/* ==========================
   RESET BÁSICO
========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background: #f2f2f2;
    color: #222;
    line-height: 1.6;
    font-size: 100%;
}

/* ==========================
   CABEÇALHO E RODAPÉ
========================== */
header, footer {
    background: #003366;
	background: linear-gradient(90deg, rgba(0, 51, 102, 1) 0%, rgba(83, 198, 237, 1) 100%);	
    color: white;
    padding: 20px;
    text-align: center;
}

nav ul {
    display: flex;
    justify-content: center;
    gap: 20px;
    list-style: none;
    padding: 10px 0;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

nav a[aria-current="page"] {
    text-decoration: underline;
}

/* ==========================
   CONTEÚDO EM 2 COLUNAS
========================== */
.colunas {
    display: flex;
    padding: 20px;
    gap: 20px;
}

.colunas article {
    width: 50%;
}
.colunas article ul {
    width: 100%;
	padding-left: 30px;
}
.colunas article img {
    width: 100%;
    border-radius: 10px;
}
.colunas aside {
    width: 50%
}
.colunas aside img {
    width: 100%;
    border-radius: 10px;
}
.colunas aside ul {
    width: 100%;
	padding-left: 30px;
}

/* ==========================
   MOBILE FIRST
========================== */
@media (max-width: 768px) {
    .colunas {
        flex-direction: column;
    }
}

/* ==========================
   BOTÕES DE ACESSIBILIDADE
========================== */
#acessibilidade-container {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 9999;
}

#acessibilidade-container button {
    background: #003366;
    color: #fff;
    border: solid 1px	;
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
}

#acessibilidade-container button:hover {
    background: #0055aa;
}

/* ==========================
   ALTO CONTRASTE
========================== */
body.contraste {
    background-color: black;
    color: yellow;
}

body.contraste header,
body.contraste footer {
    background-color: yellow;
    color: black;
}

body.contraste a {
    color: cyan;
}

body.contraste button {
    background-color: yellow;
    color: black;
    font-weight: bold;
    border: 2px solid black;
}