:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-panel: #1a1a1a;
    --border-color: #2a2a2a;
    --text-primary: #e5e5e5;
    --text-secondary: #999;
    --accent: #6d9fff;
    --accent-hover: #5a8ae6;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

.app {
    display: flex;
    height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
    width: 320px;
    min-width: 320px;
    background: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.sidebar-header {
    padding: 16px 16px 12px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h1 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.5px;
    margin-bottom: 2px;
}

.byline {
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.filename-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.unsaved-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
    opacity: 0;
    transition: opacity 0.2s;
}

.unsaved-dot.visible {
    opacity: 1;
}

.filename-input {
    background: transparent;
    border: none;
    border-bottom: 1px dashed var(--border-color);
    color: var(--text-secondary);
    font-size: 13px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    padding: 2px 0;
    outline: none;
    width: 100%;
    min-width: 0;
    transition: border-color 0.2s, color 0.2s;
}

.filename-input:hover {
    border-bottom-style: solid;
    border-bottom-color: #444;
}

.filename-input:focus {
    color: var(--text-primary);
    border-bottom-style: solid;
    border-bottom-color: var(--accent);
}

/* --- Toolbar --- */
.toolbar {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toolbar .pattern-select {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 12px;
    padding: 6px 8px;
    outline: none;
    cursor: pointer;
    transition: border-color 0.2s;
}

.toolbar .pattern-select:focus {
    border-color: var(--accent);
}

.toolbar-divider {
    border-top: 3px solid #555;
}

.toolbar-row {
    display: flex;
    gap: 8px;
}

.toolbar-row button,
.toolbar .btn-toolbar {
    flex: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: #9B9B9B;
    font-size: 12px;
    padding: 6px 8px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.toolbar-row button:hover,
.toolbar .btn-toolbar:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.btn-export {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: #9B9B9B;
    font-size: 12px;
    padding: 6px 8px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.btn-export:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

/* --- Scrollable area --- */
.sidebar-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 12px 12px 20px;
}

.sidebar-scroll::-webkit-scrollbar {
    width: 6px;
}

.sidebar-scroll::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-scroll::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

/* --- Group Headers --- */
.group-header {
    margin-top: 16px;
    margin-bottom: 8px;
    padding: 0 4px;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.group-header:first-child {
    margin-top: 0;
}

.group-header.blue { color: #7BA3CF; }
.group-header.amber { color: #C9A84C; }
.group-header.green { color: #7BAF7B; }
.group-header.gray { color: #9B9B9B; }

/* --- Collapsible Sections --- */
details.section {
    margin-bottom: 6px;
}

details.section > summary {
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--accent);
    padding: 6px 10px;
    background: var(--bg-secondary);
    border-radius: 4px;
    list-style: none;
    transition: background 0.15s;
    user-select: none;
}

details.section > summary::-webkit-details-marker {
    display: none;
}

details.section > summary::before {
    display: none;
}

details.section > summary:hover {
    background: var(--border-color);
}

.section-content {
    padding: 10px 12px 6px;
    margin-left: 8px;
    border-left: 2px solid var(--border-color);
}

/* --- Slider Rows --- */
.slider-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.slider-row label {
    font-size: 13px;
    color: var(--text-secondary);
    width: 100px;
    flex-shrink: 0;
    white-space: nowrap;
}

.slider-row input[type="range"] {
    flex: 1;
    min-width: 0;
}

.slider-row .value {
    font-size: 12px;
    color: var(--text-secondary);
    width: 36px;
    text-align: right;
    flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}

/* --- Range inputs --- */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

/* --- Select/Dropdown in controls --- */
.control-select {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: #9B9B9B;
    font-size: 12px;
    padding: 5px 8px;
    outline: none;
    cursor: pointer;
    margin-bottom: 8px;
    transition: border-color 0.2s;
}

.control-select:focus {
    border-color: var(--accent);
}

/* --- Select row (label + select inline) --- */
.select-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.select-row label {
    font-size: 13px;
    color: var(--text-secondary);
    width: 100px;
    flex-shrink: 0;
}

.select-row select {
    flex: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: #9B9B9B;
    font-size: 12px;
    padding: 5px 8px;
    outline: none;
    cursor: pointer;
    transition: border-color 0.2s;
}

.select-row select:focus {
    border-color: var(--accent);
}

/* --- Color controls --- */
.color-row {
    display: flex;
    align-items: center;
    gap: 6px;
    justify-content: center;
    margin-bottom: 6px;
}

.color-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.color-row input[type="color"] {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-radius: 3px;
    background: none;
    cursor: pointer;
    padding: 0;
}

.color-row input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-row input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 1px;
}

.btn-swap {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
    font-size: 16px;
    cursor: pointer;
    padding: 2px 5px;
    line-height: 1;
    transition: color 0.15s, border-color 0.15s;
}

.btn-swap:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.color-hex-row {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.hex-input {
    width: 80px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: monospace;
    font-size: 12px;
    padding: 3px 6px;
    text-align: center;
    outline: none;
    transition: border-color 0.2s;
}

.hex-input:focus {
    border-color: var(--accent);
}

/* --- Seed --- */
.seed-row {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 8px;
}

.seed-row label {
    font-size: 13px;
    color: var(--text-secondary);
    width: 100px;
    flex-shrink: 0;
}

.seed-input {
    flex: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: monospace;
    font-size: 13px;
    padding: 5px 8px;
    outline: none;
    min-width: 0;
    transition: border-color 0.2s;
}

.seed-input:focus {
    border-color: var(--accent);
}

.btn-small {
    padding: 5px 10px;
    font-size: 12px;
    white-space: nowrap;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: #9B9B9B;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.btn-small:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

/* --- Dimensions --- */
.transform-row {
    display: flex;
    gap: 6px;
    margin-bottom: 8px;
}

.btn-rotate {
    flex: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: #9B9B9B;
    font-size: 11px;
    cursor: pointer;
    padding: 4px 6px;
    transition: color 0.15s, background 0.15s;
}

.btn-rotate:hover {
    color: var(--text-primary);
    background: var(--border-color);
}

/* --- Toggle Switch --- */
.toggle-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.toggle-row label {
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
}

.toggle-switch {
    position: relative;
    width: 32px;
    height: 16px;
    flex-shrink: 0;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.toggle-track {
    position: absolute;
    inset: 0;
    background: var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

.toggle-track::after {
    content: "";
    position: absolute;
    top: 2px;
    left: 2px;
    width: 12px;
    height: 12px;
    background: white;
    border-radius: 50%;
    transition: transform 0.2s;
}

.toggle-switch input:checked + .toggle-track {
    background: var(--accent);
}

.toggle-switch input:checked + .toggle-track::after {
    transform: translateX(16px);
}

/* --- Pattern controls container --- */
.pattern-controls {
    display: flex;
    flex-direction: column;
}

/* --- Canvas --- */
.canvas-area {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    overflow: hidden;
    background: var(--bg-primary);
    cursor: grab;
}

.canvas-area.panning {
    cursor: grabbing;
    user-select: none;
}

#voronoi-svg {
    transform-origin: 0 0;
    flex-shrink: 0;
}

.svg-wrapper {
    flex-shrink: 0;
}