/* ==========================================================
   Full Professor — header.css
   Skip link · Site header · Topbar · Masthead · Navegação
   ========================================================== */

/* --- Skip link ------------------------------------------- */
.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    z-index: 999999;
    padding: 0.5rem 1.25rem;
    background: var(--fp-accent);
    color: #fff;
    font-size: 0.875rem;
    font-weight: 700;
    border-radius: 6px;
    text-decoration: none;
    transition: top var(--fp-transition);
}

.skip-link:focus {
    top: 1rem;
    outline: none;
    box-shadow: var(--fp-focus-ring);
}

/* --- Site header ----------------------------------------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--fp-surface);
    border-bottom: 0.5px solid var(--fp-border);
}

/* --- Topbar (barra de utilidade) -------------------------- */
.topbar {
    background: var(--fp-ink);
    border-bottom: 0.5px solid var(--fp-ink);
    font-size: 0.6875rem;
}

.topbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 34px;
    max-width: 1280px;
    margin-inline: auto;
    padding-inline: 1.5rem;
    gap: 1rem;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.7);
    overflow: hidden;
}

.topbar-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--fp-accent);
    flex-shrink: 0;
}

.topbar-sep {
    color: rgba(255, 255, 255, 0.25);
}

.topbar-tagline {
    font-size: 0.625rem;
    font-weight: 500;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.7);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

/* --- Barra de acessibilidade ----------------------------- */
.a11y-toolbar {
    display: flex;
    gap: 0.25rem;
    padding-right: 0.75rem;
    border-right: 0.5px solid rgba(255, 255, 255, 0.2);
}

/* Especificidade ".a11y-toolbar .toggle-btn" (em vez de só ".a11y-btn")
   de propósito: os botões da topbar carregam as classes "a11y-btn
   toggle-btn" juntas (a segunda é o que o main.js usa pra ligar o clique
   e sincronizar com os toggles da sidebar) — e o ".toggle-btn" sozinho,
   definido em sidebar.css (switch estilo iOS, carregado depois de
   header.css na cadeia de enqueue), vencia o empate de especificidade e
   sobrescrevia o tamanho/formato do botão aqui. */
.a11y-toolbar .toggle-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    padding: 0;
    background: transparent;
    border: 0.5px solid rgba(255, 255, 255, 0.3);
    border-radius: 5px;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: all var(--fp-transition);
}

.a11y-toolbar .toggle-btn::after {
    content: none;
}

.a11y-toolbar .toggle-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

.a11y-toolbar .toggle-btn[aria-pressed="true"] {
    background: var(--fp-accent-light);
    border-color: var(--fp-accent);
    color: var(--fp-accent-mid);
}

.a11y-toolbar .toggle-btn:focus-visible {
    outline: none;
    box-shadow: var(--fp-focus-ring);
}

/* --- Seletor de idioma ----------------------------------- */
.language-switcher ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 2px;
}

.language-switcher a {
    display: inline-block;
    padding: 2px 8px;
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    border-radius: 99px;
    transition: all var(--fp-transition);
}

.language-switcher a:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.12);
}

.language-switcher a[aria-current="true"] {
    background: var(--fp-accent);
    color: #fff;
}

.language-switcher a:focus-visible {
    outline: none;
    box-shadow: var(--fp-focus-ring);
}

/* --- Masthead -------------------------------------------- */
.masthead {
    padding: 1.5rem 0 1.25rem;
    background: var(--fp-surface-2);
    border-bottom: 2px solid var(--fp-ink);
    text-align: center;
}

.masthead-inner {
    max-width: 1280px;
    margin-inline: auto;
    padding-inline: 1.5rem;
}

.site-title {
    font-family: var(--fp-font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1;
    margin: 0;
}

.site-title a {
    color: var(--fp-ink);
    text-decoration: none;
    transition: color var(--fp-transition);
}

.site-title a:hover {
    color: var(--fp-accent);
}

.site-title a:focus-visible {
    outline: none;
    box-shadow: var(--fp-focus-ring);
    border-radius: 4px;
}

.site-description {
    margin: 0.5rem 0 0;
    font-size: 0.625rem;
    font-weight: 500;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--fp-ink-muted);
}

.site-description::before,
.site-description::after {
    content: '—';
    margin: 0 0.75rem;
    opacity: 0.35;
}

/* --- Navegação ------------------------------------------- */
.main-navigation {
    border-bottom: 0.5px solid var(--fp-border);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    max-width: 1280px;
    margin-inline: auto;
    padding-inline: 1.5rem;
    position: relative;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0.5rem 0;
    gap: 0.25rem;
    flex-wrap: wrap;
    justify-content: center;
}

.nav-menu a {
    display: block;
    padding: 0.375rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--fp-ink-soft);
    text-decoration: none;
    border-radius: 6px;
    border: 0.5px solid transparent;
    transition: all var(--fp-transition);
    white-space: nowrap;
}

.nav-menu a:hover {
    color: var(--fp-accent-mid);
    background: var(--fp-accent-light);
}

.nav-menu .current-menu-item>a,
.nav-menu .current-page-ancestor>a {
    color: var(--fp-accent-mid);
    background: var(--fp-accent-light);
    border-color: #AFA9EC;
}

.nav-menu a:focus-visible {
    outline: none;
    box-shadow: var(--fp-focus-ring);
}

/* Submenu */
.nav-menu .menu-item-has-children {
    position: relative;
}

.nav-menu .sub-menu {
    position: absolute;
    top: calc(100% + 4px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 180px;
    background: var(--fp-surface);
    border: 0.5px solid var(--fp-border);
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .10);
    list-style: none;
    padding: 0.375rem;
    margin: 0;
    opacity: 0;
    visibility: hidden;
    transition: all var(--fp-transition);
    z-index: 100;
}

.nav-menu .menu-item-has-children:hover>.sub-menu,
.nav-menu .menu-item-has-children:focus-within>.sub-menu,
.nav-menu .sub-menu.is-open {
    opacity: 1;
    visibility: visible;
}

.nav-menu .sub-menu a {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

/* --- Menu toggle (mobile) -------------------------------- */
.menu-toggle {
    display: none;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.75rem;
    background: none;
    border: 0.5px solid var(--fp-border);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--fp-ink);
    cursor: pointer;
    position: absolute;
    right: 1.5rem;
    transition: all var(--fp-transition);
}

.menu-toggle:hover {
    background: var(--fp-surface-2);
}

.menu-toggle:focus-visible {
    outline: none;
    box-shadow: var(--fp-focus-ring);
}

.menu-toggle .icon-close {
    display: none;
}

/* --- Responsivo ----------------------------------------- */
@media (max-width: 768px) {
    .topbar-tagline {
        display: none;
    }

    .menu-toggle {
        display: inline-flex;
    }

    .nav-inner {
        justify-content: flex-start;
    }

    .nav-menu {
        display: none;
        flex-direction: column;
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: min(280px, 85vw);
        background: var(--fp-surface);
        padding: 4rem 1.25rem 1.25rem;
        border-left: 0.5px solid var(--fp-border);
        box-shadow: -4px 0 20px rgba(0, 0, 0, .12);
        overflow-y: auto;
        z-index: 999;
        justify-content: flex-start;
        gap: 0.25rem;
    }

    .nav-menu.is-open {
        display: flex;
    }

    .nav-menu a {
        font-size: 1rem;
        padding: 0.625rem 1rem;
    }

    .nav-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, .4);
        z-index: 998;
    }

    .nav-overlay.is-visible {
        display: block;
    }
}

body.nav-open {
    overflow: hidden;
}