/* ===========================
   VARIÁVEIS GLOBAIS
   =========================== */
:root {
    --white-color: #FFFFFF;
    --primary-color: #0A1128;
    --gap: 3rem;
}

/* ===========================
   RESET E ESTILOS BASE
   =========================== */
body,
html {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Open Sans', sans-serif;
}

p {
    text-align: justify;
    text-justify: inter-word;
}

/* ===========================
   BACKGROUNDS
   =========================== */
.main-bg {
    background-image: url("../img/main-bg.jpg");
    background-size: 100% 60%;
    /* largura 100%, altura 60% */
    background-position: center center;
    background-repeat: no-repeat;
}

.white-bg {
    background: var(--white-color);
    color: var(--primary-color);
}

/* ===========================
   CONTEÚDO PRINCIPAL
   =========================== */
.main-content {
    max-width: 50rem;
    margin: 0 auto;
    padding: 5rem var(--gap);
    width: 50%;
}

.section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* ===========================
   HEADER FIXO
   =========================== */
/* HEADER FIXO - desktop + mobile */
.header-fixed {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px;
    display: flex;
    align-items: center;
    padding: 0 1rem;
    background-color: rgba(255, 255, 255, 0.95);
    z-index: 9999;
    /* abaixo do menu flutuante */
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.header-fixed .logo-img {
    flex-shrink: 0;
    display: block;
    /* garante visibilidade */
}

.header-fixed .logo-img img {
    width: 40px;
    height: auto;
    display: block;
}


.header-fixed h1 {
    font-size: 1rem;
    margin-left: 0.75rem;
}

/* MOBILE */
@media (max-width: 767px) {

    /* Menu flutuante sobre o conteúdo */
    .menu {
        position: fixed;
        /* flutua sobre o conteúdo */
        top: 0;
        left: -250px;
        /* escondido inicialmente */
        width: 220px;
        height: 100%;
        padding-top: 60px;
        /* espaço para header */
        flex-direction: column;
        background-color: var(--white-color);
        z-index: 10000;
        /* acima do header */
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
        transition: left 0.3s ease;
        overflow-y: auto;
    }

    /* Quando o menu é aberto pelo checkbox */
    #close-menu:checked~.menu {
        left: 0;
    }

    .menu nav ul {
        flex-direction: column;
        /* links empilhados verticalmente */
        padding: 0;
        margin: 0;
    }

    .menu nav ul li {
        margin: 1rem 0;
    }

    .menu nav ul li a {
        font-size: 0.95rem;
        padding: 0.5rem 1rem;
        display: block;
    }
}



/* ===========================
   GRID E SEÇÕES
   =========================== */
.grid {
    display: grid;
    gap: 2rem;
}

.grid-one-content article {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 1rem;
    border-radius: 5px;
}

/* ===========================
   FOOTER
   =========================== */
.footer {
    display: flex;
    text-align: center;
    padding: 2rem 1rem;
    font-size: 0.9rem;
}

/* ===========================
   BOTÃO VOLTAR AO TOPO
   =========================== */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-color);
    color: var(--white-color);
    padding: 0.5rem 0.75rem;
    border-radius: 50%;
    text-decoration: none;
    font-size: 1.25rem;
    z-index: 9999;
}