:root {
  --color-primary: #0037d2;
  --color-on-primary: #ffffff;
  --color-secondary: #001f5c;
  --color-accent: #719fff;
  --color-dark-base: #000021;
  --color-on-dark-muted: #b6cef0;
  --color-surface: #ffffff;
  --color-surface-alt: #f5f8ff;
  --color-on-surface: #000021;
  --border-light: rgba(0, 0, 33, 0.12);
  --border-blue: rgba(0, 55, 210, 0.18);
  --font-heading: "Sora", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-on-surface);
  background:
    linear-gradient(90deg, rgba(0, 55, 210, 0.055) 1px, transparent 1px),
    linear-gradient(rgba(0, 55, 210, 0.045) 1px, transparent 1px),
    var(--color-surface);
  background-size: 48px 48px;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 18px 40px;
  border-bottom: 1px solid var(--border-light);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
}

.brand img {
  width: 128px;
}

.site-header p {
  margin: 0;
  color: rgba(0, 0, 33, 0.62);
  font-size: 14px;
  font-weight: 700;
}

.page-shell {
  display: grid;
  grid-template-columns: 248px minmax(0, 920px);
  gap: 48px;
  width: min(1260px, 100%);
  margin: 0 auto;
  padding: 54px 34px 88px;
}

.toc {
  position: sticky;
  top: 104px;
  align-self: start;
  display: grid;
  gap: 10px;
  padding: 18px 0;
}

.toc p {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
  color: var(--color-primary);
}

.toc a {
  display: block;
  padding: 7px 0;
  color: rgba(0, 0, 33, 0.66);
  font-size: 14px;
  font-weight: 700;
}

.case-study {
  border: 1px solid var(--border-light);
  border-radius: 8px;
  background: var(--color-surface);
  overflow: hidden;
  box-shadow: 0 18px 48px rgba(0, 0, 33, 0.08);
}

.article-hero {
  position: relative;
  padding: 70px 72px 58px;
  background: var(--color-dark-base);
  color: var(--color-on-primary);
  overflow: hidden;
}

.article-hero::after {
  content: "";
  position: absolute;
  right: -120px;
  bottom: -160px;
  width: 420px;
  height: 420px;
  border: 1px solid rgba(113, 159, 255, 0.34);
  transform: rotate(45deg);
}

.eyebrow {
  position: relative;
  z-index: 1;
  margin: 0 0 18px;
  color: var(--color-accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-heading);
  line-height: 1.08;
  letter-spacing: 0;
}

h1 {
  position: relative;
  z-index: 1;
  max-width: 760px;
  font-size: 58px;
  font-weight: 700;
}

h2 {
  margin-bottom: 22px;
  font-size: 34px;
  font-weight: 700;
  color: var(--color-secondary);
}

h3 {
  margin: 28px 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--color-secondary);
}

p,
li {
  font-size: 17px;
  line-height: 1.72;
}

p {
  margin: 0 0 18px;
}

ol,
ul {
  margin: 0 0 22px;
  padding-left: 24px;
}

li + li {
  margin-top: 8px;
}

.summary-callout {
  position: relative;
  z-index: 1;
  display: inline-grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 14px;
  margin-top: 34px;
  padding: 15px 18px;
  border: 1px solid rgba(113, 159, 255, 0.34);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
}

.summary-callout strong {
  font-family: var(--font-heading);
  font-size: 30px;
  color: var(--color-on-primary);
}

.summary-callout span {
  color: var(--color-on-dark-muted);
  font-size: 14px;
  font-weight: 700;
}

.content-section {
  padding: 58px 72px;
  border-top: 1px solid var(--border-light);
}

.content-section:nth-of-type(even) {
  background: var(--color-surface-alt);
}

.content-section > p,
.content-section > ol,
.content-section > ul,
.content-section > h3,
.spaced-list,
.requirement-list,
.diagram-block,
.screenshot {
  max-width: 760px;
}

.requirement-list {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.requirement-list section {
  padding: 20px 22px;
  border-left: 3px solid var(--color-primary);
  background: var(--color-surface);
}

.requirement-list h3 {
  margin-top: 0;
}

.requirement-list p {
  margin-bottom: 0;
}

.diagram-block {
  margin: 32px 0 34px;
  padding: 22px;
  border: 1px solid var(--border-blue);
  border-radius: 8px;
  background: var(--color-surface);
}

.diagram-block figcaption {
  margin-bottom: 18px;
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
}

.diagram {
  display: grid;
  gap: 12px;
}

.multisig-diagram {
  grid-template-columns: 1fr;
  gap: 16px;
}

.node,
.junction,
.public-node,
.cloud-component {
  min-height: 74px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 14px 16px;
  border: 1px solid rgba(0, 55, 210, 0.16);
  border-radius: 8px;
  background: #f9fbff;
  color: var(--color-secondary);
  font-weight: 700;
}

.node small,
.public-node small,
.cloud-component small {
  margin-top: 4px;
  color: rgba(0, 0, 33, 0.58);
  font-size: 12px;
  font-weight: 600;
}

.primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.primary small {
  color: rgba(255, 255, 255, 0.78);
}

.msig-group {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 36px 16px 16px;
  border: 1.5px dashed rgba(0, 55, 210, 0.36);
  border-radius: 8px;
  background: var(--color-surface-alt);
}

.threef-msig {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-color: rgba(0, 0, 33, 0.28);
  background: #ffffff;
}

.group-label {
  position: absolute;
  top: 12px;
  left: 16px;
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
}

.threef-msig .group-label {
  color: var(--color-secondary);
}

.connector-line {
  width: 1.5px;
  height: 30px;
  margin: -2px auto;
  background: repeating-linear-gradient(
    to bottom,
    rgba(0, 55, 210, 0.5),
    rgba(0, 55, 210, 0.5) 5px,
    transparent 5px,
    transparent 10px
  );
}

.junction {
  grid-column: 1 / -1;
  align-items: center;
  text-align: center;
  background: var(--color-surface-alt);
}

.wide,
.output {
  grid-column: 1 / -1;
}

.output {
  background: var(--color-dark-base);
  color: var(--color-on-primary);
}

.cloud-diagram {
  grid-template-columns: 1fr;
}

.private-zone {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 16px;
  border: 1px dashed rgba(0, 55, 210, 0.32);
  border-radius: 8px;
  background: var(--color-surface-alt);
}

.private-zone > span {
  grid-column: 1 / -1;
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
}

.cloud-component {
  min-height: 92px;
  gap: 5px;
  align-items: flex-start;
}

.cloud-component strong {
  font-size: 15px;
}

.icon-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 24px;
  padding: 0 8px;
  border-radius: 6px;
  background: rgba(0, 55, 210, 0.1);
  color: var(--color-primary);
  font-size: 11px;
  font-weight: 700;
}

.primary .icon-badge,
.output .icon-badge {
  background: rgba(255, 255, 255, 0.14);
  color: var(--color-on-primary);
}

.spaced-list > li {
  margin-top: 18px;
}

.spaced-list strong {
  display: block;
  color: var(--color-secondary);
  font-size: 17px;
}

.spaced-list p {
  margin: 6px 0 0;
}

.screenshot {
  margin: 30px 0 28px;
  padding: 10px;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  background: var(--color-surface);
  box-shadow: 0 14px 34px rgba(0, 0, 33, 0.12);
}

.screenshot img {
  border: 1px solid rgba(0, 0, 33, 0.1);
  border-radius: 6px;
}

.closing-section {
  background: var(--color-dark-base);
  color: var(--color-on-primary);
}

.closing-section h2 {
  color: var(--color-on-primary);
}

.closing-section p,
.closing-section li {
  color: rgba(255, 255, 255, 0.82);
}

.closing-section .last-line {
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--color-on-primary);
  font-weight: 700;
}

@media (max-width: 1080px) {
  .page-shell {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .toc {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    padding: 0;
  }

  .toc p {
    width: 100%;
  }
}

@media (max-width: 720px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    padding: 18px 22px;
  }

  .page-shell {
    padding: 28px 14px 54px;
  }

  .article-hero,
  .content-section {
    padding: 38px 24px;
  }

  h1 {
    font-size: 38px;
  }

  h2 {
    font-size: 28px;
  }

  p,
  li {
    font-size: 16px;
  }

  .summary-callout {
    grid-template-columns: 1fr;
  }

  .multisig-diagram,
  .private-zone,
  .msig-group,
  .threef-msig {
    grid-template-columns: 1fr;
  }
}