:root {
  color-scheme: light;
  --ink: #17383a;
  --muted: #5f6f6c;
  --paper: #f5ecd7;
  --paper-strong: #fffaf0;
  --steel: #263f45;
  --steel-light: #3d5d62;
  --amber: #d89635;
  --amber-bright: #f2b84b;
  --line: #c8b78f;
  --shadow: rgba(20, 42, 43, 0.18);
}

* { box-sizing: border-box; }

html { background: #152c30; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 50% -15%, rgba(86, 132, 129, 0.38), transparent 38rem),
    linear-gradient(180deg, #203f43 0, #142b2f 32rem, #102529 100%);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

a { color: #99601f; text-underline-offset: 0.18em; }
a:hover, a:focus-visible { color: #6b3f12; }

.shell {
  width: min(920px, calc(100% - 28px));
  margin: 0 auto;
  padding: 28px 0 64px;
}

.brand {
  color: #fff7df;
  text-align: center;
  padding: 28px 16px 24px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  margin: 0 auto 12px;
  border: 3px solid var(--amber-bright);
  border-radius: 18px;
  background: linear-gradient(145deg, var(--steel-light), var(--steel));
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.28), inset 0 0 0 3px rgba(255,255,255,0.06);
  font-size: 34px;
  font-weight: 900;
}

.brand h1 { margin: 0; font-size: clamp(2rem, 7vw, 3.25rem); letter-spacing: 0.035em; }
.brand p { margin: 2px 0 0; color: #d9e2d9; font-weight: 650; }

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin: 0 0 18px;
}

.nav a, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 9px 16px;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 999px;
  color: #fff8e8;
  background: rgba(255,255,255,0.08);
  font-weight: 750;
  text-decoration: none;
}

.nav a:hover, .nav a:focus-visible { background: rgba(255,255,255,0.16); color: white; }

.paper {
  padding: clamp(24px, 5vw, 52px);
  border: 2px solid var(--line);
  border-radius: 22px;
  background: var(--paper);
  box-shadow: 0 20px 48px var(--shadow), inset 0 0 0 5px rgba(255,255,255,0.38);
}

.paper h1 { margin: 0 0 4px; font-size: clamp(1.8rem, 5vw, 2.6rem); line-height: 1.15; }
.paper h2 { margin: 2rem 0 0.55rem; font-size: 1.35rem; color: #244a4c; }
.paper h3 { margin: 1.4rem 0 0.4rem; font-size: 1.05rem; }
.paper p, .paper li { max-width: 76ch; }
.paper ul, .paper ol { padding-left: 1.35rem; }
.paper li + li { margin-top: 0.4rem; }
.updated { color: var(--muted); margin: 0 0 1.8rem; }
.callout {
  margin: 1.5rem 0;
  padding: 16px 18px;
  border-left: 5px solid var(--amber);
  border-radius: 10px;
  background: var(--paper-strong);
}

.button {
  border-color: #8a591e;
  color: #1d3434;
  background: linear-gradient(#f3bd59, #d99531);
  box-shadow: 0 4px 0 #85531a;
}
.button:hover, .button:focus-visible { color: #102527; filter: brightness(1.06); }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 20px;
}
.card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255,255,255,0.38);
}
.card h2 { margin-top: 0; }

footer { color: #c7d4ce; text-align: center; padding: 20px 8px 0; font-size: 0.9rem; }
footer a { color: #f0c36a; }

code { word-break: break-word; }

@media (max-width: 520px) {
  .shell { width: min(100% - 16px, 920px); padding-top: 12px; }
  .brand { padding-top: 20px; }
  .paper { border-radius: 16px; }
}