:root {
            --primary-blue: #1e3a5f;
            --primary-blue-dark: #152a45;
            --accent-green: #10b981;
            --accent-green-dark: #059669;
            --gray-light: #f8fafc;
            --gray-medium: #94a3b8;
            --gray-dark: #475569;
            --white: #ffffff;
        }

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

        body {
            font-family: 'Inter', sans-serif;
            background: var(--gray-light);
            min-height: 100vh;
        }

        .auth-container {
            display: flex;
            min-height: 100vh;
        }

        /* Panel izquierdo - Imagen */
        .auth-image-panel {
            display: none;
            width: 50%;
            background: linear-gradient(135deg, rgba(30, 58, 95, 0.9) 0%, rgba(21, 42, 69, 0.95) 100%),
                url('https://aunclicdelaaventura.com/wp-content/uploads/2019/02/Viajar-en-avion.jpg');
            background-size: cover;
            background-position: center;
            position: relative;
            padding: 3rem;
        }

        @media (min-width: 992px) {
            .auth-image-panel {
                display: flex;
                flex-direction: column;
                justify-content: space-between;
            }
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .brand-logo i {
            font-size: 2rem;
            color: var(--accent-green);
        }

        .brand-logo span {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--white);
        }

        .hero-content {
            max-width: 480px;
        }

        .hero-content h1 {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--white);
            line-height: 1.2;
            margin-bottom: 1.5rem;
        }

        .hero-content p {
            font-size: 1.125rem;
            color: rgba(255, 255, 255, 0.8);
            line-height: 1.7;
            margin-bottom: 2rem;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
            margin-top: 2rem;
        }

        .stat-item {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 12px;
            padding: 1.25rem;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .stat-item h3 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--accent-green);
            margin-bottom: 0.25rem;
        }

        .stat-item p {
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.8);
            margin: 0;
        }

        .image-footer {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.875rem;
        }

        /* Panel derecho - Formulario */
        .auth-form-panel {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 2rem;
            background: var(--white);
            overflow-y: auto;
        }

        @media (min-width: 992px) {
            .auth-form-panel {
                width: 50%;
            }
        }

        .form-wrapper {
            width: 100%;
            max-width: 480px;
            padding: 1rem 0;
        }

        .mobile-brand {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            margin-bottom: 1.5rem;
        }

        @media (min-width: 992px) {
            .mobile-brand {
                display: none;
            }
        }

        .mobile-brand i {
            font-size: 2rem;
            color: var(--primary-blue);
        }

        .mobile-brand span {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-blue);
        }

        .form-header {
            text-align: center;
            margin-bottom: 1.5rem;
        }

        .form-header h2 {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 0.5rem;
        }

        .form-header p {
            color: var(--gray-medium);
            font-size: 0.95rem;
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1rem;
        }

        @media (min-width: 576px) {
            .form-row {
                grid-template-columns: 1fr 1fr;
            }
        }

        .form-group {
            margin-bottom: 1rem;
        }

        .form-group.full-width {
            grid-column: 1 / -1;
        }

        .form-group label {
            display: block;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--gray-dark);
            margin-bottom: 0.4rem;
        }

        .input-wrapper {
            position: relative;
        }

        .input-wrapper i {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray-medium);
            font-size: 1rem;
            transition: color 0.3s ease;
        }

        .form-control-custom {
            width: 100%;
            padding: 0.8rem 1rem 0.8rem 2.75rem;
            font-size: 0.95rem;
            border: 2px solid #e2e8f0;
            border-radius: 10px;
            background: var(--gray-light);
            transition: all 0.3s ease;
            font-family: 'Inter', sans-serif;
        }

        .form-control-custom:focus {
            outline: none;
            border-color: var(--primary-blue);
            background: var(--white);
            box-shadow: 0 0 0 4px rgba(30, 58, 95, 0.1);
        }

        .form-control-custom:focus+i,
        .input-wrapper:focus-within i {
            color: var(--primary-blue);
        }

        .form-control-custom.is-invalid {
            border-color: #ef4444;
        }

        .invalid-feedback {
            color: #ef4444;
            font-size: 0.75rem;
            margin-top: 0.25rem;
            display: block;
        }

        /* Indicador de seguridad de contraseña */
        .password-strength {
            margin-top: 0.5rem;
        }

        .strength-bar {
            height: 4px;
            background: #e2e8f0;
            border-radius: 2px;
            overflow: hidden;
            margin-bottom: 0.25rem;
        }

        .strength-bar-fill {
            height: 100%;
            width: 0%;
            transition: all 0.3s ease;
            border-radius: 2px;
        }

        .strength-bar-fill.weak {
            width: 25%;
            background: #ef4444;
        }

        .strength-bar-fill.fair {
            width: 50%;
            background: #f59e0b;
        }

        .strength-bar-fill.good {
            width: 75%;
            background: #3b82f6;
        }

        .strength-bar-fill.strong {
            width: 100%;
            background: #10b981;
        }

        .strength-text {
            font-size: 0.75rem;
            color: var(--gray-medium);
        }

        .strength-text.weak {
            color: #ef4444;
        }

        .strength-text.fair {
            color: #f59e0b;
        }

        .strength-text.good {
            color: #3b82f6;
        }

        .strength-text.strong {
            color: #10b981;
        }

        .terms-check {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            margin: 1.25rem 0;
        }

        .terms-check input[type="checkbox"] {
            width: 18px;
            height: 18px;
            accent-color: var(--primary-blue);
            cursor: pointer;
            margin-top: 2px;
            flex-shrink: 0;
        }

        .terms-check label {
            font-size: 0.85rem;
            color: var(--gray-dark);
            cursor: pointer;
            margin: 0;
            line-height: 1.5;
        }

        .terms-check a {
            color: var(--primary-blue);
            text-decoration: none;
            font-weight: 500;
        }

        .terms-check a:hover {
            text-decoration: underline;
        }

        .btn-register {
            width: 100%;
            padding: 1rem;
            font-size: 1rem;
            font-weight: 600;
            color: var(--white);
            background: linear-gradient(135deg, var(--accent-green) 0%, var(--accent-green-dark) 100%);
            border: none;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            font-family: 'Inter', sans-serif;
        }

        .btn-register:hover {
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(30, 58, 95, 0.3);
        }

        .btn-register:active {
            transform: translateY(0);
        }

        .divider {
            display: flex;
            align-items: center;
            margin: 1.25rem 0;
        }

        .divider::before,
        .divider::after {
            content: '';
            flex: 1;
            height: 1px;
            background: #e2e8f0;
        }

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

        .login-link {
            text-align: center;
            margin-top: 1rem;
        }

        .login-link p {
            color: var(--gray-dark);
            font-size: 0.95rem;
        }

        .login-link a {
            color: var(--primary-blue);
            font-weight: 600;
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .login-link a:hover {
            color: var(--accent-green);
            text-decoration: underline;
        }

        /* Animaciones */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .form-wrapper {
            animation: fadeInUp 0.6s ease-out;
        }

        /* Alert de errores */
        .alert-danger {
            background: #fef2f2;
            border: 1px solid #fecaca;
            color: #dc2626;
            padding: 1rem;
            border-radius: 10px;
            margin-bottom: 1rem;
            font-size: 0.85rem;
        }

        /* Toggle password visibility */
        .toggle-password {
            position: absolute;
            right: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray-medium);
            cursor: pointer;
            padding: 5px;
            transition: color 0.3s ease;
        }

        .toggle-password:hover {
            color: var(--primary-blue);
        }