:root { color-scheme: light dark; --bg: #0a0c0f; --surface: #111418; --ink: #e8eaed; --muted: #a7adb6; --line: #303844; --accent: #9ec5ff; font: 1rem/1.65 system-ui, sans-serif; }
@media (prefers-color-scheme: light) { :root { --bg: #eef2f6; --surface: #f8fafc; --ink: #101828; --muted: #475467; --line: #bcc6d3; --accent: #1d4ed8; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); overflow-wrap: anywhere; }
a { color: var(--accent); text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
.wrap { max-width: 74rem; margin-inline: auto; padding-inline: clamp(1.25rem, 4vw, 3rem); }
.skip { position: absolute; inset-block-start: -10rem; inset-inline-start: 1rem; padding: 0.75rem; background: var(--surface); z-index: 2; }
.skip:focus { inset-block-start: 1rem; }
header { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; padding-block: 1.5rem; }
.brand { display: flex; align-items: center; gap: 0.75rem; font-weight: 700; letter-spacing: 0.04em; color: var(--ink); text-decoration: none; }
header img { width: 2rem; height: 2rem; }
nav { display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; }
nav a { display: inline-block; padding-block: 0.25rem; }
.notice { color: var(--muted); padding-block: 0.75rem; border-block: 1px solid var(--line); font-size: 0.875rem; }
.intro { padding-block: clamp(2rem, 5vw, 4rem) 1.5rem; max-width: 55rem; }
.eyebrow { color: var(--accent); font-size: 0.875rem; }
.breadcrumbs { padding-block-start: 1.5rem; font-size: 0.875rem; color: var(--muted); }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 0.5em 1em; list-style: none; margin: 0; padding: 0; }
.breadcrumbs li { margin: 0; padding: 0; }
.breadcrumbs li + li::before { content: "/"; margin-inline-end: 1em; }
.breadcrumbs + .intro { padding-block-start: 1.5rem; }
.byline { color: var(--muted); font-size: 0.875rem; }
h1 { font-size: clamp(2.125rem, 5vw, 4rem); font-weight: 650; line-height: 1.12; letter-spacing: -0.04em; margin: 0 0 1.5rem; text-wrap: balance; }
.lead { color: var(--muted); font-size: 1.125rem; max-width: 58ch; }
.open { display: inline-flex; align-items: center; justify-content: center; min-height: 3rem; max-width: 100%; padding: 0.75em 1em; border-radius: 0.5rem; background: #1d4ed8; color: #fff; text-decoration: none; font-weight: 650; }
.open:hover { background: #1e40af; }
.hero { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 3rem; align-items: center; padding-block-end: 3rem; }
figure { margin: 0; padding: 1.5rem; background: var(--surface); border: 1px solid var(--line); border-radius: 0.75rem; }
figure svg { display: block; width: 100%; height: auto; color: var(--accent); }
figcaption, .muted { color: var(--muted); font-size: 0.875rem; }
.tutorial-figure { max-width: 72ch; margin-block-end: 2rem; padding: 0; overflow: hidden; }
.tutorial-figure img { display: block; width: 100%; height: auto; }
.tutorial-figure figcaption { padding: 1rem 1.5rem; }
section { padding-block: 2rem; border-block-start: 1px solid var(--line); }
h2 { font-size: 1.625rem; line-height: 1.25; letter-spacing: -0.02em; margin: 0 0 1.25rem; }
h3 { font-size: 1.125rem; line-height: 1.4; }
.guides { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem; }
.guides p, .facts p { color: var(--muted); }
.reading { max-width: 72ch; }
.reading section { padding-block: 1.75rem; }
li { margin-block-end: 0.75rem; padding-inline-start: 0.25rem; }
.facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem; }
.table-wrap { overflow-x: auto; margin-block: 1.5rem; }
table { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; }
th, td { text-align: start; border-block-end: 1px solid var(--line); padding: 0.65rem; }
code { font-size: 0.95em; }
footer { border-block-start: 1px solid var(--line); padding-block: 2rem 3rem; margin-block-start: 3rem; color: var(--muted); font-size: 0.875rem; }
footer nav { margin-block-end: 1.5rem; }
@media (max-width: 54rem) { .hero, .guides { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; } figure { max-width: 36rem; } }
@media (max-width: 40rem) { .facts { grid-template-columns: minmax(0, 1fr); } }
@media print { :root { --bg: #fff; --surface: #fff; --ink: #000; --muted: #333; --line: #999; --accent: #174ea6; } .skip { display: none; } h1 { font-size: 2rem; } }