/* Header: transparente sobre el hero, se convierte en panel de vidrio
   navy al hacer scroll (clase .is-scrolled aplicada por nav.js). */

.site-header {
    position: fixed;
    inset-inline: 0;
    top: 0;
    z-index: var(--z-header);
    padding-block: var(--space-3);
    transition: padding var(--duration-base) var(--ease-premium),
                background var(--duration-base) var(--ease-premium),
                border-color var(--duration-base) var(--ease-premium),
                box-shadow var(--duration-base) var(--ease-premium);
    border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
    padding-block: var(--space-1);
    background: var(--surface-glass-strong);
    backdrop-filter: blur(16px) saturate(140%);
    -webkit-backdrop-filter: blur(16px) saturate(140%);
    border-bottom-color: var(--surface-glass-border);
    box-shadow: var(--shadow-sm);
}

.site-header__bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
}

/* --- Navegación principal --- */

.site-nav {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.site-nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.site-nav__links a {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    position: relative;
    padding-block: 0.3rem;
    transition: color var(--duration-fast) var(--ease-premium);
}

.site-nav__links a::after {
    content: '';
    position: absolute;
    left: 0;
    right: 100%;
    bottom: 0;
    height: 1px;
    background: var(--gradient-gold);
    transition: right var(--duration-base) var(--ease-premium);
}

.site-nav__links a:hover {
    color: var(--c-ivory);
}

.site-nav__links a:hover::after {
    right: 0;
}

.site-header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* --- Toggle móvil --- */

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
}

.nav-toggle span {
    width: 20px;
    height: 1.5px;
    background: var(--c-ivory);
    transition: transform var(--duration-fast) var(--ease-premium),
                opacity var(--duration-fast) var(--ease-premium);
}

.nav-toggle.is-active span:nth-child(1) {
    transform: translateY(6.5px) rotate(45deg);
}

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

.nav-toggle.is-active span:nth-child(3) {
    transform: translateY(-6.5px) rotate(-45deg);
}

@media (max-width: 900px) {
    .site-nav__links {
        position: fixed;
        inset: 0 0 0 auto;
        top: 0;
        height: 100vh;
        width: min(320px, 82vw);
        flex-direction: column;
        justify-content: center;
        align-items: flex-start;
        gap: var(--space-4);
        padding: var(--space-5);
        background: var(--surface-glass-strong);
        backdrop-filter: blur(20px) saturate(140%);
        -webkit-backdrop-filter: blur(20px) saturate(140%);
        border-left: 1px solid var(--surface-glass-border);
        transform: translateX(100%);
        transition: transform var(--duration-base) var(--ease-premium);
    }

    .site-nav__links.is-open {
        transform: translateX(0);
    }

    .site-nav__links a {
        font-size: 1rem;
    }

    .nav-toggle {
        display: flex;
    }
}