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

body{
    font-family:Arial, sans-serif;
    background:#f4f6f9;
    color:#222;
}

/* HEADER */
header{
    background:linear-gradient(135deg, #003b70, #0066b3);
    color:white;
    text-align:center;
    padding:30px 20px;
}

header h1{
    font-size:50px;
    margin-bottom:10px;
}

header p{
    font-size:18px;
}

/* MENU */
nav{
    background:#0059a8;
    text-align:center;
    padding:16px;
}

nav a{
    color:white;
    text-decoration:none;
    font-weight:bold;
    margin:0 18px;
    font-size:17px;
}

nav a:hover{
    color:#ffd700;
}

/* ACCUEIL */
.accueil{
    background:#eef2f7;
    padding:45px 20px;
    text-align:center;
}

.accueil h2{
    color:#003b70;
    font-size:36px;
    margin-bottom:15px;
}

.accueil p{
    font-size:18px;
    color:#444;
    margin-bottom:25px;
}

.btn{
    background:#003b70;
    color:white;
    padding:14px 25px;
    border-radius:8px;
    text-decoration:none;
    display:inline-block;
    font-weight:bold;
}

/* PRESENTATION */
.presentation{
    padding:50px 20px;
    text-align:center;
    background:#f4f6f9;
}

.presentation h2{
    color:#003b70;
    font-size:34px;
    margin-bottom:35px;
}

.infos-container{
    display:grid;
    grid-template-columns:repeat(3, 1fr);
    gap:30px;
    max-width:1200px;
    margin:auto;
}

.info-box{
    background:white;
    padding:35px;
    border-radius:15px;
    box-shadow:0 5px 15px rgba(0,0,0,0.1);
}

.info-box h3{
    color:#003b70;
    margin-bottom:18px;
    font-size:22px;
}

.info-box p{
    color:#444;
    line-height:1.6;
    font-size:16px;
}

/* FOOTER */
footer{
    background:#003b70;
    color:white;
    text-align:center;
    padding:20px;
    font-size:14px;
}

.admin-link{
    color:white;
    font-size:12px;
    text-decoration:none;
    opacity:0.6;
}

.admin-link:hover{
    opacity:1;
}

/* RESPONSIVE */
@media screen and (max-width:900px){

    header h1{
        font-size:36px;
    }

    nav a{
        display:block;
        margin:12px 0;
    }

    .infos-container{
        grid-template-columns:1fr;
    }

    .accueil h2,
    .presentation h2{
        font-size:28px;
    }
}

.card-container{
    display:grid;
    grid-template-columns:repeat(3, 1fr);
    gap:30px;
    padding:30px;
}

.card{
    background:white;
    padding:30px;
    border-radius:15px;
    box-shadow:0 5px 15px rgba(0,0,0,0.1);
}

.card h3{
    color:#003b70;
    font-size:26px;
    margin-bottom:15px;
}

.card p{
    line-height:1.6;
    margin-bottom:20px;
}

@media screen and (max-width:900px){
    .card-container{
        grid-template-columns:1fr;
    }
}
.plateformes {
    padding: 60px 20px;
    text-align: center;
    background: #f4f6f9;
}

.plateformes h2 {
    color: #003b70;
    margin-bottom: 15px;
}

.plateformes p {
    margin-bottom: 30px;
}

.bande-info {
    background: #ffcc00;
    color: #000;
    padding: 12px;
    font-weight: bold;
    font-size: 16px;
    border-bottom: 2px solid #e0b000;
}

.bande-info marquee {
    width: 100%;
}