:root {
  --black: #282828;
  --lime: #BEFF80;
  --gray: #6B6B6B;
  --light: #DCDCDC;
  --paper: #FAF9F4;
  --link: #5A8C2E;
  --line: #E7E5DC;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--black);
  line-height: 1.7;
  background: var(--paper);
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
header.top { background: var(--black); padding: 14px 24px; position: sticky; top: 0; z-index: 20; }
header.top a { display: inline-flex; align-items: center; gap: 10px; }
header.top img { height: 28px; }
header.top .tag { color: var(--lime); font-weight: 700; font-size: 0.95rem; }

/* Layout */
.shell { max-width: 1140px; margin: 0 auto; display: flex; gap: 40px; padding: 0 24px; align-items: flex-start; }
.sidebar {
  width: 230px; flex: none; position: sticky; top: 70px;
  padding: 32px 0; align-self: flex-start; max-height: calc(100vh - 70px); overflow-y: auto;
}
.sidebar .home { display: block; font-weight: 800; font-size: 1.05rem; color: var(--black); margin-bottom: 18px; }
.sidebar .home:hover { text-decoration: none; }
.sidebar nav { display: flex; flex-direction: column; gap: 2px; }
.sidebar .group { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray); margin: 18px 0 6px; }
.sidebar nav a { color: #3a3a3a; font-size: 0.92rem; padding: 6px 10px; border-radius: 8px; }
.sidebar nav a:hover { background: #efeee7; text-decoration: none; }
.sidebar nav a.active { background: var(--lime); color: var(--black); font-weight: 600; }
.sidebar .back { display: block; margin-top: 28px; font-size: 0.85rem; color: var(--gray); }

/* Content */
main.doc { flex: 1; min-width: 0; padding: 40px 0 110px; max-width: 760px; }
main.doc .eyebrow { font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--link); margin-bottom: 8px; }
main.doc h1 { font-size: 2.1rem; letter-spacing: -0.02em; line-height: 1.15; margin-bottom: 10px; }
main.doc .lede { font-size: 1.12rem; color: #44443f; margin-bottom: 26px; }
main.doc h2 { font-size: 1.35rem; letter-spacing: -0.01em; margin: 40px 0 12px; padding-top: 8px; }
main.doc h3 { font-size: 1.05rem; margin: 26px 0 8px; }
main.doc p, main.doc li { font-size: 0.97rem; color: #3a3a3a; margin-bottom: 12px; }
main.doc ul, main.doc ol { padding-left: 22px; margin-bottom: 14px; }
main.doc li { margin-bottom: 7px; }
main.doc strong { color: var(--black); }
code { background: #efeee8; padding: 1px 6px; border-radius: 5px; font-size: 0.85em; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

/* Steps */
ol.steps { counter-reset: step; list-style: none; padding-left: 0; }
ol.steps > li { counter-increment: step; position: relative; padding-left: 42px; margin-bottom: 14px; }
ol.steps > li::before {
  content: counter(step); position: absolute; left: 0; top: -2px;
  width: 28px; height: 28px; border-radius: 50%; background: var(--black); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 0.85rem; font-weight: 700;
}

/* Callouts */
.callout { border-radius: 14px; padding: 16px 20px; margin: 18px 0; border: 1px solid var(--line); background: #fff; }
.callout p:last-child { margin-bottom: 0; }
.callout .label { font-weight: 700; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px; display: block; }
.callout.tip { border-color: var(--lime); background: #f7fff0; }
.callout.tip .label { color: #3e7a16; }
.callout.note .label { color: var(--gray); }
.callout.key { border: 2px solid var(--lime); background: #fff; }
.callout.key .label { color: #3e7a16; }

/* Cards (index) */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin: 24px 0 8px; }
.card { display: block; background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 20px 22px; color: var(--black); transition: border-color .15s, transform .15s; }
.card:hover { border-color: var(--lime); text-decoration: none; transform: translateY(-2px); }
.card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.card p { font-size: 0.9rem; color: var(--gray); margin: 0; }

/* FAQ */
.faq { margin-top: 8px; }
.faq details { border-bottom: 1px solid var(--line); padding: 14px 0; }
.faq summary { font-weight: 600; cursor: pointer; font-size: 1rem; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "+"; color: var(--link); font-weight: 700; margin-right: 10px; }
.faq details[open] summary::before { content: "–"; }
.faq details p { margin-top: 10px; }

.pagenav { display: flex; justify-content: space-between; gap: 16px; margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 0.92rem; }

@media (max-width: 820px) {
  .shell { flex-direction: column; gap: 0; padding: 0; }
  .sidebar { width: 100%; position: static; max-height: none; padding: 16px 24px; border-bottom: 1px solid var(--line); background: #fff; }
  .sidebar nav { flex-flow: row wrap; gap: 4px; }
  .sidebar .group { width: 100%; margin: 10px 0 2px; }
  .sidebar .back { margin-top: 14px; }
  main.doc { padding: 28px 24px 90px; }
  .cards { grid-template-columns: 1fr; }
}