/* Header & Navigation */
.header {
    background: var(--card);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 2rem;
}

.nav__logo img {
    height: 40px;
}

.nav__list {
    list-style: none;
    display: flex;
    gap: 30px;
}

.nav__link {
    text-decoration: none;
    color: var(--foreground);
    font-weight: 700;
    position: relative;
    transition: color var(--transition-speed) ease;
}

.nav__link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 3px;
    bottom: -5px;
    left: 50%;
    background-color: var(--primary);
    transition: all var(--transition-speed) ease-in-out;
}

.nav__link:hover, .nav__link.active {
    color: var(--primary);
}

.nav__link:hover::after, .nav__link.active::after {
    width: 100%;
    left: 0;
}

.nav__controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.lang-switcher {
    display: flex;
    align-items: center;
    color: var(--border);
}

.lang-switcher__btn {
    background: none;
    border: none;
    cursor: pointer;
    font-weight: bold;
    color: var(--muted-foreground);
    transition: color var(--transition-speed) ease;
}

.lang-switcher__btn--active,
.lang-switcher__btn:hover {
    color: var(--foreground);
}

.nav__hamburger {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
}
.nav__hamburger span {
    display: block;
    width: 25px;
    height: 2px;
    margin: 6px 0;
    background: var(--foreground);
    transition: all var(--transition-speed) ease;
}

@media (max-width: 992px) {
    .nav { padding: 0 1rem; }
    .nav__list {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--card);
        flex-direction: column;
        text-align: center;
        border-bottom: 1px solid var(--border);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.5s ease-in-out;
    }
    .nav__list.active {
        display: flex;
        max-height: 500px;
    }
    .nav__item { margin: 0; }
    .nav__link { display: block; padding: 1.5rem; border-bottom: 1px solid var(--border); }
    .nav__link:hover::after, .nav__link.active::after { display: none; }
    .nav__hamburger { display: block; }
    .nav__hamburger.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .nav__hamburger.active span:nth-child(2) { opacity: 0; }
    .nav__hamburger.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
}