:root {
  --paper: #f6f1e8;
  --ink: #1b2420;
  --ink-soft: #3d4a44;
  --sea: #0f5c56;
  --sea-deep: #0a3d39;
  --clay: #c45c26;
  --line: #d9cfc0;
  --font-sans: ui-sans-serif, system-ui, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-display: Georgia, "Iowan Old Style", "Palatino Linotype", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(15, 92, 86, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(196, 92, 38, 0.07), transparent),
    var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.55;
}
a { color: var(--sea-deep); }
a:hover { color: var(--clay); }
header {
  border-bottom: 1px solid var(--line);
  background: rgba(246, 241, 232, 0.92);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.wrap { width: min(920px, calc(100% - 2rem)); margin: 0 auto; }
.brand-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.9rem 0;
}
.brand {
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--ink);
}
.brand span { color: var(--sea); font-size: 0.85rem; font-family: var(--font-sans); margin-left: 0.5rem; }
nav { display: flex; flex-wrap: wrap; gap: 0.65rem 1rem; }
nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.92rem;
}
nav a[aria-current="page"] { color: var(--sea-deep); font-weight: 600; }
main { padding: 2rem 0 3.5rem; }
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 560;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); margin: 0 0 0.75rem; }
h2 { font-size: 1.35rem; margin: 2rem 0 0.6rem; }
p, li { color: var(--ink-soft); }
.lede { font-size: 1.08rem; max-width: 40rem; }
.note {
  border: 1px solid var(--line);
  border-left: 4px solid var(--sea);
  background: rgba(15, 92, 86, 0.05);
  padding: 0.85rem 1rem;
  margin: 1.25rem 0;
  border-radius: 0 8px 8px 0;
}
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.card {
  display: block;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  background: rgba(255, 255, 255, 0.35);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--sea); transform: translateY(-1px); }
.card strong { display: block; color: var(--ink); margin-bottom: 0.35rem; font-family: var(--font-display); }
.card span { font-size: 0.92rem; color: var(--ink-soft); }
ol, ul { padding-left: 1.2rem; }
li { margin: 0.35rem 0; }
.steps { counter-reset: step; list-style: none; padding: 0; }
.steps li {
  position: relative;
  padding: 0.85rem 0 0.85rem 3rem;
  border-bottom: 1px solid var(--line);
}
.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.85rem;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  background: var(--sea);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 600;
}
.frame {
  margin: 1rem 0 0.5rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: #0b1210;
  min-height: 420px;
}
.frame iframe { width: 100%; height: 70vh; min-height: 420px; border: 0; display: block; }
.meta { font-size: 0.85rem; color: var(--ink-soft); }
footer {
  border-top: 1px solid var(--line);
  padding: 1.25rem 0 2rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}
code, kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: rgba(27, 36, 32, 0.06);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}