/* Making Physics — homage to makingsoftware.com
   Warm paper, ink, electric blue. Mono labels, serif display + body
   (Newsreader carries headings and prose; Space Mono carries all chrome). */

:root{
  --paper:      #f3efe6;
  --paper-2:    #ece6da;
  --card:       #fbf9f4;
  --ink:        #16171d;
  --ink-soft:   #3a3b44;
  --muted:      #7c766a;
  --line:       #d9d2c4;
  --line-2:     #cabfa9;
  --accent:     #2f49e0;   /* electric blue */
  --accent-ink: #1c2fa6;
  --accent2:    #f0ad3f;   /* warm gold */
  --maxw:       1120px;
  --readw:      720px;
  --radius:     14px;
  --mono: 'Space Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: 'Space Grotesk', system-ui, -apple-system, Segoe UI, sans-serif;
  --serif: 'Newsreader', Georgia, 'Times New Roman', serif;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--serif);
  font-size:18px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(22,23,29,0.045) 1px, transparent 0);
  background-size:22px 22px;
}
::selection{ background:rgba(47,73,224,0.18); }
a{ color:var(--accent); text-decoration:none; }
a:hover{ text-decoration:underline; text-underline-offset:3px; }
img{ max-width:100%; display:block; }
code{
  font-family:var(--mono);
  font-size:0.82em;
  background:rgba(22,23,29,0.06);
  border:1px solid var(--line);
  border-radius:6px;
  padding:1px 5px;
}

/* ── nav ─────────────────────────────────────────── */
.nav{
  position:sticky; top:0; z-index:20;
  display:flex; align-items:center; justify-content:space-between;
  gap:18px; flex-wrap:wrap;
  padding:14px clamp(18px,4vw,40px);
  background:rgba(243,239,230,0.82);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.brand{
  display:flex; align-items:center; gap:10px;
  color:var(--ink); font-family:var(--mono); font-weight:700;
  font-size:15px; letter-spacing:0.02em;
}
.brand:hover{ text-decoration:none; }
.mark{ width:28px; height:28px; flex:none; }
.nav-links{
  display:flex; align-items:center; gap:clamp(12px,2.4vw,26px);
  font-family:var(--mono); font-size:12.5px; letter-spacing:0.04em;
}
.nav-links a{ color:var(--ink-soft); text-transform:lowercase; }
.nav-links a:hover{ color:var(--accent); text-decoration:none; }
.nav-links a.is-active{ color:var(--accent); }

main{ max-width:var(--maxw); margin:0 auto; padding:0 clamp(18px,4vw,40px) 40px; }

/* ── hero ────────────────────────────────────────── */
.hero{ padding:clamp(48px,9vw,104px) 0 clamp(36px,6vw,64px); max-width:880px; }
.eyebrow{
  font-family:var(--mono); text-transform:uppercase;
  letter-spacing:0.26em; font-size:12px; color:var(--accent-ink);
  margin:0 0 18px;
}
.hero-title{
  font-family:var(--serif); font-weight:500;
  font-size:clamp(40px,8vw,82px); line-height:1.02;
  letter-spacing:-0.012em; margin:0 0 22px; color:var(--ink);
}
.hero-lead{
  font-size:clamp(18px,2.4vw,22px); line-height:1.6;
  color:var(--ink-soft); margin:0 0 26px; max-width:660px;
}
.hero-lead em{ font-style:italic; color:var(--ink); }
.hero-meta{
  font-family:var(--mono); font-size:13px; color:var(--muted);
  display:flex; flex-wrap:wrap; align-items:center; gap:12px;
}
.hero-meta strong{ color:var(--ink); }
.sep{ opacity:0.5; }

/* ── chapter groups ──────────────────────────────── */
.chapter-group{ margin:clamp(30px,4.5vw,52px) 0 0; scroll-margin-top:120px; }
.group-head{ border-top:2px solid var(--ink); padding-top:16px; margin-bottom:18px; max-width:820px; }
.group-title{ margin:0; }
.group-kicker{
  font-family:var(--mono); font-size:13px; letter-spacing:0.22em;
  text-transform:uppercase; color:var(--accent-ink); font-weight:700;
}
.group-title{
  font-family:var(--serif); font-weight:500; font-size:clamp(26px,4vw,38px);
  letter-spacing:-0.006em; line-height:1.12;
}
.group-blurb{ color:var(--ink-soft); font-size:17px; margin:10px 0 0; }

.card-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(290px, 1fr));
  gap:clamp(16px,2vw,24px);
}
.card{
  display:flex; flex-direction:column;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
  color:var(--ink);
  transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover{
  text-decoration:none;
  transform:translateY(-4px);
  border-color:var(--line-2);
  box-shadow:0 14px 32px -18px rgba(22,23,29,0.5);
}
.card-fig{
  aspect-ratio:16/10; background:#fff;
  border-bottom:1px solid var(--line);
  display:grid; place-items:center; overflow:hidden;
}
.card-fig img{ width:100%; height:100%; object-fit:contain; padding:10px; }
.card-body{ padding:16px 18px 20px; }
.card-num{
  font-family:var(--mono); font-size:12px; font-weight:700;
  color:var(--accent); letter-spacing:0.08em;
}
.card-title{
  font-family:var(--serif); font-weight:500; font-size:22px;
  letter-spacing:0; margin:4px 0 8px; line-height:1.18;
}
.card-desc{ color:var(--ink-soft); font-size:15px; line-height:1.5; margin:0; }

/* ── compact chapter rows (concise, grouped by track) ── */
.group-title{ display:flex; align-items:baseline; flex-wrap:wrap; gap:14px; }
.group-part{
  font-family:var(--mono); font-size:12px; letter-spacing:0.18em;
  text-transform:uppercase; color:var(--accent2); font-weight:700;
}
.group-count{
  font-family:var(--mono); font-size:11.5px; letter-spacing:0.06em;
  text-transform:uppercase; color:var(--muted); font-weight:400;
  margin-left:auto;
}
.ch-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(340px, 1fr));
  gap:10px;
}
.ch{
  display:flex; align-items:center; gap:14px;
  padding:10px 12px;
  border:1px solid var(--line); border-radius:12px;
  background:var(--card); color:var(--ink);
  transition:border-color .16s ease, transform .16s ease, box-shadow .16s ease;
}
.ch:hover{
  text-decoration:none; border-color:var(--line-2);
  transform:translateY(-2px);
  box-shadow:0 12px 26px -20px rgba(22,23,29,0.55);
}
.ch-thumb{
  flex:none; width:74px; height:56px; border-radius:8px;
  background:#fff; border:1px solid var(--line);
  display:grid; place-items:center; overflow:hidden;
}
.ch-thumb img{ width:100%; height:100%; object-fit:contain; padding:5px; }
.ch-text{ min-width:0; display:flex; flex-direction:column; gap:1px; }
.ch-num{
  font-family:var(--mono); font-size:11px; font-weight:700;
  letter-spacing:0.08em; color:var(--accent);
}
.ch-title{
  font-family:var(--serif); font-weight:600; font-size:18px;
  letter-spacing:0; line-height:1.2; color:var(--ink);
}
.ch:hover .ch-title{ color:var(--accent-ink); }
.ch-desc{
  font-size:13px; line-height:1.4; color:var(--muted);
  margin-top:2px;
  display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden;
}

/* ── about ───────────────────────────────────────── */
.about{ margin:clamp(48px,8vw,84px) 0 0; scroll-margin-top:80px; }
.about .group-title{ border-top:2px solid var(--ink); padding-top:18px; }
.about-grid{ max-width:var(--readw); margin-top:18px; }
.about-grid p{ color:var(--ink-soft); }

/* ── chapter layout: sidebar rail + reading column ─ */
.layout{
  display:flex; align-items:flex-start;
  max-width:1320px; margin:0 auto;
  gap:clamp(22px,3.6vw,60px);
  padding:0 clamp(16px,3vw,36px);
}
.toc{
  position:sticky; top:57px; flex:none; width:288px;
  align-self:flex-start; height:calc(100vh - 57px);
  overflow-y:auto; overscroll-behavior:contain;
  border-right:1px solid var(--line);
  padding:30px 24px 40px 2px;
  scrollbar-width:thin; scrollbar-color:var(--line-2) transparent;
}
.toc::-webkit-scrollbar{ width:8px; }
.toc::-webkit-scrollbar-thumb{ background:var(--line-2); border-radius:999px; }
.toc-inner{ display:flex; flex-direction:column; gap:24px; min-height:100%; }
.toc-nav{ display:flex; flex-direction:column; gap:22px; }
.toc-part{ display:flex; flex-direction:column; gap:2px; }
.toc-head{ display:flex; align-items:baseline; gap:8px; margin-bottom:7px; }
.toc-part-n{
  font-family:var(--mono); font-size:10.5px; font-weight:700;
  letter-spacing:0.12em; text-transform:uppercase; color:var(--accent2);
}
.toc-part-l{
  font-family:var(--mono); font-size:10.5px; letter-spacing:0.14em;
  text-transform:uppercase; color:var(--muted); font-weight:700;
}
.toc-part.is-active .toc-part-l{ color:var(--ink-soft); }
.toc-link{
  display:flex; gap:9px; align-items:baseline;
  padding:4px 9px; border-radius:7px; color:var(--ink-soft); line-height:1.32;
}
.toc-link:hover{ background:var(--paper-2); color:var(--ink); text-decoration:none; }
.toc-num{
  font-family:var(--mono); font-size:11px; font-weight:700; color:var(--muted);
  flex:none; width:18px; font-variant-numeric:tabular-nums;
}
.toc-name{ font-family:var(--serif); font-weight:500; font-size:15px; letter-spacing:0; }
.toc-link.is-current{ background:rgba(47,73,224,0.08); color:var(--accent); }
.toc-link.is-current .toc-num{ color:var(--accent); }
.toc-link.is-current .toc-name{ font-weight:600; }
.toc-subs{ display:flex; flex-direction:column; margin:3px 0 5px 36px; }
.toc-sub{
  font-family:var(--serif); font-size:13.5px; color:var(--muted);
  padding:3px 0 3px 12px; border-left:2px solid var(--line); line-height:1.35;
}
.toc-sub:hover{ color:var(--accent); border-color:var(--accent); text-decoration:none; }
.toc-sub.active{ color:var(--ink); border-color:var(--accent2); }
.toc-foot{
  margin-top:auto; padding-top:18px; border-top:1px solid var(--line);
  display:flex; flex-direction:column; gap:9px;
}
.toc-cta{ font-family:var(--mono); font-size:12px; color:var(--accent); }
.toc-cta.ghost{ color:var(--muted); }
.toc-cta.ghost:hover{ color:var(--accent); }
.toc-toggle{ display:none; }

/* ── article ─────────────────────────────────────── */
.layout .article{
  flex:1 1 auto; min-width:0; max-width:780px; margin:0 auto;
  padding:0 0 30px;
}
.crumbs{
  display:flex; flex-wrap:wrap; align-items:center; gap:7px;
  font-family:var(--mono); font-size:12.5px; letter-spacing:0.03em;
  color:var(--muted); padding-top:34px;
}
.crumbs a{ color:var(--muted); }
.crumbs a:hover{ color:var(--accent); }
.crumb-here{ color:var(--ink-soft); }
.article-head{ margin:18px 0 30px; }
.article-num{
  font-family:var(--mono); font-size:13px; font-weight:700;
  letter-spacing:0.14em; text-transform:uppercase; color:var(--accent-ink);
}
.article-title{
  font-family:var(--serif); font-weight:500; font-size:clamp(34px,6vw,56px);
  letter-spacing:-0.012em; line-height:1.06; margin:10px 0 16px;
}
.article-lead{
  font-size:clamp(19px,2.6vw,23px); line-height:1.5; color:var(--ink-soft);
  font-style:italic; margin:0;
}

.prose{ margin:30px 0; scroll-margin-top:78px; }
.prose h2{
  font-family:var(--serif); font-weight:600; font-size:clamp(23px,3vw,29px);
  letter-spacing:-0.005em; line-height:1.22; margin:0 0 12px;
}
.prose p{ margin:0 0 1.1rem; color:var(--ink-soft); }
.prose p:last-child{ margin-bottom:0; }

/* figures */
.fig, .hero-fig{ margin:30px 0; }
.hero-fig{ margin:6px 0 34px; }
.fig-frame{
  background:#fff; border:1px solid var(--line); border-radius:var(--radius);
  padding:clamp(12px,2vw,22px); display:grid; place-items:center;
  box-shadow:0 10px 28px -22px rgba(22,23,29,0.5);
}
.fig-frame img{ width:100%; height:auto; }
figcaption{
  font-family:var(--mono); font-size:12.5px; line-height:1.5;
  color:var(--muted); margin-top:12px; padding-left:14px;
  border-left:2px solid var(--accent2);
}
.fig-n{
  font-family:var(--mono); font-style:italic; font-weight:700;
  color:var(--accent-ink); margin-right:4px;
}

/* cta */
.cta{
  margin:44px 0 8px; padding:26px clamp(20px,3vw,30px);
  background:var(--paper-2); border:1px solid var(--line);
  border-radius:var(--radius);
}
.cta p{ margin:0 0 16px; color:var(--ink-soft); font-size:16px; }
.cta-btn{
  display:inline-block; font-family:var(--mono); font-size:13px; font-weight:700;
  letter-spacing:0.04em; background:var(--ink); color:var(--paper);
  padding:12px 18px; border-radius:9px;
}
.cta-btn:hover{ background:var(--accent); text-decoration:none; }

/* pager */
.pager{
  display:grid; grid-template-columns:1fr 1fr; gap:14px;
  margin:38px 0 10px; padding-top:24px; border-top:1px solid var(--line);
}
.pager a{
  display:flex; flex-direction:column; gap:3px; padding:14px 16px;
  border:1px solid var(--line); border-radius:var(--radius);
  background:var(--card); color:var(--ink);
}
.pager a:hover{ border-color:var(--line-2); text-decoration:none; }
.pager-next{ text-align:right; }
.pager span{ font-family:var(--mono); font-size:11.5px; letter-spacing:0.06em; color:var(--muted); text-transform:uppercase; }
.pager strong{ font-family:var(--serif); font-weight:500; font-size:18px; }

/* ── footer ──────────────────────────────────────── */
.foot{
  max-width:var(--maxw); margin:60px auto 0; padding:28px clamp(18px,4vw,40px) 50px;
  border-top:1px solid var(--line);
}
.foot-top{
  font-family:var(--mono); font-size:13px; color:var(--ink-soft);
  display:flex; flex-wrap:wrap; gap:10px; align-items:baseline;
}
.foot-top span:first-child{ font-weight:700; color:var(--ink); }
.foot-bot{ margin-top:10px; font-size:15px; color:var(--muted); }

/* ── sticky track pills (index) ──────────────────── */
.pills{
  position:sticky; top:57px; z-index:15;
  background:rgba(243,239,230,0.9); backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.pills-inner{
  max-width:var(--maxw); margin:0 auto;
  padding:9px clamp(18px,4vw,40px);
  display:flex; gap:8px; overflow-x:auto; scrollbar-width:none;
}
.pills-inner::-webkit-scrollbar{ display:none; }
.pills a{
  flex:none; font-family:var(--mono); font-size:11.5px; letter-spacing:0.06em;
  text-transform:uppercase; color:var(--ink-soft);
  padding:5px 11px; border:1px solid var(--line); border-radius:999px;
  background:var(--card); transition:all .16s ease;
}
.pills a:hover{ color:var(--accent); border-color:var(--line-2); text-decoration:none; }
.pills a.on{ color:#fff; background:var(--accent); border-color:var(--accent); }

/* ── interactive simulations ─────────────────────── */
.sim-wrap{ margin:6px 0 34px; }
.sim-tag{
  font-family:var(--mono); font-size:11px; letter-spacing:0.18em;
  text-transform:uppercase; color:var(--accent-ink); font-weight:700;
  display:inline-block; margin-bottom:8px;
}
.sim{
  border:1px solid var(--line); border-radius:var(--radius); overflow:hidden;
  background:var(--card);
  box-shadow:0 14px 34px -24px rgba(22,23,29,0.55);
}
.sim-stage{ background:#fff; border-bottom:1px solid var(--line); }
.sim-canvas{ display:block; width:100%; touch-action:none; }
.sim-panel{
  display:flex; flex-wrap:wrap; align-items:flex-end; gap:14px 22px;
  padding:16px clamp(14px,2.2vw,22px);
}
.sim-ctrl{ display:flex; flex-direction:column; gap:6px; min-width:150px; flex:1 1 150px; max-width:230px; }
.sim-lab{
  font-family:var(--mono); font-size:11px; letter-spacing:0.08em;
  text-transform:uppercase; color:var(--muted);
  display:flex; justify-content:space-between; gap:8px;
}
.sim-val{ color:var(--ink); font-weight:700; }
.sim-ctrl input[type=range]{
  -webkit-appearance:none; appearance:none; width:100%; height:4px;
  background:var(--line-2); border-radius:999px; outline:none; cursor:pointer;
}
.sim-ctrl input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none; appearance:none; width:16px; height:16px; border-radius:50%;
  background:var(--accent); border:2px solid #fff; box-shadow:0 1px 4px rgba(0,0,0,.25); cursor:grab;
}
.sim-ctrl input[type=range]::-moz-range-thumb{
  width:15px; height:15px; border-radius:50%; background:var(--accent);
  border:2px solid #fff; cursor:grab;
}
.sim-btn{
  font-family:var(--mono); font-size:12px; letter-spacing:0.04em;
  padding:9px 14px; border-radius:9px; cursor:pointer;
  border:1px solid var(--line-2); background:var(--paper-2); color:var(--ink);
  transition:all .14s ease;
}
.sim-btn:hover{ border-color:var(--accent); color:var(--accent); }
.sim-btn.primary{ background:var(--ink); color:var(--paper); border-color:var(--ink); }
.sim-btn.primary:hover{ background:var(--accent); border-color:var(--accent); color:#fff; }
.sim-seg{ display:flex; border:1px solid var(--line-2); border-radius:9px; overflow:hidden; }
.sim-seg-b{
  font-family:var(--mono); font-size:12px; padding:8px 13px; cursor:pointer;
  border:0; background:var(--paper-2); color:var(--ink-soft); border-right:1px solid var(--line-2);
}
.sim-seg-b:last-child{ border-right:0; }
.sim-seg-b.on{ background:var(--accent); color:#fff; }
.sim-read{ display:flex; flex-direction:column; gap:2px; min-width:78px; }
.sim-read-k{
  font-family:var(--mono); font-size:10.5px; letter-spacing:0.1em;
  text-transform:uppercase; color:var(--muted);
}
.sim-read-v{ font-family:var(--mono); font-size:16px; font-weight:700; color:var(--ink); font-variant-numeric:tabular-nums; }
.sim-cap{
  font-family:var(--mono); font-size:12.5px; line-height:1.55; color:var(--muted);
  margin:12px 0 0; padding-left:14px; border-left:2px solid var(--accent);
}
.sim-note{
  font-family:var(--mono); font-size:11px; letter-spacing:0.04em;
  color:var(--muted); align-self:center;
}

/* ── reading progress ────────────────────────────── */
.progress{
  position:fixed; top:0; left:0; right:0; height:3px; z-index:30;
  background:linear-gradient(90deg, var(--accent), var(--accent2));
  transform:scaleX(0); transform-origin:0 50%;
}

/* ── key equations panel (compact: formula + note per row) ───────── */
.eqs{
  margin:6px 0 26px; padding:15px clamp(16px,2.4vw,22px);
  background:var(--paper-2); border:1px solid var(--line);
  border-left:3px solid var(--accent); border-radius:var(--radius);
}
.eqs-head{ margin:0 0 2px; }
.eqs-kicker{
  font-family:var(--mono); font-size:11.5px; letter-spacing:0.2em;
  text-transform:uppercase; color:var(--accent-ink); font-weight:700;
}
.eq-list{ list-style:none; margin:4px 0 0; padding:0; }
.eq-list li{
  display:grid; grid-template-columns:minmax(0,auto) 1fr;
  align-items:center; gap:6px 22px;
  padding:7px 0; border-bottom:1px dashed var(--line-2);
}
.eq-list li:last-child{ border-bottom:0; }
.eq-tex{ overflow-x:auto; overflow-y:hidden; }
.eq-tex .katex{ font-size:1.02em; color:var(--ink); }
/* render as inline-sized math, not a centred display block with 1em margins */
.eq-tex .katex-display{ margin:0; text-align:left; }
.eq-tex .katex-display > .katex{ text-align:left; white-space:normal; }
.eq-tex:not([data-done]){ font-family:var(--mono); font-size:13px; color:var(--ink-soft); }
.eq-note{
  font-family:var(--mono); font-size:11.5px; line-height:1.4;
  color:var(--muted); padding-left:12px; border-left:2px solid var(--accent2);
}
@media (max-width:560px){
  .eq-list li{ grid-template-columns:1fr; gap:5px; }
}

/* ── inline math (KaTeX) in prose, captions, lists ───────────────── */
.m .katex{ font-size:1em; color:var(--ink); }
figcaption .m .katex{ color:var(--ink); }
/* graceful fallback if KaTeX hasn't rendered: show raw TeX like code */
.m:not([data-done]){
  font-family:var(--mono); font-size:0.84em;
  background:rgba(22,23,29,0.06); border:1px solid var(--line);
  border-radius:6px; padding:1px 5px;
}

/* ── reveal animation ────────────────────────────── */
.reveal, .card{
  opacity:0; transform:translateY(16px);
  transition:opacity .6s ease, transform .6s cubic-bezier(.2,.7,.2,1);
  transition-delay:var(--d, 0ms);
}
.reveal.in, .card.in{ opacity:1; transform:none; }

/* ── lightbox ────────────────────────────────────── */
.zoomable{ cursor:zoom-in; }
.lightbox{
  position:fixed; inset:0; z-index:50;
  background:rgba(18,19,24,0.86); backdrop-filter:blur(6px);
  display:none; place-items:center; padding:4vmin; cursor:zoom-out;
}
.lightbox.open{ display:grid; }
.lightbox img{
  max-width:94vw; max-height:92vh; width:auto; height:auto;
  background:#fff; border-radius:10px; padding:14px;
  box-shadow:0 30px 80px -20px rgba(0,0,0,0.7);
}

/* ── back to top ─────────────────────────────────── */
.totop{
  position:fixed; right:18px; bottom:18px; z-index:25;
  width:44px; height:44px; border-radius:999px;
  border:1px solid var(--line-2); background:var(--card); color:var(--ink);
  font-size:18px; cursor:pointer; display:grid; place-items:center;
  opacity:0; pointer-events:none; transform:translateY(8px);
  transition:opacity .2s ease, transform .2s ease, background .16s ease;
  box-shadow:0 10px 26px -16px rgba(22,23,29,0.6);
}
.totop.show{ opacity:1; pointer-events:auto; transform:none; }
.totop:hover{ background:var(--accent); color:#fff; border-color:var(--accent); }

/* sidebar collapses into a drawer below the nav on narrow screens */
@media (max-width:960px){
  .layout{ flex-direction:column; gap:0; }
  .toc-toggle{
    order:-1; display:inline-flex; align-items:center; gap:8px;
    align-self:flex-start; margin:18px 0 0;
    font-family:var(--mono); font-size:11.5px; letter-spacing:0.08em;
    text-transform:uppercase; color:var(--ink-soft);
    background:var(--card); border:1px solid var(--line); border-radius:9px;
    padding:8px 14px; cursor:pointer;
  }
  .toc-toggle::after{ content:"▾"; font-size:11px; transition:transform .2s ease; }
  .toc-toggle[aria-expanded="true"]::after{ transform:rotate(180deg); }
  .toc{
    position:static; width:auto; height:auto; max-height:0;
    overflow:hidden; border-right:0; padding:0;
    border-bottom:1px solid transparent;
  }
  .toc.open{
    max-height:none; overflow:visible; margin-top:14px;
    padding:6px 2px 22px; border-bottom:1px solid var(--line);
  }
  .toc-inner{ min-height:0; }
  .toc-foot{ display:none; }
  .layout .article{ max-width:none; padding-top:10px; }
}
@media (max-width:560px){
  body{ font-size:17px; }
  .pager{ grid-template-columns:1fr; }
  .pager-next{ text-align:left; }
  .pills{ top:53px; }
}
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  .card, .reveal{ transition:none; opacity:1; transform:none; }
  .progress{ transition:none; }
}