:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --panel: #ffffff;
  --panel-border: #d9e0ea;
  --text: #172033;
  --muted: #627086;
  --brand: #2155d6;
  --brand-strong: #173da0;
  --accent: #17a673;
  --table-head: #eef3f9;
  --shadow: 0 16px 40px rgba(23, 32, 51, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

button {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--panel-border);
  min-height: 100vh;
  padding: 22px 18px;
  position: sticky;
  top: 0;
}

.brand {
  align-items: center;
  display: flex;
  gap: 12px;
  margin-bottom: 22px;
}

.brand-mark {
  align-items: center;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  border-radius: 8px;
  color: #fff;
  display: inline-flex;
  font-weight: 800;
  height: 42px;
  justify-content: center;
  width: 42px;
}

.brand strong,
.brand span {
  display: block;
}

.brand strong {
  font-size: 18px;
}

.brand div > span {
  color: var(--muted);
  font-size: 13px;
}

.doc-switch {
  background: #edf2f8;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  display: grid;
  gap: 4px;
  grid-template-columns: 1fr 1fr;
  margin-bottom: 20px;
  padding: 4px;
}

.doc-switch-button {
  background: transparent;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  cursor: pointer;
  min-height: 38px;
}

.doc-switch-button.is-active {
  background: var(--panel);
  box-shadow: 0 2px 8px rgba(23, 32, 51, 0.08);
  color: var(--brand-strong);
  font-weight: 700;
}

.doc-progress {
  background: #f6fbf8;
  border: 1px solid #c9eadb;
  border-radius: 8px;
  color: var(--text);
  margin: -6px 0 16px;
  padding: 10px 12px;
}

.doc-progress strong,
.doc-progress span {
  display: block;
}

.doc-progress strong {
  color: #11734f;
  font-size: 14px;
  line-height: 1.25;
}

.doc-progress span {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
  margin-top: 2px;
}

.nav-search {
  display: block;
  margin-bottom: 14px;
}

.nav-search span {
  color: var(--muted);
  display: block;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  margin-bottom: 6px;
  text-transform: uppercase;
}

.nav-search input {
  appearance: none;
  background: #fff;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  color: var(--text);
  font: inherit;
  min-height: 40px;
  outline: none;
  padding: 9px 11px;
  width: 100%;
}

.nav-search input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(33, 85, 214, 0.12);
}

.nav-list {
  display: grid;
  gap: 6px;
}

.nav-link {
  border-radius: 8px;
  color: var(--text);
  display: block;
  padding: 10px 12px;
  text-decoration: none;
}

.nav-link strong,
.nav-link span {
  display: block;
}

.nav-link strong {
  font-size: 14px;
  font-weight: 650;
}

.nav-link span {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.3;
  margin-top: 2px;
}

.nav-link:hover {
  background: #f0f5fb;
}

.nav-link.is-active {
  background: #e7efff;
  color: var(--brand-strong);
  font-weight: 700;
}

.nav-link.is-active span {
  color: var(--brand-strong);
}

.nav-empty {
  color: var(--muted);
  font-size: 14px;
  margin: 12px 2px 0;
}

.content-shell {
  min-width: 0;
  padding: 34px min(5vw, 72px) 56px;
}

.topbar {
  align-items: center;
  display: flex;
  gap: 16px;
  margin: 0 auto 24px;
  max-width: 1120px;
}

.menu-button {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  cursor: pointer;
  display: none;
  height: 42px;
  padding: 10px;
  width: 42px;
}

.menu-button span {
  background: var(--text);
  display: block;
  height: 2px;
  margin: 4px 0;
}

.eyebrow {
  color: var(--accent);
  display: block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.topbar h1 {
  font-size: 34px;
  line-height: 1.15;
  margin: 2px 0 0;
}

.markdown-body {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  margin: 0 auto;
  max-width: 1120px;
  min-height: 70vh;
  padding: 34px;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  line-height: 1.2;
  margin: 30px 0 12px;
}

.markdown-body h1:first-child,
.markdown-body h2:first-child,
.markdown-body h3:first-child {
  margin-top: 0;
}

.markdown-body h1 {
  font-size: 32px;
}

.markdown-body h2 {
  border-top: 1px solid var(--panel-border);
  font-size: 24px;
  padding-top: 24px;
}

.markdown-body h3 {
  color: var(--brand-strong);
  font-size: 20px;
}

.markdown-body p,
.markdown-body ul,
.markdown-body table {
  margin: 0 0 18px;
}

.markdown-body ul {
  padding-left: 22px;
}

.markdown-body li + li {
  margin-top: 6px;
}

.markdown-body a {
  color: var(--brand);
  font-weight: 650;
}

.markdown-body img {
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  display: block;
  height: auto;
  margin: 12px 0 26px;
  max-width: 100%;
}

.table-wrap {
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  margin: 0 0 24px;
  overflow-x: auto;
}

.markdown-body table {
  border-collapse: collapse;
  margin: 0;
  min-width: 680px;
  width: 100%;
}

.markdown-body th,
.markdown-body td {
  border-bottom: 1px solid var(--panel-border);
  padding: 11px 13px;
  text-align: left;
  vertical-align: top;
}

.markdown-body th {
  background: var(--table-head);
  font-size: 14px;
}

.markdown-body tr:last-child td {
  border-bottom: 0;
}

.markdown-body code {
  background: #eef3f9;
  border-radius: 5px;
  padding: 2px 5px;
}

.markdown-body pre {
  background: #172033;
  border-radius: 8px;
  color: #eef3f9;
  overflow: auto;
  padding: 16px;
}

.markdown-body blockquote {
  border-left: 4px solid var(--accent);
  color: var(--muted);
  margin: 0 0 18px;
  padding: 6px 0 6px 16px;
}

.load-error {
  background: #fff4f0;
  border: 1px solid #f3b8a3;
  border-radius: 8px;
  color: #8a3218;
  padding: 16px;
}

@media (max-width: 900px) {
  .app-shell {
    display: block;
  }

  .sidebar {
    bottom: 0;
    box-shadow: var(--shadow);
    display: none;
    min-height: auto;
    overflow: auto;
    position: fixed;
    top: 0;
    width: min(88vw, 340px);
    z-index: 10;
  }

  .sidebar.is-open {
    display: block;
  }

  .content-shell {
    padding: 18px 14px 32px;
  }

  .menu-button {
    display: inline-block;
    flex: 0 0 auto;
  }

  .topbar,
  .markdown-body {
    max-width: none;
  }

  .topbar h1 {
    font-size: 25px;
  }

  .markdown-body {
    padding: 22px 16px;
  }

  .markdown-body h1 {
    font-size: 25px;
  }

  .markdown-body h2 {
    font-size: 21px;
  }
}