body {
    font-family: 'Nanum Gothic', sans-serif;
    margin: 0;
    background-color: #f8f8f8;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.main-header {
    text-align: center;
    background-color: #f0f0f0;
    width: 100%;
    padding: 20px;
    border-radius: 5px;
    margin-bottom: 20px;
}

.logo-text {
    font-size: 36px;
    font-weight: bold;
    color: #444;
}

.main-title {
    font-size: 28px;
    color: #FF6600;
    margin-top: 10px;
    margin-bottom: 10px;
}

.chalk-line {
    width: 100%;
    height: 5px;
    background-color: #4CAF50;
    margin: 0 auto;
}

.content {
    display: flex;
    justify-content: space-between;
    width: 100%;
    margin-top: 20px;
}

.left-section, .right-section {
    width: 48%;
    background-color: #ffffff;
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.left-section h3 {
    font-size: 18px;
    margin-bottom: 10px;
    border-bottom: 1px solid #ddd;
    padding-bottom: 5px;
}

.quiz-box {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 10px;
}

.quiz-button {
    background-color: #e0e0e0;
    border: 1px solid #ddd;
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
    text-align: center;
    width: 100%;
}

.quiz-button:hover {
    background-color: #ccc;
}

.right-section form {
    display: flex;
    flex-direction: column;
}

.right-section label {
    margin-bottom: 5px;
}

.right-section input {
    padding: 5px;
    margin-bottom: 10px;
}

.right-section button {
    padding: 5px;
    margin-right: 5px;
    cursor: pointer;
}

.mission-box {
    display: flex;
    justify-content: space-between;
    width: 100%;
    margin-top: 20px;
}

.mission {
    width: 30%;
    background-color: #ffffff;
    padding: 10px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.mission h4 {
    font-size: 16px;
    margin-bottom: 10px;
}

.mission ul {
    list-style-type: none;
    padding: 0;
}

.mission li {
    margin-bottom: 5px;
}


.container {
    width: 100%;
    max-width: 800px;
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.problem-header {
    background-color: #4CAF50;
    color: #fff;
    padding: 20px;
    text-align: center;
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
}

.problem-header h1 {
    margin: 0;
    font-size: 24px;
}

.back-button {
    display: inline-block;
    margin-top: 10px;
    padding: 8px 12px;
    background-color: #ff6600;
    color: #ffffff;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.back-button:hover {
    background-color: #e05500;
}

.problem-content {
    padding: 20px;
}

.problem-card {
    background-color: #f9f9f9;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.problem-card h2 {
    margin-top: 0;
    font-size: 20px;
    color: #333;
}

.problem-card p {
    margin: 10px 0;
    line-height: 1.6;
    color: #555;
}
.signup-header {
    background-color: #4CAF50;
    color: #fff;
    padding: 20px;
    text-align: center;
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
}

.signup-content {
    padding: 20px;
}

.signup-form {
    display: flex;
    flex-direction: column;
}

.signup-form label {
    margin-bottom: 5px;
    font-weight: bold;
    color: #333;
}

.signup-form input {
    padding: 10px;
    margin-bottom: 15px;
    border-radius: 4px;
    border: 1px solid #ddd;
    font-size: 16px;
}

.signup-form button {
    padding: 10px;
    background-color: #4CAF50;
    color: #fff;
    border: none;
    cursor: pointer;
    border-radius: 4px;
    transition: background-color 0.3s;
    font-size: 16px;
}

.signup-form button:hover {
    background-color: #45a049;
}