body {
  font-family: Arial, sans-serif;
  padding: 20px;
  max-width: 800px;
  margin: auto;
  background-image: url('');
  background-size: cover;
  background-position: center;
  background-attachment: fixed; 
}

textarea {
  width: 100%;
  height: 80px;
  margin-bottom: 10px;
  padding: 10px;
}

select, input, button {
  display: block;
  margin: 5px 0;
  padding: 5px;
  width: 100%;
}

.layer {
  border: 1px solid #ccc;
  padding: 10px;
  margin: 10px 0;
}
#matrixDisplay {
  background: #f5f5f5;
  padding: 15px;
  border-radius: 5px;
}

#playfairMatrix {
  font-family: monospace;
  white-space: pre-wrap;
  margin: 10px 0;
}


/* General Enhancements */
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  padding: 20px;
  max-width: 700px; /* Slightly narrower */
  margin: 40px auto; /* More top/bottom margin */
  background-color: #f4f7f6;
  color: #333;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
}

h1 {
  text-align: center;
  color: #2c3e50;
  margin-bottom: 30px;
}

textarea {
  width: calc(100% - 22px); /* Adjust for padding */
  height: 100px; /* Slightly taller */
  margin-bottom: 15px;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 1rem;
  resize: vertical; /* Allow vertical resize */
  transition: border-color 0.3s ease;
}

textarea:focus {
  border-color: #3498db;
  outline: none;
}

label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
  color: #555;
}

select, input[type="text"] {
  /* display: block; */ /* Removed to allow inline elements */
  margin: 5px 0 15px 0; /* More bottom margin */
  padding: 10px;
  width: calc(100% - 22px); /* Adjust for padding */
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

select:focus, input[type="text"]:focus {
    border-color: #3498db;
    outline: none;
}

button {
  padding: 10px 15px;
  margin: 10px 5px 15px 0; /* Adjusted margin */
  border: none;
  border-radius: 4px;
  background-color: #3498db;
  color: white;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.1s ease;
}

button:hover {
  background-color: #2980b9;
}

button:active {
  transform: scale(0.98);
}

/* Mode Buttons Specific Styles */
.mode-buttons {
  display: flex; /* Arrange buttons side-by-side */
  margin-bottom: 20px; /* Space below buttons */
}

.mode-button {
  flex-grow: 1; /* Make buttons share space equally */
  margin: 0 5px; /* Add space between buttons */
  background-color: #bdc3c7; /* Default inactive color */
  color: #333;
}

.mode-button.active {
  background-color: #2ecc71; /* Active color (e.g., green) */
  color: white;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2) inset; /* Inset shadow for active state */
}

.mode-button:first-child {
  margin-left: 0;
}

.mode-button:last-child {
  margin-right: 0;
}

/* Key Input Area */
#keyInputDiv {
    margin-bottom: 15px;
}

#keyInputDiv label {
    display: inline-block; /* Keep label and input on same line if space */
    margin-right: 10px;
    vertical-align: middle;
}

#keyInputDiv input[type="text"] {
    width: calc(100% - 150px); /* Adjust width */
    display: inline-block;
    vertical-align: middle;
    margin-right: 10px;
    margin-bottom: 0; /* Remove bottom margin */
}

#keyInputDiv button {
    display: inline-block !important; /* Override default block */
    width: auto; /* Auto width for button */
    vertical-align: middle;
    margin-bottom: 0;
}

/* Checkbox Style */
label input[type="checkbox"] {
    margin-right: 8px;
    vertical-align: middle;
}

/* Layer Styles */
.layer {
  border: 1px solid #ddd;
  background-color: #fff;
  padding: 15px;
  margin: 15px 0;
  border-radius: 5px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.layer label {
    margin-bottom: 8px;
}

.layer select,
.layer input[type="text"] {
    margin-bottom: 10px;
}

.layerKeyDiv {
    margin-top: 10px;
}

.layerKeyDiv label {
    display: inline-block;
    margin-right: 5px;
    vertical-align: middle;
}

.layerKeyDiv input[type="text"] {
    width: calc(100% - 200px); /* Adjust */
    display: inline-block;
    vertical-align: middle;
    margin-right: 5px;
    margin-bottom: 0;
}

.layerKeyDiv button {
    display: inline-block !important;
    width: auto;
    vertical-align: middle;
    margin-bottom: 0;
    padding: 8px 12px; /* Smaller padding for layer buttons */
    font-size: 0.9rem;
}

/* Matrix Display */
#matrixDisplay {
  background: #e8f4fd;
  padding: 15px;
  border-radius: 5px;
  border: 1px solid #bde0fe;
  margin-top: 20px;
}

#matrixDisplay h3 {
    margin-top: 0;
    color: #1e4f7a;
}

#playfairMatrix {
  font-family: 'Courier New', Courier, monospace;
  white-space: pre-wrap;
  margin: 10px 0;
  background-color: #fff;
  padding: 10px;
  border-radius: 4px;
  border: 1px solid #ccc;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    body {
        margin: 20px auto;
        padding: 15px;
    }

    h1 {
        font-size: 1.5rem;
    }

    #keyInputDiv input[type="text"],
    .layerKeyDiv input[type="text"] {
        width: calc(100% - 130px); /* Adjust for smaller screens */
    }
}