:root {
  --ink: #0b0f0d;
  --ink-2: #151b17;
  --paper: #f2f4ed;
  --paper-2: #fbfcf7;
  --line: #555f57;
  --line-soft: #a8afa8;
  --muted: #667068;
  --acid: #c8ff4a;
  --cyan: #59dfe2;
  --coral: #ff7868;
  --yellow: #f2d75b;
  --blue: #7795ed;
  --max: 1380px;
  --mono: Consolas, "SFMono-Regular", "Liberation Mono", monospace;
  --sans: Inter, "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--ink); color: var(--paper); font-family: var(--sans); letter-spacing: 0; }
button, input, select { font: inherit; letter-spacing: 0; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible { outline: 2px solid var(--yellow); outline-offset: 3px; }
[hidden] { display: none !important; }

.skip-link { position: fixed; z-index: 100; top: 8px; left: 12px; padding: 10px 14px; transform: translateY(-160%); background: var(--yellow); color: var(--ink); font: 800 11px/1 var(--mono); }
.skip-link:focus { transform: none; }
.topbar { position: sticky; z-index: 50; top: 0; height: 56px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 20px; padding: 0 max(20px, calc((100vw - var(--max)) / 2)); border-bottom: 1px solid #465048; background: rgba(11, 15, 13, .97); backdrop-filter: blur(10px); }
.brand { display: inline-flex; align-items: center; gap: 10px; width: max-content; text-decoration: none; font: 800 10px/1 var(--mono); }
.brand b { display: grid; width: 34px; height: 30px; place-items: center; border: 1px solid var(--acid); color: var(--acid); }
.topbar nav { display: flex; align-items: center; gap: 6px; }
.topbar nav a { min-height: 32px; display: flex; align-items: center; padding: 0 10px; border: 1px solid #4c554e; color: #b9c1ba; text-decoration: none; font: 800 9px/1 var(--mono); }
.topbar nav a:hover { border-color: var(--cyan); color: var(--cyan); }

.hero { border-bottom: 1px solid var(--line); }
.hero__grid { width: min(var(--max), calc(100% - 48px)); min-height: 540px; display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(320px, .7fr); gap: 70px; align-items: end; margin: auto; padding: 78px 0 64px; }
.kicker { margin: 0 0 14px; color: var(--acid); font: 800 10px/1.4 var(--mono); }
.hero h1 { max-width: 900px; margin: 0; color: #f8faf4; font: 800 clamp(50px, 6.5rem, 104px)/.9 var(--sans); letter-spacing: 0; overflow-wrap: anywhere; }
.hero__intro { max-width: 790px; margin: 28px 0 0; color: #b8c0ba; font-size: 17px; line-height: 1.65; }
.hero__signal { border-top: 1px solid var(--coral); }
.hero__signal p { min-height: 76px; display: grid; grid-template-columns: 38px 1fr; gap: 14px; align-items: center; margin: 0; border-bottom: 1px solid #465048; }
.hero__signal span { color: var(--coral); font: 800 10px/1 var(--mono); }
.hero__signal strong { color: #e6eae4; font-size: 13px; line-height: 1.4; }
.hero__rail { min-height: 54px; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid #303832; }
.hero__rail span { min-width: 0; display: flex; align-items: center; padding: 0 max(16px, calc((100vw - var(--max)) / 8)); border-right: 1px solid #303832; color: #8f9991; font: 800 9px/1.4 var(--mono); overflow-wrap: anywhere; }
.hero__rail span:last-child { border-right: 0; }

.gate { background: var(--paper); color: var(--ink); border-bottom: 1px solid var(--line); }
.gate__inner, .result__inner, .monitor__inner, .boundary__inner { width: min(var(--max), calc(100% - 48px)); margin: auto; padding: 82px 0; }
.section-heading { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, .55fr); gap: 70px; align-items: end; padding-bottom: 26px; border-bottom: 1px solid var(--line); }
.section-heading .kicker { color: #08777a; }
.section-heading h2, .result__header h2, .monitor h2, .boundary h2 { margin: 0; font-size: 42px; line-height: 1.05; overflow-wrap: anywhere; }
.section-heading > p { margin: 0; color: #475149; font-size: 13px; line-height: 1.65; }

.registry-form { padding: 34px 0 24px; border-bottom: 1px solid var(--line); }
.registry-form > label { display: flex; justify-content: space-between; gap: 20px; margin-bottom: 10px; font: 800 10px/1 var(--mono); }
.registry-form > label small { color: var(--muted); font: inherit; }
.registry-form__control { display: grid; grid-template-columns: minmax(260px, 1fr) auto auto; gap: 8px; }
.registry-form input { min-width: 0; height: 58px; padding: 0 18px; border: 1px solid var(--ink); border-radius: 0; background: var(--paper-2); color: var(--ink); font: 800 16px/1 var(--mono); }
.registry-form input::placeholder { color: #929a93; }
.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 0 17px; border: 1px solid var(--ink); border-radius: 0; background: transparent; color: var(--ink); cursor: pointer; text-decoration: none; font: 800 10px/1.2 var(--mono); }
.button:hover { background: var(--ink); color: var(--paper); }
.button:disabled { cursor: not-allowed; opacity: .45; }
.button--primary { min-height: 58px; background: var(--ink); color: var(--acid); }
.button--primary:hover { background: #263027; }
.field-error { min-height: 18px; margin: 8px 0 0; color: #a52e23; font: 800 10px/1.5 var(--mono); }
.status { min-height: 58px; display: grid; grid-template-columns: 12px minmax(180px, .7fr) minmax(260px, 1.3fr); gap: 14px; align-items: center; padding: 0 16px; border-bottom: 1px solid var(--line); background: #e7eae2; }
.status__dot { width: 8px; height: 8px; border-radius: 50%; background: #8c958d; }
.status strong, .status small { font: 800 9px/1.45 var(--mono); overflow-wrap: anywhere; }
.status small { color: var(--muted); }
.status.is-loading .status__dot { background: var(--yellow); animation: pulse 1s infinite alternate; }
.status.is-ready .status__dot { background: #2c9b72; }
.status.is-error .status__dot { background: var(--coral); }
@keyframes pulse { to { transform: scale(1.65); } }

.version-gate { padding-top: 44px; }
.version-gate > header { display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: end; }
.version-gate h3, .change-ledger h3, .receipt h3 { margin: 0; font-size: 26px; line-height: 1.1; }
.version-gate > header .kicker { color: #8a5e00; }
.version-gate > header > p { margin: 0; color: var(--muted); font: 800 10px/1.4 var(--mono); }
.version-gate__selectors { display: grid; grid-template-columns: minmax(0, 1fr) 40px minmax(0, 1fr) auto; gap: 12px; align-items: end; margin-top: 22px; }
.version-gate__selectors label { min-width: 0; display: grid; gap: 8px; color: var(--muted); font: 800 9px/1 var(--mono); }
.version-gate select { width: 100%; height: 54px; padding: 0 14px; border: 1px solid var(--ink); border-radius: 0; background: var(--paper-2); color: var(--ink); font: 800 13px/1 var(--mono); }
.version-arrow { height: 54px; display: grid; place-items: center; color: #08777a; font: 800 18px/1 var(--mono); pointer-events: none; }
.button--compare { position: relative; z-index: 1; min-height: 54px; border-color: #08777a; background: var(--cyan); scroll-margin-top: 72px; }

.result { background: var(--paper-2); color: var(--ink); border-bottom: 1px solid var(--line); }
.result__header { display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: end; padding-bottom: 26px; border-bottom: 1px solid var(--ink); }
.result__header .kicker { color: #08777a; }
.decision { min-width: 250px; padding: 15px 18px; border: 1px solid var(--ink); }
.decision span { display: block; color: var(--muted); font: 800 8px/1 var(--mono); }
.decision strong { display: block; margin-top: 8px; font: 800 15px/1.2 var(--mono); }
.decision[data-decision="review-required"] { border-color: #a52e23; background: #fff0ed; color: #92281e; }
.decision[data-decision="change-observed"] { border-color: #856400; background: #fff8dc; color: #745600; }
.decision[data-decision="no-observable-change"] { border-color: #1d7459; background: #e9f8f2; color: #17634b; }

.release-edge { display: grid; grid-template-columns: minmax(0, 1fr) 130px minmax(0, 1fr); gap: 20px; align-items: stretch; border-bottom: 1px solid var(--line); }
.release-edge article { min-width: 0; min-height: 160px; display: grid; grid-template-rows: auto 1fr auto auto; padding: 28px 0; }
.release-edge article > span { color: var(--muted); font: 800 9px/1 var(--mono); }
.release-edge article > strong { align-self: center; font: 800 42px/1 var(--mono); overflow-wrap: anywhere; }
.release-edge article small { color: var(--muted); font: 700 10px/1.4 var(--mono); }
.release-edge article code { margin-top: 7px; color: #08777a; font: 700 9px/1.4 var(--mono); overflow-wrap: anywhere; }
.release-edge > div { display: grid; grid-template-columns: 1fr auto 1fr; gap: 7px; align-items: center; pointer-events: none; }
.release-edge > div span { height: 1px; background: var(--line); }
.release-edge > div b { color: var(--coral); font: 800 16px/1 var(--mono); }

.summary-strip { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border-left: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.summary-strip > div { min-height: 110px; display: grid; align-content: space-between; padding: 18px; border-right: 1px solid var(--line); }
.summary-strip span { color: var(--muted); font: 800 8px/1.3 var(--mono); }
.summary-strip strong { font: 800 34px/1 var(--mono); }
.summary-strip__critical { background: #fff0ed; color: #9c2e23; }
.summary-strip__high { background: #fff5e4; color: #925319; }
.summary-strip__medium { background: #fff9dc; color: #765a00; }
.summary-strip__info { background: #edf4ff; color: #2d529d; }

.change-ledger { margin-top: 62px; }
.change-ledger > header { display: grid; grid-template-columns: 1fr minmax(280px, .55fr); gap: 40px; align-items: end; padding-bottom: 20px; border-bottom: 1px solid var(--ink); }
.change-ledger .kicker { color: #08777a; }
.change-ledger > header > p { margin: 0; color: var(--muted); font: 700 10px/1.5 var(--mono); }
.change-ledger__head, .change-row { display: grid; grid-template-columns: 110px minmax(150px, .55fr) minmax(260px, 1fr) 90px; gap: 18px; align-items: center; }
.change-ledger__head { min-height: 42px; border-bottom: 1px solid var(--line); color: var(--muted); font: 800 8px/1 var(--mono); }
.change-row { min-height: 88px; border-bottom: 1px solid var(--line-soft); }
.change-row > * { min-width: 0; }
.change-row__severity { width: max-content; padding: 7px 8px; border: 1px solid currentColor; font: 800 8px/1 var(--mono); }
.change-row[data-severity="critical"] .change-row__severity { color: #9c2e23; }
.change-row[data-severity="high"] .change-row__severity { color: #925319; }
.change-row[data-severity="medium"] .change-row__severity { color: #765a00; }
.change-row[data-severity="info"] .change-row__severity { color: #2d529d; }
.change-row__field { font: 800 10px/1.45 var(--mono); overflow-wrap: anywhere; }
.change-row__evidence strong { display: block; margin-bottom: 5px; font-size: 12px; }
.change-row__evidence code { display: block; color: var(--muted); font: 700 9px/1.45 var(--mono); overflow-wrap: anywhere; }
.change-row__type { justify-self: end; color: var(--muted); font: 800 9px/1 var(--mono); }
.empty-ledger { margin: 0; padding: 32px 0; border-bottom: 1px solid var(--line); color: #17634b; font: 800 11px/1.5 var(--mono); }

.receipt { display: grid; grid-template-columns: minmax(280px, .85fr) minmax(260px, 1.15fr); gap: 42px; margin-top: 62px; padding: 30px; border: 1px solid var(--ink); background: var(--ink); color: var(--paper); }
.receipt .kicker { color: var(--acid); }
.receipt p:not(.kicker) { margin: 13px 0 0; color: #aeb7b0; font-size: 12px; line-height: 1.6; }
.receipt > code { align-self: center; padding: 20px; border: 1px solid #4d5750; color: var(--cyan); font: 800 11px/1.6 var(--mono); overflow-wrap: anywhere; }
.receipt__actions { grid-column: 1/-1; display: flex; flex-wrap: wrap; gap: 8px; padding-top: 22px; border-top: 1px solid #4d5750; }
.receipt .button { border-color: #69746c; color: var(--paper); }
.receipt .button:hover { border-color: var(--acid); color: var(--acid); }

.monitor { background: var(--coral); color: #1b1210; border-bottom: 1px solid #772d27; }
.monitor__inner { display: grid; grid-template-columns: minmax(260px, .75fr) minmax(460px, 1.25fr); gap: 60px; }
.monitor .kicker { color: #681d17; }
.monitor__copy p:not(.kicker) { max-width: 600px; margin: 22px 0 0; color: #4d211c; font-size: 13px; line-height: 1.65; }
.monitor ol { list-style: none; margin: 0; padding: 0; border-top: 1px solid #772d27; }
.monitor li { min-height: 82px; display: grid; grid-template-columns: 42px 1fr auto; gap: 16px; align-items: center; border-bottom: 1px solid #772d27; }
.monitor li span, .monitor li small { font: 800 9px/1.4 var(--mono); }
.monitor li span { color: #681d17; }
.monitor li strong { font-size: 14px; }
.monitor li small { color: #5e2721; text-align: right; }
.monitor__actions { grid-column: 1/-1; display: flex; flex-wrap: wrap; gap: 8px; padding-top: 24px; border-top: 1px solid #772d27; }
.button--monitor { background: var(--ink); color: var(--acid); }

.boundary { background: #161b18; border-bottom: 1px solid var(--line); }
.boundary__inner > header { display: grid; grid-template-columns: minmax(0, .45fr) minmax(0, 1fr); gap: 60px; align-items: end; }
.boundary__inner > header .kicker { color: var(--yellow); }
.boundary__grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 42px; border-top: 1px solid #535d55; border-left: 1px solid #535d55; }
.boundary__grid article { min-height: 190px; padding: 24px; border-right: 1px solid #535d55; border-bottom: 1px solid #535d55; }
.boundary__grid span { color: var(--cyan); font: 800 9px/1 var(--mono); }
.boundary__grid p { margin: 46px 0 0; color: #b6beb7; font-size: 12px; line-height: 1.65; }
.source-line { margin: 22px 0 0; color: #909a92; font: 700 10px/1.6 var(--mono); }
.source-line span { padding: 0 8px; }
.source-line span:first-child { padding-left: 0; }
.source-line a:hover { color: var(--acid); }

.footer { width: min(var(--max), calc(100% - 48px)); min-height: 120px; display: grid; grid-template-columns: 1fr auto auto; gap: 36px; align-items: center; margin: auto; color: #aeb7b0; font: 800 9px/1.4 var(--mono); }
.footer > a { color: var(--acid); text-decoration: none; }
.footer nav { display: flex; gap: 16px; }
.footer nav a { text-decoration: none; }
.footer nav a:hover { color: var(--cyan); }
.noscript { margin: 0; padding: 18px; background: var(--yellow); color: var(--ink); text-align: center; font: 800 11px/1.4 var(--mono); }

@media (max-width: 1050px) {
  .hero__grid { min-height: 600px; grid-template-columns: 1fr; gap: 50px; align-items: start; }
  .hero__signal { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero__signal p { padding-right: 16px; }
  .section-heading { grid-template-columns: 1fr; gap: 18px; }
  .registry-form__control { grid-template-columns: 1fr auto; }
  .registry-form__control .button:last-child { grid-column: 1/-1; justify-self: start; }
  .version-gate__selectors { grid-template-columns: minmax(0, 1fr) 34px minmax(0, 1fr); }
  .button--compare { grid-column: 1/-1; }
  .monitor__inner { grid-template-columns: 1fr; gap: 34px; }
  .boundary__inner > header { grid-template-columns: 1fr; gap: 16px; }
}

@media (max-width: 720px) {
  .topbar { height: 52px; padding: 0 12px; }
  .topbar nav a { width: 34px; padding: 0; justify-content: center; font-size: 0; }
  .topbar nav a:nth-child(1)::after { content: "T"; font-size: 9px; }
  .topbar nav a:nth-child(2)::after { content: "O"; font-size: 9px; }
  .topbar nav a:nth-child(3), .topbar nav a:nth-child(4) { font-size: 9px; }
  .hero__grid, .gate__inner, .result__inner, .monitor__inner, .boundary__inner, .footer { width: calc(100% - 28px); }
  .hero__grid { min-height: 610px; padding: 58px 0 44px; }
  .hero h1 { font-size: 48px; line-height: .95; }
  .hero__intro { font-size: 14px; }
  .hero__signal { grid-template-columns: 1fr; }
  .hero__signal p { min-height: 58px; }
  .hero__rail { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero__rail span { min-height: 46px; padding: 0 14px; border-bottom: 1px solid #303832; }
  .hero__rail span:nth-child(2) { border-right: 0; }
  .gate__inner, .result__inner, .monitor__inner, .boundary__inner { padding: 58px 0; }
  .section-heading h2, .result__header h2, .monitor h2, .boundary h2 { font-size: 30px; }
  .registry-form__control { grid-template-columns: 1fr; }
  .registry-form input, .button--primary { height: 54px; min-height: 54px; }
  .registry-form__control .button:last-child { grid-column: auto; justify-self: stretch; }
  .status { min-height: 78px; grid-template-columns: 12px 1fr; padding: 12px; }
  .status small { grid-column: 2; }
  .version-gate > header { grid-template-columns: 1fr; gap: 12px; }
  .version-gate__selectors { grid-template-columns: 1fr; }
  .version-arrow { height: 30px; transform: rotate(90deg); }
  .result__header { grid-template-columns: 1fr; gap: 22px; }
  .decision { min-width: 0; }
  .release-edge { grid-template-columns: 1fr; }
  .release-edge article { min-height: 130px; }
  .release-edge > div { min-height: 32px; transform: rotate(90deg); }
  .summary-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .summary-strip > div:first-child { grid-column: 1/-1; }
  .change-ledger > header { grid-template-columns: 1fr; gap: 14px; }
  .change-ledger__head { display: none; }
  .change-row { grid-template-columns: auto 1fr; gap: 12px; padding: 18px 0; }
  .change-row__evidence { grid-column: 1/-1; }
  .change-row__type { grid-column: 2; grid-row: 1; }
  .change-row__field { grid-column: 1/-1; }
  .receipt { grid-template-columns: 1fr; gap: 24px; padding: 20px; }
  .receipt__actions { grid-column: auto; }
  .receipt .button { width: 100%; }
  .monitor li { grid-template-columns: 34px 1fr; }
  .monitor li small { grid-column: 2; text-align: left; }
  .monitor__actions .button { width: 100%; }
  .boundary__grid { grid-template-columns: 1fr; }
  .boundary__grid article { min-height: 145px; }
  .boundary__grid p { margin-top: 28px; }
  .footer { min-height: 160px; grid-template-columns: 1fr; gap: 14px; padding: 26px 0; }
  .footer nav { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .status.is-loading .status__dot { animation: none; }
}