:root {
  --ink: #0b0b0c; --paper: #f4f4f1; --graphite: #5c5c60; --faint: #8b8b8f; --rule: #d8d8d3; --panel: #ffffff;
  --sans: "Geist", "Segoe UI", system-ui, sans-serif;
  --mono: "Geist Mono", "Cascadia Code", Consolas, ui-monospace, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --ink: #f1f1ee; --paper: #0b0b0c; --graphite: #a3a3a6; --faint: #6f6f73; --rule: #242426; --panel: #131314; color-scheme: dark; }
}
:root[data-theme="dark"] { --ink: #f1f1ee; --paper: #0b0b0c; --graphite: #a3a3a6; --faint: #6f6f73; --rule: #242426; --panel: #131314; color-scheme: dark; }

* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.6 var(--sans); letter-spacing: -0.01em; padding-inline: 16px; -webkit-font-smoothing: antialiased; }
.wrap { max-width: 640px; margin: 0 auto; }
a { color: inherit; }
header { display: flex; align-items: center; padding-block: 22px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; font-size: 20px; letter-spacing: -0.04em; text-decoration: none; }
.mark { display: flex; gap: 3px; align-items: flex-end; height: 18px; }
.mark i { width: 5px; background: var(--ink); border-radius: 3px; display: block; }
.mark i:first-child { height: 18px; } .mark i:last-child { height: 13px; }

main { padding-block: 48px 72px; }
h1 { font-size: clamp(38px, 8vw, 60px); line-height: 1; letter-spacing: -0.05em; font-weight: 600; margin: 0; text-wrap: balance; }
.lede { font-size: 19px; color: var(--graphite); margin: 18px 0 32px; }
.dl { display: inline-flex; align-items: center; gap: 12px; background: var(--ink); color: var(--paper); padding: 18px 30px; border-radius: 14px; font: 600 19px var(--sans); text-decoration: none; }
.dl:hover { opacity: .88; }
.dl:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
.dl svg { width: 20px; height: 20px; }
.note { font-size: 14px; color: var(--faint); margin-top: 12px; }

ol { list-style: none; padding: 0; margin: 56px 0 0; border-top: 1px solid var(--rule); counter-reset: s; }
ol li { counter-increment: s; display: grid; grid-template-columns: 40px 1fr; gap: 4px 12px; padding: 20px 0; border-bottom: 1px solid var(--rule); }
ol li::before { content: counter(s); font: 500 14px var(--mono); color: var(--faint); padding-top: 3px; }
ol b { font-weight: 600; }
ol p { margin: 4px 0 0; color: var(--graphite); font-size: 15.5px; grid-column: 2; }
kbd { font: 500 13.5px var(--mono); border: 1px solid var(--rule); background: var(--panel); border-radius: 6px; padding: 1px 6px; }

.after { margin-top: 40px; font-size: 15.5px; color: var(--graphite); }
.after strong { color: var(--ink); font-weight: 600; }
footer { padding-block: 32px; font-size: 14px; color: var(--faint); }

nav { margin-left: auto; display: flex; gap: 20px; font-size: 15px; color: var(--graphite); }
nav a { text-decoration: none; } nav a:hover, nav a[aria-current] { color: var(--ink); }
nav a[aria-current] { text-decoration: underline; text-underline-offset: 5px; }
@media (max-width: 480px) { nav { gap: 14px; font-size: 14px; } }