:root {
  --bg: #0F0E0D; --surface: #1A1817; --surface2: #211E1C; --border: #2D2A26;
  --text: #F5F2EE; --muted: #A39E94; --primary: #FF7A1A; --primary-ink: #160C04;
  --olive: #8FA552; --link: #FF9A4D; --code: #2A2622;
  --side-w: 280px; --toc-w: 230px; --top-h: 60px;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #FAF8F5; --surface: #FFFFFF; --surface2: #F3EFE9; --border: #E6E0D7;
    --text: #1A1817; --muted: #6A645B; --primary: #E8650A; --primary-ink: #FFFFFF;
    --olive: #5E7330; --link: #C4520A; --code: #F1ECE4; color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #FAF8F5; --surface: #FFFFFF; --surface2: #F3EFE9; --border: #E6E0D7;
  --text: #1A1817; --muted: #6A645B; --primary: #E8650A; --primary-ink: #FFFFFF;
  --olive: #5E7330; --link: #C4520A; --code: #F1ECE4; color-scheme: light;
}
:root[data-theme="dark"] { color-scheme: dark; }

* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--top-h) + 16px); }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.65 Inter, "Segoe UI", Roboto, system-ui, -apple-system, sans-serif;
  -webkit-text-size-adjust: 100%;
}
a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--primary); }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }

/* top bar */
.top {
  position: sticky; top: 0; z-index: 20; height: var(--top-h);
  display: flex; align-items: center; gap: 12px; padding: 0 16px;
  background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-size: 17px; white-space: nowrap; }
.brand b { color: var(--primary); font-weight: 700; }
.menu-btn, .theme-btn {
  appearance: none; border: 1px solid var(--border); background: var(--surface); color: var(--text);
  width: 38px; height: 38px; border-radius: 10px; font-size: 18px; cursor: pointer; flex: none;
}
.menu-btn { display: none; }
.search { position: relative; flex: 1; max-width: 520px; margin-left: auto; }
.search input {
  width: 100%; height: 38px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); padding: 0 12px; font: inherit; font-size: 15px;
}
.results {
  position: absolute; top: 44px; left: 0; right: 0; max-height: 70vh; overflow: auto;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  box-shadow: 0 18px 50px rgba(0,0,0,.35); padding: 6px;
}
.results a { display: block; padding: 8px 10px; border-radius: 8px; color: var(--text); text-decoration: none; }
.results a:hover, .results a.active { background: var(--surface2); }
.results small { display: block; color: var(--muted); font-size: 12.5px; }
.results .snip { display: block; color: var(--muted); font-size: 13px; margin-top: 2px; }
.results mark { background: color-mix(in srgb, var(--primary) 30%, transparent); color: inherit; border-radius: 3px; }
.results .none { padding: 10px; color: var(--muted); }

/* layout */
.layout { display: grid; grid-template-columns: var(--side-w) minmax(0, 1fr) var(--toc-w); max-width: 1500px; margin: 0 auto; }
.side {
  position: sticky; top: var(--top-h); align-self: start; height: calc(100vh - var(--top-h)); overflow: auto;
  padding: 20px 14px 40px; border-right: 1px solid var(--border);
}
.side-home { display: block; font-weight: 600; color: var(--text); text-decoration: none; padding: 6px 10px; }
.side-group { margin-top: 18px; }
.side-title { margin: 0 10px 6px; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--olive); font-weight: 700; }
.side ol { list-style: none; margin: 0; padding: 0; counter-reset: ch; }
.side li a {
  display: block; padding: 6px 10px; border-radius: 8px; color: var(--muted); text-decoration: none; font-size: 14.5px; line-height: 1.35;
}
.side li a:hover { background: var(--surface); color: var(--text); }
.side li a[aria-current="page"] { background: color-mix(in srgb, var(--primary) 16%, transparent); color: var(--text); font-weight: 600; }

.content { padding: 28px 40px 80px; min-width: 0; }
.toc { position: sticky; top: var(--top-h); align-self: start; max-height: calc(100vh - var(--top-h)); overflow: auto; padding: 28px 16px; font-size: 13.5px; }
.toc-title { margin: 0 0 8px; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; font-weight: 700; }
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--border); }
.toc a { display: block; padding: 4px 10px; color: var(--muted); text-decoration: none; }
.toc a:hover, .toc a.active { color: var(--primary); }

/* content typography */
.crumbs { margin: 0 0 6px; font-size: 13px; color: var(--muted); }
.crumbs a { color: var(--muted); }
.content h1 { font-size: 34px; line-height: 1.2; margin: 0 0 18px; letter-spacing: -.01em; }
.content h2 { font-size: 25px; line-height: 1.3; margin: 48px 0 12px; padding-top: 18px; border-top: 1px solid var(--border); }
.content h3 { font-size: 19px; margin: 32px 0 8px; }
.content h4 { font-size: 16px; margin: 24px 0 6px; color: var(--olive); }
.content p, .content li { max-width: 78ch; }
.content strong { color: var(--text); }
.content code { background: var(--code); padding: 1px 6px; border-radius: 6px; font-size: .92em; }
.content blockquote {
  margin: 18px 0; padding: 12px 16px; border-left: 4px solid var(--olive); background: var(--surface);
  border-radius: 0 10px 10px 0; color: var(--text);
}
.content blockquote p { margin: 4px 0; }
.content table { border-collapse: collapse; width: 100%; margin: 14px 0 22px; font-size: 14.5px; display: block; overflow-x: auto; }
.content th, .content td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
.content th { background: var(--surface); font-weight: 600; }
.content tr:nth-child(even) td { background: color-mix(in srgb, var(--surface) 55%, transparent); }
.content ol li::marker { color: var(--primary); font-weight: 700; }

/* screenshots */
.shot { margin: 20px 0 10px; }
.shot a { display: block; border-radius: 12px; overflow: hidden; border: 1px solid var(--border); background: var(--surface); cursor: zoom-in; }
.shot img { display: block; width: 100%; height: auto; }
.shot figcaption { font-size: 13px; color: var(--muted); margin-top: 6px; }
.shot-missing { margin: 16px 0; padding: 14px; border: 1px dashed var(--border); border-radius: 12px; color: var(--muted); font-size: 14px; }
.lightbox { position: fixed; inset: 0; z-index: 50; background: rgba(0,0,0,.88); display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 16px; cursor: zoom-out; }
.lightbox[hidden] { display: none; }
.lightbox img { max-width: 100%; max-height: calc(100vh - 70px); border-radius: 8px; }
.lightbox p { color: #ddd; margin: 10px 0 0; font-size: 14px; }

/* pager */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 56px; }
.pager a { display: block; padding: 14px 16px; border: 1px solid var(--border); border-radius: 12px; text-decoration: none; color: var(--text); background: var(--surface); }
.pager a:hover { border-color: var(--primary); }
.pager small { display: block; color: var(--muted); font-size: 12.5px; }
.pager .next { text-align: right; }

/* home */
.hero h1 { font-size: 40px; margin: 8px 0 10px; }
.hero p { color: var(--muted); font-size: 18px; max-width: 64ch; }
.guide-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; margin-top: 28px; }
.guide-card { border: 1px solid var(--border); border-radius: 16px; padding: 20px 22px; background: var(--surface); }
.guide-card h2 { border: 0; margin: 0 0 6px; padding: 0; font-size: 22px; }
.guide-card h2 a { color: var(--primary); text-decoration: none; }
.guide-card p { color: var(--muted); margin: 0 0 12px; }
.guide-card ol { margin: 0; padding-left: 22px; columns: 1; }
.guide-card li { margin: 3px 0; }

@media (max-width: 1200px) {
  .layout { grid-template-columns: var(--side-w) minmax(0, 1fr); }
  .toc { display: none; }
}
@media (max-width: 860px) {
  :root { --top-h: 56px; }
  .menu-btn { display: block; }
  .brand span { display: none; }
  .layout { display: block; }
  .side {
    position: fixed; top: var(--top-h); left: 0; bottom: 0; width: min(86vw, 320px); height: auto; z-index: 30;
    background: var(--bg); transform: translateX(-100%); transition: transform .2s ease; box-shadow: 0 0 40px rgba(0,0,0,.4);
  }
  body.nav-open .side { transform: none; }
  .content { padding: 20px 16px 64px; }
  .content h1 { font-size: 27px; }
  .content h2 { font-size: 21px; }
  .hero h1 { font-size: 30px; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { text-align: left; }
}
@media (prefers-reduced-motion: reduce) { .side { transition: none; } }
@media print {
  .top, .side, .toc, .pager { display: none; }
  .layout { display: block; }
  .content { padding: 0; }
}