:root {
  --bg: #16171a;
  --bg-raised: #1c1d21;
  --line: #2e3035;
  --text: #e9e6df;
  --muted: #a09d96;
  --brass: #d9a55b;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;
  --gutter: clamp(20px, 5vw, 56px);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; color-scheme: dark; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.6 var(--sans); -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
::selection { background: var(--brass); color: var(--bg); }
:focus-visible { outline: 2px solid var(--brass); outline-offset: 3px; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 var(--gutter); }

header.top { display: flex; justify-content: space-between; align-items: center; padding: 28px 0; }
.logo { font: 600 20px/1 var(--sans); letter-spacing: -0.02em; text-decoration: none; }
.logo span { color: var(--brass); }
nav a { font-size: 14px; color: var(--muted); text-decoration: none; margin-left: 28px; }
nav a:hover { color: var(--text); }

.eyebrow { font: 500 12px/1 var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--brass); margin: 0 0 20px; }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; margin: 0; letter-spacing: -0.015em; }
h1 { font-size: clamp(2.6rem, 7vw, 5.4rem); line-height: 1.02; max-width: 15ch; }
h1 em { font-style: italic; color: var(--muted); }
h2 { font-size: clamp(1.9rem, 4vw, 3rem); line-height: 1.1; max-width: 20ch; }
h3 { font-size: 1.5rem; line-height: 1.2; }
p { margin: 0 0 1em; }
.lede { font-size: 1.2rem; color: var(--muted); max-width: 40em; }

.hero { padding: clamp(40px, 8vw, 96px) 0 clamp(48px, 8vw, 96px); display: grid; gap: 56px; grid-template-columns: 1.1fr 0.9fr; align-items: end; }
.hero .lede { margin-top: 28px; }
.cta { display: flex; flex-wrap: wrap; gap: 20px; align-items: center; margin-top: 36px; }
.btn { display: inline-block; background: var(--brass); color: var(--bg); font-weight: 600; font-size: 15px; padding: 13px 22px; border-radius: 4px; text-decoration: none; }
.btn:hover { background: #e4b571; }
.link { color: var(--muted); font-size: 15px; }
.link:hover { color: var(--text); }

.panel { background: var(--bg-raised); border: 1px solid var(--line); border-radius: 4px; font-family: var(--mono); font-size: 13px; line-height: 1.55; }
.panel-head { display: flex; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; }
.panel-body { padding: 18px 16px; }
.prompt { color: var(--text); padding-bottom: 16px; border-bottom: 1px solid var(--line); margin-bottom: 14px; }
.prompt b { color: var(--brass); font-weight: 500; margin-right: 8px; }
.panel ul { list-style: none; margin: 0; padding: 0; color: var(--muted); }
.panel li { display: flex; justify-content: space-between; gap: 16px; padding: 3px 0; }
.panel li span:last-child { color: var(--text); text-align: right; }
.panel .undo { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); color: var(--muted); }
.caption { font-size: 13px; color: var(--muted); margin: 10px 0 0; }

section { padding: clamp(56px, 9vw, 112px) 0; border-top: 1px solid var(--line); }
.head { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: end; margin-bottom: 56px; }
.head p { color: var(--muted); max-width: 34em; margin: 0; }

.modes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border: 1px solid var(--line); border-radius: 4px; }
.mode { padding: 32px 28px; border-right: 1px solid var(--line); }
.mode:last-child { border-right: 0; }
.mode .use { font: 12px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--brass); margin: 10px 0 18px; }
.mode p { color: var(--muted); font-size: 15px; }
.mode .chain { font: 13px/1.5 var(--mono); color: var(--text); border-top: 1px solid var(--line); padding-top: 14px; margin: 18px 0 0; }

ol.steps { list-style: none; counter-reset: s; margin: 0; padding: 0; border-top: 1px solid var(--line); }
ol.steps li { counter-increment: s; display: grid; grid-template-columns: 64px 1fr 1.4fr; gap: 24px; padding: 28px 0; border-bottom: 1px solid var(--line); align-items: baseline; }
ol.steps li::before { content: counter(s, decimal-leading-zero); font: 13px var(--mono); color: var(--muted); }
ol.steps h3 { font-size: 1.35rem; }
ol.steps p { margin: 0; color: var(--muted); font-size: 16px; }

.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; }
.cols h3 { margin-bottom: 14px; }
.cols p, .cols li { color: var(--muted); font-size: 16px; }
.cols ul { margin: 0; padding-left: 1.1em; }
.cols li { margin-bottom: 0.5em; }

.early { text-align: left; }
.early h2 { max-width: 16ch; }
.early .lede { margin-top: 24px; }

footer { border-top: 1px solid var(--line); padding: 36px 0 48px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

@media (max-width: 860px) {
  .hero, .head, .cols { grid-template-columns: 1fr; gap: 32px; }
  .head { margin-bottom: 36px; }
  .modes { grid-template-columns: 1fr; }
  .mode { border-right: 0; border-bottom: 1px solid var(--line); }
  .mode:last-child { border-bottom: 0; }
  ol.steps li { grid-template-columns: 40px 1fr; gap: 6px 12px; }
  ol.steps p { grid-column: 2; }
  nav a:not(.keep) { display: none; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }