:root {
  --bg: #0d1117;
  --bg-soft: #131a24;
  --panel: #161d29;
  --border: #243044;
  --text: #d5dbe6;
  --muted: #8794a8;
  --heading: #f2f5fa;
  --accent: #5bc0de;
  --accent-2: #8b7cf6;
  --accent-soft: rgba(91, 192, 222, 0.12);
  --code-bg: #0a0e14;
  --radius: 12px;
  --header-h: 64px;
  --sidebar-w: 270px;
  --toc-w: 220px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 "Inter", system-ui, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50; height: var(--header-h);
  display: flex; align-items: center; gap: 16px; padding: 0 24px;
  background: rgba(13, 17, 23, 0.85); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.brand img { height: 38px; display: block; }
.header-links { margin-left: auto; display: flex; gap: 6px; align-items: center; }
.header-links a {
  color: var(--text); padding: 6px 12px; border-radius: 8px; font-size: .9rem;
}
.header-links a:hover { background: var(--panel); text-decoration: none; }
.header-links a.cta {
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #07111c; font-weight: 600;
}
.menu-btn {
  display: none; background: none; border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 6px 10px; font-size: 1.1rem; cursor: pointer;
}

/* Layout */
.layout { display: flex; max-width: 1480px; margin: 0 auto; }
.sidebar {
  width: var(--sidebar-w); flex-shrink: 0; position: sticky; top: var(--header-h);
  height: calc(100vh - var(--header-h)); overflow-y: auto; padding: 24px 16px 40px 24px;
  border-right: 1px solid var(--border);
}
.sidebar h4 {
  margin: 22px 0 6px; font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted);
}
.sidebar h4:first-child { margin-top: 0; }
.sidebar a {
  display: block; padding: 5px 12px; border-radius: 8px; color: var(--text); font-size: .93rem;
}
.sidebar a.sub { margin-left: 14px; color: var(--muted); }
.sidebar a:hover { background: var(--panel); text-decoration: none; }
.sidebar a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

main { flex: 1; min-width: 0; padding: 40px 48px 80px; }
article { max-width: 820px; }
.toc-col {
  width: var(--toc-w); flex-shrink: 0; position: sticky; top: var(--header-h);
  height: calc(100vh - var(--header-h)); overflow-y: auto; padding: 40px 16px 0 0; font-size: .85rem;
}
.toc-col h4 { margin: 0 0 8px; font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.toc-col ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--border); }
.toc-col li a { display: block; padding: 3px 12px; color: var(--muted); overflow-wrap: anywhere; }
.toc-col li a:hover { color: var(--accent); text-decoration: none; }
.toc-col li li a { padding-left: 24px; }
.toc-col li ul { border-left: 0; }

/* Content */
article h1 {
  margin: 0 0 .6em; font-size: 2.3rem; line-height: 1.2; color: var(--heading);
  background: linear-gradient(135deg, #fff 30%, var(--accent)); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
article h2 {
  margin: 2.2em 0 .6em; padding-bottom: .3em; font-size: 1.6rem; color: var(--heading);
  border-bottom: 1px solid var(--border);
}
article h3 { margin: 1.8em 0 .4em; font-size: 1.2rem; color: var(--heading); }
article h4 { margin: 1.4em 0 .3em; color: var(--heading); }
article h2 code, article h3 code { font-size: .85em; }
article p, article li { color: var(--text); }
article hr { border: 0; border-top: 1px solid var(--border); margin: 2em 0; }
article blockquote {
  margin: 1.2em 0; padding: .6em 1.2em; border-left: 4px solid var(--accent-2);
  background: var(--bg-soft); border-radius: 0 var(--radius) var(--radius) 0; color: var(--muted);
}
code {
  font-family: "JetBrains Mono", "Cascadia Code", Consolas, monospace; font-size: .88em;
  background: var(--panel); border: 1px solid var(--border); padding: .12em .4em; border-radius: 6px;
}
pre, .codehilite {
  background: var(--code-bg) !important; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px; overflow-x: auto; margin: 1.2em 0; line-height: 1.55;
}
.codehilite pre { margin: 0; padding: 0; border: 0; background: none !important; }
pre code, .codehilite code { background: none; border: 0; padding: 0; font-size: .86rem; }
.table-wrap { overflow-x: auto; margin: 1.2em 0; border: 1px solid var(--border); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: .92rem; }
th, td { padding: 9px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--border); }
th { background: var(--panel); color: var(--heading); font-weight: 600; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: rgba(255, 255, 255, 0.02); }
.headerlink { opacity: 0; margin-left: .4em; font-size: .8em; }
h2:hover .headerlink, h3:hover .headerlink { opacity: .6; }

.page-nav { display: flex; gap: 16px; margin-top: 64px; }
.page-nav a {
  flex: 1; padding: 16px 20px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-soft); color: var(--heading);
}
.page-nav a:hover { border-color: var(--accent); text-decoration: none; }
.page-nav small { display: block; color: var(--muted); }
.page-nav .next { text-align: right; }
.site-footer { text-align: center; padding: 32px 16px; color: var(--muted); font-size: .85rem; border-top: 1px solid var(--border); }

/* Landing page */
.hero {
  position: relative; overflow: hidden; text-align: center; padding: 88px 24px 72px;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(91, 192, 222, 0.18), transparent 55%),
    radial-gradient(ellipse at 85% 20%, rgba(139, 124, 246, 0.16), transparent 50%);
}
.hero img.logo { height: 96px; }
.hero .badge {
  display: inline-block; margin-top: 20px; padding: 4px 14px; border-radius: 999px; font-size: .8rem;
  border: 1px solid var(--border); background: var(--panel); color: var(--muted);
}
.hero p.lead { max-width: 720px; margin: 20px auto 0; font-size: 1.2rem; color: var(--text); }
.hero .note { max-width: 640px; margin: 12px auto 0; color: var(--muted); font-size: .95rem; }
.btn-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 32px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; padding: 12px 26px; border-radius: 10px;
  font-weight: 600; border: 1px solid var(--border);
  color: var(--heading); background: var(--panel);
}
.btn:hover { text-decoration: none; border-color: var(--accent); }
.btn.primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #07111c; border: 0; }
.drop-link {
  display: inline-flex; align-items: center; gap: 10px; margin: 4px 8px 4px 0; padding: 10px 20px; border-radius: 12px;
  border: 2px dashed var(--accent); background: var(--accent-soft); color: var(--accent); font-weight: 600; cursor: grab;
  transition: background .15s, box-shadow .15s, transform .15s;
}
.drop-link:hover {
  background: rgba(91, 192, 222, 0.2); box-shadow: 0 0 0 4px rgba(91, 192, 222, 0.08); text-decoration: none;
  transform: translateY(-1px);
}
.drop-link::before {
  content: ""; width: 1.15em; height: 1.15em; flex: none; background: currentColor;
  -webkit-mask: url("img/move.svg") center / contain no-repeat; mask: url("img/move.svg") center / contain no-repeat;
}
.drop-link.large { padding: 14px 30px; font-size: 1.05rem; background: rgba(91, 192, 222, 0.16); color: var(--heading); }
.drop-link.subtle { border: 1px dashed #3b4f6b; background: transparent; color: var(--text); }
.drop-link.subtle:hover { border-color: var(--accent); color: var(--accent); }
.drop-stack { display: grid; gap: 14px; margin: 1.4em 0; }
.drop-row {
  display: grid; grid-template-columns: 330px 1fr; gap: 6px 18px; align-items: center; padding: 16px 18px;
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--panel);
}
.drop-row .drop-link { margin: 0; grid-column: 1; justify-content: flex-start; }
.drop-row .tag {
  grid-column: 1 / -1; font-size: .7rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted);
}
.drop-row p { grid-column: 2; margin: 0; color: var(--muted); font-size: .92rem; }
.drop-row.required { border-color: var(--accent); background: linear-gradient(135deg, var(--accent-soft), transparent); }
.drop-row.required .tag { color: var(--accent); }
.drop-row.recommended .tag { color: var(--accent-2); }
@media (max-width: 700px) { .drop-row { grid-template-columns: 1fr; } .drop-row p { grid-column: 1; } }
.landing { max-width: 1100px; margin: 0 auto; padding: 0 24px 80px; }
.landing section { margin-top: 72px; }
.landing h2 { font-size: 1.7rem; color: var(--heading); margin: 0 0 .5em; }
.showcase { margin-top: -8px; }
.showcase img { width: 100%; border-radius: 16px; border: 1px solid var(--border); box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5); }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin-top: 20px; }
.card {
  display: block; padding: 22px; border-radius: var(--radius); border: 1px solid var(--border);
  background: var(--bg-soft); color: var(--text); transition: transform .15s, border-color .15s;
}
.card:hover { transform: translateY(-3px); border-color: var(--accent); text-decoration: none; }
.card h3 { margin: 0 0 6px; color: var(--heading); font-size: 1.1rem; }
.card p { margin: 0; color: var(--muted); font-size: .92rem; }
.support .card:first-child { border-color: #3a3f7a; background: linear-gradient(135deg, #1c2038, var(--panel)); }
.support .card:first-child:hover { border-color: var(--accent-2); }
.ico { display: block; width: 28px; height: 28px; margin-bottom: 12px; background: var(--accent);
  -webkit-mask: center / contain no-repeat; mask: center / contain no-repeat; }
.support .card:first-child .ico { background: var(--accent-2); }
.ico-chat { -webkit-mask-image: url("img/chat.svg"); mask-image: url("img/chat.svg"); }
.ico-bug { -webkit-mask-image: url("img/bug.svg"); mask-image: url("img/bug.svg"); }
.ico-idea { -webkit-mask-image: url("img/idea.svg"); mask-image: url("img/idea.svg"); }
.thanks ul { list-style: none; display: grid; gap: 12px; margin: 16px 0 0; padding: 0; }
.thanks li { margin: 0; }
.thanks p { margin: 0; padding: 14px 18px; background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); }
.banner img { width: 100%; border-radius: 16px; }

@media (max-width: 1200px) { .toc-col { display: none; } }
@media (max-width: 900px) {
  .menu-btn { display: block; }
  .sidebar {
    position: fixed; left: 0; top: var(--header-h); z-index: 40; background: var(--bg); width: 280px;
    transform: translateX(-100%); transition: transform .2s;
  }
  body.nav-open .sidebar { transform: none; }
  main { padding: 28px 20px 60px; }
  .header-links a:not(.cta) { display: none; }
  .hero { padding-top: 56px; }
}