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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: #f7f6f6;
            min-height: 100vh;
            padding: 20px;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .container {
            max-width: 500px;
            width: 100%;
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            overflow: hidden;
        }

        .header {
            background: white;
            color: white;
            padding: 40px 30px;
            text-align: center;
        }

        .header h1 {
            font-size: 2rem;
            margin-bottom: 10px;
        }

        .header p {
            opacity: 0.9;
            font-size: 1rem;
        }

        .content {
            padding: 40px 30px;
        }

        .login-form {
            display: none;
        }

        .form-group {
            margin-bottom: 25px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #495057;
            font-size: 0.95rem;
        }

        .form-group input {
            width: 100%;
            padding: 14px;
            border: 2px solid #e9ecef;
            border-radius: 10px;
            font-size: 1rem;
            transition: border-color 0.3s;
        }

        .form-group input:focus {
            outline: none;
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }

        .form-group input.error {
            border-color: #dc3545;
        }

        .error-message {
            color: #dc3545;
            font-size: 0.85rem;
            margin-top: 5px;
            display: none;
        }

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

        .login-btn {
            width: 100%;
            padding: 14px;
            background: #b89f6e;
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .login-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }

        .login-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        .loading {
            text-align: center;
            padding: 40px 20px;
        }

        .loading p {
            font-size: 1.1rem;
            color: #6c757d;
            margin-bottom: 15px;
        }

        .spinner {
            border: 4px solid #f3f3f3;
            border-top: 4px solid #667eea;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
            margin: 0 auto;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        /* Estilo para el modal de error */
        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0,0,0,0.4);
        }

        .modal-content {
            background-color: #fff;
            margin: 15% auto;
            padding: 30px;
            border-radius: 15px;
            width: 80%;
            max-width: 500px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
            transform: translateY(0);
            transition: transform 0.3s ease;
        }

        .modal-content.show {
            transform: translateY(-10px);
        }

        .close {
            color: #aaa;
            float: right;
            font-size: 28px;
            font-weight: bold;
            cursor: pointer;
            margin-top: -10px;
        }

        .close:hover,
        .close:focus {
            color: #000;
            text-decoration: none;
        }

        .modal h2 {
            color: #dc3545;
            margin-bottom: 15px;
            text-align: center;
        }

        .modal p {
            text-align: center;
            margin-bottom: 25px;
            font-size: 1.1rem;
            line-height: 1.5;
        }

        .modal-btn {
            width: 100%;
            padding: 12px;
            background: #b89f6e;
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
            margin-top: 10px;
        }

        .modal-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }