:root{
    --azul-royal: #1f4ed8;
    --azul-escuro: #163ba3;
    --azul-claro: #eaf1ff;
    --branco: #ffff;
    --cinza: #f4f6fb;
    --texto: #1f2937;
    --sombra: 0 10px 25px rgba(0,0,0, 0.10);
    --borda: 1px solid rgba(31,78,216, 0.14);
}

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

hTML{
    scroll-behavior: smooth;
}

body{
    background-color: var(--cinza);
    color: var(--texto);
    line-height: 1.6;
}

a{
    text-decoration: none;
    color: inherit;
}

ul{
    list-style: none;
}

header{
    background: linear-gradient(135deg, var(--azul-royal), var(--azul-escuro));
    color: var(--branco);
    box-shadow: var(--sombra);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.topo{
    max-width: 1200px;
    margin: 0 auto;
    padding: 18px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}