/* ===============================
   Header & Navegação
   - Header fixo, nav, menu e overlay
=============================== */
header {
    background-color: var(--header-bg);
    box-shadow: 0 4px 16px rgba(45, 19, 58, 0.10);
    height: 60px;
    position: fixed;
    top: 0; left: 0; width: 100%;
    z-index: 1000;
    border-bottom-left-radius: 70px;
    border-bottom-right-radius: 70px;
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    background-color: var(--header-bg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0 2rem;
}

/* Logo do topo */
.logo-img {
    height: 60px;
    width: auto;
    display: block;
    object-fit: contain;
    max-width: 300px;
}

/* Menu desktop */
.nav-menu {
    flex: 1 1 0;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 3rem;
    background: none;
    border: none;
    position: static;
    height: 60px;
    padding: 0;
}

/* Links de navegação */
.nav-link {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: color var(--transition-speed), transform var(--transition-speed);
    position: relative;
    padding: 0.2rem 0.8rem;
}

/* Garante branco para normal e visitado */
.nav-link:link,
.nav-link:visited { color: #fff; }

/* Hover com animação sublinhada mantendo texto branco */
.nav-link:hover { color: #fff; transform: translateY(-2px); }

/* Sub-linha animada dos links */
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px; left: 0;
    width: 0; height: 2px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    transition: width var(--transition-speed);
}
.nav-link:hover::after { width: 100%; }

/* Alternância de tema (botão) */
.theme-toggle { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.theme-toggle button { background: transparent; border: none; cursor: pointer; padding: 8px; border-radius: 50%; transition: all 0.3s ease; }
.theme-toggle button:hover { background: rgba(255, 255, 255, 0.12); }
.theme-toggle button i { color: #fff; font-size: 1.2rem; transition: all 0.3s ease; }

/* Ícone no modo escuro em destaque */
[data-theme="dark"] .theme-toggle button i { color: var(--secondary-color); }

/* Menu hambúrguer (mobile) */
.menu-toggle { display: none; }

@media (max-width: 768px) {
    /* Header mais compacto */
    header { height: 48px; }

    /* Nav em linha: logo esquerda, tema centro, hambúrguer direita */
    nav {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 48px;
        padding: 0 0.5rem;
    }

    .logo { order: 1; }
    .theme-toggle { 
        order: 2; 
        margin-left: 0; 
    }
    .menu-toggle { 
        order: 3; 
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        color: white;
        font-size: 1.5rem;
    }

    /* Normalizar alturas/tamanhos */
    .logo-img { height: 36px; }
    .theme-toggle button { padding: 6px; }
    .theme-toggle button i { font-size: 1.5rem; }

    /* Dropdown do menu em mobile */
    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px; right: 0; left: auto;
        background: rgba(108, 62, 182, 0.2);
        width: 220px;
        padding: 1rem;
        border-radius: 0 0 0 8px;
        z-index: 999;
        height: auto;
    }
    .nav-menu.show { display: flex; }

    .nav-menu a {
        padding: 10px;
        color: #fff !important;
        text-decoration: none;
        font-size: 1.1rem;
        transition: background 0.3s ease;
        border-radius: 5px;
    }
    .nav-menu a.active { background: rgba(108, 62, 182, 0.6); }
    .nav-menu a:hover { background: rgba(108, 62, 182, 0.4); }
}

/* Overlay de escurecimento quando o menu está aberto */
.menu-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background: rgba(44, 19, 58, 0.90);
    z-index: 998;
    transition: opacity 0.3s ease;
}
.menu-overlay.show { display: block; opacity: 1; }