:root {
  --bg: #FBFAF8; --panel: #FFFFFF; --ink: #16302F; --body: #374443; --muted: #6a7776;
  --line: #e9e5df; --teal: #20808D; --teal-ink: #1a6b76; --teal-soft: #e6f0ed;
  --serif: Georgia, 'Times New Roman', serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg:#131716; --panel:#1a1f1e; --ink:#eaf1ef; --body:#c3cdcb; --muted:#8a9694; --line:#282f2e; --teal:#3fb6b0; --teal-ink:#4cc3bd; --teal-soft:#182827; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { background: var(--bg); color: var(--body); font-family: var(--sans); margin: 0; line-height: 1.65; font-size: 17px; }
.wrap { max-width: 720px; margin: 0 auto; padding: 26px 22px 72px; }

.topbar { display: flex; align-items: center; justify-content: space-between; padding: 8px 0 22px; border-bottom: 1px solid var(--line); margin-bottom: 34px; flex-wrap: wrap; gap: 12px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.brand .mark { width: 30px; height: 30px; display: block; }
.brand .name { font-family: var(--sans); font-weight: 700; font-size: 20px; color: var(--ink); letter-spacing: -0.01em; }
.nav a { font-size: 14.5px; color: var(--muted); text-decoration: none; margin-left: 18px; font-weight: 500; }
.nav a:hover, .nav a.active { color: var(--teal-ink); }

h1 { font-family: var(--sans); font-size: 30px; line-height: 1.15; color: var(--ink); margin: 8px 0 4px; letter-spacing: -0.015em; }
.updated { color: var(--muted); font-size: 14px; font-style: italic; margin: 0 0 30px; }
h2 { font-family: var(--sans); font-size: 18px; color: var(--ink); margin: 34px 0 8px; letter-spacing: -0.005em; }
h2:first-of-type { margin-top: 10px; }
p { font-family: var(--serif); font-size: 17.5px; line-height: 1.7; color: var(--body); margin: 0 0 14px; }
.lead { font-size: 18px; color: var(--ink); }
a { color: var(--teal-ink); }

.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 30px 0; }
@media (max-width: 560px) { .cards { grid-template-columns: 1fr; } }
.card { display: block; text-decoration: none; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 22px; transition: border-color .15s; }
.card:hover { border-color: var(--teal); }
.card .ct { font-family: var(--sans); font-weight: 700; font-size: 17px; color: var(--ink); margin-bottom: 4px; }
.card .cd { font-family: var(--sans); font-size: 14px; color: var(--muted); line-height: 1.5; }

footer { margin-top: 46px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; font-family: var(--sans); line-height: 1.7; }
footer a { color: var(--muted); }
:focus-visible { outline: 2px solid var(--teal); outline-offset: 3px; border-radius: 3px; }