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

        :root {
            --primary-color: #022342;
            --primary-light: #034a6b;
            --accent-color: #3b82f6;
            --danger-color: #ef4444;
            --success-color: #10b981;
            --warning-color: #f59e0b;
            --white: #ffffff;
            --gray-50: #f9fafb;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-300: #d1d5db;
            --gray-400: #9ca3af;
            --gray-500: #6b7280;
            --gray-600: #4b5563;
            --gray-700: #374151;
            --gray-800: #1f2937;
            --gray-900: #111827;
            --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--gray-900);
        }

        .auth-container {
            background: var(--white);
            border-radius: 20px;
            box-shadow: var(--shadow-lg);
            width: 100%;
            max-width: 480px;
            padding: 3rem;
            margin: 1rem;
            position: relative;
            overflow: hidden;
        }

        .auth-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 6px;
            background: linear-gradient(90deg, var(--accent-color) 0%, var(--primary-color) 100%);
        }

        .logo-section {
            text-align: center;
            margin-bottom: 2.5rem;
        }

        .logo {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
            font-size: 2rem;
            color: var(--white);
            font-weight: bold;
        }

        .auth-title {
            font-size: 1.875rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }

        .auth-subtitle {
            color: var(--gray-600);
            font-size: 1rem;
        }

        .auth-form {
            margin-bottom: 2rem;
        }

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

        .form-label {
            display: block;
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--gray-700);
            margin-bottom: 0.5rem;
        }

        .form-input {
            width: 100%;
            padding: 0.875rem 1rem;
            border: 2px solid var(--gray-200);
            border-radius: 12px;
            font-size: 1rem;
            transition: all 0.3s ease;
            background: var(--white);
        }

        .form-input:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }

        .form-input.error {
            border-color: var(--danger-color);
            box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
        }

        .error-message {
            color: var(--danger-color);
            font-size: 0.875rem;
            margin-top: 0.5rem;
            display: none;
        }

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

        .success-message {
            color: var(--success-color);
            font-size: 0.875rem;
            margin-top: 0.5rem;
            display: none;
        }

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

        .btn {
            width: 100%;
            padding: 0.875rem 1.5rem;
            border: none;
            border-radius: 12px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            color: var(--white);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .btn-secondary {
            background: var(--gray-100);
            color: var(--gray-700);
            border: 2px solid var(--gray-200);
        }

        .btn-secondary:hover {
            background: var(--gray-200);
        }

        .auth-links {
            text-align: center;
            margin-top: 1.5rem;
        }

        .auth-link {
            color: var(--accent-color);
            text-decoration: none;
            font-weight: 500;
            font-size: 0.875rem;
            transition: color 0.3s ease;
        }

        .auth-link:hover {
            color: var(--primary-color);
        }

        .divider {
            display: flex;
            align-items: center;
            margin: 1.5rem 0;
        }

        .divider::before,
        .divider::after {
            content: '';
            flex: 1;
            height: 1px;
            background: var(--gray-200);
        }

        .divider span {
            padding: 0 1rem;
            color: var(--gray-500);
            font-size: 0.875rem;
        }

        .checkbox-group {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            margin-bottom: 1.5rem;
        }

        .checkbox {
            width: 18px;
            height: 18px;
            cursor: pointer;
        }

        .checkbox-label {
            font-size: 0.875rem;
            color: var(--gray-600);
            cursor: pointer;
        }

        /* Page States */
        .page {
            display: none;
        }

        .page.active {
            display: block;
        }

        /* Loading state */
        .btn.loading {
            opacity: 0.7;
            cursor: not-allowed;
        }

        .btn.loading::after {
            content: '';
            width: 16px;
            height: 16px;
            border: 2px solid transparent;
            border-top: 2px solid currentColor;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin-left: 0.5rem;
        }

        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }

        /* Responsive */
        @media (max-width: 640px) {
            .auth-container {
                padding: 2rem 1.5rem;
                margin: 0.5rem;
            }

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

            .logo {
                width: 60px;
                height: 60px;
                font-size: 1.5rem;
            }
        }

        /* Animations */
        @keyframes slideInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .auth-container {
            animation: slideInUp 0.6s ease-out;
        }

        .form-group {
            animation: slideInUp 0.6s ease-out;
            animation-fill-mode: both;
        }

        .form-group:nth-child(1) { animation-delay: 0.1s; }
        .form-group:nth-child(2) { animation-delay: 0.2s; }
        .form-group:nth-child(3) { animation-delay: 0.3s; }
        .form-group:nth-child(4) { animation-delay: 0.4s; }