@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,400;0,14..32,500;0,14..32,600;0,14..32,700;1,14..32,400&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #0b0d12;
  --bg-subtle: #10141c;
  --surface: #161b26;
  --surface-2: #1e2533;
  --surface-hover: #252d3d;
  --border: #2a3344;
  --border-subtle: #1f2633;
  --text: #e8ecf3;
  --text-secondary: #b4bcc9;
  --muted: #8b95a8;
  --accent: #4f8ff7;
  --accent-soft: rgba(79, 143, 247, 0.12);
  --accent-2: #7eb0ff;
  --success: #3ecf8e;
  --success-soft: rgba(62, 207, 142, 0.1);
  --warning: #e8b339;
  --warning-soft: rgba(232, 179, 57, 0.1);
  --danger: #e85d5d;
  --code-bg: #0d1118;
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 48rem;
  --content-max: 52rem;
  --nav-width: 272px;
  --font: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "SF Mono", Consolas, monospace;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--font), sans-serif;
  font-size: 1rem;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.layout {
  display: grid;
  grid-template-columns: var(--nav-width) 1fr;
  min-height: 100vh;
}

/* ── Sidebar ── */

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  background: var(--surface);
  border-right: 1px solid var(--border-subtle);
  padding: 1.25rem 0.875rem;
  display: flex;
  flex-direction: column;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 0.2rem;
  text-decoration: none;
}

.brand:hover { text-decoration: none; color: var(--text); }

.brand::before {
  content: "S";
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.sidebar .brand[href*="hub"]::before,
.brand.hub::before { content: "H"; }

.brand-sub {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
  margin-bottom: 1.25rem;
  padding-left: 2.35rem;
}

.nav-section {
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 1rem 0 0.35rem;
  padding: 0 0.65rem;
}

.nav a {
  display: block;
  color: var(--muted);
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  border-left: 2px solid transparent;
  margin-left: 0.25rem;
  transition: background 0.12s, color 0.12s;
}

.nav a:hover {
  color: var(--text);
  background: var(--surface-hover);
  text-decoration: none;
}

.nav a.active {
  color: var(--accent-2);
  background: var(--accent-soft);
  border-left-color: var(--accent);
  text-decoration: none;
}

.sidebar-company {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.55;
}

.sidebar-company a {
  color: var(--accent-2);
  font-weight: 500;
}

/* ── Main content ── */

.content {
  padding: 2.5rem 3.5rem 5rem;
  max-width: calc(var(--content-max) + var(--nav-width) + 4rem);
}

.hero {
  margin-bottom: 2.75rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-subtle);
}

.hero h1 {
  font-size: 2.125rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
  margin: 0 0 0.85rem;
  max-width: 22ch;
}

.lead {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 42rem;
  line-height: 1.65;
  margin: 0;
}

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

.badges { margin: 1.25rem 0 0; display: flex; flex-wrap: wrap; gap: 0.4rem; }

.badges a, .badge {
  display: inline-block;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius);
  font-size: 0.75rem;
  font-weight: 500;
}

/* ── Typography ── */

h2 {
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 2.75rem 0 0.85rem;
  padding-top: 0.25rem;
  color: var(--text);
}

h2:first-of-type { margin-top: 0; }

h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin: 1.75rem 0 0.65rem;
  color: var(--text);
}

h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin: 1.25rem 0 0.5rem;
  color: var(--text-secondary);
}

p, ul, ol, .diagram, .callout, .company-callout, .toc {
  max-width: var(--max-width);
}

p { margin: 0 0 1rem; }

ul, ol {
  padding-left: 1.35rem;
  margin: 0 0 1rem;
}

li { margin: 0.4rem 0; }
li::marker { color: var(--muted); }

/* ── Cards ── */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.85rem;
  margin: 1.5rem 0 2rem;
  max-width: 100%;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.15rem 1.2rem;
  transition: border-color 0.15s;
}

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

.card h3 {
  margin: 0 0 0.45rem;
  font-size: 0.9375rem;
}

.card p {
  color: var(--muted);
  font-size: 0.875rem;
  margin: 0;
  line-height: 1.55;
}

/* ── Code ── */

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem 1.15rem;
  overflow-x: auto;
  font-family: var(--mono), monospace;
  font-size: 0.8125rem;
  line-height: 1.6;
  max-width: 100%;
  margin: 0 0 1.25rem;
  box-shadow: var(--shadow);
}

code {
  font-family: var(--mono), monospace;
  font-size: 0.84em;
  background: var(--surface-2);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  color: var(--text-secondary);
}

pre code {
  background: none;
  padding: 0;
  color: var(--text);
  font-size: inherit;
}

/* ── Tables ── */

.table-wrap {
  overflow-x: auto;
  margin: 1rem 0 1.5rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  max-width: 100%;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  margin: 0;
}

th, td {
  padding: 0.7rem 0.9rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border-subtle);
}

th {
  background: var(--surface-2);
  color: var(--muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

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

tbody tr:hover td { background: rgba(255, 255, 255, 0.02); }

/* Legacy: tables without wrapper still look ok */
table:not(.table-wrap table) {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 1rem 0 1.5rem;
}

/* ── Diagrams & callouts ── */

.diagram {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.15rem 1.25rem;
  font-family: var(--mono), monospace;
  font-size: 0.78rem;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre;
  color: var(--muted);
  margin: 0 0 1.25rem;
}

.callout {
  background: var(--accent-soft);
  border: 1px solid rgba(79, 143, 247, 0.22);
  border-radius: var(--radius-lg);
  padding: 1rem 1.15rem;
  margin: 1.5rem 0;
  font-size: 0.9375rem;
}

.callout strong { color: var(--accent-2); }

.callout.warn {
  background: var(--warning-soft);
  border-color: rgba(232, 179, 57, 0.25);
}

.callout.warn strong { color: var(--warning); }

.callout.success {
  background: var(--success-soft);
  border-color: rgba(62, 207, 142, 0.22);
}

.callout.success strong { color: var(--success); }

.company-callout {
  background: linear-gradient(135deg, rgba(79, 143, 247, 0.1), rgba(79, 143, 247, 0.03));
  border: 1px solid rgba(79, 143, 247, 0.2);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  margin: 0 0 2rem;
}

.company-callout strong {
  display: block;
  font-size: 0.9375rem;
  margin-bottom: 0.35rem;
  color: var(--text);
}

.company-callout p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.brand-sub a { color: var(--accent-2); }

.toc {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
}

.toc-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

.toc ul { margin: 0; padding-left: 1.2rem; }
.toc li { font-size: 0.875rem; }

.footer {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--muted);
  font-size: 0.85rem;
}

.footer-muted {
  margin-top: 0.35rem;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ── Responsive ── */

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }

  .sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }

  .content { padding: 1.5rem 1.25rem 3rem; }

  .hero h1 { font-size: 1.75rem; max-width: none; }

  .hero { padding-bottom: 1.5rem; }
}

@media (min-width: 1200px) {
  .content { padding-left: 4rem; }
}