:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --fg: #1a1d23;
  --muted: #5b6472;
  --card: #ffffff;
  --border: #d8dde6;
  --accent: #2e5e8c;
  --accent-fg: #ffffff;
  --code-bg: #eef1f6;
  --shadow: 0 1px 2px rgba(16,24,40,.06);
  --max: 46rem;
  --rail: 15rem;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1218; --fg: #e8ecf2; --muted: #9aa3b2;
    --card: #171c25; --border: #2a3140; --accent: #7eb0e0;
    --accent-fg: #0e1218; --code-bg: #222836;
    --shadow: 0 1px 2px rgba(0,0,0,.4);
  }
}
:root[data-theme="dark"] {
  --bg: #0e1218; --fg: #e8ecf2; --muted: #9aa3b2;
  --card: #171c25; --border: #2a3140; --accent: #7eb0e0;
  --accent-fg: #0e1218; --code-bg: #222836;
  --shadow: 0 1px 2px rgba(0,0,0,.4);
}
:root[data-theme="light"] {
  --bg: #f6f7f9; --fg: #1a1d23; --muted: #5b6472;
  --card: #ffffff; --border: #d8dde6; --accent: #2e5e8c;
  --accent-fg: #ffffff; --code-bg: #eef1f6;
  --shadow: 0 1px 2px rgba(16,24,40,.06);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; font: 17px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg); color: var(--fg);
}
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
header.site {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  border-bottom: 1px solid var(--border);
}
.bar {
  max-width: calc(var(--max) + var(--rail) + 4rem);
  margin: 0 auto; padding: .7rem 1.1rem;
  display: flex; gap: .75rem; align-items: center; flex-wrap: wrap;
}
.brand { font-weight: 700; color: var(--fg); text-decoration: none; letter-spacing: -.01em; }
.brand span { color: var(--muted); font-weight: 500; margin-left: .35rem; }
nav.primary { display: flex; gap: .35rem; flex-wrap: wrap; margin-left: auto; }
nav.primary a {
  text-decoration: none; color: var(--muted); padding: .35rem .7rem; border-radius: 999px;
}
nav.primary a[aria-current="page"], nav.primary a:hover {
  background: var(--card); color: var(--fg); box-shadow: var(--shadow);
}
button.theme {
  border: 1px solid var(--border); background: var(--card); color: var(--fg);
  border-radius: 999px; padding: .35rem .75rem; cursor: pointer; font: inherit;
}
main.wrap {
  max-width: calc(var(--max) + var(--rail) + 4rem);
  margin: 0 auto; padding: 1.25rem 1.1rem 4rem;
  display: grid; grid-template-columns: var(--rail) minmax(0, var(--max)); gap: 2rem;
}
aside.toc {
  position: sticky; top: 4.2rem; align-self: start;
  font-size: .9rem; color: var(--muted); max-height: calc(100vh - 5rem); overflow: auto;
}
aside.toc strong { display: block; color: var(--fg); margin-bottom: .5rem; }
aside.toc ul { list-style: none; padding: 0; margin: 0; }
aside.toc li { margin: .25rem 0; }
aside.toc a { color: var(--muted); text-decoration: none; }
aside.toc a:hover { color: var(--accent); }
article.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  padding: 1.4rem 1.5rem 2rem; box-shadow: var(--shadow);
}
article h1 { font-size: 1.85rem; line-height: 1.2; margin: 0 0 .6rem; letter-spacing: -.02em; }
article h2 { font-size: 1.35rem; margin: 2rem 0 .6rem; padding-top: .4rem; border-top: 1px solid var(--border); }
article h2:first-of-type { border-top: 0; padding-top: 0; }
article h3 { font-size: 1.1rem; margin: 1.4rem 0 .4rem; }
article p, article li { color: var(--fg); }
article blockquote {
  margin: 1rem 0; padding: .75rem 1rem; border-left: 4px solid var(--accent);
  background: var(--code-bg); border-radius: 0 10px 10px 0; color: var(--fg);
}
article code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .92em; background: var(--code-bg); padding: .1em .35em; border-radius: 4px;
}
article pre {
  background: var(--code-bg); padding: .9rem 1rem; border-radius: 10px; overflow: auto;
}
article img {
  max-width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--border);
  display: block; margin: .75rem auto;
}
article figure { margin: 1.1rem 0; }
article figure.wide img { max-width: min(100%, 36rem); }
article figcaption { text-align: center; color: var(--muted); font-size: .88rem; margin-top: .4rem; }
article table { width: 100%; border-collapse: collapse; font-size: .95rem; }
article th, article td { border: 1px solid var(--border); padding: .45rem .6rem; text-align: left; }
article th { background: var(--code-bg); }
footer.site {
  max-width: calc(var(--max) + var(--rail) + 4rem);
  margin: 0 auto; padding: 0 1.1rem 2.5rem; color: var(--muted); font-size: .9rem;
}
/* Home: no TOC rail (CSP blocks inline styles, so class not style=). */
main.wrap.home {
  grid-template-columns: 1fr;
  max-width: min(44rem, calc(100% - 0.5rem));
  justify-items: stretch;
}
main.wrap.home .intro {
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  padding: 1.4rem 1.5rem 1.2rem; box-shadow: var(--shadow); margin-bottom: 1rem;
}
main.wrap.home .intro h1 { font-size: 1.85rem; line-height: 1.2; margin: 0 0 .6rem; letter-spacing: -.02em; }
main.wrap.home .intro p { margin: 0; }
.home-grid {
  display: grid; gap: 1rem;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .home-grid { grid-template-columns: 1fr 1fr; }
  .home-grid a.cardlink.android { grid-column: 1 / -1; }
}
.home-grid a.cardlink {
  display: block; text-decoration: none; color: inherit;
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  padding: 1.2rem 1.3rem; box-shadow: var(--shadow);
}
.home-grid a.cardlink:hover { border-color: var(--accent); }
.home-grid h2 { margin: 0 0 .35rem; font-size: 1.2rem; color: var(--fg); }
.home-grid p { margin: 0; color: var(--muted); }
.home-grid .tag {
  display: inline-block; margin-top: .65rem; font-size: .8rem; font-weight: 600;
  color: var(--accent-fg); background: var(--accent); padding: .2rem .55rem; border-radius: 999px;
}
@media (max-width: 860px) {
  main.wrap { grid-template-columns: 1fr; }
  aside.toc { position: static; max-height: none; order: 2; }
  article.card { order: 1; }
  nav.primary { margin-left: 0; width: 100%; }
}