:root {
            --primary-blue: #3B82F6;
            --light-blue: #60A5FA;
            --white: #FFFFFF;
            --gray: #9CA3AF;
            --text-dark: #1F2937;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }
        
        .login-box {
            background: var(--white);
            padding: 3rem;
            border-radius: 20px;
            box-shadow: 0 20px 25px rgba(0, 0, 0, 0.15);
            max-width: 450px;
            width: 100%;
            animation: slideUp 0.5s ease;
        }
        
        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .login-header {
            text-align: center;
            margin-bottom: 2rem;
        }
        
        .login-header i {
            font-size: 3rem;
            color: var(--primary-blue);
            margin-bottom: 1rem;
        }
        
        .login-header h1 {
            color: var(--primary-blue);
            font-size: 2rem;
            margin-bottom: 0.5rem;
        }
        
        .login-header p {
            color: var(--gray);
        }
        
        /* DEMO ACCOUNTS BOX */
        .demo-accounts {
            background: linear-gradient(135deg, #F0F9FF, #E0F2FE);
            border: 2px solid var(--primary-blue);
            border-radius: 12px;
            padding: 1rem;
            margin-bottom: 1.5rem;
        }
        
        .demo-accounts h4 {
            color: var(--primary-blue);
            font-size: 0.9rem;
            margin-bottom: 0.8rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .demo-accounts h4 i {
            font-size: 1rem;
        }
        
        .demo-account-item {
            background: white;
            padding: 0.7rem;
            border-radius: 8px;
            margin-bottom: 0.5rem;
            border-left: 4px solid var(--primary-blue);
        }
        
        .demo-account-item:last-child {
            margin-bottom: 0;
        }
        
        .demo-account-label {
            font-size: 0.75rem;
            color: var(--gray);
            font-weight: 600;
            text-transform: uppercase;
            margin-bottom: 0.3rem;
        }
        
        .demo-credentials {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-family: 'Courier New', monospace;
        }
        
        .demo-credentials span {
            color: var(--text-dark);
            font-weight: 600;
            font-size: 0.9rem;
        }
        
        .demo-credentials small {
            color: var(--gray);
            font-size: 0.8rem;
        }
        
        .copy-btn {
            background: var(--primary-blue);
            color: white;
            border: none;
            padding: 0.3rem 0.6rem;
            border-radius: 5px;
            cursor: pointer;
            font-size: 0.75rem;
            transition: all 0.3s;
            margin-left: auto;
        }
        
        .copy-btn:hover {
            background: var(--light-blue);
            transform: scale(1.05);
        }
        
        .alert {
            padding: 1rem;
            border-radius: 10px;
            margin-bottom: 1.5rem;
            text-align: left;
            background-color: #FEE2E2;
            color: #DC2626;
            border: 1px solid #FCA5A5;
            animation: shake 0.5s;
        }
        
        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            25% { transform: translateX(-10px); }
            75% { transform: translateX(10px); }
        }
        
        .alert i {
            margin-right: 0.5rem;
        }
        
        .alert strong {
            display: block;
            margin-bottom: 0.5rem;
        }
        
        .form-group {
            margin-bottom: 1.5rem;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            color: var(--text-dark);
            font-weight: 500;
        }
        
        .form-group label i {
            margin-right: 0.3rem;
            color: var(--primary-blue);
        }
        
        .form-group input {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 2px solid #DBEAFE;
            border-radius: 10px;
            font-size: 1rem;
            transition: all 0.3s ease;
        }
        
        .form-group input:focus {
            outline: none;
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }
        
        .form-group input.error {
            border-color: #DC2626;
        }
        
        .password-toggle {
            position: relative;
        }
        
        .password-toggle i {
            position: absolute;
            right: 1rem;
            top: 50%;
            transform: translateY(-50%);
            cursor: pointer;
            color: var(--gray);
        }
        
        .password-toggle i:hover {
            color: var(--primary-blue);
        }
        
        .btn-login {
            width: 100%;
            padding: 1rem;
            background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
            color: var(--white);
            border: none;
            border-radius: 10px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .btn-login:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
        }
        
        .btn-login:active {
            transform: translateY(0);
        }
        
        .register-link {
            text-align: center;
            margin-top: 1.5rem;
            color: var(--gray);
        }
        
        .register-link a {
            color: var(--primary-blue);
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s;
        }
        
        .register-link a:hover {
            text-decoration: underline;
        }
        
        .back-home {
            text-align: center;
            margin-top: 1rem;
        }
        
        .back-home a {
            color: var(--gray);
            text-decoration: none;
            font-size: 0.9rem;
            transition: all 0.3s;
        }
        
        .back-home a:hover {
            color: var(--primary-blue);
        }
        
        .back-home a i {
            margin-right: 0.3rem;
        }