:root {
  --ink: #1a1b1f;
  --muted: #3e3f42;
  --line: #1a1b1f;
  --soft-line: #d5d7d9;
  --paper: #ffffff;
  --wash: #f7f8f8;
  --mint: #d8fbf4;
  --mint-2: #edfffb;
  --green: #178229;
  --orange: #d96226;
  --blue: #0059b2;
  --mono: "iAWriterDuoS", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: Inter, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.48;
  background: var(--paper);
}

button,
input {
  font: inherit;
}

.site-header {
  width: min(980px, calc(100% - 40px));
  margin: 25px auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  color: var(--ink);
  font-family: var(--sans);
  font-size: 18px;
  font-weight: 800;
  text-decoration: none;
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-header nav a {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 14px;
  text-decoration: none;
}

.site-header nav a:hover {
  text-decoration: underline;
}

.nav-button {
  border: 1px solid var(--line);
  padding: 10px 15px;
}

.shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 74px 0 80px;
}

.intro {
  display: grid;
  gap: 42px;
  justify-items: center;
  text-align: center;
}

.intro-copy {
  max-width: 850px;
}

.eyebrow,
.panel-kicker {
  margin: 0 0 18px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 400;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1,
h2,
h3 {
  font-family: var(--sans);
  letter-spacing: 0;
}

h1 {
  max-width: 820px;
  margin: 0 auto;
  font-size: clamp(2.35rem, 4.8vw, 3.75rem);
  font-weight: 800;
  line-height: 1.12;
}

h2 {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: clamp(1.55rem, 2.4vw, 2.15rem);
  font-weight: 800;
  line-height: 1.16;
}

h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 1.28rem;
  font-weight: 800;
  line-height: 1.2;
}

.plain-note {
  max-width: 720px;
  margin: 22px auto 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.5;
}

.lookup {
  max-width: 720px;
  margin: 36px auto 0;
  text-align: left;
}

.lookup label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 13px;
}

.lookup-row {
  display: flex;
  min-height: 58px;
  border: 1px solid var(--line);
  background: var(--paper);
}

.lookup input {
  min-width: 0;
  flex: 1;
  border: 0;
  background: transparent;
  padding: 0 16px;
  color: var(--ink);
  outline: none;
}

.lookup input:focus {
  box-shadow: inset 0 0 0 2px var(--mint);
}

.lookup button {
  border: 0;
  border-left: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  padding: 0 22px;
  font-family: var(--mono);
  cursor: pointer;
}

.lookup button:hover {
  background: var(--mint);
  text-decoration: underline;
}

.plate {
  width: min(100%, 1020px);
  margin: 34px auto 8px;
}

.proof-map {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  align-items: stretch;
  border: 1px solid var(--line);
  background: var(--paper);
}

.proof-node {
  position: relative;
  min-width: 0;
  min-height: 144px;
  display: grid;
  align-content: center;
  gap: 8px;
  padding: 22px 18px;
  border-right: 1px solid var(--line);
  text-align: left;
}

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

.sct-node,
.path-node-hero {
  background: var(--mint-2);
}

.leaf-node {
  background: var(--mint);
}

.root-node {
  background: linear-gradient(180deg, var(--mint) 0 50%, var(--paper) 50% 100%);
}

.node-kicker,
.proof-node small {
  font-family: var(--mono);
}

.node-kicker {
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
}

.proof-node strong {
  color: var(--ink);
  font-family: var(--sans);
  font-size: 20px;
  line-height: 1.08;
}

.proof-node small {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.35;
}

.status-band {
  position: sticky;
  top: 14px;
  z-index: 10;
  max-width: 980px;
  margin: 32px auto 58px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  padding: 13px 16px;
  font-size: 14px;
  text-align: left;
}

.status-band::before {
  content: "";
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 10px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--mint);
}

.grid {
  display: grid;
  gap: 54px;
}

.panel {
  position: relative;
  max-width: 980px;
  width: 100%;
  margin: 0 auto;
  padding: 0 0 44px 110px;
  border-bottom: 1px solid var(--soft-line);
  background: transparent;
}

.panel::before {
  content: var(--step);
  position: absolute;
  left: 0;
  top: 0;
  width: 72px;
  height: 72px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  background: var(--mint);
  font-family: var(--sans);
  font-size: 32px;
  font-weight: 800;
}

.wide {
  grid-column: auto;
}

.empty {
  color: var(--muted);
  font-size: 16px;
}

.section-copy {
  max-width: 820px;
  margin: -6px 0 10px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.55;
}

.resource-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 18px;
}

.resource-row a {
  display: inline-block;
  border: 1px solid var(--line);
  background: var(--mint-2);
  color: var(--ink);
  padding: 8px 10px;
  font-family: var(--mono);
  font-size: 12px;
  text-decoration: none;
}

.resource-row a:hover {
  background: var(--mint);
  text-decoration: underline;
}

.facts {
  display: grid;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 8px 20px;
}

.fact {
  display: grid;
  grid-template-columns: minmax(140px, 0.28fr) minmax(0, 1fr);
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--soft-line);
}

.fact:last-child {
  border-bottom: 0;
}

.fact b,
.mini,
.badge,
.tree-caption,
.tree-node b,
.hash-transcript summary,
.root-check b,
.transcript-table {
  font-family: var(--mono);
}

.fact b {
  color: var(--muted);
  font-size: 12px;
  font-weight: 400;
  text-transform: uppercase;
}

.fact span {
  overflow-wrap: anywhere;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 14px;
}

.badge {
  border: 1px solid var(--line);
  background: var(--mint);
  padding: 7px 9px;
  color: var(--ink);
  font-size: 12px;
}

.badge.bad {
  background: #ffe7db;
}

.sct-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 20px;
}

.sct-card {
  min-width: 0;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 22px;
}

.sct-card:nth-child(2n) {
  background: var(--mint-2);
}

.mini {
  margin: 8px 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.proof-rail {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0;
  margin: 0 0 22px;
  border: 1px solid var(--line);
  border-right: 0;
}

.proof-rail span {
  min-height: 70px;
  display: grid;
  place-items: center;
  border-right: 1px solid var(--line);
  background: var(--paper);
  padding: 10px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  text-align: center;
}

.proof-rail span:nth-child(2n) {
  background: var(--mint-2);
}

.proof-list {
  display: grid;
  gap: 18px;
}

.proof-note {
  max-width: 820px;
  margin: 0;
  color: var(--muted);
}

.proof-item {
  position: relative;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 24px;
}

.proof-item::before {
  content: "";
  position: absolute;
  right: 22px;
  top: 22px;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--paper);
}

.proof-item.proven::before {
  background: var(--mint);
}

.proof-item.proven::after {
  content: "verified";
  position: absolute;
  right: 16px;
  top: 66px;
  color: var(--green);
  font-family: var(--mono);
  font-size: 11px;
}

.merkle-tree {
  position: relative;
  margin: 18px 0 16px;
  border: 1px solid var(--line);
  background: var(--wash);
  padding: 16px;
}

.tree-caption {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
  text-align: center;
}

.tree-root,
.tree-leaf {
  width: min(260px, 100%);
  margin: 0 auto;
}

.tree-root {
  background: var(--mint);
}

.tree-leaf {
  background: var(--paper);
}

.tree-scroll {
  position: relative;
  max-height: 720px;
  overflow: auto;
  padding: 12px 0;
}

.tree-scroll::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 24px;
  bottom: 24px;
  border-left: 1px solid rgba(26, 27, 31, 0.35);
  z-index: 0;
}

.tree-root,
.tree-leaf,
.tree-spine {
  position: relative;
  z-index: 1;
}

.tree-root::after,
.tree-leaf::before,
.tree-spine::before,
.tree-spine::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 0;
  border-left: 1px solid rgba(26, 27, 31, 0.35);
  transform: translateX(-50%);
  z-index: 0;
}

.tree-root::after {
  top: 100%;
  height: 18px;
}

.tree-leaf::before {
  bottom: 100%;
  height: 18px;
}

.tree-spine::before {
  bottom: 50%;
  height: 36px;
}

.tree-spine::after {
  top: 50%;
  height: 36px;
}

.tree-row {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(132px, 0.78fr) minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  min-height: 72px;
}

.tree-row::before,
.tree-row::after {
  content: "";
  position: absolute;
  top: 50%;
  height: 1px;
  border-top: 1px dashed var(--line);
  z-index: 0;
}

.tree-row.branch-left::before {
  left: 20%;
  right: 50%;
}

.tree-row.branch-left::after {
  display: none;
}

.tree-row.branch-right::after {
  left: 50%;
  right: 20%;
}

.tree-row.branch-right::before {
  display: none;
}

.tree-cell {
  position: relative;
  z-index: 1;
}

.tree-spine {
  display: grid;
  place-items: center;
}

.tree-node {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 6px;
  min-width: 0;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 10px;
  text-align: center;
}

.tree-node b {
  color: var(--muted);
  font-size: 11px;
  font-weight: 400;
}

.tree-node span {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.path-node {
  min-width: 132px;
  background: var(--paper);
}

.sibling-node {
  background: var(--mint-2);
}

.hash-transcript {
  margin: 16px 0;
  border: 1px solid var(--line);
  background: var(--paper);
}

.hash-transcript summary {
  cursor: pointer;
  padding: 12px 14px;
  background: var(--mint-2);
  color: var(--ink);
  font-size: 12px;
}

.hash-transcript summary:hover {
  text-decoration: underline;
}

.transcript-copy {
  padding: 14px 14px 0;
  color: var(--muted);
}

.root-check {
  display: grid;
  grid-template-columns: 118px minmax(0, 1fr);
  gap: 8px 12px;
  margin: 14px;
  padding: 12px;
  border: 1px solid var(--soft-line);
  background: var(--wash);
}

.root-check b {
  color: var(--muted);
  font-size: 11px;
  font-weight: 400;
}

.root-check code {
  overflow-wrap: anywhere;
  font-family: var(--mono);
  font-size: 12px;
}

.transcript-table-wrap {
  max-height: 520px;
  overflow: auto;
  margin: 14px;
  border: 1px solid var(--soft-line);
  background: var(--paper);
}

.transcript-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 11px;
}

.transcript-table th,
.transcript-table td {
  min-width: 220px;
  padding: 9px 10px;
  border-top: 1px solid var(--soft-line);
  border-left: 1px solid var(--soft-line);
  vertical-align: top;
  overflow-wrap: anywhere;
  text-align: left;
}

.transcript-table th:first-child,
.transcript-table td:first-child {
  min-width: 70px;
  border-left: 0;
}

.transcript-table thead th {
  position: sticky;
  top: 0;
  border-top: 0;
  background: var(--mint);
  color: var(--ink);
}

@media (max-width: 860px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-header nav {
    flex-wrap: wrap;
    gap: 14px 20px;
  }

  .shell {
    padding-top: 48px;
  }

  .panel {
    padding-left: 0;
    padding-top: 92px;
  }

  .panel::before {
    top: 0;
  }

  .proof-rail {
    grid-template-columns: 1fr;
    border-right: 1px solid var(--line);
    border-bottom: 0;
  }

  .proof-rail span {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .proof-map {
    grid-template-columns: 1fr;
  }

  .proof-node {
    min-height: 112px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .proof-node:last-child {
    border-bottom: 0;
  }

  .tree-row {
    grid-template-columns: minmax(0, 1fr) 104px minmax(0, 1fr);
    gap: 8px;
  }

  .tree-row.branch-left::before {
    left: 15%;
  }

  .tree-row.branch-right::after {
    right: 15%;
  }
}

@media (max-width: 620px) {
  body {
    background: var(--paper);
  }

  .site-header,
  .shell {
    width: min(100% - 24px, 1120px);
  }

  h1 {
    font-size: clamp(2.15rem, 9.5vw, 2.85rem);
  }

  .lookup-row {
    display: grid;
  }

  .lookup button {
    min-height: 52px;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .fact,
  .root-check {
    grid-template-columns: 1fr;
  }

  .merkle-tree {
    padding: 10px;
  }

  .tree-scroll {
    max-height: 620px;
  }

  .tree-row {
    grid-template-columns: minmax(0, 1fr) 86px minmax(0, 1fr);
    gap: 6px;
    min-height: 68px;
  }

  .tree-node {
    padding: 7px 5px;
  }

  .tree-node b,
  .tree-node span {
    font-size: 10px;
  }
}