:root {
  color-scheme: light;
  --navy-900: #071b4d;
  --navy-800: #0d2766;
  --navy-700: #1a3a85;
  --blue-600: #2a78d6;
  --blue-100: #e6effb;
  --blue-50: #f3f7fd;
  --ink: #0f1830;
  --ink-2: #3d4660;
  --ink-3: #6a7289;
  --line: #dfe3ec;
  --line-2: #eceff5;
  --surface: #ffffff;
  --bg: #f7f8fb;
  --neg: #d4581f;
  --fact: #0d6b4f;       --fact-bg: #e3f4ec;
  --assump: #8a5a00;     --assump-bg: #fdf1d8;
  --prop: #1a3a85;       --prop-bg: #e6effb;
  --illus: #7a2e8c;      --illus-bg: #f5e6f8;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --toc-w: 232px;
  --top-h: 56px;
  --radius: 10px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--top-h) + 16px); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; font-family: var(--sans); color: var(--ink); background: var(--bg); font-size: 16px; line-height: 1.55; -webkit-font-smoothing: antialiased; }
h1, h2, h3 { line-height: 1.2; margin: 0; }
p { margin: 0 0 .75em; }
ul, ol { margin: 0; padding-left: 1.2em; }
small { color: var(--ink-3); font-weight: 400; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -9999px; top: 8px; background: var(--navy-900); color: #fff; padding: 8px 12px; border-radius: 6px; z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--blue-600); outline-offset: 2px; }

/* Top bar */
.topbar { position: fixed; inset: 0 0 auto 0; height: var(--top-h); background: var(--navy-900); color: #fff; display: flex; align-items: center; gap: 12px; padding: 0 16px; z-index: 40; }
.topbar-title { font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; flex: 1; min-width: 0; }
.topbar-title span { color: #b8c4e3; }
.progress { position: absolute; left: 0; right: 0; bottom: 0; height: 3px; background: rgba(255,255,255,.08); }
.progress span { display: block; height: 100%; width: 0; background: #6fa8ff; transition: width .15s linear; }
.menu-btn, .icon-btn { background: transparent; border: 0; color: inherit; padding: 6px; border-radius: 6px; cursor: pointer; display: inline-flex; }
.menu-btn { display: none; }
.ask-btn { display: inline-flex; align-items: center; gap: 8px; background: #fff; color: var(--navy-900); border: 0; border-radius: 999px; padding: 8px 14px; font: 600 14px var(--sans); cursor: pointer; white-space: nowrap; }
.ask-btn:hover { background: var(--blue-100); }

/* TOC */
.toc { position: fixed; top: var(--top-h); left: 0; bottom: 0; width: var(--toc-w); background: var(--surface); border-right: 1px solid var(--line); overflow-y: auto; padding: 20px 14px; z-index: 30; }
.toc ol { list-style: none; padding: 0; margin: 0 0 20px; counter-reset: toc; }
.toc li a { display: block; padding: 6px 10px; border-radius: 6px; color: var(--ink-2); text-decoration: none; font-size: 14px; }
.toc li a:hover { background: var(--bg); color: var(--ink); }
.toc li a.active { background: var(--blue-100); color: var(--navy-900); font-weight: 600; }
.legend-box { border-top: 1px solid var(--line); padding-top: 14px; }
.legend-title { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); margin-bottom: 8px; }
.labels-key { list-style: none; padding: 0; font-size: 13px; color: var(--ink-2); display: grid; gap: 6px; }

/* Tags */
.tag { display: inline-block; font: 600 11px/1 var(--sans); letter-spacing: .04em; text-transform: uppercase; padding: 4px 7px; border-radius: 4px; vertical-align: middle; white-space: nowrap; }
.tag.fact { color: var(--fact); background: var(--fact-bg); }
.tag.assumption { color: var(--assump); background: var(--assump-bg); }
.tag.proposed { color: var(--prop); background: var(--prop-bg); }
.tag.illustrative { color: var(--illus); background: var(--illus-bg); }

/* Main + sections */
main { margin-left: var(--toc-w); padding-top: var(--top-h); }
section { padding: 64px clamp(16px, 5vw, 72px); border-bottom: 1px solid var(--line); background: var(--surface); }
section > * { max-width: 1200px; }
section:nth-of-type(even) { background: var(--bg); }
.eyebrow { font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--blue-600); margin-bottom: 10px; }
h1 { font-family: var(--serif); font-weight: 600; font-size: clamp(36px, 5vw, 60px); color: var(--navy-900); letter-spacing: -.01em; margin-bottom: 20px; }
h1 em { font-style: normal; color: var(--blue-600); }
h2 { font-family: var(--serif); font-weight: 600; font-size: clamp(26px, 3vw, 36px); color: var(--navy-900); margin-bottom: 28px; max-width: 36ch; }
h3 { font-size: 17px; font-weight: 600; color: var(--navy-900); margin-bottom: 8px; }
.lede { font-size: clamp(18px, 1.6vw, 21px); color: var(--ink-2); max-width: 62ch; line-height: 1.5; }
.note { font-size: 14px; color: var(--ink-3); max-width: 80ch; margin-top: 12px; }
.kicker { margin-top: 24px; padding: 14px 18px; border-left: 3px solid var(--blue-600); background: var(--blue-50); border-radius: 0 8px 8px 0; color: var(--ink-2); max-width: 90ch; }

/* Hero */
.hero { padding-top: 72px; }
.hero-facts { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; margin: 36px 0; max-width: 980px; }
.stat { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; display: flex; flex-direction: column; gap: 8px; align-items: flex-start; }
.stat-v { font-size: 30px; font-weight: 700; color: var(--navy-900); letter-spacing: -.01em; }
.stat-l { font-size: 14px; color: var(--ink-2); }
.storyline { max-width: 980px; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 22px; }
.storyline-title { font-weight: 600; color: var(--navy-900); }
.storyline ol { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 6px 28px; font-size: 15px; color: var(--ink-2); }

/* Quote + compare */
.quote-block { max-width: 900px; margin-bottom: 28px; }
blockquote { margin: 0 0 8px; font-family: var(--serif); font-size: 21px; line-height: 1.45; color: var(--ink); border-left: 3px solid var(--navy-900); padding-left: 18px; }
cite { font-style: normal; font-size: 14px; color: var(--ink-3); padding-left: 21px; }
.compare { display: grid; grid-template-columns: 1fr auto 1fr; gap: 18px; align-items: stretch; max-width: 1000px; }
.compare-col { border-radius: var(--radius); padding: 20px 22px; border: 1px solid var(--line); background: var(--surface); }
.compare-col.to { border-color: var(--navy-700); box-shadow: inset 0 3px 0 var(--navy-700); }
.compare-col ul { margin-bottom: 12px; color: var(--ink-2); display: grid; gap: 6px; }
.compare-arrow { align-self: center; font-size: 28px; color: var(--blue-600); }

/* Cards */
.cards { display: grid; gap: 16px; }
.cards.four { grid-template-columns: repeat(4, minmax(0,1fr)); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.card p { color: var(--ink-2); font-size: 15px; }

/* Two / three col */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; max-width: 1100px; }
.two-col.tight .kicker { margin-top: 16px; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.panel.muted { background: var(--bg); border-style: dashed; }
.panel h3 { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 14px; }
ul.check, ul.pending { list-style: none; padding: 0; display: grid; gap: 8px; color: var(--ink-2); font-size: 15px; }
ul.check li::before { content: "✓"; color: var(--fact); font-weight: 700; margin-right: 10px; }
ul.pending li::before { content: "○"; color: var(--ink-3); margin-right: 10px; }

/* Tree */
.tree { display: grid; grid-template-columns: 260px 1fr; gap: 24px; align-items: center; }
.tree-root { background: var(--navy-900); color: #fff; border-radius: var(--radius); padding: 22px; }
.tree-root span { display: block; font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: #9fb3e6; margin-bottom: 6px; }
.tree-root strong { font-family: var(--serif); font-size: 20px; font-weight: 600; line-height: 1.3; }
.tree-branches { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 12px; position: relative; }
.branch { background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--blue-600); border-radius: 8px; padding: 12px 14px; }
.branch b { color: var(--navy-900); }
.branch p { font-size: 14px; color: var(--ink-2); margin: 4px 0 6px; }
.branch small { font-size: 12.5px; }

/* Behaviours */
.behaviours { display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); gap: 12px; margin-bottom: 28px; }
.beh { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.beh.accent { background: var(--navy-900); border-color: var(--navy-900); }
.beh.accent h3, .beh.accent p { color: #fff; }
.beh.accent .beh-n { background: #fff; color: var(--navy-900); }
.beh-n { display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: var(--navy-900); color: #fff; font-weight: 700; font-size: 13px; margin-bottom: 10px; }
.beh p { font-size: 14.5px; color: var(--ink-2); margin: 0; }
.rules { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.rules h3 { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 14px; }
.rules-grid { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 18px; }
.rules-grid p { font-size: 14px; color: var(--ink-2); margin: 4px 0 0; }

/* Operating model */
.model-wrap { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 24px; align-items: start; }
.stack { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; position: relative; }
.layer { border-radius: 8px; padding: 12px 16px; display: grid; grid-template-columns: 220px 1fr; gap: 12px; align-items: center; border: 1px solid var(--line); background: var(--surface); position: relative; }
.layer b { color: var(--navy-900); font-size: 15px; }
.layer span { font-size: 13.5px; color: var(--ink-2); }
.l-cust { background: var(--bg); }
.l-dig { border-left: 4px solid #9cc0ef; }
.l-va { border-left: 4px solid #6fa0e6; }
.l-l1 { background: var(--navy-900); border-color: var(--navy-900); }
.l-l1 b, .l-l1 span { color: #fff; }
.l-sr { border-left: 4px solid var(--navy-700); }
.l-res { border-left: 4px solid #8a93a8; }
.l-eng { border-left: 4px solid #b7bdcb; }
.model-side { display: grid; gap: 12px; }
.side-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.side-card.own { border-color: var(--navy-900); box-shadow: inset 4px 0 0 var(--navy-900); }
.side-card p { font-size: 14.5px; color: var(--ink-2); margin: 0; }

/* Tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.grid-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.grid-table th { text-align: left; font-size: 12.5px; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-3); background: var(--bg); padding: 12px 14px; border-bottom: 1px solid var(--line); }
.grid-table td { padding: 13px 14px; border-bottom: 1px solid var(--line-2); vertical-align: top; color: var(--ink-2); }
.grid-table tr:last-child td { border-bottom: 0; }
.grid-table td b { color: var(--navy-900); }
.grid-table.compact td { padding: 10px 12px; font-size: 14px; }
.pill { display: inline-block; font-size: 12px; font-weight: 600; padding: 3px 8px; border-radius: 999px; margin: 2px 0; white-space: nowrap; }
.pill.h1 { background: var(--navy-900); color: #fff; }
.pill.h2 { background: var(--blue-100); color: var(--navy-800); }
.pill.h3 { background: var(--line-2); color: var(--ink-2); }

/* Ladder + guardrails */
.ladder { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 12px; margin-bottom: 24px; align-items: end; }
.rung { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.rung:nth-child(1) { min-height: 150px; }
.rung:nth-child(2) { min-height: 175px; border-color: var(--blue-600); }
.rung:nth-child(3) { min-height: 200px; border-color: var(--navy-900); box-shadow: inset 0 3px 0 var(--navy-900); }
.rung-n { font-size: 12px; font-weight: 700; color: var(--blue-600); }
.rung p { font-size: 14.5px; color: var(--ink-2); margin: 0; }
.three-col { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 14px; }
.g-col { border-radius: var(--radius); padding: 18px 20px; border: 1px solid var(--line); background: var(--surface); }
.g-col ul { display: grid; gap: 6px; font-size: 14.5px; color: var(--ink-2); }
.g-col.can { border-top: 4px solid var(--fact); }
.g-col.human { border-top: 4px solid var(--navy-900); }
.g-col.never { border-top: 4px solid var(--neg); }

/* Roadmap */
.horizons { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.hz.h1 { grid-column: 1 / -1; }
.hz { border-radius: var(--radius); padding: 20px; background: var(--surface); border: 1px solid var(--line); }
.hz.h1 { border-top: 4px solid var(--navy-900); }
.hz.h2 { border-top: 4px solid var(--blue-600); }
.hz.h3 { border-top: 4px solid #8fb5ec; }
.hz-when { font-size: 12.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--blue-600); margin-bottom: 4px; }
.hz h3 { margin-bottom: 14px; }
.hz > ul { display: grid; gap: 7px; font-size: 14.5px; color: var(--ink-2); }
.sprints { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 10px; margin-bottom: 14px; }
.sprint { background: var(--bg); border-radius: 8px; padding: 12px; }
.sprint b { display: block; font-size: 13.5px; color: var(--navy-900); margin-bottom: 6px; }
.sprint ul { font-size: 13.5px; color: var(--ink-2); display: grid; gap: 5px; padding-left: 1.05em; }
.gate { margin-top: 16px; background: var(--navy-900); color: #fff; border-radius: var(--radius); padding: 14px 18px; font-size: 15px; }

/* KPIs */
.kpi-grid { display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); gap: 12px; margin: 18px 0 24px; }
.kpi { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; display: flex; flex-direction: column; gap: 6px; min-height: 150px; }
.kpi-cat { font-size: 11px; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; color: var(--ink-3); }
.kpi-name { font-weight: 600; color: var(--navy-900); font-size: 15px; line-height: 1.3; }
.kpi-dir { font-size: 13px; color: var(--blue-600); font-weight: 600; }
.kpi-base { margin-top: auto; font-size: 12.5px; color: var(--ink-3); border-top: 1px dashed var(--line); padding-top: 6px; }
.kpi-counter { font-size: 12.5px; color: var(--ink-2); }
.chain { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.chain-step { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; font-size: 14px; color: var(--ink-2); flex: 1 1 150px; }
.chain-step.strong { background: var(--navy-900); color: #fff; border-color: var(--navy-900); font-weight: 600; }
.chain-arrow { color: var(--blue-600); font-weight: 700; }

/* Calculator */
.banner-illustrative { background: var(--illus-bg); color: #4d1d59; border-radius: 8px; padding: 12px 16px; font-size: 14.5px; margin-bottom: 18px; max-width: 1100px; }
.calc { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: 20px; align-items: start; }
.calc-inputs { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.calc-inputs fieldset { border: 0; padding: 0; margin: 0; display: grid; gap: 8px; align-content: start; }
.calc-inputs legend { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--blue-600); margin-bottom: 4px; }
.calc-inputs label { display: grid; grid-template-columns: 1fr 88px; gap: 8px; align-items: center; font-size: 13px; color: var(--ink-2); line-height: 1.3; }
.calc-inputs label small { font-size: 11.5px; }
.calc-inputs input { width: 100%; font: 500 14px var(--sans); padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--ink); text-align: right; }
.calc-inputs input:focus { background: #fff; border-color: var(--blue-600); outline: none; box-shadow: 0 0 0 3px var(--blue-100); }
.btn-ghost { grid-column: 1 / -1; justify-self: start; background: transparent; border: 1px solid var(--line); border-radius: 6px; padding: 7px 12px; font: 500 13px var(--sans); color: var(--ink-2); cursor: pointer; }
.btn-ghost:hover { background: var(--bg); }
.calc-out { display: grid; gap: 14px; }
.calc-head { background: var(--navy-900); color: #fff; border-radius: var(--radius); padding: 16px 18px; }
.stat-inline { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 14px; }
.stat-inline .stat-l { color: #b8c4e3; font-size: 14px; width: 100%; }
.stat-inline .stat-v { font-size: 32px; font-weight: 700; color: #fff; }
.stat-inline .stat-sub { color: #dbe4f7; font-size: 14px; }
.chart { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.chart figcaption { font-weight: 600; color: var(--navy-900); font-size: 14.5px; margin-bottom: 8px; }
.chart-body { position: relative; }
.chart-body svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart-body text { font-family: var(--sans); }
.viz-tip { position: absolute; pointer-events: none; background: var(--ink); color: #fff; font-size: 12.5px; padding: 6px 9px; border-radius: 6px; white-space: nowrap; transform: translate(-50%, -110%); opacity: 0; transition: opacity .1s; z-index: 5; }
.formula { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 16px; font-size: 14px; }
.formula summary { cursor: pointer; font-weight: 600; color: var(--navy-900); }
.formulas { color: var(--ink-2); margin-top: 10px; display: grid; gap: 4px; }
.formula table { width: 100%; border-collapse: collapse; margin-top: 10px; font-variant-numeric: tabular-nums; }
.formula td, .formula th { padding: 6px 8px; border-bottom: 1px solid var(--line-2); text-align: right; }
.formula td:first-child, .formula th:first-child { text-align: left; }

/* Risks */
.risk-layout { display: grid; grid-template-columns: 340px 1fr; gap: 20px; align-items: start; }
.heat { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.heat figcaption { font-weight: 600; color: var(--navy-900); font-size: 14.5px; margin-bottom: 10px; }
.heat-grid { display: grid; grid-template-columns: 26px repeat(3, 1fr); grid-auto-rows: minmax(74px, auto); gap: 3px; }
.heat-grid .ax { font-size: 11px; color: var(--ink-3); display: grid; place-items: center; }
.heat-grid .ax.y { writing-mode: vertical-rl; transform: rotate(180deg); }
.heat-grid .ax.x { grid-row: auto; min-height: 20px; }
.cell { border-radius: 6px; padding: 6px; display: flex; flex-wrap: wrap; gap: 4px; align-content: flex-start; }
.cell[data-s="1"] { background: #eef3fb; }
.cell[data-s="2"] { background: #d6e3f7; }
.cell[data-s="3"] { background: #adc8ef; }
.cell[data-s="4"] { background: #6f9fe0; }
.cell[data-s="5"] { background: #2a5fb5; }
.rchip { font: 600 11.5px var(--sans); background: #fff; color: var(--navy-900); border-radius: 4px; padding: 3px 5px; cursor: default; border: 1px solid rgba(7,27,77,.15); }
.heat-axes { text-align: right; font-size: 11px; color: var(--ink-3); margin-top: 4px; }

/* Trade-offs */
.tradeoffs { counter-reset: t; list-style: none; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; max-width: 1100px; }
.tradeoffs li { counter-increment: t; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px 14px 52px; position: relative; color: var(--ink-2); font-size: 15px; }
.tradeoffs li::before { content: counter(t); position: absolute; left: 16px; top: 14px; width: 24px; height: 24px; border-radius: 50%; background: var(--navy-900); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 12.5px; }
.tradeoffs b { color: var(--navy-900); }

/* Closing */
.closing { background: var(--navy-900) !important; color: #fff; }
.closing .eyebrow { color: #8fb5ec; }
.closing h2 { color: #fff; max-width: 26ch; }
.closing .lede { color: #d6def2; max-width: 70ch; }
.closing .lede strong { color: #fff; }
.asks { display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); gap: 10px; margin: 32px 0; max-width: 1100px; }
.asks div { border: 1px solid rgba(255,255,255,.2); border-radius: 8px; padding: 14px; }
.asks b { font-size: 17px; }
.asks p { font-size: 14px; color: #b8c4e3; margin: 4px 0 0; }
.sign { color: #8fb5ec; font-size: 14px; }

/* Drawer */
.drawer { position: fixed; top: var(--top-h); right: 0; bottom: 0; width: min(460px, 100vw); background: var(--surface); border-left: 1px solid var(--line); box-shadow: -12px 0 32px rgba(7,27,77,.12); display: flex; flex-direction: column; transform: translateX(105%); transition: transform .2s ease; z-index: 50; }
.drawer.open { transform: none; }
.drawer-head { display: flex; gap: 12px; align-items: flex-start; padding: 16px 18px; border-bottom: 1px solid var(--line); }
.drawer-head h2 { font-size: 19px; margin: 0 0 6px; max-width: none; }
.drawer-head p { font-size: 13px; color: var(--ink-3); margin: 0; }
.drawer-head .icon-btn { color: var(--ink-2); margin-left: auto; }
.drawer-body { flex: 1; overflow-y: auto; padding: 16px 18px; display: flex; flex-direction: column; gap: 14px; }
.empty p { font-size: 14px; color: var(--ink-3); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { background: var(--bg); border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; font: 500 13px var(--sans); color: var(--ink-2); cursor: pointer; text-align: left; }
.chip:hover { border-color: var(--blue-600); color: var(--navy-900); }
.msg { font-size: 14.5px; line-height: 1.55; }
.msg.q { align-self: flex-end; background: var(--navy-900); color: #fff; padding: 9px 13px; border-radius: 12px 12px 2px 12px; max-width: 90%; }
.msg.a { background: var(--bg); border: 1px solid var(--line); padding: 12px 14px; border-radius: 2px 12px 12px 12px; color: var(--ink); }
.msg.a p { margin: 0 0 8px; }
.msg.a p:last-child { margin-bottom: 0; }
.msg.a ul { margin: 0 0 8px; display: grid; gap: 4px; }
.msg-meta { font-size: 11.5px; color: var(--ink-3); margin-top: 8px; display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.msg-meta .src { background: var(--line-2); border-radius: 4px; padding: 2px 6px; }
.msg-meta .src.offline { background: var(--assump-bg); color: var(--assump); }
.msg.err { background: #fdecea; border-color: #f3c3bd; }
.typing { display: inline-flex; gap: 4px; padding: 12px 14px; background: var(--bg); border: 1px solid var(--line); border-radius: 12px; align-self: flex-start; }
.typing i { width: 6px; height: 6px; border-radius: 50%; background: var(--ink-3); animation: blink 1.2s infinite; }
.typing i:nth-child(2) { animation-delay: .2s; } .typing i:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%, 80%, 100% { opacity: .25; } 40% { opacity: 1; } }
.drawer-form { border-top: 1px solid var(--line); padding: 12px 18px 16px; display: grid; gap: 8px; }
.drawer-form textarea { width: 100%; resize: none; font: 14.5px/1.45 var(--sans); padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); }
.drawer-form textarea:focus { outline: none; border-color: var(--blue-600); box-shadow: 0 0 0 3px var(--blue-100); }
.form-row { display: flex; align-items: center; gap: 10px; }
.status { font-size: 12.5px; color: var(--ink-3); flex: 1; }
.btn-primary { background: var(--navy-900); color: #fff; border: 0; border-radius: 8px; padding: 9px 18px; font: 600 14px var(--sans); cursor: pointer; }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }
.scrim { position: fixed; inset: 0; background: rgba(7,27,77,.25); z-index: 45; }

/* Responsive */
@media (max-width: 1200px) {
  .kpi-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .horizons { grid-template-columns: 1fr 1fr; }
  .hz.h1 { grid-column: 1 / -1; }
  .behaviours { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .calc { grid-template-columns: 1fr; }
}
@media (max-width: 1024px) {
  :root { --toc-w: 0px; }
  .menu-btn { display: inline-flex; }
  .toc { width: 260px; transform: translateX(-100%); transition: transform .2s ease; box-shadow: 12px 0 32px rgba(7,27,77,.12); }
  .toc.open { transform: none; }
  .cards.four { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .rules-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .model-wrap, .tree, .risk-layout { grid-template-columns: 1fr; }
  .asks { grid-template-columns: repeat(3, minmax(0,1fr)); }
}
@media (max-width: 720px) {
  body { font-size: 15px; }
  section { padding: 44px 16px; }
  .topbar-title span { display: none; }
  .ask-btn { padding: 7px 11px; font-size: 13px; }
  .hero-facts, .cards.four, .two-col, .three-col, .ladder, .rules-grid, .horizons, .sprints, .tradeoffs, .calc-inputs, .behaviours { grid-template-columns: 1fr; }
  .storyline ol { grid-template-columns: 1fr; }
  .compare { grid-template-columns: 1fr; }
  .compare-arrow { transform: rotate(90deg); justify-self: center; }
  .kpi-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .layer { grid-template-columns: 1fr; gap: 2px; }
  .asks { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .rung { min-height: 0 !important; }
  .chain-arrow { transform: rotate(90deg); width: 100%; text-align: center; }
  .chain-step { flex-basis: 100%; }
  .grid-table thead { display: none; }
  .grid-table, .grid-table tbody, .grid-table tr, .grid-table td { display: block; width: 100%; }
  .grid-table tr { border-bottom: 1px solid var(--line); padding: 8px 0; }
  .grid-table tr:last-child { border-bottom: 0; }
  .grid-table td { border: 0; padding: 4px 14px; }
  .grid-table td:first-child { font-weight: 600; color: var(--navy-900); }
}
@media (max-width: 420px) {
  .kpi-grid { grid-template-columns: 1fr; }
  .ask-btn .lbl-long { display: none; }
}
@media print {
  .topbar, .toc, .drawer, .scrim { display: none !important; }
  main { margin: 0; padding: 0; }
  section { break-inside: avoid-page; }
}

/* Added: theme matrix + five cards */
.matrix-wrap { margin-bottom: 18px; }
.matrix td { font-size: 14px; }
.matrix td:first-child { width: 22%; }
.cards.five { grid-template-columns: repeat(5, minmax(0,1fr)); }
@media (max-width: 1200px) { .cards.five { grid-template-columns: repeat(3, minmax(0,1fr)); } }
@media (max-width: 720px) { .cards.five { grid-template-columns: 1fr; } .matrix td:first-child { width: auto; } }