:root { --bg: #1a1a1a; --fg: #f2f2f2; --accent: #4f9d69; --checker: repeating-conic-gradient(#e8e8e8 0% 25%, #f7f7f7 0% 50%) 0 0 / 24px 24px; } * { box-sizing: border-box; } body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--fg); } button { font: inherit; padding: 0.6rem 1rem; border: 0; border-radius: 8px; background: var(--accent); color: #04140b; font-weight: 600; cursor: pointer; } button:disabled { opacity: 0.5; cursor: not-allowed; }