:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --text: #1d1d1f;
  --dim: #6e6e73;
  --rule: #d2d2d7;
  --accent: #0071e3;
  --code-bg: #f5f5f7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-alt: #1c1c1e;
    --text: #f5f5f7;
    --dim: #98989d;
    --rule: #38383a;
    --accent: #2997ff;
    --code-bg: #1c1c1e;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue",
        Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* Sticky translucent bar, the way an Apple product page does it. */
nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--rule);
}
nav .inner {
  max-width: 43rem;
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 48px;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: .85rem;
}
nav .brand {
  display: flex; align-items: center; gap: .5rem;
  font-weight: 600; color: var(--text); text-decoration: none;
}
nav .brand img { width: 22px; height: 22px; border-radius: 5px; display: block; }
nav .spacer { flex: 1 1 auto; }
nav a { color: var(--dim); text-decoration: none; }
nav a:hover { color: var(--text); }
nav a[aria-current="page"] { color: var(--text); font-weight: 500; }

main { max-width: 43rem; margin: 0 auto; padding: 3rem 1.25rem 4rem; }

/* Centred app hero */
.hero { text-align: center; padding: 1rem 0 2.5rem; }
.hero img {
  width: 110px; height: 110px; border-radius: 24px; display: block;
  margin: 0 auto 1.25rem;
  box-shadow: 0 8px 24px rgba(0,0,0,.14);
}
.hero h1 { font-size: 2.6rem; line-height: 1.1; margin: 0 0 .5rem; letter-spacing: -.022em; }
.hero p { margin: 0; color: var(--dim); font-size: 1.2rem; line-height: 1.4; }

h1 { font-size: 2rem; letter-spacing: -.02em; margin: 0 0 .4rem; }
h2 {
  font-size: 1.4rem; letter-spacing: -.01em;
  margin: 2.75rem 0 .75rem; padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}
h3 { font-size: 1.05rem; margin: 1.75rem 0 .5rem; }

.date { color: var(--dim); font-size: .95rem; margin: 0 0 2rem; }

.lead {
  background: var(--bg-alt);
  border-radius: 14px;
  padding: 1.15rem 1.35rem;
  margin: 1.75rem 0;
  font-size: 1.05rem;
}

table { border-collapse: collapse; width: 100%; margin: 1.25rem 0; font-size: .95rem; }
th, td { text-align: left; padding: .75rem .5rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; color: var(--dim); font-weight: 600; }

code, pre {
  background: var(--code-bg);
  border-radius: 8px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: .85rem;
}
code { padding: .12rem .35rem; }
pre { padding: 1rem 1.15rem; overflow-x: auto; line-height: 1.55; }
pre code { background: none; padding: 0; }

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

ul { padding-left: 1.3rem; }
li { margin: .4rem 0; }

.note {
  background: var(--bg-alt);
  border-radius: 12px;
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
  font-size: .95rem;
  color: var(--dim);
}
.note strong { color: var(--text); }

footer {
  border-top: 1px solid var(--rule);
  background: var(--bg-alt);
  color: var(--dim);
  font-size: .85rem;
}
footer .inner { max-width: 43rem; margin: 0 auto; padding: 2rem 1.25rem; }
footer a { color: var(--dim); }
footer .links { margin-top: .75rem; display: flex; gap: 1.25rem; flex-wrap: wrap; }

@media (max-width: 34rem) {
  body { font-size: 16px; }
  .hero img { width: 88px; height: 88px; border-radius: 19px; }
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1.05rem; }
  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.2rem; }
}