:root {
    --bg-color-primary: #f8f8f8;
    --bg-color-secondary: #ffffff;
    --text-color-primary: #333;
    --text-color-secondary: #666;
    --border-color: #e0e0e0;
    --accent-color: #007bff;
    --button-bg-color: #007bff;
    --button-text-color: #ffffff;
    --button-hover-bg: #0056b3;
    --editor-bg: #282c34; /* Dark background for code */
    --editor-text: #abb2bf; /* Light text for code */
    --tab-inactive-bg: #e9ecef;
    --tab-active-bg: #ffffff;
    --tab-border: #dee2e6;
}

body.dark-mode {
    --bg-color-primary: #2c2c2c;
    --bg-color-secondary: #3c3c3c;
    --text-color-primary: #e0e0e0;
    --text-color-secondary: #b0b0b0;
    --border-color: #555;
    --accent-color: #61afef;
    --button-bg-color: #61afef;
    --button-text-color: #2c2c2c;
    --button-hover-bg: #528cbf;
    --editor-bg: #1e1e1e;
    --editor-text: #d4d4d4;
    --tab-inactive-bg: #495057;
    --tab-active-bg: #2c2c2c;
    --tab-border: #6c757d;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color-primary);
    color: var(--text-color-primary);
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background-color: var(--bg-color-secondary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

header h1 {
    font-size: 1.8em;
    color: var(--accent-color);
}

.controls {
    display: flex;
    gap: 10px;
}

button, .upload-button {
    padding: 10px 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.2s ease, color 0.2s ease;
    background-color: var(--button-bg-color);
    color: var(--button-text-color);
    text-decoration: none; /* For label acting as button */
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

button:hover, .upload-button:hover {
    background-color: var(--button-hover-bg);
}

#upload-assets-input {
    display: none; /* Hide the default file input */
}

.main-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.editor-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
    background-color: var(--editor-bg);
}

.editor-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.editor-tabs button {
    flex: 1;
    padding: 10px 15px;
    border: none;
    border-right: 1px solid var(--border-color);
    background-color: var(--tab-inactive-bg);
    color: var(--text-color-secondary);
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s ease;
    border-radius: 0; /* Remove button border-radius */
}

.editor-tabs button:last-child {
    border-right: none;
}

.editor-tabs button.active {
    background-color: var(--tab-active-bg);
    color: var(--accent-color);
    border-bottom: 2px solid var(--accent-color);
}

.editor-panels {
    flex: 1;
    position: relative;
    overflow: hidden;
}

textarea {
    width: 100%;
    height: 100%;
    border: none;
    outline: none;
    padding: 15px;
    font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    font-size: 1em;
    line-height: 1.5;
    resize: none;
    background-color: var(--editor-bg);
    color: var(--editor-text);
    white-space: pre;
    word-wrap: normal;
    overflow: auto;
    position: absolute;
    top: 0;
    left: 0;
    display: none; /* Hidden by default, JS toggles active */
}

textarea.active,
.visual-panel.active {
    display: block;
}

.visual-panel {
    width: 100%;
    height: 100%;
    border: none;
    outline: none;
    padding: 15px;
    background-color: var(--editor-bg);
    color: var(--editor-text);
    overflow: auto;
    position: absolute;
    top: 0;
    left: 0;
    display: none; /* Hidden by default */
}

.visual-panel h2 {
    color: var(--accent-color);
    margin-bottom: 10px;
}

.visual-panel p {
    color: var(--text-color-secondary);
    margin-bottom: 20px;
}

.element-palette {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.add-element-btn {
    padding: 12px 20px;
    background-color: var(--button-bg-color);
    color: var(--button-text-color);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.95em;
    transition: background-color 0.2s ease;
}

.add-element-btn:hover {
    background-color: var(--button-hover-bg);
}

.preview-section {
    flex: 1;
    background-color: var(--bg-color-secondary);
    display: flex;
    flex-direction: column; /* Changed to column to stack controls and frame */
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative; /* Added for positioning the overlay */
}

.preview-controls {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 10px;
    width: 100%; /* Make controls take full width */
    background-color: var(--bg-color-secondary);
    border-bottom: 1px solid var(--border-color);
}

#preview-frame {
    width: 100%;
    height: 100%;
    border: none;
    background-color: #ffffff; /* Default for preview content */
}

body.dark-mode #preview-frame {
    background-color: #333; /* Darker default for preview content in dark mode */
}

#preview-drop-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 123, 255, 0.3); /* Semi-transparent blue overlay */
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5em;
    font-weight: bold;
    border: 2px dashed var(--accent-color);
    pointer-events: none; /* Allow events to pass through when not active */
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 100; /* Ensure it's above the iframe */
}

#preview-drop-overlay.active {
    opacity: 1;
    pointer-events: auto; /* Enable pointer events when active */
}

#preview-drop-overlay.drag-over {
    background-color: rgba(0, 123, 255, 0.5); /* Darker on hover */
    border-color: white;
}

/* --- Modal Styles --- */
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1000; /* 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 */
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: var(--bg-color-secondary);
    margin: 5% auto; /* Adjusted margin for better vertical spacing */
    padding: 30px 40px; /* Increased padding */
    border: 1px solid var(--border-color);
    border-radius: 8px;
    width: 90%; /* Increased width for more content space */
    max-width: 800px; /* Increased max-width */
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    position: relative;
    color: var(--text-color-primary);
    max-height: 90vh; /* Limit height to prevent overflow on small screens */
    overflow-y: auto; /* Enable vertical scrolling */
}

.modal-content h2 {
    color: var(--accent-color);
    margin-bottom: 25px; /* Increased margin */
    font-size: 2em; /* Slightly larger heading */
    text-align: center;
    border-bottom: 1px solid var(--border-color); /* Add a subtle separator */
    padding-bottom: 15px;
}

.modal-content h3 {
    color: var(--text-color-primary);
    margin-top: 30px; /* Increased margin */
    margin-bottom: 15px; /* Increased margin */
    font-size: 1.5em; /* Slightly larger subheading */
    border-bottom: 1px dashed var(--border-color); /* Dashed separator */
    padding-bottom: 8px;
}

.modal-content ul {
    list-style: disc; 
    margin-left: 25px;
    margin-bottom: 20px; /* Increased margin */
    padding: 0; /* Ensure no extra padding */
}

.modal-content ul.key-list {
    list-style: disc; /* Use bullets for these lists */
    margin-left: 25px;
    margin-bottom: 20px; /* Add more space below the list */
    color: var(--text-color-primary); /* Ensure consistent text color */
}

.modal-content ul.key-list li {
    margin-bottom: 10px; /* Increased spacing between list items */
    padding: 8px 0; /* Add more padding for readability */
    line-height: 1.6;
    border-bottom: 1px dotted var(--border-color); /* Dotted separator for list items */
    transition: background-color 0.2s ease;
}

.modal-content ul.key-list li:last-child {
    border-bottom: none; /* No border for the last item */
}

.modal-content ul.key-list li:hover {
    background-color: var(--tab-inactive-bg); /* Highlight on hover */
}

.modal-content ul.key-list li code {
    background-color: var(--editor-bg);
    color: var(--editor-text);
    padding: 4px 8px; /* Increased padding for code snippets */
    border-radius: 4px; /* Slightly larger border-radius */
    font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    font-size: 0.95em; /* Slightly larger font size */
    word-break: break-word; /* Ensure long code snippets wrap */
}

.modal-content p {
    margin-top: 20px; /* Increased margin */
    line-height: 1.7;
}

.close-button {
    color: var(--text-color-secondary);
    position: absolute;
    top: 15px;
    right: 25px;
    font-size: 30px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.2s ease;
}

.close-button:hover,
.close-button:focus {
    color: var(--accent-color);
    text-decoration: none;
    cursor: pointer;
}

/* Styles for FlexAssets Tab */
.assets-panel {
    width: 100%;
    height: 100%;
    border: none;
    outline: none;
    padding: 15px;
    background-color: var(--editor-bg);
    color: var(--editor-text);
    overflow: auto;
    position: absolute;
    top: 0;
    left: 0;
    display: none; /* Hidden by default */
}

.assets-panel.active {
    display: block;
}

.assets-panel h2 {
    color: var(--accent-color);
    margin-bottom: 10px;
}

.assets-panel p {
    color: var(--text-color-secondary);
    margin-bottom: 20px;
}

.asset-list {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    padding: 10px;
    border: 1px dashed var(--border-color);
    border-radius: 8px;
    min-height: 150px;
    justify-content: flex-start;
    align-items: flex-start;
}

.asset-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--bg-color-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    width: 120px; /* Fixed width for consistent display */
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    cursor: grab;
    transition: transform 0.1s ease-in-out, box-shadow 0.2s ease;
    position: relative;
}

body.dark-mode .asset-item {
    background-color: var(--tab-inactive-bg);
}

.asset-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.asset-item img, .asset-item video, .asset-item audio {
    max-width: 100%;
    height: auto;
    max-height: 80px; /* Limit height for thumbnails */
    border-radius: 4px;
    margin-bottom: 8px;
    object-fit: contain; /* Ensure content fits without cropping */
}

.asset-item .file-icon {
    font-size: 3em;
    margin-bottom: 8px;
    color: var(--accent-color);
}

.asset-item p {
    font-size: 0.8em;
    word-break: break-all; /* Break long file names */
    margin: 0;
    line-height: 1.2;
    color: var(--text-color-primary);
}

.asset-item .delete-asset-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    background: rgba(255, 0, 0, 0.7);
    color: white;
    border: none;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    font-size: 0.8em;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    transition: background-color 0.2s ease;
}

.asset-item .delete-asset-btn:hover {
    background: rgba(255, 0, 0, 0.9);
}

/* New: Highlight for active drop target */
.html-editor-active-drop {
    border: 2px dashed var(--accent-color);
    box-shadow: 0 0 10px var(--accent-color);
}