/*
 * site-chrome.css - estilos de la BARRA DE NAVEGACIÓN GLOBAL (nivel 1).
 * Pareja de static/js/site-chrome.js, que inyecta el markup .main-nav en todas las
 * páginas. Extraído de static/styles.css el 2026-10-13 para que las páginas que no
 * cargan styles.css (404, privacidad, maestrías, cursos/ia-*) tengan la misma barra.
 * El carril de secciones (nivel 2) y la barra de progreso están en site-nav.css;
 * el menú móvil, en mobile-menu.css.
 */
@import url("design-system.css");

/* nav */
.main-nav {
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border-light);
    position: sticky;
    top: var(--banner-height);
    z-index: 999;
}

/* Light mode - nav tipo "glass" con sombra sutil (look diseñado) */
body.light-mode .main-nav {
    background: rgba(255, 255, 255, 0.82);
    border-bottom: 1px solid rgba(15, 23, 42, 0.07);
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 12px 30px rgba(15, 23, 42, 0.06);
}

@media (prefers-color-scheme: light) {
    body:not(.dark-mode):not(.light-mode) .main-nav {
        background: rgba(255, 255, 255, 0.82);
        border-bottom: 1px solid rgba(15, 23, 42, 0.07);
        box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 12px 30px rgba(15, 23, 42, 0.06);
    }
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 16px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.logo {
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: 20px;
    font-weight: 700;
}

.logo {
    display: block;
    position: relative;
    height: 34px;
    width: 132px;
}

.logo img {
    height: 34px;
    width: auto;
    display: block;
    transition: opacity 0.3s ease;
}

.logo-dark,
.logo-light {
    position: absolute;
    top: 0;
    left: 0;
}

/* Default (dark mode) - show white logo */
.logo-dark {
    opacity: 1;
}

.logo-light {
    opacity: 0;
}

/* Light mode - show color logo */
body.light-mode .logo-dark {
    opacity: 0;
}

body.light-mode .logo-light {
    opacity: 1;
}

.nav-center {
    display: flex;
    gap: 32px;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-accent);
}

.nav-right {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-shrink: 0;
}

.nav-btn-secondary {
    padding: 8px 16px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: 14px;
    transition: all var(--transition-fast);
}

.nav-btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.nav-btn-primary {
    padding: 8px 16px;
    background: var(--color-accent);
    border: 1px solid var(--color-accent);
    border-radius: 6px;
    color: #ffffff;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.nav-btn-primary:hover {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

@media (max-width: 768px) {
    /* Nav en tablet */
    .nav-container {
        padding: 14px 24px;
    }
    .nav-btn-secondary,
    .nav-btn-primary {
        padding: 10px 16px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 12px 16px;
    }
    .nav-left {
        min-width: 0;
    }
    .logo img {
        height: 28px;
        max-width: 100%;
    }
    .logo {
        width: 110px;
        height: 28px;
    }
    /* Botones del nav más pequeños */
    .nav-btn-secondary,
    .nav-btn-primary {
        padding: 8px 12px;
        font-size: 13px;
    }
    .nav-right {
        gap: 8px;
    }
    .nav-btn-secondary,
    .nav-btn-primary {
        white-space: nowrap;
    }
}

/* Preferencia del sistema en claro (sin clase en body): logo a color */
/* System preference light mode */
@media (prefers-color-scheme: light) {
    body:not(.dark-mode):not(.light-mode) .logo-dark {
        opacity: 0;
    }

    body:not(.dark-mode):not(.light-mode) .logo-light {
        opacity: 1;
    }
}