:root {
  --bg: #F5F2EA;
  --ink: #23241F;
  --ink2: #6E7065;
  --green: #3A4A2E;
  --green2: #2F3D24;
  --gold: #A9814F;
  --line: rgba(35, 36, 31, 0.13);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 400 16px/1.7 Jost, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--green2); }
a:hover { color: var(--gold); }

.sky {
  height: 150px;
  background: url(assets/onb-sky.png) center top / cover no-repeat;
  position: relative;
}
.sky::after {
  content: '';
  position: absolute; inset: auto 0 0 0; height: 80px;
  background: linear-gradient(180deg, rgba(245, 242, 234, 0), var(--bg) 88%);
}
.sky nav {
  position: relative; z-index: 1;
  max-width: 760px; margin: 0 auto; padding: 28px 24px 0;
  display: flex; align-items: center; justify-content: space-between;
}
.sky nav img { width: 104px; height: auto; display: block; }
.sky nav .links { display: flex; gap: 20px; font-size: 14px; }
.sky nav .links a { color: var(--green2); text-decoration: none; }

main { max-width: 760px; margin: 0 auto; padding: 8px 24px 64px; }
.kicker {
  font: 500 12px/1 Jost, sans-serif; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--gold); margin: 0;
}
h1, h2, h3 { font-family: 'Playfair Display', Georgia, serif; font-weight: 400; color: var(--green2); }
h1 { font-size: 42px; line-height: 1.15; margin: 14px 0 0; letter-spacing: -0.01em; }
h2 { font-size: 26px; line-height: 1.25; margin: 44px 0 0; }
h3 { font-size: 20px; line-height: 1.3; margin: 28px 0 0; color: var(--ink); }
.rule { width: 44px; height: 1px; background: var(--gold); margin: 26px 0; }
.meta { color: var(--ink2); font-size: 14px; margin: 18px 0 0; }
p, li { color: var(--ink); }
p { margin: 14px 0 0; }
ul { padding-left: 22px; margin: 12px 0 0; }
li { margin: 6px 0; }
.note {
  border: 1px solid var(--gold); padding: 18px 22px; margin: 26px 0 0;
  font-size: 15px; color: var(--ink);
}
.toc { columns: 2; column-gap: 32px; font-size: 15px; }
.toc a { text-decoration: none; }

.hero { text-align: center; padding-top: 10px; }
.hero img.sun { width: 40px; }
.hero h1 { font-size: 48px; }
.hero p { color: var(--ink2); font-size: 18px; max-width: 520px; margin: 18px auto 0; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 48px; }
.card { border: 1px solid var(--line); border-radius: 18px; padding: 22px; }
.card h3 { margin: 0; font-size: 22px; color: var(--green2); }
.card p { color: var(--ink2); font-size: 15px; margin-top: 8px; }

footer {
  max-width: 760px; margin: 0 auto; padding: 28px 24px 48px;
  border-top: 1px solid var(--line); color: var(--ink2); font-size: 14px;
  display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between;
}
footer a { color: var(--ink2); }

@media (max-width: 620px) {
  h1 { font-size: 34px; }
  .hero h1 { font-size: 38px; }
  .cards { grid-template-columns: 1fr; }
  .toc { columns: 1; }
  .sky nav .links { gap: 14px; }
}