:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #1b2433;
  --muted: #5b6676;
  --navy: #182c4a;
  --accent: #2ec4b6;
  --border: #dde2ea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1a2b;
    --card: #15243d;
    --text: #ebf0f6;
    --muted: #a0acbe;
    --navy: #182c4a;
    --border: #27405f;
  }
}

* { box-sizing: border-box; }

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

header {
  background: var(--navy);
  color: #ebf0f6;
  padding: 20px 16px;
}

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

header a { color: inherit; text-decoration: none; font-weight: 600; }
header nav { display: inline; }
header nav a { margin-left: 20px; font-weight: 400; color: #a0acbe; }
header nav a:hover { color: #ebf0f6; }

main { padding: 32px 16px 48px; }

h1 { font-size: 1.8rem; margin: 0 0 8px; }
h2 { font-size: 1.2rem; margin: 28px 0 8px; }
p, li { margin: 0 0 12px; }
.muted { color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 24px 0;
}

.card h2 { margin-top: 0; }

.button {
  display: inline-block;
  background: var(--accent);
  color: #0f1a2b;
  padding: 10px 18px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}

footer {
  padding: 0 16px 40px;
  color: var(--muted);
  font-size: 0.9rem;
}