@font-face {
  font-family: "Ramesha";
  src: url("assets/fonts/Ramesha-Regular.woff2") format("woff2");
  font-weight: 500;
  font-display: swap;
}

@font-face {
  font-family: "Ramesha";
  src: url("assets/fonts/Ramesha-Bold.woff2") format("woff2");
  font-weight: 700;
  font-display: swap;
}

:root {
  --ink: #171a18;
  --ink-soft: #303531;
  --paper: #f1eee6;
  --paper-deep: #e6e1d6;
  --surface: #f8f6f0;
  --line: #cbc5b8;
  --muted: #74766f;
  --sage: #6d8176;
  --sage-light: #a8b7ae;
  --copper: #a67b55;
  --ivory: #fffdf7;
  --red: #8e4f45;
  --max: 1440px;
  --rail: 270px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}
body::selection { background: var(--sage); color: white; }
button, select { font: inherit; }
button { color: inherit; }
img { display: block; max-width: 100%; }
h1, h2, h3, p { margin-top: 0; }
h1, h2 { font-family: "Ramesha", Georgia, serif; font-weight: 700; }
h1 { margin-bottom: 24px; font-size: clamp(3.3rem, 6vw, 7.2rem); line-height: .84; letter-spacing: -.035em; }
h2 { margin-bottom: 16px; font-size: clamp(2rem, 3.4vw, 4rem); line-height: .95; letter-spacing: -.02em; }
h3 { margin-bottom: 10px; font-size: 1.12rem; line-height: 1.2; }

.skip-link { position: fixed; z-index: 100; top: 12px; left: 12px; transform: translateY(-140%); padding: 10px 14px; background: var(--ink); color: white; }
.skip-link:focus { transform: translateY(0); }

.library-rail {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 30;
  width: var(--rail);
  display: flex;
  flex-direction: column;
  padding: 34px 26px 26px;
  background: var(--ink);
  color: var(--ivory);
  border-right: 1px solid rgba(255,255,255,.08);
}
.rail-brand img { width: 176px; filter: none; }
.rail-brand p { margin: 8px 0 0 3px; color: rgba(255,255,255,.44); font-size: .69rem; letter-spacing: .14em; text-transform: uppercase; }
.rail-nav { display: grid; gap: 2px; margin-top: 66px; }
.nav-item {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 10px;
  width: 100%;
  padding: 14px 10px;
  border: 0;
  border-bottom: 1px solid rgba(255,255,255,.08);
  background: transparent;
  color: rgba(255,255,255,.56);
  text-align: left;
  cursor: pointer;
  transition: color .2s ease, padding-left .2s ease, background .2s ease;
}
.nav-item span { color: rgba(255,255,255,.3); font-size: .68rem; letter-spacing: .08em; }
.nav-item:hover, .nav-item.is-active { color: white; padding-left: 15px; background: rgba(255,255,255,.04); }
.nav-item.is-active span { color: var(--sage-light); }
.rail-note { margin-top: auto; display: flex; gap: 11px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.1); }
.status-dot { width: 7px; height: 7px; margin-top: 7px; border-radius: 50%; background: var(--copper); box-shadow: 0 0 0 5px rgba(166,123,85,.12); }
.rail-note strong { font-size: .7rem; letter-spacing: .12em; }
.rail-note p { margin: 3px 0 0; color: rgba(255,255,255,.42); font-size: .7rem; }

.workspace { min-height: 100vh; margin-left: var(--rail); }
.workspace-header {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 clamp(24px, 4.5vw, 72px);
  border-bottom: 1px solid var(--line);
  background: rgba(241,238,230,.92);
  backdrop-filter: blur(14px);
}
.breadcrumb, .edition { margin: 0; color: var(--muted); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; }
.breadcrumb span { margin: 0 7px; color: var(--copper); }
.header-meta { display: flex; align-items: center; gap: 16px; }
.demo-badge { padding: 7px 10px; border: 1px solid var(--copper); color: #755234; font-size: .66rem; font-weight: 800; letter-spacing: .1em; }

.view { width: min(100%, var(--max)); min-height: calc(100vh - 138px); margin: 0 auto; padding: clamp(54px, 7vw, 104px) clamp(24px, 5vw, 82px); animation: reveal .35s ease; }
.view[hidden] { display: none; }
@keyframes reveal { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.eyebrow { margin-bottom: 13px; color: var(--sage); font-size: .68rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.lede { max-width: 720px; margin-bottom: 0; color: var(--muted); font-size: clamp(1.02rem, 1.4vw, 1.22rem); }
.view-intro { margin-bottom: clamp(44px, 7vw, 86px); }
.dashboard-intro, .compact-intro, .archive-intro, .case-header { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(260px, .55fr); align-items: end; gap: clamp(30px, 6vw, 90px); }
.intro-index, .case-id { padding: 26px 0 6px 30px; border-left: 1px solid var(--line); }
.intro-index span, .case-id span { display: block; color: var(--muted); font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; }
.intro-index strong, .case-id strong { display: block; margin: 12px 0 7px; font-family: "Ramesha", Georgia, serif; font-size: 2.4rem; }
.intro-index small, .case-id small { color: var(--copper); font-size: .72rem; }

.collection-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.collection-card { min-height: 240px; display: flex; flex-direction: column; justify-content: space-between; align-items: flex-start; padding: 22px; border: 0; border-right: 1px solid var(--line); background: transparent; text-align: left; }
button.collection-card { cursor: pointer; transition: background .2s ease, color .2s ease; }
button.collection-card:hover { background: var(--ink); color: white; }
.collection-card:last-child { border-right: 0; }
.collection-number { font-family: "Ramesha", Georgia, serif; font-size: 2.3rem; color: var(--copper); }
.collection-card p { margin: 0 0 7px; font-weight: 700; }
.collection-card small { display: block; color: var(--muted); font-size: .76rem; }
button.collection-card:hover small { color: rgba(255,255,255,.56); }
.arrow { align-self: flex-end; color: var(--muted); }

.dashboard-feature { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(300px, .75fr); margin-top: clamp(58px, 8vw, 110px); background: var(--ink); color: white; }
.feature-visual { min-height: 520px; }
.image-stage { position: relative; overflow: hidden; background: radial-gradient(circle at 55% 48%, #4b5c55 0, #28302d 26%, #171a18 63%, #101210 100%); }
.generated-anatomy { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity .3s ease; }
.generated-anatomy.is-loaded { opacity: .88; }
.generated-anatomy.is-loaded + .placeholder-anatomy { opacity: 0; }
.placeholder-anatomy { position: absolute; inset: 0; transition: opacity .3s ease; }
.placeholder-anatomy::before, .placeholder-anatomy::after { content: ""; position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%); border: 1px solid rgba(255,255,255,.22); border-radius: 45% 55% 52% 48%; }
.placeholder-anatomy::before { width: 42%; height: 55%; box-shadow: 0 0 70px rgba(109,129,118,.35); }
.placeholder-anatomy::after { width: 22%; height: 30%; border-color: rgba(166,123,85,.65); transform: translate(-50%,-50%) rotate(35deg); }
.orbit, .axis { position: absolute; display: block; }
.orbit { border: 1px solid rgba(168,183,174,.25); border-radius: 50%; }
.orbit-a { width: 65%; height: 28%; left: 18%; top: 35%; transform: rotate(-18deg); }
.orbit-b { width: 32%; height: 74%; left: 36%; top: 13%; transform: rotate(22deg); }
.axis { background: rgba(255,255,255,.12); }
.axis-a { width: 1px; height: 76%; left: 50%; top: 12%; }
.axis-b { height: 1px; width: 72%; left: 14%; top: 50%; }
.image-stage figcaption { position: absolute; left: 26px; bottom: 25px; z-index: 2; }
.image-stage figcaption span { display: block; color: var(--sage-light); font-size: .66rem; letter-spacing: .1em; text-transform: uppercase; }
.image-stage figcaption strong { display: block; margin-top: 5px; font-size: .88rem; }
.visual-watermark { position: absolute; z-index: 2; top: 20px; right: 20px; padding: 6px 9px; border: 1px solid rgba(255,255,255,.38); color: rgba(255,255,255,.72); font-size: .6rem; font-weight: 800; letter-spacing: .12em; }
.feature-copy { padding: clamp(38px, 5vw, 70px); align-self: center; }
.feature-copy p:not(.eyebrow), .anatomy-index > p:not(.eyebrow) { color: rgba(255,255,255,.6); }
.relationship-list { margin: 34px 0 0; }
.relationship-list div { display: flex; justify-content: space-between; gap: 20px; padding: 12px 0; border-top: 1px solid rgba(255,255,255,.12); }
.relationship-list dt { color: rgba(255,255,255,.52); font-size: .78rem; }
.relationship-list dd { margin: 0; color: var(--sage-light); font-weight: 800; }

.compact-intro h1, .archive-intro h1 { font-size: clamp(3.3rem, 5.6vw, 6.5rem); }
.filter-bar { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-bottom: 36px; background: var(--line); border: 1px solid var(--line); }
.filter-bar label { padding: 12px 15px 9px; background: var(--surface); color: var(--muted); font-size: .62rem; font-weight: 750; letter-spacing: .09em; text-transform: uppercase; }
.filter-bar select { width: 100%; margin-top: 7px; border: 0; background: transparent; color: var(--ink); font-size: .82rem; outline: none; }
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card { min-width: 0; background: var(--surface); border: 1px solid var(--line); }
.case-visual, .imaging-frame { position: relative; overflow: hidden; display: flex; align-items: flex-end; justify-content: space-between; padding: 18px; color: rgba(255,255,255,.7); min-height: 220px; background-color: #1d2220; }
.visual-left, .visual-center, .visual-right {
  background-image: linear-gradient(180deg, rgba(12,15,14,.04), rgba(12,15,14,.68)), url("assets/neuro-visual-atlas.png");
  background-repeat: no-repeat;
  background-size: 306% 100%;
}
.visual-left { background-position: left center; }
.visual-center { background-position: center center; }
.visual-right { background-position: right center; }
.case-visual::before, .imaging-frame::before { content: ""; position: absolute; inset: 12% 20%; border: 1px solid rgba(255,255,255,.22); border-radius: 48%; box-shadow: inset 0 0 40px rgba(255,255,255,.06), 0 0 60px rgba(109,129,118,.22); }
.case-visual::after, .imaging-frame::after { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px); background-size: 32px 32px; }
.scan-a { background: radial-gradient(ellipse at 54% 48%, #87958c 0, #3c4842 18%, #1a211e 49%, #101310 100%); }
.scan-b { background: radial-gradient(ellipse at 45% 52%, #886b58 0, #4c3930 14%, #242a27 43%, #111311 100%); }
.scan-c { background: radial-gradient(circle at 50% 50%, #788b83 0, #27332e 25%, #181c1a 51%, #101210 100%); }
.case-visual span, .case-visual strong, .imaging-frame span, .imaging-frame strong { position: relative; z-index: 2; font-size: .62rem; letter-spacing: .08em; text-transform: uppercase; }
.case-body { padding: 24px; }
.case-kicker { display: flex; justify-content: space-between; margin-bottom: 22px; color: var(--muted); font-size: .65rem; letter-spacing: .09em; text-transform: uppercase; }
.case-body h2 { min-height: 72px; font-size: 2rem; }
.case-body > p { min-height: 62px; color: var(--muted); font-size: .84rem; }
.tag-list, .structure-chips { display: flex; flex-wrap: wrap; gap: 7px; margin: 22px 0; }
.tag-list span, .structure-chips span { padding: 6px 8px; border: 1px solid var(--line); color: var(--muted); font-size: .62rem; }
.text-link { padding: 0; border: 0; background: transparent; font-size: .75rem; font-weight: 800; cursor: pointer; }
.empty-state { padding: 48px; text-align: center; color: var(--muted); border: 1px dashed var(--line); }

.case-header { padding-bottom: 46px; border-bottom: 1px solid var(--line); }
.case-header h1 { max-width: 900px; font-size: clamp(3.2rem, 5.5vw, 6.6rem); }
.case-layout { display: grid; grid-template-columns: minmax(0, 1fr) 270px; gap: clamp(34px, 5vw, 76px); margin-top: 54px; }
.case-main { min-width: 0; }
.case-section { display: grid; grid-template-columns: 55px minmax(0, 1fr); gap: 26px; padding: 42px 0; border-bottom: 1px solid var(--line); }
.section-number { margin: 0; color: var(--copper); font-family: "Ramesha", Georgia, serif; font-size: 1.4rem; }
.case-section h2 { font-size: clamp(2rem, 3vw, 3.3rem); }
.case-section p:not(.eyebrow):not(.section-number) { max-width: 760px; color: var(--muted); }
.imaging-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 28px; }
.imaging-frame { min-height: 300px; margin: 0; }
.video-study { margin: 50px 0; }
.video-frame { position: relative; min-height: 520px; display: grid; place-items: center; overflow: hidden; background-color: #111411; color: white; }
.video-frame.visual-right { background-size: 150% auto; background-position: right center; }
.video-grid-overlay { position: absolute; inset: 0; opacity: .35; background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px); background-size: 44px 44px; }
.video-center-mark { position: absolute; width: 52%; height: 56%; border: 1px solid rgba(255,255,255,.13); border-radius: 46% 54% 50% 50%; transform: rotate(-8deg); }
.video-center-mark::before { content: ""; position: absolute; inset: 24%; border: 1px solid rgba(166,123,85,.55); border-radius: 50%; }
.video-frame > p { position: absolute; left: 20px; bottom: 14px; color: rgba(255,255,255,.48); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; }
.play-button { position: relative; z-index: 2; width: 68px; height: 68px; border: 1px solid rgba(255,255,255,.55); border-radius: 50%; background: rgba(0,0,0,.28); color: white; cursor: pointer; }
.timeline { position: relative; height: 118px; margin-top: 12px; }
.timeline-track { position: absolute; left: 4%; right: 4%; top: 27px; height: 1px; background: var(--line); }
.timeline-progress { display: block; width: 5%; height: 1px; background: var(--copper); transition: width .25s ease; }
.timeline-marker { position: absolute; top: 17px; left: var(--position); width: 110px; transform: translateX(-50%); padding-top: 25px; border: 0; background: transparent; color: var(--muted); font-size: .62rem; text-align: center; cursor: pointer; }
.timeline-marker::before { content: ""; position: absolute; top: 6px; left: calc(50% - 5px); width: 9px; height: 9px; border: 1px solid var(--muted); border-radius: 50%; background: var(--paper); }
.timeline-marker span { display: none; }
.timeline-marker.is-active { color: var(--ink); font-weight: 800; }
.timeline-marker.is-active::before { background: var(--copper); border-color: var(--copper); box-shadow: 0 0 0 5px rgba(166,123,85,.13); }
.annotation-panel { display: grid; grid-template-columns: 82px 1fr auto; gap: 20px; align-items: start; padding: 20px; border: 1px solid var(--line); background: var(--surface); }
.annotation-time, .annotation-label { color: var(--copper); font-size: .62rem; letter-spacing: .08em; text-transform: uppercase; }
.annotation-panel strong { font-size: .84rem; }
.annotation-panel p { margin: 4px 0 0; color: var(--muted); font-size: .76rem; }
.two-column-section { grid-template-columns: 55px 1fr 1fr; }
.note-list, .reference-list { padding-left: 18px; color: var(--muted); font-size: .8rem; }
.note-list li, .reference-list li { padding: 8px 0; border-bottom: 1px solid var(--line); }
.case-aside { position: sticky; top: 28px; align-self: start; padding: 26px; background: var(--ink); color: white; }
.case-aside dl { margin: 26px 0; }
.case-aside dl div { padding: 11px 0; border-top: 1px solid rgba(255,255,255,.12); }
.case-aside dt { color: rgba(255,255,255,.44); font-size: .63rem; letter-spacing: .08em; text-transform: uppercase; }
.case-aside dd { margin: 4px 0 0; font-size: .78rem; }
.aside-warning { margin: 28px 0 0; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.16); color: var(--copper); font-size: .64rem; line-height: 1.6; }

.anatomy-feature { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(300px, .75fr); min-height: 650px; background: var(--ink); color: white; }
.anatomy-stage { min-height: 650px; margin: 0; }
.anatomy-stage figcaption { left: 24px; bottom: 22px; color: rgba(255,255,255,.65); font-size: .72rem; }
.model-stage { position: relative; overflow: hidden; background: radial-gradient(circle at 50% 40%, #46564f 0, #252d29 42%, #111411 100%); }
.model-stage model-viewer { position: absolute; inset: 0; width: 100%; height: 100%; --poster-color: transparent; }
.model-grid { position: absolute; inset: 0; pointer-events: none; opacity: .28; background-image: linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px); background-size: 42px 42px; }
.model-loading { position: absolute; inset: 0; display: grid; place-content: center; justify-items: center; gap: 16px; color: rgba(255,255,255,.72); background: radial-gradient(circle at 50% 45%, #46564f 0, #171a18 70%); }
.model-loading span { width: 38px; height: 38px; border: 1px solid rgba(255,255,255,.18); border-top-color: var(--copper); border-radius: 50%; animation: model-spin 1.1s linear infinite; }
.model-loading p { margin: 0; font-size: .67rem; letter-spacing: .1em; text-transform: uppercase; }
.model-progress { position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: rgba(255,255,255,.1); }
.model-progress span { display: block; width: 38%; height: 100%; background: var(--copper); animation: model-load 1.8s ease-in-out infinite; }
.model-controls { position: absolute; z-index: 5; left: 20px; top: 20px; display: flex; flex-wrap: wrap; gap: 7px; max-width: calc(100% - 210px); }
.model-controls button { padding: 8px 10px; border: 1px solid rgba(255,255,255,.28); background: rgba(23,26,24,.72); backdrop-filter: blur(8px); color: rgba(255,255,255,.78); font-size: .61rem; letter-spacing: .07em; text-transform: uppercase; cursor: pointer; transition: border-color .2s ease, background .2s ease, color .2s ease; }
.model-controls button:hover, .model-controls button:focus-visible, .model-controls button.is-active { border-color: var(--copper); background: rgba(166,123,85,.24); color: white; }
@keyframes model-spin { to { transform: rotate(360deg); } }
@keyframes model-load { 0% { width: 0; } 50% { width: 72%; } 100% { width: 100%; } }
.anatomy-index { align-self: center; padding: clamp(38px, 5vw, 70px); }
.anatomy-pin { position: absolute; z-index: 4; width: 32px; height: 32px; display: grid; place-items: center; border: 1px solid white; border-radius: 50%; background: rgba(23,26,24,.78); color: white; cursor: pointer; box-shadow: 0 0 0 5px rgba(255,255,255,.08); }
.anatomy-pin span { font-size: .58rem; }
.pin-a { left: 45%; top: 29%; }.pin-b { left: 59%; top: 55%; }.pin-c { left: 33%; top: 62%; }
.anatomy-card-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 30px; border: 1px solid var(--line); }
.anatomy-card-grid article { min-height: 440px; padding: 0 28px 28px; border-right: 1px solid var(--line); }
.anatomy-card-grid article:last-child { border-right: 0; }
.anatomy-card-thumb { height: 170px; margin: 0 -28px 24px; border-bottom: 1px solid var(--line); background-color: var(--ink); }
.anatomy-card-grid article > span { color: var(--copper); font-family: "Ramesha", Georgia, serif; font-size: 2rem; }
.anatomy-card-grid h3 { margin-top: 32px; font-family: "Ramesha", Georgia, serif; font-size: 2rem; }
.anatomy-card-grid article > p:not(.eyebrow) { color: var(--muted); font-size: .8rem; }
.anatomy-card-grid small { display: block; margin-top: 30px; color: var(--sage); }

.archive-flow { display: grid; grid-template-columns: 1fr 52px 1fr 52px 1fr; align-items: stretch; }
.flow-stage { min-height: 450px; padding: 32px; border: 1px solid var(--line); background: var(--surface); }
.flow-index { color: var(--copper); font-family: "Ramesha", Georgia, serif; font-size: 2rem; }
.flow-stage .eyebrow { margin-top: 55px; }
.flow-stage h2 { font-size: 2.7rem; }
.flow-stage ul { margin: 30px 0 0; padding: 0; list-style: none; }
.flow-stage li { padding: 10px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: .78rem; }
.flow-stage small { display: block; margin-top: 25px; color: var(--muted); }
.raw-stage { background: var(--ink); color: white; }
.source-stack { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 32px; }
.source-stack span { padding: 13px; border: 1px solid rgba(255,255,255,.14); color: rgba(255,255,255,.65); font-size: .76rem; }
.raw-stage small { color: rgba(255,255,255,.4); }
.library-stage { background: var(--paper-deep); }
.library-map { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin-top: 32px; background: var(--line); }
.library-map span { padding: 16px; background: var(--surface); font-size: .76rem; }
.flow-arrow { display: grid; place-items: center; color: var(--copper); font-size: 1.4rem; }
.outputs-section { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(40px, 7vw, 110px); margin-top: 100px; padding-top: 70px; border-top: 1px solid var(--line); }
.output-list article { display: grid; grid-template-columns: 42px 1fr 1fr; gap: 20px; padding: 18px 0; border-top: 1px solid var(--line); }
.output-list article > span { color: var(--copper); }
.output-list h3, .output-list p { margin: 0; }
.output-list p { color: var(--muted); font-size: .78rem; }
.closing-statement { display: flex; align-items: center; gap: 32px; margin-top: 90px; padding: 45px; background: var(--ink); color: white; }
.closing-statement img { width: 76px; filter: none; opacity: .9; }
.closing-statement p { margin: 0; font-family: "Ramesha", Georgia, serif; font-size: clamp(1.6rem, 3vw, 3rem); line-height: 1.1; }
.closing-statement strong { color: var(--sage-light); }

.concept-footer { display: flex; justify-content: space-between; gap: 24px; padding: 25px clamp(24px, 5vw, 82px); border-top: 1px solid var(--line); color: var(--muted); font-size: .65rem; letter-spacing: .06em; text-transform: uppercase; }
.concept-footer p { margin: 0; }

@media (max-width: 1180px) {
  :root { --rail: 230px; }
  .library-rail { padding-right: 18px; padding-left: 18px; }
  .collection-grid { grid-template-columns: repeat(3, 1fr); }
  .collection-card:nth-child(3) { border-right: 0; }
  .collection-card:nth-child(n+4) { border-top: 1px solid var(--line); }
  .case-grid { grid-template-columns: 1fr 1fr; }
  .archive-flow { grid-template-columns: 1fr; gap: 12px; }
  .flow-arrow { transform: rotate(90deg); }
}

@media (max-width: 860px) {
  :root { --rail: 0px; }
  .library-rail { position: sticky; top: 0; width: 100%; height: auto; padding: 14px 18px 0; }
  .rail-brand { display: none; }
  .rail-nav { display: flex; gap: 2px; margin: 0; overflow-x: auto; scrollbar-width: none; }
  .nav-item { min-width: 158px; display: block; padding: 11px 12px; border: 0; border-bottom: 2px solid transparent; font-size: .72rem; }
  .nav-item span { display: block; margin-bottom: 3px; }
  .nav-item:hover, .nav-item.is-active { padding-left: 12px; border-bottom-color: var(--copper); }
  .rail-note { display: none; }
  .workspace { margin-left: 0; }
  .workspace-header { height: 58px; }
  .dashboard-intro, .compact-intro, .archive-intro, .case-header, .dashboard-feature, .anatomy-feature, .outputs-section { grid-template-columns: 1fr; }
  .intro-index, .case-id { padding-left: 0; border-left: 0; }
  .collection-grid { grid-template-columns: 1fr 1fr; }
  .collection-card:nth-child(odd) { border-right: 1px solid var(--line); }
  .collection-card:nth-child(even) { border-right: 0; }
  .collection-card:nth-child(n+3) { border-top: 1px solid var(--line); }
  .case-grid { grid-template-columns: 1fr; }
  .case-layout { grid-template-columns: 1fr; }
  .case-aside { position: static; }
  .two-column-section { grid-template-columns: 55px 1fr; }
  .two-column-section > div:last-child { grid-column: 2; }
  .anatomy-card-grid { grid-template-columns: 1fr; }
  .anatomy-card-grid article { border-right: 0; border-bottom: 1px solid var(--line); }
  .output-list article { grid-template-columns: 35px 1fr; }
  .output-list article p { grid-column: 2; }
}

@media (max-width: 620px) {
  .workspace-header { align-items: center; padding: 0 16px; }
  .breadcrumb { display: none; }
  .header-meta { width: 100%; justify-content: space-between; }
  .view { padding: 48px 18px 62px; }
  h1 { font-size: clamp(2.8rem, 15vw, 4.5rem); }
  .collection-grid { grid-template-columns: 1fr; }
  .collection-card { min-height: 180px; border-right: 0 !important; border-top: 1px solid var(--line); }
  .collection-card:first-child { border-top: 0; }
  .feature-visual, .anatomy-stage { min-height: 430px; }
  .model-controls { max-width: calc(100% - 40px); }
  .filter-bar { grid-template-columns: 1fr 1fr; }
  .imaging-grid { grid-template-columns: 1fr; }
  .video-frame { min-height: 360px; }
  .timeline { height: 160px; overflow-x: auto; }
  .timeline-track { left: 35px; right: 35px; }
  .timeline-marker { width: 80px; }
  .annotation-panel { grid-template-columns: 1fr; }
  .case-section, .two-column-section { grid-template-columns: 1fr; }
  .two-column-section > div:last-child { grid-column: auto; }
  .section-number { margin-bottom: -10px; }
  .flow-stage { min-height: 360px; }
  .closing-statement { align-items: flex-start; padding: 28px; }
  .closing-statement img { width: 48px; }
  .concept-footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}