/* ==================== NAVIGATION — la barre de dossier ==================== */

.navbar {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 1000;
    background: color-mix(in srgb, var(--paper) 82%, transparent);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid transparent;
    transition: border-color .25s ease, background .25s ease;
}

.navbar.scrolled {
    background: color-mix(in srgb, var(--paper) 94%, transparent);
    border-bottom-color: var(--line);
}

.nav-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--gutter);
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.logo-text {
    font-family: var(--f-display);
    font-size: 1.22rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--ink);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: .35rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-link {
    display: inline-block;
    font-family: var(--f-body);
    font-size: .89rem;
    font-weight: 550;
    color: var(--ink-2);
    padding: .45rem .8rem;
    border-radius: 999px;
    transition: color .18s ease, background .18s ease;
}

.nav-link:hover {
    color: var(--ink);
    background: var(--paper-2);
}

.nav-link.active {
    color: var(--green);
    background: var(--green-soft);
}

/* Fil de lecture — liseré bronze sous la barre */
.nav-progress {
    position: absolute;
    left: 0;
    bottom: -1px;
    height: 2px;
    width: 0;
    background: var(--bronze);
    transition: width .1s linear;
}

/* --- Hamburger ------------------------------------------------------------ */
.nav-actions { display: flex; align-items: center; }

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: .6rem .4rem;
    cursor: pointer;
}

.hamburger span {
    width: 22px;
    height: 2px;
    background: var(--ink);
    border-radius: 2px;
    transition: transform .25s ease, opacity .2s ease;
}

.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 900px) {
    .hamburger { display: flex; }

    .nav-menu {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: .2rem;
        background: var(--paper);
        border-bottom: 1px solid var(--line);
        box-shadow: var(--shadow-lift);
        padding: 1rem var(--gutter) 1.4rem;
        transform: translateY(-8px);
        opacity: 0;
        visibility: hidden;
        transition: opacity .22s ease, transform .22s ease, visibility .22s;
    }

    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: none;
    }

    .nav-link { padding: .7rem .9rem; font-size: 1rem; }
}