body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: #eef1f5; /* Lighter business blue/gray */
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start; /* Align top */
    min-height: 100vh;
}

.container {
    background: #fff;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    max-width: 1200px; /* Increased max-width for two columns */
    width: 100%;
    margin-top: 30px;
}

h1 {
    text-align: center;
    color: #1a2b4d;
    font-weight: 600;
    margin-bottom: 0; /* Reset margin, header section handles spacing */
}

/* Header Section Layout */
.header-section {
    margin-bottom: 40px; /* Space below header */
    position: relative; /* Needed for absolute positioning of attribution */
    padding-top: 10px; /* Add padding to prevent overlap if title wraps */
    padding-bottom: 10px;
}

.header-attribution {
    position: absolute;
    right: 0;
    top: 50%; /* Vertically center relative to header section */
    transform: translateY(-50%);
    font-size: 0.9em;
    color: #777;
    text-align: right;
}

.header-attribution a {
    color: #555;
    text-decoration: none;
    font-weight: 500;
}

.header-attribution a:hover {
    text-decoration: underline;
    color: #333;
}

/* Main Layout */
.main-content-area {
    display: flex;
    gap: 40px; /* Gap between left and right panels */
}

.left-panel {
    flex: 1; /* Take up available space */
    min-width: 400px; /* Minimum width */
}

.right-panel {
    flex: 1; /* Take up available space */
    min-width: 400px; /* Minimum width */
    background-color: #f8f9fa; /* Optional: Slight background difference */
    padding: 30px;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

/* Adjustments for elements within panels */
.input-grid {
     grid-template-columns: 1fr; /* Change grid to single column in left panel */
     gap: 30px; /* Increased gap */
     margin-bottom: 30px;
}

#results,
#flow-diagram {
    margin-top: 0; /* Remove top margin as panel provides separation */
    padding-top: 0;
    border-top: none; /* Remove border as panel provides separation */
}

/* Flow Diagram Styles - Material UI Inspired (Reverted) + Grid Layout */
#flow-diagram {
    display: grid; /* Use Grid */
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); /* Responsive columns */
    gap: 30px 40px; /* Row and column gap */
    margin-top: 30px;
    padding: 35px 10px 25px 10px;
    border-top: 1px solid #e0e0e0;
    position: relative;
    align-items: stretch; /* Stretch items to fill grid cell height if needed */
}

#flow-diagram h2 {
    grid-column: 1 / -1; /* Make heading span all columns */
    text-align: center;
    margin-bottom: 40px;
    color: #555;
    font-weight: 500;
    font-size: 1.3em;
}

/* Reverted Material UI Step Styling */
.flow-step {
    background-color: #ffffff;
    border: none;
    border-radius: 4px;
    padding: 20px 25px;
    text-align: center;
    min-width: 130px;
    /* width: auto; */ /* Let grid handle width */
    box-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.1);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    transition: box-shadow 0.3s ease;
    cursor: help;
}

.flow-step:hover {
    box-shadow: 0 2px 5px rgba(0,0,0,0.15), 0 2px 4px rgba(0,0,0,0.15);
}

.flow-label {
    display: block;
    font-size: 0.85em;
    color: #616161;
    margin-bottom: 10px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.flow-value {
    display: block;
    font-size: 1.4em;
    font-weight: 500;
    color: #212121;
    line-height: 1.2;
    margin-bottom: 3px;
}

.flow-rate {
    font-size: 0.8em;
    color: #757575;
    display: block;
    margin-top: 8px;
}

/* Numbered Circles (Keep styling) */
.flow-number {
    position: absolute;
    top: -15px;
    right: -10px;
    background-color: #4CAF50;
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8em;
    font-weight: bold;
    line-height: 1;
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

/* Arrow Styling - Simplified for Grid */
.flow-arrow {
    /* Hide the complex line/arrowhead */
    background-color: transparent;
    height: auto;
    border: none;
    /* Use simple text arrow again, let grid gap provide space */
    font-size: 1.8em;
    color: #bdbdbd;
    padding: 0 10px;
    text-align: center;
    align-self: center;
    /* Remove pseudo-elements if they exist */
    /* content: none !important; */ 
}
.flow-arrow::after {
    content: none;
}

/* Specific styles for the Net Result Node container */
#net-result-node {
    display: flex; 
    align-items: center;
    /* Grid placement might need JS if dynamic based on count */
    /* For now, assumes it appears last */
    grid-column: span 2; /* Example: Make it span if needed */
    justify-self: center; /* Center it if it spans */
}

/* Error Styling */
.results-error #results p:first-child {
    background-color: #f8d7da;
    color: #721c24;
    border-color: #f5c6cb;
}
.results-error #results p:not(:first-child) {
    display: none; /* Hide other paragraphs on error */
}

.results-error #flow-diagram {
    opacity: 0.5; /* Dim flow diagram on error */
    pointer-events: none;
}

/* Potential MRR/ARR specific styling (optional) */
#potentialMRR, #potentialARR {
    font-style: italic;
    color: #555;
    background-color: #f0f0f0;
    border-color: #e0e0e0;
}

/* Expense Toggle Switch Styles */
.expense-toggle-section {
    display: flex;
    align-items: center;
    margin-top: 25px; /* Increased margin */
    padding: 15px 0;
    border-top: 1px solid #e0e0e0;
    border-bottom: 1px solid #e0e0e0;
}

.toggle-label {
    margin-left: 10px;
    color: #334e68;
    font-weight: 500;
    cursor: pointer;
}

.switch {
  position: relative;
  display: inline-block;
  width: 50px; /* Slightly smaller width */
  height: 24px; /* Slightly smaller height */
}

.switch input { 
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px; /* Smaller handle */
  width: 18px;  /* Smaller handle */
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
}

input:checked + .slider {
  background-color: #4a90e2; /* Business blue */
}

input:focus + .slider {
  box-shadow: 0 0 1px #4a90e2;
}

input:checked + .slider:before {
  transform: translateX(26px);
}

.slider.round {
  border-radius: 24px;
}

.slider.round:before {
  border-radius: 50%;
}

/* Expense Calculator Section */
#expense-calculator {
    margin-top: 30px; /* Increased margin */
    padding: 25px;
    background-color: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

#expense-calculator h2 {
     color: #1a2b4d;
    margin-bottom: 20px;
    font-weight: 600;
    font-size: 1.2em; /* Slightly smaller heading */
    border-bottom: 1px solid #dee2e6;
    padding-bottom: 10px;
}

#expense-items-list {
    margin-bottom: 20px;
}

.expense-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    padding: 10px;
    background-color: #fff;
    border-radius: 4px;
    border: 1px solid #dee2e6;
}

.expense-item input[type="text"],
.expense-item input[type="number"] {
    padding: 8px 10px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    font-size: 0.95em;
}

.expense-item input[type="text"] {
    flex-grow: 1; /* Allow name to take available space */
}

.expense-item input[type="number"] {
    width: 100px; /* Fixed width for cost */
    text-align: right;
}

.expense-item .remove-expense-btn {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    border-radius: 4px;
    padding: 5px 8px;
    cursor: pointer;
    font-size: 0.9em;
    line-height: 1;
}

.expense-item .remove-expense-btn:hover {
    background-color: #f5c6cb;
}

#add-expense-btn {
    background-color: #e2e6ea;
    color: #343a40;
    border: 1px solid #adb5bd;
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s ease;
    display: block; /* Make it block */
    margin-bottom: 20px; /* Add space below */
}

#add-expense-btn:hover {
    background-color: #ced4da;
}

/* Expense Adjustment Toggle Styles */
.expense-adjustment-toggle {
    display: flex;
    align-items: center;
    margin-top: 15px;
    margin-bottom: 20px;
    padding: 10px;
    background-color: #e9ecef; /* Slightly different background */
    border-radius: 4px;
}

.expense-adjustment-toggle .toggle-label {
    margin-left: 10px;
    flex-grow: 1; /* Allow label to push small text to the right */
}

.expense-adjustment-toggle small {
    font-size: 0.85em;
    color: #6c757d;
    cursor: help;
}
/* End Expense Adjustment Toggle */

.expense-summary {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px dashed #ced4da;
}

.expense-summary p {
    margin-bottom: 8px;
    font-size: 1em;
    color: #334e68;
    font-weight: 500;
}

.expense-summary span {
    font-weight: 600;
    color: #1a2b4d;
}

/* Churn Toggle and Input Styles */
.churn-toggle-section {
    display: flex;
    align-items: center;
    margin-top: 25px; /* Increased margin */
    padding-bottom: 20px;
}

#churn-input-group {
    margin-top: -10px;
    margin-bottom: 25px; /* Increased margin */
    padding-left: 60px;
}

.input-group input[type="number"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #ced4da;
    border-radius: 5px;
    box-sizing: border-box;
    font-size: 1em;
    transition: border-color 0.2s ease-in-out;
}

.input-group input[type="number"]:focus {
    border-color: #4a90e2; /* Highlight focus */
    outline: none;
}

.input-group small {
    display: block;
    margin-top: 6px;
    color: #6c757d; /* Gray */
    font-size: 0.85em;
}

/* Add transition for smoother appearance? */
}

.input-group input[type="number"] {
    width: 100%;
    padding: 12px;
}

/* Footer Styles */
/* footer {
    text-align: center;
    padding: 20px;
    margin-top: 30px;
    font-size: 0.9em;
    color: #777;
} */

/* footer a {
    color: #555;
    text-decoration: none;
    font-weight: 500;
} */

/* footer a:hover {
    text-decoration: underline;
    color: #333;
} */

/* Advanced Toggle Section */
.advanced-toggle-section {
    display: flex;
    align-items: center;
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
    gap: 10px; /* Add gap for spacing */
}

/* Beta Tag Style */
.beta-tag {
    font-size: 0.7em;
    font-weight: bold;
    color: #fff;
    background-color: #007bff; /* Blue */
    padding: 2px 6px;
    border-radius: 4px;
    text-transform: uppercase;
    vertical-align: middle; /* Align with text */
    margin-left: 5px; /* Space from label */
}

/* Advanced Features Section */
#advanced-features {
    margin-top: 20px;
    padding: 25px;
    background-color: #f0f4f8; /* Slightly different background */
    border-radius: 8px;
    border: 1px solid #d6dfe8;
}

#advanced-features h2 {
    color: #1a2b4d;
    margin-bottom: 20px;
    font-weight: 600;
    font-size: 1.2em;
    border-bottom: 1px solid #c0cde0;
    padding-bottom: 10px;
}

#advanced-features .input-group {
    margin-bottom: 25px; /* Spacing for CAC input */
}

.advanced-summary {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px dashed #c0cde0;
}

.advanced-summary p {
    margin-bottom: 12px;
    font-size: 0.95em;
    color: #334e68;
    cursor: help; /* Indicate tooltip */
}

.advanced-summary span {
    font-weight: 600;
    color: #1a2b4d;
    background-color: #e4eaf1;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: 5px;
}

/* Warning Message Style */
.warning-message {
    color: #d9534f; /* Bootstrap's danger color */
    font-weight: bold;
    margin-top: 10px;
    padding: 8px;
    background-color: #f2dede;
    border: 1px solid #ebccd1;
    border-radius: 4px;
    font-size: 0.9em;
    cursor: help; /* Indicate tooltip */
}

/* Help Button Styles */
.help-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: #007bff; /* Or another noticeable color */
    color: white;
    font-size: 1.8em;
    font-weight: bold;
    border: none;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    z-index: 1000;
    display: flex; /* Center the ? */
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.help-button:hover {
    background-color: #0056b3;
}

/* Help Modal Styles */
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1001; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgba(0,0,0,0.6); /* Black w/ opacity */
    padding-top: 50px; /* Location of the box */
}

.modal-content {
    background-color: #fefefe;
    margin: auto;
    padding: 30px;
    border: 1px solid #888;
    width: 80%;
    max-width: 700px; /* Max width */
    border-radius: 8px;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19);
    position: relative;
    max-height: 85vh; /* Limit height */
    overflow-y: auto; /* Enable vertical scrolling */
}

.close-help-button {
    color: #aaa;
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 28px;
    font-weight: bold;
    background: none;
    border: none;
    cursor: pointer;
    line-height: 1;
}

.close-help-button:hover,
.close-help-button:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

/* Manual Content Styling */
.modal-content h2 {
    margin-top: 0;
    color: #333;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

.modal-content h3 {
    margin-top: 20px;
    margin-bottom: 10px;
    color: #1a2b4d;
}

.modal-content ul {
    padding-left: 20px;
}

.modal-content li {
    margin-bottom: 10px;
    line-height: 1.5;
}

.modal-content li ul {
    margin-top: 5px;
    padding-left: 15px;
}

.modal-content strong {
     color: #0056b3;
}

/* Responsive Styles */
@media (max-width: 992px) { /* Adjustments for medium screens / tablets */
    .container {
        padding: 30px; /* Slightly reduce padding */
    }
    .main-content-area {
        gap: 30px; /* Reduce gap */
    }
    .left-panel, .right-panel {
        min-width: 300px; /* Reduce min-width */
    }
    #flow-diagram {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); /* Adjust minmax */
        gap: 25px 30px; /* Adjust gap */
    }
}

@media (max-width: 768px) { /* Adjustments for smaller screens / mobile */
    body {
        padding: 10px; /* Reduce body padding */
        align-items: flex-start; /* Align container to top */
    }
    .container {
        padding: 20px; /* Further reduce padding */
        margin-top: 15px; /* Reduce top margin */
    }
    h1 {
        font-size: 1.8em; /* Reduce heading size */
    }
    .header-section {
        margin-bottom: 25px; /* Reduce bottom margin */
        padding-top: 5px;
        padding-bottom: 5px;
    }
    .header-attribution {
        position: static; /* Unset absolute positioning */
        transform: none;
        text-align: center; /* Center attribution text */
        margin-top: 10px; /* Add some space */
        font-size: 0.8em;
    }
    .main-content-area {
        flex-direction: column; /* Stack panels vertically */
        gap: 30px; /* Adjust gap for vertical layout */
        align-items: center; /* Center the stacked panels horizontally */
    }
    .left-panel, .right-panel {
        min-width: 0; /* Remove min-width constraint */
        width: 90%; /* Use most of the width */
        max-width: 500px; /* But limit max width for centering */
        padding: 20px; /* Adjust panel padding */
    }
    .input-grid {
        gap: 20px; /* Reduce gap in input grid */
    }
    #flow-diagram {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); /* Smaller minmax */
        gap: 20px 20px; /* Reduce gaps */
        padding: 25px 5px 15px 5px; /* Adjust padding */
        margin-top: 20px;
    }
    #flow-diagram h2 {
        font-size: 1.1em; /* Reduce flow diagram heading */
        margin-bottom: 25px;
    }
    .flow-step {
        padding: 15px 10px; /* Adjust padding */
        min-width: 100px; /* Adjust min width */
    }
    .flow-value {
        font-size: 1.2em; /* Adjust font size */
    }
    .flow-arrow { /* Hide arrows on small screens if they cause layout issues */
       display: none;
    }
    #net-result-node {
        grid-column: 1 / -1; /* Make net result span full width */
        justify-self: center;
        margin-top: 10px; /* Add some space if stacked */
    }

    .expense-toggle-section, .churn-toggle-section, .advanced-toggle-section {
        flex-direction: column; /* Stack toggle elements */
        align-items: center; /* Align toggle items to center */
        padding: 10px 0;
    }
    /* Add margin below switch when stacked */
    .expense-toggle-section .switch,
    .churn-toggle-section .switch,
    .advanced-toggle-section .switch {
        margin-bottom: 8px;
    }
     #churn-input-group {
        margin-top: 10px; /* Add space after toggle */
        padding-left: 0; /* Align with toggles */
    }
    .expense-item {
        flex-direction: column; /* Stack expense item inputs */
        align-items: stretch; /* Stretch inputs */
        gap: 10px;
    }
    .expense-item input[type="text"] {
        flex-grow: 1; /* Allow text input to grow */
    }
    .expense-item input[type="number"] {
        width: 100px; /* Give number input a fixed width */
        align-self: flex-start; /* Align left */
    }
    .modal-content {
        width: 95%; /* Make modal wider on mobile */
        padding: 15px;
    }
    .close-help-button {
        top: 5px;
        right: 10px;
    }
    .help-button {
        right: 10px; /* Adjust position */
        bottom: 10px;
    }
}

@media (max-width: 480px) { /* Further adjustments for very small screens */
     h1 {
        font-size: 1.6em; /* Further reduce heading */
     }
    .container {
        padding: 15px; /* Further reduce padding */
    }
    .left-panel, .right-panel {
        padding: 20px; /* Increase panel padding for smallest screens */
        width: 100%; /* On very small screens, use full width again */
        max-width: none; /* Remove the max-width limit */
    }
    .input-group input[type="number"] {
        /* Ensure number inputs don't overflow */
         max-width: 100%;
         width: 100%; /* Make sure it still tries to fill */
         box-sizing: border-box; /* Include padding in width calculation */
    }
    .flow-step {
        padding: 10px 8px; /* Smaller padding */
        min-width: 90px;
    }
    #flow-diagram {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)); /* Smaller minmax */
        gap: 15px; /* Reduce gaps */
    }
    .expense-item {
        /* Already stacked, ensure button is okay */
        gap: 8px;
    }
    .expense-item input[type="number"] {
        width: 80px; /* Slightly smaller width */
    }
     .remove-expense-btn {
        padding: 6px 10px;
        font-size: 0.9em;
        align-self: center; /* Center remove button */
        margin-top: 5px;
     }
     .target-type-selector label {
        padding: 5px 8px; /* Adjust padding */
        font-size: 0.85em;
     }
     .target-type-selector input[type="radio"] {
        margin-right: 3px; /* Adjust spacing */
     }
    .modal-content {
        padding: 10px;
    }
}