/* QSDM Docs — knowledge-base SPA.
 *
 * Three-column layout on desktop (sidebar | content | optional outline),
 * collapses to single-column on mobile with a slide-in sidebar.
 * Visual language matches the QSDM landing page:
 *   --accent  = NVIDIA green (#76b900)
 *   --accent-2= QSDM teal   (#00d1b2)
 *   dark blue background, slate panels, cool-gray copy.
 */

:root {
  --bg: #0a101d;
  --bg-2: #0f172a;
  --panel: #0e1729;
  --panel-2: #131e36;
  --border: #1f2a44;
  --border-2: #283454;
  --text: #e6edf7;
  --text-2: #b8c4d8;
  --muted: #7d8aa4;
  --accent: #76b900;
  --accent-2: #00d1b2;
  --accent-3: #6ea8ff;
  --code-bg: #0a1224;
  --code-fg: #d9e2f1;
  --radius: 10px;
  --radius-sm: 6px;
  --header-h: 56px;
  --sidebar-w: 280px;
  --maxw-content: 920px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "Inter", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent-3); text-decoration: none; }
a:hover { color: var(--accent-2); text-decoration: underline; }

.skip-link {
  position: absolute; left: -9999px;
  background: var(--accent); color: #0b1220;
  padding: 8px 12px; border-radius: var(--radius-sm);
  z-index: 1000; font-weight: 600;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- header ---------- */

.docs-header {
  position: sticky; top: 0; z-index: 50;
  height: var(--header-h);
  background: rgba(10, 16, 29, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.docs-header-inner {
  display: flex; align-items: center; gap: 16px;
  height: 100%;
  padding: 0 18px;
}
.docs-brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--text); text-decoration: none;
  font-weight: 600;
  flex-shrink: 0;
}
.docs-brand:hover { text-decoration: none; }
.docs-brand-text strong { color: var(--text); letter-spacing: .02em; }
.docs-brand-text em { color: var(--muted); font-style: normal; margin-left: 4px; font-weight: 500; }
.docs-search-wrap { flex: 1; display: flex; justify-content: center; }
#docsSearch {
  width: 100%; max-width: 380px;
  background: var(--panel); color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 12px; font-size: 14px;
  outline: none;
}
#docsSearch::placeholder { color: var(--muted); }
#docsSearch:focus { border-color: var(--accent-2); }
.docs-header-right { display: flex; align-items: center; gap: 12px; }
.docs-pill {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--panel); border: 1px solid var(--border-2);
  border-radius: 999px; padding: 4px 10px; font-size: 12px;
  color: var(--text-2); font-weight: 500; text-decoration: none;
}
.docs-pill:hover { border-color: var(--accent-2); color: var(--text); text-decoration: none; }
.docs-pill .dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.docs-link { font-size: 14px; color: var(--text-2); }
.docs-link:hover { color: var(--text); text-decoration: none; }
.docs-sidebar-toggle {
  display: none;
  background: transparent; border: 1px solid var(--border); color: var(--text-2);
  border-radius: var(--radius-sm); padding: 6px;
  cursor: pointer;
}
.docs-sidebar-toggle:hover { color: var(--text); border-color: var(--border-2); }

/* ---------- layout ---------- */

.docs-layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  gap: 0;
  min-height: calc(100vh - var(--header-h));
}

/* ---------- sidebar ---------- */

.docs-sidebar {
  position: sticky; top: var(--header-h);
  align-self: start;
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  background: var(--bg-2);
  border-right: 1px solid var(--border);
  padding: 18px 8px 28px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-2) transparent;
}
.docs-sidebar::-webkit-scrollbar { width: 8px; }
.docs-sidebar::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 4px; }
.docs-sidebar::-webkit-scrollbar-track { background: transparent; }

.docs-nav { display: flex; flex-direction: column; gap: 2px; }
.nav-section {
  margin: 6px 0 2px;
  padding: 0 10px;
}
.nav-section-title {
  text-transform: uppercase;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--muted);
  padding: 12px 6px 4px;
}
.nav-item {
  display: block;
  padding: 6px 10px;
  margin: 0 4px;
  color: var(--text-2);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  line-height: 1.4;
}
.nav-item:hover {
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
}
.nav-item.active {
  background: var(--panel-2);
  color: var(--text);
  font-weight: 600;
  border-left: 2px solid var(--accent-2);
  padding-left: 12px;
}
.nav-item .badge {
  display: inline-block;
  background: var(--panel-2);
  color: var(--accent);
  border-radius: 999px;
  font-size: 10px;
  padding: 1px 7px;
  margin-left: 6px;
  vertical-align: middle;
  letter-spacing: .03em;
  font-weight: 600;
}
.nav-item .badge.new { color: var(--accent); }
.nav-item .badge.beta { color: var(--accent-3); }
.nav-item.hidden { display: none; }
.nav-section.hidden { display: none; }

.docs-sidebar-foot {
  margin: 20px 14px 0;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
}

/* ---------- main / content ---------- */

.docs-main {
  display: flex; flex-direction: column;
  padding: 36px 40px 80px;
  min-width: 0;
}
.markdown-body {
  width: 100%;
  max-width: var(--maxw-content);
  margin: 0;
  color: var(--text);
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  color: var(--text);
  line-height: 1.25;
  margin: 1.4em 0 0.6em;
  font-weight: 700;
}
.markdown-body h1 {
  font-size: 30px;
  margin-top: 0;
  letter-spacing: -0.01em;
  border-bottom: 1px solid var(--border);
  padding-bottom: 14px;
}
.markdown-body h2 {
  font-size: 22px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
  margin-top: 2em;
}
.markdown-body h3 { font-size: 18px; }
.markdown-body h4 { font-size: 16px; color: var(--text-2); }
.markdown-body p { color: var(--text-2); margin: 0 0 14px; }
.markdown-body strong { color: var(--text); }
.markdown-body em { color: var(--text-2); }

.markdown-body a { color: var(--accent-2); text-decoration: none; word-break: break-word; }
.markdown-body a:hover { text-decoration: underline; }

.markdown-body ul, .markdown-body ol { color: var(--text-2); padding-left: 22px; margin: 0 0 14px; }
.markdown-body li { margin: 4px 0; }
.markdown-body li > p { margin: 0 0 6px; }

.markdown-body blockquote {
  margin: 14px 0;
  padding: 10px 14px;
  background: var(--panel);
  border-left: 3px solid var(--accent-2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-2);
}
.markdown-body blockquote p:last-child { margin-bottom: 0; }

.markdown-body code {
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  color: var(--code-fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
}
.markdown-body pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  overflow-x: auto;
  margin: 14px 0;
  position: relative;
  scrollbar-width: thin;
  scrollbar-color: var(--border-2) transparent;
}
.markdown-body pre::-webkit-scrollbar { height: 8px; }
.markdown-body pre::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 4px; }
.markdown-body pre code {
  background: transparent;
  border: 0;
  padding: 0;
  font-size: 13.5px;
  line-height: 1.55;
}
.copy-btn {
  position: absolute;
  top: 8px; right: 8px;
  background: var(--panel);
  border: 1px solid var(--border-2);
  color: var(--text-2);
  border-radius: var(--radius-sm);
  font-size: 11.5px;
  padding: 3px 8px;
  cursor: pointer;
  opacity: 0;
  transition: opacity .12s ease;
}
.markdown-body pre:hover .copy-btn,
.copy-btn:focus { opacity: 1; }
.copy-btn:hover { color: var(--text); border-color: var(--accent-2); }
.copy-btn.copied { color: var(--accent); border-color: var(--accent); }

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  font-size: 14px;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
.markdown-body th {
  background: var(--panel-2);
  color: var(--text);
  font-weight: 700;
}
.markdown-body td { color: var(--text-2); }
.markdown-body tr:nth-child(even) td { background: rgba(255, 255, 255, .015); }

.markdown-body hr {
  border: 0; height: 1px;
  background: var(--border);
  margin: 28px 0;
}

.markdown-body img {
  max-width: 100%; height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

/* ---------- doc states ---------- */

.doc-loading,
.doc-error,
.doc-welcome {
  padding: 32px 0;
  color: var(--text-2);
}
.doc-loading { color: var(--muted); font-style: italic; }
.doc-error {
  background: var(--panel);
  border: 1px solid #5b2933;
  border-left: 3px solid #ff6b6b;
  border-radius: var(--radius-sm);
  padding: 18px 22px;
}
.doc-error h2 { margin-top: 0; }
.doc-welcome h1 { margin-top: 0; }
.welcome-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 18px;
}
.welcome-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}
.welcome-card h3 { margin-top: 0; font-size: 17px; }
.welcome-card p { font-size: 14px; }
.welcome-card a { display: inline-block; font-size: 14px; font-weight: 600; }

.docs-foot {
  width: 100%;
  max-width: var(--maxw-content);
  margin: 48px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}

/* ---------- responsive ---------- */

@media (max-width: 980px) {
  .docs-sidebar-toggle { display: inline-flex; }
  .docs-search-wrap { display: none; }
  .docs-link { display: none; }
  .docs-layout { grid-template-columns: 1fr; }
  .docs-sidebar {
    position: fixed;
    top: var(--header-h);
    left: 0;
    width: min(86vw, 320px);
    height: calc(100vh - var(--header-h));
    transform: translateX(-100%);
    transition: transform .18s ease;
    z-index: 40;
    box-shadow: 4px 0 20px rgba(0,0,0,.4);
  }
  .docs-sidebar.open { transform: translateX(0); }
  .docs-main { padding: 26px 22px 60px; }
}
@media (max-width: 480px) {
  .docs-brand-text em { display: none; }
  .docs-pill { display: none; }
  .markdown-body h1 { font-size: 24px; }
}