:root {
  --ground: #f3f5f1;
  --ink: #10231f;
  --muted: #55645f;
  --accent: #0e6b5c;
  --card: #ffffff;
  --line: #e1e7e2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #10231f;
    --ink: #eef3f0;
    --muted: #b9ccc5;
    --accent: #7fe0c4;
    --card: #17302b;
    --line: #2c433e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
}

main {
  max-width: 34rem;
  margin: 0 auto;
  padding: 2.5rem 1rem 3rem;
}

h1 { font-size: 2rem; line-height: 1.15; margin: 0 0 0.75rem; letter-spacing: -0.02em; }
p { margin: 0 0 1rem; }
.muted { color: var(--muted); font-size: 0.95rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1.25rem;
  margin: 1.5rem 0;
}

.code {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  word-break: break-all;
  background: var(--ground);
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  padding: 0.6rem 0.75rem;
  margin: 0.75rem 0;
}

button {
  min-height: 2.75rem;
  padding: 0 1.25rem;
  border: 0;
  border-radius: 0.75rem;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

@media (prefers-color-scheme: dark) {
  button { color: #10231f; }
}

ol { padding-left: 1.25rem; margin: 0 0 1rem; }
li { margin-bottom: 0.4rem; }