plate { position: relative; border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; background: var(--paper-3); }
.plate img { width: 100%; height: auto; }
.plate__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  border-top-right-radius: var(--r);
  padding: .45rem .8rem;
}

/* ------------------------------------------------------------ 10. tag/chip */
.tags { display: flex; flex-wrap: wrap; gap: .4rem; }
.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-family: var(--f-mono);
  font-size: .66rem;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .28rem .55rem;
  border: 1px solid var(--line-2);
  border-radius: 2px;
  color: var(--ink-3);
  background: transparent;
  text-decoration: none;
  cursor: pointer;
  transition: all .2s var(--ease);
}
.tag:hover { color: var(--ink); border-color: var(--line-3); }
.tag[aria-pressed="true"], .tag--on { color: var(--ember); border-color: var(--ember); background: var(--ember-wash); }
.tag--datum { color: var(--datum); border-color: color-mix(in srgb, var(--datum) 45%, transparent); background: var(--datum-wash); }
.tag--brass { color: var(--brass); border-color: color-mix(in srgb, var(--brass) 45%, transparent); background: var(--brass-wash); }

/* Feature control frame — a real GD&T callout used as a UI object. */
.fcf {
  display: inline-flex;
  align-items: stretch;
  border: 1.5px solid var(--ink);
  border-radius: 1px;
  font-family: var(--f-mono);
  font-size: .78rem;
  line-height: 1;
  background: var(--paper);
  overflow: hidden;
}
.fcf > span { padding: .42rem .6rem; display: inline-flex; align-items: center; gap: .3rem; border-right: 1.5px solid var(--ink); }
.fcf > span:last-child { border-right: 0; }
.fcf__sym { font-size: 1rem; color: var(--ember); }

/* ------------------------------------------------------------- 11. figures */
.stat { display: grid; gap: .3rem; }
.stat__val {
  font-family: var(--f-display);
  font-size: clamp(2.1rem, 1.4rem + 2.4vw, 3.2rem);
  line-height: .95;
  letter-spacing: -.02em;
  color: var(--ink);
}
.stat__val em { font-style: normal; color: var(--ember); }
.stat__lab { font-family: var(--f-mono); font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); max-width: 22ch; }

.statbar {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  padding-block: clamp(1.5rem, 3vw, 2.5rem);
  border-block: 1px solid var(--line);
}

/* --------------------------------------------------- 12. revision timeline */
.rev { border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; background: var(--paper-2); }
.rev__row {
  display: grid;
  grid-template-columns: 3.5rem 7rem minmax(0, 1fr);
  align-items: start;
  gap: 1rem;
  padding: 1.1rem clamp(1rem, 2vw, 1.5rem);
  border-bottom: 1px solid var(--line);
}
.rev__row:last-child { border-bottom: 0; }
.rev__row:nth-child(odd) { background: color-mix(in srgb, var(--paper-3) 45%, transparent); }
.rev__id { font-family: var(--f-mono); font-size: .78rem; font-weight: 600; color: var(--ember); padding-top: .15rem; }
.rev__when { font-family: var(--f-mono); font-size: .72rem; letter-spacing: .06em; color: var(--ink-3); padding-top: .25rem; }
.rev__what h3 { font-size: 1.05rem; margin-bottom: .2rem; }
.rev__where { font-family: var(--f-mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; color: var(--datum); margin-bottom: .5rem; }
.rev__what p { font-size: .93rem; color: var(--ink-2); margin: 0; }
.rev__head { background: var(--paper-3) !important; }
.rev__head span { font-family: var(--f-mono); font-size: .64rem; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-4); }
@media (max-width: 700px) {
  .rev__row { grid-template-columns: 2.5rem minmax(0, 1fr); gap: .5rem 1rem; }
  .rev__when { grid-column: 2; padding-top: 0; }
  .rev__what { grid-column: 2; }
  .rev__head { display: none; }
}

/* ----------------------------------------------------------- 13. quotation */
.saying {
  position: relative;
  padding: clamp(2rem, 4vw, 3.25rem) clamp(1.5rem, 4vw, 3.5rem);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--paper-2);
}
.saying__mark { width: 2.6rem; height: 2.6rem; color: var(--ember); opacity: .8; margin-bottom: 1.25rem; }
.saying q {
  display: block;
  font-family: var(--f-display);
  font-size: clamp(1.5rem, 1.1rem + 1.9vw, 2.5rem);
  line-height: 1.22;
  letter-spacing: -.015em;
  quotes: "\201C" "\201D";
  color: var(--ink);
}
.saying cite {
  display: block;
  margin-top: 1.35rem;
  font-family: var(--f-mono);
  font-size: .72rem;
  font-style: normal;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.saying cite b { color: var(--ember); font-weight: 500; }

/* --------------------------------------------------------- 14. title block */
.titleblock {
  border: 1px solid var(--line-2);
  border-radius: var(--r);
  background: var(--paper-2);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  overflow: hidden;
  font-family: var(--f-mono);
}
.titleblock__cell { padding: .7rem .9rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.titleblock__cell:last-child { border-right: 0; }
.titleblock__k { display: block; font-size: .58rem; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-4); margin-bottom: .25rem; }
.titleblock__v { font-size: .82rem; color: var(--ink); letter-spacing: .02em; }
.titleblock__v a { color: var(--ember); text-decoration: none; }

/* --------------------------------------------------------------- 15. footer */
.colophon {
  border-top: 1px solid var(--line);
  background: var(--paper-2);
  padding-block: clamp(3rem, 5vw, 4.5rem) 2rem;
  margin-top: clamp(3rem, 6vw, 6rem);
}
.colophon__grid { display: grid; gap: 2.5rem; }
@media (min-width: 860px) { .colophon__grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; } }
.colophon h4 { font-family: var(--f-mono); font-size: .66rem; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-4); margin-bottom: 1rem; font-weight: 500; }
.colophon ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .55rem; }
.colophon a { color: var(--ink-2); text-decoration: none; font-size: .92rem; }
.colophon a:hover { color: var(--ember); }
.colophon__legal {
  margin-top: 2.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
}

/* ------------------------------------------------------------ 16. workbench */
.bench-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(min(100%, 19rem), 1fr)); }

.tool {
  display: flex;
  flex-direction: column;
  gap: .7rem;
  padding: 1.35rem;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  text-decoration: none;
  color: inherit;
  position: relative;
  transition: all .26s var(--ease);
}
a.tool:hover { border-color: var(--ember); transform: translateY(-3px); box-shadow: var(--shadow-1); }
.tool__no { font-family: var(--f-mono); font-size: .66rem; letter-spacing: .14em; color: var(--ink-4); }
.tool__ico { width: 2rem; height: 2rem; color: var(--ember); }
.tool h3 { font-size: 1.05rem; margin: 0; }
.tool p { font-size: .89rem; color: var(--ink-2); margin: 0; flex: 1; }

/* Calculator shell */
.calc { display: grid; gap: 1.25rem; }
@media (min-width: 940px) { .calc { grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); align-items: start; } }

.field { display: grid; gap: .35rem; margin-bottom: 1rem; }
.field > label { font-family: var(--f-mono); font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); display: flex; justify-content: space-between; gap: .5rem; }
.field__hint { color: var(--ink-4); text-transform: none; letter-spacing: .02em; }
.field__row { display: flex; gap: .5rem; }
.field__row > :first-child { flex: 1; min-width: 0; }

input[type="text"], input[type="number"], input[type="email"], input[type="search"], select, textarea {
  width: 100%;
  font-family: var(--f-mono);
  font-size: .95rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line-2);
  border-radius: var(--r);
  padding: .62rem .75rem;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
select { font-family: var(--f-sans); font-size: .88rem; cursor: pointer; }
input:focus, select:focus, textarea:focus {
  outline: 0;
  border-color: var(--ember);
  box-shadow: 0 0 0 3px var(--ember-wash);
}
input[type="range"] { padding: 0; accent-color: var(--ember); border: 0; background: none; }
textarea { font-family: var(--f-sans); line-height: 1.6; resize: vertical; min-height: 8rem; }

.readout { display: grid; gap: 0; border: 1px solid var(--line-2); border-radius: var(--r); overflow: hidden; }
.readout__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: baseline;
  padding: .7rem .9rem;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.readout__row:last-child { border-bottom: 0; }
.readout__row--key { background: var(--ember-wash); }
.readout__lab { font-size: .85rem; color: var(--ink-2); }
.readout__val { font-family: var(--f-mono); font-size: 1rem; font-weight: 500; color: var(--ink); white-space: nowrap; }
.readout__row--key .readout__val { color: var(--ember); font-size: 1.15rem; }
.readout__val small { font-size: .72em; color: var(--ink-3); font-weight: 400; margin-left: .15em; }

.verdict {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .8rem 1rem;
  border-radius: var(--r);
  font-size: .9rem;
  border: 1px solid;
}
.verdict--ok   { color: var(--datum); border-color: color-mix(in srgb, var(--datum) 40%, transparent); background: var(--datum-wash); }
.verdict--warn { color: var(--brass); border-color: color-mix(in srgb, var(--brass) 40%, transparent); background: var(--brass-wash); }
.verdict--bad  { color: var(--ember); border-color: color-mix(in srgb, var(--ember) 40%, transparent); background: var(--ember-wash); }

.note {
  font-size: .82rem;
  line-height: 1.6;
  color: var(--ink-3);
  border-left: 2px solid var(--line-2);
  padding-left: .9rem;
}
.note strong { color: var(--ink-2); }

/* -------------------------------------------------------- 17. notes (blog) */
.notes-list { display: grid; gap: 0; }
.note-item {
  display: grid;
  gap: .35rem 1.75rem;
  grid-template-columns: minmax(0, 1fr);
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background .25s var(--ease);
}
@media (min-width: 780px) {
  .note-item { grid-template-columns: 8.5rem minmax(0, 1fr) auto; align-items: baseline; }
}
.note-item:hover { background: color-mix(in srgb, var(--paper-3) 55%, transparent); }
.note-item:hover .note-item__title { color: var(--ember); }
.note-item__date { font-family: var(--f-mono); font-size: .72rem; letter-spacing: .08em; color: var(--ink-4); }
.note-item__title { font-size: 1.2rem; font-weight: 600; letter-spacing: -.015em; margin: 0 0 .3rem; transition: color .2s var(--ease); }
.note-item__sum { font-size: .93rem; color: var(--ink-2); margin: 0; max-width: 62ch; }
.note-item__meta { display: flex; gap: .4rem; flex-wrap: wrap; margin-top: .6rem; }
.note-item__read { font-family: var(--f-mono); font-size: .68rem; letter-spacing: .1em; color: var(--ink-4); white-space: nowrap; }

.filters { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; justify-content: space-between; margin-bottom: 1.5rem; }
.search { position: relative; flex: 1 1 16rem; max-width: 22rem; }
.search input { padding-left: 2.2rem; font-family: var(--f-sans); }
.search svg { position: absolute; left: .7rem; top: 50%; transform: translateY(-50%); width: 1rem; height: 1rem; color: var(--ink-4); pointer-events: none; }

.archive-year { margin-top: 2.5rem; }
.archive-year > h3 {
  font-family: var(--f-mono);
  font-size: .8rem;
  letter-spacing: .18em;
  color: var(--ink-4);
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: .5rem;
}
.archive-year > h3::after { content: ""; flex: 1; height: 1px; background: var(--line); }

.post-head { border-bottom: 1px solid var(--line); padding-bottom: 2rem; margin-bottom: 2.5rem; }
.post-head h1 { font-size: clamp(2rem, 1.4rem + 2.6vw, 3.4rem); margin-bottom: .35em; }
.post-meta { display: flex; flex-wrap: wrap; gap: .5rem 1.25rem; align-items: center; }

.toc { position: sticky; top: 6rem; font-size: .88rem; }
.toc h4 { font-family: var(--f-mono); font-size: .64rem; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-4); margin-bottom: .8rem; }
.toc ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .5rem; border-left: 1px solid var(--line); }
.toc a { display: block; padding-left: .9rem; margin-left: -1px; border-left: 2px solid transparent; color: var(--ink-3); text-decoration: none; line-height: 1.35; }
.toc a:hover, .toc a[aria-current="true"] { color: var(--ember); border-left-color: var(--ember); }
.toc li.lvl-3 a { padding-left: 1.7rem; font-size: .93em; }

/* --------------------------------------------------------- 18. circle bench */
.circle-bench { display: grid; gap: 1.25rem; }
@media (min-width: 900px) { .circle-bench { grid-template-columns: minmax(0, 1fr) 19rem; align-items: start; } }
.circle-stage {
  position: relative;
  aspect-ratio: 1;
  max-height: 30rem;
  border: 1px solid var(--line-2);
  border-radius: var(--r-lg);
  background: var(--paper);
  overflow: hidden;
  touch-action: none;
  cursor: crosshair;
}
.circle-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.circle-stage__hint {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: .5rem;
  padding: 1.5rem;
  text-align: center;
  pointer-events: none;
  transition: opacity .3s var(--ease);
}
.circle-stage__hint svg {
  width: 2.2rem;
  height: 2.2rem;
  color: var(--line-3);
}
.circle-stage__hint .anno { max-width: 24ch; }
.circle-score {
  font-family: var(--f-display);
  font-size: clamp(3rem, 2rem + 5vw, 5rem);
  line-height: .9;
  letter-spacing: -.03em;
}
.circle-score small { font-size: .3em; font-family: var(--f-mono); letter-spacing: .1em; color: var(--ink-3); }

/* Diagram plates carry their own light paper field, so take the edge off them
   in the dark theme rather than letting a white rectangle glare. */
[data-theme="viewport"] .plate img,
[data-theme="viewport"] .card__media img { filter: brightness(.9) saturate(.94); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="vellum"]) .plate img,
  :root:not([data-theme="vellum"]) .card__media img { filter: brightness(.9) saturate(.94); }
}

/* ----------------------------------------------------------- 19. utilities */
.center { text-align: center; }
.mx-auto { margin-inline: auto; }
.muted { color: var(--ink-3); }
.ember { color: var(--ember); }
.datum { color: var(--datum); }
.nowrap { white-space: nowrap; }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: .75rem; }
.mt-2 { margin-top: 1.5rem; }
.mt-3 { margin-top: 2.5rem; }
.mb-0 { margin-bottom: 0; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.full-bleed { width: 100vw; margin-inline: calc(50% - 50vw); }

/* ------------------------------------------------------------- 20. motion */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
  transition-delay: var(--delay, 0s);
}
[data-reveal].is-in { opacity: 1; transform: 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-reveal] { opacity: 1; transform: none; }
  .hero__circle .draw { stroke-dashoffset: 0; }
  .hero__circle .hub, .hero__circle .cross { opacity: 1; }
}

/* --------------------------------------------------------------- 21. print */
@media print {
  body::before, .masthead, .colophon, .ticker, .circle-bench { display: none !important; }
  body { background: #fff; color: #000; }
  a { text-decoration: underline; }
  .panel, .card, .rev { border-color: #bbb; }
}