create a professional timeline infographic ne modifie pas le texte 12 mois et 9 mois the focal point is a sleek horizontal arrow symbolizing progress use a gradient of vibrant green for the arrow transitioning from a lighter shade at the start to a darker green at the tip indicating forward movement place circular nodes on the arrow at key intervals filled with a solid blue hue representing significant milestones use a modern sans serif font for annotations ensuring readability main titles like etudes de conception and suivit des travaux should be bold and in navy blue conveying importance subtitles and descriptions such as ordre de service de d marrage de mission de moe are in black for clear distinction add arrow connectors from each milestone to their description in a soft blue maintaining consistency the background is a subtle off white promoting a clean and professional atmosphere
