/* --- ESTILOS GERAIS E FUNDO DE UNIVERSO EM TILES --- */
body {
    background-image: url('../imgs/fundo_universo.jpg');
    font-size: 19px;
    text-align: justify;
    color: #E0E0E0;
    margin: 0;
    padding: 0;
}

/* --- BARRA DE NAVEGAÇÃO DO TOPO --- */
.top-nav {
    width: 100%;
    background-color: rgba(10, 20, 40, 0.9);
    padding: 10px 0;
    text-align: center;
    border-bottom: 2px solid #4169E1;
    box-shadow: 0 2px 10px rgba(135, 206, 235, 0.4);
    margin-bottom: 20px;
}

.top-nav a {
    font-family: "Roboto Mono", monospace;
    color: #E0E0E0;
    text-decoration: none;
    font-size: 1.1em;
    padding: 10px 20px;
    margin: 0 10px;
    transition: all 0.3s ease;
}

.top-nav a:hover {
    color: #FFD700;
    text-shadow: 0 0 8px rgba(255, 215, 0, 0.8);
}


/* --- HEADER E TÍTULO CINTILANTE AZUL --- */
.header-container {
    width: 70%;
    margin: 20px auto;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.titulo-ceu {
    font-family: "Roboto Mono", monospace;
    color: #87CEEB;
    font-size: 2.5em;
    font-weight: bold;
    text-transform: uppercase;
    text-shadow: 1px 1px 2px #000;
    margin-bottom: 5px;
    animation: brilho-azul 2.5s infinite ease-in-out;
    transition: text-shadow 0.3s ease-out;
}

.titulo-ceu:hover {
    animation: none;
    text-shadow: 
        0 0 5px #fff,
        0 0 10px #fff,
        0 0 20px #00BFFF,
        0 0 30px #00BFFF,
        0 0 40px #00BFFF,
        0 0 50px #00BFFF;
    cursor: pointer;
}

.data-ceu {
    font-family: "Roboto Mono", monospace;
    color: #FFD700;
    font-size: 1.1em;
    margin-left: 5px;
    text-shadow: 1px 1px 2px #000;
}


/* Animação de brilho adaptada para tons de azul */
@keyframes brilho-azul {
    0%, 100% {
        text-shadow: 
            0 0 5px #87CEEB, 
            0 0 10px #4682B4, 
            0 0 15px #4169E1;
        opacity: 1;
    }
    50% {
        text-shadow: 
            0 0 2px #87CEEB, 
            0 0 5px #4682B4, 
            0 0 8px #4169E1;
        opacity: 0.9;
    }
}


/* --- CAIXA DE CONTEÚDO PRINCIPAL COM BORDA GROSSA --- */
.container {
    width: 70%;
    margin: auto;
    background-color: rgba(10, 20, 40, 0.9);
    padding: 30px;
    padding-left: 40px;
    
    border-left: 20px solid transparent;
    border-image-slice: 1;
    /* DEGRADÊ MAIS SUAVE */
    border-image-source: linear-gradient(
        to bottom,
        #87CEEB,
        #4169E1,
        #00008B,
        #FFD700,
        #FFC300,  /* Cor de transição adicionada */
        #FFA500
    );
}

/* --- ESTILOS ADAPTADOS PARA O NOVO TEMA --- */
footer {
    background-color: rgba(10, 20, 40, 0.9);
    width: 70%;
    padding: 15px;
    font-size: 20px;
    color: #E0E0E0;
    margin: 20px auto;
    justify-content: center;
    display: flex;
    border-radius: 10px;
}

.navegacao-textos {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    margin-top: 40px;
    border-top: 3px solid #4169E1;
    width: 70%;
    margin-left: auto;
    margin-right: auto;
}

.nav-link, .nav-download {
    color: #FFFFFF;
    text-decoration: none;
    background-color: #4169E1;
    font-weight: bold;
    padding: 10px 15px;
    border: 1px solid #87CEEB;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-link:hover {
    background-color: #FFD700;
    color: #000000;
    border-color: #FFA500;
}

.nav-download {
    background-color: #FFA500;
    color: #000000;
    border-color: #FFD700;
}

.nav-download:hover {
    background-color: #87CEEB;
    color: #000000;
}

.nav-link.hidden {
    visibility: hidden;
    pointer-events: none;
}

/* --- AJUSTES PARA CELULAR --- */
@media (max-width: 768px) {
    .header-container, .container, .navegacao-textos, footer {
        width: 90%;
    }
    .titulo-ceu {
        font-size: 1.8em;
    }
    .top-nav a {
        padding: 10px 5px;
        margin: 0 2px;
        font-size: 1em;
    }
    body {
        text-align: left;
    }
}