/* Generated by _styles/v5/_build.py: base.css + paper.css + present.css. Edit those, then rerun it. */
/* ==========================================================================
   base.css — structure only.
   Every look-and-feel decision is a custom property set by css/<theme>.css,
   so the three styles share identical HTML and differ only here.
   ========================================================================== */

:root {
  /* colour */
  --bg: #fff; --bg-band: #f5f5f5; --surface: #fff;
  --ink: #111; --muted: #555; --faint: #6f6f6f;
  --rule: #ddd; --rule-strong: #111;
  --accent: #b02; --accent-soft: rgba(176, 0, 34, .07); --on-accent: #fff; --focus: #b02;
  --loop-color: var(--accent);
  --fig-color: var(--ink); --neg: var(--accent); --accent-loud: var(--accent); --loop-ink: var(--loop-color);

  /* type */
  --f-display: Georgia, serif; --f-body: Georgia, serif; --f-mono: ui-monospace, monospace;
  --f-q: var(--f-body); --f-fig: var(--f-mono); --f-title: var(--f-display); --f-cjk: serif;
  --w-name: 500; --w-verb: 500; --w-title: 500; --w-fig: 500; --w-label: 600;
  --track-name: -.02em; --track-verb: -.02em; --track-label: .16em;
  --case-verb: none; --style-q: normal;
  --body-size: 1.0625rem; --lh-body: 1.62;
  --name-size: clamp(3rem, 8vw, 6rem);
  --lede-size: clamp(1.2rem, 2.1vw, 1.55rem);
  --verb-size: clamp(2.4rem, 5.2vw, 4.4rem);
  --q-size: 1.06rem; --fig-size: 1.45rem;
  --card-fig-size: clamp(2.6rem, 5vw, 3.8rem);
  --thread-verb-size: clamp(4rem, 13vw, 10rem);
  --title-size: 1.16rem;

  /* shape */
  --radius: 3px; --rule-w: 1px; --rule-strong-w: 1.5px;
  --loop-w: 1.5px; --loop-r: 10px;
  --card-bg: transparent; --card-border: 0 solid transparent; --card-top: var(--rule-w) solid var(--rule);
  --card-radius: 0; --card-pad: 26px 0 0; --cards-gap: 52px 56px;

  /* layout */
  --page-max: 1180px; --gutter: clamp(20px, 4.5vw, 56px); --section-gap: clamp(64px, 9vw, 112px);
  --bracket-w: 46px; --verb-w-k: 3.95; --fig-col: 15.5rem; --arm-k: .5; --item-pad: 26px;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--f-body); font-size: var(--body-size); line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility; font-feature-settings: "kern" 1;
}
h1, h2, h3, p, ol, ul { margin: 0; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration-thickness: from-font; text-underline-offset: .18em; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 2px; }
main:focus { outline: none; }
[hidden] { display: none !important; }
sup { font-size: .7em; line-height: 0; }

.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: -9999px; top: 10px; z-index: 50; background: var(--ink); color: var(--bg); padding: 9px 14px; text-decoration: none; font-family: var(--f-mono); font-size: .8rem; }
.skip:focus { left: var(--gutter); }

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

/* ---------- shared bits ---------- */
.label {
  display: flex; align-items: baseline; justify-content: space-between; gap: 8px 20px; flex-wrap: wrap;
  font-family: var(--f-mono); font-size: .7rem; font-weight: var(--w-label);
  letter-spacing: var(--track-label); text-transform: uppercase; color: var(--muted);
  margin-bottom: 22px;
}
.label__aside { font-weight: 400; letter-spacing: .08em; color: var(--faint); text-decoration: none; }
a.label__aside:hover { color: var(--ink); }

.links { display: flex; flex-wrap: wrap; gap: 4px 16px; margin-top: 12px; font-family: var(--f-mono); font-size: .74rem; letter-spacing: .04em; }
.links a { text-decoration: none; color: var(--muted); border-bottom: var(--rule-w) solid var(--rule); padding-bottom: 1px; }
.links a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.links--plain { font-size: .8rem; }
.links--plain a { color: var(--ink); }

.venue {
  display: inline-block; font-family: var(--f-mono); font-size: .74rem; font-weight: 700; line-height: 1.2;
  letter-spacing: .03em; color: var(--accent); background: var(--accent-soft);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 24%, transparent);
  padding: 5px 10px; border-radius: var(--radius); white-space: nowrap;
}

.scope {
  margin-top: 14px; padding: 10px 0 10px 14px; border-left: 2px solid var(--accent);
  font-size: .9rem; line-height: 1.55; color: var(--muted);
}
.scope b {
  font-family: var(--f-mono); font-size: .66rem; font-weight: 600; letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent); margin-right: .6em;
}

/* ---------- header / footer ---------- */
.site-head { border-bottom: var(--rule-w) solid var(--rule); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px 32px; padding-block: 18px; }
.brand { font-family: var(--f-mono); font-size: .76rem; font-weight: 600; letter-spacing: .16em; text-transform: uppercase; text-decoration: none; }
.brand span { font-family: var(--f-cjk); letter-spacing: .1em; font-weight: 500; color: var(--muted); margin-left: .7em; text-transform: none; }
.nav { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 22px; font-family: var(--f-mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; }
.nav a { text-decoration: none; color: var(--muted); padding: 5px 0; border-bottom: var(--rule-strong-w) solid transparent; }
.nav a:hover { color: var(--ink); }
.nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--accent); }
.nav__sep { width: var(--rule-w); height: 14px; background: var(--rule); }

.site-foot { margin-top: var(--section-gap); border-top: var(--rule-w) solid var(--rule); }
.site-foot .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 6px 24px; padding-block: 26px 90px; font-family: var(--f-mono); font-size: .72rem; letter-spacing: .04em; color: var(--faint); }
.site-foot a { color: var(--muted); }

/* ---------- hero ---------- */
.hero { padding-top: clamp(48px, 8vw, 96px); display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 28px clamp(32px, 5vw, 72px); align-items: end; }
.hero__photo { width: clamp(150px, 16vw, 216px); aspect-ratio: 1; object-fit: cover; border-radius: var(--photo-radius, 2px); filter: var(--photo-filter, none); }
/* the 3D depth portrait (assets/portrait3d.js): a cut-out canvas over the photo, which shows until it is ready */
.hero__photo.portrait3d { position: relative; width: clamp(240px, 27vw, 380px); border-radius: 0; filter: none; }
.portrait3d img { display: block; width: 100%; height: 100%; object-fit: cover; border-radius: var(--photo-radius, 2px); filter: var(--photo-filter, none); transition: opacity .6s; }
.portrait3d__canvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; transition: opacity .9s; }
.portrait3d.is-3d img { opacity: 0; }
.portrait3d.is-3d .portrait3d__canvas { opacity: 1; }
.portrait3d__slogan { position: absolute; right: 2%; bottom: -15%; margin: 0; white-space: nowrap; pointer-events: none; font-family: "Caveat", cursive; font-weight: 700; font-size: clamp(26px, 2.6vw, 40px); line-height: 1; color: var(--ink); transform: rotate(-4deg); opacity: 0; transition: opacity 1s .5s; }
.portrait3d.is-3d .portrait3d__slogan { opacity: 1; }
.kicker { font-family: var(--f-mono); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin-bottom: 22px; }
.kicker a { color: var(--ink); }
.name { font-family: var(--f-display); font-weight: var(--w-name); font-size: var(--name-size); line-height: .9; letter-spacing: var(--track-name); }
.name__cjk { font-family: var(--f-cjk); font-weight: 500; font-size: .34em; letter-spacing: .16em; color: var(--muted); margin-left: .5em; vertical-align: .32em; }
.lede { font-family: var(--f-q); font-size: var(--lede-size); line-height: 1.38; max-width: 36ch; margin-top: 28px; color: var(--ink); }

/* ---------- the loop ---------- */
.loop { margin-top: var(--section-gap); }
.loop__list { list-style: none; padding: 0; border-top: var(--rule-strong-w) solid var(--rule-strong); }
.loop__item {
  --verb-col: calc(var(--verb-size) * var(--verb-w-k));
  position: relative; display: grid;
  grid-template-columns: 2.4rem minmax(0, var(--verb-col)) minmax(0, 1fr) minmax(0, var(--fig-col));
  grid-template-areas: "n verb q fig";
  column-gap: clamp(16px, 2.4vw, 34px); align-items: baseline;
  padding: var(--item-pad) 0 var(--item-pad) var(--bracket-w);
  border-bottom: var(--rule-w) solid var(--rule);
}
.loop__n { grid-area: n; font-family: var(--f-mono); font-size: .74rem; font-weight: 600; color: var(--accent); letter-spacing: .04em; }
.loop__verb {
  grid-area: verb; font-family: var(--f-display); font-weight: var(--w-verb); font-size: var(--verb-size);
  line-height: 1; letter-spacing: var(--track-verb); text-transform: var(--case-verb);
  text-decoration: none; display: inline-flex; align-items: baseline; gap: .18em; width: fit-content;
}
.loop__go { font-family: var(--f-mono); font-size: .32em; color: var(--accent); opacity: 0; transform: translateX(-.4em); transition: opacity .2s, transform .2s; }
.loop__verb:hover .loop__go, .loop__verb:focus-visible .loop__go { opacity: 1; transform: none; }
.loop__verb:hover { color: var(--accent); }
.loop__q { grid-area: q; font-family: var(--f-q); font-style: var(--style-q); font-size: var(--q-size); line-height: 1.5; color: var(--muted); max-width: 40ch; }
.loop__fig { grid-area: fig; font-family: var(--f-fig); display: flex; flex-direction: column; gap: 5px; text-align: right; }
.loop__fig b { font-weight: var(--w-fig); font-size: var(--fig-size); line-height: 1; color: var(--fig-color); font-variant-numeric: tabular-nums lining-nums; letter-spacing: -.01em; }
.loop__fig span { font-family: var(--f-mono); font-size: .7rem; line-height: 1.45; letter-spacing: .02em; color: var(--faint); }

/* The return leg is drawn on the items themselves, one segment each, so it
   stays continuous whatever height a row grows to. It runs from 03 back up to 01. */
.loop__item::before {
  content: ""; position: absolute; left: 4px; width: calc(var(--bracket-w) - 16px);
  border: 0 solid var(--loop-color); border-left-width: var(--loop-w);
  transform-origin: bottom; animation: loop-draw .5s cubic-bezier(.5, 0, .2, 1) both;
}
.loop__item:first-child::before {
  top: calc(var(--item-pad) + var(--verb-size) * var(--arm-k)); bottom: calc(var(--rule-w) * -1);
  border-top-width: var(--loop-w); border-top-left-radius: var(--loop-r); animation-delay: 1s;
}
.loop__item:not(:first-child):not(:last-child)::before { top: 0; bottom: calc(var(--rule-w) * -1); animation-delay: .5s; }
.loop__item:last-child::before {
  top: 0; height: calc(var(--item-pad) + var(--verb-size) * var(--arm-k));
  border-bottom-width: var(--loop-w); border-bottom-left-radius: var(--loop-r); animation-delay: 0s;
}
.loop__item:first-child::after {
  --ah: calc(var(--loop-w) * 2 + 3px);
  content: ""; position: absolute; width: 0; height: 0;
  left: calc(var(--bracket-w) - 13px);
  top: calc(var(--item-pad) + var(--verb-size) * var(--arm-k) + var(--loop-w) / 2 - var(--ah));
  border-top: var(--ah) solid transparent; border-bottom: var(--ah) solid transparent;
  border-left: calc(var(--ah) * 1.3) solid var(--loop-color);
  animation: loop-fade .3s ease 1.5s both;
}
@keyframes loop-draw { from { transform: scaleY(0); } to { transform: scaleY(1); } }
@keyframes loop-fade { from { opacity: 0; } to { opacity: 1; } }

.loop__return { display: flex; gap: 12px; align-items: baseline; margin-top: 18px; padding-left: 4px; font-size: .95rem; line-height: 1.5; color: var(--muted); max-width: 70ch; }
.loop__return-mark { font-family: var(--f-mono); color: var(--loop-ink); font-size: 1.05rem; width: calc(var(--bracket-w) - 4px); flex: 0 0 auto; }
.loop__return b { color: var(--ink); font-weight: 600; }
.loop__ground { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 10px; margin-top: 18px; padding-left: var(--bracket-w); font-family: var(--f-mono); font-size: .72rem; letter-spacing: .04em; color: var(--faint); }
.loop__ground-k { margin-right: 6px; }
.loop__ground-now { margin-left: 10px; color: var(--ink); font-weight: 600; letter-spacing: .02em; }
.loop__ground span:not(.loop__ground-k):not(.loop__ground-now) { color: var(--ink); background: var(--accent-soft); padding: 4px 8px; border-radius: var(--radius); }

/* ---------- selected results ---------- */
.results, .also, .recent, .coda { margin-top: var(--section-gap); }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--cards-gap); }
.card { background: var(--card-bg); border: var(--card-border); border-top: var(--card-top); border-radius: var(--card-radius); padding: var(--card-pad); }
.card__tag { font-family: var(--f-mono); font-size: .7rem; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; }
.card__tag a { color: var(--accent); text-decoration: none; }
.card__fig { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 14px; margin-top: 18px; }
.card__fig b { font-family: var(--f-fig); font-weight: var(--w-fig); font-size: var(--card-fig-size); line-height: .95; letter-spacing: -.03em; font-variant-numeric: tabular-nums lining-nums; color: var(--fig-color); }
.card__fig.is-neg b { color: var(--neg); }
.card__fig span { font-family: var(--f-mono); font-size: .74rem; letter-spacing: .03em; color: var(--faint); }
.card__title { margin-top: 20px; font-family: var(--f-title); font-weight: var(--w-title); font-size: 1.3rem; line-height: 1.2; letter-spacing: -.01em; }
.card__title a { text-decoration: none; }
.card__title a:hover { color: var(--accent); }
.card__authors { margin-top: 8px; font-size: .86rem; line-height: 1.5; color: var(--muted); }
.card__authors .me { color: var(--ink); font-weight: 600; }
.card__meta { display: flex; flex-wrap: wrap; gap: 2px 12px; margin-top: 6px; font-family: var(--f-mono); font-size: .7rem; letter-spacing: .04em; color: var(--muted); }
.card__meta span:not(:last-child)::after { content: " ·"; color: var(--faint); }
.card__claim { margin-top: 14px; font-size: .98rem; line-height: 1.6; color: var(--ink); max-width: 52ch; }

/* ---------- also ---------- */
.also__list { list-style: none; padding: 0; border-top: var(--rule-w) solid var(--rule); }
.also__list li {
  display: grid; grid-template-columns: minmax(0, 11rem) minmax(0, 1fr) minmax(0, 13rem);
  gap: 4px 24px; align-items: baseline; padding: 14px 0; border-bottom: var(--rule-w) solid var(--rule);
}
.also__name { font-family: var(--f-title); font-weight: var(--w-title); font-size: 1.04rem; text-decoration: none; }
.also__name:hover { color: var(--accent); }
.also__t { color: var(--muted); font-size: .92rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.also__v { font-family: var(--f-mono); font-size: .7rem; letter-spacing: .03em; color: var(--muted); text-align: right; }

/* ---------- recent ---------- */
.recent__list { list-style: none; padding: 0; border-top: var(--rule-w) solid var(--rule); }
.recent__list li { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr); gap: 4px 24px; padding: 12px 0; border-bottom: var(--rule-w) solid var(--rule); align-items: baseline; }
.recent__list time { font-family: var(--f-mono); font-size: .72rem; letter-spacing: .06em; color: var(--accent); }
.recent__list span { font-size: .98rem; }
.news-list { border-top: 0; }
.news-list li { grid-template-columns: 3rem minmax(0, 1fr); }
.news-list li:first-child { padding-top: 14px; }

/* ---------- coda ---------- */
.coda { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 40px 72px; border-top: var(--rule-strong-w) solid var(--rule-strong); padding-top: 34px; }
.coda p { font-size: 1rem; line-height: 1.62; max-width: 58ch; }
.coda p + p { margin-top: 10px; }

/* ---------- thread pages ---------- */
.thread-head { padding-top: clamp(36px, 6vw, 72px); }
.steps { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 26px; font-family: var(--f-mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; padding-bottom: 14px; border-bottom: var(--rule-w) solid var(--rule); }
.steps a { color: var(--muted); text-decoration: none; display: inline-flex; gap: 8px; }
.steps a span { color: var(--faint); }
.steps a[aria-current="step"] { color: var(--ink); }
.steps a[aria-current="step"] span { color: var(--accent); }
.steps__ret { color: var(--loop-ink); margin-left: auto; font-size: .95rem; }
.thread-n { margin-top: clamp(40px, 7vw, 80px); font-family: var(--f-mono); font-size: .78rem; font-weight: 600; letter-spacing: .12em; color: var(--accent); }
.thread-verb { margin-top: 6px; font-family: var(--f-display); font-weight: var(--w-verb); font-size: var(--thread-verb-size); line-height: .86; letter-spacing: var(--track-verb); text-transform: var(--case-verb); }
.thread-q { margin-top: 30px; font-family: var(--f-q); font-style: var(--style-q); font-size: clamp(1.3rem, 2.6vw, 1.9rem); line-height: 1.3; max-width: 32ch; }
.thread-desc { margin-top: 18px; font-size: 1.04rem; color: var(--muted); max-width: 60ch; }

.works-sec { margin-top: clamp(48px, 7vw, 80px); }
.works { border-top: var(--rule-strong-w) solid var(--rule-strong); }
.work { display: grid; grid-template-columns: minmax(0, 15rem) minmax(0, 1fr); gap: 14px clamp(24px, 4vw, 56px); padding: 30px 0; border-bottom: var(--rule-w) solid var(--rule); }
.work__venue { line-height: 1; }
.work__venue .venue { font-size: .8rem; padding: 6px 11px; }
.work__title { font-family: var(--f-title); font-weight: var(--w-title); font-size: var(--title-size); line-height: 1.3; letter-spacing: -.008em; }
.work__title a { text-decoration: none; }
.work__title a:hover { color: var(--accent); }
.work__authors { margin-top: 8px; font-size: .88rem; color: var(--muted); }
.work__authors .me, .pub__authors .me { color: var(--ink); font-weight: 600; }
.work__claim { margin-top: 12px; font-size: 1rem; line-height: 1.62; max-width: 64ch; }

.thread-also { margin-top: 48px; }
.thread-also ul { list-style: none; padding: 0; }
.thread-also li { padding: 10px 0; border-bottom: var(--rule-w) solid var(--rule); font-size: .95rem; }
.thread-also li a { font-family: var(--f-title); font-weight: var(--w-title); margin-right: 10px; }
.thread-also li span { color: var(--muted); }

.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 64px; }
.pager a { display: flex; flex-direction: column; gap: 8px; padding: 22px 0; border-top: var(--rule-strong-w) solid var(--rule-strong); text-decoration: none; }
.pager span { font-family: var(--f-mono); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; color: var(--faint); }
.pager b { font-family: var(--f-display); font-weight: var(--w-verb); font-size: clamp(1.6rem, 3.4vw, 2.6rem); line-height: 1; letter-spacing: var(--track-verb); text-transform: var(--case-verb); }
.pager a:hover b { color: var(--accent); }
.pager__next { text-align: right; align-items: flex-end; }

/* ---------- publications ---------- */
.plain-head { padding-top: clamp(40px, 6vw, 80px); }
.plain-h1 { font-family: var(--f-display); font-weight: var(--w-name); font-size: clamp(2.8rem, 7vw, 5.2rem); line-height: .95; letter-spacing: var(--track-name); }
.plain-sub { margin-top: 16px; color: var(--muted); max-width: 64ch; font-size: .98rem; }
.filter { display: none; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.js .filter { display: flex; }
.filter button {
  font: 500 .74rem/1 var(--f-mono); letter-spacing: .06em; color: var(--muted); background: transparent;
  border: var(--rule-w) solid var(--rule); border-radius: var(--radius); padding: 9px 13px; cursor: pointer;
}
.filter button:hover { color: var(--ink); border-color: var(--ink); }
.filter button[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.pubs-wrap { margin-top: 44px; }
.year { display: grid; grid-template-columns: minmax(0, 7rem) minmax(0, 1fr); gap: 0 32px; border-top: var(--rule-strong-w) solid var(--rule-strong); }
.year + .year { margin-top: 26px; }
.year__h { padding-top: 22px; font-family: var(--f-mono); font-size: 1rem; font-weight: 600; letter-spacing: .02em; position: sticky; top: 0; align-self: start; }
.pubs { list-style: none; padding: 0; }
.pub { padding: 22px 0; border-bottom: var(--rule-w) solid var(--rule); }
.pub:last-child { border-bottom: 0; }
.pub__top { display: flex; align-items: flex-start; justify-content: space-between; gap: 8px 20px; flex-wrap: wrap; }
.pub__top .venue { flex: 0 0 auto; margin-top: 2px; }
.pub__title { flex: 1 1 60%; min-width: 0; font-family: var(--f-title); font-weight: var(--w-title); font-size: 1.08rem; line-height: 1.32; }
.pub__title a { text-decoration: none; }
.pub__title a:hover { color: var(--accent); }
.pub__authors { margin-top: 6px; font-size: .86rem; color: var(--muted); }
.pub__meta { display: flex; flex-wrap: wrap; gap: 4px 14px; margin-top: 8px; font-family: var(--f-mono); font-size: .7rem; letter-spacing: .04em; color: var(--muted); }
.pub__thread { color: var(--faint); }
.pub .links { margin-top: 8px; }
.pubs-note { margin-top: 30px; font-size: .9rem; color: var(--muted); }

/* ---------- about ---------- */
.about-head { display: grid; grid-template-columns: minmax(0, 200px) minmax(0, 1fr); gap: 28px clamp(28px, 5vw, 64px); align-items: start; }
.portrait { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: var(--radius); }
.about-bio { margin-top: 20px; font-size: 1.04rem; line-height: 1.65; max-width: 64ch; }
.about-bio + .about-bio { margin-top: 12px; }
.about-body > section { margin-top: 56px; }
.row { display: grid; grid-template-columns: minmax(0, 11rem) minmax(0, 1fr); gap: 4px 32px; padding: 14px 0; border-bottom: var(--rule-w) solid var(--rule); }
.about-body .label + .row { border-top: var(--rule-w) solid var(--rule); }
.row__k { font-family: var(--f-mono); font-size: .72rem; letter-spacing: .04em; color: var(--muted); padding-top: 3px; }
.row__v { font-size: .98rem; line-height: 1.6; }
.row__v b { font-weight: 600; }

/* ---------- preview controls (not shipped) ---------- */
.preview {
  position: fixed; right: 16px; bottom: 16px; z-index: 40; display: flex; align-items: center; flex-wrap: wrap; gap: 3px;
  padding: 5px; background: #111; border-radius: 14px; box-shadow: 0 8px 30px rgba(0, 0, 0, .28);
  font: 500 .7rem/1 ui-monospace, "SF Mono", Menlo, monospace; max-width: calc(100vw - 32px);
}
.preview__k { color: #9a9a9a; padding: 0 6px 0 9px; letter-spacing: .08em; text-transform: uppercase; font-size: .6rem; }
.preview__sep { width: 1px; height: 18px; background: #3a3a3a; margin: 0 4px; }
.preview a, .preview button { font: inherit; color: #cfcfcf; background: transparent; border: 0; border-radius: 9px; padding: 8px 10px; cursor: pointer; text-decoration: none; }
.preview a[aria-current="page"], .preview button[aria-pressed="true"] { background: #fff; color: #111; }
.preview a:focus-visible, .preview button:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .loop__item {
    grid-template-columns: 2.2rem minmax(0, 1fr) minmax(0, 12rem);
    grid-template-areas: "n verb verb" ". q fig";
    row-gap: 12px;
  }
  .loop__q { max-width: none; }
  .also__list li { grid-template-columns: minmax(0, 10rem) minmax(0, 1fr); }
  .also__t { grid-column: 2; }
  .also__v { grid-column: 2; text-align: left; }
}
@media (max-width: 720px) {
  :root { --bracket-w: 30px; --item-pad: 20px; }
  .loop__item { grid-template-columns: 1.9rem minmax(0, 1fr); grid-template-areas: "n verb" ". q" ". fig"; row-gap: 10px; }
  .loop__item::before { width: calc(var(--bracket-w) - 10px); left: 2px; }
  .loop__item:first-child::after { left: calc(var(--bracket-w) - 9px); }
  .hero { grid-template-columns: minmax(0, 1fr); }
  .hero__photo { order: -1; width: 92px; }
  .hero__photo.portrait3d { width: min(78vw, 320px); justify-self: center; margin-bottom: 44px; }
  .site-foot .wrap { padding-block: 22px 32px; }
  .portrait3d__slogan { right: 0; bottom: -40px; }
  .loop__fig { text-align: left; flex-direction: row; align-items: baseline; flex-wrap: wrap; gap: 4px 10px; }
  .loop__ground { padding-left: 0; }
  .cards { grid-template-columns: minmax(0, 1fr); }
  .also__list li { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .also__t, .also__v { grid-column: 1; grid-row: auto; text-align: left; white-space: normal; }
  .recent__list li { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .news-list li { grid-template-columns: 2.6rem minmax(0, 1fr); gap: 2px 14px; }
  .coda { grid-template-columns: minmax(0, 1fr); }
  .work { grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .pager { grid-template-columns: minmax(0, 1fr); }
  .pager__next { text-align: left; align-items: flex-start; }
  .year { grid-template-columns: minmax(0, 1fr); }
  .year__h { position: static; padding-top: 16px; }
  .about-head { grid-template-columns: minmax(0, 1fr); }
  .portrait { max-width: 160px; }
  .row { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .steps__ret { margin-left: 0; }
  .site-head .wrap { gap: 10px 20px; }
  .nav { gap: 4px 16px; }
  .preview { left: 16px; right: 16px; bottom: 12px; justify-content: center; }
}
@media (prefers-reduced-motion: reduce) {
  .loop__item::before, .loop__item:first-child::after { animation: none; }
  .loop__go { transition: none; }
}

/* light / dark switch in the footer (production only) */
.mode-switch { display: none; gap: 2px; align-items: center; font-family: var(--f-mono); font-size: .68rem; letter-spacing: .06em; text-transform: uppercase; }
.js .mode-switch { display: inline-flex; }
.mode-switch span { color: var(--faint); margin-right: 6px; }
.mode-switch button { font: inherit; letter-spacing: inherit; text-transform: inherit; color: var(--muted); background: none; border: var(--rule-w) solid transparent; border-radius: var(--radius); padding: 3px 7px; cursor: pointer; }
.mode-switch button:hover { color: var(--ink); }
.mode-switch button[aria-pressed="true"] { color: var(--ink); border-color: var(--rule); background: var(--surface); }

/* Paper — a scholarly page. Warm stock, one serif for argument, a mono for the record,
   oxide red rationed to the loop and to what a claim does not cover. */
html[data-theme="paper"] {
  color-scheme: light;
  --photo-radius: 2px; --photo-filter: saturate(.92) contrast(1.02);
  --bg: #F5F1E8; --bg-band: #EEE9DD; --surface: #FBF9F4;
  --ink: #17150F; --muted: #55514A; --faint: #6B675E;
  --rule: #D8D1C2; --rule-strong: #17150F;
  --accent: #A3361B; --accent-soft: rgba(163, 54, 27, .075); --focus: #A3361B;
  --loop-color: #A3361B; --fig-color: #17150F; --neg: #A3361B;

  --f-display: "Newsreader", Georgia, serif; --f-body: "Newsreader", Georgia, serif;
  --f-q: "Newsreader", Georgia, serif; --f-title: "Newsreader", Georgia, serif;
  --f-fig: "Newsreader", Georgia, serif; --f-mono: "IBM Plex Mono", ui-monospace, monospace;
  --f-cjk: "Noto Serif SC", "Songti SC", serif;
  --w-name: 500; --w-verb: 500; --w-title: 500; --w-fig: 500;
  --track-name: -.04em; --track-verb: -.03em;
  --style-q: italic;
  --body-size: 1.125rem;
  --name-size: clamp(3.6rem, 9.4vw, 7.6rem);
  --lede-size: clamp(1.3rem, 2.3vw, 1.7rem);
  --verb-size: clamp(2.6rem, 5.6vw, 4.7rem);
  --q-size: 1.2rem; --fig-size: 1.9rem;
  --card-fig-size: clamp(3.2rem, 6vw, 4.8rem);
  --thread-verb-size: clamp(3.4rem, 14vw, 11rem);
  --title-size: 1.24rem;
  --verb-w-k: 5.0; --arm-k: .55;
}
html[data-theme="paper"] .lede { color: var(--ink); }
html[data-theme="paper"] .card__claim,
html[data-theme="paper"] .work__claim { font-size: 1.06rem; }
html[data-theme="paper"] .loop__fig b,
html[data-theme="paper"] .card__fig b { font-feature-settings: "lnum" 1, "tnum" 1; }
html[data-theme="paper"] .scope { font-style: italic; }
html[data-theme="paper"] .scope b { font-style: normal; }
html[data-theme="paper"] .site-head { border-bottom-color: var(--rule-strong); }
/* Newsreader's capitals rise above a tight line box; give the label above room to clear them */
html[data-theme="paper"] .thread-verb { margin-top: .17em; }

/* Dark Paper. Follows the system unless the reader picked one: the footer switch sets
   data-mode="light" or "dark" on <html>, and without it the media query decides. */
html[data-theme="paper"][data-mode="dark"] {
  color-scheme: dark;
  --photo-filter: saturate(.88) brightness(.9);
  --bg: #16140F; --bg-band: #1C1A14; --surface: #1F1C16;
  --ink: #ECE6D9; --muted: #BDB4A3; --faint: #A39A88;
  --rule: #38342B; --rule-strong: #ECE6D9;
  --accent: #E38A69; --accent-soft: rgba(227, 138, 105, .1); --focus: #E38A69;
  --loop-color: #E38A69; --fig-color: #ECE6D9; --neg: #E38A69;
}
@media (prefers-color-scheme: dark) {
  html[data-theme="paper"]:not([data-mode="light"]) {
    color-scheme: dark;
    --photo-filter: saturate(.88) brightness(.9);
    --bg: #16140F; --bg-band: #1C1A14; --surface: #1F1C16;
    --ink: #ECE6D9; --muted: #BDB4A3; --faint: #A39A88;
    --rule: #38342B; --rule-strong: #ECE6D9;
    --accent: #E38A69; --accent-soft: rgba(227, 138, 105, .1); --focus: #E38A69;
    --loop-color: #E38A69; --fig-color: #ECE6D9; --neg: #E38A69;
  }
}

/* ==========================================================================
   present.css — three home-page presentations of the loop: ring, track, scroll.
   Colour and type come only from palette tokens, so any palette fits any layout.
   ========================================================================== */

/* ---------- the ring drawing (ring + scroll) ---------- */
.ring__fig { position: relative; width: 100%; max-width: 420px; aspect-ratio: 1; margin-inline: auto; }
.ring__svg { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.ring__track { fill: none; stroke: var(--rule); stroke-width: 1px; vector-effect: non-scaling-stroke; }
.ring__leg { fill: none; stroke: var(--ink); stroke-width: var(--ring-w, 1.5px); vector-effect: non-scaling-stroke; transition: opacity .45s, stroke .45s; }
.ring__leg--ret { stroke: var(--loop-color); stroke-width: calc(var(--loop-w) + 1px); }
.ring__ah { fill: var(--ink); }
.ring__ah--ret { fill: var(--loop-color); }
.ring__node { transition: opacity .45s; }
.ring__node circle { fill: var(--node-bg, var(--bg)); stroke: var(--ink); stroke-width: var(--ring-w, 1.5px); vector-effect: non-scaling-stroke; transition: fill .35s, stroke .35s; }
.ring__node text { font-family: var(--f-mono); font-size: 13px; font-weight: 700; text-anchor: middle; fill: var(--ink); transition: fill .35s; }
.ring__arclabel { font-family: var(--f-mono); font-size: 11.5px; font-weight: 500; letter-spacing: .06em; fill: var(--loop-ink); }
.ring__dot { fill: var(--loop-color); transition: opacity .45s; }
.ring__center { position: absolute; inset: 24%; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; }
.ring__k { font-family: var(--f-mono); font-size: .62rem; font-weight: 600; letter-spacing: .18em; text-transform: uppercase; color: var(--faint); }
.ring__k--now { color: var(--accent); }
.ring__v { margin-top: 4px; font-family: var(--f-q); font-size: .96rem; line-height: 1.3; color: var(--muted); text-wrap: balance; }
.ring__v--now { color: var(--ink); font-weight: 600; }
.ring__rule { width: 34px; height: var(--rule-w); background: var(--rule-strong); opacity: .5; margin: 12px 0 10px; }

/* ---------- thread labels around the ring ---------- */
.tl__n { font-family: var(--f-mono); font-size: .72rem; font-weight: 700; letter-spacing: .1em; color: var(--accent); }
.tl__verb {
  display: inline-block; margin-top: 4px; font-family: var(--f-display); font-weight: var(--w-verb);
  font-size: var(--tl-verb, clamp(2.1rem, 3.4vw, 3.1rem)); line-height: 1; letter-spacing: var(--track-verb);
  text-transform: var(--case-verb); text-decoration: none;
}
.tl__verb:hover { color: var(--accent); }
.tl__q { text-wrap: pretty; margin-top: 12px; font-family: var(--f-q); font-style: var(--style-q); font-size: 1.02rem; line-height: 1.45; color: var(--muted); }
.tl__fig { margin-top: 12px; font-family: var(--f-mono); font-size: .7rem; line-height: 1.4; color: var(--faint); }
.tl__fig b { display: block; font-family: var(--f-fig); font-size: 1.5rem; font-weight: var(--w-fig); line-height: 1.05; color: var(--fig-color); letter-spacing: -.01em; margin-bottom: 3px; font-variant-numeric: tabular-nums lining-nums; }

/* ---------- RING layout ---------- */
.ring { margin-top: var(--section-gap); }
.ring__stage { display: flex; flex-direction: column; align-items: center; }
.tl--measure { text-align: center; max-width: 28rem; margin-bottom: 26px; }
.tl--measure .tl__q { margin-inline: auto; max-width: 24rem; }
.ring__orbit { position: relative; width: min(420px, 100%); margin-bottom: 96px; }
.tl--train, .tl--coordinate { position: absolute; top: 60%; width: min(290px, calc((100vw - 420px) / 2 - 120px)); }
.tl--train { left: calc(100% + 34px); }
.tl--coordinate { right: calc(100% + 34px); text-align: right; }
.ring__return { margin: 30px auto 0; max-width: 46rem; text-align: center; font-size: .98rem; color: var(--muted); }
.ring__return b { color: var(--loop-ink); font-weight: 600; }
.ring__return span { color: var(--loop-ink); margin-right: 4px; }

/* ---------- readings (ring) ---------- */
.readings { margin-top: var(--section-gap); }
.readings__row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: var(--rule-strong-w) solid var(--rule-strong); }
.reading { display: flex; flex-direction: column; gap: 4px; padding: 24px 24px 26px; text-decoration: none; border-left: var(--rule-w) solid var(--rule); }
.reading:first-child { border-left: 0; padding-left: 0; }
.reading__tag { font-family: var(--f-mono); font-size: .64rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.reading__fig { margin-top: 14px; font-family: var(--f-fig); font-size: clamp(2.2rem, 3.5vw, 3.3rem); font-weight: var(--w-fig); line-height: .95; letter-spacing: -.035em; color: var(--fig-color); font-variant-numeric: tabular-nums lining-nums; }
.reading__fig.is-neg { color: var(--neg); }
.reading__lbl { font-family: var(--f-mono); font-size: .68rem; color: var(--faint); }
.reading__name { margin-top: 16px; font-family: var(--f-title); font-weight: var(--w-title); font-size: 1.1rem; }
.reading__v { font-family: var(--f-mono); font-size: .68rem; color: var(--muted); letter-spacing: .03em; }
.reading:hover .reading__name { color: var(--accent); }

/* ---------- evidence (track + scroll) ---------- */
.ev { display: grid; grid-template-columns: auto minmax(0, 1fr); grid-template-areas: "fig lbl" "name name" "v v"; column-gap: 12px; row-gap: 3px; align-items: baseline; text-decoration: none; padding-top: 14px; border-top: var(--rule-w) solid var(--rule); }
.ev__fig { grid-area: fig; font-family: var(--f-fig); font-size: 2rem; font-weight: var(--w-fig); line-height: 1; letter-spacing: -.03em; color: var(--fig-color); font-variant-numeric: tabular-nums lining-nums; }
.ev__fig.is-neg { color: var(--neg); }
.ev__lbl { grid-area: lbl; font-family: var(--f-mono); font-size: .66rem; color: var(--faint); line-height: 1.35; }
.ev__name { grid-area: name; margin-top: 8px; font-family: var(--f-title); font-weight: var(--w-title); font-size: 1.02rem; overflow-wrap: anywhere; hyphens: manual; }
.ev__v { grid-area: v; font-family: var(--f-mono); font-size: .66rem; color: var(--muted); }
.ev:hover .ev__name { color: var(--accent); }
.also-names { margin-top: 14px; font-family: var(--f-mono); font-size: .68rem; letter-spacing: .02em; }
.also-names a { color: var(--muted); text-decoration: none; border-bottom: var(--rule-w) solid var(--rule); }
.also-names a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ---------- TRACK layout ---------- */
.track { margin-top: var(--section-gap); }
.track__row { display: grid; grid-template-columns: minmax(0, 1fr) 54px minmax(0, 1fr) 54px minmax(0, 1fr); align-items: stretch; }
.panel {
  position: relative; display: flex; flex-direction: column; padding: 24px 24px 24px;
  background: var(--panel-bg, transparent); border: var(--rule-w) solid var(--rule);
  border-top: var(--rule-strong-w) solid var(--rule-strong); border-radius: var(--card-radius);
}
.panel__n { font-family: var(--f-mono); font-size: .72rem; font-weight: 700; letter-spacing: .1em; color: var(--accent); }
.panel__verb { margin-top: 6px; font-family: var(--f-display); font-weight: var(--w-verb); font-size: var(--panel-verb, clamp(2.1rem, 3.3vw, 3.2rem)); line-height: 1; letter-spacing: var(--track-verb); text-transform: var(--case-verb); }
.panel__verb a { text-decoration: none; }
.panel__verb a:hover { color: var(--accent); }
.panel__q { margin-top: 14px; font-family: var(--f-q); font-style: var(--style-q); font-size: 1rem; line-height: 1.45; color: var(--muted); }
.panel__ev { margin-top: auto; padding-top: 22px; display: grid; gap: 14px; }
.panel__works { list-style: none; padding: 0; margin: 24px 0 0; border-top: var(--rule-w) solid var(--rule); }
.panel__works li { border-bottom: var(--rule-w) solid var(--rule); }
.panel__works a {
  display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding: 10px 0;
  font-family: var(--f-title); font-weight: var(--w-title); font-size: 1.04rem; line-height: 1.3; text-decoration: none;
}
.panel__works a::after { content: "→"; font-family: var(--f-mono); font-size: .8em; color: var(--accent); opacity: 0; transform: translateX(-4px); transition: opacity .15s, transform .15s; }
.panel__works a:hover, .panel__works a:focus-visible { color: var(--accent); }
.panel__works a:hover::after, .panel__works a:focus-visible::after { opacity: 1; transform: none; }
/* forward links between panels, with a pulse that travels along them */
.track__link { position: relative; align-self: start; margin-top: 50px; height: 0; }
.track__link i { position: absolute; left: 6px; right: 10px; top: -1px; height: 2px; background: var(--ink); overflow: hidden; }
.track__link i::before { content: ""; position: absolute; inset: 0; width: 40%; background: linear-gradient(90deg, transparent, var(--loop-color), transparent); animation: pulse-x 2.4s linear infinite; }
.track__link::after { content: ""; position: absolute; right: 2px; top: -6px; border-left: 10px solid var(--ink); border-top: 6px solid transparent; border-bottom: 6px solid transparent; }
.track__row > .track__link:nth-of-type(2) i::before { animation-delay: 1.2s; }
@keyframes pulse-x { from { transform: translateX(-100%); } to { transform: translateX(260%); } }
/* the return: under the row, from Compose back to Measure */
.track__return { position: relative; padding-top: 60px; }
.track__rail {
  position: absolute; top: 0; height: 40px;
  left: calc((100% - 108px) / 6); right: calc((100% - 108px) / 6);
  border: calc(var(--loop-w) + .5px) solid var(--loop-color); border-top: 0; border-radius: 0 0 var(--loop-r) var(--loop-r);
}
.track__rail::before { content: ""; position: absolute; left: calc(var(--loop-w) * -1 - 6px); top: -11px; border-bottom: 12px solid var(--loop-color); border-left: 7px solid transparent; border-right: 7px solid transparent; }
.track__return p { text-align: center; font-size: .98rem; color: var(--muted); }
.track__return b { color: var(--loop-ink); }
.track__ground { display: flex; flex-wrap: wrap; justify-content: center; align-items: baseline; gap: 8px 10px; margin-top: 18px; font-family: var(--f-mono); font-size: .72rem; color: var(--faint); }
.track__ground span:not(.track__ground-k):not(.track__now) { color: var(--ink); background: var(--accent-soft); padding: 4px 8px; border-radius: var(--radius); }
.track__now { margin-left: 8px; color: var(--ink); font-weight: 600; }

/* ---------- SCROLL layout ---------- */
.hero--tall { min-height: calc(100svh - 64px); align-items: center; padding-top: 0; }
.hero__cue { margin-top: 44px; font-family: var(--f-mono); font-size: .72rem; letter-spacing: .16em; text-transform: uppercase; color: var(--faint); }
.scrolly { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); column-gap: clamp(32px, 6vw, 96px); margin-top: clamp(24px, 4vw, 48px); }
.scrolly__steps { grid-column: 1; grid-row: 1; }
.scrolly__fig { grid-column: 2; grid-row: 1; position: sticky; top: 10vh; height: 80vh; display: flex; align-items: center; justify-content: center; align-self: start; }
.scrolly__fig .ring__fig { max-width: min(420px, 72vh); }
.scrolly__steps { padding-block: 0 28vh; }
.step { min-height: 70vh; display: flex; flex-direction: column; justify-content: center; transition: opacity .4s; }
.step__n { font-family: var(--f-mono); font-size: .74rem; font-weight: 700; letter-spacing: .12em; color: var(--accent); }
.step__verb { margin-top: 6px; font-family: var(--f-display); font-weight: var(--w-verb); font-size: var(--step-verb, clamp(2.6rem, 5vw, 4.4rem)); line-height: 1; letter-spacing: var(--track-verb); text-transform: var(--case-verb); }
.step__verb a { text-decoration: none; }
.step__verb a:hover { color: var(--accent); }
.step__q { margin-top: 18px; font-family: var(--f-q); font-style: var(--style-q); font-size: 1.22rem; line-height: 1.42; max-width: 30ch; }
.step__d { margin-top: 12px; color: var(--muted); max-width: 46ch; font-size: .98rem; }
.step__ev { margin-top: 24px; display: grid; gap: 14px; max-width: 30rem; }
.step--return .step__verb, .step--now .step__verb { font-size: clamp(2rem, 3.6vw, 3.2rem); }
.step--return .step__n, .step--return .step__verb { color: var(--loop-ink); }
/* which part of the ring is lit, by step; without JS the whole ring stays lit */
.js .step { opacity: .3; }
.js .step.is-on { opacity: 1; }
.js .scrolly .ring__leg, .js .scrolly .ring__node { opacity: .22; }
.js .scrolly .ring__dot { opacity: 0; }
.scrolly[data-step="measure"] .ring__node--measure,
.scrolly[data-step="train"] .ring__node--train, .scrolly[data-step="train"] .ring__leg--measure,
.scrolly[data-step="coordinate"] .ring__node--coordinate, .scrolly[data-step="coordinate"] .ring__leg--train,
.scrolly[data-step="return"] .ring__leg--ret, .scrolly[data-step="return"] .ring__node--coordinate, .scrolly[data-step="return"] .ring__node--measure,
.scrolly[data-step="now"] .ring__leg, .scrolly[data-step="now"] .ring__node, .scrolly[data-step="now"] .ring__dot { opacity: 1 !important; }
.scrolly[data-step="measure"] .ring__node--measure circle,
.scrolly[data-step="train"] .ring__node--train circle,
.scrolly[data-step="coordinate"] .ring__node--coordinate circle { fill: var(--accent); stroke: var(--accent); }
.scrolly[data-step="measure"] .ring__node--measure text,
.scrolly[data-step="train"] .ring__node--train text,
.scrolly[data-step="coordinate"] .ring__node--coordinate text { fill: var(--on-accent); }
.scrolly[data-step="now"] .ring__v--now { color: var(--accent); }

/* ---------- palette accents for the new pieces ---------- */
html[data-theme="night"] { --node-bg: #10141C; --panel-bg: linear-gradient(180deg, #121722 0%, #0E121A 100%); }
html[data-theme="night"] .ring__dot { filter: drop-shadow(0 0 6px rgba(242, 181, 68, .9)); }
html[data-theme="night"] .ring__leg--fwd, html[data-theme="night"] .ring__node circle { stroke: #9AA3B2; }
html[data-theme="night"] .ring__ah { fill: #9AA3B2; }
html[data-theme="night"] .reading__fig, html[data-theme="night"] .ev__fig, html[data-theme="night"] .tl__fig b { text-shadow: 0 0 20px rgba(242, 181, 68, .28); }
html[data-theme="night"] .panel { border-color: #1F2531; border-top-color: #343B49; }
html[data-theme="night"] .track__link i { background: #6B7383; }
html[data-theme="night"] .track__link::after { border-left-color: #6B7383; }
html[data-theme="swiss"] { --ring-w: 2.5px; --tl-verb: clamp(2rem, 3.2vw, 2.9rem); --panel-verb: clamp(1.9rem, 3vw, 2.9rem); --step-verb: clamp(2.6rem, 5.4vw, 4.8rem); }
html[data-theme="swiss"] .reading__tag, html[data-theme="swiss"] .tl__n, html[data-theme="swiss"] .panel__n, html[data-theme="swiss"] .step__n { color: var(--accent); }
html[data-theme="swiss"] .reading__fig { letter-spacing: -.06em; font-size: clamp(2.6rem, 4.4vw, 4.2rem); }
html[data-theme="swiss"] .panel { border-width: 0; border-top-width: 4px; padding-inline: 0; }

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .ring__stage { display: grid; grid-template-columns: minmax(0, 1fr); justify-items: center; }
  .ring__orbit { display: contents; }
  .ring__stage > .tl, .ring__orbit > .tl { position: static; width: auto; max-width: 30rem; text-align: left; justify-self: stretch; margin: 0; padding: 22px 0; border-top: var(--rule-w) solid var(--rule); }
  .ring__stage .ring__fig { order: 0; margin-bottom: 18px; max-width: 360px; }
  .ring__orbit { margin-bottom: 0; }
  .tl--measure { order: 1; } .tl--train { order: 2; } .tl--coordinate { order: 3; }
  .tl--measure .tl__q { margin-inline: 0; }
  .ring__return { text-align: left; margin-left: 0; }
}
@media (max-width: 900px) {
  .readings__row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .reading:nth-child(3) { border-left: 0; padding-left: 0; }
  .reading:nth-child(n+3) { border-top: var(--rule-w) solid var(--rule); }

  .track__row { grid-template-columns: minmax(0, 1fr); padding-left: 30px; position: relative; }
  .track__link { margin: 0; height: 34px; }
  .track__link i { left: 50%; right: auto; top: 4px; bottom: 12px; width: 2px; height: auto; }
  .track__link i::before { width: 100%; height: 40%; background: linear-gradient(180deg, transparent, var(--loop-color), transparent); animation-name: pulse-y; }
  .track__link::after { right: auto; left: calc(50% - 5px); top: auto; bottom: 2px; border-left: 6px solid transparent; border-right: 6px solid transparent; border-top: 10px solid var(--ink); border-bottom: 0; }
  html[data-theme="night"] .track__link::after { border-top-color: #6B7383; border-left-color: transparent; }
  .track__rail { display: none; }
  /* the return becomes a rail down the left edge, drawn in segments so it survives any panel height */
  .track__row > *::before { content: ""; position: absolute; left: -24px; border: 0 solid var(--loop-color); border-left-width: calc(var(--loop-w) + .5px); }
  .track__row > .panel:first-child::before { top: 44px; bottom: calc(var(--rule-w) * -1); border-top-width: calc(var(--loop-w) + .5px); border-top-left-radius: var(--loop-r); width: 18px; }
  .track__row > .track__link::before { top: 0; bottom: 0; }
  .track__row > .panel--train::before { top: -1px; bottom: -1px; }
  .track__row > .panel:last-child::before { top: -1px; height: 45px; border-bottom-width: calc(var(--loop-w) + .5px); border-bottom-left-radius: var(--loop-r); width: 18px; }
  .track__row > .panel:first-child::after { content: ""; position: absolute; left: -9px; top: calc(44px - 6px + var(--loop-w) / 2); border-left: 9px solid var(--loop-color); border-top: 6px solid transparent; border-bottom: 6px solid transparent; }
  .track__return { padding-top: 20px; }
  .track__return p, .track__ground { text-align: left; justify-content: flex-start; }

  .hero--tall { min-height: 0; padding-top: clamp(48px, 8vw, 96px); }
  .scrolly { grid-template-columns: minmax(0, 1fr); }
  .scrolly__fig { grid-column: 1; grid-row: 1; }
  .scrolly__steps { grid-column: 1; grid-row: 2; }
  .scrolly__fig { position: sticky; top: 0; z-index: 3; height: auto; padding: 12px 0; background: var(--bg); border-bottom: var(--rule-w) solid var(--rule); }
  .scrolly__fig .ring__fig { max-width: 190px; }
  .scrolly .ring__center, .scrolly .ring__arclabel { display: none; }
  .scrolly__steps { padding-block: 8vh 30vh; }
  .step { min-height: 62vh; }
}
@keyframes pulse-y { from { transform: translateY(-100%); } to { transform: translateY(260%); } }
@media (max-width: 720px) {
  .readings__row { grid-template-columns: minmax(0, 1fr); }
  .reading { border-left: 0 !important; padding-left: 0 !important; padding-right: 0; border-top: var(--rule-w) solid var(--rule); }
  .reading:first-child { border-top: 0; }
  .ring .ring__arclabel { display: none; }
  .ring__v { font-size: .84rem; }
}
@media (prefers-reduced-motion: reduce) {
  .ring__dot { display: none; }
  .track__link i::before { animation: none; display: none; }
  .ring__leg, .ring__node, .ring__node circle, .step { transition: none; }
}