/* --- Configurações Gerais --- */
body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f2f5;
    color: #333;
    line-height: 1.6;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 20px;
    box-sizing: border-box;
}

/* --- Container Principal --- */
.container {
    width: 100%;
    max-width: 1200px; /* Aumentado a largura para acomodar a sidebar */
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
    padding: 40px;
    box-sizing: border-box;
}

/* --- Layout Principal (Header + Content) --- */
.main-content {
    display: flex;
    gap: 30px; /* Espaço entre a sidebar e o conteúdo */
    align-items: flex-start;
}

/* --- Sidebar (Menu Lateral) --- */
.sidebar {
    width: 250px;
    flex-shrink: 0; /* Impede que a sidebar encolha */
    padding: 20px;
    background-color: #ecf0f1; /* Fundo mais claro para destaque */
    border-radius: 8px;
    position: sticky; /* Mantém o menu visível ao rolar */
    top: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.sidebar h3 {
    color: #2c3e50;
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.2em;
    border-bottom: 2px solid #bdc3c7;
    padding-bottom: 8px;
}

.sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar ul li {
    margin-bottom: 8px;
}

.sidebar ul li a {
    text-decoration: none;
    color: #34495e;
    display: block;
    padding: 8px 10px;
    border-radius: 4px;
    transition: background-color 0.3s;
    font-size: 0.95em;
}

/* Estilo para destaque (hover, foco e ativo por JavaScript) */
.sidebar ul li a:hover, 
.sidebar ul li a:focus, 
.sidebar ul li a.active {
    background-color: #3498db; /* Cor de destaque ao passar o mouse ou ativo */
    color: #ffffff;
    font-weight: 600;
    outline: none; /* Remove o outline padrão do navegador se o foco for visualmente claro */
}

/* --- Área de Vídeos (Content) --- */
main {
    flex-grow: 1; /* Permite que o conteúdo ocupe o espaço restante */
}


/* --- Cabeçalho --- */
header {
    text-align: center;
    padding-bottom: 30px;
    margin-bottom: 30px;
    border-bottom: 1px solid #e0e0e0;
}

header h1 {
    color: #2c3e50;
    margin-bottom: 10px;
    font-size: 2.5em;
    font-weight: 600;
}

header p {
    color: #666;
    font-size: 1.1em;
}

/* --- Seção dos Vídeos --- */
.video-section {
    /* Ajustes para links âncora: move o alvo do scroll um pouco para baixo */
    padding-top: 10px; 
    margin-top: -10px; 
    margin-bottom: 40px; 
    background-color: #f9f9f9; 
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

.video-section h2 {
    color: #3498db;
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 1.8em;
    font-weight: 600;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
    display: inline-block;
}

/* --- Estilo para o <video> HTML5 --- */
video {
    width: 100%;
    height: auto;
    border-radius: 8px;
    background-color: #000;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

/* --- Rodapé --- */
footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
    font-size: 0.9em;
    color: #888;
}

/* --- Responsividade (para telas menores) --- */
@media (max-width: 992px) {
    /* Em telas menores, a sidebar vai para o topo e ocupa a largura total */
    .main-content {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        position: static; /* Remove o sticky em mobile */
        margin-bottom: 20px;
    }
    
    /* Permite o scroll horizontal no menu lateral em mobile */
    .sidebar ul {
        display: flex;
        overflow-x: auto; 
        padding-bottom: 10px; /* Para melhor visualização do scroll */
    }
    
    .sidebar ul li {
        flex-shrink: 0;
        margin-right: 10px;
    }
}