/* Q+ docs site — self-contained styles, no third-party runtime. */
:root {
  --bg: #0f1419;
  --panel: #161c24;
  --panel-2: #1c242e;
  --border: #2a3542;
  --text: #e6edf3;
  --muted: #93a4b5;
  --accent: #4cc2ff;
  --accent-2: #8b5cf6;
  --code-bg: #0b1017;
  --ok: #3fb950;
  --radius: 10px;
  --sidebar: 280px;
  --toc: 220px;
  --font: "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", "Fira Code", "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

/* topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 24px;
  background: rgba(15, 20, 25, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
  letter-spacing: 0.5px;
}
.brand span { color: var(--accent); }
.topbar-links { display: flex; align-items: center; gap: 18px; }
.topbar-links a { color: var(--muted); font-size: 14px; }
.topbar-links a:hover, .topbar-links a.active { color: var(--text); text-decoration: none; }
.topbar-links .playground-link {
  color: #08131c;
  background: linear-gradient(135deg, var(--accent), #7bd7ff);
  padding: 6px 14px;
  border-radius: 999px;
  font-weight: 600;
}
.topbar-links .playground-link:hover { filter: brightness(1.08); }

/* shell: sidebar + content (+ toc) */
.shell {
  display: grid;
  grid-template-columns: var(--sidebar) minmax(0, 1fr);
  max-width: 1500px;
  margin: 0 auto;
  gap: 0;
}
.shell:has(.toc) {
  grid-template-columns: var(--sidebar) minmax(0, 1fr) var(--toc);
}
.sidebar {
  position: sticky;
  top: 57px;
  align-self: start;
  max-height: calc(100vh - 57px);
  overflow-y: auto;
  padding: 20px 16px 40px;
  border-right: 1px solid var(--border);
}
.nav-home {
  display: block;
  padding: 8px 12px;
  margin-bottom: 14px;
  border-radius: 8px;
  color: var(--text);
  font-weight: 600;
}
.nav-home:hover, .nav-home.active { background: var(--panel-2); text-decoration: none; }
.nav-group { margin-bottom: 18px; }
.nav-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 6px 12px;
}
.nav-link {
  display: block;
  padding: 5px 12px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
}
.nav-link:hover { color: var(--text); background: var(--panel); text-decoration: none; }
.nav-link.active { color: var(--accent); background: var(--panel-2); font-weight: 600; }

.content {
  padding: 34px 44px 80px;
  min-width: 0;
  max-width: 980px;
}
.toc {
  position: sticky;
  top: 57px;
  align-self: start;
  max-height: calc(100vh - 57px);
  overflow-y: auto;
  padding: 34px 20px 40px 0;
  font-size: 13px;
}
.toc-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 8px;
}
.toc a { display: block; color: var(--muted); padding: 3px 0 3px 10px; border-left: 1px solid var(--border); }
.toc a:hover { color: var(--text); text-decoration: none; }
.toc-h3 { padding-left: 22px !important; }

/* content typography */
.content h1 { font-size: 2rem; line-height: 1.25; margin: 0 0 18px; }
.content h2 {
  font-size: 1.45rem;
  margin: 44px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 74px;
}
.content h3 { font-size: 1.15rem; margin: 30px 0 10px; scroll-margin-top: 74px; }
.content h4 { font-size: 1rem; margin: 22px 0 8px; color: var(--muted); }
.content p { margin: 12px 0; }
.content ul, .content ol { margin: 12px 0; padding-left: 26px; }
.content li { margin: 5px 0; }
.content li > ul, .content li > ol { margin: 4px 0; }
.content blockquote {
  margin: 16px 0;
  padding: 10px 16px;
  border-left: 3px solid var(--accent-2);
  background: var(--panel);
  border-radius: 0 8px 8px 0;
  color: var(--muted);
}
.content hr { border: 0; border-top: 1px solid var(--border); margin: 30px 0; }
.content img { max-width: 100%; border-radius: 8px; }
.content strong { color: #fff; }
.unresolved-link {
  color: var(--muted);
  border-bottom: 1px dotted var(--border);
  cursor: help;
}
.content code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 1px 5px;
  border-radius: 5px;
}
.content pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
  line-height: 1.55;
  margin: 16px 0;
}
.content pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: 13.5px;
  color: #c9d7e4;
  white-space: pre;
}

/* tables */
.table-wrap { overflow-x: auto; margin: 18px 0; border: 1px solid var(--border); border-radius: var(--radius); }
.content table { border-collapse: collapse; width: 100%; font-size: 14.5px; }
.content th, .content td { padding: 9px 14px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.content thead th { background: var(--panel-2); color: var(--text); font-weight: 600; }
.content tbody tr:last-child td { border-bottom: 0; }
.content tbody tr:nth-child(even) { background: rgba(255, 255, 255, 0.015); }

/* index page */
.content.index { max-width: 1080px; }
.hero { padding: 40px 0 22px; }
.hero h1 {
  font-size: 2.7rem;
  margin: 0 0 14px;
  background: linear-gradient(120deg, #fff, var(--accent) 60%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.subtitle { color: var(--muted); font-size: 1.05rem; max-width: 760px; }
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 6px; }
.badge {
  font-size: 12.5px;
  color: var(--muted);
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 999px;
  padding: 3px 11px;
}
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0 10px; }
.button {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-weight: 600;
  font-size: 14.5px;
}
.button:hover { border-color: var(--accent); text-decoration: none; }
.button.primary {
  background: linear-gradient(135deg, var(--accent), #7bd7ff);
  border-color: transparent;
  color: #08131c;
}
.button.primary:hover { filter: brightness(1.06); }
.button.ghost { color: var(--muted); border-style: dashed; }
.note {
  margin: 26px 0 10px;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--panel);
  color: var(--muted);
  font-size: 14.5px;
}
.note code { color: var(--text); }
.card-group { margin: 30px 0; }
.card-group h2 { border: 0; margin: 0 0 14px; padding: 0; font-size: 1.2rem; }
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}
.card {
  display: block;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.15s, transform 0.15s;
}
.card:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-1px); }
.card-title { color: var(--text); font-weight: 600; font-size: 14.5px; }
.card-path { color: var(--muted); font-family: var(--mono); font-size: 12px; margin-top: 4px; }

/* footer */
.footer {
  max-width: 1500px;
  margin: 0 auto;
  padding: 26px 24px 40px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

/* syntax highlight tokens (assets/highlight.js) */
.tok-kw { color: #ff7b72; }
.tok-str { color: #a5d6ff; }
.tok-num { color: #79c0ff; }
.tok-com { color: #6e7f90; font-style: italic; }
.tok-fn { color: #d2a8ff; }
.tok-type { color: #7ee787; }

/* responsive */
@media (max-width: 1100px) {
  .shell, .shell:has(.toc) { grid-template-columns: var(--sidebar) minmax(0, 1fr); }
  .toc-wrap { display: none; }
}
@media (max-width: 820px) {
  .shell, .shell:has(.toc) { display: block; }
  .sidebar {
    position: static;
    max-height: none;
    border-right: 0;
    border-bottom: 1px solid var(--border);
    padding: 14px 16px;
  }
  .nav-group { display: inline-block; vertical-align: top; margin: 0 18px 10px 0; }
  .content { padding: 24px 18px 60px; }
  .hero h1 { font-size: 2rem; }
}