:root {
  --bg: #f4f4f5;
  --fg: #0f0f0f;
  --muted: #707579;
  --accent: #3390ec;
  --accent2: #2aabee;
  --card: #ffffff;
  --stroke: #e7e7e7;
  --warn: #e53935;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.55;
}
a { color: var(--accent); }
a:hover { color: var(--accent2); }
.shell { max-width: 1080px; margin: 0 auto; padding: 1.25rem 1.25rem 4rem; }
.topnav {
  display: flex; flex-wrap: wrap; align-items: center; gap: .65rem 1rem;
  margin-bottom: 2rem; padding-bottom: 1rem;
  border-bottom: 1px solid var(--stroke);
}
.brand {
  font-weight: 750; letter-spacing: -.04em; font-size: 1.15rem;
  color: var(--fg); text-decoration: none; margin-right: .5rem;
}
.brand span { color: var(--accent); }
.topnav nav { display: flex; flex-wrap: wrap; gap: .35rem .75rem; }
.topnav nav a {
  text-decoration: none; color: var(--muted); font-size: .92rem; font-weight: 600;
  padding: .35rem .55rem; border-radius: 8px;
}
.topnav nav a:hover, .topnav nav a.active {
  color: var(--fg); background: #e7f3fc;
}
.eyebrow {
  color: var(--accent); font-size: .82rem; font-weight: 650;
  letter-spacing: .05em; text-transform: uppercase; margin: 0 0 .75rem;
}
h1 {
  font-size: clamp(1.9rem, 4.5vw, 2.7rem);
  letter-spacing: -.04em; line-height: 1.12;
  margin: 0 0 .75rem;
}
h2 {
  font-size: 1.25rem; letter-spacing: -.02em;
  margin: 0 0 .6rem;
}
h3 { font-size: 1.02rem; margin: 1.1rem 0 .4rem; }
.lead { color: var(--muted); font-size: 1.05rem; margin: 0 0 1.75rem; max-width: 40rem; }
.grid { display: grid; gap: 1rem; }
@media (min-width: 700px) {
  .grid.two { grid-template-columns: 1fr 1fr; }
  .grid.three { grid-template-columns: 1fr 1fr 1fr; }
}
.card {
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 12px;
  padding: 1.15rem 1.2rem;
}
.card p, .card li { color: #3a3a3a; font-size: .95rem; margin: .35rem 0; }
.card ul, .card ol { margin: .35rem 0 0; padding-left: 1.15rem; }
.card > p:first-of-type { margin-top: 0; }
.card a.more {
  display: inline-block; margin-top: .85rem;
  font-weight: 650; text-decoration: none; font-size: .92rem;
}
.pill {
  display: inline-block; margin: .2rem .35rem .2rem 0;
  padding: .5rem .85rem; border-radius: 10px;
  background: #fff; border: 1px solid var(--stroke);
  color: var(--fg); text-decoration: none; font-size: .88rem; font-weight: 600;
}
.pill.primary {
  background: var(--accent);
  color: #fff; border: none;
}
.code {
  display: block; margin: .7rem 0;
  padding: .8rem 1rem; border-radius: 10px;
  background: #fff; border: 1px solid var(--stroke);
  font-family: ui-monospace, Consolas, monospace; font-size: .92rem;
  overflow-x: auto;
}
.note {
  margin: .9rem 0 0;
  padding: .85rem 1rem; border-radius: 10px;
  background: #e7f3fc; border: 1px solid #c5e2f7;
  color: #1a4a6e; font-size: .92rem;
}
.warn {
  margin: .9rem 0 0;
  padding: .85rem 1rem; border-radius: 10px;
  background: #fff4e5; border: 1px solid #ffd8a8;
  color: #8a4b08; font-size: .92rem;
}
.stepnum {
  display: inline-grid; place-items: center;
  width: 1.45rem; height: 1.45rem; border-radius: 999px;
  background: #e7f3fc; color: var(--accent);
  font-size: .78rem; font-weight: 700; margin-right: .35rem;
}
table {
  width: 100%; border-collapse: collapse; font-size: .92rem;
  margin: .5rem 0;
}
th, td {
  text-align: left; padding: .65rem .55rem;
  border-bottom: 1px solid var(--stroke); vertical-align: top;
}
th { color: var(--muted); font-weight: 650; font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; }
td { color: #3a3a3a; }
.tag {
  display: inline-block; padding: .15rem .5rem; border-radius: 6px;
  background: #e7f3fc; color: #1a5f9e; font-size: .78rem; font-weight: 650;
}
footer {
  margin-top: 2.75rem; padding-top: 1.25rem;
  border-top: 1px solid var(--stroke);
  color: var(--muted); font-size: .88rem;
}
footer a { color: var(--accent); text-decoration: none; margin-right: .85rem; }
.toc { list-style: none; padding: 0; margin: 0; }
.toc li { margin: .4rem 0; }
.toc a { text-decoration: none; font-weight: 600; color: #3a3a3a; }
.toc a:hover { color: var(--accent); }
.layout { display: grid; gap: 1.5rem; }
@media (min-width: 900px) {
  .layout.with-side {
    grid-template-columns: 200px 1fr;
    align-items: start;
  }
  .side { position: sticky; top: 1rem; }
}
.side h2 { font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.kicker { color: var(--muted); font-size: .9rem; margin: 0 0 1.5rem; }
section.block { margin-bottom: 1.25rem; }