:root {
  --ink: #1b1b1b;
  --muted: #5e5e5e;
  --line: #e2e2e2;
  --accent: #0c5ea8;
  --surface: #ffffff;
  --page: #fafafa;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 24px; }

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 28px;
  padding-bottom: 28px;
}

.brand { font-size: 18px; font-weight: 650; letter-spacing: -0.01em; }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 14px; }
nav a:hover { color: var(--accent); }

h1 { font-size: 34px; line-height: 1.25; letter-spacing: -0.02em; margin: 24px 0 12px; }
h2 { font-size: 20px; margin: 36px 0 10px; letter-spacing: -0.01em; }
h3 { font-size: 16px; margin: 24px 0 6px; }
p, li { color: #2c2c2c; }
.lead { font-size: 18px; color: var(--muted); }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
  margin: 20px 0;
}

.price { font-size: 30px; font-weight: 650; }
.price span { font-size: 15px; font-weight: 400; color: var(--muted); }

ol, ul { padding-left: 20px; }
li { margin: 6px 0; }

code {
  background: #f0f0f0;
  border-radius: 5px;
  padding: 1px 5px;
  font-size: 13px;
}

footer {
  border-top: 1px solid var(--line);
  margin-top: 56px;
  padding-top: 22px;
  padding-bottom: 48px;
  color: var(--muted);
  font-size: 14px;
}
footer a { color: var(--muted); }

.note {
  border-left: 3px solid var(--accent);
  padding: 2px 0 2px 14px;
  color: var(--muted);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #ececec; --muted: #9a9a9a; --line: #2c2c2c;
    --accent: #6cb2f0; --surface: #171717; --page: #101010;
  }
  p, li { color: #d2d2d2; }
  code { background: #232323; }
}