:root {
            --primary-color: #003366;
            --secondary-color: #0056b3;
            --accent-color: #0b5ed7;
            --light-color: #f0f7ff;
            --dark-color: #0a2540;
            --success-color: #198754;
            --danger-color: #dc3545;
        }

        body {
            font-family: 'Poppins', sans-serif;
            background-color: #f8f9fa;
            color: #212529;
        }

        .main-header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 1.5rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }

        .logo {
            font-weight: 700;
            font-size: 1.8rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .card {
            border: none;
            border-radius: 1rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
        }

        .card-header {
            background-color: var(--light-color);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
            border-radius: 1rem 1rem 0 0 !important;
            padding: 1.25rem;
        }

        h1 {
            color: var(--primary-color);
            font-weight: 600;
        }

        h2 {
            font-size: 1.4rem; /* Ajustado para subtítulos dentro de las tarjetas */
            font-weight: 500;
            color: var(--primary-color);
        }
        
        /* Estilo para encabezados de sección principales */
        .section-title {
            font-size: 2rem;
            font-weight: 600;
            color: var(--dark-color);
            margin-bottom: 1.5rem;
            text-align: center;
        }
        .section-subtitle {
            font-size: 1.5rem;
            font-weight: 500;
            color: var(--primary-color);
            margin-top: 1.5rem;
            margin-bottom: 1rem;
        }


        textarea {
            font-family: 'Fira Code', 'Courier New', monospace;
            font-size: 0.9rem;
            border-radius: 0.5rem;
            resize: vertical;
            min-height: 280px;
            padding: 1rem;
            border: 1px solid #ced4da;
            transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
            background-color: #f8f9fa;
        }

        textarea:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
            background-color: white;
        }

        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.6rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 500;
            transition: all 0.2s ease;
        }

        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-2px);
        }

        .btn-secondary {
            background-color: #6c757d;
            border-color: #6c757d;
            padding: 0.6rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 500;
            transition: all 0.2s ease;
        }

        .btn-secondary:hover {
            background-color: #5a6268;
            border-color: #5a6268;
            transform: translateY(-2px);
        }

        .btn-dark {
            background-color: #212529;
            border-color: #212529;
            padding: 0.6rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 500;
            transition: all 0.2s ease;
        }

        .btn-dark:hover {
            background-color: #1c1f23;
            border-color: #1c1f23;
            transform: translateY(-2px);
        }

        .format-btn {
            padding: 0.4rem 1rem;
            border-radius: 0.5rem;
            font-size: 0.9rem;
            transition: all 0.2s ease;
        }

        .format-btn.active {
            background-color: var(--primary-color);
            color: white;
        }

        .feature-card {
            height: 100%;
            border-radius: 1rem;
            padding: 2rem 1.5rem;
            text-align: center;
            border: none;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            background-color: white; /* Añadido para consistencia */
        }

        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
        }

        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background-color: var(--light-color);
        }

        .custom-file-upload {
            cursor: pointer;
            display: inline-block;
            padding: 0.5rem 1rem;
            background-color: #f8f9fa;
            border: 1px solid #ced4da;
            border-radius: 0.5rem;
            transition: all 0.2s ease;
        }

        .custom-file-upload:hover {
            background-color: #e9ecef;
        }

        .spinner-border {
            display: none;
            width: 1.5rem;
            height: 1.5rem;
        }

        .alert {
            display: none;
            animation: fadeIn 0.3s ease-in-out;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        #info-converter h3 {
            font-size: 1.25rem;
            color: var(--accent-color);
            font-weight: 500;
            margin-top: 1.2rem;
            margin-bottom: 0.7rem;
        }
        #info-converter p, #info-converter ul {
            color: #495057;
            line-height: 1.7;
        }
        #info-converter ul {
            padding-left: 1.5rem;
        }
        #info-converter ul li {
            margin-bottom: 0.5rem;
        }