:root {
    --bg-color: #1e1e2e;
    --panel-bg: #252537;
    --text-color: #cdd6f4;
    --accent-color: #89b4fa;
    --accent-hover: #b4befe;
    --border-color: #45475a;
    --success-color: #a6e3a1;
    --danger-color: #f38ba8;
    --font-family: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    overflow: hidden;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.app-header {
    padding: 1rem 2rem;
    background-color: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
}

.app-header h1 {
    font-size: 1.2rem;
    font-weight: 600;
}

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

.sidebar {
    width: 300px;
    background-color: var(--panel-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
    overflow-y: auto;
}

.panel {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.panel:last-child {
    border-bottom: none;
}

.panel h2 {
    font-size: 1rem;
    color: var(--accent-color);
}

.content-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
    overflow: hidden;
}

.toolbar {
    display: flex;
    gap: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.grid-view {
    display: flex;
    flex-wrap: wrap;
    align-content: flex-start;
    gap: 1rem;
    overflow-y: auto;
    height: 100%;
    padding-right: 0.5rem;
}

/* Components */
.btn {
    padding: 0.6rem 1rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
    font-family: inherit;
}

.btn.primary {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

.btn.primary:hover {
    background-color: var(--accent-hover);
}

.btn.secondary {
    background-color: var(--border-color);
    color: var(--text-color);
}

.btn.secondary:hover {
    background-color: #585b70;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.control-group label {
    font-size: 0.9rem;
    color: #a6adc8;
}

select,
input[type="text"],
input[type="number"] {
    padding: 0.5rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    font-family: inherit;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.empty-state {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: #585b70;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #585b70;
}

/* Drag and Drop Visual Feedback */
.drag-over {
    border: 2px dashed var(--accent-color) !important;
    background-color: rgba(137, 180, 250, 0.1) !important;
    position: relative;
}

.drag-over::after {
    content: 'Drop file here';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--accent-color);
    font-size: 1.2rem;
    font-weight: 600;
    pointer-events: none;
    background-color: rgba(30, 30, 46, 0.8);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    z-index: 100;
}

/* Pre-processing UI */
.sub-group {
    margin-bottom: 10px;
    padding-left: 10px;
    border-left: 2px solid #eee;
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 5px;
}

.slider-row label {
    font-size: 0.85rem;
    width: 40px;
    /* Fixed width for labels */
    margin-bottom: 0;
}

.slider-row input[type="range"] {
    flex: 1;
}

.slider-row span {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.sidebar {
    width: 300px;
    background-color: var(--panel-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
    overflow-y: auto;
}

.panel {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.panel:last-child {
    border-bottom: none;
}

.panel h2 {
    font-size: 1rem;
    color: var(--accent-color);
}

.content-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
    overflow: hidden;
}

.toolbar {
    display: flex;
    gap: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.grid-view {
    display: flex;
    flex-wrap: wrap;
    align-content: flex-start;
    gap: 1rem;
    overflow-y: auto;
    height: 100%;
    padding-right: 0.5rem;
}

/* Components */
.btn {
    padding: 0.6rem 1rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
    font-family: inherit;
}

.btn.primary {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

.btn.primary:hover {
    background-color: var(--accent-hover);
}

.btn.secondary {
    background-color: var(--border-color);
    color: var(--text-color);
}

.btn.secondary:hover {
    background-color: #585b70;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.control-group label {
    font-size: 0.9rem;
    color: #a6adc8;
}

select,
input[type="text"],
input[type="number"] {
    padding: 0.5rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    font-family: inherit;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.empty-state {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: #585b70;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
}

#palette-list .empty-state {
    height: 100px !important;
    min-height: 100px;
    max-height: 100px;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #585b70;
}

/* Drag and Drop Visual Feedback */
.drag-over {
    border: 2px dashed var(--accent-color) !important;
    background-color: rgba(137, 180, 250, 0.1) !important;
    position: relative;
}

.drag-over::after {
    content: 'Drop file here';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--accent-color);
    font-size: 1.2rem;
    font-weight: 600;
    pointer-events: none;
    background-color: rgba(30, 30, 46, 0.8);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    z-index: 100;
}

/* Pre-processing UI */
.sub-group {
    margin-bottom: 10px;
    padding-left: 10px;
    border-left: 2px solid #eee;
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 5px;
}

.slider-row label {
    font-size: 0.85rem;
    width: 40px;
    /* Fixed width for labels */
    margin-bottom: 0;
}

.slider-row input[type="range"] {
    flex: 1;
}

.slider-row span {
    font-size: 0.8rem;
    width: 35px;
    text-align: right;
}

.btn.small {
    padding: 4px 8px;
    font-size: 0.8rem;
}

/* Collapsible Sections */
details {
    margin-bottom: 10px;
}

summary {
    cursor: pointer;
    user-select: none;
    outline: none;
    list-style: none;
    /* Remove default marker */
}

summary::-webkit-details-marker {
    display: none;
    /* Remove default marker in WebKit */
}

summary h4 {
    display: inline-block;
    margin: 0;
    font-size: 1rem;
    color: var(--text-color);
}

summary::after {
    content: '+';
    float: right;
    font-weight: bold;
    color: var(--text-color);
}

details[open] summary::after {
    content: '-';
}

details[open] .sub-group {
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}