body { font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; margin: 0; padding: 0; background: #0f172a; color: #e2e8f0; }
.container { max-width: 720px; margin: 0 auto; padding: 40px 20px; }
h1 { margin: 0 0 12px; font-size: 28px; }
p { margin: 0 0 20px; color: #cbd5e1; }
button { background: #22c55e; color: #0f172a; border: none; padding: 12px 18px; border-radius: 8px; font-weight: 700; cursor: pointer; }
button:hover { background: #16a34a; }