*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;font-family:Segoe UI,Tahoma,Arial,sans-serif;background:#1a1a1a;color:#fff}.app-container{display:flex;align-items:center;justify-content:center;height:100vh;padding:1rem}.card{background:#2e2e2e;padding:2rem;border-radius:12px;box-shadow:0 4px 12px #0009;text-align:center;width:100%;max-width:360px}.card h1{font-size:2rem;margin-bottom:1.5rem;color:#e0e0e0;font-weight:700}.price{font-size:1.25rem;margin-bottom:1.5rem;font-weight:500;color:#f4f4f4}.button-row{display:flex;justify-content:center;gap:.75rem;flex-wrap:wrap;margin-bottom:1.5rem}.button{flex:1 1 100px;padding:.8rem 1.2rem;border:none;border-radius:8px;font-weight:600;cursor:pointer;transition:background .2s,transform .2s;font-size:1rem}.button-up{background:#0f9d58;color:#fff}.button-down{background:#db4437;color:#fff}.button-confirm{background:#4285f4;color:#fff}.button.selected{transform:scale(1.05)}.button:disabled{opacity:.5;cursor:not-allowed}.countdown{color:#f4b400;margin-bottom:1.5rem;font-size:1.2rem;font-weight:600}.result{font-size:1.8rem;margin-top:1.5rem;font-weight:700;animation:fadeIn .4s ease-in-out}.price-win{color:#0f9d58}.price-loss{color:#db4437}.price-info{margin-top:1.5rem;display:flex;flex-direction:column;gap:1rem}.price-row{display:flex;justify-content:space-between}.price-label{font-weight:500;color:#ccc}.price-value{font-family:Courier New,Courier,monospace;font-size:1.3rem;font-weight:700}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.timer-icon{display:inline-block;animation:spin 2s linear infinite}.disclaimer{margin-top:2rem;font-size:.9rem;color:#999;text-align:center}