/* ============================================================
   FINALITY LABS — DOCS — Grey / White / Black theme
   Inspired by the Finality Landing theme (#060708 / #f8fafc)
   ============================================================ */

:root {
  --bg: #060708;
  --bg-raised: #0b0d10;
  --foreground: #f8fafc;
  --foreground-soft: #e2e8f0;
  --card-bg: #12151c;
  --card-bg-hover: #171b24;
  --card-border: rgba(255, 255, 255, 0.07);
  --border-strong: rgba(255, 255, 255, 0.12);
  --muted: #9aa3af;
  --muted-2: #6b7280;
  --accent: #ffffff;
  --accent-soft: #cbd5e1;
  --code-bg: #0d0f14;
  --code-border: rgba(255, 255, 255, 0.06);
  --navy-hover: rgba(255, 255, 255, 0.04);
  --sidebar-w: 288px;
  --topbar-h: 60px;
  --mono: "SFMono-Regular", "Cascadia Code", "Consolas", "Menlo", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: "Playfair Display", Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--foreground);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

::selection { background: var(--foreground); color: var(--bg); }

/* ---------- Grain / noise overlay (Finality signature) ---------- */
.noise-overlay {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.05;
  pointer-events: none;
  z-index: 9999;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ---------- Scrollbars ---------- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #23262e; border-radius: 6px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: #2f333c; }

/* ---------- Layout shell ---------- */
.shell { display: flex; min-height: 100vh; }

/* ---------- Top bar ---------- */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-h);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
  background: rgba(6, 7, 8, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--card-border);
}

.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: 0.5px; }
.brand .logo {
  height: 26px;
  width: auto;
  object-fit: contain;
  display: block;
}
.brand .name { font-size: 14px; color: var(--foreground); }
.brand .name span { color: var(--muted); font-weight: 400; }

.topbar .search {
  flex: 1;
  max-width: 420px;
  margin-left: 12px;
  position: relative;
}
.topbar .search input {
  width: 100%;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--foreground);
  padding: 8px 12px 8px 34px;
  border-radius: 8px;
  font-size: 13px;
  font-family: var(--sans);
  outline: none;
  transition: border-color 0.15s;
}
.topbar .search input::placeholder { color: var(--muted-2); }
.topbar .search input:focus { border-color: var(--border-strong); }
.topbar .search svg { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); color: var(--muted-2); }

.topbar .links { margin-left: auto; display: flex; align-items: center; gap: 6px; }
.topbar .links a {
  color: var(--muted);
  font-size: 13px;
  padding: 7px 12px;
  border-radius: 7px;
  border: 1px solid transparent;
  transition: all 0.15s;
}
.topbar .links a:hover { color: var(--foreground); background: var(--navy-hover); border-color: var(--card-border); }

/* Search results dropdown */
.search-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0; right: 0;
  background: var(--card-bg);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6);
  max-height: 340px;
  overflow-y: auto;
  z-index: 200;
  display: none;
}
.search-results.open { display: block; }
.search-results .sr-item {
  display: block;
  padding: 10px 14px;
  border-bottom: 1px solid var(--card-border);
}
.search-results .sr-item:last-child { border-bottom: none; }
.search-results .sr-item:hover { background: var(--card-bg-hover); }
.search-results .sr-item b { display: block; font-size: 13.5px; color: var(--foreground); }
.search-results .sr-item span { font-size: 12px; color: var(--muted); }
.search-results .sr-empty { padding: 14px; color: var(--muted); font-size: 13px; }

/* ---------- Sidebar ---------- */
.sidebar {
  position: fixed;
  top: var(--topbar-h);
  bottom: 0;
  left: 0;
  width: var(--sidebar-w);
  overflow-y: auto;
  background: var(--bg-raised);
  border-right: 1px solid var(--card-border);
  padding: 22px 12px 60px;
  z-index: 50;
}
.sidebar .nav-group { margin-bottom: 22px; }
.sidebar .nav-group .group-label {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-2);
  padding: 0 10px 8px;
  font-weight: 600;
}
.sidebar .nav-group a {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 10px;
  border-radius: 7px;
  color: var(--muted);
  font-size: 13.5px;
  border-left: 2px solid transparent;
  transition: all 0.12s;
}
.sidebar .nav-group a svg { flex-shrink: 0; opacity: 0.7; }
.sidebar .nav-group a:hover { color: var(--foreground); background: var(--navy-hover); }
.sidebar .nav-group a.active {
  color: var(--foreground);
  background: var(--card-bg);
  border-left-color: var(--foreground);
}

/* ---------- Main content ---------- */
.main {
  flex: 1;
  margin-left: var(--sidebar-w);
  padding-top: var(--topbar-h);
  min-width: 0;
}
.content {
  max-width: 1120px;
  margin: 0 auto;
  padding: 56px 56px 120px;
}

/* Breadcrumb */
.crumbs { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--muted-2); margin-bottom: 28px; }
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--foreground); }
.crumbs span.divider { color: var(--muted-2); }

/* Page header */
.page-head { margin-bottom: 40px; }
.page-head .kicker {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 18px;
}
.page-head h1 {
  font-family: var(--serif);
  font-size: 46px;
  line-height: 1.15;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}
.page-head p { color: var(--muted); font-size: 18px; max-width: 760px; margin: 0; }

/* Typography */
h2 {
  font-family: var(--serif);
  font-size: 30px;
  margin: 52px 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--card-border);
  letter-spacing: -0.01em;
}
h3 { font-size: 19px; margin: 34px 0 10px; color: var(--foreground-soft); }
h4 { font-size: 16px; margin: 26px 0 8px; color: var(--foreground-soft); }
p { margin: 0 0 16px; }
ul, ol { margin: 0 0 18px; padding-left: 22px; }
li { margin-bottom: 7px; }
li::marker { color: var(--muted-2); }
strong { color: var(--foreground); }
em { color: var(--foreground-soft); }

code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--card-bg);
  border: 1px solid var(--code-border);
  padding: 2px 6px;
  border-radius: 5px;
  color: #dbe2ea;
}

/* Callouts */
.callout {
  display: flex;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--card-border);
  border-left: 3px solid var(--muted);
  background: var(--card-bg);
  border-radius: 8px;
  margin: 22px 0;
  font-size: 14px;
}
.callout .ico { font-size: 16px; line-height: 1.4; }
.callout.info { border-left-color: #8fa1b3; }
.callout.warn { border-left-color: #d4c5a0; }
.callout.danger { border-left-color: #b07070; }
.callout.ok { border-left-color: #7fae8f; }

/* Cards / grids */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
  margin: 22px 0;
}
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 18px;
  transition: border-color 0.15s, transform 0.15s, background 0.15s;
}
a.card:hover { border-color: var(--border-strong); background: var(--card-bg-hover); transform: translateY(-2px); }
.card .card-title { font-size: 14px; font-weight: 600; margin-bottom: 6px; display: flex; align-items: center; gap: 8px; }
.card .card-desc { font-size: 13px; color: var(--muted); margin: 0; }
.card .card-meta { font-family: var(--mono); font-size: 11px; color: var(--muted-2); margin-top: 10px; }

/* Stat blocks */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin: 22px 0; }
.stat {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 18px;
  text-align: center;
}
.stat .num { font-family: var(--mono); font-size: 30px; font-weight: 700; color: var(--foreground); line-height: 1.1; }
.stat .lbl { font-size: 12px; color: var(--muted); margin-top: 6px; letter-spacing: 0.04em; text-transform: uppercase; }

/* Tables */
.table-wrap { overflow-x: auto; margin: 22px 0; border: 1px solid var(--card-border); border-radius: 10px; }
table { width: 100%; border-collapse: collapse; font-size: 13.5px; background: var(--card-bg); }
thead th {
  text-align: left;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-strong);
  background: var(--bg-raised);
}
tbody td { padding: 11px 16px; border-bottom: 1px solid var(--card-border); color: var(--foreground-soft); vertical-align: top; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--navy-hover); }

/* Code blocks */
pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 10px;
  padding: 18px 20px;
  overflow-x: auto;
  margin: 20px 0;
  line-height: 1.65;
}
pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 13px;
  color: #e2e8f0;
}
.cm { color: var(--muted-2); }

/* Terminal prompt styling */
pre .pr { color: #a3b3c2; }

/* Flow diagram (CSS boxes + arrows) */
.flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 24px 0;
}
.flow .node {
  background: var(--card-bg);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 9px 14px;
  font-size: 12.5px;
  font-family: var(--mono);
  color: var(--foreground-soft);
  text-align: center;
}
.flow .node.hl { background: #1a1e26; border-color: var(--foreground); color: var(--foreground); }
.flow .arrow { color: var(--muted-2); font-family: var(--mono); font-size: 13px; }

/* Vertical flow */
.vflow { display: flex; flex-direction: column; gap: 0; margin: 22px 0; }
.vflow .node {
  background: var(--card-bg);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 13px;
  font-family: var(--mono);
}
.vflow .vline { text-align: center; color: var(--muted-2); font-family: var(--mono); font-size: 13px; line-height: 1; padding: 2px 0; }

/* Architecture service blocks */
.arch { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 24px 0; }
.arch .svc {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 20px;
  position: relative;
}
.arch .svc .port {
  position: absolute;
  top: 16px; right: 16px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  border: 1px solid var(--card-border);
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--bg);
}
.arch .svc h4 { margin: 0 0 8px; font-size: 15px; }
.arch .svc p { font-size: 13px; color: var(--muted); margin: 0 0 10px; }
.arch .svc ul { margin: 0; padding-left: 16px; font-size: 12.5px; }
.arch .svc li { margin-bottom: 4px; color: var(--foreground-soft); }

/* Tabs (code switcher) */
.tabs { display: flex; gap: 6px; margin: 20px 0 0; }
.tabs button {
  background: var(--bg-raised);
  border: 1px solid var(--card-border);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  padding: 7px 14px;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
}
.tabs button.active { background: var(--code-bg); color: var(--foreground); border-color: var(--border-strong); border-bottom-color: var(--code-bg); }
.tab-pane { display: none; }
.tab-pane.active { display: block; }
.tab-pane pre { margin-top: 0; border-radius: 0 10px 10px 10px; }

/* Pill tags */
.pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 20px;
  border: 1px solid var(--card-border);
  color: var(--muted);
  background: var(--card-bg);
  margin: 0 4px 4px 0;
}
.pill.green { border-color: rgba(127, 174, 143, 0.35); color: #9fc7ad; }
.pill.amber { border-color: rgba(212, 197, 160, 0.35); color: #d8cba6; }
.pill.red { border-color: rgba(176, 112, 112, 0.35); color: #cfa0a0; }

/* Step list */
.steps { counter-reset: step; list-style: none; padding-left: 0; }
.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 44px;
  margin-bottom: 16px;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: 2px;
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--foreground);
  background: var(--card-bg);
}

/* Prev / Next */
.pagenav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 72px;
  padding-top: 26px;
  border-top: 1px solid var(--card-border);
}
.pagenav a {
  display: block;
  max-width: 46%;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 14px 18px;
  transition: border-color 0.15s, background 0.15s;
}
.pagenav a:hover { border-color: var(--border-strong); background: var(--card-bg-hover); }
.pagenav a .dir { font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted-2); display: block; margin-bottom: 4px; }
.pagenav a .pg { font-size: 14px; color: var(--foreground); }
.pagenav a.next { text-align: right; margin-left: auto; }

/* Footer */
.footer {
  border-top: 1px solid var(--card-border);
  margin-top: 80px;
  padding: 28px 0 8px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted-2);
  font-size: 13px;
}
.footer a { color: var(--muted); }
.footer a:hover { color: var(--foreground); }

/* Edit / GitHub banner strip on home */
.banner {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 14px 18px;
  margin: 26px 0;
  font-size: 13.5px;
}
.banner .dot { width: 8px; height: 8px; border-radius: 50%; background: #7fae8f; flex-shrink: 0; }

/* Hero (home) */
.hero { padding: 40px 0 8px; }
.hero h1 {
  font-family: var(--serif);
  font-size: 54px;
  line-height: 1.1;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}
.hero .lede { font-size: 19px; color: var(--muted); max-width: 780px; margin: 0 0 32px; }
.hero-btns { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--border-strong);
  background: var(--card-bg);
  color: var(--foreground);
  transition: all 0.15s;
}
.btn:hover { border-color: var(--foreground); }
.btn.primary { background: var(--foreground); color: var(--bg); border-color: var(--foreground); }
.btn.primary:hover { opacity: 0.9; }

/* Repo row */
.repo-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
}
.repo-row .rname { font-size: 14px; font-weight: 600; color: var(--foreground); }
.repo-row .rdesc { font-size: 12.5px; color: var(--muted); margin-top: 3px; }
.repo-row .rlang { font-family: var(--mono); font-size: 11px; color: var(--muted-2); }

/* Mobile menu button */
.menu-btn { display: none; }

/* Scroll-to-top */
#toTop {
  position: fixed;
  bottom: 24px; right: 24px;
  width: 42px; height: 42px;
  border-radius: 10px;
  background: var(--card-bg);
  border: 1px solid var(--border-strong);
  color: var(--foreground);
  font-size: 18px;
  cursor: pointer;
  z-index: 150;
  display: none;
  align-items: center;
  justify-content: center;
}
#toTop.show { display: flex; }
#toTop:hover { background: var(--card-bg-hover); }

/* Responsive */
@media (max-width: 1000px) {
  .sidebar { transform: translateX(-100%); transition: transform 0.22s ease; }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; }
  .menu-btn { display: flex; }
  .topbar .links .hide-sm { display: none; }
  .content { padding: 40px 22px 100px; }
  .hero h1 { font-size: 36px; }
  .page-head h1 { font-size: 32px; }
}