:root {
  color-scheme: dark;
  --bg: #07110d;
  --card: #0d1c16;
  --text: #e7f7ef;
  --muted: #a6c5b7;
  --accent: #10b981;
  --border: #1f3b30;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 32px 16px;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #12382b 0, var(--bg) 42%);
  color: var(--text);
  line-height: 1.6;
}

main {
  width: min(860px, 100%);
  margin: 0 auto;
  padding: 28px;
  background: rgba(13, 28, 22, 0.92);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

h1, h2 {
  line-height: 1.25;
}

h1 {
  margin-top: 0;
  font-size: 32px;
}

h2 {
  margin-top: 32px;
  color: var(--accent);
}

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

nav {
  display: grid;
  gap: 12px;
  margin: 24px 0;
}

nav a,
.back {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(16, 185, 129, 0.08);
  text-decoration: none;
}

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

footer {
  margin-top: 36px;
  color: var(--muted);
  font-size: 14px;
}