body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background-color: #f5f5f5;
    max-width: 1200px;
}
.header {
    display: flex;
    align-items: center;
    max-width: 1200px;
    margin-bottom: 20px;
    position: relative;
    min-height: 40px;
}
.back-button {
    background: none;
    border: none;
    font-size: 24px;
    color: black;
    cursor: pointer;
    padding: 8px;
    margin-right: 15px;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: background-color 0.3s;
    position: absolute;
    left: 0;
}
.back-button:hover {
    background-color: #f0f0f0;
}
.note-panel {
    background-color: #e8f4fd;
    border: 1px solid #b3d7f7;
    border-radius: 6px;
    padding: 12px 16px;
    margin: 15px auto 20px auto;
    max-width: 1200px;
    font-size: 14px;
    color: #0066cc;
}
.note-panel a {
    color: #0066cc;
    text-decoration: none;
    font-weight: 500;
}
.note-panel a:hover {
    text-decoration: underline;
}
.container {
    max-width: 1400px;
    margin: 0 auto;
}
.panel {
    background-color: white;
    padding: 20px;
    max-width: 1200px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.panel h2 {
    margin-top: 0;
    color: #333;
}
.header h1 {
    flex: 1;
    text-align: center;
    margin: 0;
}
@media (max-width: 700px) {
    .panel {
        padding: 16px;
    }
}
.mode-selector {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
}
.mode-tab {
    width: 50%;
    padding: 12px 20px;
    text-align: center;
    background-color: #f0f0f0;
    border: 1px solid #ddd;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s, color 0.3s;
}
.mode-tab:hover {
    background-color: #e0e0e0;
}
.mode-tab.active {
    background-color: #007cba;
    color: white;
    border-color: #007cba;
}
.mode-content {
    margin-top: 15px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: #fafafa;
}