:root {
    --primary: #0066cc;
    --secondary: #003366;
    --accent: #ff9900;
    --light: #f5f7fa;
    --dark: #333;
    --success: #28a745;
    --error: #dc3545;
}

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

body {
    background-color: var(--light);
    color: var(--dark);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    overflow: hidden;
}

header {
    background-color: var(--primary);
    color: white;
    padding: 20px;
    text-align: center;
}

.progress-container {
    background-color: #e9ecef;
    border-radius: 4px;
    position: relative;
    margin: 15px 20px;
    height: 10px;
    width: calc(100% - 40px);
}

.progress-bar {
    height: 10px;
    background-color: var(--accent);
    border-radius: 4px;
    width: 0%;
    transition: width 0.3s ease;
}

.course-info {
    padding: 20px;
    background-color: #f8f9fa;
    border-bottom: 1px solid #e9ecef;
}

.module-container {
    padding: 20px;
    display: none;
}

.module-container.active {
    display: block;
}

h1 {
    margin-bottom: 15px;
}

h2 {
    color: var(--secondary);
    margin: 2rem 0 15px;
    padding-bottom: 5px;
    border-bottom: 2px solid var(--accent);
}

h3 {
    color: var(--primary);
    margin: 15px 0 10px;
}

ul, ol {
    padding-left: 20px;
    margin-bottom: 15px;
}

li {
    margin-bottom: 8px;
}

.navigation {
    display: flex;
    justify-content: space-between;
    padding: 15px 20px;
    background-color: #f8f9fa;
    border-top: 1px solid #e9ecef;
}

button {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
}

button:hover {
    background-color: var(--secondary);
}

button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

.quiz-container {
    background-color: #f8f9fa;
    border-radius: 5px;
    padding: 15px;
    margin: 20px 0;
}

.question {
    margin-bottom: 15px;
}

.options label {
    display: block;
    padding: 8px 10px;
    margin: 5px 0;
    background-color: white;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
}

.options label:hover {
    background-color: #f0f0f0;
}

.feedback {
    margin-top: 15px;
    padding: 10px;
    border-radius: 5px;
    display: none;
}

.feedback.correct {
    background-color: #d4edda;
    color: #155724;
    display: block;
}

.feedback.incorrect {
    background-color: #f8d7da;
    color: #721c24;
    display: block;
}

.results {
    text-align: center;
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

.results h2 {
    color: var(--primary);
    margin: 20px 0;
}

.results p {
    margin: 15px 0;
    line-height: 1.6;
}

#certificate {
    background-color: var(--light-bg);
    padding: 20px;
    border-radius: 10px;
    margin: 20px 0;
    text-align: left;
}

#certificate ul {
    margin: 15px 0;
    padding-left: 20px;
}

#certificate li {
    margin: 10px 0;
    line-height: 1.4;
}

.score {
    font-size: 1.5em;
    font-weight: bold;
    margin: 15px 0;
}

.restart-btn {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 20px;
    transition: background-color 0.3s ease;
}

.restart-btn:hover {
    background-color: var(--secondary);
}

.exam-container {
    display: none;
    padding: 20px;
}

.exam-container.active {
    display: block;
}

.exam-question {
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e9ecef;
}

.diagram {
    max-width: 100%;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin: 15px 0;
    padding: 10px;
    background-color: white;
    text-align: center;
}

.diagram svg {
    max-width: 100%;
    height: auto;
}

.highlight {
    background-color: #fff3cd;
    padding: 2px 4px;
    font-weight: bold;
    border-radius: 3px;
}

.final-score-container {
    text-align: center;
    margin: 20px 0;
    padding: 20px;
    background-color: var(--light-bg);
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.final-score-container .score {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary);
    margin: 0;
    padding: 10px;
}