:root {
  --cream: #fff8eb;
  --paper: #fffefb;
  --ink: #171717;
  --muted: #5c5a55;
  --coral: #ff625c;
  --teal: #087f75;
  --line: #17171726;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.55;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 32px 16px 48px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  font-size: 20px;
  text-decoration: none;
}

.brand-icon {
  width: 40px;
  height: 40px;
  border: 2px solid var(--ink);
  border-radius: 10px;
}

.brand-by {
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

.hero img {
  display: block;
  width: 100%;
  height: auto;
  margin: 8px 0 20px;
  border: 2px solid var(--ink);
  border-radius: 18px;
}

h1 {
  font-size: 30px;
  line-height: 1.2;
  margin: 28px 0 8px;
}

h2 {
  font-size: 21px;
  margin: 32px 0 8px;
}

a {
  color: var(--teal);
}

.card {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 14px;
  padding: 20px;
  margin: 24px 0;
}

.code {
  font-size: 40px;
  font-weight: 900;
  letter-spacing: 6px;
  margin: 4px 0 16px;
}

.button {
  display: block;
  min-height: 52px;
  padding: 14px 18px;
  border: 3px solid var(--ink);
  border-radius: 12px;
  background: var(--coral);
  color: var(--ink);
  font-weight: 800;
  font-size: 18px;
  text-align: center;
  text-decoration: none;
}

.button:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 3px;
}

.muted {
  color: var(--muted);
}

footer {
  border-top: 1px solid var(--line);
  margin-top: 40px;
  padding-top: 16px;
  font-size: 15px;
}

footer a {
  margin-right: 16px;
}