:root {
  --porcelain: #f6f4ef;
  --paper: #fffefa;
  --white: #ffffff;
  --graphite: #111820;
  --ink: #24303d;
  --slate: #475467;
  --mist: #667085;
  --line: #d9dee6;
  --line-strong: #c8ced8;
  --blue: #315cff;
  --blue-dark: #2446c8;
  --teal: #0a7c66;
  --violet: #6557d8;
  --gold: #8a6800;
  --rose: #8f3445;
  --dark: #101720;
  --dark-2: #16212e;
  --dark-3: #0b1118;
  --max: 1180px;
  --reading: 760px;
  --radius: 12px;
  --shadow: 0 18px 54px rgba(16, 24, 32, 0.08);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font); color: var(--graphite); background: var(--porcelain); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
img { max-width: 100%; }
a { color: inherit; }
p { margin-top: 0; }
code, pre { font-family: var(--mono); }

.skip-link { position: absolute; top: -120px; left: 18px; z-index: 30; background: var(--graphite); color: var(--white); padding: 10px 14px; text-decoration: none; border-radius: 0 0 8px 8px; }
.skip-link:focus { top: 0; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }

.site-header { position: sticky; top: 0; z-index: 20; background: rgba(246, 244, 239, 0.94); border-bottom: 1px solid rgba(217, 222, 230, 0.94); backdrop-filter: blur(18px); }
.nav { max-width: var(--max); margin: 0 auto; padding: 14px 24px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--graphite); text-decoration: none; font-weight: 780; letter-spacing: -0.03em; flex: 0 0 auto; }
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.nav-links { display: flex; align-items: center; gap: 18px; font-size: 14px; font-weight: 680; color: var(--slate); }
.nav-links a { text-decoration: none; white-space: nowrap; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--blue); }
.nav-cta { border: 1px solid var(--line-strong); border-radius: 999px; padding: 9px 14px; background: var(--white); color: var(--graphite) !important; }
.nav-cta:hover { border-color: var(--graphite); }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
section { padding: 84px 0; }

.hero { min-height: 560px; display: flex; align-items: center; position: relative; overflow: hidden; border-bottom: 1px solid rgba(217, 222, 230, 0.82); background: var(--porcelain); }
.hero-content { width: min(820px, 100%); padding: 82px 0 92px; }
.proof-hero { min-height: 690px; background: radial-gradient(circle at 82% 15%, rgba(49,92,255,.09), transparent 27%), linear-gradient(180deg, #faf9f5 0%, var(--porcelain) 100%); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(400px, .92fr); gap: 60px; align-items: center; padding-top: 74px; padding-bottom: 92px; }
.hero-copy { max-width: 690px; }
.eyebrow, .kicker, .card-kicker { color: var(--blue); font: 750 12px / 1 var(--mono); letter-spacing: .14em; text-transform: uppercase; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 22px; }
.eyebrow::before { content: ""; width: 34px; height: 1px; background: var(--blue); }
h1, .page-title { font-size: clamp(46px, 6.8vw, 82px); line-height: .96; letter-spacing: -.065em; margin: 0; color: var(--graphite); max-width: 900px; }
.hero p { max-width: 720px; color: var(--slate); font-size: clamp(18px, 2vw, 22px); line-height: 1.58; margin: 25px 0 0; }
.hero-note { font-size: 13px !important; line-height: 1.5 !important; color: var(--mist) !important; max-width: 540px !important; }
.button-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 31px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 13px 20px; border-radius: 999px; text-decoration: none; font-weight: 740; border: 1px solid transparent; transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease; }
.button:hover { transform: translateY(-1px); }
.button.primary { color: var(--white); background: var(--graphite); box-shadow: 0 10px 28px rgba(17,24,32,.14); }
.button.primary:hover { background: #000; }
.button.secondary { color: var(--graphite); background: var(--white); border-color: var(--line-strong); }
.button.secondary:hover { border-color: var(--graphite); }

.proof-window { background: var(--dark-3); color: #e8edf5; border: 1px solid #263343; border-radius: 16px; overflow: hidden; box-shadow: 0 32px 80px rgba(16,24,32,.22); }
.proof-window-bar { min-height: 48px; display: flex; align-items: center; gap: 8px; padding: 0 16px; border-bottom: 1px solid rgba(255,255,255,.1); background: #111a25; }
.proof-window-bar span { width: 10px; height: 10px; border-radius: 50%; background: #49586b; }
.proof-window-bar span:first-child { background: #8f3445; }
.proof-window-bar span:nth-child(2) { background: #8a6800; }
.proof-window-bar span:nth-child(3) { background: #0a7c66; }
.proof-window-bar b { margin-left: auto; color: #97a5b8; font: 650 11px/1 var(--mono); text-transform: uppercase; letter-spacing: .09em; }
.proof-block { padding: 18px 20px; border-bottom: 1px solid rgba(255,255,255,.08); }
.proof-label { color: #7dd3c0; font: 700 11px/1 var(--mono); text-transform: uppercase; letter-spacing: .11em; margin-bottom: 11px; }
.proof-block code { display: block; color: #f7f9fc; font-size: 15px; line-height: 1.6; }
.proof-block p { margin: 0; color: #b7c2d0; font-size: 14px; line-height: 1.55; }
.proof-trace code + code { margin-top: 5px; }
.proof-result { display: flex; align-items: center; gap: 12px; padding: 18px 20px; background: rgba(10,124,102,.12); border-bottom: 1px solid rgba(255,255,255,.08); }
.proof-result strong { font-size: 14px; }
.result-badge { display: inline-flex; align-items: center; justify-content: center; min-width: 52px; padding: 7px 9px; border-radius: 999px; font: 800 10px/1 var(--mono); letter-spacing: .08em; }
.result-badge.pass { color: #c8ffef; background: rgba(10,124,102,.45); border: 1px solid rgba(125,211,192,.35); }
.result-badge.fail { color: #ffe2e8; background: rgba(143,52,69,.45); border: 1px solid rgba(255,182,197,.35); }
.proof-meta { display: flex; flex-wrap: wrap; gap: 8px; padding: 14px 20px 18px; }
.proof-meta span { padding: 6px 8px; border: 1px solid rgba(255,255,255,.12); border-radius: 999px; color: #8493a8; font: 650 10px/1 var(--mono); text-transform: uppercase; letter-spacing: .05em; }

.status-strip { position: relative; z-index: 2; margin-top: -38px; padding: 0; }
.status-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; background: var(--white); border: 1px solid var(--line); border-radius: 12px; padding: 10px; box-shadow: var(--shadow); }
.status-item { padding: 17px; border-radius: 9px; background: #fbfaf7; }
.status-item b { display: block; font-size: 14px; letter-spacing: -.01em; margin-bottom: 6px; }
.status-item span { display: block; color: var(--mist); font-size: 13px; line-height: 1.42; }

.section-head { margin-bottom: 30px; }
.split-head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(320px, .72fr); gap: 54px; align-items: end; }
.kicker { margin-bottom: 13px; }
h2 { max-width: 860px; font-size: clamp(32px, 5vw, 56px); line-height: 1; letter-spacing: -.055em; margin: 0; }
h3 { letter-spacing: -.025em; }
.section-intro { max-width: var(--reading); color: var(--slate); font-size: 18px; line-height: 1.65; margin: 17px 0 0; }

.problem-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
.problem-card { min-height: 270px; padding: 27px; background: rgba(255,255,255,.78); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 14px 44px rgba(16,24,32,.045); }
.problem-number { color: var(--blue); font: 800 12px/1 var(--mono); letter-spacing: .08em; }
.problem-card h3 { font-size: 24px; margin: 66px 0 12px; }
.problem-card p { color: var(--slate); line-height: 1.62; margin: 0; }

.technical-band { color: var(--white); background: var(--dark); border-top: 1px solid rgba(255,255,255,.08); border-bottom: 1px solid rgba(255,255,255,.08); }
.technical-band h2, .technical-band .section-intro { color: var(--white); }
.technical-band .section-intro { color: #bdc8d7; }
.technical-band .kicker { color: #7dd3c0; }
.architecture-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
.architecture-card { min-height: 320px; padding: 26px; border-radius: var(--radius); background: var(--dark-2); border: 1px solid rgba(255,255,255,.1); display: flex; flex-direction: column; }
.architecture-tag { color: #7dd3c0; font: 700 11px/1.2 var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.architecture-card h3 { font-size: 27px; margin: 58px 0 13px; }
.architecture-card p { color: #b8c4d3; line-height: 1.6; }
.inline-arrow { margin-top: auto; color: #fff; font-weight: 720; text-decoration: none; }
.inline-arrow::after { content: " →"; color: #7dd3c0; }
.inline-arrow:hover { text-decoration: underline; }
.engine-rail { margin-top: 16px; padding: 20px 24px; display: grid; grid-template-columns: auto auto 1fr; align-items: center; gap: 14px; border: 1px solid rgba(255,255,255,.1); border-radius: var(--radius); background: #0b1118; }
.engine-rail span { color: #7f8fa4; font: 700 10px/1 var(--mono); text-transform: uppercase; letter-spacing: .1em; }
.engine-rail strong { font-size: 18px; }
.engine-rail p { margin: 0 0 0 12px; color: #aab8c8; line-height: 1.5; font-size: 14px; }

.evidence-layout { display: grid; grid-template-columns: 1.06fr .94fr; gap: 70px; align-items: center; }
.evidence-list { margin-top: 34px; border-top: 1px solid var(--line); }
.evidence-list > div { display: grid; grid-template-columns: 42px 1fr; gap: 15px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.evidence-list span { color: var(--blue); font: 750 11px/1.6 var(--mono); }
.evidence-list p { margin: 0; color: var(--slate); line-height: 1.58; }
.evidence-list strong { color: var(--graphite); }
.manifest-card { border-radius: 15px; overflow: hidden; background: var(--dark-3); color: #dfe7f1; box-shadow: 0 28px 72px rgba(16,24,32,.18); border: 1px solid #273547; }
.manifest-top, .manifest-footer { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 15px 18px; background: #111a25; color: #95a4b8; font: 650 11px/1 var(--mono); }
.manifest-top { border-bottom: 1px solid rgba(255,255,255,.1); }
.manifest-footer { border-top: 1px solid rgba(255,255,255,.1); }
.manifest-card pre { margin: 0; padding: 24px; overflow-x: auto; color: #d7fbe8; font-size: 13px; line-height: 1.7; }

.soft-band { background: #ece9e2; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.audience-grid, .artifact-grid, .outcome-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.audience-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.audience-card, .artifact-card, .outcome-card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: 0 12px 34px rgba(16,24,32,.055); }
.audience-card { min-height: 285px; display: flex; flex-direction: column; }
.audience-card h3, .artifact-card h3, .outcome-card h3 { margin: 18px 0 10px; font-size: 22px; }
.audience-card p, .artifact-card p, .outcome-card p { color: var(--slate); line-height: 1.58; }
.card-kicker { font-size: 10px; letter-spacing: .1em; }
.text-link { margin-top: auto; color: var(--blue); font-weight: 760; text-decoration: none; }
.text-link:hover { text-decoration: underline; }

.stack-layout { display: grid; grid-template-columns: 1fr .95fr; gap: 80px; align-items: start; }
.stack-copy > p { color: var(--slate); font-size: 18px; line-height: 1.65; }
.pill-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 20px; }
.pill { border: 1px solid var(--line-strong); border-radius: 999px; padding: 8px 11px; background: var(--white); color: var(--mist); font: 700 11px/1 var(--mono); letter-spacing: .035em; text-transform: uppercase; }
.pill.blue { color: var(--blue); border-color: rgba(49,92,255,.24); }
.pill.teal { color: var(--teal); border-color: rgba(10,124,102,.24); }
.pill.violet { color: var(--violet); border-color: rgba(101,87,216,.24); }
.pill.gold { color: var(--gold); border-color: rgba(138,104,0,.24); }

.review-section { background: var(--white); border-top: 1px solid var(--line); }
.review-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 62px; align-items: start; }
.review-promises { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 25px; }
.review-promises span { padding: 7px 9px; border-radius: 999px; border: 1px solid var(--line); color: var(--mist); font: 700 10px/1 var(--mono); text-transform: uppercase; letter-spacing: .06em; }
.review-form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; background: #fbfaf7; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.review-form label { display: grid; gap: 8px; font-weight: 720; color: var(--graphite); font-size: 14px; }
.review-form input, .review-form select, .review-form textarea { width: 100%; border: 1px solid var(--line-strong); border-radius: 9px; padding: 13px; font: inherit; color: var(--graphite); background: #fff; }
.review-form input:focus, .review-form select:focus, .review-form textarea:focus { border-color: var(--blue); }
.review-form .full-span, .review-form textarea, .review-form button { grid-column: 1 / -1; }
.review-form button { border: 0; border-radius: 999px; padding: 14px 20px; background: var(--graphite); color: var(--white); font-weight: 780; cursor: pointer; }
.review-form button:hover { background: #000; }
.hidden { position: absolute; left: -9999px; height: 1px; width: 1px; overflow: hidden; }
.boundary-section { padding: 35px 0 72px; background: var(--white); }
.boundary-note { background: #fbfaf7; border: 1px solid var(--line); border-left: 4px solid var(--blue); border-radius: 9px; padding: 19px; color: var(--slate); line-height: 1.6; }

/* Existing-page compatibility */
.grid { display: grid; gap: 15px; }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.four { grid-template-columns: repeat(4, 1fr); }
.card { background: rgba(255,255,255,.82); border: 1px solid var(--line); border-radius: var(--radius); padding: 25px; box-shadow: 0 14px 48px rgba(16,24,32,.05); }
.card.dark { color: var(--white); background: var(--dark); border-color: rgba(255,255,255,.1); }
.card h3 { margin: 0 0 10px; font-size: 21px; }
.card p, .card li { color: var(--slate); line-height: 1.6; }
.card.dark p, .card.dark li { color: #b8c2d1; }
.card p { margin-bottom: 0; }
.card ul { margin: 10px 0 0; padding-left: 18px; }
.technical-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 24px; align-items: start; }
.code-panel { background: #0b1220; border: 1px solid rgba(255,255,255,.1); border-radius: var(--radius); padding: 22px; overflow: auto; color: #d7e2f0; font: 500 13px/1.7 var(--mono); }
.code-panel .muted { color: #718096; }
.code-panel .accent { color: #7dd3c0; }
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.flow-step { min-height: 118px; padding: 18px; border-radius: 9px; background: var(--white); border: 1px solid var(--line); }
.flow-step strong { display: block; margin-bottom: 8px; }
.flow-step span { color: var(--slate); font-size: 14px; line-height: 1.45; }
.callout { border-left: 4px solid var(--blue); background: var(--white); border-radius: 9px; padding: 22px; box-shadow: 0 12px 42px rgba(16,24,32,.05); }
.callout p { margin: 0; color: var(--slate); line-height: 1.6; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 9px; background: var(--white); }
table { width: 100%; border-collapse: collapse; min-width: 720px; }
th, td { padding: 15px 16px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--graphite); font-size: 13px; text-transform: uppercase; letter-spacing: .08em; }
td { color: var(--slate); line-height: 1.48; }
tr:last-child td { border-bottom: 0; }
.schema-block, .review-flow { display: block; white-space: pre-wrap; color: #d7fbe8; background: var(--dark); border: 1px solid rgba(255,255,255,.16); border-radius: var(--radius); padding: 22px; overflow-x: auto; font-family: var(--mono); line-height: 1.6; letter-spacing: 0; }
.cta-band { display: flex; align-items: center; justify-content: space-between; gap: 20px; background: var(--graphite); color: var(--white); border-radius: var(--radius); padding: 28px; }
.cta-band h2 { margin: 0; color: var(--white); }
.check-list { color: var(--slate); line-height: 1.75; }
.roadmap-gate-table th, .roadmap-gate-table td { vertical-align: top; }

.page-hero { min-height: 430px; }
.page-hero .hero-content { max-width: 900px; }
.prose { max-width: 780px; color: var(--slate); font-size: 18px; line-height: 1.72; }
.prose h2, .prose h3 { color: var(--graphite); }
.prose h2 { margin-top: 56px; }
.prose h3 { margin-top: 34px; }
.prose a { color: var(--blue); }
.principles-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; }
.principle { padding: 24px; border: 1px solid var(--line); background: var(--white); border-radius: var(--radius); }
.principle h3 { margin: 0 0 9px; }
.principle p { margin: 0; color: var(--slate); line-height: 1.6; }

.footer { padding: 54px 0 28px; border-top: 1px solid var(--line); color: var(--mist); background: #eeece6; }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 38px; }
.footer-grid > div { display: grid; align-content: start; gap: 10px; }
.footer-grid b { color: var(--graphite); font-size: 13px; margin-bottom: 4px; }
.footer-grid a { color: var(--slate); text-decoration: none; font-size: 14px; }
.footer-grid a:hover { color: var(--blue); }
.footer-brand strong { color: var(--graphite); font-size: 18px; }
.footer-brand p { max-width: 300px; line-height: 1.55; }
.footer-bottom { margin-top: 42px; padding-top: 20px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 20px; font-size: 12px; }
.footer-inner { display: flex; justify-content: space-between; gap: 28px; }
.footer-inner p { margin: 10px 0 0; max-width: 680px; line-height: 1.55; }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; align-content: flex-start; }
.footer-links a { color: var(--slate); font-weight: 650; text-decoration: none; }
.footer-links a:hover { color: var(--blue); }

@media (max-width: 1050px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-copy { max-width: 820px; }
  .proof-window { max-width: 760px; }
  .audience-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .architecture-grid { grid-template-columns: 1fr; }
  .architecture-card { min-height: 260px; }
  .architecture-card h3 { margin-top: 40px; }
  .evidence-layout, .review-layout { grid-template-columns: 1fr; }
  .manifest-card { max-width: 760px; }
  .footer-grid { grid-template-columns: 1.4fr repeat(3, 1fr); }
}

@media (max-width: 900px) {
  .status-grid, .grid.four, .flow { grid-template-columns: repeat(2, 1fr); }
  .grid.three, .technical-grid { grid-template-columns: 1fr; }
  .split-head, .stack-layout { grid-template-columns: 1fr; gap: 25px; }
  .problem-grid { grid-template-columns: 1fr; }
  .problem-card { min-height: auto; }
  .problem-card h3 { margin-top: 38px; }
  .engine-rail { grid-template-columns: auto 1fr; }
  .engine-rail p { grid-column: 1 / -1; margin: 4px 0 0; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .principles-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .nav { display: grid; grid-template-columns: 1fr; gap: 10px; padding: 11px 18px 10px; }
  .brand img { width: 30px; height: 30px; }
  .nav-links { width: 100%; overflow-x: auto; gap: 10px; padding: 1px 0 4px; scrollbar-width: thin; }
  .nav-links a { display: inline-flex; flex: 0 0 auto; padding: 7px 10px; border: 1px solid transparent; border-radius: 999px; font-size: 12px; background: rgba(255,255,255,.55); }
  .nav-links a[aria-current="page"] { border-color: rgba(49,92,255,.24); }
  .nav-cta { border-color: var(--line-strong) !important; }
  section { padding: 62px 0; }
  .proof-hero { min-height: auto; }
  .hero-grid { padding-top: 52px; padding-bottom: 84px; }
  h1, .page-title { font-size: clamp(43px, 13vw, 64px); }
  h2 { font-size: clamp(32px, 10vw, 48px); }
  .status-grid, .grid.two, .grid.four, .flow, .review-form { grid-template-columns: 1fr; }
  .review-form .full-span, .review-form textarea, .review-form button { grid-column: auto; }
  .audience-grid, .artifact-grid, .outcome-grid { grid-template-columns: 1fr; }
  .audience-card { min-height: auto; }
  .evidence-layout { gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { display: grid; }
  .footer-inner { display: block; }
  .footer-links { margin-top: 22px; }
  .cta-band { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 520px) {
  .wrap { padding: 0 18px; }
  .button-row { display: grid; }
  .button { width: 100%; }
  .proof-window { border-radius: 12px; }
  .proof-result { align-items: flex-start; }
  .status-strip { margin-top: -28px; }
  .status-grid { padding: 8px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: auto; }
}

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