/* khanhtrang-site. Tokens and rules: DESIGN.md. Fonts: css/fonts.css (generated by build.mjs). */
:root {
  --paper: #F5F6F2; --surface: #FFFFFF; --ink: #17212B; --muted: #56626B; --rule: #D5D9D2;
  --gen: #1D5A87; --omx: #B8401A; --amber: #E3A21A;
  /* arc B: a bright, healing stage (arc A's dark stage is kept in git tag arc-a-dark) */
  --stage: #EEF5F5; --stage-text: #17212B; --stage-muted: #4F5E66;
  --gen-d: #1D5A87; --omx-d: #B8401A;           /* lane colours on the stage (AA on #EEF5F5) */
  --thread-gen: #2F7BC0; --thread-omx: #E8702A; /* the two threads in every scene */
  --serif: "Source Serif 4 Variable", Georgia, serif;
  --ui: "Atkinson Hyperlegible Next Variable", "Segoe UI", Arial, sans-serif;
  --mono: "Martian Mono Variable", ui-monospace, Menlo, monospace;
  --s1: 8px; --s2: 16px; --s3: 24px; --s4: 32px; --s6: 48px; --s9: 72px;
  --rail-x: 32px; --content-x: 196px;
}
*, *::before, *::after { box-sizing: border-box; }
html { background: var(--stage); color: var(--ink); -webkit-text-size-adjust: 100%; }
body { margin: 0; font: 400 18px/1.6 var(--serif); }
img { display: block; max-width: 100%; }
a { color: inherit; text-underline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 12px; top: -48px; z-index: 50; background: var(--paper); color: var(--ink); padding: 8px 12px; font: 600 15px var(--ui); }
.skip:focus { top: 12px; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }
.r-n { font-family: var(--mono); font-stretch: 75%; letter-spacing: .04em; }

/* ---------------------------------------------------------------- masthead */
.mast { position: fixed; inset: 0 0 auto 0; z-index: 30; display: flex; justify-content: space-between; align-items: center;
  padding: 18px var(--rail-x); color: var(--stage-text); font: 400 15px var(--ui); pointer-events: none; }
.mast > * { pointer-events: auto; }
.mast-name { font: 600 13px var(--mono); font-stretch: 75%; letter-spacing: .12em; text-decoration: none; }
.mast nav a { margin-left: var(--s3); text-decoration: none; opacity: .88; }
.mast nav a:hover { opacity: 1; text-decoration: underline; }
body.past-zoom .mast { color: var(--ink); background: color-mix(in srgb, var(--paper) 92%, transparent); }

/* ---------------------------------------------------------------- the zoom */
.zoom { background: var(--stage); color: var(--stage-text); }
.zoom-track { height: 100svh; }                                   /* baseline without JS: one static scene */
.zoom.is-ready .zoom-track { height: calc((var(--levels) - 0.6) * 85svh + 100svh); }
.zoom-view { position: relative; height: 100svh; overflow: hidden; }
.zoom.is-ready .zoom-view { position: sticky; top: 0; }
.zoom:not(.is-ready) .z-controls, .zoom:not(.is-ready) .strands, .zoom:not(.is-ready) .z-cards { display: none; }
.zoom-layers { position: absolute; inset: 0; }
.z-layer { position: absolute; inset: 0; margin: 0; visibility: hidden; will-change: transform, opacity; }
.z-layer:first-child { visibility: visible; }
.z-layer img { width: 100%; height: 100%; object-fit: cover; }
@media (prefers-reduced-motion: no-preference) {
  .zoom.is-filming .z-layer.is-settled img { animation: drift 24s ease-in-out infinite alternate; }
  @keyframes drift { from { transform: scale(1); } to { transform: scale(1.045); } }
}
/* legibility: a flat directional shade under the text, not a glow */
.z-vignette { position: absolute; inset: 0; pointer-events: none; z-index: 3;
  background: linear-gradient(90deg, rgba(238,245,245,.94) 0, rgba(238,245,245,.72) 30%, rgba(238,245,245,0) 56%),
              linear-gradient(0deg, rgba(238,245,245,.9) 0, rgba(238,245,245,0) 30%); }

.z-title { position: absolute; left: var(--content-x); top: 20svh; max-width: 30rem; z-index: 5; }
.z-title h1 { margin: 0; font: 500 clamp(38px, 4.6vw, 68px)/1.04 var(--serif); font-variation-settings: "opsz" 60; letter-spacing: -.015em; }
.z-title p { margin: var(--s3) 0 0; font: 400 18px/1.5 var(--ui); color: var(--stage-text); max-width: 26rem; }

/* two strands: genetics (◆) and multiomics (●), lit by the lanes each scale uses */
.strands { position: absolute; left: var(--rail-x); top: 50%; transform: translateY(-50%); z-index: 6; font-family: var(--ui); }
.s-legend { margin: 0 0 12px; display: flex; flex-direction: column; gap: 2px; font: 600 11px var(--mono); font-stretch: 75%; letter-spacing: .06em; }
.s-legend .s-g { color: var(--gen-d); } .s-legend .s-o { color: var(--omx-d); }
.strands ol { list-style: none; margin: 0; padding: 0; position: relative; }
.strands ol::before, .strands ol::after { content: ""; position: absolute; top: 14px; bottom: 14px; width: 2px; opacity: .55; }
.strands ol::before { left: 5px; background: var(--gen-d); }
.strands ol::after { left: 19px; background: var(--omx-d); }
.strands li button { all: unset; cursor: pointer; display: grid; grid-template-columns: 12px 12px auto; column-gap: 2px; align-items: center; height: 36px; padding-right: 10px; color: var(--stage-muted); font-size: 14px; }
.strands li button::before, .strands li button::after { content: ""; width: 10px; height: 10px; justify-self: center; position: relative; z-index: 1; background: var(--stage); }
.strands li button::before { transform: rotate(45deg) scale(.75); border: 1.5px solid var(--gen-d); grid-column: 1; }
.strands li button::after { border-radius: 50%; border: 1.5px solid var(--omx-d); grid-column: 2; }
.strands li[data-g="1"].is-active button::before, .strands li[data-g="1"].is-past button::before { background: var(--gen-d); }
.strands li[data-o="1"].is-active button::after, .strands li[data-o="1"].is-past button::after { background: var(--omx-d); }
.strands li .r-n { grid-column: 3; grid-row: 1; margin-left: 12px; font-size: 11px; }
.strands li .r-nm { grid-column: 3; grid-row: 1; margin-left: 42px; opacity: 0; transition: opacity .2s; white-space: nowrap; }
.strands:hover .r-nm, .strands:focus-within .r-nm, .strands li.is-active .r-nm { opacity: 1; }
.strands li.is-active button { color: var(--stage-text); font-weight: 700; }
.strands li button:hover { color: var(--stage-text); }
.strands li button:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; border-radius: 2px; }

.z-cards { position: absolute; left: var(--content-x); bottom: 112px; width: min(36rem, calc(100% - var(--content-x) - 32px)); z-index: 5; }
.z-card { position: absolute; left: 0; bottom: 0; opacity: 0; transform: translateY(8px); transition: opacity .35s, transform .35s; pointer-events: none; }
.z-card.is-active { opacity: 1; transform: none; }
.z-k { margin: 0 0 10px; font: 400 13px var(--ui); color: var(--stage-muted); }
.z-k .r-n { color: var(--amber); margin-right: 6px; }
.z-card h2 { margin: 0; font: 500 clamp(26px, 2.6vw, 40px)/1.15 var(--serif); font-variation-settings: "opsz" 48; }
.z-chip { margin: 14px 0 0; font: 400 15px var(--ui); color: var(--stage-text); display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.tag { font: 600 11px var(--mono); font-stretch: 75%; letter-spacing: .06em; text-transform: uppercase; padding: 3px 7px; border: 1px solid currentColor; border-radius: 2px; }
.tag { color: var(--stage-text); } .tag-method, .tag-clinic { color: var(--stage-muted); }

.z-controls { position: absolute; left: var(--content-x); right: var(--rail-x); bottom: 36px; z-index: 6; display: flex; align-items: center; gap: var(--s3); font: 400 14px var(--ui); color: var(--stage-muted); }
.z-play { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; padding: 0 16px; border: 1px solid var(--stage-text); border-radius: 4px; background: transparent; color: var(--stage-text); font: 600 15px var(--ui); cursor: pointer; }
.z-play:hover { background: rgba(23,33,43,.06); }
.z-play { background: rgba(255,255,255,.7); }
.z-play svg { width: 14px; height: 14px; fill: currentColor; }
.z-play .i-pause, .z-play[aria-pressed="true"] .i-play { display: none; }
.z-play[aria-pressed="true"] .i-pause { display: inline; }
.z-illus { margin-left: auto; font-size: 12px; }
.z-progress { position: absolute; left: 0; right: 0; bottom: 0; height: 3px; background: rgba(23,33,43,.1); z-index: 6; }
.z-progress i { display: block; height: 100%; width: calc(var(--p, 0) * 100%); background: linear-gradient(90deg, var(--thread-gen), var(--thread-omx)); }

/* hotspots: one per settled scene */
.z-hots { position: absolute; inset: 0; z-index: 4; pointer-events: none; }
.z-hot { position: absolute; width: 56px; height: 56px; margin: -28px 0 0 -28px; border: 0; padding: 0; background: none; cursor: pointer; opacity: 0; transition: opacity .3s; pointer-events: none; }
.z-hot.is-on { opacity: 1; pointer-events: auto; }
.z-hot i { position: absolute; inset: 14px; border-radius: 50%; border: 2px solid var(--stage-text); background: rgba(255,255,255,.9); box-shadow: 0 2px 8px rgba(23,33,43,.25); }
.z-hot i::after { content: "+"; position: absolute; inset: 0; display: grid; place-items: center; font: 700 15px var(--ui); color: var(--stage-text); }
@media (prefers-reduced-motion: no-preference) {
  .z-hot.is-on::before { content: ""; position: absolute; inset: 14px; border-radius: 50%; border: 1.5px solid var(--amber); opacity: 0; animation: ping 2.4s ease-out 2; }   /* 2 pulses (< 5 s, WCAG 2.2.2) each time a scene settles */
  @keyframes ping { from { transform: scale(1); opacity: .9; } to { transform: scale(2.2); opacity: 0; } }
}
.z-hot[aria-expanded="true"] i { background: var(--amber); border-color: var(--ink); }
.z-hot[aria-expanded="true"] i::after { color: var(--ink); }

.z-pop { position: absolute; z-index: 20; width: min(400px, calc(100vw - 32px)); border: 1px solid var(--rule); max-height: calc(100svh - 150px); overflow-y: auto; background: var(--paper); color: var(--ink); border-radius: 4px; padding: 20px 22px 18px; box-shadow: 0 12px 32px rgba(0,0,0,.38); font-family: var(--ui); }
.z-pop h3 { margin: 0 28px 12px 0; font: 600 22px/1.2 var(--serif); }
.z-pop dl { margin: 0; display: grid; grid-template-columns: 84px 1fr; gap: 8px 12px; font-size: 15px; line-height: 1.45; }
.z-pop dt { font: 600 11px var(--mono); font-stretch: 75%; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); padding-top: 3px; }
.z-pop dd { margin: 0; }
.z-pop dt:nth-of-type(3), .z-pop dd.p-limit { background: color-mix(in srgb, var(--amber) 20%, transparent); }
.z-pop dt:nth-of-type(3) { padding-left: 6px; } .z-pop dd.p-limit { padding: 2px 6px; margin-left: -12px; padding-left: 12px; }
.p-close { position: absolute; top: 8px; right: 8px; width: 36px; height: 36px; border: 0; background: none; font: 400 24px var(--ui); color: var(--ink); cursor: pointer; }
.p-src { display: inline-block; margin-top: 14px; font: 600 15px var(--ui); color: var(--gen); }

/* ---------------------------------------------------------------- the brief */
.brief { background: var(--paper); color: var(--ink); padding: var(--s9) 0; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 var(--s9); }
.b-h { margin: 0 0 var(--s6); font: 500 clamp(30px, 3.4vw, 48px)/1.1 var(--serif); font-variation-settings: "opsz" 48; max-width: 22ch; }
.b-rows { display: grid; grid-template-columns: 160px 1fr; gap: var(--s3) var(--s4); margin: 0; border-top: 1px solid var(--ink); padding-top: var(--s3); }
.b-rows dt { font: 600 13px var(--ui); color: var(--muted); padding-top: 4px; }
.b-rows dd { margin: 0; font-size: 19px; max-width: 60ch; }
.s-g { color: var(--gen); } .s-o { color: var(--omx); }
.b-rows .x { margin: 0 8px; color: var(--muted); }
.proof { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.proof a { font: 600 15px var(--ui); color: var(--gen); white-space: nowrap; margin-left: 6px; }
.b-links { margin: var(--s6) 0 0; display: flex; flex-wrap: wrap; gap: var(--s4); font: 600 16px var(--ui); }
.foot { background: var(--paper); color: var(--muted); font: 400 13px var(--ui); padding: 0 0 var(--s4); }
.foot .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; border-top: 1px solid var(--rule); padding-top: var(--s2); }
.z-nojs { background: var(--paper); color: var(--ink); margin: 0; padding: var(--s6) var(--s9); display: grid; gap: 12px; }

/* ---------------------------------------------------------------- phones */
@media (max-width: 760px) {
  :root { --rail-x: 16px; --content-x: 20px; }
  .mast { padding: 12px 16px; flex-wrap: wrap; gap: 6px 12px; }
  .mast nav a { margin-left: 12px; font-size: 13px; }
  .mast nav a:first-child { margin-left: 0; }
  .z-tag { display: none; }                      /* too cramped on phones: the details panel explains the image */
  .z-synth { top: 64px; right: 12px; font-size: 10px; }
  .z-ev { display: none; }
  .z-vignette { background: linear-gradient(0deg, rgba(238,245,245,.96) 0, rgba(238,245,245,.8) 42%, rgba(238,245,245,0) 66%), linear-gradient(180deg, rgba(238,245,245,.85) 0, rgba(238,245,245,0) 22%); }
  .z-title { top: 70px; right: 20px; }
  .z-title h1 { font-size: 34px; }
  .z-title p { font-size: 16px; }
  .strands { top: auto; bottom: 88px; left: 20px; right: 20px; transform: none; }
  .s-legend { display: none; }
  .strands ol { display: flex; justify-content: space-between; }
  .strands ol::before, .strands ol::after { display: none; }
  .strands li button { grid-template-columns: 12px 12px; height: 44px; padding: 0 4px; }
  .strands li .r-n, .strands li .r-nm { display: none; }
  .z-cards { bottom: 150px; width: calc(100% - 40px); }
  .z-card h2 { font-size: 24px; }
  .z-controls { bottom: 24px; gap: 12px; }
  .z-hint { display: none; }
  .z-pop { position: fixed; left: 8px !important; right: 8px; bottom: calc(8px + env(safe-area-inset-bottom)); top: auto !important; width: auto; max-height: 62svh; }
  .wrap { padding: 0 20px; }
  .b-rows { grid-template-columns: 1fr; gap: 6px; }
  .b-rows dd { margin-bottom: var(--s2); }
}

/* landing additions (astra review #3) */
.z-proof { margin: var(--s3) 0 0; font: 400 16px/1.5 var(--ui); max-width: 30rem; color: var(--stage-text); }
.z-proof .tag { margin-right: 8px; }
.z-proof a, .z-ev, .z-cta a { color: var(--stage-text); font-weight: 700; }
.z-ev { font: 600 15px var(--ui); }
.z-scale { color: var(--stage-muted); margin-left: 6px; }
.z-k { color: var(--stage-text); }
.z-more { font: 600 13px var(--ui); color: var(--stage-text); background: none; border: 0; border-bottom: 1px dashed currentColor; padding: 4px 0; cursor: pointer; pointer-events: auto; min-height: 32px; }
.z-card.is-active :is(a, button) { pointer-events: auto; }   /* the caption box itself lets clicks through to the ring */
.z-cta { display: flex; gap: var(--s3); margin: var(--s2) 0 0; font: 600 16px var(--ui); }

.z-sound { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 12px; border: 1px solid rgba(23,33,43,.35); border-radius: 4px; background: transparent; color: var(--stage-text); font: 600 14px var(--ui); cursor: pointer; }
.z-sound svg { width: 16px; height: 16px; fill: currentColor; }
.z-sound[aria-pressed="false"] .w { opacity: .25; }
.z-sound[aria-pressed="true"] { border-color: var(--amber); }
.z-sound.is-blocked { background: var(--amber); border-color: var(--ink); color: var(--ink); }
@media (prefers-reduced-motion: no-preference) { .z-sound.is-blocked { animation: nudge 1.2s ease-in-out 3; } @keyframes nudge { 50% { transform: scale(1.06); } } }
.transcript { margin-top: var(--s6); font: 400 16px/1.5 var(--ui); max-width: 70ch; }
.transcript summary { cursor: pointer; font-weight: 600; }
.transcript ol { padding-left: 1.3em; } .transcript p { color: var(--muted); font-size: 14px; }

/* arc B: dot scenes, organ hotspots, image tags */
.z-tag { position: absolute; transform: translate(-50%, -50%); font: 600 12px var(--ui); color: var(--ink); background: rgba(255,255,255,.9); border: 1px solid var(--rule); padding: 3px 8px; border-radius: 2px; white-space: nowrap; opacity: 0; transition: opacity .3s; pointer-events: none; }
.z-tag.is-on { opacity: 1; }
.z-dots canvas { width: 100%; height: 100%; display: block; }
.z-synth { position: absolute; top: 76px; right: 5%; font: 600 11px var(--mono); font-stretch: 75%; letter-spacing: .06em; text-transform: uppercase; color: var(--ink); background: rgba(255,255,255,.9); border: 1px solid var(--rule); padding: 4px 8px; border-radius: 2px; }
.z-organ.is-left span { left: auto; right: 48px; }
.z-organ span { position: absolute; left: 48px; top: 50%; transform: translateY(-50%); white-space: nowrap; font: 600 12px var(--ui); color: var(--ink); background: rgba(255,255,255,.85); padding: 2px 6px; border-radius: 2px; pointer-events: none; }
.p-pubs { margin: 0; padding-left: 1.1em; display: grid; gap: 4px; }
.p-pubs a { color: var(--gen); }
.z-pop dd.p-limit, .z-pop dt:nth-of-type(3) { background: color-mix(in srgb, var(--amber) 20%, transparent); }

/* figures (published, CC BY): brief mosaic, junction thumbnails, galleries, work column, viewer */
.b-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: var(--s6); align-items: start; }
.b-figs { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s2); }
.fig-link { display: block; color: var(--ink); text-decoration: none; }
.fig-thumb { background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: 8px; transition: box-shadow .2s, transform .2s; }
.fig-thumb img, .wfig img { width: 100%; height: 130px; object-fit: cover; object-position: top; display: block; }
.fig-thumb span { display: block; font: 600 12px var(--ui); margin-top: 6px; }
.fig-thumb:hover, .wfig:hover, .wfig.is-hot { box-shadow: 0 6px 20px rgba(23,33,43,.14); transform: translateY(-2px); }
.sl-thumb { cursor: zoom-in; }
.sl-frame { fill: var(--surface); stroke: var(--rule); stroke-width: 1.5; }
.sl-thumb:hover .sl-frame, .sl-thumb:focus .sl-frame { stroke: var(--ink); stroke-width: 2.5; }
.sl-leader { stroke: var(--muted); stroke-width: 1.2; stroke-dasharray: 3 3; }
.fig-h { margin: var(--s6) 0 var(--s3); font: 500 clamp(24px, 2.4vw, 32px)/1.2 var(--serif); }
.fig-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s4) var(--s3); margin-bottom: var(--s6); align-items: start; }
.fig { margin: 0; background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: var(--s2); }
.fig.is-wide { grid-column: 1 / -1; }
.fig img { width: 100%; height: auto; display: block; cursor: zoom-in; }
.fig figcaption { font: 400 14px/1.5 var(--ui); margin-top: var(--s1); }
.fig-src { color: var(--muted); font-size: 12px; margin-left: 4px; }
.work-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); gap: var(--s6); align-items: start; }
.work-figs { position: sticky; top: 80px; display: grid; grid-template-columns: 1fr 1fr; gap: var(--s2); max-height: calc(100vh - 100px); overflow-y: auto; padding: 4px; }
.wfig { background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: 6px; transition: box-shadow .2s, transform .2s; }
.wfig img { height: 110px; }
.wfig span { display: block; font: 400 11px/1.35 var(--ui); color: var(--muted); margin-top: 4px; }
dialog.lightbox { border: 0; padding: var(--s3); max-width: min(1200px, 96vw); max-height: 94vh; border-radius: 6px; background: var(--surface); box-shadow: 0 20px 60px rgba(0,0,0,.35); }
dialog.lightbox::backdrop { background: rgba(23,33,43,.6); }
dialog.lightbox img { display: block; max-width: 100%; max-height: calc(94vh - 110px); margin: 0 auto; }
.lb-cap { font: 400 15px/1.5 var(--ui); margin: var(--s2) 0 0; max-width: 80ch; }
.lb-close { position: absolute; top: 6px; right: 10px; border: 0; background: none; font: 400 28px var(--ui); cursor: pointer; color: var(--ink); }
@media (max-width: 900px) {
  .b-grid, .work-grid { grid-template-columns: 1fr; }
  .work-figs { position: static; max-height: none; grid-template-columns: repeat(3, 1fr); }
  .fig-grid { grid-template-columns: 1fr; }
}

/* ================================================================ inner pages */
body.page { background: var(--paper); color: var(--ink); }
.mast-light { position: sticky; color: var(--ink); background: color-mix(in srgb, var(--paper) 94%, transparent); border-bottom: 1px solid var(--rule); }
.mast-light nav a[aria-current="page"] { text-decoration: underline; text-decoration-thickness: 2px; opacity: 1; }
.page-main { padding: var(--s6) 0 var(--s9); }
.p-head { max-width: 46rem; margin-bottom: var(--s6); }
.p-head h1 { margin: 0; font: 500 clamp(36px, 4.4vw, 60px)/1.06 var(--serif); font-variation-settings: "opsz" 60; letter-spacing: -.015em; }
.p-meta { margin: 0 0 var(--s2); font: 400 15px var(--ui); color: var(--muted); }
.lede { margin: var(--s3) 0 0; font: 400 21px/1.5 var(--serif); }
.p-sec { padding: var(--s6) 0; border-top: 1px solid var(--rule); }
.p-sec h2, .story-list h2 { margin: 0 0 var(--s3); font: 500 clamp(26px, 2.6vw, 36px)/1.15 var(--serif); font-variation-settings: "opsz" 48; }
.p-intro { max-width: 62ch; }
.caption { font: italic 400 17px/1.5 var(--serif); max-width: 62ch; }
.src { font: 400 14px/1.5 var(--ui); color: var(--muted); max-width: 80ch; }
.src a, .b-links a { color: var(--gen); }
.illus { font: 600 12px var(--mono); font-stretch: 75%; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.plain { max-width: 70ch; padding-left: 1.1em; }
.plain li { margin-bottom: 8px; }
.rows { display: grid; grid-template-columns: 240px 1fr; gap: var(--s3) var(--s4); margin: 0; }
.rows dt { font: 600 17px var(--ui); }
.rows dt .r-n { display: block; font-size: 11px; color: var(--muted); margin-top: 4px; }
.rows dd { margin: 0; max-width: 62ch; }

/* streamline */
.streamline { color: var(--ink); }
svg.sl { width: 100%; height: auto; display: block; overflow: visible; }
.sl-lane { fill: none; stroke-width: 3.2; stroke-linecap: round; }
.sl-lane.gen { stroke: var(--gen); } .sl-lane.omx { stroke: var(--omx); }
.sl-rail { stroke: #7A7F7C; stroke-width: 1.4; fill: none; }
.sl-loop { fill: none; stroke: currentColor; stroke-width: 1.4; stroke-dasharray: 5 4; }
.sl-lbl { font: 600 12px var(--mono); font-stretch: 75%; letter-spacing: .06em; fill: var(--ink); }
.sl-lbl.gen { fill: var(--gen); } .sl-lbl.omx { fill: var(--omx); } .sl-lbl.m { fill: var(--muted); }
.sl-j .hit { fill: transparent; }
.sl-j .ring { fill: var(--surface); stroke: var(--ink); stroke-width: 1.6; }
.sl-j .sel { fill: var(--amber); opacity: 0; }
.sl-j .num { font: 700 12px var(--mono); font-stretch: 75%; fill: var(--ink); pointer-events: none; }
.sl-j .jl { font: 600 14px var(--ui); fill: var(--ink); pointer-events: none; }
.sl-j[role="button"] { cursor: pointer; }
.sl-j[aria-pressed="true"] .sel { opacity: 1; }
.sl-j[aria-pressed="true"] .ring { stroke-width: 3; }
.sl-j:focus-visible { outline: none; } .sl-j:focus-visible .ring { stroke-width: 3; stroke-dasharray: 3 2; }
.sl-j.is-dim { opacity: .3; }
.will-draw .sl-lane { stroke-dasharray: 1; stroke-dashoffset: 1; }
.will-draw.is-drawn .sl-lane { transition: stroke-dashoffset 1.8s cubic-bezier(.2,.7,.2,1); stroke-dashoffset: 0; }
.will-draw.is-drawn .sl-lane.omx { transition-delay: .25s; }
.sl-btns { display: none; }
.sl-jt { margin: var(--s3) 0 0; font: 600 15px var(--ui); }
.sl-jt .r-n { font-size: 12px; color: var(--muted); margin-right: 8px; }
.sl-panel { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s4); border-top: 1px solid var(--ink); padding-top: var(--s2); margin-top: var(--s2); }
.sl-panel h3 { font: 600 13px var(--ui); margin: 0 0 4px; display: flex; gap: 8px; align-items: center; }
.sl-panel p { margin: 0; font-size: 17px; line-height: 1.5; }
.sl-limit { background: color-mix(in srgb, var(--amber) 18%, transparent); padding: 10px 12px; }
.dia { width: 10px; height: 10px; background: var(--gen); transform: rotate(45deg); display: inline-block; flex: none; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--omx); display: inline-block; flex: none; }

/* evidence matrix: shape-first states, all ink */
.legend { display: flex; flex-wrap: wrap; gap: var(--s3); font: 400 14px var(--ui); }
.state { display: inline-flex; align-items: center; gap: 8px; }
.g { width: 14px; height: 14px; display: inline-block; border: 1.6px solid var(--ink); flex: none; }
.g.sup { background: var(--ink); } .g.unt { background: transparent; }
.g.inc { background: linear-gradient(90deg, var(--ink) 50%, transparent 50%); }
.g.con { border: none; position: relative; }
.g.con::before, .g.con::after { content: ""; position: absolute; left: 6px; top: -1px; width: 2px; height: 16px; background: var(--ink); transform: rotate(45deg); }
.g.con::after { transform: rotate(-45deg); }
.tbl-wrap { overflow-x: auto; }
table.matrix { border-collapse: collapse; width: 100%; min-width: 640px; font: 400 15px var(--ui); }
table.matrix th, table.matrix td { padding: 12px; border-bottom: 1px solid var(--rule); text-align: left; }
table.matrix thead th { font-size: 13px; border-bottom: 1px solid var(--ink); }

/* DiD demo */
.did { background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: var(--s3); }
.did-controls { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s3); font: 600 14px var(--ui); }
.did-controls label { display: grid; gap: 6px; }
.did-controls output { font: 400 13px var(--mono); font-stretch: 75%; color: var(--muted); }
.did-controls input { width: 100%; accent-color: var(--ink); min-height: 32px; }
.did-plot { width: 100%; max-width: 860px; height: auto; margin-top: var(--s3); }
.did-lbl, .did-axis, .did-num { font: 400 13px var(--ui); fill: var(--ink); }
.did-axis { fill: var(--muted); font-size: 12px; }
.did-num { font: 400 12px var(--mono); font-stretch: 75%; }
.did-zero { stroke: var(--ink); stroke-width: 1; }
.did-axis-line { stroke: var(--rule); stroke-width: 1; }
.did-true { stroke: var(--amber); stroke-width: 2; stroke-dasharray: 4 3; }
.did-ci { stroke-width: 3; } .did-ci.naive { stroke: var(--muted); } .did-ci.did { stroke: var(--ink); }
.did-pt.naive { fill: var(--surface); stroke: var(--muted); stroke-width: 2.5; } .did-pt.did { fill: var(--ink); }
.did-read { font: 400 16px/1.5 var(--ui); margin: var(--s2) 0 0; }

/* stories */
.story-list { display: grid; gap: var(--s6); }
.story-link { display: block; text-decoration: none; color: inherit; padding: var(--s3) 0; border-top: 1px solid var(--rule); }
.story-link:hover h2 { text-decoration: underline; text-underline-offset: 5px; }
.story-link p { font: 400 15px var(--ui); color: var(--muted); margin: 0; }
.story-grid { display: grid; grid-template-columns: 7fr 1fr 4fr; margin: var(--s6) 0; }
.story-body { grid-column: 1; font-size: 19px; }
.story-body p { max-width: 62ch; }
.note { grid-column: 3; align-self: start; font: 400 15px/1.5 var(--ui); border-top: 1px solid var(--ink); padding-top: 10px; }
.contrib { font: 400 16px/1.5 var(--ui); }
.chain { margin: 0 0 var(--s6); }
.chain ol { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; counter-reset: c; }
.chain li { position: relative; padding: var(--s2) var(--s3) var(--s2) 0; border-top: 3px solid var(--ink); font: 400 15px/1.35 var(--ui); }
.chain li::after { content: "→"; position: absolute; right: 8px; top: 12px; color: var(--muted); }
.chain li:last-child::after { content: none; }
.chain b { display: block; font: 500 28px/1.1 var(--serif); margin-bottom: 4px; }
.chain b.r-n { font: 600 26px/1.1 var(--mono); font-stretch: 75%; }
.chain li > span { display: block; color: var(--muted); font-size: 13px; margin-top: 4px; }
.chain figcaption { font: 400 13px var(--ui); color: var(--muted); margin-top: var(--s1); }

/* work: timetable + list */
.view-toggle { margin-top: var(--s3); font: 600 14px var(--ui); background: none; border: 1px solid var(--ink); border-radius: 4px; padding: 8px 14px; cursor: pointer; color: var(--ink); min-height: 40px; }
.tt { display: grid; grid-template-columns: 170px repeat(var(--cols), 1fr); margin-bottom: var(--s6); font: 400 14px var(--ui); overflow-x: auto; }
.tt[hidden] { display: none; }
.tt-row { display: contents; }
.tt-row > span { border-bottom: 1px solid var(--rule); padding: 10px 6px; min-height: 48px; display: flex; flex-direction: column; gap: 6px; justify-content: center; }
.tt-head > span { font-size: 12px; color: var(--muted); border-bottom: 1px solid var(--ink); min-height: 0; }
.tt-o { font-weight: 700; }
.stop { display: inline-flex; align-items: center; gap: 5px; font-size: 13px; color: var(--ink); text-decoration: none; }
.stop:hover span { text-decoration: underline; }
.stop .dia, .stop .dot { width: 9px; height: 9px; }
.pubs { padding-left: 1.4em; display: grid; gap: 14px; font: 400 16px/1.5 var(--ui); max-width: 80ch; }
.pubs .t b { font-weight: 700; }
.pubs .role { font: 600 11px var(--mono); font-stretch: 75%; letter-spacing: .05em; text-transform: uppercase; color: var(--muted); margin-left: 6px; }
.pubs a { color: var(--gen); font-weight: 600; margin-left: 6px; }
.pubs li:target { background: color-mix(in srgb, var(--amber) 18%, transparent); }

/* about */
.timeline { list-style: none; margin: 0 0 var(--s6); padding: 0; border-left: 2px solid var(--ink); }
.timeline li { position: relative; padding: 0 0 var(--s3) var(--s4); font: 400 16px/1.5 var(--ui); max-width: 70ch; }
.timeline li::before { content: ""; position: absolute; left: -7px; top: 6px; width: 12px; height: 12px; border-radius: 50%; background: var(--paper); border: 2px solid var(--ink); }
.timeline .r-n { display: block; font-size: 12px; color: var(--muted); }
.timeline b { display: block; font: 600 19px var(--serif); }
.timeline .lane { display: block; font: 600 11px var(--mono); font-stretch: 75%; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin-top: 2px; }

@media (max-width: 760px) {
  .sl-panel, .did-controls { grid-template-columns: 1fr; }
  .sl-j .jl, .sl-lbl.m { display: none; }
  .sl-btns { display: flex; flex-wrap: wrap; gap: 8px; margin-top: var(--s2); }
  .sl-btns button { font: 600 14px var(--ui); min-height: 44px; padding: 0 12px; border: 1px solid var(--ink); border-radius: 4px; background: var(--surface); color: var(--ink); }
  .sl-btns button[aria-pressed="true"] { background: var(--amber); }
  .rows { grid-template-columns: 1fr; gap: 6px; }
  .rows dd { margin-bottom: var(--s2); }
  .story-grid { grid-template-columns: 1fr; }
  .note { grid-column: 1; margin-top: var(--s3); }
  .chain ol { grid-template-columns: 1fr; }
  .chain li::after { content: "↓"; right: 0; }
  .tt { grid-template-columns: 110px repeat(var(--cols), minmax(90px, 1fr)); }
}