:root {
            --primary-blue: #1f2a6d;
            --secondary-blue: #66b3c6;
            --light-bg: #f4f8ff;
        }
        
        body {
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        .register-container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            overflow: hidden;
            width: 100%;
            max-width: 450px;
        }
        
        .register-header {
            background: var(--primary-blue);
            color: white;
            padding: 30px;
            text-align: center;
        }
        
        .register-header h1 {
            margin: 0;
            font-size: 1.8rem;
            font-weight: 700;
        }
        
        .register-header p {
            margin: 10px 0 0;
            opacity: 0.9;
        }
        
        .register-body {
            padding: 30px;
        }
        
        .form-control {
            border-radius: 10px;
            padding: 12px 15px;
            border: 2px solid #e2e8f0;
            margin-bottom: 20px;
            transition: all 0.3s ease;
        }
        
        .form-control:focus {
            border-color: var(--secondary-blue);
            box-shadow: 0 0 0 3px rgba(102, 179, 198, 0.2);
        }
        
        .btn-register {
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
            color: white;
            border: none;
            border-radius: 10px;
            padding: 12px;
            font-weight: 600;
            width: 100%;
            transition: all 0.3s ease;
        }
        
        .btn-register:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        
        .login-link {
            text-align: center;
            margin-top: 20px;
        }
        
        .alert {
            border-radius: 10px;
            margin-bottom: 20px;
        }
        
        .password-strength {
            font-size: 0.8rem;
            margin-top: -15px;
            margin-bottom: 15px;
        }