:root{--text:#0f172a;--muted:#64748b;--page-bg:#f8fafc;--card-bg:#ffffff;--card-border:#e2e8f0}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--page-bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}.page-card{max-width:1100px;margin:24px auto;padding:22px 24px;background:var(--card-bg);border:1px solid var(--card-border);border-radius:14px;box-shadow:0 4px 12px rgba(15,23,42,.05)}@media (max-width:768px){.page-card{margin:12px;padding:14px;border-radius:10px}}