/* SpeakerOps Learn — docs layout: left sidebar + article + optional TOC */
:root {
  --lumen-bg: #f4f5f7;
  --lumen-surface: #ffffff;
  --lumen-text: #1d1d1f;
  --lumen-text-secondary: #5c5c63;
  --lumen-border: rgba(0, 0, 0, 0.08);
  --lumen-brand: #4f46e5;
  --lumen-brand-soft: #eef2ff;
  --lumen-radius-sm: 8px;
  --lumen-radius-md: 12px;
  --lumen-focus: #4f46e5;
  --lumen-focus-ring: 0 0 0 3px rgba(79, 70, 229, 0.35);
  --lumen-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --sidebar-w: 280px;
  --toc-w: 220px;
}
*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: light; scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--lumen-font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--lumen-text);
  background: var(--lumen-bg);
}
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--lumen-brand); color: #fff;
  padding: 8px 12px; border-radius: var(--lumen-radius-sm); z-index: 100;
}
.skip-link:focus { left: 8px; top: 8px; }

/* Shell: sidebar | primary */
.learn-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: 100vh;
  align-items: stretch;
}
.learn-sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  background: var(--lumen-surface);
  border-right: 1px solid var(--lumen-border);
  padding: 20px 16px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.sidebar-brand { padding: 0 4px; }
.brand {
  font-weight: 700; font-size: 1.05rem; color: var(--lumen-brand); text-decoration: none;
  border-radius: var(--lumen-radius-sm); display: inline-block;
}
.sidebar-tagline {
  margin: 6px 0 0; font-size: 12px; color: var(--lumen-text-secondary); line-height: 1.4;
}
.search-form { width: 100%; }
.search-input {
  width: 100%; padding: 10px 12px; border: 1px solid var(--lumen-border);
  border-radius: var(--lumen-radius-md); background: var(--lumen-bg); color: var(--lumen-text);
  font: inherit;
}
.brand:focus-visible, .lumen-focusable:focus-visible, a:focus-visible, button:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--lumen-focus);
  outline-offset: 2px;
  box-shadow: var(--lumen-focus-ring);
}
.learn-nav { flex: 1; }
.nav-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
.nav-title { margin: 0; font-size: 11px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--lumen-text-secondary); }
.nav-group { margin-bottom: 18px; }
.nav-group-label {
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--lumen-text-secondary); margin: 0 0 8px; padding: 0 8px;
}
.learn-nav ul { list-style: none; margin: 0; padding: 0; }
.learn-nav a {
  color: var(--lumen-text); text-decoration: none; border-radius: 8px;
  display: block; padding: 7px 10px; font-size: 14px; line-height: 1.35;
}
.learn-nav a:hover { background: var(--lumen-brand-soft); color: var(--lumen-brand); }
.learn-nav a[aria-current="page"] {
  background: var(--lumen-brand-soft); color: var(--lumen-brand); font-weight: 600;
}
.nav-close { display: none; }
.nav-toggle, .btn {
  appearance: none; border: 1px solid var(--lumen-border); background: var(--lumen-brand-soft);
  color: var(--lumen-brand); border-radius: var(--lumen-radius-md); padding: 8px 14px;
  font: inherit; cursor: pointer;
}
.btn {
  background: var(--lumen-brand); color: #fff; border-color: var(--lumen-brand);
  border-radius: 10px; display: inline-block; text-decoration: none;
}
.btn:hover { filter: brightness(0.95); }

.learn-primary { display: flex; flex-direction: column; min-width: 0; min-height: 100vh; }
.learn-topbar {
  display: none;
  position: sticky; top: 0; z-index: 30;
  background: rgba(255,255,255,0.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--lumen-border);
  padding: 10px 16px; align-items: center; gap: 12px;
}
.topbar-crumb { margin: 0; font-size: 14px; font-weight: 600; color: var(--lumen-text-secondary); }

.learn-body-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--toc-w);
  gap: 0;
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}
.learn-main {
  min-width: 0;
  padding: 36px 40px 80px;
  max-width: 780px;
}
.learn-main article {
  background: var(--lumen-surface);
  border: 1px solid var(--lumen-border);
  border-radius: 16px;
  padding: 36px 40px 48px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}
.learn-main h1 { font-size: 1.85rem; line-height: 1.2; margin: 0 0 12px; letter-spacing: -0.02em; }
.learn-lead { color: var(--lumen-text-secondary); font-size: 1.08rem; margin: 0 0 28px; line-height: 1.55; }
.learn-section { margin-bottom: 36px; }
.learn-section h2 {
  font-size: 1.2rem; margin: 0 0 14px; padding-top: 8px;
  border-top: 1px solid var(--lumen-border); padding-top: 24px;
}
.learn-section:first-of-type h2 { border-top: 0; padding-top: 0; }
.learn-section p { margin: 0 0 14px; }
.learn-steps, .learn-bullets { margin: 0 0 16px; padding-left: 1.35rem; }
.learn-steps li, .learn-bullets li { margin: 0 0 8px; padding-left: 4px; }
.learn-code {
  margin: 0 0 18px; padding: 14px 16px;
  background: #0f172a; color: #e2e8f0;
  border-radius: var(--lumen-radius-md); overflow-x: auto;
  font-size: 13px; line-height: 1.5;
}
.learn-code code { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; white-space: pre; }
.learn-callout {
  margin: 0 0 18px; padding: 14px 16px;
  border-radius: var(--lumen-radius-md);
  border: 1px solid var(--lumen-border);
  background: var(--lumen-brand-soft);
}
.learn-callout--tip { border-left: 4px solid var(--lumen-brand); }
.learn-callout--warning { border-left: 4px solid #d97706; background: #fff7ed; }
.learn-callout--note { border-left: 4px solid #64748b; background: #f8fafc; }
.learn-callout p { margin: 0; }
.learn-table-wrap { overflow-x: auto; margin: 0 0 18px; }
.learn-table {
  width: 100%; border-collapse: collapse; font-size: 14px;
  background: var(--lumen-surface);
}
.learn-table th, .learn-table td {
  border: 1px solid var(--lumen-border); padding: 10px 12px; text-align: left; vertical-align: top;
}
.learn-table th { background: var(--lumen-brand-soft); color: var(--lumen-brand); font-weight: 600; }
.learn-muted { color: var(--lumen-text-secondary); font-size: 0.95rem; }
.learn-product-routes {
  background: var(--lumen-bg); border: 1px solid var(--lumen-border);
  border-radius: var(--lumen-radius-md); padding: 18px 20px; margin-top: 8px;
}
.learn-product-routes h2 { font-size: 1rem; margin: 0 0 10px; border: 0; padding: 0; }
.learn-product-routes code {
  font-size: 13px; background: var(--lumen-surface); padding: 2px 6px; border-radius: 4px;
  border: 1px solid var(--lumen-border);
}
.learn-toc {
  position: sticky; top: 24px; align-self: start;
  padding: 28px 16px 28px 8px;
  font-size: 13px;
}
.toc-label {
  margin: 0 0 10px; font-size: 11px; font-weight: 700; letter-spacing: 0.05em;
  text-transform: uppercase; color: var(--lumen-text-secondary);
}
.learn-toc ul { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--lumen-border); }
.learn-toc a {
  display: block; padding: 5px 0 5px 12px; color: var(--lumen-text-secondary);
  text-decoration: none; line-height: 1.35;
}
.learn-toc a:hover { color: var(--lumen-brand); }
.learn-footer {
  border-top: 1px solid var(--lumen-border); padding: 20px 40px; text-align: left;
  color: var(--lumen-text-secondary); font-size: 13px; margin-top: auto;
}
.search-results {
  position: fixed; left: calc(var(--sidebar-w) + 16px); top: 72px;
  width: min(420px, calc(100vw - var(--sidebar-w) - 48px));
  max-height: 60vh; overflow: auto; background: var(--lumen-surface);
  border: 1px solid var(--lumen-border); border-radius: var(--lumen-radius-md);
  box-shadow: 0 12px 32px rgba(0,0,0,0.1); padding: 12px; z-index: 50;
}
.search-results[hidden] { display: none !important; }
.search-results a { display: block; padding: 10px; border-radius: var(--lumen-radius-sm); color: var(--lumen-text); text-decoration: none; }
.search-results a:hover { background: var(--lumen-brand-soft); }
.search-results strong { color: var(--lumen-brand); }
.card-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); margin-top: 12px; }
.card {
  background: var(--lumen-bg); border: 1px solid var(--lumen-border);
  border-radius: var(--lumen-radius-md); padding: 18px; text-decoration: none; color: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.card:hover { border-color: var(--lumen-brand); box-shadow: 0 4px 14px rgba(79,70,229,0.08); }
.card h2 { font-size: 1.02rem; margin: 0 0 8px; color: var(--lumen-brand); }
.card p { margin: 0; color: var(--lumen-text-secondary); font-size: 0.92rem; }
.not-found { text-align: center; padding: 48px 16px; }

@media (max-width: 1100px) {
  .learn-body-row { grid-template-columns: minmax(0, 1fr); }
  .learn-toc { display: none; }
}
@media (max-width: 900px) {
  .learn-shell { grid-template-columns: 1fr; }
  .learn-sidebar {
    position: fixed; inset: 0 auto 0 0; width: min(var(--sidebar-w), 88vw);
    transform: translateX(-105%); transition: transform 0.2s ease; z-index: 60;
    box-shadow: 8px 0 24px rgba(0,0,0,0.12);
  }
  body.nav-open .learn-sidebar { transform: translateX(0); }
  body.nav-open::before {
    content: ""; position: fixed; inset: 0; background: rgba(15,23,42,0.4); z-index: 50;
  }
  .learn-topbar { display: flex; }
  .nav-close { display: inline-block; }
  .learn-main { padding: 20px 16px 64px; max-width: none; }
  .learn-main article { padding: 24px 20px 36px; border-radius: 12px; }
  .learn-footer { padding: 16px; }
  .search-results { left: 16px; right: 16px; width: auto; }
}