:root {
  color-scheme: light dark;
  --bg: #f8f9fb;
  --fg: #1a1f2c;
  --muted: #5b6577;
  --accent: #1a5fb4;
  --card: #ffffff;
  --border: #e3e6ec;
  --code-bg: #f0f2f5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c1118;
    --fg: #e8f6ff;
    --muted: #8aa0b8;
    --accent: #89ffd8;
    --card: #18283c;
    --border: #29384c;
    --code-bg: #14202e;
  }
}
* {
  box-sizing: border-box;
}
html, body {
  margin: 0;
  padding: 0;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.55;
}
main {
  max-width: 780px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}
h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
}
h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 2rem 0 0.5rem;
}
h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin: 1.25rem 0 0.4rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
p {
  margin: 0 0 1rem;
}
a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
a:hover {
  text-decoration-thickness: 2px;
}
.lede {
  color: var(--muted);
  font-size: 1rem;
  margin-bottom: 1.5rem;
}
code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
code {
  background: var(--code-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.88em;
}
pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.45;
}
pre code {
  background: transparent;
  padding: 0;
}
.examples {
  list-style: none;
  padding: 0;
}
.examples li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
}
.examples li a {
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
}
.examples li a:hover {
  text-decoration: underline;
}
.examples li p {
  color: var(--muted);
  margin: 0.35rem 0 0;
  font-size: 0.9rem;
}
.crumbs {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1rem;
}
.crumbs a {
  color: var(--muted);
}
.demo-area {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  margin: 1rem 0;
  min-height: 80px;
}
.skeleton {
  background: linear-gradient(90deg, var(--code-bg) 0px, var(--border) 40px, var(--code-bg) 80px);
  background-size: 200px 100%;
  animation: shimmer 1.4s infinite linear;
  border-radius: 4px;
  height: 1rem;
  margin: 0.4rem 0;
}
.skeleton.lg {
  height: 1.6rem;
  width: 70%;
}
.skeleton.sm {
  width: 40%;
}
@keyframes shimmer {
  0% {
    background-position: -100px 0;
  }
  100% {
    background-position: 200px 0;
  }
}
button, .btn {
  font: inherit;
  font-size: 0.9rem;
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  cursor: pointer;
  margin: 0.25rem 0.35rem 0.25rem 0;
}
@media (prefers-color-scheme: dark) {
  button, .btn {
    color: #0c1118;
  }
}
button:hover, .btn:hover {
  filter: brightness(0.94);
}
nav.tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}
nav.tabs a {
  text-decoration: none;
  padding: 0.5rem 0.9rem;
  border-radius: 6px 6px 0 0;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--muted);
}
nav.tabs a[aria-current="page"] {
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-bottom: 1px solid var(--card);
  margin-bottom: -1px;
}
.island-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}
.island {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  min-height: 140px;
}
.island h3 {
  margin-top: 0;
}
.source-block {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.source-block h3 {
  color: var(--fg);
  text-transform: none;
  letter-spacing: 0;
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}
.source-block .src-lede {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}
details.src-file {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 0.5rem;
}
details.src-file summary {
  cursor: pointer;
  padding: 0.65rem 0.9rem;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  font-size: 0.9rem;
  user-select: none;
  list-style: none;
}
details.src-file summary::-webkit-details-marker {
  display: none;
}
details.src-file summary::before {
  content: "▸";
  display: inline-block;
  color: var(--muted);
  transition: transform 0.15s ease;
  font-size: 0.75rem;
  width: 1rem;
}
details.src-file[open] summary::before {
  transform: rotate(90deg);
}
details.src-file .src-name {
  font-weight: 600;
  color: var(--fg);
}
details.src-file .src-path {
  color: var(--muted);
  font-size: 0.78rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
details.src-file pre {
  margin: 0;
  border-radius: 0;
  border-top: 1px solid var(--border);
  max-height: 480px;
  overflow: auto;
  font-size: 0.78rem;
}
details.src-file .src-foot {
  margin: 0;
  padding: 0.5rem 0.9rem;
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--card) 90%, var(--bg) 10%);
}
details.src-file .src-foot a {
  color: var(--muted);
}
.refs {
  margin-top: 2.25rem;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--border);
}
.refs h3 {
  color: var(--fg);
  text-transform: none;
  letter-spacing: 0;
  font-size: 1rem;
  margin: 0 0 0.6rem;
}
.refs ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.refs li {
  font-size: 0.88rem;
  margin-bottom: 0.4rem;
  line-height: 1.5;
}
.refs li a {
  font-weight: 500;
}
.refs li .note {
  color: var(--muted);
  font-size: 0.92em;
}
.byline {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}
.byline a {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.byline a:hover {
  color: var(--accent);
}