:root {
  --paper: #f0f0ef;
  --ink: #141413;
  --muted: #747471;
  --quiet: #a2a29f;
  --mint: #0048ff;
  --wash: #fffffe;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overscroll-behavior: none; background: var(--paper); }
body { margin: 0; min-width: 320px; color: var(--ink); background: var(--paper); font: 14px/1.6 Geist, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; overflow-x: hidden; overscroll-behavior: none; }
a { color: inherit; text-decoration: none; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
::selection { color: var(--ink); background: #a6e9ca; }

.shell { width: min(100% - 34px, 1080px); margin: 0 auto; }
.topbar { position: sticky; z-index: 20; top: 10px; height: 76px; display: flex; align-items: center; justify-content: space-between; margin-top: 10px; border-radius: 4px; padding: 0 14px 0 11px; background: rgba(255,255,254,.94); backdrop-filter: blur(16px); }
.brand { display: flex; align-items: center; gap: 9px; font-family: "Instrument Sans", Geist, sans-serif; font-size: 14px; font-weight: 600; letter-spacing: -.04em; }
.brand img { width: 50px; height: 50px; object-fit: contain; }
.brand i { margin-left: 3px; color: var(--quiet); font-size: 11px; font-style: normal; font-weight: 500; }
.open-app { border-radius: 3px; padding: 10px 13px; color: #fff; background: var(--mint); font-size: 11.5px; font-weight: 500; }

.layout { display: grid; grid-template-columns: 150px minmax(0, 720px); justify-content: center; gap: 66px; padding: 72px 0 86px; }
.layout > nav { position: sticky; top: 112px; align-self: start; display: grid; gap: 2px; }
.layout > nav a { border-radius: 9px; padding: 7px 9px; color: var(--quiet); font-size: 11.5px; }
.layout > nav a:hover { color: var(--mint); background: rgba(111,202,156,.08); }
article { min-width: 0; }
section { margin-bottom: 48px; scroll-margin-top: 112px; }
.lead { margin-bottom: 56px; }
h1 { max-width: 650px; margin: 0 0 21px; font-family: "Instrument Sans", Geist, sans-serif; font-size: clamp(36px, 5vw, 50px); line-height: 1.02; letter-spacing: -.065em; font-weight: 500; }
h2 { margin: 0 0 13px; font-family: "Instrument Sans", Geist, sans-serif; font-size: 23px; line-height: 1.1; letter-spacing: -.045em; font-weight: 500; }
p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.72; }
.lead p { max-width: 680px; font-size: 14px; }
.lead .independent { margin-top: 15px; color: var(--quiet); font-size: 11.5px; }
.note { margin-top: 13px; color: var(--quiet); font-size: 11.5px; }

.math { display: grid; grid-template-columns: minmax(205px, 1fr) 1.25fr; align-items: baseline; gap: 20px; margin-top: 3px; border-radius: 2px; padding: 11px 13px; background: var(--wash); }
.math code { color: var(--mint); font-size: 12px; overflow-wrap: anywhere; }
.math span { color: var(--quiet); font-size: 10.5px; line-height: 1.5; }
.math-long { grid-template-columns: 1fr; gap: 6px; }
.compact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 17px; margin-top: 22px; }
.compact-grid div { display: grid; align-content: start; gap: 7px; }
.compact-grid strong { font-size: 12px; font-weight: 600; }
.compact-grid span { color: var(--quiet); font-size: 10.5px; line-height: 1.55; }

.contracts { display: grid; gap: 10px; margin-top: 18px; }
.contracts > div { display: grid; grid-template-columns: 140px minmax(0, 1fr); align-items: baseline; gap: 18px; }
.contracts span { color: var(--quiet); font-size: 11px; }
.contracts code, .contracts a { color: #4d6257; font-size: 10.5px; overflow-wrap: anywhere; }
.contracts a:hover { color: var(--mint); }

footer { min-height: 180px; display: grid; grid-template-columns: minmax(260px, 1fr) auto; align-content: center; gap: 19px 40px; margin-bottom: 10px; border-radius: 4px; padding: 35px 32px; color: var(--muted); background: #fffffe; }
footer > div { display: grid; gap: 6px; }
footer strong { color: var(--ink); font-family: "Instrument Sans", Geist, sans-serif; font-size: 13px; font-weight: 600; }
footer span, footer small { font-size: 10.5px; }
footer nav { display: flex; align-items: center; flex-wrap: wrap; gap: 5px; }
footer nav a { border-radius: 9px; padding: 7px 9px; font-size: 10.5px; }
footer nav a:hover { color: var(--mint); background: var(--paper); }
footer small { grid-column: 1 / -1; color: var(--quiet); }
footer small + small { margin-top: -14px; }

@media (max-width: 760px) {
  .shell { width: min(100% - 20px, 1080px); }
  .topbar { top: 6px; height: 68px; margin-top: 6px; border-radius: 3px; padding: 0 9px 0 7px; }
  .brand { gap: 6px; font-size: 13px; }
  .brand img { width: 44px; height: 44px; }
  .brand i { display: none; }
  .open-app { padding: 9px 10px; font-size: 10.5px; }
  .layout { display: block; padding: 54px 4px 60px; }
  .layout > nav { position: static; display: flex; flex-wrap: wrap; gap: 1px; margin-bottom: 48px; }
  .layout > nav a { font-size: 10.5px; }
  section { margin-bottom: 42px; scroll-margin-top: 94px; }
  h1 { font-size: 38px; }
  .math { grid-template-columns: 1fr; gap: 5px; }
  .compact-grid { grid-template-columns: 1fr; gap: 19px; }
  .contracts > div { grid-template-columns: 1fr; gap: 3px; }
  footer { grid-template-columns: 1fr; min-height: 220px; }
  footer small { grid-column: 1; }
  footer small + small { margin-top: -12px; }
}

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