body {
    background-color: #0d0d0d; /* Votre fond noir habituel */
    min-height: 100vh;
}


#header-travaux {
    padding: 80px 20px 40px 20px;
    text-align: center;
    background: radial-gradient(circle at top, #1a1a1a 0%, #0d0d0d 70%);
}

.sous-titre-travaux {
    font-family: 'Satoshi-Medium', sans-serif;
    color: #888;
    margin-top: 15px;
    text-transform: uppercase;
    letter-spacing: 2px;
}


.bouton-retour-flottant {
    position: fixed;
    top: 30px;
    left: 30px;
    background-color: rgba(218, 49, 90, 0.1); /* Votre rose très transparent */
    color: #f2f2f2;
    padding: 10px 20px;
    border: 1px solid #DA315A;
    border-radius: 30px;
    text-decoration: none;
    font-family: 'Satoshi-Bold', sans-serif;
    transition: all 0.3s ease;
    z-index: 100;
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    gap: 10px;
}

.bouton-retour-flottant:hover {
    background-color: #DA315A;
    transform: translateX(-5px);
    box-shadow: 0 0 15px rgba(218, 49, 90, 0.4);
}


.travaux-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px 80px 20px;
}


.semestre-section {
    margin-bottom: 80px;
    opacity: 0;
    animation: fadeIn 0.8s ease-out forwards;
}


.semestre-section:nth-child(1) { animation-delay: 0.1s; }
.semestre-section:nth-child(2) { animation-delay: 0.3s; }
.semestre-section:nth-child(3) { animation-delay: 0.5s; }

.titre-semestre {
    font-family: 'Satoshi-Black', sans-serif;
    font-size: 2em;
    color: #f2f2f2;
    margin-bottom: 30px;
    border-left: 4px solid #DA315A; 
    padding-left: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.badge {
    background-color: #1a1a1a;
    color: #DA315A;
    font-size: 0.5em;
    padding: 5px 10px;
    border-radius: 5px;
    font-family: 'Satoshi-Bold';
    vertical-align: middle;
    border: 1px solid rgba(218, 49, 90, 0.3);
}


.grid-travaux {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}


.card-travail {
    background-color: #161616;
    border: 1px solid #2a2a2a;
    border-radius: 12px;
    padding: 25px;
    text-decoration: none;
    color: #f2f2f2;
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 140px;
}


.seq-num {
    position: absolute;
    top: -15px;
    right: -10px;
    font-family: 'Satoshi-Black';
    font-size: 5em;
    color: rgba(255, 255, 255, 0.03);
    transition: color 0.3s;
    z-index: 0;
}

.card-content {
    z-index: 1;
}

.card-content h3 {
    margin: 0 0 5px 0;
    font-family: 'Satoshi-Bold';
    font-size: 1.4em;
    color: #f2f2f2;
}

.card-content p {
    margin: 0;
    font-family: 'Satoshi-Medium';
    font-size: 0.9em;
    color: #888;
}

.arrow {
    align-self: flex-end;
    font-size: 1.5em;
    color: #DA315A;
    transform: translateX(0);
    transition: transform 0.3s;
}

.card-travail:hover {
    transform: translateY(-5px);
    border-color: #DA315A;
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
}

.card-travail:hover .seq-num {
    color: rgba(218, 49, 90, 0.1);
}

.card-travail:hover .arrow {
    transform: translateX(10px);
}

.card-travail:hover h3 {
    color: #DA315A;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@media screen and (max-width: 600px) {
    .titre-semestre {
        font-size: 1.5em;
    }
    .grid-travaux {
        grid-template-columns: 1fr; 
    }
    .card-travail {
        height: auto; 
    }
    .bouton-retour-flottant span {
        display: none; 
    }
    .bouton-retour-flottant {
        padding: 10px;
        border-radius: 50%; 
        width: 40px;
        height: 40px;
        justify-content: center;
        left: 20px;
    }
    .bouton-retour-flottant::after {
        content: "←";
        font-size: 1.2em;
    }
    .bouton-retour-flottant {
        font-size: 0; 
    }
    .bouton-retour-flottant::after {
        font-size: 20px;
    }
}