.btn{padding:.5rem .8rem;background:#334155;border-radius:.7rem}.btn:hover{background:#475569}.btn-green{padding:.5rem .8rem;background:#16a34a;border-radius:.7rem}.btn-red{padding:.5rem .8rem;background:#dc2626;border-radius:.7rem}.card{background:#0f172a;border:1px solid #1e293b;border-radius:1rem;padding:1rem}.playing-card{width:64px;height:92px;border-radius:10px;background:#fff;color:#111;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:22px;box-shadow:0 8px 18px #0006}.card-back{background:linear-gradient(135deg,#991b1b,#f59e0b);color:#fff}.heart,.diamond{color:#dc2626}.spade,.club{color:#111827}input,select{color:#111} .toast{position:fixed;right:16px;bottom:16px;background:#111827;border:1px solid #334155;padding:12px 16px;border-radius:12px}