.main-header {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 1rem 2rem;
    background: none;
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--color-border);
    position: relative;
    z-index: 3000;
    width: 100%;
    box-shadow: none;
    min-height: 104px;
}

/* Botão do menu (hamburger) - escondido no desktop para evitar artefatos/"pixel" */
.menu-toggle {
    display: none;
    background: transparent;
    border: 0;
    padding: 0;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.hamburger {
    position: relative;
    width: 20px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 20px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.hamburger::before { top: -6px; }
.hamburger::after { top: 6px; }

.menu-toggle.active .hamburger { background: transparent; }
.menu-toggle.active .hamburger::before { transform: translateY(6px) rotate(45deg); }
.menu-toggle.active .hamburger::after { transform: translateY(-6px) rotate(-45deg); }

.logo {
    grid-column: 1;
    justify-self: start;
}

.logo a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.logo img {
    display: block;
    height: 96px;
    width: auto;
}

.main-nav {
    grid-column: 2;
}

.main-nav ul {
    display: flex;
    align-items: center; 
    gap: 0.5rem; 
    list-style: none;
    padding: 0;
    margin: 0;
}

.main-nav ul li a {
    position: relative; 
    display: flex;
    justify-content: center;
    align-items: center;
    height: 40px;
    padding: 0 1.5rem; 
    color: var(--color-text-base);
    text-decoration: none;
    border-radius: 50px; 
    overflow: hidden; 
    z-index: 1;
    transition: color 0.3s ease;
    font-size: 0.95rem; 
    font-weight: 500;
    white-space: nowrap; 
}

.main-nav ul li a:hover {
    color: var(--color-primary); 
}

.main-nav ul li a::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 200%; 
    height: 200%;
    z-index: -2; 
    background: conic-gradient(
        transparent,
        var(--color-primary-action),
        var(--color-primary),
        transparent 40%
    );
    animation: spin 4s linear infinite;
    animation-play-state: paused; /* Pausa a animação por padrão para evitar artefatos */
    opacity: 0; 
    transition: opacity 0.4s ease;
}

.main-nav ul li a:hover::before {
    opacity: 1; 
    animation-play-state: running; /* Inicia a animação apenas no hover */
}

.main-nav ul li a::after {
    content: '';
    position: absolute;
    inset: 2px;
    background: var(--color-background-start); 
    border-radius: 50px; 
    z-index: -1; 
}

@keyframes spin {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* === Botão CTA (Contate-nos) — versão minimalista e fluida === */
.nav-cta {
    position: relative;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    white-space: nowrap;
    height: 40px; /* igual aos links do menu */
    padding: 0 1.5rem; /* mesmo padding horizontal */
    margin: 0; /* evita diferença de distância entre itens */
    font-size: 0.95rem; /* igual aos outros links */
    border-radius: 999px;
    color: var(--color-primary) !important;
    font-weight: 600 !important;
    background: linear-gradient(135deg, rgba(130, 177, 255, 0.18), rgba(0, 123, 255, 0.18));
    background-size: 200% 200%;
    border: 1px solid rgba(130, 177, 255, 0.35);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(4px);
    transition: transform 0.2s ease, background-position 0.4s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.nav-cta:hover, .nav-cta:focus {
    transform: translateY(-2px) scale(1.02);
    background-position: 100% 0%;
    border-color: var(--color-primary-accent);
    box-shadow: 0 6px 18px rgba(0, 123, 255, 0.25);
    color: var(--color-primary) !important;
}

/* === Navegação responsiva (mobile) === */
@media (max-width: 900px) {
    .menu-toggle { display: inline-flex; }

    .main-header { grid-template-columns: 1fr auto; }

    .main-nav { position: relative; z-index: 3500; }

    .logo img { height: 72px; }

    /* Backdrop overlay when menu is open */
    .nav-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.45);
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.25s ease;
        z-index: 3999;
    }

    .nav-overlay.open {
        opacity: 1;
        pointer-events: auto;
    }

    /* Off-canvas menu */
    .main-nav ul {
        position: fixed;
        top: 0;
        right: 0;
        height: 100vh;
        width: 82vw;
        max-width: 340px;
        display: flex;
        flex-direction: column;
        gap: 0.25rem;
        padding: 1rem;
        padding-top: 80px; /* space for header */
        background: var(--color-background-end);
        border-left: 1px solid var(--color-border);
        box-shadow: -8px 0 24px rgba(0,0,0,0.35);
        z-index: 4000;
        transform: translateX(100%);
        transition: transform 0.25s ease;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

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

    .main-nav ul li a {
        width: 100%;
        min-height: 48px;
        padding: 0 1rem;
        border-radius: 10px;
        font-size: 1rem;
    }

    /* Garantir que o CTA siga exatamente as mesmas medidas no mobile */
    .main-nav ul li .nav-cta {
        width: 100%;
        min-height: 48px;
        height: 48px;
        padding: 0 1rem;
        border-radius: 10px;
        font-size: 1rem;
        margin: 0;
    }

    /* Ajusta a borda da animação para o layout mobile */
    .main-nav ul li a::after {
        inset: 1px; /* Borda mais fina */
        border-radius: 10px; /* Alinha com o raio do botão mobile */
    }

    /* Prevent body scroll when menu is open */
    body.menu-open { overflow: hidden; }
}