/* Palette + tokens shared with kilnx.org landing */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #09090b;
  --bg-elevated: #111113;
  --bg-subtle: #18181b;
  --border: #27272a;
  --border-hover: #3f3f46;
  --text: #fafafa;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --accent: #e64a19;
  --accent-glow: #ff6e40;
  --accent-subtle: rgba(230, 74, 25, 0.12);
  --font-sans: "Inter", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  --max-width: 72rem;
  --sidebar-width: 240px;
  --nav-height: 4rem;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover { color: var(--accent-glow); }

/* -- Nav (mirrors landing) -- */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  border-bottom: 1px solid rgba(39,39,42,0.5);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(9,9,11,0.8);
}
.nav-inner {
  margin: 0 auto; padding: 0 2rem;
  height: var(--nav-height); display: flex; align-items: center; gap: 2rem;
}
.nav-left, .nav-right { display: flex; align-items: center; gap: 1.5rem; }
.nav-links { flex: 1; justify-content: center; }
.nav-logo { display: flex; align-items: center; gap: 0.75rem; }
.nav-logo img:first-child { width: 28px; height: 28px; filter: invert(1); }
.nav-logo img:last-child { width: 80px; height: 18px; filter: invert(1); }
.nav-links { display: flex; align-items: center; gap: 1.5rem; }
.nav-links a, .nav-right a {
  font-size: 0.875rem; color: var(--text-secondary);
  transition: color 0.2s;
}
.nav-links a:hover, .nav-right a:hover,
.nav-links a.active { color: var(--text); }
.nav-icon-link { display: flex; align-items: center; gap: 0.5rem; }
.nav-icon-link svg { width: 1.25rem; height: 1.25rem; }
.nav-right a.btn-nav {
  padding: 0.5rem 1rem; font-size: 0.875rem; font-weight: 500;
  background: var(--text); color: var(--bg); border-radius: 0.5rem;
  transition: opacity 0.2s; border: none;
}
.nav-right a.btn-nav:hover { opacity: 0.9; color: var(--bg); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* -- Layout: sidebar + content (full viewport width) -- */
.layout {
  padding: calc(var(--nav-height) + 2rem) 2rem 4rem;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: 3rem;
}

.sidebar {
  font-size: 0.875rem;
  border-right: 1px solid var(--border);
  padding-right: 1.5rem;
  position: sticky;
  top: calc(var(--nav-height) + 2rem);
  align-self: start;
  max-height: calc(100vh - var(--nav-height) - 3rem);
  overflow-y: auto;
}

.sidebar h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 600;
}

.sidebar h3:first-child { margin-top: 0; }

.sidebar ul {
  list-style: none;
}

.sidebar li { margin: 0.125rem 0; }

.sidebar a {
  color: var(--text-secondary);
  display: block;
  padding: 0.25rem 0;
  line-height: 1.4;
}

.sidebar a:hover { color: var(--text); }

.sidebar a.current {
  color: var(--accent);
  font-weight: 500;
}

.content {
  min-width: 0;
}

/* -- Content typography -- */
.content h1 {
  font-size: 2.25rem;
  margin-top: 0;
  margin-bottom: 1rem;
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.content h2 {
  font-size: 1.5rem;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.content h3 {
  font-size: 1.15rem;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.content h4 {
  font-size: 1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.content p { margin: 1rem 0; color: var(--text-secondary); }
.content p:first-child { margin-top: 0; }

.content strong { color: var(--text); font-weight: 600; }
.content em { color: var(--text); }

.content code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-subtle);
  color: var(--accent-glow);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.content pre {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.55;
  margin: 1.25rem 0;
  font-family: var(--font-mono);
  color: var(--text);
}

.content pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  border: none;
  color: inherit;
  font-size: inherit;
}

.content blockquote {
  border-left: 3px solid var(--accent);
  background: var(--accent-subtle);
  padding: 0.75rem 1rem;
  margin: 1.25rem 0;
  color: var(--text);
  border-radius: 0 6px 6px 0;
}

.content blockquote p { margin: 0.25rem 0; color: var(--text-secondary); }

.content ul, .content ol { padding-left: 1.5rem; margin: 1rem 0; color: var(--text-secondary); }
.content li { margin: 0.35rem 0; }
.content li::marker { color: var(--text-muted); }

.content table {
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.content th, .content td {
  border-bottom: 1px solid var(--border);
  padding: 0.6rem 0.9rem;
  text-align: left;
  color: var(--text-secondary);
}

.content td:first-child code { white-space: nowrap; }

.content th {
  background: var(--bg-subtle);
  color: var(--text);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.content tr:last-child td { border-bottom: none; }

.content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

/* -- Index grid (landing of /kilnx/) -- */
.toc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
  padding: 0;
  list-style: none;
}

.toc-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  background: var(--bg-elevated);
  transition: border-color 0.2s;
}

.toc-card:hover { border-color: var(--border-hover); }

.toc-card h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.toc-card ul {
  padding-left: 0;
  list-style: none;
  margin: 0;
}

.toc-card li { margin: 0.25rem 0; }

.toc-card a {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.toc-card a:hover { color: var(--accent); }

/* -- Footer -- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 2rem;
}

.site-footer a { color: var(--text-secondary); }
.site-footer a:hover { color: var(--text); }

/* -- Responsive -- */
@media (max-width: 960px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .sidebar {
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding-right: 0;
    padding-bottom: 1.5rem;
    max-height: none;
  }
  .nav-links { display: none; }
}