:root {
  color-scheme: light;
  --ink: #16191d;
  --muted: #5d646d;
  --line: #dfe3e8;
  --soft: #f4f6f7;
  --white: #ffffff;
  --red: #e9284f;
  --red-dark: #bd1738;
  --teal: #087d76;
  --amber: #d98700;
  --code: #111418;
  --max: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

a { color: inherit; }

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

code { font-size: .92em; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: 64px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 10px max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: fit-content;
  font-weight: 760;
  text-decoration: none;
}

.brand img { border-radius: 6px; }

.topbar nav { display: flex; gap: 28px; }

.topbar nav a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.topbar nav a:hover { color: var(--ink); }

.topbar > .button { justify-self: end; }

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 720;
  text-decoration: none;
  transition: background .16s ease, border-color .16s ease, transform .16s ease;
}

.button:hover { transform: translateY(-1px); }
.button svg { width: 17px; height: 17px; }
.button-primary { color: var(--white); background: var(--red); }
.button-primary:hover { background: var(--red-dark); }
.button-secondary { border-color: #cfd4da; background: var(--white); }
.button-secondary:hover { border-color: #979fa8; }
.button-small { min-height: 38px; padding: 0 14px; }

.band { width: 100%; border-bottom: 1px solid var(--line); }
.section { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; padding: 92px 0; }

.intro { background: #f8f9fa; }

.intro-inner {
  width: min(var(--max), calc(100% - 48px));
  min-height: 540px;
  margin: 0 auto;
  padding: 88px 0 64px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  align-items: end;
  gap: 72px;
}

.intro-copy { max-width: 760px; }

.eyebrow {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 7px;
  border-radius: 50%;
  background: #15a36d;
  box-shadow: 0 0 0 4px #d9f3e9;
}

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

h1 {
  margin-bottom: 20px;
  font-size: clamp(54px, 8vw, 92px);
  line-height: .98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 { margin-bottom: 8px; font-size: 19px; letter-spacing: 0; }

.lede {
  max-width: 720px;
  margin-bottom: 30px;
  color: #3f464e;
  font-size: 20px;
  line-height: 1.6;
}

.intro-actions { display: flex; flex-wrap: wrap; gap: 12px; }

.signal-list {
  margin: 0;
  border-top: 1px solid #cfd4da;
}

.signal-list div {
  display: grid;
  grid-template-columns: 90px 1fr;
  align-items: baseline;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid #cfd4da;
}

.signal-list dt { font-size: 29px; font-weight: 780; }
.signal-list dd { margin: 0; color: var(--muted); font-size: 14px; }

.section-heading { max-width: 760px; margin-bottom: 38px; }
.section-heading > p:not(.eyebrow) { color: var(--muted); font-size: 17px; }

.split-heading {
  max-width: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 470px);
  align-items: end;
  gap: 72px;
}

.split-heading > p { margin-bottom: 16px; }

.code-shell {
  overflow: hidden;
  border: 1px solid #252a30;
  border-radius: 7px;
  background: var(--code);
  color: #e7ecf2;
  box-shadow: 0 18px 50px rgba(16, 21, 27, .12);
}

.code-toolbar {
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px 0 16px;
  border-bottom: 1px solid #30353d;
}

.tabs { height: 100%; display: flex; gap: 24px; }

.tab {
  position: relative;
  border: 0;
  padding: 0;
  color: #9199a3;
  background: transparent;
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}

.tab.active { color: var(--white); }
.tab.active::after { content: ""; position: absolute; right: 0; bottom: -1px; left: 0; height: 2px; background: var(--red); }

.icon-button {
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  border: 1px solid #3c424b;
  border-radius: 5px;
  color: #c8ced6;
  background: transparent;
  cursor: pointer;
}

.icon-button:hover { color: var(--white); background: #242a31; }
.icon-button svg { width: 16px; height: 16px; }

.code-panel {
  display: none;
  min-height: 235px;
  margin: 0;
  padding: 28px;
  overflow: auto;
  color: #e7ecf2;
  font-size: 14px;
  line-height: 1.75;
  white-space: pre;
}

.code-panel.active { display: block; }

.security-note {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.security-note svg { width: 18px; color: var(--teal); }
.capabilities, .contract, .cta { background: var(--soft); }

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

.capability {
  min-height: 250px;
  padding: 30px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.capability > svg { width: 25px; height: 25px; margin-bottom: 34px; color: var(--red); }
.capability p { max-width: 500px; color: var(--muted); }
.capability code { color: var(--teal); font-weight: 700; }

.workflow-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }

.workflow-list li {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) auto;
  align-items: start;
  gap: 28px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.workflow-list h3 { margin-bottom: 5px; }
.workflow-list p { margin-bottom: 0; color: var(--muted); }
.workflow-list > li > code { padding-top: 4px; color: var(--teal); white-space: nowrap; }
.step-number { color: var(--amber); font-family: Consolas, monospace; font-weight: 800; }

.contract-layout { display: grid; grid-template-columns: minmax(0, .8fr) minmax(420px, 1.2fr); gap: 72px; align-items: center; }
.contract-layout .section-heading { margin-bottom: 0; }

.text-link { display: inline-flex; align-items: center; gap: 8px; color: var(--red-dark); font-weight: 750; text-decoration: none; }
.text-link svg { width: 17px; }

.response-example {
  margin: 0;
  padding: 30px;
  overflow: auto;
  border-radius: 7px;
  color: #e7ecf2;
  background: var(--code);
  font-size: 14px;
  line-height: 1.7;
}

.limit-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.limit-grid div { min-height: 150px; padding: 26px; background: var(--white); }
.limit-grid svg { width: 22px; margin-bottom: 18px; color: var(--amber); }
.limit-grid p { margin-bottom: 0; color: var(--muted); }

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

.guide-grid > a {
  min-height: 270px;
  display: flex;
  flex-direction: column;
  padding: 28px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--white);
  text-decoration: none;
}

.guide-grid > a:hover { background: #fafbfb; }
.guide-grid span { margin-bottom: 28px; color: var(--teal); font-size: 12px; font-weight: 800; text-transform: uppercase; }
.guide-grid p { color: var(--muted); }
.guide-grid strong { margin-top: auto; color: var(--red-dark); font-size: 14px; }

.cta-inner {
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
  padding: 54px 0;
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
}

.cta-inner img { border-radius: 8px; }
.cta-inner h2 { margin: 0; font-size: 30px; }

footer {
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
  padding: 42px 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px 48px;
  color: var(--muted);
  font-size: 13px;
}

footer strong { color: var(--ink); font-size: 15px; }
footer p { margin: 4px 0 0; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { text-decoration: none; }
.footer-links a:hover { color: var(--ink); }
.legal { grid-column: 1 / -1; max-width: 880px; padding-top: 18px; border-top: 1px solid var(--line); }

.compact-topbar { grid-template-columns: 1fr auto; }

.legal-page {
  width: min(860px, calc(100% - 48px));
  margin: 0 auto;
  padding: 88px 0;
}

.legal-header {
  margin-bottom: 56px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line);
}

.legal-header h1 { margin-bottom: 14px; font-size: clamp(48px, 7vw, 76px); }
.legal-header > p:last-child { color: var(--muted); }
.legal-content { font-size: 16px; }
.legal-content h2 { margin: 42px 0 12px; font-size: 24px; }
.legal-content p, .legal-content li { color: #40474f; }
.legal-content li + li { margin-top: 8px; }

.article-page {
  width: min(900px, calc(100% - 48px));
  margin: 0 auto;
  padding: 78px 0 96px;
}

.article-header { margin-bottom: 54px; padding-bottom: 34px; border-bottom: 1px solid var(--line); }
.article-header h1 { max-width: 820px; margin-bottom: 18px; font-size: clamp(42px, 7vw, 68px); line-height: 1.03; }
.article-header .lede { margin-bottom: 0; font-size: 18px; }
.article-content { max-width: 780px; font-size: 17px; }
.article-content h2 { margin: 48px 0 14px; font-size: 28px; }
.article-content p, .article-content li { color: #40474f; }
.article-content pre { margin: 22px 0 30px; padding: 24px; overflow: auto; border-radius: 7px; color: #e7ecf2; background: var(--code); font-size: 13px; line-height: 1.7; }
.article-content .callout { margin: 28px 0; padding: 20px 22px; border-left: 3px solid var(--amber); background: #fff8e9; }
.article-content .callout p { margin: 0; color: #574820; }
.article-back { display: inline-flex; margin-bottom: 34px; color: var(--red-dark); font-size: 14px; font-weight: 750; text-decoration: none; }

@media (max-width: 900px) {
  .topbar { grid-template-columns: 1fr auto; }
  .topbar nav { display: none; }
  .intro-inner { min-height: auto; grid-template-columns: 1fr; gap: 52px; padding-top: 72px; }
  .signal-list { display: grid; grid-template-columns: repeat(3, 1fr); }
  .signal-list div { display: block; padding-right: 12px; border-right: 1px solid #cfd4da; }
  .signal-list div:last-child { border-right: 0; }
  .signal-list dd { margin-top: 5px; }
  .split-heading, .contract-layout { grid-template-columns: 1fr; gap: 24px; }
  .workflow-list li { grid-template-columns: 52px minmax(0, 1fr); }
  .workflow-list > li > code { grid-column: 2; }
  .cta-inner { grid-template-columns: 72px 1fr; }
  .cta-inner img { width: 72px; height: 72px; }
  .cta-inner .button { grid-column: 2; justify-self: start; }
}

@media (max-width: 640px) {
  .topbar { padding: 9px 16px; }
  .topbar .brand span { display: none; }
  .button-small { padding: 0 11px; }
  .section, .intro-inner, .cta-inner, footer { width: min(100% - 32px, var(--max)); }
  .section { padding: 68px 0; }
  .intro-inner { padding: 58px 0 44px; }
  h1 { font-size: 49px; }
  h2 { font-size: 34px; }
  .lede { font-size: 17px; }
  .intro-actions { align-items: stretch; flex-direction: column; }
  .intro-actions .button { width: 100%; }
  .signal-list { grid-template-columns: 1fr; }
  .signal-list div { display: grid; border-right: 0; }
  .capability-grid, .limit-grid { grid-template-columns: 1fr; }
  .guide-grid { grid-template-columns: 1fr; }
  .capability { min-height: 220px; padding: 24px; }
  .workflow-list li { gap: 12px; }
  .workflow-list > li > code { white-space: normal; overflow-wrap: anywhere; }
  .code-panel { min-height: 310px; padding: 20px; font-size: 12px; }
  .contract-layout { gap: 34px; }
  .response-example { padding: 20px; font-size: 12px; }
  .cta-inner { grid-template-columns: 58px 1fr; gap: 18px; }
  .cta-inner img { width: 58px; height: 58px; }
  .cta-inner h2 { font-size: 24px; }
  footer { grid-template-columns: 1fr; }
  .footer-links { flex-wrap: wrap; }
  .legal-page { width: calc(100% - 32px); padding: 58px 0; }
  .article-page { width: calc(100% - 32px); padding: 52px 0 68px; }
  .article-content pre { padding: 18px; font-size: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}