:root {
  --mist: #e9eef3;
  --paper: #ffffff;
  --ink: #141b26;
  --ink-2: #4a5566;
  --line: #cfd8e3;
  --vault: #3a3f9e;
  --vault-ink: #ffffff;
  --brass: #8a6320;
  --brass-soft: #f3e6cc;
  --code-bg: #f3f6f9;
  --display: "Bricolage Grotesque", ui-sans-serif, system-ui, sans-serif;
  --body: "Atkinson Hyperlegible", ui-sans-serif, system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --mist: #10151e;
    --paper: #182030;
    --ink: #e8edf4;
    --ink-2: #a7b3c4;
    --line: #2c3749;
    --vault: #8f95ff;
    --vault-ink: #10151e;
    --brass: #e2b35c;
    --brass-soft: #3a2f1a;
    --code-bg: #121a27;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --mist: #10151e; --paper: #182030; --ink: #e8edf4; --ink-2: #a7b3c4; --line: #2c3749;
  --vault: #8f95ff; --vault-ink: #10151e; --brass: #e2b35c; --brass-soft: #3a2f1a; --code-bg: #121a27;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 24px; }
body {
  margin: 0;
  background: var(--mist);
  color: var(--ink);
  font: 18px/1.6 var(--body);
  overflow-x: hidden;
  -webkit-tap-highlight-color: rgba(58, 63, 158, 0.15);
}
a { color: var(--vault); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--vault); outline-offset: 3px; border-radius: 4px; }
code, kbd, pre { font-family: var(--mono); font-size: 0.84em; }
code { background: var(--code-bg); padding: 0.1em 0.35em; border-radius: 5px; overflow-wrap: anywhere; }
kbd { border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 5px; padding: 0.05em 0.4em; background: var(--paper); }
pre { background: var(--code-bg); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; overflow-x: auto; margin: 10px 0; line-height: 1.5; }
pre code { background: none; padding: 0; }
h1, h2, h3 { font-family: var(--display); line-height: 1.1; margin: 0; text-wrap: balance; }
h2 { font-size: clamp(30px, 4.4vw, 44px); font-weight: 800; letter-spacing: -0.02em; }
h3 { font-size: 20px; font-weight: 700; }
p { margin: 0 0 12px; max-width: 68ch; }

.skip { position: absolute; left: -999px; top: 8px; background: var(--paper); padding: 8px 12px; border-radius: 8px; }
.skip:focus { left: 16px; z-index: 10; }

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 22px 24px;
  flex-wrap: wrap;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font: 800 22px var(--display); color: var(--ink); text-decoration: none; }
.top nav { display: flex; gap: 20px; flex-wrap: wrap; font-size: 16px; }
.top nav a { color: var(--ink-2); text-decoration: none; }
.top nav a:hover { color: var(--ink); }

main { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ---- hero ---------------------------------------------------------------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 56px;
  align-items: center;
  padding: 48px 0 88px;
}
.hero h1 {
  font-size: clamp(44px, 6.6vw, 84px);
  font-weight: 800;
  letter-spacing: -0.028em;
  line-height: 1;
  font-variation-settings: "opsz" 96;
}
.lede { font-size: 21px; color: var(--ink); margin-top: 24px; }
.works { color: var(--ink-2); }
.cta { display: flex; gap: 12px; flex-wrap: wrap; margin: 26px 0 16px; }
.fineprint { font-size: 15px; color: var(--ink-2); }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 12px;
  border: 1.5px solid var(--ink);
  color: var(--ink);
  background: transparent;
  font: 700 17px var(--body);
  text-decoration: none;
  cursor: pointer;
  touch-action: manipulation;
}
.button:hover { background: var(--paper); }
.button.primary { background: var(--vault); border-color: var(--vault); color: var(--vault-ink); }
.button.primary:hover { filter: brightness(1.12); }
.button.small { min-height: 40px; padding: 0 16px; font-size: 15px; }
.button.ghost { border-color: var(--line); }

/* ---- the demo: the one loud thing on the page ------------------------------ */
.demo { margin: 0; }
.window {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 30px 60px -30px rgba(20, 27, 38, 0.35);
}
.window-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.window-bar span { width: 11px; height: 11px; border-radius: 50%; background: var(--line); }
.window-bar em { margin-left: 10px; font: 13px var(--mono); font-style: normal; color: var(--ink-2); }
.window-body { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); min-height: 330px; }
.side { border-right: 1px solid var(--line); padding: 14px 10px; background: var(--mist); }
.side-label { font-size: 13px; color: var(--ink-2); margin: 2px 10px 8px; }
.side ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: minmax(0, 1fr); }
.side li {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border-radius: 9px;
  font-size: 15px;
  line-height: 1.3;
  max-height: 60px;
  transition: max-height 0.45s ease 0.35s, padding 0.45s ease 0.35s, opacity 0.3s ease 0.35s, filter 0.35s ease, background 0.2s;
}
.side li:hover, .side li:focus-within { background: var(--paper); }
.side .lockit:hover { border-color: var(--brass); color: var(--brass); }
.side li .t { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.side .lockit {
  font: 700 12px var(--body);
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink-2);
  border-radius: 7px;
  padding: 3px 8px;
  cursor: pointer;
  opacity: 0;
}
.side li:hover .lockit, .side li:focus-within .lockit, .side li.sensitive .lockit { opacity: 1; }
.side li.locked { filter: blur(7px); opacity: 0; max-height: 0; padding-top: 0; padding-bottom: 0; pointer-events: none; }
.side li.revealed { filter: none; opacity: 1; max-height: 60px; padding: 8px 10px; pointer-events: auto; background: var(--brass-soft); transition-delay: 0s; }
.side li.revealed .lockit { display: none; }
.side li.revealed::after { content: "Locked"; font: 700 11px var(--body); color: var(--brass); }
.pane { display: grid; place-items: center; padding: 24px; text-align: center; color: var(--ink-2); font-size: 15px; }
.pane .lockcard { display: grid; gap: 10px; justify-items: center; color: var(--ink); }
.pane .lockcard svg { width: 44px; height: 44px; color: var(--brass); }
.demo figcaption { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 14px; min-height: 40px; font-size: 15px; color: var(--ink-2); }
.demo figcaption span { flex: 1 1 220px; }

/* ---- sections -------------------------------------------------------------- */
.band { padding: 80px 0; border-top: 1px solid var(--line); }
.section-lede { font-size: 20px; margin: 18px 0 36px; }

.diagram {
  display: grid;
  grid-template-columns: 1fr auto 1.15fr auto 1fr;
  align-items: stretch;
  gap: 0;
  margin-bottom: 48px;
}
.node { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 18px; }
.node p { font-size: 16px; color: var(--ink-2); margin: 8px 0 0; }
.node.strong { border: 2px solid var(--vault); }
.edge { display: grid; place-items: center; position: relative; min-width: 110px; padding: 0 6px; }
.edge::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; border-top: 2px dashed var(--line); }
.edge span { position: relative; background: var(--mist); padding: 2px 6px; font-size: 13px; color: var(--ink-2); text-align: center; }

.facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 48px; }
.facts p { color: var(--ink-2); margin-top: 8px; }

.steps { list-style: none; counter-reset: step; padding: 0; margin: 0; display: grid; gap: 40px; }
.steps > li { counter-increment: step; display: grid; grid-template-columns: 56px minmax(0, 1fr); column-gap: 8px; }
.steps > li::before {
  content: counter(step);
  grid-row: span 20;
  font: 800 40px/1 var(--display);
  color: var(--vault);
}
.steps > li > * { grid-column: 2; }
.steps h3 { margin-bottom: 6px; }

.tabs { margin-top: 10px; }
.tabs [role="tablist"] { display: flex; gap: 4px; flex-wrap: wrap; border-bottom: 1px solid var(--line); }
.tabs [role="tab"] {
  font: 700 16px var(--body);
  color: var(--ink-2);
  background: none;
  border: 0;
  border-bottom: 3px solid transparent;
  padding: 10px 12px;
  cursor: pointer;
  margin-bottom: -1px;
}
.tabs [role="tab"][aria-selected="true"] { color: var(--ink); border-bottom-color: var(--vault); }
.tabs [role="tabpanel"] { padding-top: 14px; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; background: var(--paper); margin-bottom: 20px; }
table { width: 100%; border-collapse: collapse; font-size: 16px; }
th, td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
th { font-family: var(--display); font-size: 15px; }
td:first-child { white-space: nowrap; }
td:last-child { white-space: nowrap; color: var(--ink-2); }

.split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin: 28px 0 28px; }
.split > div { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.split .no { background: transparent; border-style: dashed; }
.split ul { margin: 12px 0 0; padding-left: 20px; display: grid; gap: 8px; }

details { border-top: 1px solid var(--line); padding: 16px 0; max-width: 80ch; }
details:last-of-type { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font: 700 19px var(--display); }
details p { margin-top: 12px; color: var(--ink-2); }

.foot { max-width: 1180px; margin: 0 auto; padding: 40px 24px 60px; font-size: 15px; color: var(--ink-2); border-top: 1px solid var(--line); }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 40px; padding-top: 24px; }
  .diagram { grid-template-columns: 1fr; }
  .edge { min-height: 54px; }
  .edge::before { left: 50%; right: auto; top: 0; bottom: 0; border-top: 0; border-left: 2px dashed var(--line); }
  .facts, .split { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  body { font-size: 17px; }
  main, .top, .foot { padding-left: 16px; padding-right: 16px; }
  .top nav { gap: 14px; }
  .window-body { grid-template-columns: 1fr; }
  .pane { border-top: 1px solid var(--line); min-height: 150px; }
  .side .lockit { opacity: 1; }
  .steps > li { grid-template-columns: 36px minmax(0, 1fr); }
  .steps > li::before { font-size: 28px; }
  td:first-child, td:last-child { white-space: normal; }
}
@media (prefers-reduced-motion: reduce) {
  .side li { transition: none; }
}