:root {
  --bg: #f7f7f5;
  --fg: #1d1d1f;
  --muted: #6b6b70;
  --accent: #2f6fed;
  --card: #ffffff;
  --border: #e3e3e0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

nav {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

nav .brand {
  font-weight: 700;
  margin-right: auto;
}

nav a {
  color: var(--muted);
  text-decoration: none;
}

nav a:hover,
nav a[aria-current="page"] {
  color: var(--accent);
}

main {
  max-width: 800px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

h1 {
  margin-top: 0;
  font-size: 2.25rem;
  line-height: 1.2;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1.2rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
}

.button:hover {
  opacity: 0.9;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
  padding: 2rem 1.5rem;
}