/* ===== HEADER ===== */

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: 1rem 0;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.navbar {
    max-width: 50%;
    background-color: rgba(0, 0, 0, 0.781);
    backdrop-filter: blur(10px);
    border-radius: 10px;
    margin: 0 auto;
    padding: 0.8rem 2rem;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    transform-origin: center;
}

.nav-links {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 3rem;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    position: relative;
    transition: all 0.3s ease;
    font-size: 1.1rem;
}

.nav-links a::after {
    content: '';
    display: block;
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 100%;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.35s cubic-bezier(0.77, 0, 0.18, 1);
}

.nav-links a:hover::after,
.nav-links a:focus::after {
    transform: scaleX(1);
    transform-origin: right;
}

/* Classe pour le header réduit */
header.scrolled {
    padding: 0.5rem 0;
}

header.scrolled .navbar {
    max-width: 50%;
    padding: 0.5rem 1.5rem;
    transform: scale(0.95);
}

header.scrolled .nav-links {
    gap: 2rem;
}

header.scrolled .nav-links a {
    font-size: 1rem;
}