:root {
  color-scheme: light;
  --background: #f3f0e8;
  --surface: #fbfaf5;
  --surface-strong: #ffffff;
  --ink: #242722;
  --muted: #6c7068;
  --line: #d8d3c6;
  --accent: #37675a;
  --accent-soft: #dce9e3;
  --warm: #9a6538;
  --shadow: 0 14px 38px rgb(44 45 38 / 10%);
  --sidebar-width: 18.5rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 20rem;
  background:
    radial-gradient(circle at 90% 0%, rgb(154 101 56 / 9%), transparent 28rem),
    var(--background);
  color: var(--ink);
  font-family: Inter, "Segoe UI", system-ui, -apple-system, sans-serif;
  line-height: 1.65;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible,
article:focus-visible {
  outline: 3px solid rgb(55 103 90 / 35%);
  outline-offset: 3px;
}

.app-shell {
  display: grid;
  grid-template:
    "topbar topbar" auto
    "sidebar content" 1fr / var(--sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
}

.topbar {
  position: sticky;
  z-index: 20;
  top: 0;
  grid-area: topbar;
  display: flex;
  align-items: center;
  min-height: 4.5rem;
  padding: 0.65rem clamp(1rem, 3vw, 2rem);
  border-bottom: 1px solid var(--line);
  background: rgb(251 250 245 / 92%);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2.35rem;
  height: 2.35rem;
  place-items: center;
  border: 1px solid var(--accent);
  border-radius: 0.65rem;
  background: var(--accent);
  color: white;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.25rem;
}

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

.brand strong {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.brand small {
  color: var(--muted);
  font-size: 0.75rem;
}

.language-switch {
  display: flex;
  gap: 0.2rem;
  margin-left: auto;
  padding: 0.2rem;
  border: 1px solid var(--line);
  border-radius: 0.7rem;
  background: var(--background);
}

.language-switch button,
.nav-button {
  border: 0;
  color: var(--muted);
  font: inherit;
  cursor: pointer;
}

.language-switch button {
  padding: 0.45rem 0.7rem;
  border-radius: 0.5rem;
  background: transparent;
  font-size: 0.82rem;
}

.language-switch button:hover {
  color: var(--ink);
}

.language-switch button[aria-pressed="true"] {
  background: var(--surface-strong);
  color: var(--accent);
  box-shadow: 0 1px 5px rgb(44 45 38 / 10%);
  font-weight: 650;
}

.nav-button {
  display: none;
  align-items: center;
  gap: 0.45rem;
  margin-right: 0.75rem;
  padding: 0.45rem 0.6rem;
  border-radius: 0.55rem;
  background: transparent;
}

.nav-button:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.sidebar {
  position: sticky;
  top: 4.5rem;
  grid-area: sidebar;
  height: calc(100vh - 4.5rem);
  overflow-y: auto;
  padding: 1.5rem 1rem 2rem;
  border-right: 1px solid var(--line);
  background: rgb(251 250 245 / 70%);
}

.sidebar-heading {
  padding: 0 0.65rem 0.85rem;
}

.sidebar-heading span,
.sidebar-heading small {
  display: block;
}

.sidebar-heading span {
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sidebar-heading small {
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.72rem;
}

#page-navigation {
  display: block;
}

.navigation-list,
.navigation-children {
  display: grid;
  gap: 0.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.navigation-children {
  margin: 0.18rem 0 0.45rem 0.8rem;
  padding-left: 0.65rem;
  border-left: 1px solid var(--line);
}

.navigation-children[hidden] {
  display: none;
}

.navigation-toggle {
  display: flex;
  width: 100%;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.55rem;
  padding: 0.58rem 0.7rem;
  border: 0;
  border-radius: 0.55rem;
  background: transparent;
  color: #51564f;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.35;
  text-align: left;
  cursor: pointer;
}

.navigation-toggle:hover,
.navigation-item.nav-branch-active > .navigation-toggle {
  background: var(--accent-soft);
  color: var(--accent);
}

.navigation-toggle-label {
  min-width: 0;
}

.navigation-chevron {
  flex: 0 0 auto;
  font-size: 1.2em;
  line-height: 1.125;
  transform: rotate(0);
  transition: transform 150ms ease;
}

.navigation-toggle[aria-expanded="true"] .navigation-chevron {
  transform: rotate(90deg);
}

#page-navigation a {
  display: block;
  padding: 0.58rem 0.7rem;
  border-radius: 0.55rem;
  color: #51564f;
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.35;
  text-decoration: none;
}

.navigation-children a {
  padding: 0.48rem 0.6rem;
  color: var(--muted);
  font-size: 0.84rem;
}

#page-navigation a:hover,
#page-navigation a[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--accent);
}

#page-navigation a[aria-current="page"] {
  box-shadow: inset 3px 0 0 var(--accent);
}

.sidebar-scrim {
  display: none;
}

.content-area {
  grid-area: content;
  width: min(100%, 64rem);
  padding: clamp(2rem, 5vw, 4.5rem) clamp(1.25rem, 6vw, 5.5rem) 2rem;
}

.markdown {
  min-height: 60vh;
  border: 1px solid rgb(216 211 198 / 75%);
  border-radius: 1rem;
  background: var(--surface);
  padding: clamp(1.35rem, 5vw, 4rem);
  box-shadow: var(--shadow);
}

.markdown > :first-child {
  margin-top: 0;
}

.markdown > :last-child {
  margin-bottom: 0;
}

.markdown h1,
.markdown h2,
.markdown h3 {
  color: #202820;
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.2;
  scroll-margin-top: 6rem;
}

.markdown h1 {
  margin: 0 0 1.6rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 550;
  letter-spacing: -0.02em;
}

.markdown h2 {
  margin: 2.6rem 0 0.85rem;
  font-size: clamp(1.35rem, 3vw, 1.7rem);
  font-weight: 600;
}

.markdown h3 {
  margin: 2rem 0 0.7rem;
}

.markdown p {
  margin: 0.85rem 0;
}

.markdown a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

.markdown a:hover {
  color: #234d42;
}

.markdown strong {
  color: #263f37;
}

.markdown ul,
.markdown ol {
  margin: 0.8rem 0 1.2rem;
  padding-left: 1.45rem;
}

.markdown li {
  margin: 0.4rem 0;
  padding-left: 0.18rem;
}

.markdown blockquote {
  margin: 1.35rem 0;
  padding: 0.8rem 1.1rem;
  border-left: 0.28rem solid var(--warm);
  border-radius: 0 0.55rem 0.55rem 0;
  background: #f2e9dd;
  color: #4f443a;
}

.markdown blockquote p {
  margin: 0.35rem 0;
}

.table-wrap {
  overflow-x: auto;
  margin: 1.2rem 0;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
}

.markdown table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface-strong);
  font-size: 0.88rem;
  line-height: 1.45;
}

.markdown th,
.markdown td {
  min-width: 8.5rem;
  padding: 0.7rem 0.8rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.markdown th {
  background: var(--accent-soft);
  color: #263f37;
  font-weight: 700;
}

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

.error-panel {
  padding: 1rem;
  border: 1px solid #bd7669;
  border-radius: 0.65rem;
  background: #f8e8e4;
}

footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding: 1.25rem 0 0;
  color: var(--muted);
  font-size: 0.75rem;
}

.noscript {
  margin: 2rem;
  padding: 1rem;
  border: 1px solid var(--line);
  background: var(--surface);
}

@media (max-width: 760px) {
  .app-shell {
    display: block;
  }

  .topbar {
    min-height: 4rem;
    padding: 0.55rem 0.8rem;
  }

  .nav-button {
    display: inline-flex;
  }

  .nav-button-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }

  .brand small {
    display: none;
  }

  .brand-mark {
    width: 2rem;
    height: 2rem;
  }

  .language-switch button {
    padding: 0.4rem 0.52rem;
  }

  .sidebar {
    position: fixed;
    z-index: 30;
    top: 0;
    left: 0;
    width: min(85vw, 20rem);
    height: 100vh;
    transform: translateX(-105%);
    border-right: 1px solid var(--line);
    background: var(--surface);
    box-shadow: var(--shadow);
    transition: transform 180ms ease;
  }

  body.sidebar-open {
    overflow: hidden;
  }

  body.sidebar-open .sidebar {
    transform: translateX(0);
  }

  .sidebar-scrim {
    position: fixed;
    z-index: 25;
    inset: 0;
    border: 0;
    background: rgb(20 24 21 / 45%);
  }

  body.sidebar-open .sidebar-scrim {
    display: block;
  }

  .content-area {
    width: 100%;
    padding: 1rem 0.75rem 1.5rem;
  }

  .markdown {
    padding: 1.35rem 1rem 1.8rem;
    border-radius: 0.75rem;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --background: #171b19;
    --surface: #202522;
    --surface-strong: #272d29;
    --ink: #e7e9e3;
    --muted: #aeb4ac;
    --line: #3a423d;
    --accent: #8ac2ae;
    --accent-soft: #2a4038;
    --warm: #d29a65;
    --shadow: 0 18px 45px rgb(0 0 0 / 24%);
  }

  body {
    background:
      radial-gradient(circle at 90% 0%, rgb(210 154 101 / 8%), transparent 28rem),
      var(--background);
  }

  .topbar,
  .sidebar {
    background: rgb(32 37 34 / 92%);
  }

  .markdown h1,
  .markdown h2,
  .markdown h3 {
    color: #f0f2ed;
  }

  .markdown strong {
    color: #b9decf;
  }

  .markdown a:hover {
    color: #b9decf;
  }

  .markdown blockquote {
    background: #352c24;
    color: #e2d4c6;
  }

  .markdown th {
    color: #d1e8df;
  }

  .error-panel {
    background: #432b28;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .sidebar {
    transition: none;
  }

  .navigation-chevron {
    transition: none;
  }
}