.challenges-page{max-width:1200px;margin:0 auto;padding:20px}.challenges-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px;border-bottom:2px solid #333;padding-bottom:15px;min-width:400px}.challenges-header h1{margin:0;color:#fff;font-size:2rem}.refresh-btn{background:#007acc;color:#fff;border:none;padding:8px 16px;border-radius:4px;cursor:pointer;display:flex;align-items:center;gap:8px;font-size:14px;transition:background-color .2s}.refresh-btn:hover:not(:disabled){background:#005a9e}.refresh-btn:disabled{opacity:.6;cursor:not-allowed}.refresh-btn i{font-size:12px}.error-message{background:#f44;color:#fff;padding:12px;border-radius:4px;margin-bottom:20px;text-align:center}.challenges-section{margin-bottom:40px}.challenges-section h2{color:#fff;margin-bottom:20px;font-size:1.5rem;border-left:4px solid #007acc;padding-left:12px}.no-challenges{text-align:center;color:#ccc;font-style:italic;padding:40px;background:#ffffff0d;border-radius:8px;border:1px dashed #666}.loading-spinner{text-align:center;color:#ccc;padding:40px;font-size:18px}.loading-spinner i{font-size:24px;margin-bottom:10px;display:block}@media (max-width: 768px){.challenges-page{padding:15px}.challenges-header{flex-direction:column;gap:15px;align-items:stretch}.challenges-header h1{font-size:1.5rem;text-align:center}}