/* PAIL business experience v4: distinct page systems, one shared product identity. */
:root {
  --v4-ink: #14211d;
  --v4-deep: #0d1b17;
  --v4-green: #1d6b59;
  --v4-teal: #91e4e7;
  --v4-teal-soft: #d9f7f5;
  --v4-yellow: #f6cc5d;
  --v4-yellow-soft: #fff0b9;
  --v4-cream: #fffaf0;
  --v4-paper: #fffef9;
  --v4-sand: #f3ead8;
  --v4-line: #d9cfbc;
  --v4-muted: #65706b;
  --v4-red: #bc5845;
  --v4-blue: #2e6077;
  --v4-shadow: 0 24px 70px rgba(45, 35, 17, .12);
}

.site-v4 {
  color-scheme: light;
  color: var(--v4-ink);
  background: var(--v4-cream);
}

.site-v4 .skip-link {
  position: fixed;
  left: 16px;
  top: -90px;
  z-index: 1000;
  padding: 11px 15px;
  color: white;
  background: var(--v4-deep);
  border: 2px solid var(--v4-yellow);
  font-weight: 800;
}

.site-v4 .skip-link:focus { top: 16px; }
.site-v4 .topbar { border-bottom: 1px solid var(--v4-line); }
.v4-main { overflow: hidden; }
.v4-container { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.v4-kicker {
  display: block;
  color: var(--v4-green);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.v4-section { padding: 92px 0; border-bottom: 1px solid var(--v4-line); }
.v4-section.sand { background: var(--v4-sand); }
.v4-section.dark { color: white; background: var(--v4-deep); border-color: rgba(255,255,255,.12); }
.v4-section-head {
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(320px, 1.05fr);
  gap: 70px;
  align-items: end;
  margin-bottom: 44px;
}
.v4-section-head h2 {
  max-width: 740px;
  margin: 10px 0 0;
  color: inherit;
  font: 400 clamp(2.9rem, 5vw, 5rem)/.96 var(--serif);
  letter-spacing: -.025em;
}
.v4-section-head p { margin: 0; color: var(--v4-muted); font-size: 17px; line-height: 1.7; }
.v4-section.dark .v4-section-head p { color: #aabbb4; }
.v4-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.v4-button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 19px;
  border: 1px solid var(--v4-ink);
  font-weight: 800;
}
.v4-button.primary { color: white; background: var(--v4-ink); }
.v4-button.primary:hover { background: var(--v4-green); }
.v4-button.secondary { background: rgba(255,255,255,.28); }
.v4-button.light { color: var(--v4-ink); background: var(--v4-yellow); border-color: var(--v4-yellow); }

/* Home: executive story plus one interactive proof. */
.home-v4-hero {
  min-height: 720px;
  display: grid;
  align-items: center;
  padding: 70px 0;
  background:
    radial-gradient(circle at 86% 75%, rgba(246, 204, 93, .85), transparent 28%),
    linear-gradient(125deg, #8de3e7 0%, #c9f2ef 64%, #f7e5a7 100%);
}
.home-v4-grid { display: grid; grid-template-columns: .94fr 1.06fr; gap: 76px; align-items: center; }
.home-v4-copy h1 {
  max-width: 670px;
  margin: 18px 0 24px;
  color: #10211c;
  font: 700 clamp(4.2rem, 7vw, 7.25rem)/.86 var(--sans);
  letter-spacing: -.075em;
}
.home-v4-copy h1 em { display: block; color: white; font: 400 .93em/.94 var(--serif); letter-spacing: -.02em; }
.home-v4-copy > p { max-width: 620px; color: #2f514a; font-size: 18px; line-height: 1.72; }
.home-v4-assurance { display: flex; flex-wrap: wrap; gap: 10px 20px; margin-top: 26px; color: #284d44; font-size: 11px; font-weight: 700; }
.home-v4-assurance span::before { content: "\2713"; margin-right: 6px; color: var(--v4-green); }

.evidence-demo-v4 { padding: 24px; color: white; background: #12231e; box-shadow: 0 38px 90px rgba(17, 45, 42, .27); }
.demo-v4-head { display: flex; justify-content: space-between; gap: 20px; padding-bottom: 17px; border-bottom: 1px solid rgba(255,255,255,.14); font-size: 10px; letter-spacing: .1em; }
.demo-v4-head b { color: var(--v4-yellow); }
.demo-v4-records { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 18px 0; }
.demo-v4-record { padding: 17px; background: rgba(255,255,255,.055); border: 1px solid rgba(255,255,255,.13); }
.demo-v4-record.warn { border-color: rgba(246,204,93,.7); }
.demo-v4-record span { color: #98aea6; font-size: 9px; }
.demo-v4-record b { display: block; margin: 12px 0 6px; font-size: 13px; }
.demo-v4-record code { color: #d5e4de; font-size: 11px; }
.demo-v4-toggle { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 4px; background: #091612; }
.demo-v4-toggle button { min-height: 45px; border: 0; color: #9fb0aa; background: transparent; cursor: pointer; font-weight: 800; }
.demo-v4-toggle button.active { color: var(--v4-ink); background: var(--v4-yellow); }
.demo-v4-result { margin-top: 12px; padding: 22px; background: #091612; border-left: 4px solid var(--v4-red); }
[data-conflict-stage][data-mode="guarded"] .demo-v4-result { border-color: #72dda9; }
.demo-v4-result span { color: #f0a998; font-size: 9px; }
[data-conflict-stage][data-mode="guarded"] .demo-v4-result span { color: #79e1b1; }
.demo-v4-result b { display: block; margin: 9px 0; font-size: 21px; }
.demo-v4-result small { color: #a9bbb4; }
.demo-v4-foot { display: flex; justify-content: space-between; gap: 12px; margin-top: 15px; color: #8da097; font-size: 9px; }

.home-v4-proof { color: white; background: var(--v4-deep); }
.home-v4-proof-grid { display: grid; grid-template-columns: 1.35fr repeat(3, 1fr); }
.home-v4-proof article { min-height: 132px; padding: 26px; border-right: 1px solid rgba(255,255,255,.13); }
.home-v4-proof article:first-child { color: var(--v4-ink); background: var(--v4-yellow); }
.home-v4-proof article:last-child { border-right: 0; }
.home-v4-proof b { display: block; font-size: 23px; }
.home-v4-proof span { display: block; margin-top: 8px; color: #b7c6c0; font-size: 11px; }
.home-v4-proof article:first-child span { color: #63552f; }

.risk-outcomes-v4 { display: grid; grid-template-columns: 1.05fr .95fr; gap: 18px; }
.risk-outcome-v4 { min-height: 480px; display: flex; flex-direction: column; justify-content: flex-end; padding: 42px; color: white; background: linear-gradient(180deg, rgba(11,27,23,.1), rgba(11,27,23,.93)), url("data-pipeline.webp") center/cover; }
.risk-outcome-v4 h3 { max-width: 720px; margin: 12px 0; font: 400 48px/1.02 var(--serif); }
.risk-controls-v4 { display: grid; gap: 12px; }
.risk-controls-v4 article { padding: 28px; background: var(--v4-paper); border: 1px solid var(--v4-line); }
.risk-controls-v4 span { color: var(--v4-green); font-size: 10px; font-weight: 800; }
.risk-controls-v4 h3 { margin: 20px 0 8px; font-size: 22px; }
.risk-controls-v4 p { margin: 0; color: var(--v4-muted); }

.stack-flow-v4 { position: relative; display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.stack-flow-v4::before { content: ""; position: absolute; left: 7%; right: 7%; top: 34px; height: 1px; background: var(--v4-line); }
.stack-flow-v4 article { position: relative; padding: 58px 22px 25px; background: var(--v4-paper); border: 1px solid var(--v4-line); }
.stack-flow-v4 i { position: absolute; top: 25px; left: 22px; width: 18px; height: 18px; overflow: hidden; border: 5px solid var(--v4-cream); border-radius: 50%; color: transparent; background: var(--v4-green); box-shadow: 0 0 0 1px var(--v4-green); font-size: 0; }
.stack-flow-v4 article.control { background: var(--v4-yellow-soft); border-color: var(--v4-yellow); }
.stack-flow-v4 small { color: var(--v4-green); font-size: 9px; font-weight: 800; }
.stack-flow-v4 h3 { margin: 14px 0 8px; font-size: 18px; }
.stack-flow-v4 p { margin: 0; color: var(--v4-muted); font-size: 12px; }

.home-v4-cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.home-v4-case { min-height: 330px; display: flex; flex-direction: column; padding: 28px; background: var(--v4-paper); border: 1px solid var(--v4-line); }
.home-v4-case.featured { background: var(--v4-yellow); border-color: var(--v4-yellow); }
.home-v4-case span { color: var(--v4-green); font-size: 10px; font-weight: 800; }
.home-v4-case h3 { margin: 54px 0 12px; font: 400 32px/1 var(--serif); }
.home-v4-case p { color: var(--v4-muted); }
.home-v4-case a { margin-top: auto; font-weight: 800; }
.home-v4-case.featured p { color: #66572e; }

/* Product: application map and capability matrix. */
.product-v4-intro { padding: 76px 0 42px; }
.product-v4-title { display: grid; grid-template-columns: .85fr 1.15fr; gap: 70px; align-items: end; }
.product-v4-title h1 { margin: 14px 0 0; font: 400 clamp(3.7rem, 6.8vw, 6.8rem)/.9 var(--serif); letter-spacing: -.035em; }
.product-v4-title aside { padding: 24px 0 8px 28px; border-left: 3px solid var(--v4-yellow); }
.product-v4-title aside b { display: block; font-size: 20px; }
.product-v4-title aside p { color: var(--v4-muted); }

.product-console-v4 { display: grid; grid-template-columns: 230px 1fr; min-height: 620px; color: white; background: var(--v4-deep); box-shadow: var(--v4-shadow); }
.product-rail-v4 { padding: 30px 20px; border-right: 1px solid rgba(255,255,255,.12); }
.product-rail-v4 b { display: block; padding-bottom: 24px; color: var(--v4-yellow); }
.product-rail-v4 span { display: block; margin: 5px 0; padding: 11px 12px; color: #9fb0aa; font-size: 12px; }
.product-rail-v4 span.active { color: white; background: rgba(145,228,231,.1); border-left: 2px solid var(--v4-teal); }
.product-screen-v4 { padding: 34px; }
.product-screen-head-v4 { display: flex; justify-content: space-between; align-items: center; padding-bottom: 24px; border-bottom: 1px solid rgba(255,255,255,.12); }
.product-screen-head-v4 small { color: #8ca199; }
.product-screen-head-v4 strong { padding: 7px 10px; color: #8ee1b7; border: 1px solid rgba(142,225,183,.35); font-size: 10px; }
.product-metrics-v4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 24px 0; }
.product-metrics-v4 article { padding: 18px; background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.11); }
.product-metrics-v4 span { display: block; color: #8fa29b; font-size: 9px; }
.product-metrics-v4 b { display: block; margin-top: 12px; font-size: 25px; }
.decision-feed-v4 { border: 1px solid rgba(255,255,255,.11); }
.decision-feed-v4 header, .decision-row-v4 { display: grid; grid-template-columns: 110px 1.2fr .9fr 110px; gap: 16px; align-items: center; padding: 15px 18px; }
.decision-feed-v4 header { color: #81968e; background: #091612; font-size: 9px; }
.decision-row-v4 { border-top: 1px solid rgba(255,255,255,.09); font-size: 12px; }
.decision-row-v4 code { color: #c5d6d0; }
.decision-row-v4 strong { justify-self: start; padding: 5px 7px; font-size: 9px; }
.decision-row-v4 .released { color: #76ddb0; background: rgba(118,221,176,.09); }
.decision-row-v4 .withheld { color: #f2a18d; background: rgba(242,161,141,.09); }
.decision-row-v4 .empty { color: #edcf7a; background: rgba(237,207,122,.09); }

.control-matrix-v4 { display: grid; grid-template-columns: repeat(2, 1fr); border: 1px solid var(--v4-line); }
.control-matrix-v4 article { min-height: 300px; padding: 36px; border-right: 1px solid var(--v4-line); border-bottom: 1px solid var(--v4-line); }
.control-matrix-v4 article:nth-child(2n) { border-right: 0; }
.control-matrix-v4 article:nth-last-child(-n+2) { border-bottom: 0; }
.control-matrix-v4 span { color: var(--v4-green); font-size: 10px; font-weight: 800; }
.control-matrix-v4 h3 { margin: 46px 0 12px; font: 400 38px/1 var(--serif); }
.control-matrix-v4 p { color: var(--v4-muted); }
.control-matrix-v4 strong { display: block; margin-top: 22px; font-size: 11px; }

.outcome-table-v4 { width: 100%; border-collapse: collapse; background: var(--v4-paper); border: 1px solid var(--v4-line); }
.outcome-table-v4 th, .outcome-table-v4 td { padding: 20px; text-align: left; border-bottom: 1px solid var(--v4-line); }
.outcome-table-v4 th { color: var(--v4-green); font-size: 10px; letter-spacing: .1em; }
.outcome-table-v4 td:first-child { font-weight: 800; }
.outcome-table-v4 tr:last-child td { border-bottom: 0; }

/* How it works: visual lifecycle rather than marketing cards. */
.flow-v4-hero { padding: 82px 0 68px; text-align: center; background: linear-gradient(180deg, var(--v4-teal-soft), var(--v4-cream)); }
.flow-v4-hero h1 { max-width: 950px; margin: 18px auto 20px; font: 700 clamp(3.7rem, 7vw, 6.9rem)/.9 var(--sans); letter-spacing: -.065em; }
.flow-v4-hero h1 em { color: var(--v4-green); font: 400 .98em/1 var(--serif); letter-spacing: -.02em; }
.flow-v4-hero p { max-width: 720px; margin-inline: auto; color: #46625b; font-size: 18px; }
.flow-rail-v4 { margin-top: 48px; display: grid; grid-template-columns: repeat(5, 1fr); background: var(--v4-deep); }
.flow-rail-v4 article { position: relative; padding: 25px 18px; color: white; border-right: 1px solid rgba(255,255,255,.12); text-align: left; }
.flow-rail-v4 article:last-child { border-right: 0; }
.flow-rail-v4 article.control { color: var(--v4-ink); background: var(--v4-yellow); }
.flow-rail-v4 b { display: block; font-size: 10px; }
.flow-rail-v4 span { display: block; margin-top: 18px; font-size: 14px; }

.lifecycle-v4 { display: grid; grid-template-columns: 180px 1fr; }
.lifecycle-v4-nav { align-self: start; position: sticky; top: 100px; }
.lifecycle-v4-nav span { display: block; padding: 12px 0; color: var(--v4-muted); border-bottom: 1px solid var(--v4-line); font-size: 11px; }
.lifecycle-v4-nav span.active { color: var(--v4-green); font-weight: 800; }
.lifecycle-v4-steps { border-left: 1px solid var(--v4-line); }
.lifecycle-step-v4 { position: relative; display: grid; grid-template-columns: 90px 1fr 1fr; gap: 34px; padding: 45px 0 45px 55px; border-bottom: 1px solid var(--v4-line); }
.lifecycle-step-v4::before { content: ""; position: absolute; left: -8px; top: 52px; width: 15px; height: 15px; border-radius: 50%; background: var(--v4-green); box-shadow: 0 0 0 7px var(--v4-cream); }
.lifecycle-step-v4 > b { color: var(--v4-green); font: 400 42px/1 var(--serif); }
.lifecycle-step-v4 h2 { margin: 0 0 10px; font-size: 24px; }
.lifecycle-step-v4 p { margin: 0; color: var(--v4-muted); }
.lifecycle-step-v4 aside { padding: 18px; background: var(--v4-paper); border: 1px solid var(--v4-line); }
.lifecycle-step-v4 aside code { color: var(--v4-blue); font-size: 11px; }

.decision-tree-v4 { display: grid; grid-template-columns: .8fr 1.2fr; gap: 18px; }
.decision-tree-copy-v4 { padding: 42px; background: var(--v4-yellow); }
.decision-tree-copy-v4 h2 { font: 400 48px/1 var(--serif); }
.decision-tree-copy-v4 p { color: #665733; }
.decision-tree-map-v4 { display: grid; gap: 1px; padding: 1px; background: var(--v4-line); }
.decision-tree-map-v4 article { display: grid; grid-template-columns: 130px 1fr 110px; align-items: center; gap: 20px; padding: 24px; background: var(--v4-paper); }
.decision-tree-map-v4 b { font-size: 12px; }
.decision-tree-map-v4 p { margin: 0; color: var(--v4-muted); }
.decision-tree-map-v4 strong { justify-self: end; font-size: 10px; }
.decision-tree-map-v4 .go { color: var(--v4-green); }
.decision-tree-map-v4 .stop { color: var(--v4-red); }

/* Solutions: industry stories with explicit operational outcomes. */
.solutions-v4-header { padding: 72px 0 30px; }
.solutions-v4-header h1 { max-width: 1000px; margin: 18px 0 24px; font: 400 clamp(3.8rem, 6.8vw, 6.8rem)/.92 var(--serif); }
.solutions-v4-header p { max-width: 760px; color: var(--v4-muted); font-size: 18px; }
.solution-index-v4 { display: flex; overflow-x: auto; border-block: 1px solid var(--v4-line); }
.solution-index-v4 a { min-width: 190px; padding: 18px 22px; border-right: 1px solid var(--v4-line); font-size: 12px; font-weight: 800; }
.solution-index-v4 a:hover { background: var(--v4-yellow-soft); }

.solution-case-v4 { display: grid; grid-template-columns: 210px 1fr; gap: 56px; padding: 78px 0; border-bottom: 1px solid var(--v4-line); scroll-margin-top: 90px; }
.solution-case-v4 > header span { color: var(--v4-green); font-size: 10px; font-weight: 800; }
.solution-case-v4 > header b { display: block; margin-top: 20px; font-size: 14px; }
.solution-story-v4 { display: grid; grid-template-columns: 1.05fr .95fr; gap: 16px; }
.solution-story-v4 > article { padding: 35px; background: var(--v4-paper); border: 1px solid var(--v4-line); }
.solution-story-v4 h2 { margin: 0 0 18px; font: 400 44px/1 var(--serif); }
.solution-story-v4 p { color: var(--v4-muted); }
.solution-before-v4 { background: var(--v4-deep) !important; color: white; }
.solution-before-v4 p { color: #aebdb7; }
.solution-chain-v4 { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 10px; align-items: center; margin-top: 28px; }
.solution-chain-v4 span { padding: 13px; text-align: center; background: var(--v4-sand); border: 1px solid var(--v4-line); font-size: 11px; }
.solution-chain-v4 i { font-style: normal; color: var(--v4-green); }
.solution-goals-v4 { margin-top: 22px; padding: 22px; background: var(--v4-yellow-soft); }
.solution-goals-v4 b { display: block; margin-bottom: 8px; }
.solution-goals-v4 small { color: #665a3b; }

.savings-v4 { display: grid; grid-template-columns: 1fr .8fr; gap: 18px; }
.savings-v4-inputs { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding: 32px; background: var(--v4-paper); border: 1px solid var(--v4-line); }
.savings-v4 label { display: grid; gap: 7px; color: var(--v4-muted); font-size: 11px; }
.savings-v4 input { width: 100%; padding: 13px; color: var(--v4-ink); background: white; border: 1px solid var(--v4-line); }
.savings-v4-result { display: flex; flex-direction: column; justify-content: center; padding: 36px; color: white; background: var(--v4-deep); }
.savings-v4-result span { color: #9eafa8; font-size: 9px; }
.savings-v4-result b { margin: 8px 0 22px; color: var(--v4-yellow); font: 400 36px/1 var(--serif); }
.savings-v4-result small { color: #aab9b3; }

/* Proof: a report, not another marketing page. */
.proof-v4 { background: #f2eee4; }
.proof-v4-report { margin: 58px auto 90px; background: var(--v4-paper); border: 1px solid #cfc6b5; box-shadow: 0 30px 80px rgba(40,33,21,.13); }
.proof-v4-cover { display: grid; grid-template-columns: 1.2fr .8fr; min-height: 500px; }
.proof-v4-cover-copy { padding: 55px; }
.proof-v4-cover-copy h1 { margin: 40px 0 24px; font: 400 clamp(4rem, 7vw, 7rem)/.86 var(--serif); }
.proof-v4-cover-copy p { max-width: 620px; color: var(--v4-muted); font-size: 17px; }
.proof-v4-cover-meta { padding: 44px; color: white; background: var(--v4-deep); }
.proof-v4-cover-meta span { display: block; color: #98aaa3; font-size: 10px; }
.proof-v4-cover-meta b { display: block; margin: 8px 0 28px; font-size: 18px; }
.proof-v4-chapter { padding: 55px; border-top: 1px solid var(--v4-line); }
.proof-v4-chapter-head { display: grid; grid-template-columns: 100px 1fr; gap: 24px; margin-bottom: 32px; }
.proof-v4-chapter-head > b { color: var(--v4-green); font: 400 42px/1 var(--serif); }
.proof-v4-chapter-head h2 { margin: 0; font-size: 30px; }
.proof-v4-chapter-head p { color: var(--v4-muted); }
.benchmark-v4-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--v4-line); }
.benchmark-v4-grid article { min-height: 180px; padding: 24px; border-right: 1px solid var(--v4-line); }
.benchmark-v4-grid article:last-child { border-right: 0; }
.benchmark-v4-grid span { color: var(--v4-green); font-size: 9px; }
.benchmark-v4-grid b { display: block; margin: 30px 0 8px; font: 400 36px/1 var(--serif); }
.benchmark-v4-grid small { color: var(--v4-muted); }
.claim-ledger-v4 { width: 100%; border-collapse: collapse; }
.claim-ledger-v4 th, .claim-ledger-v4 td { padding: 18px 14px; text-align: left; border-bottom: 1px solid var(--v4-line); vertical-align: top; }
.claim-ledger-v4 th { color: var(--v4-green); font-size: 9px; letter-spacing: .1em; }
.claim-ledger-v4 td { font-size: 13px; }
.claim-ledger-v4 td:last-child { color: var(--v4-muted); }
.proof-v4-boundary { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.proof-v4-boundary article { padding: 28px; background: var(--v4-sand); }
.proof-v4-boundary h3 { margin-top: 0; }
.proof-v4-boundary p { color: var(--v4-muted); }

/* Developers: intentionally technical and dark. */
.developer-v4 { color: #eaf4f0; background: #091511; }
.developer-v4 .topbar { background: rgba(9,21,17,.95); border-color: rgba(255,255,255,.11); }
.developer-v4 .brand, .developer-v4 .nav-links a { color: #eaf4f0; }
.developer-v4 .brand small { color: #96aaa2; }
.developer-v4 .nav-links a.active, .developer-v4 .nav-links a:hover { color: white; background: rgba(145,228,231,.08); }
.developer-v4 .nav-links .nav-cta { color: #091511; background: var(--v4-yellow); }
.developer-v4-main { min-height: 100vh; }
.developer-v4-hero { padding: 74px 0 48px; border-bottom: 1px solid rgba(255,255,255,.12); }
.developer-v4-hero-grid { display: grid; grid-template-columns: 1fr .9fr; gap: 80px; align-items: center; }
.developer-v4-hero h1 { margin: 18px 0 24px; font: 700 clamp(3.5rem, 6.5vw, 6rem)/.9 var(--sans); letter-spacing: -.065em; }
.developer-v4-hero h1 em { color: var(--v4-teal); font: 400 .96em/1 var(--serif); letter-spacing: -.02em; }
.developer-v4-hero p { color: #9db0a8; font-size: 17px; }
.code-window-v4 { border: 1px solid rgba(255,255,255,.14); background: #050d0a; }
.code-window-v4 header { display: flex; justify-content: space-between; padding: 12px 16px; color: #82978f; background: #0d1d18; border-bottom: 1px solid rgba(255,255,255,.1); font-size: 10px; }
.code-window-v4 pre { margin: 0; padding: 25px; overflow: auto; color: #c9ded6; font: 12px/1.75 ui-monospace, SFMono-Regular, Menlo, monospace; }
.code-window-v4 .accent { color: var(--v4-yellow); }
.developer-v4 .v4-button.secondary { color: white; border-color: rgba(255,255,255,.4); background: transparent; }

.docs-layout-v4 { display: grid; grid-template-columns: 230px 1fr; }
.docs-sidebar-v4 { position: sticky; top: 82px; align-self: start; min-height: calc(100vh - 82px); padding: 35px 24px; border-right: 1px solid rgba(255,255,255,.11); }
.docs-sidebar-v4 b { display: block; margin-bottom: 20px; color: var(--v4-yellow); font-size: 11px; }
.docs-sidebar-v4 a { display: block; padding: 9px 0; color: #8fa39b; font-size: 12px; }
.docs-sidebar-v4 a:hover { color: white; }
.docs-content-v4 { padding: 70px 0 100px 65px; }
.docs-block-v4 { max-width: 850px; padding-bottom: 65px; margin-bottom: 65px; border-bottom: 1px solid rgba(255,255,255,.11); }
.docs-block-v4 h2 { margin: 10px 0 14px; color: white; font-size: 34px; }
.docs-block-v4 > p { color: #9db0a8; }
.contract-grid-v4 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 24px; }
.contract-grid-v4 article { padding: 21px; background: #0e211a; border: 1px solid rgba(255,255,255,.1); }
.contract-grid-v4 b { color: var(--v4-teal); font-size: 11px; }
.contract-grid-v4 p { color: #95aaa1; font-size: 12px; }
.developer-boundary-v4 { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; margin-top: 24px; background: rgba(255,255,255,.12); }
.developer-boundary-v4 article { padding: 24px; background: #0b1915; }
.developer-boundary-v4 span { color: var(--v4-yellow); font-size: 9px; }
.developer-boundary-v4 p { color: #96aaa2; font-size: 12px; }

/* Lab: an application surface, not a marketing hero. */
.lab-v4 { background: #e9eee8; }
.lab-app-v4 { min-height: calc(100vh - 83px); display: grid; grid-template-columns: 230px 1fr; }
.lab-sidebar-v4 { padding: 30px 20px; color: white; background: var(--v4-deep); }
.lab-sidebar-v4 > b { display: block; padding-bottom: 24px; color: var(--v4-yellow); }
.lab-sidebar-v4 small { color: #82978e; }
.lab-scenario-v4 { width: 100%; margin-top: 10px; padding: 14px; text-align: left; color: #afc0b9; background: transparent; border: 1px solid rgba(255,255,255,.12); cursor: pointer; }
.lab-scenario-v4.active { color: white; background: rgba(145,228,231,.09); border-color: rgba(145,228,231,.36); }
.lab-sidebar-note-v4 { margin-top: 28px; padding: 16px; color: #9db0a8; background: #091511; font-size: 11px; }
.lab-workspace-v4 { padding: 28px; }
.lab-toolbar-v4 { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.lab-toolbar-v4 h1 { margin: 0; font-size: 25px; }
.lab-toolbar-v4 span { padding: 7px 10px; color: var(--v4-green); background: #d9f2e6; font-size: 9px; font-weight: 800; }
.lab-grid-v4 { display: grid; grid-template-columns: 1fr 340px; gap: 18px; }
.lab-canvas-v4 { padding: 28px; background: var(--v4-paper); border: 1px solid var(--v4-line); }
.lab-canvas-head-v4 { display: flex; justify-content: space-between; gap: 20px; padding-bottom: 20px; border-bottom: 1px solid var(--v4-line); }
.lab-canvas-head-v4 p { margin: 4px 0 0; color: var(--v4-muted); font-size: 12px; }
.lab-canvas-head-v4 code { color: var(--v4-green); }
.lab-sources-v4 { display: grid; grid-template-columns: 1fr 80px 1fr; gap: 12px; align-items: center; margin: 40px 0; }
.lab-source-v4 { min-height: 180px; padding: 22px; background: var(--v4-sand); border: 1px solid var(--v4-line); }
.lab-source-v4.warn { background: var(--v4-yellow-soft); border-color: var(--v4-yellow); }
.lab-source-v4 span { color: var(--v4-muted); font-size: 9px; }
.lab-source-v4 b { display: block; margin: 20px 0 8px; }
.lab-source-v4 code { font-size: 11px; }
.lab-join-v4 { text-align: center; }
.lab-join-v4 i { display: grid; place-items: center; width: 54px; height: 54px; margin: auto; border-radius: 50%; color: white; background: var(--v4-green); font-style: normal; }
.lab-join-v4 small { display: block; margin-top: 8px; color: var(--v4-muted); }
.lab-inspector-v4 { color: white; background: var(--v4-deep); }
.lab-inspector-v4 > header { padding: 20px; border-bottom: 1px solid rgba(255,255,255,.12); }
.lab-inspector-v4 > header span { color: #8da198; font-size: 9px; }
.lab-inspector-v4 .demo-v4-toggle { margin: 18px; }
.lab-inspector-v4 .demo-v4-result { margin: 18px; }
.lab-inspector-list-v4 { padding: 0 18px 18px; }
.lab-inspector-list-v4 div { display: flex; justify-content: space-between; gap: 15px; padding: 11px 0; color: #9db0a8; border-bottom: 1px solid rgba(255,255,255,.1); font-size: 10px; }
.lab-inspector-list-v4 b { color: white; }
.lab-next-v4 { display: flex; justify-content: space-between; align-items: center; gap: 20px; margin-top: 18px; padding: 20px; background: var(--v4-yellow); }
.lab-next-v4 p { margin: 0; color: #61542f; }

/* RCA: an operations console with an evidence timeline. */
.rca-v4 { background: #eef1ed; }
.rca-intro-v4 { padding: 62px 0 34px; }
.rca-intro-v4-grid { display: grid; grid-template-columns: 1fr .7fr; gap: 70px; align-items: end; }
.rca-intro-v4 h1 { margin: 15px 0 18px; font: 400 clamp(3.5rem, 6vw, 6rem)/.92 var(--serif); }
.rca-intro-v4 p { color: var(--v4-muted); font-size: 17px; }
.rca-intro-note-v4 { padding: 24px; background: var(--v4-yellow-soft); border-left: 4px solid var(--v4-yellow); }
.rca-intro-note-v4 b { display: block; margin-bottom: 8px; }
.rca-intro-note-v4 span { color: #665b3c; font-size: 12px; }
.rca-console-v4 { display: grid; grid-template-columns: 240px 1fr 300px; min-height: 640px; margin-bottom: 90px; color: white; background: #0b1714; box-shadow: var(--v4-shadow); }
.incident-list-v4 { border-right: 1px solid rgba(255,255,255,.11); }
.incident-list-v4 header { padding: 22px; border-bottom: 1px solid rgba(255,255,255,.11); }
.incident-list-v4 header b { display: block; }
.incident-list-v4 header small { color: #83968f; }
.incident-item-v4 { padding: 18px 22px; border-bottom: 1px solid rgba(255,255,255,.08); }
.incident-item-v4.active { background: rgba(246,204,93,.09); border-left: 3px solid var(--v4-yellow); }
.incident-item-v4 span { color: #f1a18e; font-size: 9px; }
.incident-item-v4 b { display: block; margin: 8px 0; font-size: 12px; }
.incident-item-v4 small { color: #849890; }
.rca-timeline-v4 { padding: 30px; }
.rca-timeline-head-v4 { display: flex; justify-content: space-between; gap: 20px; padding-bottom: 20px; border-bottom: 1px solid rgba(255,255,255,.11); }
.rca-timeline-head-v4 span { color: #8da198; font-size: 9px; }
.timeline-v4 { position: relative; margin-top: 30px; padding-left: 28px; }
.timeline-v4::before { content: ""; position: absolute; left: 6px; top: 8px; bottom: 8px; width: 1px; background: rgba(255,255,255,.17); }
.timeline-event-v4 { position: relative; display: grid; grid-template-columns: 80px 1fr; gap: 18px; padding: 0 0 28px; }
.timeline-event-v4::before { content: ""; position: absolute; left: -27px; top: 5px; width: 11px; height: 11px; border-radius: 50%; background: var(--v4-teal); box-shadow: 0 0 0 5px #0b1714; }
.timeline-event-v4.warn::before { background: var(--v4-red); }
.timeline-event-v4 time { color: #7f958c; font-size: 10px; }
.timeline-event-v4 b { display: block; font-size: 12px; }
.timeline-event-v4 p { margin: 5px 0 0; color: #91a59d; font-size: 11px; }
.rca-facts-v4 { padding: 25px; background: #0f211b; border-left: 1px solid rgba(255,255,255,.11); }
.rca-facts-v4 > span { color: var(--v4-yellow); font-size: 9px; }
.rca-fact-v4 { padding: 16px 0; border-bottom: 1px solid rgba(255,255,255,.1); }
.rca-fact-v4 small { display: block; color: #81968e; }
.rca-fact-v4 b { display: block; margin-top: 5px; font-size: 12px; }
.rca-boundary-v4 { margin-top: 22px; padding: 17px; color: #edc77a; background: #09130f; font-size: 11px; }
.rca-fit-v4 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.rca-fit-v4 article { padding: 30px; background: var(--v4-paper); border: 1px solid var(--v4-line); }
.rca-fit-v4 span { color: var(--v4-green); font-size: 10px; font-weight: 800; }
.rca-fit-v4 h3 { margin: 30px 0 10px; }
.rca-fit-v4 p { color: var(--v4-muted); }

.v4-cta { padding: 74px 0; background: var(--v4-yellow); }
.v4-cta-grid { display: grid; grid-template-columns: 1fr auto; gap: 50px; align-items: center; }
.v4-cta h2 { margin: 0; max-width: 850px; font: 400 clamp(2.8rem, 5vw, 4.8rem)/.96 var(--serif); }
.v4-cta p { margin-bottom: 0; color: #625431; }

@media (max-width: 1020px) {
  .home-v4-grid, .product-v4-title, .proof-v4-cover, .developer-v4-hero-grid, .rca-intro-v4-grid { grid-template-columns: 1fr; }
  .home-v4-grid { gap: 45px; }
  .home-v4-proof-grid { grid-template-columns: 1fr 1fr; }
  .risk-outcomes-v4, .decision-tree-v4, .solution-story-v4, .savings-v4 { grid-template-columns: 1fr; }
  .stack-flow-v4 { grid-template-columns: 1fr 1fr; }
  .stack-flow-v4::before { display: none; }
  .product-console-v4 { grid-template-columns: 190px 1fr; }
  .product-metrics-v4 { grid-template-columns: 1fr 1fr; }
  .lifecycle-step-v4 { grid-template-columns: 70px 1fr; }
  .lifecycle-step-v4 aside { grid-column: 2; }
  .solution-case-v4 { grid-template-columns: 1fr; gap: 26px; }
  .benchmark-v4-grid { grid-template-columns: 1fr 1fr; }
  .benchmark-v4-grid article:nth-child(2) { border-right: 0; }
  .benchmark-v4-grid article { border-bottom: 1px solid var(--v4-line); }
  .lab-app-v4 { grid-template-columns: 190px 1fr; }
  .lab-grid-v4 { grid-template-columns: 1fr; }
  .rca-console-v4 { grid-template-columns: 210px 1fr; }
  .rca-facts-v4 { grid-column: 1 / -1; border-left: 0; border-top: 1px solid rgba(255,255,255,.11); }
}

@media (max-width: 760px) {
  .v4-container { width: min(100% - 28px, 1180px); }
  .v4-section { padding: 64px 0; }
  .v4-section-head { grid-template-columns: 1fr; gap: 18px; }
  .home-v4-hero { min-height: 0; padding: 52px 0; }
  .home-v4-copy h1 { font-size: 4rem; }
  .demo-v4-records, .home-v4-proof-grid, .home-v4-cases, .control-matrix-v4, .product-metrics-v4, .benchmark-v4-grid, .contract-grid-v4, .developer-boundary-v4, .rca-fit-v4 { grid-template-columns: 1fr; }
  .home-v4-proof article, .benchmark-v4-grid article { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.13); }
  .risk-outcome-v4 { min-height: 390px; padding: 28px; }
  .risk-outcome-v4 h3 { font-size: 38px; }
  .stack-flow-v4 { grid-template-columns: 1fr; }
  .product-v4-intro { padding-top: 50px; }
  .product-v4-title h1 { font-size: 4.2rem; }
  .product-console-v4 { grid-template-columns: 1fr; min-height: 0; }
  .product-rail-v4 { display: none; }
  .product-screen-v4 { padding: 20px; overflow-x: auto; }
  .decision-feed-v4 { min-width: 670px; }
  .control-matrix-v4 article, .control-matrix-v4 article:nth-child(2n) { border-right: 0; border-bottom: 1px solid var(--v4-line); }
  .outcome-table-v4 { display: block; overflow-x: auto; white-space: nowrap; }
  .flow-v4-hero { padding-top: 54px; }
  .flow-v4-hero h1 { font-size: 4rem; }
  .flow-rail-v4 { grid-template-columns: 1fr; }
  .flow-rail-v4 article { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.12); }
  .lifecycle-v4 { grid-template-columns: 1fr; }
  .lifecycle-v4-nav { position: static; display: flex; overflow-x: auto; }
  .lifecycle-v4-nav span { min-width: max-content; padding: 10px 14px; }
  .lifecycle-v4-steps { border-left: 0; }
  .lifecycle-step-v4 { grid-template-columns: 1fr; padding-left: 0; }
  .lifecycle-step-v4::before { display: none; }
  .lifecycle-step-v4 aside { grid-column: auto; }
  .decision-tree-map-v4 article { grid-template-columns: 1fr; }
  .decision-tree-map-v4 strong { justify-self: start; }
  .solutions-v4-header h1 { font-size: 4rem; }
  .solution-chain-v4 { grid-template-columns: 1fr; }
  .solution-chain-v4 i { transform: rotate(90deg); justify-self: center; }
  .savings-v4-inputs { grid-template-columns: 1fr; }
  .proof-v4-report { margin-top: 25px; }
  .proof-v4-cover-copy, .proof-v4-cover-meta, .proof-v4-chapter { padding: 30px; }
  .proof-v4-cover-copy h1 { font-size: 4rem; }
  .proof-v4-chapter-head { grid-template-columns: 1fr; }
  .proof-v4-boundary { grid-template-columns: 1fr; }
  .claim-ledger-v4 { display: block; overflow-x: auto; white-space: nowrap; }
  .developer-v4 .nav-links.open { background: #0d1d18; border-color: rgba(255,255,255,.14); }
  .developer-v4-hero h1 { font-size: 3.8rem; }
  .docs-layout-v4 { grid-template-columns: 1fr; }
  .docs-sidebar-v4 { position: static; min-height: 0; display: flex; gap: 15px; overflow-x: auto; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.11); }
  .docs-sidebar-v4 b { display: none; }
  .docs-sidebar-v4 a { min-width: max-content; }
  .docs-content-v4 { padding: 55px 14px; }
  .lab-app-v4 { grid-template-columns: 1fr; }
  .lab-sidebar-v4 { display: none; }
  .lab-workspace-v4 { padding: 14px; }
  .lab-toolbar-v4 { align-items: flex-start; flex-direction: column; }
  .lab-sources-v4 { grid-template-columns: 1fr; }
  .lab-join-v4 i { transform: rotate(90deg); }
  .lab-next-v4 { align-items: flex-start; flex-direction: column; }
  .rca-intro-v4 h1 { font-size: 4rem; }
  .rca-console-v4 { grid-template-columns: 1fr; margin-bottom: 64px; }
  .incident-list-v4 { display: none; }
  .rca-timeline-v4 { padding: 22px; }
  .timeline-event-v4 { grid-template-columns: 65px 1fr; }
  .v4-cta-grid { grid-template-columns: 1fr; gap: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}