:root {
    --bg-color: #f4f4f4;
    --container-bg: #fff;
    --text-color: #333;
    --border-color: #ccc;
    --input-bg: #fff;
    --input-border: #ddd;
    --button-bg: #007bff;
    --button-text: #fff;
    --button-hover-bg: #0056b3;
    --fieldset-border: #ccc;
    --legend-text: #333;
    --disabled-bg: #ccc;
    --preview-area-bg: #eee;
    --header-text-color: #333;
    --accent-color: #007bff;
    --drag-over-bg: #e0eaff;
    /* For drop zone indication */
}

body.dark-mode {
    --bg-color: #2c2c2c;
    --container-bg: #383838;
    --text-color: #e0e0e0;
    --border-color: #555;
    --input-bg: #444;
    --input-border: #555;
    --button-bg: #0059b3;
    --button-text: #e0e0e0;
    --button-hover-bg: #004488;
    --fieldset-border: #555;
    --legend-text: #e0e0e0;
    --disabled-bg: #505050;
    --preview-area-bg: #4a4a4a;
    --header-text-color: #e0e0e0;
    --accent-color: #008cff;
    --drag-over-bg: #3a4a6a;
    /* For drop zone indication in dark mode */
}

body {
    font-family: sans-serif;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    padding: 20px;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background-color: var(--container-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 95%;
    max-width: 1200px;
    transition: background-color 0.3s;
}

.header-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.header-controls h1 {
    margin: 0;
    color: var(--header-text-color);
    font-size: 1.8em;
    /* Slightly larger title */
}

.theme-switcher {
    display: flex;
    align-items: center;
}

.theme-switcher label {
    margin-right: 8px;
    font-size: 0.9em;
}

#theme-toggle {
    cursor: pointer;
}

h1,
h2 {
    text-align: center;
    color: var(--text-color);
}

h2 {
    margin-bottom: 0.5em;
    /* More space below H2 */
}

.main-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 20px;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

@media (min-width: 992px) {
    .main-content {
        flex-direction: row;
    }

    .controls {
        flex: 1;
        max-width: 420px;
        /* Slightly wider for more controls */
    }

    .preview-section {
        flex: 2;
    }
}

fieldset {
    border: 1px solid var(--fieldset-border);
    border-radius: 4px;
    padding: 15px;
    transition: border-color 0.3s;
    margin-bottom: 10px;
    /* Add some margin between fieldsets */
}

legend {
    font-weight: bold;
    padding: 0 10px;
    /* More padding for legend */
    color: var(--legend-text);
    transition: color 0.3s;
}

label {
    display: block;
    margin-top: 10px;
    margin-bottom: 5px;
    font-weight: 500;
    /* Slightly bolder labels */
}

input[type="color"],
input[type="number"],
input[type="range"],
input[type="text"],
select,
button {
    padding: 10px;
    /* Slightly more padding */
    margin-top: 5px;
    border-radius: 4px;
    border: 1px solid var(--input-border);
    box-sizing: border-box;
    font-size: 1em;
    background-color: var(--input-bg);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

input[type="number"],
input[type="text"],
select {
    width: 100%;
}

input[type="range"] {
    width: 100%;
    padding: 0;
    /* Range inputs often need specific padding reset */
}

#gradient-angle-slider,
#blotchiness-slider,
#grain-opacity {
    margin-top: 8px;
    height: 20px;
    /* Make sliders a bit taller */
}

input[type="color"] {
    width: 50px;
    height: 35px;
    padding: 2px;
    vertical-align: middle;
    border-width: 2px;
    border-style: solid;
    border-color: transparent;
    /* Default transparent border */
    cursor: grab;
    /* Indicate draggable */
    transition: border-color 0.2s, box-shadow 0.2s, opacity 0.2s;
}

input[type="color"]:active {
    cursor: grabbing;
}

input[type="color"].color-picker-selected {
    border-color: var(--accent-color);
    box-shadow: 0 0 8px var(--accent-color);
    /* Enhanced shadow */
}

input[type="color"].dragging {
    /* Style for the item being dragged */
    opacity: 0.4;
    border-style: dashed;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.color-inputs-container {
    /* Container for color pickers */
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 10px;
    padding: 8px;
    /* Padding to make it a better drop target */
    border: 2px dashed transparent;
    min-height: 50px;
    /* Ensure it has some height even when empty */
    border-radius: 4px;
    transition: background-color 0.2s, border-color 0.2s;
}

.color-inputs-container.drag-over {
    /* Style when dragging over the container */
    border-color: var(--accent-color);
    background-color: var(--drag-over-bg);
}

.add-hex-group {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    /* More space */
    align-items: center;
}

.add-hex-group input[type="text"] {
    flex-grow: 1;
}

#edit-selected-color-fieldset input[type="text"] {
    margin-bottom: 8px;
}

button {
    background-color: var(--button-bg);
    color: var(--button-text);
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-weight: 500;
}

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

button:disabled {
    background-color: var(--disabled-bg);
    color: var(--text-color);
    opacity: 0.6;
    /* Slightly more visible when disabled */
    cursor: not-allowed;
}

.preview-section h2 {
    margin-top: 0;
}

#preview-area {
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: var(--preview-area-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    position: relative;
    overflow: hidden;
    transition: background-color 0.3s, border-color 0.3s;
}

#preview-canvas {
    display: block;
    width: 100%;
    height: 100%;
}

#download-btn {
    display: block;
    width: 100%;
    padding: 15px;
    font-size: 1.2em;
    background-color: #28a745;
    color: white;
    margin-top: 20px;
    /* Add some space above download button */
}

#download-btn:hover {
    background-color: #1e7e34;
}