* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.6;
            color: #2c3e50;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 2rem 0;
        }

        .registration-container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.15);
            max-width: 800px;
            width: 100%;
            margin: 0 2rem;
            overflow: hidden;
        }

        .registration-header {
            background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
            color: white;
            padding: 3rem 2rem;
            text-align: center;
            position: relative;
        }

        .registration-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="50" r="1" fill="white" opacity="0.05"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
        }

        .logo {
            font-size: 2rem;
            font-weight: bold;
            margin-bottom: 1rem;
            position: relative;
            z-index: 1;
        }

        .registration-title {
            font-size: 1.8rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            position: relative;
            z-index: 1;
        }

        .registration-subtitle {
            opacity: 0.9;
            font-size: 1.1rem;
            position: relative;
            z-index: 1;
        }

        .registration-form {
            padding: 3rem 2rem;
        }

        .progress-bar {
            width: 100%;
            height: 4px;
            background: #ecf0f1;
            border-radius: 2px;
            margin-bottom: 3rem;
            overflow: hidden;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(135deg, #3498db, #2980b9);
            width: 0%;
            transition: width 0.5s ease;
            border-radius: 2px;
        }

        .form-step {
            display: none;
        }

        .form-step.active {
            display: block;
        }

        .step-title {
            font-size: 1.5rem;
            color: #2c3e50;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }

        .step-subtitle {
            color: #7f8c8d;
            margin-bottom: 2rem;
        }

        .form-group {
            margin-bottom: 1.5rem;
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
        }

        label {
            display: block;
            margin-bottom: 0.5rem;
            color: #2c3e50;
            font-weight: 500;
        }

        .required {
            color: #e74c3c;
        }

        input[type="text"],
        input[type="email"],
        input[type="tel"],
        input[type="date"],
        input[type="password"],
        select,
        textarea {
            width: 100%;
            padding: 1rem;
            border: 2px solid #ecf0f1;
            border-radius: 10px;
            font-size: 1rem;
            transition: all 0.3s ease;
            background: #fafbfc;
        }

        input[type="text"]:focus,
        input[type="email"]:focus,
        input[type="tel"]:focus,
        input[type="date"]:focus,
        input[type="password"]:focus,
        select:focus,
        textarea:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
            background: white;
            transform: translateY(-2px);
        }

        .password-input-wrapper {
            position: relative;
        }

        .password-toggle {
            position: absolute;
            right: 1rem;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: #7f8c8d;
            cursor: pointer;
            padding: 0.5rem;
        }

        .interests-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            margin-top: 1rem;
        }

        .interest-item {
            display: flex;
            align-items: center;
            padding: 0.75rem;
            background: #f8f9fa;
            border: 2px solid #ecf0f1;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .interest-item:hover {
            border-color: #3498db;
            background: #ebf3fd;
        }

        .interest-item input[type="checkbox"] {
            margin-right: 0.75rem;
            width: auto;
        }

        .interest-item.checked {
            border-color: #3498db;
            background: #ebf3fd;
        }

        .privacy-notice {
            background: #f8f9fa;
            border: 1px solid #dee2e6;
            border-radius: 10px;
            padding: 1.5rem;
            margin: 2rem 0;
            font-size: 0.9rem;
            color: #6c757d;
            line-height: 1.6;
        }

        .privacy-notice h4 {
            color: #495057;
            margin-bottom: 0.5rem;
        }

        .checkbox-group {
            display: flex;
            align-items: flex-start;
            gap: 0.75rem;
            margin-bottom: 1rem;
        }

        .checkbox-group input[type="checkbox"] {
            width: auto;
            margin-top: 0.2rem;
        }

        .checkbox-group label {
            margin-bottom: 0;
            cursor: pointer;
        }

        .btn-group {
            display: flex;
            gap: 1rem;
            margin-top: 2rem;
        }

        .btn {
            padding: 1rem 2rem;
            border: none;
            border-radius: 10px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            flex: 1;
        }

        .btn-primary {
            background: linear-gradient(135deg, #3498db, #2980b9);
            color: white;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(52, 152, 219, 0.3);
        }

        .btn-secondary {
            background: #ecf0f1;
            color: #2c3e50;
        }

        .btn-secondary:hover {
            background: #d5dbdb;
        }

        .btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none !important;
        }

        .success-message {
            text-align: center;
            padding: 2rem;
            display: none;
        }

        .success-message.show {
            display: block;
        }

        .success-icon {
            width: 80px;
            height: 80px;
            background: #27ae60;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 2rem;
        }

        .login-link {
            text-align: center;
            margin-top: 2rem;
            padding-top: 2rem;
            border-top: 1px solid #ecf0f1;
            color: #7f8c8d;
        }

        .login-link a {
            color: #3498db;
            text-decoration: none;
            font-weight: 600;
        }

        .login-link a:hover {
            text-decoration: underline;
        }

        .password-strength {
            margin-top: 0.5rem;
            font-size: 0.85rem;
        }

        .strength-weak { color: #e74c3c; }
        .strength-medium { color: #f39c12; }
        .strength-strong { color: #27ae60; }

        /* Responsive Design */
        @media (max-width: 768px) {
            body {
                padding: 1rem 0;
            }

            .registration-container {
                margin: 0 1rem;
            }

            .registration-header,
            .registration-form {
                padding: 2rem 1.5rem;
            }

            .form-row {
                grid-template-columns: 1fr;
            }

            .interests-grid {
                grid-template-columns: 1fr;
            }

            .btn-group {
                flex-direction: column;
            }

            .registration-title {
                font-size: 1.5rem;
            }

            .step-title {
                font-size: 1.3rem;
            }
        }