:root {
            --primary-color: #003366;
            --secondary-color: #f8f9fa;
            --accent-color: #4CAF50;
        }
        
        body {
            font-family: 'Manrope', sans-serif;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
        }
        
        .header {
            background: white;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 3px solid var(--primary-color);
        }
        
        .logo-container {
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .logo-icon {
            background: var(--primary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
        }
        
        .nav-menu {
            display: flex;
            gap: 20px;
        }
        
        .nav-item {
            padding: 10px 15px;
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
            border-radius: 5px;
            transition: all 0.3s ease;
        }
        
        .nav-item:hover {
            background: rgba(0, 51, 102, 0.1);
        }
        
        .nav-item.active {
            background: var(--primary-color);
            color: white;
        }
        
        .main-container {
            max-width: 450px;
            margin: 0 auto;
            padding: 40px 20px;
        }
        
        .login-card {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }
        
        .card-header {
            background: var(--primary-color);
            color: white;
            padding: 30px;
            text-align: center;
        }
        
        .card-body {
            padding: 30px;
        }
        
        .form-section {
            animation: fadeIn 0.5s ease;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .section-header {
            margin-bottom: 25px;
            border-bottom: 2px solid #f3f4f6;
            padding-bottom: 15px;
        }
        
        .section-title {
            font-size: 22px;
            font-weight: 700;
            color: var(--primary-color);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .section-description {
            color: #6b7280;
            margin-top: 5px;
            font-size: 14px;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #374151;
        }
        
        .required {
            color: #ef4444;
        }
        
        .form-input {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e5e7eb;
            border-radius: 8px;
            font-size: 16px;
            transition: all 0.3s ease;
        }
        
        .form-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(0, 51, 102, 0.1);
        }
        
        .form-input.error {
            border-color: #ef4444;
        }
        
        .password-container {
            position: relative;
        }
        
        .password-toggle {
            position: absolute;
            right: 15px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: #6b7280;
            cursor: pointer;
            font-size: 16px;
        }
        
        .error-message {
            color: #ef4444;
            font-size: 14px;
            margin-top: 5px;
            display: none;
        }
        
        .success-message {
            display: none;
            text-align: center;
            padding: 50px 20px;
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }
        
        .success-icon {
            font-size: 60px;
            color: var(--accent-color);
            margin-bottom: 20px;
        }
        
        .login-btn {
            width: 100%;
            padding: 15px;
            background: var(--primary-color);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            margin-top: 10px;
        }
        
        .login-btn:hover {
            background: #002244;
        }
        
        .login-btn:disabled {
            opacity: 0.7;
            cursor: not-allowed;
        }
        
        .loading-spinner {
            display: none;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255,255,255,0.3);
            border-top-color: white;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
        .register-link {
            text-align: center;
            margin-top: 25px;
            padding-top: 20px;
            border-top: 1px solid #e5e7eb;
            color: #6b7280;
            font-size: 14px;
        }
        
        .register-link a {
            color: var(--primary-color);
            font-weight: 600;
            text-decoration: none;
        }
        
        .register-link a:hover {
            text-decoration: underline;
        }
        
        .forgot-password {
            text-align: right;
            margin-top: -10px;
            margin-bottom: 20px;
        }
        
        .forgot-password a {
            color: var(--primary-color);
            font-size: 14px;
            text-decoration: none;
            font-weight: 500;
        }
        
        .forgot-password a:hover {
            text-decoration: underline;
        }
        
        .demo-account {
            background: #f0f9ff;
            border: 2px solid #dbeafe;
            border-radius: 8px;
            padding: 15px;
            margin-top: 25px;
            margin-bottom: 20px;
        }
        
        .demo-title {
            font-weight: 600;
            color: var(--primary-color);
            margin-bottom: 10px;
            font-size: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .demo-info {
            font-size: 13px;
            color: #6b7280;
            line-height: 1.5;
        }
        
        .demo-credentials {
            background: white;
            border-radius: 6px;
            padding: 10px;
            margin-top: 10px;
            font-family: 'Courier New', monospace;
            font-size: 13px;
        }
        
        /* Responsive */
        @media (max-width: 768px) {
            .main-container {
                padding: 20px 15px;
            }
            
            .card-body {
                padding: 20px;
            }
            
            .nav-menu {
                display: none;
            }
        }