/* Reset básico e fontes */
body, html {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    background-color: #f4f7f6;
    color: #333;
}

.app-container {
    max-width: 700px;
    margin: 0 auto;
    padding: 15px;
    background-color: #fff;
    min-height: 100vh;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

header {
    text-align: center;
    padding-bottom: 10px;
    margin-bottom: 10px;
}

header h1 {
    color: #2c3e50;
    margin-bottom: 20px;
}

/* --- Abas de Navegação (Visíveis na seleção) --- */
#tabs-container {
    display: flex; /* Mostrar por padrão */
    margin-bottom: 0px; /* Sem espaço abaixo das abas */
    border-bottom: 1px solid #ccc;
}

.tab-button {
    padding: 10px 20px;
    cursor: pointer;
    border: none;
    background-color: transparent;
    font-size: 1.1em;
    color: #7f8c8d;
    border-bottom: 3px solid transparent;
    margin-bottom: -1px; /* Alinha com a borda do container */
    transition: color 0.2s, border-bottom-color 0.2s;
}

.tab-button.active {
    color: #3498db;
    border-bottom-color: #3498db;
    font-weight: bold;
}

.tab-button:hover:not(.active) {
    color: #333;
}

/* --- Container de Seleção Inicial --- */
#selection-container {
    background-color: #f9f9f9;
    border-radius: 0 0 8px 8px; /* Arredonda cantos inferiores */
    margin-bottom: 20px;
    border: 1px solid #e0e0e0;
    border-top: none; /* Remove borda superior que agora é das abas */
    /* display: block; */ /* Mostrar por padrão (controlado pelo JS inicial) */
    min-height: 200px; /* Altura mínima para a área de seleção */
}

/* --- Conteúdo das Abas de Seleção --- */
.selection-tab-content {
    display: none; /* Escondido por padrão */
    padding: 20px 15px 15px 15px; /* Padding interno (mais em cima) */
}

.selection-tab-content.active {
    display: block; /* Mostra o conteúdo da aba ativa */
}

.selection-tab-content h2 { /* Título "Escolha um Quiz/Flashcard" */
     margin-top: 0;
    margin-bottom: 20px;
    color: #333;
    text-align: center;
    font-size: 1.4em;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

/* Estilos para módulos e listas dentro da seleção */
.module-group {
    margin-bottom: 15px;
}

.module-group h4 { /* Título do Módulo na seleção */
    margin-top: 15px;
    margin-bottom: 10px;
    padding-bottom: 5px;
    border-bottom: 2px solid #4CAF50;
    color: #2c3e50;
    font-size: 1.2em;
    font-weight: normal;
}
.selection-tab-content .module-group:first-of-type h4 {
     margin-top: 5px;
}

.activity-list {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.activity-list li button {
    display: block;
    width: 100%;
    padding: 12px 15px;
    margin-bottom: 8px;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 5px;
    text-align: left;
    cursor: pointer;
    font-size: 1em;
    color: #3498db;
    transition: background-color 0.2s, color 0.2s, transform 0.1s, box-shadow 0.2s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.activity-list li button:hover {
    background-color: #3498db;
    color: white;
    border-color: #2980b9;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
.activity-list li button:active {
    transform: scale(0.98);
}


/* --- Área Principal de Conteúdo (Quiz/Flashcard Ativo) --- */
#main-content {
    /* Escondido inicialmente, mostrado pelo JS após seleção */
     padding-top: 10px;
}

/* Container das atividades - Escondidos por padrão */
#quiz-content,
#flashcard-content {
    display: none;
}


/* --- Estilos Internos do Quiz --- */
#quiz-area, #results-area {
    padding: 10px 0;
}
.progress-container { margin-bottom: 20px; font-size: 0.9em; color: #555; }
.progress-bar-outer { width: 100%; background-color: #e0e0e0; border-radius: 5px; height: 10px; margin-top: 5px; }
#progress-bar-inner { height: 100%; background-color: #4CAF50; border-radius: 5px; width: 0%; transition: width 0.3s ease-in-out; }
.module-topic { font-size: 0.85em; color: #777; margin-bottom: 10px; background-color: #f9f9f9; padding: 8px; border-left: 3px solid #4CAF50; border-radius: 3px; }
.module-topic strong { color: #333; }
#question-text { font-size: 1.2em; margin-bottom: 20px; color: #2c3e50; }
#options-container button { display: block; width: 100%; padding: 12px; margin-bottom: 10px; background-color: #f0f0f0; border: 1px solid #ddd; border-radius: 5px; text-align: left; cursor: pointer; font-size: 1em; transition: background-color 0.2s, border-color 0.2s; }
#options-container button:hover { background-color: #e9e9e9; }
#options-container button.selected { background-color: #4a90e2; color: white; border-color: #357ABD; }
#options-container button.correct { background-color: #4CAF50; color: white; border-color: #388E3C; }
#options-container button.incorrect { background-color: #f44336; color: white; border-color: #D32F2F; }
#options-container button:disabled { cursor: not-allowed; opacity: 0.7; }
#feedback-container { padding: 15px; margin-top: 20px; border-radius: 5px; display: none; } /* Garantir display none inicial */
#feedback-container.correct { background-color: #e8f5e9; border-left: 5px solid #4CAF50; }
#feedback-container.incorrect { background-color: #ffebee; border-left: 5px solid #f44336; }
#feedback-text { font-weight: bold; margin-bottom: 5px; }
#explanation-text { font-size: 0.9em; }
.navigation-buttons { margin-top: 35px; display: flex; justify-content: space-between; } /* Aumentada margem superior */
.navigation-buttons button { padding: 10px 20px; background-color: #3498db; color: white; border: none; border-radius: 5px; cursor: pointer; font-size: 1em; transition: background-color 0.2s; }
.navigation-buttons button:hover { background-color: #2980b9; }
.navigation-buttons button:disabled { background-color: #bdc3c7; cursor: not-allowed; }
#prev-btn, #prev-card-btn { background-color: #7f8c8d; }
#prev-btn:hover, #prev-card-btn:hover { background-color: #606f70; }
#results-area { text-align: center; display: none;} /* Garantir display none inicial */
#results-area h2 { color: #2c3e50; }
#results-area p { font-size: 1.1em; margin-bottom: 10px; }
#review-container { margin-top: 20px; text-align: left; }
.review-item { background-color: #f9f9f9; padding: 15px; margin-bottom: 15px; border-radius: 5px; border-left: 3px solid #ccc; }
.review-item.correct { border-left-color: #4CAF50; }
.review-item.incorrect { border-left-color: #f44336; }
.review-item.skipped { border-left-color: #f39c12; } /* Estilo opcional para puladas */
.review-item p { margin: 5px 0; font-size: 0.95em; }
.review-item .review-question { font-weight: bold; }
.review-item .review-user-answer { color: #555; }
.review-item .review-correct-answer { color: #4CAF50; font-weight: bold; }
.review-item .review-explanation { font-style: italic; font-size: 0.85em; color: #777; margin-top: 8px; }
#restart-btn { padding: 12px 25px; background-color: #2ecc71; color: white; border: none; border-radius: 5px; cursor: pointer; font-size: 1em; margin: 10px 5px; transition: background-color 0.2s; }
#restart-btn:hover { background-color: #27ae60; }


/* --- Estilos Internos dos Flashcards --- */
#flashcard-area {
    padding: 10px 0;
    display: none; /* Garantir display none inicial */
}
.flashcard-progress { text-align: center; margin-bottom: 15px; font-size: 0.9em; color: #555; background-color: #f9f9f9; padding: 10px; border-radius: 5px; }
.flashcard-progress p { margin: 5px 0; }
#reset-flashcard-progress-btn { background: none; border: 1px solid #bdc3c7; color: #7f8c8d; padding: 4px 10px; font-size: 0.85em; border-radius: 4px; cursor: pointer; margin-top: 8px; transition: background-color 0.2s, color 0.2s, border-color 0.2s; display: inline-block; }
#reset-flashcard-progress-btn:hover { background-color: #ecf0f1; color: #333; border-color: #adb5bd; }
#flashcard-container { background-color: transparent; height: auto; perspective: 1000px; margin-bottom: 35px; /* Aumentada margem */ border-radius: 10px; display: flex; align-items: stretch; }
.card-inner { display: grid; width: 100%; min-height: 250px; height: auto; text-align: center; transition: transform 0.6s; transform-style: preserve-3d; box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2); border-radius: 10px; }
#flashcard-container.is-flipped .card-inner { transform: rotateY(180deg); }
.card-front, .card-back { grid-column: 1 / -1; grid-row: 1 / -1; width: 100%; min-height: 100%; height: auto; -webkit-backface-visibility: hidden; backface-visibility: hidden; display: flex; flex-direction: column; justify-content: flex-start; padding: 20px; box-sizing: border-box; border-radius: 10px; border: 1px solid #ddd; flex-grow: 1; }
.card-front { background-color: #ffffff; color: black; }
.card-back { background-color: #eaf6ff; color: #333; transform: rotateY(180deg); }
.card-context { font-size: 0.85em; color: #777; text-align: left; margin-bottom: 10px; line-height: 1.3; flex-shrink: 0; }
.card-context strong { color: #555; }
.card-question, .card-answer { font-size: 1.15em; flex-grow: 1; flex-shrink: 1; text-align: center; margin-bottom: 15px; overflow-y: auto; overflow-x: hidden; word-wrap: break-word; overflow-wrap: break-word; display: flex; align-items: flex-start; justify-content: center; padding: 5px 0; }
#reveal-btn { padding: 10px 20px; background-color: #2ecc71; color: white; border: none; border-radius: 5px; cursor: pointer; font-size: 1em; transition: background-color 0.2s; align-self: center; margin-top: auto; flex-shrink: 0; }
#reveal-btn:hover { background-color: #27ae60; }
.card-actions { text-align: center; margin-top: auto; padding-top: 15px; flex-shrink: 0; }
.card-actions p { margin-bottom: 10px; font-size: 0.95em; color: #555; }
.card-actions button { padding: 8px 15px; margin: 0 5px; border-radius: 5px; cursor: pointer; font-size: 0.9em; transition: background-color 0.2s, color 0.2s, border-color 0.2s; }
#known-btn { background-color: #4CAF50; color: white; border: 1px solid #388E3C; }
#known-btn:hover { background-color: #388E3C; }
#review-btn { background-color: #f39c12; color: white; border: 1px solid #c87f0a; }
#review-btn:hover { background-color: #c87f0a; }
.flashcard-nav { justify-content: space-between; } /* Herda de .navigation-buttons */


/* Botões "Voltar" e "Restart" */
#back-to-selection-btn, #back-to-selection-flash-btn {
    padding: 12px 25px;
    background-color: #e67e22; /* Laranja */
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    margin: 10px 5px;
    transition: background-color 0.2s;
    display: inline-block; /* Para margin funcionar corretamente */
}
#back-to-selection-btn:hover, #back-to-selection-flash-btn:hover {
    background-color: #d35400;
}
/* Garante que o botão de voltar flashcard fique bem posicionado */
#back-to-selection-flash-btn {
    display: block; /* Faz ocupar a largura e permite centralizar com margin auto */
    margin: 25px auto 10px auto; /* Margem superior/inferior e centralizado */
    width: fit-content; /* Ajusta a largura ao conteúdo */
}


/* --- Footer --- */
footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #eee;
    font-size: 0.8em;
    color: #777;
}

/* --- Media Queries --- */
@media (min-width: 600px) {
    /* Quiz */
    #options-container {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }
    #options-container button {
        margin-bottom: 0;
    }

    /* Seleção de Atividades */
    .activity-list {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 10px;
    }
     .activity-list li button {
        margin-bottom: 0;
    }

     /* Flashcard */
    .card-question, .card-answer {
        font-size: 1.25em;
    }
}