body { 
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            display: flex; 
            justify-content: center; 
            align-items: center; 
            min-height: 100vh; 
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            margin: 0;
        }
        
        .login-container { 
            background: white; 
            padding: 3rem; 
            border-radius: 15px; 
            box-shadow: 0 10px 30px rgba(0,0,0,0.2); 
            width: 400px; 
            max-width: 90vw;
        }
        
        .logo {
            text-align: center;
            margin-bottom: 2rem;
        }
        
        .logo h1 {
            color: #667eea;
            margin: 0;
            font-size: 2em;
            text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
        }
        
        .logo p {
            color: #666;
            margin: 0.5em 0 0 0;
            font-size: 0.9em;
        }
        
        .welcome-message {
            text-align: center;
            margin-bottom: 2rem;
        }
        
        .welcome-message h2 {
            color: #333;
            margin-bottom: 0.5rem;
            font-size: 1.5em;
        }
        
        .welcome-message p {
            color: #666;
            font-size: 0.9em;
        }
        
        form p { 
            margin-bottom: 1.5rem; 
        }
        
        label { 
            display: block; 
            margin-bottom: 8px; 
            color: #333;
            font-weight: 600;
            font-size: 0.9em;
        }
        
        input[type="text"], input[type="password"] { 
            width: 100%; 
            padding: 15px; 
            box-sizing: border-box; 
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 1em;
            transition: all 0.3s ease;
            background: #f8f9fa;
        }
        
        input:focus {
            outline: none;
            border-color: #667eea;
            background: white;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }
        
        button { 
            width: 100%; 
            padding: 15px; 
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); 
            color: white; 
            border: none; 
            border-radius: 10px; 
            cursor: pointer; 
            font-size: 1.1em;
            font-weight: 600;
            transition: all 0.3s ease;
            margin-top: 1rem;
        }
        
        button:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }
        
        button:active {
            transform: translateY(0);
        }
        
        .error-message {
            background: #f8d7da;
            border: 1px solid #f5c6cb;
            color: #721c24;
            padding: 1rem;
            border-radius: 8px;
            margin-bottom: 1.5rem;
            text-align: center;
            font-size: 0.9em;
        }
        
        .register-link {
            text-align: center;
            margin-top: 2rem;
            padding-top: 2rem;
            border-top: 1px solid #e0e0e0;
        }
        
        .register-link p {
            color: #666;
            margin-bottom: 1rem;
        }
        
        .register-link a {
            color: #667eea;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1em;
            transition: color 0.3s ease;
        }
        
        .register-link a:hover {
            color: #5a6fd8;
            text-decoration: underline;
        }
        
        .back-home {
            text-align: center;
            margin-top: 1rem;
        }
        
        .back-home a {
            color: #999;
            text-decoration: none;
            font-size: 0.9em;
            transition: color 0.3s ease;
        }
        
        .back-home a:hover {
            color: #667eea;
        }
        
        .features-hint {
            background: #e8f4fd;
            border-left: 4px solid #667eea;
            padding: 1rem;
            margin-bottom: 1.5rem;
            border-radius: 0 8px 8px 0;
        }
        
        .features-hint h4 {
            margin: 0 0 0.5rem 0;
            color: #333;
            font-size: 0.9em;
        }
        
        .features-hint ul {
            margin: 0;
            padding-left: 1.2rem;
            color: #666;
            font-size: 0.85em;
        }
        
        .features-hint ul li {
            margin-bottom: 0.3rem;
        }
        
        @media (max-width: 480px) {
            .login-container {
                padding: 2rem;
                margin: 1rem;
            }
            
            .logo h1 {
                font-size: 1.8em;
            }
        }