:root {
    --bg-darkest: #1a1a1a;
    --bg-dark: #252525;
    --bg-medium: #2d2d2d;
    --bg-light: #3c3c3c;
    --bg-lighter: #4a4a4a;
    --text-primary: #e0e0e0;
    --text-secondary: #999;
    --text-dim: #666;
    --accent: #2680eb;
    --accent-hover: #4a9af5;
    --accent-active: #1a6ed8;
    --border: #444;
    --border-light: #555;
    --panel-bg: #2d2d2d;
    --input-bg: #1a1a1a;
    --hover-bg: #3a3a3a;
    --selected-bg: #2680eb33;
    --danger: #e04040;
    --scrollbar-thumb: #555;
    --scrollbar-track: #2d2d2d;
}

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

html, body {
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 12px;
    color: var(--text-primary);
    background: var(--bg-darkest);
    user-select: none;
    -webkit-user-select: none;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}
::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}

/* App Layout */
#app {
    display: grid;
    grid-template-rows: auto auto 1fr auto;
    height: 100vh;
    width: 100vw;
}

/* Menu Bar */
#menu-bar {
    display: flex;
    align-items: center;
    height: 28px;
    background: var(--bg-medium);
    border-bottom: 1px solid var(--border);
    padding: 0 4px;
    gap: 2px;
}

.menu-item {
    position: relative;
    padding: 4px 8px;
    cursor: pointer;
    border-radius: 3px;
    font-size: 12px;
    color: var(--text-primary);
}
.menu-item:hover, .menu-item.open {
    background: var(--hover-bg);
}

.menu-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--bg-medium);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 4px 0;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.menu-dropdown-item {
    display: flex;
    justify-content: space-between;
    padding: 5px 20px;
    cursor: pointer;
    color: var(--text-primary);
    white-space: nowrap;
}
.menu-dropdown-item:hover {
    background: var(--accent);
    color: white;
}
.menu-dropdown-item.disabled {
    color: var(--text-dim);
    pointer-events: none;
}
.menu-dropdown-item .shortcut {
    color: var(--text-secondary);
    margin-left: 30px;
    font-size: 11px;
}
.menu-dropdown-item:hover .shortcut {
    color: rgba(255,255,255,0.7);
}
.menu-separator {
    height: 1px;
    background: var(--border);
    margin: 4px 0;
}

/* Property Bar */
#property-bar {
    display: flex;
    align-items: center;
    height: 32px;
    background: var(--bg-dark);
    border-bottom: 1px solid var(--border);
    padding: 0 8px;
    gap: 12px;
    overflow-x: auto;
}

.prop-slider, .prop-select {
    display: flex;
    align-items: center;
    gap: 4px;
}
.prop-slider label, .prop-select label {
    color: var(--text-secondary);
    font-size: 11px;
    white-space: nowrap;
}
.prop-slider input[type="range"] {
    width: 80px;
    height: 4px;
    appearance: none;
    background: var(--bg-lighter);
    border-radius: 2px;
    cursor: pointer;
}
.prop-slider input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
}
.prop-value {
    color: var(--text-primary);
    font-size: 11px;
    min-width: 24px;
    text-align: right;
}
.prop-select select {
    background: var(--input-bg);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 3px;
    padding: 2px 4px;
    font-size: 11px;
    cursor: pointer;
}

/* Workspace */
#workspace {
    display: grid;
    grid-template-columns: 48px 1fr 260px;
    overflow: hidden;
}

/* Toolbar */
#toolbar {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--bg-dark);
    border-right: 1px solid var(--border);
    padding: 4px 0;
    gap: 2px;
    overflow-y: auto;
}

.tool-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 4px;
    font-size: 16px;
    position: relative;
}
.tool-btn:hover {
    background: var(--hover-bg);
}
.tool-btn.active {
    background: var(--accent);
    color: white;
}
.tool-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}
.tool-btn .shortcut-hint {
    position: absolute;
    bottom: 1px;
    right: 2px;
    font-size: 8px;
    color: var(--text-dim);
}
.tool-btn.active .shortcut-hint {
    color: rgba(255,255,255,0.6);
}
.tool-separator {
    width: 28px;
    height: 1px;
    background: var(--border);
    margin: 3px 0;
}

/* Canvas Container */
#canvas-container {
    position: relative;
    overflow: hidden;
    background: var(--bg-darkest);
    cursor: crosshair;
}

#canvas-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

#canvas-wrapper canvas {
    position: absolute;
    top: 0;
    left: 0;
    image-rendering: auto;
}

.checker-bg {
    background-image:
        linear-gradient(45deg, #404040 25%, transparent 25%),
        linear-gradient(-45deg, #404040 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #404040 75%),
        linear-gradient(-45deg, transparent 75%, #404040 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

/* Right Panels */
#panels-right {
    display: flex;
    flex-direction: column;
    background: var(--bg-dark);
    border-left: 1px solid var(--border);
    overflow-y: auto;
}

.panel {
    border-bottom: 1px solid var(--border);
}
.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 24px;
    padding: 0 8px;
    background: var(--bg-medium);
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
}
.panel-header:hover {
    color: var(--text-primary);
}
.panel-body {
    padding: 8px;
}
.panel.collapsed .panel-body {
    display: none;
}

/* Layer Panel */
.layer-list {
    display: flex;
    flex-direction: column;
    gap: 1px;
}
.layer-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 6px;
    background: var(--bg-dark);
    border-radius: 3px;
    cursor: pointer;
    min-height: 40px;
}
.layer-item:hover {
    background: var(--hover-bg);
}
.layer-item.active {
    background: var(--selected-bg);
    outline: 1px solid var(--accent);
}
.layer-item.drag-over {
    border-top: 2px solid var(--accent);
}
.layer-visibility {
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 14px;
    flex-shrink: 0;
}
.layer-visibility:hover {
    color: var(--text-primary);
}
.layer-visibility.hidden-layer {
    color: var(--text-dim);
}
.layer-thumbnail {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border);
    border-radius: 2px;
    background: white;
    flex-shrink: 0;
    image-rendering: auto;
}
.layer-name {
    flex: 1;
    font-size: 11px;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.layer-name input {
    background: var(--input-bg);
    border: 1px solid var(--accent);
    color: var(--text-primary);
    font-size: 11px;
    padding: 1px 3px;
    width: 100%;
    outline: none;
}
.layer-controls {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 0;
}
.layer-controls select {
    background: var(--input-bg);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 3px;
    font-size: 11px;
    padding: 2px;
}
.layer-controls input[type="range"] {
    width: 80px;
}
.layer-controls label {
    font-size: 10px;
    color: var(--text-secondary);
}
.layer-actions {
    display: flex;
    gap: 2px;
    padding: 4px 0;
    border-top: 1px solid var(--border);
}
.layer-action-btn {
    flex: 1;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 3px;
    font-size: 14px;
}
.layer-action-btn:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
}

/* Color Panel */
.color-picker-area {
    position: relative;
}
.sv-canvas {
    width: 100%;
    aspect-ratio: 1;
    border: 1px solid var(--border);
    border-radius: 3px;
    cursor: crosshair;
    display: block;
}
.hue-bar {
    width: 100%;
    height: 16px;
    border: 1px solid var(--border);
    border-radius: 3px;
    cursor: crosshair;
    margin-top: 6px;
    display: block;
}
.color-inputs {
    display: flex;
    gap: 4px;
    margin-top: 6px;
}
.color-inputs .color-field {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}
.color-inputs .color-field input {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 3px;
    color: var(--text-primary);
    font-size: 11px;
    padding: 2px 4px;
    text-align: center;
}
.color-inputs .color-field label {
    font-size: 9px;
    color: var(--text-dim);
}
.color-swatches {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
}
.swatch-pair {
    position: relative;
    width: 36px;
    height: 36px;
}
.swatch {
    position: absolute;
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-light);
    border-radius: 2px;
    cursor: pointer;
}
.swatch.foreground {
    top: 0;
    left: 0;
    z-index: 1;
}
.swatch.background {
    bottom: 0;
    right: 0;
}
.swatch-swap {
    position: absolute;
    top: -2px;
    right: -2px;
    width: 14px;
    height: 14px;
    background: var(--bg-medium);
    border: 1px solid var(--border);
    border-radius: 2px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 9px;
    color: var(--text-secondary);
    z-index: 2;
}
.hex-input {
    display: flex;
    align-items: center;
    gap: 4px;
}
.hex-input label {
    font-size: 10px;
    color: var(--text-dim);
}
.hex-input input {
    width: 70px;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 3px;
    color: var(--text-primary);
    font-size: 11px;
    padding: 2px 4px;
    font-family: monospace;
}

/* History Panel */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 1px;
    max-height: 200px;
    overflow-y: auto;
}
.history-item {
    padding: 4px 8px;
    font-size: 11px;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 2px;
}
.history-item:hover {
    background: var(--hover-bg);
}
.history-item.current {
    color: var(--text-primary);
    background: var(--selected-bg);
    font-weight: 600;
}
.history-item.future {
    color: var(--text-dim);
}

/* Status Bar */
#status-bar {
    display: flex;
    align-items: center;
    height: 22px;
    background: var(--bg-medium);
    border-top: 1px solid var(--border);
    padding: 0 12px;
    gap: 20px;
    font-size: 11px;
    color: var(--text-secondary);
}
.status-item {
    white-space: nowrap;
}

/* Dialogs */
#dialog-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}
#dialog-overlay.hidden {
    display: none;
}
.dialog {
    background: var(--bg-medium);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    min-width: 300px;
    max-width: 500px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}
.dialog-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}
.dialog-field {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}
.dialog-field label {
    width: 80px;
    font-size: 12px;
    color: var(--text-secondary);
}
.dialog-field input, .dialog-field select {
    flex: 1;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 12px;
    padding: 6px 8px;
}
.dialog-field input:focus, .dialog-field select:focus {
    outline: none;
    border-color: var(--accent);
}
.dialog-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 20px;
}
.btn {
    padding: 6px 16px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg-light);
    color: var(--text-primary);
    font-size: 12px;
    cursor: pointer;
}
.btn:hover {
    background: var(--hover-bg);
}
.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}
.btn-primary:hover {
    background: var(--accent-hover);
}

/* Context Menu */
.context-menu {
    position: fixed;
    background: var(--bg-medium);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 4px 0;
    z-index: 3000;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
    min-width: 160px;
}
.context-menu-item {
    padding: 5px 16px;
    cursor: pointer;
    font-size: 12px;
    color: var(--text-primary);
}
.context-menu-item:hover {
    background: var(--accent);
    color: white;
}

/* Utility */
.hidden {
    display: none !important;
}
.no-events {
    pointer-events: none;
}