*{box-sizing:border-box;padding:0;margin:0}body,html{max-width:100vw;overflow-x:hidden;font-family:system-ui,sans-serif;background-color:#f0f0f0}.username-container,body{display:flex;justify-content:center;align-items:center;min-height:100vh;padding:20px}.username-card{background:#fff;border-radius:15px;padding:40px;box-shadow:0 8px 32px rgba(0,0,0,.1);max-width:500px;width:100%;text-align:center}.game-title{font-size:2.5rem;color:#1f2937;margin-bottom:15px;font-weight:700}.game-description{font-size:1.1rem;color:#6b7280;line-height:1.6}.game-description,.username-form{margin-bottom:30px}.input-group{margin-bottom:20px}.input-label{display:block;font-size:1.1rem;font-weight:600;color:#374151;margin-bottom:10px}.username-input{width:100%;padding:12px 16px;font-size:16px;border:2px solid #d1d5db;border-radius:8px;transition:border-color .2s ease;background-color:#fff}.username-input:focus{outline:none;border-color:#3b82f6;box-shadow:0 0 0 3px 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