:root {
  --white: #fff;
  --paper: #faf9f8;
  --ink: #272124;
  --muted: #777074;
  --line: #ded9db;
  --red: #86172a;
  --red-soft: #f5e9eb;
  --gold: #b4935c;
  --gold-soft: #f3ede3;
  --pink: #c9929d;
  --pink-soft: #f5eaec;
  --green: #81917c;
  --green-soft: #ebefea;
  --sand: #c9a58e;
  --sand-soft: #f4ece7;
  --blue: #7d8d99;
  --blue-soft: #eaeff2;
  --max: 1580px;
  --header: 72px;
  color-scheme: light;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); }
a { color: inherit; text-decoration: none; }
button { font: inherit; }

.skip-link {
  position: fixed; left: 16px; top: -80px; z-index: 100;
  padding: 10px 14px; color: var(--white); background: var(--red);
}
.skip-link:focus { top: 12px; }

.site-header {
  position: fixed; inset: 0 0 auto; z-index: 30;
  height: var(--header); display: grid; grid-template-columns: 1fr auto 1fr;
  align-items: center; padding: 0 clamp(24px, 4vw, 72px);
  background: rgba(255,255,255,.9); border-bottom: 1px solid rgba(39,33,36,.08);
  backdrop-filter: blur(18px);
}
.brand { font: 650 19px/1 Georgia, serif; letter-spacing: -.03em; justify-self: start; }
.brand-dot { color: var(--red); }
.header-center { font-size: 10px; letter-spacing: .22em; color: var(--muted); }
.header-link { justify-self: end; font-size: 12px; border-bottom: 1px solid var(--ink); padding-bottom: 4px; }

.chapter-rail {
  position: fixed; top: 50%; right: clamp(18px, 2.2vw, 42px); z-index: 20;
  display: flex; flex-direction: column; gap: 13px; transform: translateY(-50%);
}
.rail-item {
  position: relative; display: grid; grid-template-columns: 34px 22px; gap: 8px;
  align-items: center; width: 64px; padding: 5px 0; border: 0; cursor: pointer;
  color: #9f999c; background: transparent; text-align: left;
}
.rail-line { width: 13px; height: 1px; justify-self: end; background: #bdb7ba; transition: width .25s, background .25s; }
.rail-number { font: 500 10px/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
.rail-label {
  position: absolute; right: 61px; top: 50%; width: max-content; padding: 7px 10px;
  color: var(--white); background: var(--ink); font-size: 11px; opacity: 0;
  pointer-events: none; transform: translate(6px,-50%); transition: opacity .2s, transform .2s;
}
.rail-item:hover .rail-label, .rail-item:focus-visible .rail-label { opacity: 1; transform: translate(0,-50%); }
.rail-item.is-active { color: var(--red); }
.rail-item.is-active .rail-line { width: 34px; background: var(--red); }

.hero, .case-section { scroll-margin-top: var(--header); }
.hero {
  position: relative; min-height: 100svh; max-width: var(--max); margin: 0 auto;
  padding: clamp(130px, 16vh, 190px) clamp(84px, 8vw, 140px) 72px clamp(36px, 7vw, 116px);
  display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(280px, .7fr); gap: 48px 9vw;
  align-content: start; overflow: hidden;
}
.hero-copy { position: relative; z-index: 2; }
.kicker { display: flex; gap: 24px; margin-bottom: 30px; color: var(--red); font-size: 10px; letter-spacing: .19em; }
.kicker span + span { color: var(--muted); }
h1 { max-width: 800px; margin: 0; font-size: clamp(52px, 6.3vw, 102px); line-height: .98; letter-spacing: -.065em; font-weight: 580; }
.project-definition { align-self: end; max-width: 420px; padding: 0 16px 8px 28px; border-left: 2px solid var(--red); }
.definition-label { color: var(--red); font-size: 11px; letter-spacing: .14em; }
.project-definition p { margin: 18px 0 0; font-size: clamp(18px, 1.5vw, 24px); line-height: 1.65; letter-spacing: -.02em; }

.hero-visual { position: relative; grid-column: 1 / -1; height: clamp(300px, 42vh, 540px); margin-top: 8px; }
.hero-index {
  position: absolute; right: -14px; top: -110px; color: transparent;
  font-size: clamp(180px, 24vw, 380px); font-weight: 700; line-height: 1;
  -webkit-text-stroke: 1px rgba(134,23,42,.12); letter-spacing: -.09em;
}
.hero-evidence {
  position: absolute; left: 4%; right: 4%; top: 8%; bottom: -23%;
  margin: 0; overflow: hidden; border: 1px solid #d8d3d5; background: #f7f7f7;
  box-shadow: 0 28px 70px rgba(39,33,36,.12);
  transform: perspective(1300px) rotateX(1deg);
}
.hero-evidence img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: center top; }
.system-window { overflow: hidden; border: 1px solid #d8d3d5; background: #f7f7f7; box-shadow: 0 28px 70px rgba(39,33,36,.12); }
.hero-window { position: absolute; left: 4%; right: 4%; top: 8%; bottom: -23%; transform: perspective(1300px) rotateX(1deg); }
.window-bar { height: 52px; display: grid; grid-template-columns: 100px 1fr 32px; align-items: center; padding: 0 20px; color: var(--white); background: var(--ink); }
.window-mark { font: 700 12px/1 Georgia, serif; letter-spacing: .12em; }
.window-title { justify-self: center; font-size: 12px; letter-spacing: .05em; }
.window-user { display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid rgba(255,255,255,.45); border-radius: 50%; font-size: 10px; }
.window-body { display: flex; height: calc(100% - 52px); }
.mini-sidebar { width: 205px; flex: none; padding: 28px 20px; color: var(--white); background: linear-gradient(180deg, var(--red), #65101f); }
.sidebar-label { display: block; margin: 0 0 13px; color: rgba(255,255,255,.55); font-size: 8px; letter-spacing: .15em; }
.side-row { display: flex; align-items: center; gap: 10px; margin: 5px 0; padding: 9px 10px; border-radius: 2px; font-size: 11px; }
.side-row i { width: 6px; height: 6px; border: 1px solid currentColor; border-radius: 50%; }
.side-row.is-current { background: rgba(255,255,255,.16); }
.hero-dashboard { flex: 1; padding: 32px clamp(24px, 4vw, 64px); background: #fbfbfb; }
.dashboard-head { display: flex; justify-content: space-between; padding-bottom: 22px; border-bottom: 1px solid #e1dddf; font-size: 16px; }
.muted { color: #9c9699; font-size: 10px; }
.metric-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 26px; }
.metric { min-height: 120px; padding: 22px; background: var(--white); border: 1px solid #e4e0e2; }
.metric.accent { color: var(--white); border-color: var(--red); background: linear-gradient(145deg, #9a2639, var(--red)); }
.metric b { display: block; font: 520 34px/1 Georgia, serif; }
.metric small { display: block; margin-top: 28px; color: inherit; opacity: .68; font-size: 9px; letter-spacing: .08em; text-transform: uppercase; }
.flow-preview { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 14px; align-items: center; margin-top: 24px; padding: 20px; background: var(--white); border: 1px solid #e4e0e2; }
.flow-column { padding-left: 12px; border-left: 2px solid var(--gold); }
.flow-column:nth-of-type(2) { border-color: var(--pink); }
.flow-column:nth-of-type(3) { border-color: var(--green); }
.flow-column span { display: block; color: #999296; font-size: 8px; letter-spacing: .16em; }
.flow-column strong { display: block; margin-top: 7px; font-size: 12px; font-weight: 550; }
.flow-preview > i { color: var(--red); font-style: normal; }
.scroll-cue { position: absolute; left: clamp(36px, 7vw, 116px); bottom: 28px; display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 10px; letter-spacing: .12em; }
.scroll-cue i { display: block; width: 46px; height: 1px; background: var(--red); }

.case-section { max-width: var(--max); min-height: 100svh; margin: 0 auto; padding: 120px clamp(84px, 8vw, 140px) 100px clamp(36px, 7vw, 116px); }
.section-heading { display: flex; align-items: flex-start; gap: 18px; margin-bottom: 42px; }
.section-number { color: var(--red); font: 500 12px/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
.section-heading p { margin: -2px 0 8px; color: var(--muted); font-size: 9px; letter-spacing: .2em; }
.section-heading h2 { margin: 0; font-size: clamp(34px, 4vw, 58px); font-weight: 520; line-height: 1; letter-spacing: -.045em; }
.case-grid { display: grid; grid-template-columns: minmax(0, 4.1fr) minmax(210px, 1.15fr); gap: clamp(32px, 5vw, 76px); align-items: start; }
.evidence-stage { min-width: 0; margin: 0; outline: none; }
.evidence-stage > figcaption { display: flex; justify-content: space-between; align-items: center; height: 40px; padding: 0 2px; border-top: 1px solid var(--ink); font-size: 11px; }
.evidence-stage > figcaption em { color: var(--muted); font-size: 9px; font-style: normal; letter-spacing: .05em; }
.zoomable { cursor: zoom-in; }
.zoomable:focus-visible > figcaption { color: var(--red); }
.evidence-sequence { display: grid; gap: clamp(58px, 7vw, 96px); min-width: 0; }
.result-sequence { gap: clamp(44px, 5vw, 72px); }
.evidence-gallery { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(22px, 2.5vw, 38px); min-width: 0; }
.gallery-card { min-width: 0; margin: 0; }
.gallery-card > figcaption { gap: 14px; }
.gallery-card > figcaption span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.gallery-card > figcaption em { flex: none; }
.image-frame {
  overflow: hidden; border: 1px solid #d9d5d7; background: #f7f7f7;
  box-shadow: 0 20px 48px rgba(39,33,36,.07);
}
.image-frame img { display: block; width: 100%; height: auto; }
.entity-gallery .image-frame { aspect-ratio: 1.13; background: var(--white); }
.entity-gallery .image-frame img { width: 100%; height: 100%; object-fit: contain; object-position: center top; }
.prototype-gallery .image-frame { aspect-ratio: 1.7; }
.prototype-gallery .image-frame img { width: 100%; height: 100%; object-fit: cover; object-position: center top; }
.system-gallery .image-frame { aspect-ratio: 1.56; }
.system-gallery .image-frame img { width: 100%; height: 100%; object-fit: cover; object-position: center top; }
.image-frame-canvas { background: #fbfbfb; }
.image-frame-portrait { background: var(--paper); }
.evidence-detail { width: 58%; margin-left: auto; }
.evidence-detail > figcaption { gap: 18px; }
.evidence-detail > figcaption span { max-width: 54%; }
.note-slot { position: sticky; top: 130px; min-height: 245px; padding-top: 0; }
.note-rule { width: 100%; height: 1px; margin-bottom: 14px; background: #d8d3d5; }
.note-slot > span { color: #aaa4a7; font-size: 10px; letter-spacing: .08em; }
.design-note .note-eyebrow { color: var(--red); font-size: 9px; letter-spacing: .18em; }
.design-note h3 { margin: 28px 0 17px; font-size: clamp(21px, 1.7vw, 28px); font-weight: 540; line-height: 1.28; letter-spacing: -.035em; }
.design-note p { margin: 0; color: #5f585c; font-size: 13px; line-height: 1.9; }
.design-note dl { margin: 34px 0 0; border-top: 1px solid #e3dfe0; }
.design-note dl div { display: grid; grid-template-columns: 60px 1fr; gap: 12px; padding: 15px 0; border-bottom: 1px solid #e3dfe0; }
.design-note dt { color: var(--red); font-size: 10px; letter-spacing: .08em; }
.design-note dd { margin: 0; color: #686165; font-size: 11px; line-height: 1.55; }
.placeholder-lines { margin-top: 46px; }
.placeholder-lines i { display: block; width: 100%; height: 1px; margin-top: 25px; background: linear-gradient(90deg,#ebe8e9 0 72%,transparent 72%); }
.placeholder-lines i:nth-child(2) { background: linear-gradient(90deg,#ebe8e9 0 88%,transparent 88%); }
.placeholder-lines i:nth-child(3) { background: linear-gradient(90deg,#ebe8e9 0 54%,transparent 54%); }

.excel-shell { overflow: hidden; min-height: 550px; color: #454044; border: 1px solid #d9d5d7; background: var(--white); box-shadow: 0 20px 48px rgba(39,33,36,.07); }
.excel-tabs { height: 42px; display: flex; align-items: center; gap: 15px; padding: 0 17px; color: var(--white); background: #217346; font-size: 11px; }
.excel-tabs .excel-app { display: grid; place-items: center; width: 24px; height: 24px; background: rgba(255,255,255,.16); font-weight: 700; }
.excel-tabs i { width: 9px; height: 9px; margin-left: auto; border: 1px solid rgba(255,255,255,.5); }
.excel-tabs i + i { margin-left: 0; }
.excel-ribbon { height: 40px; display: flex; align-items: center; gap: 26px; padding: 0 18px; border-bottom: 1px solid #dedede; font-size: 10px; }
.excel-ribbon b { color: #217346; }
.formula-row { height: 34px; display: grid; grid-template-columns: 60px 35px 1fr; align-items: center; border-bottom: 1px solid #ddd; font-size: 10px; }
.formula-row > * { height: 100%; display: flex; align-items: center; padding: 0 11px; border-right: 1px solid #ddd; }
.formula-row b { color: #777; font: italic 12px Georgia, serif; }
.sheet-grid { display: grid; grid-template-columns: 34px 95px 145px minmax(200px, 1.8fr) 108px 76px 110px; grid-auto-rows: 42px; min-width: 870px; font-size: 9px; }
.corner, .col-head, .row-head { display: grid; place-items: center; color: #696366; background: #f4f4f4; border-right: 1px solid #ddd; border-bottom: 1px solid #ddd; }
.cell { overflow: hidden; padding: 13px 10px; white-space: nowrap; border-right: 1px solid #e4e4e4; border-bottom: 1px solid #e4e4e4; }
.cell.selected { position: relative; outline: 2px solid #217346; outline-offset: -2px; font-weight: 650; }
.cell mark { padding: 3px 6px; color: #217346; background: #e8f3ed; }
.cell.redact span { display: block; width: 78%; height: 7px; margin-top: 4px; background: repeating-linear-gradient(90deg,#d8d5d6 0 22px,transparent 22px 27px); opacity: .66; }
.sheet-tabs { height: 39px; display: flex; align-items: flex-end; gap: 2px; padding-left: 12px; color: #645f62; background: #f4f4f4; border-top: 1px solid #ddd; font-size: 9px; }
.sheet-tabs span, .sheet-tabs b { padding: 11px 14px 9px; font-weight: 450; white-space: nowrap; }
.sheet-tabs b { color: #217346; background: var(--white); border-bottom: 2px solid #217346; }

.canvas-stage { background: #f7f5f2; }
.canvas-stage > figcaption { padding: 0 12px; }
.canvas-board { position: relative; min-height: 590px; overflow: hidden; background-color: #f7f5f2; background-image: radial-gradient(#d2cdca 1px, transparent 1px); background-size: 18px 18px; }
.canvas-lines { position: absolute; inset: 0; width: 100%; height: 100%; }
.canvas-lines path { fill: none; stroke: var(--red); stroke-width: 1.7; marker-end: url(#arrow); }
.canvas-group { position: absolute; padding: 36px 14px 14px; border: 1px solid; border-radius: 5px; }
.canvas-group > label { position: absolute; left: 12px; top: 9px; font-size: 10px; font-weight: 650; line-height: 1.15; }
.canvas-group > label small { color: #776f73; font-size: 7px; font-weight: 450; }
.canvas-node { display: grid; place-items: center; min-height: 50px; margin-top: 9px; padding: 8px 12px; color: var(--ink); border: 1px solid rgba(39,33,36,.22); border-radius: 4px; background: rgba(255,255,255,.94); box-shadow: 0 4px 12px rgba(39,33,36,.06); font-size: 10px; }
.group-opportunity { left: 3%; top: 17%; width: 20%; height: 220px; border-color: var(--gold); background: rgba(243,237,227,.8); }
.group-customer { left: 27%; top: 6%; width: 16%; height: 130px; border-color: var(--pink); background: rgba(245,234,236,.82); }
.group-supplier { left: 27%; bottom: 7%; width: 16%; height: 135px; border-color: var(--green); background: rgba(235,239,234,.84); }
.group-core { left: 38%; top: 31%; width: 19%; height: 210px; border-color: var(--sand); background: rgba(244,236,231,.86); }
.group-settlement { right: 3%; top: 16%; width: 27%; height: 330px; border-color: var(--blue); background: rgba(234,239,242,.85); }
.canvas-legend { position: absolute; left: 4%; bottom: 4%; display: flex; gap: 20px; font-size: 8px; }
.canvas-legend span { display: flex; align-items: center; gap: 7px; }
.canvas-legend i { width: 18px; height: 1px; background: #6e686b; }
.canvas-legend span + span i { background: var(--red); }

.document-stage { background: var(--paper); }
.document-stage > figcaption { padding: 0 12px; }
.document-workspace { position: relative; min-height: 590px; overflow: hidden; display: grid; grid-template-columns: 220px 1fr; gap: 34px; padding: 42px; background: linear-gradient(145deg,#f6f3f0,#ebe7e4); }
.doc-tree { display: flex; flex-direction: column; gap: 5px; padding: 22px 16px; color: #5c5559; border: 1px solid #d7d0cd; background: rgba(255,255,255,.56); font-size: 9px; }
.doc-tree b { margin-bottom: 15px; color: var(--ink); font-size: 11px; }
.doc-tree span { padding: 7px 9px; }
.doc-tree .tree-current { color: var(--red); background: var(--red-soft); font-weight: 650; }
.paper { position: absolute; width: min(55%, 520px); min-height: 465px; padding: 42px; background: var(--white); box-shadow: 0 20px 45px rgba(39,33,36,.12); }
.paper-back { right: 5%; top: 64px; transform: rotate(3deg); opacity: .52; }
.paper-front { right: 10%; top: 30px; }
.paper h3 { margin: 12px 0 7px; font: 580 25px/1.1 Georgia, serif; }
.paper p { color: var(--muted); font-size: 10px; }
.paper-meta { display: flex; justify-content: space-between; color: var(--red); font-size: 10px; letter-spacing: .1em; }
.paper-meta em { color: var(--muted); font-size: 8px; font-style: normal; }
.review-stats { display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; margin: 30px 0 24px; }
.review-stats div { padding: 13px 10px; background: #f7f4f3; }
.review-stats b { display: block; font: 520 20px/1 Georgia, serif; }
.review-stats span { display: block; margin-top: 8px; color: var(--muted); font-size: 8px; }
.issue-row { display: grid; grid-template-columns: 52px 1fr 13px; align-items: center; gap: 10px; margin: 9px 0; padding: 12px; border: 1px solid #e3dfe0; font-size: 8px; }
.issue-row b { font-size: 7px; }
.issue-row i { width: 7px; height: 7px; border-radius: 50%; }
.issue-row.high i { background: var(--red); }.issue-row.medium i { background: var(--gold); }.issue-row.low i { background: var(--blue); }
.paper-line { width: 67%; height: 5px; margin: 20px 0; background: #ddd7d9; }.paper-line.long { width: 92%; }
.paper-table { height: 230px; margin-top: 40px; background: repeating-linear-gradient(0deg,#ece9ea 0 1px,transparent 1px 28px), repeating-linear-gradient(90deg,#ece9ea 0 1px,transparent 1px 94px); }

.product-stage > figcaption { padding: 0 2px; }
.product-window { height: 590px; }
.product-sidebar { width: 188px; flex: none; padding: 25px 15px; color: var(--white); background: var(--red); }
.product-sidebar .sidebar-label { margin-top: 13px; }
.product-sidebar b, .product-sidebar > span:not(.sidebar-label) { display: block; padding: 9px 11px; font-size: 9px; font-weight: 450; }
.product-sidebar b.is-current { background: rgba(255,255,255,.18); font-weight: 650; }
.product-main { min-width: 0; flex: 1; background: #f7f7f7; }
.product-toolbar { height: 66px; display: flex; align-items: center; gap: 8px; padding: 0 22px; background: var(--white); border-bottom: 1px solid #ddd; }
.product-toolbar h3 { margin: 0 12px 0 0; font-size: 16px; font-weight: 550; }
.product-toolbar button, .filter-row button { height: 30px; padding: 0 13px; color: var(--white); border: 1px solid var(--red); border-radius: 2px; background: var(--red); font-size: 9px; }
.product-toolbar button.ghost { color: #5e585b; border-color: #d9d5d7; background: var(--white); }
.product-toolbar span { flex: 1; }.product-toolbar a { color: var(--red); font-size: 9px; }
.filter-row { display: grid; grid-template-columns: 1.4fr 1fr 1fr auto; gap: 10px; padding: 18px 22px; background: var(--white); border-bottom: 1px solid #ddd; }
.filter-row label { display: flex; align-items: center; gap: 8px; color: #777074; font-size: 8px; }
.filter-row i { flex: 1; height: 30px; padding: 9px; color: #aaa; border: 1px solid #ddd; border-radius: 2px; font-style: normal; }
.data-table { margin: 16px; background: var(--white); border: 1px solid #e0ddde; }
.data-row { display: grid; grid-template-columns: .9fr 1.6fr .6fr 1fr .7fr .5fr; min-width: 610px; border-bottom: 1px solid #e4e1e2; }
.data-row span { min-width: 0; overflow: hidden; padding: 17px 12px; text-overflow: ellipsis; white-space: nowrap; font-size: 9px; }
.data-head { color: #6d676a; background: #f6f5f5; font-weight: 650; }
.tag { padding: 4px 6px; border-radius: 2px; font-size: 7px; font-style: normal; }.tag.green { color: #4d7047; background: #eaf2e7; }.tag.blue { color: #47718b; background: #e6f0f5; }.tag.gray { color: #6f676b; background: #edeaeb; }

.prototype-footer { display: flex; justify-content: space-between; margin-top: 100px; padding-top: 20px; border-top: 1px solid var(--ink); color: var(--muted); font-size: 9px; letter-spacing: .13em; }
.prototype-footer a { color: var(--red); }

.lightbox { width: min(94vw, 1500px); max-height: 92vh; padding: 48px 28px 28px; border: 0; background: var(--white); box-shadow: 0 30px 100px rgba(0,0,0,.28); }
.lightbox::backdrop { background: rgba(39,33,36,.72); backdrop-filter: blur(8px); }
.lightbox-close { position: absolute; right: 18px; top: 10px; padding: 4px 10px; color: var(--ink); border: 0; background: transparent; cursor: pointer; font-size: 28px; font-weight: 250; }
.lightbox-content { max-height: calc(92vh - 78px); overflow: auto; }
.lightbox-content > * { margin: 0; }
.lightbox-content > img, .lightbox-content .image-frame img { display: block; width: 100%; height: auto; }
.lightbox-content .image-frame { border: 0; box-shadow: none; }
.lightbox-content .excel-shell, .lightbox-content .canvas-board, .lightbox-content .document-workspace, .lightbox-content .product-window { min-height: 720px; height: 76vh; }

@media (max-width: 1080px) {
  .hero { grid-template-columns: 1fr; padding-right: 88px; }
  .project-definition { align-self: start; max-width: 650px; }
  .hero-visual { margin-top: 0; }
  .case-section { padding-right: 88px; }
  .case-grid { grid-template-columns: minmax(0, 1fr) 190px; gap: 30px; }
  .document-workspace { grid-template-columns: 160px 1fr; padding: 28px; }
}

@media (max-width: 760px) {
  :root { --header: 60px; }
  .site-header { grid-template-columns: 1fr auto; padding: 0 20px; }
  .header-center { display: none; }
  .chapter-rail { top: auto; left: 0; right: 0; bottom: 0; transform: none; flex-direction: row; justify-content: center; gap: 5px; padding: 8px 12px; background: rgba(255,255,255,.94); border-top: 1px solid #e4e0e2; backdrop-filter: blur(12px); }
  .rail-item { grid-template-columns: 18px; width: 43px; justify-content: center; }
  .rail-line { display: none; }.rail-number { text-align: center; }.rail-item.is-active .rail-number { border-bottom: 2px solid var(--red); padding-bottom: 4px; }
  .rail-label { display: none; }
  .hero { min-height: auto; padding: 112px 22px 90px; gap: 34px; }
  h1 { font-size: clamp(48px, 15vw, 72px); }
  .project-definition { padding-left: 18px; }
  .project-definition p { font-size: 18px; }
  .hero-visual { height: 360px; margin-top: 12px; overflow: hidden; }
  .hero-window { left: 0; right: auto; width: 760px; top: 20px; bottom: 0; transform: scale(.62); transform-origin: left top; }
  .hero-evidence { left: 0; right: 0; top: 20px; bottom: 0; transform: none; }
  .hero-evidence img { object-position: center top; }
  .hero-index { right: -15px; top: -45px; font-size: 180px; }
  .scroll-cue { display: none; }
  .case-section { min-height: auto; padding: 88px 22px 90px; }
  .section-heading { margin-bottom: 28px; }
  .case-grid { grid-template-columns: 1fr; gap: 28px; }
  .note-slot { position: static; min-height: 150px; }
  .design-note h3 { max-width: 520px; }
  .evidence-detail { width: 100%; margin-left: 0; }
  .evidence-gallery { grid-template-columns: 1fr; }
  .entity-gallery .image-frame { aspect-ratio: auto; }
  .entity-gallery .image-frame img { height: auto; }
  .placeholder-lines { margin-top: 28px; }
  .evidence-stage { overflow-x: auto; }
  .image-stage { overflow: visible; }
  .image-frame { width: 100%; }
  .excel-shell, .canvas-board, .document-workspace, .product-window { min-width: 760px; min-height: 500px; }
  .evidence-stage > figcaption { position: sticky; left: 0; width: calc(100vw - 44px); }
  .document-workspace { grid-template-columns: 180px 1fr; }
  .prototype-footer { margin-bottom: 48px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}