:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media(prefers-color-scheme:light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app{min-height:100vh}.screen-container{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2);padding:20px}.screen-card{background:#fff;border-radius:20px;padding:40px;max-width:480px;width:100%;box-shadow:0 20px 60px #0000004d}.logo{text-align:center;font-size:14px;font-weight:700;color:#667eea;letter-spacing:2px;margin-bottom:30px}.screen-title{font-size:32px;font-weight:800;color:#2d3748;text-align:center;margin-bottom:10px}.screen-subtitle{text-align:center;color:#718096;font-size:16px;margin-bottom:30px;line-height:1.6}.puid-badge{background:#edf2f7;color:#4a5568;text-align:center;padding:10px;border-radius:10px;font-weight:600;margin-bottom:20px;font-size:14px}.screen-form,.input-group{margin-bottom:20px}.input-label{display:block;font-weight:600;color:#2d3748;margin-bottom:8px;font-size:14px}.text-input{width:100%;padding:14px;font-size:16px;border:2px solid #e2e8f0;border-radius:10px;transition:all .2s;font-family:inherit;background:#fff;color:#2d3748}.text-input:focus{outline:none;border-color:#667eea;background:#fff}.text-input::placeholder{color:#a0aec0}.pin-input{width:100%;padding:14px;font-size:24px;border:2px solid #e2e8f0;border-radius:10px;transition:all .2s;letter-spacing:8px;text-align:center;font-family:inherit;background:#fff;color:#2d3748}.pin-input:focus{outline:none;border-color:#667eea;background:#fff}.pin-input::placeholder{color:#a0aec0;letter-spacing:normal;font-size:16px}.input-help{font-size:13px;color:#718096;margin-top:6px;line-height:1.4}.divider{height:1px;background:#e2e8f0;margin:24px 0}.submit-button{width:100%;padding:16px;font-size:18px;font-weight:700;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:10px;cursor:pointer;transition:all .3s;text-transform:uppercase;letter-spacing:1px}.submit-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 20px #667eea66}.submit-button:disabled{opacity:.5;cursor:not-allowed}.submit-button:active{transform:translateY(0)}.error-message{background:#fed7d7;color:#c53030;padding:12px;border-radius:8px;margin-bottom:16px;font-size:14px;text-align:center;font-weight:600}.help-text{text-align:center;font-size:13px;color:#718096;line-height:1.6}.help-text p{margin:8px 0}.info-box{text-align:center;background:#edf2f7;padding:12px;border-radius:8px;font-size:14px;color:#4a5568;margin-top:20px}.challenge-grid{display:flex;flex-direction:column;gap:20px;margin-bottom:20px}.challenge-card{background:#fff;border:3px solid #e2e8f0;border-radius:16px;padding:30px;text-align:center;cursor:pointer;transition:all .3s}.challenge-card:hover{border-color:#667eea;transform:translateY(-4px);box-shadow:0 12px 30px #667eea33}.challenge-icon{font-size:64px;margin-bottom:16px}.challenge-name{font-size:24px;font-weight:700;color:#2d3748;margin-bottom:12px}.challenge-description{font-size:15px;color:#718096;line-height:1.6;margin-bottom:20px}.challenge-button{display:inline-block;padding:12px 24px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-radius:8px;font-weight:700;font-size:14px;text-transform:uppercase;letter-spacing:1px}@media(max-width:600px){.screen-card{padding:30px 20px}.screen-title{font-size:28px}.screen-subtitle{font-size:14px}}