:root {
  color-scheme: light;
  --bg: #f6f7f5;
  --paper: #ffffff;
  --ink: #111613;
  --muted: #626a66;
  --line: #d8ddd8;
  --soft-line: #e7ebe7;
  --accent: #26b85a;
  --accent-dark: #0f7d3b;
  --panel: #121715;
  --panel-muted: #a9b4ad;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(90deg, rgba(17, 22, 19, 0.05) 1px, transparent 1px),
    linear-gradient(0deg, rgba(17, 22, 19, 0.04) 1px, transparent 1px),
    var(--bg);
  background-size: 56px 56px;
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 16px clamp(20px, 4vw, 56px);
  border-bottom: 1px solid var(--line);
  background: rgba(246, 247, 245, 0.92);
  backdrop-filter: blur(14px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 310px;
}

.brand-mark {
  width: 36px;
  height: 36px;
  flex: none;
  color: var(--ink);
  background: currentColor;
  -webkit-mask: url("./assets/acc-logo.svg") center / contain no-repeat;
  mask: url("./assets/acc-logo.svg") center / contain no-repeat;
}

.brand-copy {
  display: grid;
  gap: 1px;
}

.brand-copy strong {
  font-size: 15px;
  letter-spacing: 0;
}

.brand-copy span {
  color: var(--muted);
  font-size: 12px;
}

.top-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(18px, 3vw, 38px);
  min-width: 520px;
  color: #39403c;
  font-size: 14px;
  font-weight: 650;
}

.top-nav a {
  border-bottom: 2px solid transparent;
  padding: 6px 0;
}

.top-nav a:hover {
  border-color: var(--accent);
  color: var(--ink);
}

.top-nav a[aria-current="page"] {
  border-color: var(--ink);
  color: var(--ink);
}

.band {
  width: 100%;
}

.band-inner {
  width: 100%;
  max-width: 1640px;
  margin: 0 auto;
  padding-right: clamp(20px, 4vw, 72px);
  padding-left: clamp(20px, 4vw, 72px);
}

.hero {
  border-bottom: 1px solid var(--line);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(480px, 640px);
  gap: clamp(44px, 6vw, 112px);
  align-items: center;
  min-height: calc(100vh - 76px);
  padding-top: clamp(72px, 8vw, 118px);
  padding-bottom: 76px;
}

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

.eyebrow {
  margin: 0 0 16px;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 980px;
  margin-bottom: 24px;
  font-size: clamp(50px, 6.8vw, 106px);
  line-height: 0.96;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(34px, 4vw, 56px);
  line-height: 1.02;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.2;
}

.hero-lead {
  max-width: 760px;
  margin-bottom: 32px;
  color: #3f4642;
  font-size: clamp(20px, 1.55vw, 25px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  border: 1px solid var(--ink);
  padding: 11px 20px;
  font-size: 14px;
  font-weight: 800;
}

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

.button.secondary {
  background: transparent;
  color: var(--ink);
}

.button:hover {
  border-color: var(--accent-dark);
  color: var(--accent-dark);
}

.button.primary:hover {
  background: var(--accent-dark);
  color: #fff;
}

.principle {
  display: inline-block;
  margin: 0;
  border-left: 4px solid var(--accent);
  padding: 8px 0 8px 14px;
  color: #27302a;
  font-size: 15px;
  font-weight: 750;
}

.contract-visual {
  width: 100%;
  border: 1px solid #1f2823;
  background: var(--panel);
  color: #eef4ef;
  box-shadow: 18px 18px 0 rgba(17, 22, 19, 0.08);
}

.visual-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid #2f3933;
  padding: 16px 18px;
  color: var(--panel-muted);
  font-size: 13px;
  text-transform: uppercase;
}

.visual-header code {
  color: #75dd98;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  text-transform: none;
}

.visual-grid {
  display: grid;
  gap: 12px;
  padding: 18px;
}

.visual-node {
  border: 1px solid #3b453f;
  padding: 18px;
  background: #171d1a;
}

.visual-node.contract {
  border-color: var(--accent);
  background: #102216;
}

.node-label {
  display: block;
  margin-bottom: 10px;
  color: #75dd98;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.visual-node strong {
  display: block;
  margin-bottom: 4px;
  font-size: 21px;
}

.visual-node small {
  color: var(--panel-muted);
  font-size: 13px;
}

.visual-code {
  border-top: 1px solid #2f3933;
  padding: 18px;
  background: #0d1110;
}

pre {
  margin: 0;
  overflow: auto;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
  line-height: 1.65;
}

code {
  font-family: "SFMono-Regular", Consolas, monospace;
}

.section {
  border-bottom: 1px solid var(--line);
}

.section > .band-inner {
  padding-top: 76px;
  padding-bottom: 76px;
}

.compact > .band-inner {
  padding-top: 28px;
  padding-bottom: 42px;
}

.statement {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 24px 0;
}

.statement p {
  max-width: 1320px;
  margin: 0;
  color: #2c332f;
  font-size: clamp(24px, 2.6vw, 42px);
  line-height: 1.25;
  font-weight: 750;
}

.section-heading {
  max-width: 980px;
  margin-bottom: 34px;
}

.section-heading p:not(.eyebrow),
.split > div:first-child p {
  color: var(--muted);
  font-size: 18px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.feature {
  min-height: 220px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  padding: 24px;
}

.feature span {
  display: inline-block;
  margin-bottom: 34px;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 850;
}

.feature p {
  margin: 0;
  color: var(--muted);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(520px, 1.18fr);
  gap: clamp(40px, 6vw, 108px);
  align-items: start;
}

.code-panel {
  border: 1px solid #1f2823;
  background: #0d1110;
  color: #eef4ef;
}

.code-title {
  border-bottom: 1px solid #2f3933;
  padding: 14px 18px;
  color: #75dd98;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  font-weight: 800;
}

.code-panel pre {
  padding: 20px;
}

.implementations > .band-inner {
  padding-bottom: 100px;
}

.implementation-row {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 32px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 26px 0;
}

.implementation-name {
  display: grid;
  gap: 4px;
}

.implementation-name strong {
  font-size: 22px;
}

.implementation-name span {
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.implementation-row p {
  max-width: 760px;
  margin: 0;
  color: #424a45;
  font-size: 18px;
}

.page-hero {
  border-bottom: 1px solid var(--line);
}

.page-hero-inner {
  padding-top: clamp(86px, 10vw, 150px);
  padding-bottom: clamp(70px, 8vw, 118px);
}

.page-hero h1 {
  max-width: 1180px;
  margin-bottom: 24px;
  font-size: clamp(48px, 5.9vw, 96px);
}

.page-hero p:not(.eyebrow) {
  max-width: 850px;
  margin-bottom: 0;
  color: #3f4642;
  font-size: clamp(19px, 1.5vw, 24px);
}

.two-column {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: clamp(42px, 5vw, 92px);
  align-items: start;
}

.side-index {
  position: sticky;
  top: 110px;
  display: grid;
  gap: 8px;
  border-left: 1px solid var(--line);
  padding-left: 18px;
}

.side-index span {
  margin-bottom: 10px;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.12em;
}

.side-index a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.side-index a:hover {
  color: var(--ink);
}

.doc-flow {
  display: grid;
  gap: clamp(58px, 7vw, 100px);
}

.doc-block {
  max-width: 1180px;
  border-top: 1px solid var(--line);
  padding-top: 34px;
}

.doc-block > p:not(.eyebrow) {
  max-width: 860px;
  color: #424a45;
  font-size: 18px;
}

.scope-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 28px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.scope-list span {
  min-height: 88px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.66);
  padding: 18px;
  color: #303833;
  font-weight: 750;
}

.principle-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 30px;
  border: 1px solid var(--line);
}

.principle-panel div {
  min-height: 160px;
  padding: 26px;
}

.principle-panel div + div {
  border-left: 1px solid var(--line);
}

.principle-panel span {
  display: block;
  margin-bottom: 14px;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.principle-panel strong {
  display: block;
  font-size: clamp(28px, 3vw, 46px);
  line-height: 1.05;
}

.field-table {
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.field-row {
  display: grid;
  grid-template-columns: 180px minmax(0, 0.9fr) minmax(0, 1fr);
  border-bottom: 1px solid var(--line);
}

.field-row > * {
  min-width: 0;
  border-right: 1px solid var(--line);
  padding: 16px 18px;
}

.field-row.head {
  background: #ebefeb;
  color: #303833;
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.field-row code {
  color: var(--accent-dark);
  font-weight: 800;
  overflow-wrap: anywhere;
}

.example-stack {
  display: grid;
  gap: 34px;
}

.example-card {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(520px, 1.22fr);
  gap: clamp(34px, 5vw, 84px);
  align-items: start;
  border-top: 1px solid var(--line);
  padding-top: 34px;
}

.example-copy p:not(.eyebrow) {
  max-width: 620px;
  color: var(--muted);
  font-size: 18px;
}

.reference-panel {
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 36px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 30px 0;
}

.reference-panel strong {
  display: block;
  margin-bottom: 6px;
  font-size: clamp(30px, 3vw, 44px);
  line-height: 1.05;
}

.reference-panel span {
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.reference-panel p {
  max-width: 920px;
  margin: 0;
  color: #424a45;
  font-size: 18px;
}

.claim-grid,
.governance-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 34px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.claim-card,
.governance-card {
  min-height: 190px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  padding: 24px;
}

.claim-card span,
.governance-card span {
  display: block;
  margin-bottom: 24px;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 850;
  text-transform: uppercase;
}

.claim-card p,
.governance-card p {
  margin: 0;
  color: var(--muted);
}

.governance-grid {
  margin-top: 0;
}

.governance-card {
  min-height: 310px;
}

.governance-card h2 {
  font-size: clamp(28px, 2.8vw, 42px);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--line);
  padding: 28px clamp(20px, 4vw, 56px);
  color: var(--muted);
  font-size: 14px;
}

.site-footer a {
  color: var(--accent-dark);
  font-weight: 800;
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .brand,
  .top-nav {
    min-width: 0;
    width: 100%;
  }

  .top-nav {
    justify-content: space-between;
    gap: 12px;
    overflow-x: auto;
  }

  .hero-inner,
  .split,
  .two-column,
  .example-card,
  .reference-panel {
    grid-template-columns: 1fr;
  }

  .side-index {
    position: static;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-top: 16px;
    padding-left: 0;
  }

  .side-index span {
    grid-column: 1 / -1;
  }

  .hero-inner {
    min-height: 0;
  }

  .contract-visual {
    max-width: 620px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .scope-list,
  .claim-grid,
  .governance-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .field-row {
    grid-template-columns: 140px minmax(0, 1fr);
  }

  .field-row > *:nth-child(3) {
    grid-column: 1 / -1;
  }

  .implementation-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .site-header {
    position: static;
  }

  .hero {
    padding-top: 0;
  }

  .hero-inner {
    padding-top: 48px;
  }

  h1 {
    font-size: 44px;
  }

  .hero-lead {
    font-size: 17px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .page-hero h1 {
    font-size: 42px;
  }

  .side-index,
  .scope-list,
  .claim-grid,
  .governance-grid,
  .principle-panel {
    grid-template-columns: 1fr;
  }

  .principle-panel div + div {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .field-row {
    display: block;
  }

  .field-row > * {
    display: block;
    border-bottom: 1px solid var(--soft-line);
  }

  .field-row > *:last-child {
    border-bottom: 0;
  }

  .site-footer {
    flex-direction: column;
  }
}