:root {
  --bg: #0b0b0c;
  --panel: #121214;
  --panel-2: #18181b;
  --line: #27272a;
  --ink: #f4f4f5;
  --muted: #a1a1aa;
  --dim: #71717a;
  --accent: #7c6cff;
  --accent-2: #5865f2;
  --ok: #22c55e;
  --radius: 12px;
  --side: 260px;
  --toc: 220px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: #c4b5fd; }

/* Top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 56px;
  padding: 0 1rem 0 1.1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(11, 11, 12, 0.92);
  backdrop-filter: blur(12px);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: -0.02em;
  flex: 0 0 auto;
}
.brand img { border-radius: 7px; }
.search {
  flex: 1;
  max-width: 420px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  color: var(--dim);
}
.search input {
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
}
.search kbd {
  font-size: 0.7rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.1rem 0.35rem;
  color: var(--dim);
}
.top-actions {
  display: flex;
  gap: 0.55rem;
  margin-left: auto;
  align-items: center;
}
.btn-top {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
}
.btn-top.primary {
  background: var(--accent-2);
  border-color: transparent;
  color: #fff;
}
.menu-btn {
  display: none;
  appearance: none;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 8px;
  width: 36px;
  height: 36px;
  cursor: pointer;
}

/* Shell */
.shell {
  display: grid;
  grid-template-columns: var(--side) minmax(0, 1fr) var(--toc);
  min-height: calc(100vh - 56px);
}
.sidebar {
  position: sticky;
  top: 56px;
  height: calc(100vh - 56px);
  overflow: auto;
  padding: 1rem 0.75rem 2rem;
  border-right: 1px solid var(--line);
  background: var(--bg);
}
.nav-group { margin-bottom: 1.1rem; }
.nav-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--dim);
  padding: 0.35rem 0.65rem;
  margin-bottom: 0.2rem;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.42rem 0.55rem;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
}
.nav-link:hover { background: var(--panel); color: var(--ink); }
.nav-link.is-active {
  background: rgba(124, 108, 255, 0.12);
  color: #c4b5fd;
}
.nav-link .ico {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  opacity: 0.85;
}
.nav-link.is-active .ico { opacity: 1; color: var(--accent); }

.content {
  padding: 1.75rem clamp(1.1rem, 3vw, 2.4rem) 3rem;
  max-width: 820px;
  width: 100%;
  margin: 0 auto;
}
.crumb {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 650;
  color: var(--accent);
  margin-bottom: 0.55rem;
}
.page-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}
.page-head h1 {
  margin: 0;
  font-size: clamp(1.7rem, 3.5vw, 2.15rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.lede { color: var(--muted); margin: 0 0 1.35rem; max-width: 58ch; }

.path-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  margin-bottom: 1.5rem;
}
.path-box .path { color: var(--muted); font-size: 0.9rem; }
.path-box .path b { color: var(--ink); font-weight: 600; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  background: var(--accent-2);
  color: #fff !important;
  font-weight: 650;
  font-size: 0.88rem;
  border: 0;
}
.btn:hover { filter: brightness(1.08); color: #fff !important; }
.btn-ghost {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted) !important;
}

h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  scroll-margin-top: 80px;
}
h3 {
  margin: 1.25rem 0 0.45rem;
  font-size: 1.02rem;
  scroll-margin-top: 80px;
}
p { color: var(--muted); margin: 0 0 0.85rem; }
ul, ol { color: var(--muted); margin: 0 0 1rem; padding-left: 1.2rem; }
li { margin: 0.25rem 0; }
code {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.05rem 0.35rem;
  font-size: 0.88em;
}

/* Steps like GalaxyBot */
.steps { display: grid; gap: 1rem; margin: 1rem 0 1.5rem; }
.step {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 0.85rem;
  align-items: start;
}
.step-n {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  display: grid;
  place-items: center;
  font-weight: 700;
  color: var(--accent);
}
.step h3 { margin: 0.15rem 0 0.25rem; }

/* Module cards grid */
.mod-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
  margin: 1rem 0 1.5rem;
}
.mod-card {
  display: grid;
  gap: 0.45rem;
  padding: 1rem;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  color: inherit;
  transition: border-color 0.15s, background 0.15s;
}
.mod-card:hover {
  border-color: rgba(124, 108, 255, 0.45);
  background: var(--panel-2);
  color: inherit;
}
.mod-ico {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: rgba(124, 108, 255, 0.12);
  color: var(--accent);
}
.mod-ico svg { width: 18px; height: 18px; }
.mod-card strong { font-size: 0.95rem; letter-spacing: -0.01em; }
.mod-card span { color: var(--muted); font-size: 0.84rem; line-height: 1.4; }

.callout {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 0.9rem 1rem;
  margin: 1rem 0;
  color: var(--muted);
}
.callout strong { color: var(--ink); }

.related {
  display: grid;
  gap: 0.65rem;
  margin-top: 0.75rem;
}
.related a {
  display: block;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--panel);
  color: inherit;
}
.related a strong { display: block; color: var(--ink); margin-bottom: 0.2rem; }
.related a span { color: var(--muted); font-size: 0.86rem; }

/* TOC */
.toc {
  position: sticky;
  top: 56px;
  height: calc(100vh - 56px);
  overflow: auto;
  padding: 1.25rem 1rem 2rem 0.5rem;
  border-left: 1px solid var(--line);
}
.toc-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 0.55rem;
  padding-left: 0.55rem;
}
.toc a {
  display: block;
  color: var(--muted);
  font-size: 0.84rem;
  padding: 0.28rem 0.55rem;
  border-left: 2px solid transparent;
}
.toc a:hover, .toc a.is-active {
  color: var(--ink);
  border-left-color: var(--accent);
}
.toc-card {
  margin-top: 1.25rem;
  padding: 0.9rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--panel);
}
.toc-card .mini-ico {
  width: 28px; height: 28px; border-radius: 8px;
  display: grid; place-items: center;
  background: rgba(124, 108, 255, 0.15);
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.toc-card strong { display: block; font-size: 0.82rem; margin-bottom: 0.25rem; }
.toc-card p { font-size: 0.8rem; margin: 0 0 0.55rem; }
.toc-card a { font-size: 0.82rem; font-weight: 650; }

.foot-mini {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--dim);
  font-size: 0.82rem;
}
.foot-mini a { color: var(--dim); }
.foot-mini a:hover { color: var(--ink); }

.backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 30;
}

@media (max-width: 1100px) {
  .shell { grid-template-columns: var(--side) minmax(0, 1fr); }
  .toc { display: none; }
}
@media (max-width: 860px) {
  .menu-btn { display: inline-grid; place-items: center; }
  .search { display: none; }
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    left: 0; top: 56px; bottom: 0;
    width: min(300px, 88vw);
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    z-index: 35;
    border-right: 1px solid var(--line);
    box-shadow: 20px 0 40px rgba(0,0,0,0.35);
  }
  body.nav-open .sidebar { transform: translateX(0); }
  body.nav-open .backdrop { display: block; }
}