:root {
  --bg: #ffffff;
  --surface: #f6f8fa;
  --text: #14171a;
  --muted: #4d545c;
  --accent: #0a58ca;
  --border: #d8dee4;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --surface: #161b22;
    --text: #e6edf3;
    --muted: #9aa7b4;
    --accent: #79c0ff;
    --border: #30363d;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 1.25rem 4rem;
  background: var(--bg);
  color: var(--text);
  font: 1rem/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.wrap { max-width: 56rem; margin: 0 auto; }

.skip {
  position: absolute;
  left: -9999px;
  background: var(--accent);
  color: var(--bg);
  padding: 0.75rem 1rem;
  border-radius: 0 0 6px 0;
}
.skip:focus { left: 0; top: 0; z-index: 10; }

a { color: var(--accent); }
a:focus-visible,
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.hero { padding: 3rem 0 2rem; border-bottom: 1px solid var(--border); }
.avatar { border-radius: 50%; display: block; }
h1 { font-size: clamp(1.75rem, 5vw, 2.5rem); margin: 1rem 0 0.25rem; }
.bio { color: var(--muted); margin: 0 0 1.25rem; max-width: 42rem; }

.links { list-style: none; display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; padding: 0; margin: 0; }
/* 44px minimum tap target, exceeding the 24px WCAG 2.2 AA floor */
.links a { display: inline-flex; align-items: center; min-height: 44px; }

main h2 { font-size: 1.25rem; margin: 2.5rem 0 1rem; }

.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 20rem), 1fr)); }
.card { background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 1.25rem; }
.card h3 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.card h3 a { display: inline-flex; align-items: center; min-height: 44px; text-decoration-thickness: 2px; }
.card p { margin: 0 0 0.75rem; color: var(--muted); }

.topics { list-style: none; display: flex; flex-wrap: wrap; gap: 0.375rem;
  padding: 0; margin: 0 0 0.75rem; }
.topics li { background: var(--bg); border: 1px solid var(--border); border-radius: 999px;
  padding: 0.125rem 0.625rem; font-size: 0.75rem; color: var(--muted); }

.meta { list-style: none; display: flex; flex-wrap: wrap; gap: 0.25rem 1rem;
  padding: 0; margin: 0 0 0.75rem; color: var(--muted); font-size: 0.875rem; }
.also { font-size: 0.875rem; }
.also a { min-height: 44px; display: inline-flex; align-items: center; }

footer { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 0.9375rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}