*{box-sizing:border-box}.app{min-height:100vh;background:linear-gradient(135deg,#1a202c,#2d3748);color:#f7fafc}.app-main{padding:2rem;max-width:1600px;margin:0 auto}.setup-screen{text-align:center;max-width:800px;margin:0 auto;background:#2d3748;padding:1rem;border-radius:12px;box-shadow:0 10px 30px #00000080}.setup-screen h2{margin-bottom:.5rem;color:#63b3ed}.error-message{color:#fc8181;margin-top:1rem;padding:1.25rem;background:#feb2b21a;border-radius:8px;border:2px solid #fc8181;display:flex;align-items:start;gap:1rem;text-align:left;animation:shake .5s ease-in-out}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-5px)}75%{transform:translate(5px)}}.error-icon{font-size:1.5rem;flex-shrink:0}.error-message strong{color:#fee;font-size:1.1rem}.error-hint{margin:.5rem 0 0;font-size:.9rem;opacity:.8}.rules{margin-top:1rem;text-align:left;background:#1a202c;padding:1.5rem;border-radius:8px}.rules 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