* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
    padding: 30px;
    text-align: center;
    margin: auto;
}

h1 {
    color: #333;
    margin-bottom: 20px;
}

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

#progress-text {
    text-align: center;
    font-weight: bold;
    margin-bottom: 10px;
    color: #555;
}

.progress-bar {
    height: 10px;
    background-color: #eaeaea;
    border-radius: 5px;
    overflow: hidden;
}

#progress-fill {
    height: 100%;
    background-color: #4caf50;
    width: 0;
    transition: width 0.3s ease;
}

#question-container {
    margin-bottom: 20px;
}

#question {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px;
    color: #333;
}

#answer-input {
    width: 80%;
    padding: 12px 15px;
    font-size: 18px;
    border: 2px solid #ddd;
    border-radius: 5px;
    margin-bottom: 15px;
    text-align: center;
}

#answer-input:focus {
    border-color: #4caf50;
    outline: none;
}

button {
    background-color: #4caf50;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #3e8e41;
}

#next-btn, #restart-btn {
    background-color: #2196f3;
}

#next-btn:hover, #restart-btn:hover {
    background-color: #0b7dda;
}

#result-container {
    padding: 20px;
    border-radius: 5px;
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#result-container.hidden {
    display: none;
}

#result-icon {
    font-size: 48px;
    margin-bottom: 10px;
}

.correct #result-icon::after {
    content: '✓';
    color: #4caf50;
}

.incorrect #result-icon::after {
    content: '✗';
    color: #f44336;
}

#result-text {
    font-size: 18px;
    margin-bottom: 15px;
}

.hidden {
    display: none;
}

#summary-container {
    text-align: center;
}

#summary-container h2 {
    margin-bottom: 20px;
    color: #333;
}

#summary-container p {
    font-size: 20px;
    margin-bottom: 20px;
    color: #555;
}

#final-score {
    font-weight: bold;
    color: #2196f3;
}