* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 2rem;
        }
        .container {
            background: rgba(255, 255, 255, 0.95);
            border-radius: 20px;
            padding: 2rem;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            backdrop-filter: blur(10px);
            max-width: 600px;
            width: 100%;
        }
        .screen {
            display: none;
        }
        .screen.active {
            display: block;
        }
        h1 {
            color: #333;
            margin-bottom: 1.5rem;
            font-size: 2.5rem;
            background: linear-gradient(45deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-align: center;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            color: #555;
            font-weight: 600;
            font-size: 1rem;
        }
        input, select {
            width: 100%;
            padding: 12px 15px;
            font-size: 1rem;
            border: 2px solid #ddd;
            border-radius: 10px;
            transition: all 0.3s ease;
        }
        input:focus, select:focus {
            outline: none;
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }
        .btn {
            background: linear-gradient(45deg, #667eea, #764ba2);
            color: white;
            border: none;
            padding: 15px 30px;
            font-size: 1.1rem;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(0,0,0,0.2);
            width: 100%;
            margin-top: 1rem;
        }
        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.3);
        }
        .btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }
        .code-display {
            background: #f8f9fa;
            padding: 2rem;
            border-radius: 15px;
            text-align: center;
            margin: 2rem 0;
        }
        .participant-code {
            font-size: 3rem;
            font-weight: bold;
            color: #667eea;
            margin: 1rem 0;
            letter-spacing: 2px;
        }
        .success-message {
            color: #555;
            font-size: 1.1rem;
            margin-bottom: 1rem;
        }
        .error-message {
            background: rgba(255, 0, 0, 0.1);
            color: #d32f2f;
            padding: 1rem;
            border-radius: 10px;
            margin-bottom: 1rem;
            display: none;
        }
        .privacy-notice {
            background: #e8eaf6;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0 1.5rem 0;
            border-left: 4px solid #667eea;
        }
        .privacy-notice h3 {
            color: #667eea;
            font-size: 1.1rem;
            margin-bottom: 1rem;
        }
        .privacy-notice p {
            color: #555;
            font-size: 0.95rem;
            line-height: 1.6;
            margin-bottom: 0.8rem;
        }
        .privacy-notice p:last-child {
            margin-bottom: 0;
        }
        .checkbox-group {
            margin: 1.5rem 0;
        }
        .checkbox-label {
            display: flex;
            align-items: center;
            cursor: pointer;
            font-weight: normal;
        }
        .checkbox-label input[type="checkbox"] {
            width: auto;
            margin-right: 0.8rem;
            cursor: pointer;
            width: 20px;
            height: 20px;
        }
        .checkbox-label span {
            color: #555;
            font-weight: 500;
        }