:root {
    --primary-color: #4a6fa5;
    --secondary-color: #6bbaa7;
    --accent-color: #fba100;
    --background-color: #f5f7fa;
    --text-color: #333;
    --light-gray: #e0e0e0;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background-color: var(--white);
    border-radius: 10px;
    box-shadow: var(--shadow);
}

header h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 5px;
}

header h2 {
    color: var(--secondary-color);
    font-size: 1.2rem;
}

.game-container {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.sidebar {
    flex: 0 0 250px;
    background-color: var(--white);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.sidebar h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    border-bottom: 2px solid var(--light-gray);
    padding-bottom: 10px;
}

#curriculum-list {
    list-style-type: none;
}

#curriculum-list li {
    padding: 10px;
    margin-bottom: 5px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#curriculum-list li:hover {
    background-color: var(--light-gray);
}

#curriculum-list li.completed {
    color: var(--secondary-color);
    font-weight: bold;
}

#curriculum-list li.active {
    background-color: var(--primary-color);
    color: var(--white);
}

.progress-container {
    margin-top: 30px;
}

.progress-bar {
    height: 20px;
    background-color: var(--light-gray);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress {
    height: 100%;
    background-color: var(--secondary-color);
    width: 0%;
    transition: width 0.5s;
}

.main-content {
    flex: 1;
    background-color: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    min-height: 500px;
}

.screen {
    display: none;
}

.screen.active {
    display: block;
}

.content-area {
    margin: 20px 0;
    min-height: 300px;
}

.button-container {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}

button {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #3a5a84;
}

input[type="text"], input[type="password"] {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid var(--light-gray);
    border-radius: 5px;
}

#chat-container {
    background-color: var(--white);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

#chat-messages {
    height: 200px;
    overflow-y: auto;
    margin-bottom: 15px;
    padding: 10px;
    border: 1px solid var(--light-gray);
    border-radius: 5px;
}

.chat-input-container {
    display: flex;
    gap: 10px;
}

.chat-input-container input {
    flex: 1;
    margin-bottom: 0;
}

.message {
    margin-bottom: 10px;
    padding: 10px;
    border-radius: 5px;
}

.user-message {
    background-color: var(--light-gray);
    align-self: flex-end;
}

.ai-message {
    background-color: var(--primary-color);
    color: var(--white);
    align-self: flex-start;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--white);
    padding: 30px;
    border-radius: 10px;
    max-width: 500px;
    width: 100%;
}

.quiz-question {
    margin-bottom: 20px;
    padding: 15px;
    border: 1px solid var(--light-gray);
    border-radius: 5px;
}

.quiz-options {
    margin-top: 10px;
}

.quiz-option {
    display: block;
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid var(--light-gray);
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.quiz-option:hover {
    background-color: var(--light-gray);
}

.quiz-option.selected {
    background-color: var(--primary-color);
    color: var(--white);
}

.correct {
    background-color: var(--secondary-color);
    color: var(--white);
}

.incorrect {
    background-color: #e74c3c;
    color: var(--white);
}

@media (max-width: 768px) {
    .game-container {
        flex-direction: column;
    }
    
    .sidebar {
        flex: none;
        width: 100%;
    }
}