body {
    background-color: #090909;
    color: #f5f5f5;
}

header {
    background: rgba(9, 9, 9, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid #222;
    z-index: 1000;
}

#presentation {
    max-width: 1100px;
    margin: auto;
}

#presentation h1 {
    max-width: 950px;
}

section {
    padding: 100px 0;
}

.card {
    background: #111 !important;
    border-color: #2b2b2b !important;
    border-radius: 16px;
    transition: transform 0.25s ease,
                border-color 0.25s ease,
                box-shadow 0.25s ease;
}

.card:hover {
    transform: translateY(-6px);
    border-color: #666 !important;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.35);
}

:root {
    --accent: #b8a7ff;
}

.text-uppercase.small {
    color: var(--accent) !important;
    letter-spacing: 0.15em;
}

.navbar-brand {
    color: var(--accent) !important;
}

#presentation h1 {
    max-width: 950px;
}

.btn {
    border-radius: 10px;
    font-weight: 500;
    padding: 12px 22px;
    transition: all 0.2s ease;
}

.btn-light:hover {
    transform: translateY(-2px);
}

.btn-outline-light:hover {
    transform: translateY(-2px);
}

section {
    padding: 110px 0;
}

#presentation {
    padding-top: 40px;
}

#presentation h1 {
    font-size: clamp(3.5rem, 8vw, 7rem);
    line-height: 0.95;
    letter-spacing: -0.04em;
}

#presentation .lead {
    max-width: 760px;
}

@media (max-width: 768px) {

    section {
        padding: 75px 0;
    }

    #presentation {
        min-height: 85vh !important;
    }

    #presentation h1 {
        font-size: clamp(3rem, 14vw, 5rem);
    }

    #presentation .lead {
        font-size: 1.05rem;
    }

    .display-4 {
        font-size: 2.5rem;
    }

    .card-body {
        padding: 24px !important;
    }

    .navbar-collapse {
        padding-top: 20px;
    }
}