/* gas-docs — GitBook-style dark theme, G.A.S red branding */
:root {
  --bg: #0e0f11; --bg2: #121316; --panel: #16181b; --border: #24262b;
  --text: #d7d8db; --muted: #9a9ca3; --head: #ffffff;
  --accent: #e5484d; --accent-dim: rgba(229, 72, 77, .12);
  --code-bg: #17191d; --sidebar-w: 280px; --topbar-h: 60px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--topbar-h) + 16px); }
body { background: var(--bg); color: var(--text); font: 15px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* topbar */
.topbar { position: fixed; inset: 0 0 auto 0; height: var(--topbar-h); display: flex; align-items: center; gap: 14px; padding: 0 20px; background: rgba(14,15,17,.85); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); z-index: 50; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--head); font-weight: 700; font-size: 16px; letter-spacing: .2px; }
.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 7px; object-fit: cover; }
.brand em { color: var(--accent); font-style: normal; }
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.searchbtn { display: flex; align-items: center; gap: 8px; background: var(--panel); border: 1px solid var(--border); color: var(--muted); padding: 7px 12px; border-radius: 8px; cursor: pointer; font: inherit; font-size: 13px; }
.searchbtn:hover { border-color: #3a3d44; color: var(--text); }
.searchbtn kbd { font: 11px/1 inherit; border: 1px solid var(--border); border-radius: 4px; padding: 2px 5px; color: var(--muted); }
.topnav { display: flex; align-items: center; gap: 2px; margin-left: 18px; }
.topnav a { color: var(--muted); font-size: 13.5px; font-weight: 600; padding: 7px 12px; border-radius: 7px; }
.topnav a:hover { color: var(--head); background: var(--panel); text-decoration: none; }
.topnav a.on { color: var(--accent); background: var(--accent-dim); }
.burger { display: none; background: none; border: none; color: var(--text); font-size: 20px; cursor: pointer; }

/* layout */
.layout { display: flex; padding-top: var(--topbar-h); min-height: 100vh; }
.sidebar { position: sticky; top: var(--topbar-h); width: var(--sidebar-w); flex: 0 0 var(--sidebar-w); height: calc(100vh - var(--topbar-h)); overflow-y: auto; padding: 22px 14px 40px; border-right: 1px solid var(--border); background: var(--bg); scrollbar-width: thin; scrollbar-color: #33363c transparent; }
.nav-group { margin-bottom: 22px; }
.nav-title { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .09em; color: var(--muted); padding: 0 10px 7px; }
.nav-link { display: block; padding: 6px 10px; border-radius: 7px; color: var(--text); font-size: 13.5px; border-left: 2px solid transparent; }
.nav-link:hover { background: var(--panel); text-decoration: none; }
.nav-link.active { color: var(--accent); background: var(--accent-dim); border-left-color: var(--accent); font-weight: 600; }
.nav-link.ext { color: var(--muted); }

.content { flex: 1; display: flex; justify-content: center; gap: 40px; padding: 36px 32px 80px; min-width: 0; }
.doc { width: 100%; max-width: 740px; min-width: 0; }
.crumb { font-size: 12.5px; color: var(--muted); margin-bottom: 10px; }

/* typography */
.doc h1 { color: var(--head); font-size: 32px; line-height: 1.2; margin: 4px 0 10px; letter-spacing: -.02em; }
.doc .lead { color: var(--muted); font-size: 17px; margin-bottom: 18px; }
.doc h2 { color: var(--head); font-size: 22px; margin: 38px 0 12px; padding-top: 14px; border-top: 1px solid var(--border); letter-spacing: -.01em; }
.doc h3 { color: var(--head); font-size: 17px; margin: 26px 0 8px; }
.doc h4 { color: var(--head); font-size: 15px; margin: 18px 0 6px; }
.doc p { margin: 0 0 14px; }
.doc ul, .doc ol { margin: 0 0 16px; padding-left: 24px; }
.doc li { margin: 5px 0; }
.doc hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }
.doc blockquote { border-left: 3px solid var(--accent); background: var(--accent-dim); border-radius: 0 8px 8px 0; padding: 12px 16px; margin: 0 0 16px; }
.doc blockquote p:last-child { margin-bottom: 0; }
.doc code { background: var(--code-bg); border: 1px solid var(--border); border-radius: 5px; padding: 1.5px 6px; font: 13px/1.5 "SFMono-Regular", Consolas, "Liberation Mono", monospace; color: #f0d3d4; }
.doc pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; margin: 0 0 16px; overflow-x: auto; }
.doc pre code { background: none; border: none; padding: 0; color: #cfd2d8; font-size: 13px; }
.tbl { overflow-x: auto; margin: 0 0 18px; border: 1px solid var(--border); border-radius: 10px; }
.doc table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.doc th { text-align: left; background: var(--panel); color: var(--head); padding: 9px 13px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.doc td { padding: 9px 13px; border-bottom: 1px solid var(--border); vertical-align: top; }
.doc tr:last-child td { border-bottom: none; }
.doc img { max-width: 100%; border-radius: 10px; }

/* product meta */
.meta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 0 0 26px; }
.chip { background: var(--panel); border: 1px solid var(--border); border-radius: 999px; padding: 4px 12px; font-size: 12.5px; color: var(--muted); }
.chip b { color: var(--text); font-weight: 600; }
.chip.price { color: var(--head); font-weight: 700; border-color: #3a3d44; }
.chip.price.free { color: #4cc38a; border-color: rgba(76,195,138,.4); }
.buy { margin-left: auto; background: var(--accent); color: #fff; font-weight: 600; font-size: 13.5px; padding: 8px 16px; border-radius: 8px; }
.buy:hover { background: #f05a5f; text-decoration: none; }

/* cards */
.catgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; margin: 0 0 8px; }
.catcard { display: flex; align-items: center; gap: 10px; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 15px 16px; color: var(--head); font-weight: 600; }
.catcard small { color: var(--muted); font-weight: 400; }
.catcard b { margin-left: auto; color: var(--muted); }
.catcard:hover { border-color: var(--accent); text-decoration: none; }
.sgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; margin: 0 0 8px; }
.scard { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; color: var(--text); }
.scard:hover { border-color: var(--accent); text-decoration: none; }
.scard-top { display: flex; align-items: baseline; gap: 8px; margin-bottom: 6px; }
.scard h4 { color: var(--head); font-size: 14.5px; margin: 0; }
.scard .v { margin-left: auto; font-size: 11.5px; color: var(--accent); font-weight: 600; }
.scard p { font-size: 12.5px; color: var(--muted); margin: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.fgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; margin: 0 0 18px; }
.fcard { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; }
.fcard h4 { margin: 0 0 5px; }
.fcard p { margin: 0; font-size: 13px; color: var(--muted); }
.wpc h3 { color: var(--head); font-size: 17px; margin: 22px 0 8px; }

/* prev/next + footer */
.prevnext { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 48px; }
.pn { border: 1px solid var(--border); border-radius: 10px; padding: 13px 16px; display: flex; flex-direction: column; gap: 3px; color: var(--text); }
.pn:hover { border-color: var(--accent); text-decoration: none; }
.pn.next { text-align: right; }
.pn-dir { font-size: 12px; color: var(--muted); }
.pn-title { color: var(--head); font-weight: 600; font-size: 14px; }
.lastupd { margin-top: 26px; font-size: 12.5px; color: var(--muted); }

/* toc */
.toc { position: sticky; top: calc(var(--topbar-h) + 36px); width: 200px; flex: 0 0 200px; max-height: calc(100vh - var(--topbar-h) - 72px); overflow-y: auto; font-size: 12.5px; align-self: flex-start; }
.toc-title { font-weight: 700; color: var(--head); font-size: 11px; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 8px; }
.toc-link { display: block; color: var(--muted); padding: 3px 0 3px 10px; border-left: 2px solid var(--border); }
.toc-link.lvl3 { padding-left: 22px; }
.toc-link:hover { color: var(--text); text-decoration: none; }
.toc-link.active { color: var(--accent); border-left-color: var(--accent); }

/* search */
.search-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.6); backdrop-filter: blur(3px); z-index: 100; padding: 12vh 16px 0; }
.search-overlay.open { display: block; }
.search-box { max-width: 560px; margin: 0 auto; background: var(--bg2); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; box-shadow: 0 24px 60px rgba(0,0,0,.5); }
#search-input { width: 100%; background: none; border: none; outline: none; color: var(--head); font: 16px/1 inherit; padding: 16px 18px; border-bottom: 1px solid var(--border); }
#search-results { max-height: 50vh; overflow-y: auto; }
.sr { display: block; padding: 11px 18px; border-bottom: 1px solid var(--border); color: var(--text); }
.sr:hover, .sr.sel { background: var(--accent-dim); text-decoration: none; }
.sr b { display: block; color: var(--head); font-size: 14px; }
.sr span { font-size: 12px; color: var(--muted); display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }
.sr-empty { padding: 18px; color: var(--muted); font-size: 13.5px; }

/* responsive */
@media (max-width: 1150px) { .toc { display: none; } }
@media (max-width: 860px) {
  .burger { display: block; }
  .topnav { display: none; }
  .sidebar { position: fixed; left: 0; top: var(--topbar-h); bottom: 0; transform: translateX(-100%); transition: transform .2s; z-index: 60; background: var(--bg2); }
  .sidebar.open { transform: none; box-shadow: 20px 0 50px rgba(0,0,0,.5); }
  .content { padding: 24px 18px 60px; }
  .doc h1 { font-size: 26px; }
  .searchbtn kbd, .searchbtn span { display: none; }
  .prevnext { grid-template-columns: 1fr; }
  .buy { margin-left: 0; }
}