:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #657089;
  --line: #dce2eb;
  --surface: #fff;
  --soft: #f5f7fb;
  --accent: #335dff;
  --shadow: 0 8px 28px rgba(24, 37, 64, .08);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; overflow: hidden; color: var(--ink); background: var(--soft); font: 15px/1.6 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
.topbar { position: fixed; inset: 0 0 auto; z-index: 3; height: 64px; display: flex; align-items: center; justify-content: space-between; padding: 0 16px; background: var(--surface); border-bottom: 1px solid var(--line); font-family: "Avenir Next", Avenir, "Trebuchet MS", "Segoe UI", sans-serif; }
.brand { display: flex; min-width: 0; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; }
.brand img { width: 48px; height: 48px; flex: 0 0 auto; object-fit: contain; }
.brand-copy { display: block; min-width: 0; }
.brand-title { display: block; color: var(--muted); font-size: 12px; font-weight: 600; line-height: 16px; letter-spacing: .16em; text-transform: uppercase; }
.brand-subtitle { display: block; overflow: hidden; color: var(--ink); font-size: 14px; font-weight: 600; line-height: 20px; text-overflow: ellipsis; white-space: nowrap; }
.top-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.icon-button { display: inline-flex; align-items: center; justify-content: center; border: 0; background: transparent; color: var(--muted); font-size: 24px; line-height: 1; text-decoration: none; cursor: pointer; border-radius: 8px; width: 40px; height: 40px; }
.info-button { border-radius: 999px; }
.icon-button svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 2; }
.icon-button:hover, .icon-button:focus { background: var(--soft); color: var(--accent); }
.layout { position: fixed; inset: 64px 0 0; display: grid; grid-template-columns: clamp(176px, 24vw, 280px) minmax(0, 1fr); min-height: 0; }
.sidebar { grid-column: 1; min-height: 0; padding: 28px 18px; border-right: 1px solid var(--line); background: var(--surface); overflow-y: auto; overscroll-behavior: contain; }
.eyebrow { color: var(--muted); font-size: 11px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.nav-group { margin: 14px 0; }
.nav-group-title { font-weight: 700; padding: 5px 12px; }
.nav-group-toggle { display: flex; width: 100%; align-items: center; justify-content: space-between; gap: 12px; border: 0; padding: 5px 12px; background: transparent; color: var(--ink); cursor: pointer; font: inherit; font-weight: 700; text-align: left; }
.nav-group-toggle:hover, .nav-group-toggle:focus-visible { border-radius: 7px; background: var(--soft); color: var(--accent); outline: none; }
.nav-group-icon { color: var(--muted); transition: transform .16s ease; }
.nav-group.is-expanded .nav-group-icon { transform: rotate(180deg); }
.nav-group-links { display: none; }
.nav-group:first-child .nav-group-links, .nav-group.is-expanded .nav-group-links { display: block; }
.nav-link { display: block; width: 100%; padding: 6px 12px; border: 0; border-radius: 7px; background: transparent; color: var(--muted); text-align: left; cursor: pointer; font: inherit; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-link:hover, .nav-link.active { background: #edf1ff; color: var(--accent); }
.content-shell { grid-column: 2; min-height: 0; width: 100%; overflow-y: auto; overscroll-behavior: contain; padding: 48px clamp(20px, 5vw, 72px); }
.content-shell > * { max-width: 1400px; margin-inline: auto; }
.welcome { max-width: 720px; margin: 12vh auto; }
.welcome h1 { font-size: clamp(34px, 5vw, 60px); line-height: 1.05; letter-spacing: -.04em; margin: 10px 0 20px; }
.welcome p:not(.eyebrow) { font-size: 18px; color: var(--muted); }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); overflow: auto; min-width: 0; }
.panel-title { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--line); font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.content-card-title { margin: 0; color: var(--ink); font-size: clamp(20px, 3vw, 28px); letter-spacing: -.02em; line-height: 1.2; text-transform: none; }
.markdown-link { display: inline-flex; flex: 0 0 auto; align-items: center; gap: 5px; border: 1px solid var(--line); border-radius: 6px; padding: 6px 10px; color: var(--accent); font-size: 12px; font-weight: 700; letter-spacing: 0; text-decoration: none; text-transform: none; }
.markdown-link:hover, .markdown-link:focus-visible { border-color: #b9c5ff; background: #edf1ff; outline: none; }
.rendered { padding: 22px 26px; }
.rendered h1, .rendered h2, .rendered h3 { line-height: 1.2; }
.rendered a { color: var(--accent); }
.rendered pre { padding: 16px; border-radius: 8px; background: #1b2333; color: #f7f9ff; overflow: auto; }
.rendered code { font-family: "SFMono-Regular", Consolas, monospace; }
.rendered :not(pre) > code { padding: 2px 5px; background: #edf1f7; border-radius: 4px; }
.rendered img { display: block; max-width: 100%; height: auto; }
.rendered-image-unavailable { border: 1px dashed var(--line); border-radius: 8px; padding: 16px; background: var(--soft); color: var(--muted); font-size: 13px; }
.rendered blockquote { border-left: 4px solid var(--accent); padding-left: 16px; color: var(--muted); }
.search-drawer { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 18px; margin-bottom: 28px; box-shadow: var(--shadow); }
.search-drawer label { display: block; font-weight: 700; margin-bottom: 8px; }
.search-row { display: flex; gap: 8px; }
.search-row input { flex: 1; border: 1px solid var(--line); border-radius: 7px; padding: 10px 12px; font: inherit; }
.search-row button { border: 0; border-radius: 7px; padding: 0 14px; background: var(--soft); color: var(--muted); cursor: pointer; }
.search-results { display: grid; gap: 5px; margin-top: 14px; }
.result { display: block; padding: 8px 10px; border-radius: 7px; color: var(--ink); text-decoration: none; }
.result:hover { background: var(--soft); }
.result small { display: block; color: var(--muted); }

@media (max-width: 800px) {
  .sidebar { padding: 16px 10px; }
  .content-shell { padding: 28px 18px; }
  .welcome { margin: 8vh auto; }
}

@media (max-width: 700px) {
  .topbar { padding-inline: 8px; }
}

@media (max-width: 520px) {
  .layout { grid-template-columns: 152px minmax(0, 1fr); }
  .sidebar { padding-inline: 6px; }
  .sidebar-heading, .nav-group-title, .nav-group-toggle, .nav-link { padding-inline: 8px; }
  .content-shell { padding: 22px 14px; }
  .top-actions { gap: 4px; }
  .icon-button { width: 36px; height: 36px; }
}

@media (max-width: 380px) {
  .brand-copy { display: none; }
}