/* ===========================================
   NAVBAR COMPONENT — LUXURY STYLE
   =========================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 1.6rem 4vw;
    background-color: transparent;
    border-bottom: 1px solid transparent;
    transition: padding 0.5s var(--ease-out-expo),
                background-color 0.5s var(--ease-out-expo),
                backdrop-filter 0.5s var(--ease-out-expo),
                border-color 0.5s var(--ease-out-expo);
}

/* Fundo de vidro quando a página rola */
.header.scrolled {
    padding: 0.9rem 4vw;
    background-color: rgba(10, 10, 10, 0.72);
    -webkit-backdrop-filter: blur(16px) saturate(120%);
    backdrop-filter: blur(16px) saturate(120%);
    border-bottom: 1px solid rgba(205, 138, 82, 0.18);
}

/* ----- Logo ----- */
.logo {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    z-index: 101;
    transition: opacity 0.4s var(--ease-out-expo);
}

.logo-img {
    /* Logo preta → toda branca via filtro (fundo é transparente) */
    height: 34px;
    width: auto;
    display: block;
    filter: brightness(0) invert(1);
    transition: height 0.5s var(--ease-out-expo);
}

/* Encolhe junto com o navbar ao rolar */
.header.scrolled .logo-img {
    height: 28px;
}

.logo:hover {
    opacity: 0.8;
}

/* ----- Navegação ----- */
.nav {
    display: flex;
    gap: 2.8rem;
    align-items: center;
}

.nav-link {
    font-family: var(--font-serif);
    color: #c4c4c8;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 300;
    letter-spacing: 0.04rem;
    white-space: nowrap;
    position: relative;
    padding: 0.4rem 0;
    transition: color 0.4s var(--ease-out-expo);
}

/* Sublinhado que expande a partir do centro, em cobre */
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0%;
    height: 1px;
    background-color: var(--gold);
    transition: width 0.4s var(--ease-out-expo), left 0.4s var(--ease-out-expo);
}

.nav-link:hover {
    color: #ffffff;
}

.nav-link:hover::after {
    width: 100%;
    left: 0;
}

/* ----- Botão CTA ----- */
.nav-cta {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--gold);
    text-decoration: none;
    white-space: nowrap;
    padding: 0.75rem 1.6rem;
    border: 1px solid rgba(205, 138, 82, 0.5);
    transition: background-color 0.45s var(--ease-out-expo),
                color 0.45s var(--ease-out-expo),
                border-color 0.45s var(--ease-out-expo);
}

.nav-cta:hover {
    background-color: var(--gold);
    color: #0a0a0a;
    border-color: var(--gold);
}

.nav-cta--mobile {
    display: none; /* só aparece dentro do overlay no mobile */
}

/* ----- Botão hambúrguer ----- */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 34px;
    height: 34px;
    padding: 0;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 101;
}

.nav-toggle span {
    display: block;
    width: 26px;
    height: 1.5px;
    background-color: #ffffff;
    transition: transform 0.4s var(--ease-out-expo), opacity 0.3s var(--ease-out-expo);
}

.nav-toggle span:nth-child(1) { align-self: flex-end; width: 20px; }
.nav-toggle span:nth-child(3) { align-self: flex-end; width: 20px; }

.nav-toggle:hover span { width: 26px; background-color: var(--gold); }

/* Estado aberto → vira um "X" */
.nav-toggle.open span:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
    width: 26px;
}
.nav-toggle.open span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
    width: 26px;
}

/* ===========================================
   RESPONSIVIDADE — OVERLAY MOBILE
   =========================================== */
@media (max-width: 900px) {
    .nav-cta--desktop {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        inset: 0;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2.4rem;
        /* Fundo sólido: o backdrop-filter em tela cheia travava o mobile
           (desfoque de toda a página, com imagens pesadas, a cada frame) */
        background-color: #0a0a0a;
        transform: translateX(100%);
        transition: transform 0.6s var(--ease-premium);
        z-index: 95;
    }

    .nav.open {
        transform: translateX(0);
    }

    /* CRÍTICO: o backdrop-filter do header cria um "containing block" que
       prende o overlay fixo ao tamanho do header (~60px) e faz o fundo do
       menu sumir. Ao abrir o menu, zera o filtro para o overlay cobrir a tela. */
    .header:has(.nav.open) {
        background-color: transparent;
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
        border-color: transparent;
    }

    .nav-link {
        font-size: 1.7rem;
        color: #e8e8ea;
    }

    .nav-cta--mobile {
        display: inline-block;
        margin-top: 1rem;
        font-size: 0.85rem;
        padding: 0.9rem 2.2rem;
    }
}

/* ===========================================
   ACESSIBILIDADE
   =========================================== */
@media (prefers-reduced-motion: reduce) {
    .nav {
        transition-duration: 0.2s;
    }
}