:root {
  --bg: #f6f3ec;
  --surface: #ffffff;
  --text: #1d2a2e;
  --muted: #4a5a5e;
  --accent: #0d5c63;
  --accent-text: #ffffff;
  --line: #d9d3c5;
  --focus: #b4560a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1a1d;
    --surface: #16262a;
    --text: #e9efef;
    --muted: #a9bcbf;
    --accent: #6fc5c9;
    --accent-text: #0b1517;
    --line: #2a3f44;
    --focus: #f0a45a;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 1.0625rem/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--accent);
  color: var(--accent-text);
  padding: 0.6rem 1rem;
  border-radius: 0.4rem;
  z-index: 10;
}
.skip:focus { top: 1rem; }

a { color: var(--accent); text-underline-offset: 0.15em; }
a:focus-visible, .skip:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

header, main, footer {
  width: 100%;
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1rem;
}

header { padding-top: 1.5rem; padding-bottom: 1rem; }

.brand {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
}

nav { margin-top: 0.4rem; }
nav a { margin-right: 1.1rem; }

main { padding-top: 1.5rem; padding-bottom: 3rem; }

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 0.75rem; }
h2 { font-size: 1.3rem; line-height: 1.3; margin: 2rem 0 0.5rem; }
p, li { max-width: 40rem; }
ul { padding-left: 1.25rem; }

.lead { font-size: 1.2rem; color: var(--muted); }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}

.summary {
  border-left: 4px solid var(--accent);
  background: var(--surface);
  padding: 0.75rem 1rem;
  border-radius: 0 0.5rem 0.5rem 0;
}

footer {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  padding-bottom: 2rem;
  color: var(--muted);
  font-size: 0.95rem;
}