:root {
  --bg: #111827;
  --card: #1f2937;
  --text: #f9fafb;
  --muted: #9ca3af;
  --accent: #4fd1c5;
  --border: #374151;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

header, main, footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.brand { color: var(--text); font-size: 22px; font-weight: 700; text-decoration: none; }
nav a { color: var(--muted); margin-left: 16px; text-decoration: none; }
nav a:hover, a { color: var(--accent); }

h1 { font-size: 32px; margin: 40px 0 12px; }
h2 { font-size: 20px; margin-top: 32px; }
.lead { color: var(--muted); font-size: 18px; }

.features { list-style: none; padding: 0; display: grid; gap: 12px; margin: 28px 0; }
.features li { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; }
.features strong { display: block; color: var(--accent); }

.note { color: var(--muted); font-size: 14px; }

footer { color: var(--muted); font-size: 14px; padding-top: 24px; padding-bottom: 40px; border-top: 1px solid var(--border); margin-top: 40px; }