:root {
  --bg: #f5f2ea;
  --panel: rgba(255, 255, 255, 0.88);
  --panel-strong: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: rgba(15, 23, 42, 0.12);
  --accent: #0f766e;
  --accent-soft: rgba(15, 118, 110, 0.12);
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  background: radial-gradient(circle at top left, #fffaf0 0%, #f5f2ea 42%, #ecf2f1 100%);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Source Serif 4", "Georgia", "Times New Roman", serif;
  line-height: 1.65;
}

a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration: none;
}

.page-shell {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  padding: 28px 22px 30px;
  border-right: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(247, 245, 240, 0.84));
  backdrop-filter: blur(14px);
}

.brand {
  margin-bottom: 18px;
}

.brand-title {
  display: block;
  font-size: 1.15rem;
  line-height: 1.25;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.brand p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.lang-switch {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 18px 0 26px;
}

.lang-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel-strong);
  color: var(--text);
  font-size: 0.92rem;
  text-decoration: none;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

.lang-button.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.nav-section + .nav-section {
  margin-top: 22px;
}

.nav-section h2 {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.nav-list {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a {
  display: block;
  padding: 9px 12px;
  border-radius: 12px;
  color: var(--text);
  text-decoration: none;
}

.nav-list a:hover,
.nav-list a.is-active {
  background: var(--accent-soft);
  color: #0f172a;
}

.content {
  width: min(920px, 100%);
  padding: 42px 48px 56px;
}

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

.content h1 {
  margin-bottom: 0.45em;
  font-size: clamp(2rem, 3.4vw, 3.15rem);
  line-height: 1.1;
}

.content h2 {
  margin-top: 1.9em;
}

.content hr {
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 2.2em 0;
}

.content ul li {
  margin-bottom: 0.35em;
}

.content a {
  font-weight: 500;
}

.content img {
  max-width: 100%;
}

.content table {
  display: block;
  overflow-x: auto;
  border-collapse: collapse;
}

.content th,
.content td {
  border: 1px solid var(--border);
  padding: 0.6em 0.9em;
}

.content th {
  background: var(--accent-soft);
  font-weight: 600;
  text-align: left;
}

.content tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.5);
}

.content tr:hover {
  background: rgba(15, 118, 110, 0.06);
}

.content blockquote {
  margin-left: 0;
  padding: 0.5rem 0 0.5rem 1.1rem;
  border-left: 3px solid var(--accent);
  color: #374151;
  background: rgba(15, 118, 110, 0.04);
  border-radius: 0 8px 8px 0;
}

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

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

.sidebar-footer {
  margin-top: auto;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
}

.sidebar-footer .repo-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 8px;
  background: var(--panel-strong);
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  transition: background 0.15s ease;
}

.sidebar-footer .repo-link:hover {
  background: var(--accent-soft);
}

.sidebar-footer .license {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

@media (max-width: 920px) {
  .page-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .sidebar-footer {
    margin-top: 18px;
  }

  .content {
    width: 100%;
    padding: 28px 20px 42px;
  }
}