:root {
  color-scheme: light dark;
  --primary: #00695C; --on-primary: #FFFFFF; --container: #A7F2E4; --on-container: #00201B;
  --surface: #F8FAF9; --on-surface: #191C1B; --surface-2: #ECEFED; --muted: #3F4946; --outline: #6F7976;
}
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #80CBC4; --on-primary: #00382F; --container: #00504A; --on-container: #A7F2E4;
    --surface: #101413; --on-surface: #E0E3E1; --surface-2: #1C201F; --muted: #BEC9C5; --outline: #89938F;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--surface); color: var(--on-surface);
       font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
       display: flex; min-height: 100vh; flex-direction: column; overflow-wrap: break-word; }
a { color: var(--primary); }
a:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; }
.wrap { width: 100%; max-width: 46rem; margin: 0 auto; padding: 0 1.25rem; }
header.top { border-bottom: 1px solid var(--surface-2); }
header.top .wrap { display: flex; align-items: center; gap: .6rem; min-height: 3.5rem; }
header.top a { display: flex; align-items: center; gap: .6rem; color: inherit; text-decoration: none; font-weight: 600; }
header.top img { width: 32px; height: 32px; border-radius: 8px; }
main { flex: 1; padding: 2rem 0 3rem; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 1rem; }
h2 { font-size: 1.25rem; line-height: 1.3; margin: 2rem 0 .5rem; }
h3 { font-size: 1.05rem; margin: 0 0 .3rem; }
ul { padding-left: 1.3rem; }
.hero { text-align: center; padding: 1.5rem 0 1rem; }
.hero img { width: 96px; height: 96px; border-radius: 22px; }
.hero h1 { font-size: 2.1rem; margin: 1rem 0 .75rem; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 36rem; margin: 0 auto; }
.badge { display: inline-block; margin-top: 1.5rem; padding: .75rem 1.4rem; border-radius: 999px;
         background: var(--primary); color: var(--on-primary); font-weight: 600; }
.features { list-style: none; padding: 0; display: grid; gap: 1rem; margin: 2.5rem 0; }
@media (min-width: 40rem) { .features { grid-template-columns: 1fr 1fr; } }
.features li { background: var(--surface-2); border-radius: 16px; padding: 1.1rem 1.2rem; }
.features p { margin: 0; color: var(--muted); }
.pro { background: var(--container); color: var(--on-container); border-radius: 16px; padding: 1.3rem 1.4rem; }
.pro h2 { margin-top: 0; }
.note { font-size: .9rem; color: var(--muted); }
.toc { padding-left: 1.3rem; }
footer { border-top: 1px solid var(--surface-2); font-size: .9rem; color: var(--muted); padding: 1.25rem 0 2rem; }
footer nav { display: flex; flex-wrap: wrap; gap: .4rem 1.2rem; margin-bottom: .5rem; }
footer p { margin: .3rem 0; }