/* ========================================
   NAV.CSS — Header y Navegación
   ======================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-nav);
    padding: 1rem 0;
    transition: background var(--transition-base),
                padding var(--transition-base),
                box-shadow var(--transition-base);
}

/* Estado transparente (sobre hero) */
.site-header:not(.is-scrolled) {
    background: transparent;
}

/* Estado sólido al hacer scroll */
.site-header.is-scrolled {
    background: rgba(26, 26, 20, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 0.6rem 0;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

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

/* Logo */
.nav__logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    z-index: calc(var(--z-nav) + 2);
}

.nav__logo-svg {
    height: 40px;
    width: auto;
    transition: transform var(--transition-base);
}

.nav__logo:hover .nav__logo-svg {
    transform: scale(1.05);
}

.nav__logo-text {
    font-family: var(--font-subtitulo);
    font-size: 0.85rem;
    color: var(--color-crema);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    line-height: 1.2;
}

.nav__logo-text span {
    display: block;
    color: var(--color-ocre);
    font-family: var(--font-titulo);
    font-size: 1rem;
}

/* Desktop nav links */
.nav__links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav__link {
    position: relative;
    padding: 0.5rem 1rem;
    font-family: var(--font-cuerpo);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-crema);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    text-decoration: none;
    transition: color var(--transition-fast);
    white-space: nowrap;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 70%;
    height: 2px;
    background: var(--color-ocre);
    border-radius: 1px;
    transition: transform var(--transition-base);
    transform-origin: center;
}

.nav__link:hover {
    color: var(--color-ocre);
}

.nav__link:hover::after,
.nav__link.is-active::after {
    transform: translateX(-50%) scaleX(1);
}

.nav__link.is-active {
    color: var(--color-ocre);
}

/* Hamburger */
.nav__hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    cursor: pointer;
    z-index: calc(var(--z-nav) + 2);
    background: none;
    border: none;
    padding: 0;
}

.nav__hamburger-line {
    display: block;
    width: 26px;
    height: 2px;
    background: var(--color-crema);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.nav__hamburger-line + .nav__hamburger-line {
    margin-top: 6px;
}

/* Hamburger → X animation */
.nav__hamburger.is-open .nav__hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.nav__hamburger.is-open .nav__hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.nav__hamburger.is-open .nav__hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ── Mobile nav ── */
@media (max-width: 900px) {
    .nav__hamburger {
        display: flex;
    }

    .nav__links {
        position: fixed;
        inset: 0;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
        background: rgba(26, 26, 20, 0.97);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: opacity var(--transition-base),
                    visibility var(--transition-base),
                    transform var(--transition-base);
        z-index: calc(var(--z-nav) + 1);
    }

    .nav__links.is-open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav__link {
        font-size: 1.1rem;
        padding: 0.75rem 2rem;
    }

    .nav__link::after {
        bottom: 0.4rem;
    }
}

/* ── Large desktop ── */
@media (min-width: 1400px) {
    .nav__link {
        padding: 0.5rem 1.25rem;
        font-size: 0.85rem;
    }
}