header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15,15,15,0.95);
    padding: 1rem 2rem; /* <-- espace à gauche et à droite */
    display: flex;
    justify-content: space-between; /* logo à gauche, nav à droite */
    align-items: center;
    z-index: 100;
    box-sizing: border-box;
}

header .logo {
    font-weight: bold;
    font-size: 1.5rem;
    color: #fff;
}

header nav {
    display: flex;
    gap: 1.5rem; /* espace entre les liens */
}

header nav a {
    color: #eee;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

header nav a:hover {
    color: #ff3c3c;
}

/* Responsive mobile */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: flex-start;
    }
    header nav {
        flex-wrap: wrap;
        gap: 1rem;
        margin-top: 0.5rem;
    }
}