.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    border-bottom: 1px solid transparent;
    transition: background var(--transition-slow), border-color var(--transition-slow), box-shadow var(--transition-slow);
}

.nav--scrolled {
    background: var(--color-white);
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-nav);
}

.nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

/* Logo swap */
.nav__logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.nav__logo-black {
    display: none;
}

.nav--scrolled .nav__logo-white {
    display: none;
}

.nav--scrolled .nav__logo-black {
    display: block;
}

/* Nav links */
.nav__links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav__links a {
    color: rgba(255, 255, 255, 0.85);
    font-size: 15px;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

.nav__links a:hover {
    color: var(--color-white);
}

.nav--scrolled .nav__links a {
    color: var(--color-text);
}

.nav--scrolled .nav__links a:hover {
    color: var(--color-primary);
}

/* Actions */
.nav__actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav__login {
    color: rgba(255, 255, 255, 0.85);
    font-size: 15px;
    font-weight: var(--font-weight-medium);
}

.nav__login:hover {
    color: var(--color-white);
}

.nav--scrolled .nav__login {
    color: var(--color-text);
}

.nav--scrolled .nav__login:hover {
    color: var(--color-primary);
}

/* Hamburger */
.nav__hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav__hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-white);
    border-radius: 1px;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav--scrolled .nav__hamburger span {
    background: var(--color-navy);
}

.nav__hamburger.is-active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav__hamburger.is-active span:nth-child(2) {
    opacity: 0;
}

.nav__hamburger.is-active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile overlay */
.nav__mobile-overlay {
    display: none;
    position: fixed;
    inset: 0;
    top: 72px;
    background: var(--color-white);
    padding: 32px var(--container-padding);
    flex-direction: column;
    gap: 24px;
    z-index: 999;
}

.nav__mobile-overlay.is-open {
    display: flex;
}

.nav__mobile-links {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.nav__mobile-links a {
    display: block;
    padding: 16px 0;
    font-size: 18px;
    font-weight: var(--font-weight-medium);
    color: var(--color-navy);
    border-bottom: 1px solid var(--color-border);
}

.nav__mobile-links a:hover {
    color: var(--color-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .nav__links,
    .nav__actions {
        display: none;
    }

    .nav__hamburger {
        display: flex;
    }
}