:root {
  --paper: #f4efe6; --paper-2: #ebe4d6; --ink: #1d1b16; --ink-2: #5b554a; --rule: #d6cdbb;
  --arrow: #c8432b; --core: #2f5d50; --serif: "Iowan Old Style", "Charter", "New York", Georgia, serif;
  --sans: "Avenir Next", "Segoe UI", system-ui, sans-serif; --mono: "Fira Code", ui-monospace, "SF Mono", Menlo, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.55 var(--serif); }
a { color: inherit; }
.top { position: sticky; top: 0; z-index: 2; display: flex; align-items: baseline; justify-content: space-between; gap: 1rem;
  padding: .8rem clamp(1rem, 4vw, 3rem); background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(6px); border-bottom: 1px solid var(--rule); font-family: var(--sans); }
.mark { font: 600 1.15rem var(--serif); text-decoration: none; letter-spacing: .01em; }
.top nav { display: flex; gap: clamp(.7rem, 2vw, 1.6rem); flex-wrap: wrap; font-size: .9rem; }
.top nav a { text-decoration: none; color: var(--ink-2); }
.top nav a:hover { color: var(--arrow); }
main { max-width: 1120px; margin: 0 auto; padding: 0 clamp(1rem, 4vw, 3rem); }
.hero { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(1rem, 4vw, 3.5rem); align-items: center; padding: clamp(2.5rem, 7vw, 5.5rem) 0 3rem; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.6rem); line-height: 1.06; margin: 0 0 1.2rem; font-weight: 600; letter-spacing: -.012em; }
.lede { font-size: 1.15rem; color: var(--ink-2); max-width: 34em; margin: 0 0 1.4rem; }
.status { font: .85rem var(--sans); color: var(--ink-2); margin: 0; }
.status span { display: inline-block; padding: .1rem .55rem; margin-right: .6rem; border: 1px solid var(--arrow); color: var(--arrow); border-radius: 99px; }
.hero-fig { margin: 0; }
.hero-fig svg { width: 100%; height: auto; }
.arrows line { stroke: var(--arrow); stroke-width: 1.6; }
.arrowhead { fill: var(--arrow); }
.obj { fill: var(--ink); }
.obj-label { fill: var(--paper); font: 600 15px var(--sans); text-anchor: middle; }
.rec text { font: 13px var(--mono); fill: var(--ink); text-anchor: middle; }
.band { border-top: 1px solid var(--rule); padding: 2.6rem 0 2.8rem; }
h2 { font-size: 1.65rem; margin: 0 0 1.2rem; font-weight: 600; }
h3 { font: 600 1rem var(--sans); margin: 0 0 .45rem; letter-spacing: .01em; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 2.2rem; align-items: start; }
.two p { margin: 0; }
.three { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.8rem; margin-top: 1.6rem; }
.three p { margin: 0; color: var(--ink-2); }
.code { margin: 0; background: var(--ink); color: #efe7d6; border-radius: 8px; padding: 1.1rem 1.2rem; overflow-x: auto;
  font: 13.5px/1.55 var(--mono); }
.code.wide { max-width: 100%; }
.flow { width: 100%; height: auto; }
.flow .box rect { fill: var(--paper-2); stroke: var(--rule); }
.flow .core rect { fill: var(--core); stroke: none; }
.flow text { font: 600 18px var(--sans); text-anchor: middle; fill: var(--ink); }
.flow .core text { fill: var(--paper); }
.flow text.small { font: 14px var(--mono); fill: var(--ink-2); font-weight: 400; }
.flow .core text.small { fill: #cfe0d8; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; }
.cards article { background: var(--paper-2); border-radius: 8px; padding: 1.1rem 1.15rem 1.2rem; border-top: 3px solid var(--arrow); }
.cards p { margin: 0 0 .7rem; color: var(--ink-2); font-size: .97rem; }
.cards .quote { font-style: italic; color: var(--ink); }
audio { width: 100%; height: 34px; }
footer { border-top: 1px solid var(--rule); text-align: center; font: .85rem var(--sans); color: var(--ink-2); padding: 1.6rem 1rem 2.4rem; }
@media (max-width: 820px) {
  .hero, .two, .three, .cards { grid-template-columns: 1fr; }
  .hero { padding-top: 2rem; }
  .top nav { font-size: .82rem; }
}