:root {
  color-scheme: dark;
  font-family: "Geist", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --ink: #f4f7ff;
  --ink-soft: #c4cde0;
  --night: #050812;
  --night-raised: #0a1020;
  --panel-solid: #10182c;
  --line: rgba(164, 184, 224, 0.18);
  --cyan: #66e3ff;
  --cyan-bright: #a5f1ff;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 1rem; }
body { margin: 0; background: var(--night); color: var(--ink); line-height: 1.6; }
a { color: var(--cyan); text-underline-offset: .2em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 5px; }
.shell { width: min(1120px, 100% - 3rem); margin-inline: auto; }
.skip { position: absolute; top: 1rem; left: 1rem; transform: translateY(-200%); }
.skip:focus { transform: none; background: var(--night); z-index: 1; }

.site-header, .site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .75rem 1.5rem;
  padding-block: 1.25rem;
  font: .85rem/1.5 var(--mono);
}
.site-header a, .site-footer a { text-decoration: none; }
.site-header a:hover, .site-footer a:hover { text-decoration: underline; }
.brand { font-weight: 700; letter-spacing: .05em; }
.brand span, .site-footer { color: var(--ink-soft); }
.site-header nav { display: flex; flex-wrap: wrap; gap: .5rem 1.4rem; }
.site-header nav a { color: var(--ink); }

.hero {
  background:
    radial-gradient(circle at 10% -5%, rgba(87, 103, 255, 0.2), transparent 34rem),
    radial-gradient(circle at 94% 11%, rgba(45, 207, 236, 0.11), transparent 30rem),
    var(--night-raised);
  border-block: 1px solid var(--line);
}
.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 5vw, 5rem);
  align-items: center;
  padding-block: clamp(2.5rem, 8vw, 6rem);
}
h1, h2, h3, p, figure { margin: 0; }
h1 {
  max-width: 11ch;
  font-size: clamp(3rem, 7vw, 6.25rem);
  line-height: .98;
  letter-spacing: -.075em;
  text-wrap: balance;
}
.hero p { max-width: 44ch; color: var(--ink-soft); margin-block: 1.5rem; }
figure { min-width: 0; }
figure img { display: block; width: 100%; height: auto; border: 1px solid var(--line); }
figcaption { margin-top: .7rem; color: var(--ink-soft); font: .72rem/1.5 var(--mono); }
.button {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  background: var(--cyan);
  color: #06101a;
  padding: .7rem 1.05rem;
  font-weight: 700;
  text-decoration: none;
}
.button:hover { background: var(--cyan-bright); }

.section {
  padding-block: clamp(2.5rem, 6vw, 5rem);
  border-bottom: 1px solid var(--line);
}
.section-intro { margin-bottom: 1.75rem; }
h2 { font-size: clamp(2rem, 4.5vw, 3.3rem); line-height: 1.05; letter-spacing: -.05em; }
.section-intro p { max-width: 65ch; margin-top: .8rem; color: var(--ink-soft); }
h3 { font-size: 1.22rem; letter-spacing: -.02em; }
.steps {
  display: grid;
  gap: 1.4rem;
  max-width: 52rem;
  margin: 0;
  padding-left: 1.75rem;
}
.steps > li { padding-left: .35rem; min-width: 0; }
.steps > li::marker { color: var(--cyan); font: 700 .9rem var(--mono); }
code { font: .88em/1.5 var(--mono); color: var(--cyan); overflow-wrap: anywhere; }
pre {
  overflow-x: auto;
  padding: .9rem 1.1rem;
  margin: .55rem 0;
  border: 1px solid var(--line);
  background: var(--night-raised);
}
pre code { overflow-wrap: normal; }
details { border-bottom: 1px solid var(--line); padding-block: .6rem; }
summary { cursor: pointer; font-weight: 650; }
details p, .note { color: var(--ink-soft); margin-top: .5rem; }
.note { margin-top: .85rem; }
.prompts { padding-left: 1.3rem; margin-bottom: 0; color: var(--ink-soft); }
.catalog {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.catalog article { padding: clamp(1rem, 3vw, 1.8rem); background: var(--panel-solid); }
dl { margin-bottom: 0; }
dt { font-weight: 650; }
dd { color: var(--ink-soft); margin: .1rem 0 .8rem; }
dd:last-child { margin-bottom: 0; }

@media (max-width: 720px) {
  .shell { width: min(1120px, 100% - 2rem); }
  .hero-inner, .catalog { grid-template-columns: 1fr; }
}