/* General Styles */
body {
    font-family: 'Lato', sans-serif; /* Changed font to Lato */
    margin: 0;
    padding: 0;
    background-color: #000000; 
    color: #e0e0e0; /* Light text */
    display: flex;
    flex-direction: column; /* Stack children vertically */
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    text-align: center;
}

#app-container {
    background-color: #1e1e1e; /* Slightly lighter dark for container */
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
    width: 90%;
    max-width: 900px;
}

.screen {
    padding: 20px;
}

h1, h2 {
    color: #ffffff;
}

p {
    line-height: 1.6;
    margin-bottom: 15px;
}

button {
    background-color: #333333;
    color: white;
    border: 1px solid #555555;
    padding: 10px 20px;
    font-size: 1em;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin: 5px;
}

button:hover {
    background-color: #555555;
}

button:active {
    background-color: #222222;
}

canvas {
    background-color: #101010;
    border: 1px solid #444444;
    display: block;
    margin: 20px auto;
}

/* Screen Specific Styles */
#start-screen p {
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.controls {
    margin-top: 20px;
}

/* Legend and Plot Area */
#legend-controls fieldset {
    border: 1px solid #444444;
    border-radius: 5px;
    padding: 10px;
    margin-bottom: 20px;
    background-color: #2a2a2a;
}

#legend-controls legend {
    color: #ffffff;
    font-weight: bold;
    padding: 0 5px;
}

#legend-controls label {
    margin-right: 15px;
    color: #c0c0c0;
}

#plot-container {
    margin-top: 20px;
    position: relative; /* Added for better control over child elements if needed */
    height: 500px;    /* You can adjust this value as needed */
    width: 100%;      /* Ensures it takes the full width of its parent */
}

/* Pop-up Styles */
.popup {
    position: fixed; /* Or absolute if you prefer it within the app container */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7); /* Dim background */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000; /* Ensure it's on top */
}

.popup-content {
    background-color: #2c2c2c;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.5);
    width: 80%;
    max-width: 500px;
    text-align: left;
}

.popup-content h3 {
    margin-top: 0;
    color: #ffffff;
}

.popup-content p {
    color: #d0d0d0;
}

#close-popup-btn {
    display: block;
    margin-top: 20px;
    margin-left: auto;
    margin-right: 0;
}

/* Page Navigation Styles */
.page-navigation {
    width: 100%; /* Make it full width to center its content */
    padding: 20px 0; /* Add some padding above and below */
    text-align: center; /* Center the buttons within the div */
    margin-top: 20px; /* Add some space above the navigation */
}

.page-navigation button {
    /* Styles for navigation buttons, can be same as other buttons or specific */
    background-color: #333333;
    color: white;
    border: 1px solid #555555;
    padding: 10px 20px;
    font-size: 1em;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin: 5px 10px; /* Adjust margin for spacing between buttons */
}

.page-navigation button:hover {
    background-color: #555555;
}

.page-navigation button:active {
    background-color: #222222;
}