/* Reset y estilos base */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
        }
        
        /* Contenedor principal */
        .convocatorias-section {
            width: 100%;
            background-color: white;
            padding: 80px 20px;
        }
        
        /* Título de la sección */
        .section-title {
            text-align: center;
            margin-bottom: 60px;
            position: relative;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            color: #2c3e50;
            margin-bottom: 15px;
            font-weight: 700;
        }
        
        .section-title::after {
            content: '';
            display: block;
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, #3498db, #2ecc71);
            margin: 0 auto;
            border-radius: 2px;
        }
        
        /* Contenedor de las tarjetas */
        .convocatorias-container {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
        }
        
        /* Tarjetas individuales */
        .convocatoria-card {
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        
        .convocatoria-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
        }
        
        /* Icono de PDF */
        .pdf-icon {
            background: linear-gradient(135deg, #3498db, #2980b9);
            height: 120px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }
        
        .pdf-icon::before {
            content: '';
            width: 60px;
            height: 80px;
            background-color: white;
            border-radius: 4px;
            position: relative;
            z-index: 1;
        }
        
        .pdf-icon::after {
            content: 'PDF';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: #3498db;
            font-weight: bold;
            font-size: 1.2rem;
            z-index: 2;
        }
        
        /* Contenido de la tarjeta */
        .card-content {
            padding: 25px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        
        .card-content h3 {
            font-size: 1.3rem;
            color: #2c3e50;
            margin-bottom: 15px;
            line-height: 1.4;
        }
        
        .fecha-cierre {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
            color: #7f8c8d;
            font-size: 0.9rem;
        }
        
        .fecha-cierre i {
            margin-right: 8px;
            color: #e74c3c;
        }
        
        /* Botón de descarga */
        .btn-descargar {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(90deg, #2ecc71, #27ae60);
            color: white;
            padding: 12px 20px;
            border-radius: 6px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
            margin-top: auto;
            border: none;
            cursor: pointer;
        }
        
        .btn-descargar:hover {
            background: linear-gradient(90deg, #27ae60, #219653);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(46, 204, 113, 0.3);
        }
        
        .btn-descargar i {
            margin-right: 8px;
        }
        
        /* Responsive */
        @media (max-width: 1024px) {
            .convocatorias-container {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        @media (max-width: 768px) {
            .convocatorias-container {
                grid-template-columns: 1fr;
                max-width: 500px;
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
        }