:root {
  --bg: #f4f6f8;
  --ink: #121a21;
  --muted: #55666f;
  --accent: #0d7a6f;
  --accent-hover: #0a635a;
  --sidebar: #0f1c24;
  --line: rgba(21, 32, 40, 0.1);
  --paper: #fff;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 960px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
}
.nav nav { display: flex; gap: 1.25rem; align-items: center; }
.nav a { color: var(--ink); text-decoration: none; font-size: 0.95rem; }
.mark {
  font-weight: 700;
  letter-spacing: -0.03em;
  font-size: 1.25rem;
}
.mark span { font-weight: 500; }

main { max-width: 960px; margin: 0 auto; padding: 0 1.5rem 4rem; }

.hero { padding: 3.5rem 0 3rem; max-width: 38rem; }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 0.75rem;
}
h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
}
.lede { color: var(--muted); font-size: 1.125rem; margin: 0 0 1.75rem; }
.actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 0.65rem 1.1rem;
  border-radius: 0.6rem;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
}
.btn-primary { background: var(--accent); color: #f5fffc; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-ghost { color: var(--ink); border: 1px solid var(--line); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1rem;
}
.grid article {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  padding: 1.25rem 1.35rem;
}
.grid h2, .how h2 { font-size: 1.15rem; letter-spacing: -0.02em; margin: 0 0 0.5rem; }
.grid p { margin: 0; color: var(--muted); }

.how { margin-top: 3rem; }
.how ol { padding-left: 1.2rem; color: var(--muted); }

footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}
footer a { color: var(--accent); }

@media (max-width: 640px) {
  .nav nav a:not(.btn) { display: none; }
}