#home {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 70px; /* hauteur approximative de la navbar */
}

#home::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.2); /* overlay sombre */
    z-index: 1;
}

#home .container-fluid {
    position: relative;
    z-index: 2;
}

/* Makes the links visually clear and interactive */
.link-hover {
    color: #0d6efd; /* Bootstrap primary color */
    text-decoration: none;
    transition: color 0.2s, transform 0.2s;
}

.link-hover:hover {
    color: #0a58ca; /* darker blue on hover */
    text-decoration: underline;
    transform: translateY(-2px);
}

.title-underline { /* for the underline style of title */
    position: relative;
    display: inline-block;
    font-weight: bold;
    margin-bottom: 1rem;
}

.title-underline::after {
    content: "";
    display: block;
    width: 60px; /* width of the underline */
    height: 3px; /* height */
    background-color: #0d6efd; /* bleu bootstrap */
    border-radius: 2px;
    margin: 0.5rem auto 0;
}

/* The scroll button of the hero section */
.btn-scroll {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: linear-gradient(135deg, #0d6efd, #3b82f6);
    color: #fff;
    font-weight: 600;
    text-decoration: none;
    border-radius: 30px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.3);
}

.btn-scroll i {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.btn-scroll:hover {
    background: linear-gradient(135deg, #0b5ed7, #2563eb);
    box-shadow: 0 6px 16px rgba(13, 110, 253, 0.4);
    transform: translateY(-2px);
}

.btn-scroll:hover i {
    transform: translateY(4px);
}