:root {
  --ink: #0b1715;
  --muted: #55625f;
  --paper: #f4f4ec;
  --panel: #fbfbf6;
  --line: #cbd2c9;
  --green: #17c77b;
  --green-dark: #08724a;
  --red: #df4d44;
  --yellow: #e6c85b;
  --mono: "SFMono-Regular", "Cascadia Code", "Liberation Mono", monospace;
  --sans: "Avenir Next", "Helvetica Neue", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(11, 23, 21, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 23, 21, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 32px 32px;
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

.page-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 84px;
  border-bottom: 1px solid rgba(11, 23, 21, 0.18);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 9px;
  color: #fff;
  background: var(--ink);
  font: 800 12px/1 var(--mono);
}

.brand-name {
  font-size: 20px;
  font-weight: 750;
  letter-spacing: -0.03em;
}

.brand-by {
  color: var(--muted);
  font: 600 11px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.network-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(251, 251, 246, 0.7);
  font: 700 11px/1 var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.network-pill span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(23, 199, 123, 0.13);
}

.hero {
  padding: 92px 0 78px;
}

.eyebrow {
  color: var(--green-dark);
  font: 800 11px/1.3 var(--mono);
  letter-spacing: 0.14em;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 950px;
  margin: 22px 0 28px;
  font-size: clamp(54px, 9vw, 108px);
  line-height: 0.91;
  letter-spacing: -0.075em;
}

h1 em {
  color: var(--green-dark);
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  letter-spacing: -0.06em;
}

.hero-copy {
  max-width: 670px;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.5;
  letter-spacing: -0.02em;
}

.hero-actions,
.console-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid var(--ink);
  border-radius: 7px;
  cursor: pointer;
  font: 750 14px/1 var(--sans);
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 0 rgba(11, 23, 21, 0.11);
}

.button-primary {
  color: #fff;
  background: var(--ink);
}

.button-secondary {
  background: var(--panel);
}

.receipt-card,
.reverify {
  overflow: hidden;
  border: 1px solid var(--ink);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: 12px 12px 0 rgba(11, 23, 21, 0.08);
}

.receipt-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 34px 36px;
  border-bottom: 1px solid var(--line);
}

.receipt-head h2,
.reverify h2 {
  margin: 8px 0 0;
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1;
  letter-spacing: -0.055em;
}

.global-status {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-width: 138px;
  justify-content: center;
  padding: 12px 16px;
  border-radius: 6px;
  color: #fff;
  background: var(--green-dark);
  font: 850 12px/1 var(--mono);
  letter-spacing: 0.08em;
}

.global-status.is-loading {
  color: var(--ink);
  background: var(--yellow);
}

.global-status.is-invalid {
  background: var(--red);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}

.session-strip {
  display: grid;
  grid-template-columns: 1.25fr 1fr 1fr 0.6fr;
  border-bottom: 1px solid var(--line);
}

.session-strip div {
  min-width: 0;
  padding: 22px 26px;
  border-right: 1px solid var(--line);
}

.session-strip div:last-child {
  border-right: 0;
}

.session-strip span,
.proof-item h3,
.console-topbar,
.principles span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font: 750 10px/1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.session-strip strong {
  display: block;
  overflow: hidden;
  font-size: 15px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--line);
}

.proof-item {
  display: grid;
  min-width: 0;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 28px 26px;
  border-right: 1px solid var(--line);
}

.proof-item:last-child {
  border-right: 0;
}

.proof-index {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font: 800 10px/1 var(--mono);
}

.proof-item p {
  margin-bottom: 9px;
  font-size: 14px;
  line-height: 1.4;
}

.proof-item code,
.proof-item a {
  display: block;
  overflow: hidden;
  color: var(--green-dark);
  font: 700 11px/1.4 var(--mono);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.timeline-section {
  padding: 36px;
}

.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 30px;
}

.section-heading h3 {
  margin: 8px 0 0;
  font-size: 28px;
  letter-spacing: -0.04em;
}

.section-heading p {
  max-width: 420px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.timeline li {
  display: grid;
  grid-template-columns: 46px 130px 1fr auto;
  gap: 18px;
  align-items: center;
  min-height: 72px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.timeline-sequence {
  color: var(--muted);
  font: 700 11px/1 var(--mono);
}

.event-type {
  display: inline-flex;
  width: fit-content;
  padding: 7px 9px;
  border-radius: 4px;
  color: #fff;
  background: var(--ink);
  font: 800 10px/1 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.event-type.file-change {
  color: var(--ink);
  background: var(--green);
}

.event-summary strong {
  display: block;
  margin-bottom: 4px;
  font-size: 14px;
}

.event-summary code,
.event-hash {
  color: var(--muted);
  font: 11px/1.4 var(--mono);
}

.event-hash {
  text-align: right;
}

.receipt-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 36px;
  color: var(--muted);
  background: #edf0e8;
  font: 700 11px/1 var(--mono);
  letter-spacing: 0.04em;
}

.text-link {
  color: var(--ink);
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0;
}

.reverify {
  margin-top: 80px;
  padding: 48px;
  color: #f7f9f2;
  background: var(--ink);
  box-shadow: 12px 12px 0 rgba(23, 199, 123, 0.25);
}

.reverify .eyebrow {
  color: var(--green);
}

.reverify-intro {
  max-width: 780px;
}

.reverify-intro p {
  max-width: 680px;
  margin: 22px 0 0;
  color: #aab7b2;
  font-size: 18px;
  line-height: 1.55;
}

.test-layout {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 42px;
  margin-top: 48px;
}

.test-steps {
  display: grid;
  align-content: start;
  gap: 0;
}

.step {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid #35433f;
}

.step span {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid #71807b;
  border-radius: 50%;
  font: 700 11px/1 var(--mono);
}

.step p {
  margin: 4px 0 0;
  color: #aab7b2;
  font-size: 14px;
  line-height: 1.55;
}

.step strong {
  color: #fff;
}

.test-console {
  overflow: hidden;
  border: 1px solid #4b5a55;
  border-radius: 12px;
  background: #111f1c;
}

.console-topbar {
  display: flex;
  justify-content: space-between;
  margin: 0;
  padding: 15px 18px;
  color: #aab7b2;
  border-bottom: 1px solid #35433f;
}

.privacy-label {
  color: var(--green);
}

.console-result {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  align-items: center;
  min-height: 150px;
  padding: 28px;
  border-bottom: 1px solid #35433f;
}

.result-symbol {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border: 1px solid #63716d;
  border-radius: 50%;
  color: #aab7b2;
  font: 800 24px/1 var(--mono);
}

.console-result h3 {
  margin-bottom: 7px;
  font-size: 22px;
  letter-spacing: -0.035em;
}

.console-result p {
  margin-bottom: 0;
  color: #aab7b2;
  font-size: 14px;
  line-height: 1.45;
}

.console-result.is-match .result-symbol {
  color: var(--ink);
  border-color: var(--green);
  background: var(--green);
}

.console-result.is-mismatch .result-symbol {
  color: #fff;
  border-color: var(--red);
  background: var(--red);
}

.file-results {
  margin: 0;
  padding: 0 28px;
  list-style: none;
}

.file-results li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid #35433f;
  font: 700 12px/1.4 var(--mono);
}

.file-results .match {
  color: var(--green);
}

.file-results .mismatch,
.file-results .missing {
  color: #ff7f77;
}

.console-actions {
  padding: 22px 28px 28px;
  margin-top: 0;
}

.console-actions .button {
  flex: 1 1 210px;
}

.test-console .button-secondary {
  color: #fff;
  border-color: #63716d;
  background: transparent;
}

.test-console .button-primary {
  color: var(--ink);
  border-color: var(--green);
  background: var(--green);
}

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 80px 0;
  border: 1px solid var(--ink);
  background: var(--ink);
}

.principles article {
  padding: 32px;
  background: var(--panel);
}

.principles h3 {
  margin: 20px 0 12px;
  font-size: 22px;
  letter-spacing: -0.035em;
}

.principles p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 0 42px;
  border-top: 1px solid rgba(11, 23, 21, 0.18);
  color: var(--muted);
  font: 700 10px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 860px) {
  .session-strip,
  .proof-grid,
  .principles,
  .test-layout {
    grid-template-columns: 1fr;
  }

  .session-strip div,
  .proof-item {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .session-strip div:last-child,
  .proof-item:last-child {
    border-bottom: 0;
  }

  .timeline li {
    grid-template-columns: 38px 100px 1fr;
  }

  .event-hash {
    display: none;
  }
}

@media (max-width: 620px) {
  .page-shell {
    width: min(100% - 24px, 1180px);
  }

  .site-header {
    min-height: 68px;
  }

  .brand-by {
    display: none;
  }

  .network-pill {
    padding: 8px 10px;
    font-size: 9px;
  }

  .hero {
    padding: 62px 0 52px;
  }

  h1 {
    font-size: clamp(48px, 17vw, 76px);
  }

  .hero-actions,
  .hero-actions .button {
    width: 100%;
  }

  .receipt-head,
  .section-heading,
  .receipt-footer,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .receipt-head,
  .timeline-section,
  .reverify {
    padding: 26px 22px;
  }

  .global-status {
    width: 100%;
  }

  .session-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .session-strip div:nth-child(odd) {
    border-right: 1px solid var(--line);
  }

  .session-strip div:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  .proof-item {
    padding: 24px 22px;
  }

  .section-heading {
    align-items: flex-start;
  }

  .timeline li {
    grid-template-columns: 30px 1fr;
    gap: 10px;
  }

  .event-type {
    grid-column: 2;
  }

  .event-summary {
    grid-column: 2;
  }

  .receipt-footer {
    padding: 20px 22px;
  }

  .reverify {
    margin-top: 54px;
  }

  .console-result {
    grid-template-columns: 44px 1fr;
    padding: 22px 18px;
  }

  .result-symbol {
    width: 42px;
    height: 42px;
  }

  .file-results,
  .console-actions {
    padding-right: 18px;
    padding-left: 18px;
  }

  .principles {
    margin: 54px 0;
  }
}

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

  .button {
    transition: none;
  }
}