:root {
  --bg: #f7fafa;
  --surface: #ffffff;
  --ink: #16302c;
  --muted: #5c7370;
  --accent: #2e8a80;
  --accent-soft: #e6f4f1;
  --rule: #dceae7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1917;
    --surface: #16231f;
    --ink: #e8f2ef;
    --muted: #9db3ae;
    --accent: #63c4b2;
    --accent-soft: #1c2f2a;
    --rule: #24382f;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
.wrap { max-width: 46rem; margin: 0 auto; padding: 2.5rem 1.25rem 5rem; }

header { display: flex; align-items: center; gap: .9rem; margin-bottom: 1.6rem; }
.mark {
  width: 46px; height: 46px; border-radius: 12px; flex: none;
  background: linear-gradient(135deg, #63c4b2, #2e8a80);
  display: grid; place-items: center; color: #fff; font-weight: 700; font-size: 20px;
  text-decoration: none;
}
header h1 { font-size: 1.35rem; margin: 0; letter-spacing: -.01em; }
header p { margin: .15rem 0 0; color: var(--muted); font-size: .92rem; }

nav { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 2.25rem; }
nav a {
  font-size: .85rem; text-decoration: none; padding: .35rem .8rem;
  border: 1px solid var(--rule); border-radius: 999px; color: var(--muted);
}
nav a:hover { border-color: var(--accent); color: var(--accent); }
nav a[aria-current="page"] { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

.lede {
  background: var(--accent-soft); border-left: 3px solid var(--accent);
  padding: 1rem 1.15rem; border-radius: 0 8px 8px 0; margin: 0 0 2rem;
}
.lede strong { color: var(--accent); }

h2 {
  font-size: 1.08rem; margin: 2.4rem 0 .7rem; padding-top: 1.4rem;
  border-top: 1px solid var(--rule); letter-spacing: -.01em;
}
h2.first { border-top: 0; padding-top: 0; margin-top: 1.6rem; }
ul { padding-left: 1.2rem; }
li { margin: .35rem 0; }
a { color: var(--accent); }
.meta { color: var(--muted); font-size: .88rem; }

.cards { display: grid; gap: .9rem; margin: 1.5rem 0 0; }
@media (min-width: 34rem) { .cards { grid-template-columns: 1fr 1fr; } }
.card {
  display: block; text-decoration: none; color: inherit;
  background: var(--surface); border: 1px solid var(--rule);
  border-radius: 10px; padding: 1.1rem 1.15rem;
}
.card:hover { border-color: var(--accent); }
.card h3 { margin: 0 0 .3rem; font-size: 1rem; color: var(--accent); }
.card p { margin: 0; font-size: .9rem; color: var(--muted); }

.notice {
  margin-top: 2.5rem; padding: 1rem 1.15rem; border: 1px solid var(--rule);
  border-radius: 8px; background: var(--surface); font-size: .95rem;
}
footer {
  margin-top: 3rem; padding-top: 1.4rem; border-top: 1px solid var(--rule);
  color: var(--muted); font-size: .88rem;
}