:root {
  color-scheme: light dark;
  --bg: #0b0b0f;
  --panel: #10101a;
  --text: #f3f4f6;
  --muted: #a1a1aa;
  --border: rgba(255, 255, 255, 0.08);
  --link: #93c5fd;
  --codebg: rgba(255, 255, 255, 0.06);
  --shadow: rgba(0, 0, 0, 0.35);
  --max: 900px;
  --radius: 12px;
  --gutter: 16px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica,
    Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fafafa;
    --panel: #ffffff;
    --text: #0b0b0f;
    --muted: #52525b;
    --border: rgba(0, 0, 0, 0.08);
    --link: #2563eb;
    --codebg: rgba(0, 0, 0, 0.04);
    --shadow: rgba(0, 0, 0, 0.08);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
}

a {
  color: var(--link);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* App shell */
.app {
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px var(--gutter);
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  backdrop-filter: blur(10px);
}

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  flex-shrink: 0;
}
.menu-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  position: relative;
}
.menu-toggle span::before,
.menu-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.2s;
}
.menu-toggle span::before {
  top: -5px;
}
.menu-toggle span::after {
  top: 5px;
}
.menu-toggle[aria-expanded="true"] span {
  background: transparent;
}
.menu-toggle[aria-expanded="true"] span::before {
  transform: translateY(5px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] span::after {
  transform: translateY(-5px) rotate(-45deg);
}

.brand {
  font-weight: 700;
  font-size: 15px;
  color: var(--text);
  padding: 6px 0;
}
.brand:hover {
  text-decoration: none;
  opacity: 0.8;
}

.header-links {
  display: flex;
  gap: 8px;
  margin-left: auto;
}

.header-link {
  padding: 6px 12px;
  font-size: 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text);
}
.header-link:hover {
  background: var(--codebg);
  text-decoration: none;
}

/* Overlay */
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 15;
  background: rgba(0, 0, 0, 0.5);
}
.overlay.open {
  display: block;
}

/* Layout */
.layout {
  display: flex;
  gap: var(--gutter);
  padding: var(--gutter);
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* Sidebar */
.sidebar {
  width: 240px;
  flex-shrink: 0;
  position: sticky;
  top: 72px;
  align-self: flex-start;
  max-height: calc(100vh - 88px);
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
}

.nav {
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav a {
  display: block;
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
}
.nav a:hover {
  background: var(--codebg);
  text-decoration: none;
}
.nav a[aria-current="page"] {
  background: color-mix(in srgb, var(--link) 15%, transparent);
}

/* Main content */
.main {
  flex: 1;
  min-width: 0;
}

.content {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 24px;
}

/* Footer */
.site-footer {
  padding: 16px var(--gutter);
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer-link {
  font-size: 13px;
  color: var(--muted);
}
.footer-link:hover {
  color: var(--text);
  text-decoration: none;
}

/* Content typography */
.content h1,
.content h2,
.content h3 {
  scroll-margin-top: 80px;
}

.content h1 {
  margin-top: 0;
  font-size: 28px;
}

.content h2 {
  font-size: 20px;
  margin-top: 32px;
}

.content h3 {
  font-size: 16px;
  margin-top: 24px;
}

.content p,
.content li {
  line-height: 1.65;
}

.content code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--codebg);
  padding: 2px 6px;
  border-radius: 6px;
}

.content pre {
  overflow-x: auto;
  padding: 16px;
  border-radius: 10px;
  background: var(--codebg);
  border: 1px solid var(--border);
  font-size: 14px;
  line-height: 1.5;
}

.content pre code {
  background: transparent;
  padding: 0;
}

.content details {
  margin: 16px 0;
}

.content details summary {
  cursor: pointer;
  padding: 8px 0;
}

.empty {
  color: var(--muted);
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --gutter: 16px;
  }

  .menu-toggle {
    display: flex;
  }

  .layout {
    flex-direction: column;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    max-width: 80vw;
    z-index: 16;
    border: none;
    border-radius: 0;
    border-right: 1px solid var(--border);
    max-height: none;
    padding-top: 60px;
    transform: translateX(-100%);
    transition: transform 0.2s ease-out;
  }

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

  .nav {
    padding: 12px;
  }

  .nav a {
    padding: 12px 14px;
    font-size: 15px;
  }

  .content {
    padding: 20px;
    border-radius: 10px;
  }

  .content h1 {
    font-size: 24px;
  }

  .content h2 {
    font-size: 18px;
  }

  .content pre {
    font-size: 13px;
    padding: 14px;
  }
}