/* Reset básico */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fa;
    color: #1e293b;
    animation: fadeIn 1s ease-in;
    min-height: 100vh;
}

/* Animação inicial suave */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Cabeçalho */
header {
    background-color: #1e293b;
    padding: 16px 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

nav {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: flex-end;
}

nav a {
    color: #cbd5e1;
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.3s ease;
}

nav a:hover {
    color: #ffffff;
}

/* Conteúdo principal */
main {
    display: flex;
    justify-content: center;
    align-items: center;
    height: calc(100vh - 80px); /* ajustado para centralizar abaixo do header */
    text-align: center;
}

main h1 {
    font-size: 2.8rem;
    color: #1e3a8a;
    animation: fadeIn 1s ease-in-out;
}