:root{--bg:#0a0a0a;--fg:#f5f5f5;--muted:#9ca3af;--accent:#ffffff;--card:#131313;--border:#1f1f1f;--primary:#ffffff;--primary-fg:#0a0a0a;--radius:12px}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Inter,Segoe UI,Roboto,sans-serif;font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}a{color:inherit}main{min-height:100vh;padding:48px 24px;max-width:720px;margin:0 auto}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px}.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:10px 20px;font-weight:600;font-size:14px;cursor:pointer;border:1px solid var(--border);background:var(--primary);color:var(--primary-fg);text-decoration:none}.btn-secondary{background:transparent;color:var(--fg)}.muted{color:var(--muted)}