/* ============================================================
   nav.css
   Lang-bar y navegación principal (sticky + mobile burger).
   ============================================================ */

/* ── Lang bar ── */
.lang-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-nav);
    background: var(--color-ocean-deep);
    height: var(--lang-bar-height);
    display: flex;
    align-items: center;
}

.lang-bar__inner {
    margin-left: auto;
    padding-right: var(--space-xl);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.lang-bar__link {
    font-size: var(--text-xs);
    font-weight: 500;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--color-aqua-light);
    opacity: 0.65;
    transition: opacity var(--transition-fast), color var(--transition-fast);
}
.lang-bar__link:hover,
.lang-bar__link.is-active {
    opacity: 1;
    color: var(--color-turquoise);
}

.lang-bar__sep {
    color: var(--color-ocean-bright);
    font-size: 10px;
    opacity: 0.5;
}

/* ── Nav principal ── */
.nav {
    position: fixed;
    top: var(--lang-bar-height);
    left: 0;
    right: 0;
    z-index: var(--z-nav);
    padding: 20px var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background var(--transition-normal),
                padding var(--transition-normal),
                box-shadow var(--transition-normal);
}

/* Estado scrolled: fondo sólido */
.nav.is-scrolled,
.nav.nav--solid {
    background: rgba(10, 42, 61, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 14px var(--space-xl);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.25);
}

/* ── Logo ── */
.nav__logo {
    font-family: var(--font-display);
    font-size: 26px;
    font-weight: 300;
    color: var(--color-white);
    letter-spacing: 2px;
    transition: opacity var(--transition-fast);
}
.nav__logo:hover { opacity: 0.85; }

.nav__logo-accent {
    color: var(--color-turquoise);
    font-style: italic;
}

/* ── Links desktop ── */
.nav__links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav__link {
    font-size: var(--text-xs);
    font-weight: 500;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.75);
    transition: color var(--transition-fast);
    position: relative;
}
.nav__link::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0; right: 0;
    height: 1px;
    background: var(--color-turquoise);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}
.nav__link:hover,
.nav__link.is-current {
    color: var(--color-white);
}
.nav__link:hover::after,
.nav__link.is-current::after {
    transform: scaleX(1);
}

/* CTA en nav */
.nav__link--cta {
    background: var(--color-turquoise);
    color: var(--color-ocean-deep) !important;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
}
.nav__link--cta::after { display: none; }
.nav__link--cta:hover {
    background: var(--color-aqua-light);
    color: var(--color-ocean-deep) !important;
    transform: translateY(-1px);
}

/* ── Hamburger (mobile) ── */
.nav__burger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    padding: 4px;
}

.nav__burger-bar {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-white);
    border-radius: 2px;
    transition: transform var(--transition-normal),
                opacity var(--transition-normal);
}

/* Estado abierto: X */
.nav__burger[aria-expanded="true"] .nav__burger-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav__burger[aria-expanded="true"] .nav__burger-bar:nth-child(2) {
    opacity: 0;
}
.nav__burger[aria-expanded="true"] .nav__burger-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ── Menú mobile ── */
.nav-mobile {
    position: fixed;
    top: calc(var(--lang-bar-height) + var(--nav-height));
    left: 0;
    right: 0;
    background: var(--color-ocean-deep);
    z-index: calc(var(--z-nav) - 1);
    padding: var(--space-md) var(--space-md);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal),
                transform var(--transition-normal);
    border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.nav-mobile.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
}

.nav-mobile__links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.nav-mobile__link {
    font-size: 15px;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.8);
    letter-spacing: 0.5px;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transition: color var(--transition-fast);
}
.nav-mobile__link:hover { color: var(--color-turquoise); }

.nav-mobile__link--cta {
    color: var(--color-turquoise) !important;
    font-weight: 600;
    border-bottom: none;
    margin-top: var(--space-xs);
}

/* ── Responsive ── */
@media (max-width: 900px) {
    .nav {
        padding: 16px 24px;
    }
    .nav.is-scrolled {
        padding: 12px 24px;
    }
    .nav__links {
        display: none;
    }
    .nav__burger {
        display: flex;
    }
    .lang-bar__inner {
        padding-right: 24px;
    }
}