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

:root {
    --bg-dark: #1e1e1e;
    --bg-panel: #2d2d2d;
    --bg-input: #3d3d3d;
    --bg-hover: #404040;
    --bg-selected: #4a90d9;
    --border-color: #404040;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #707070;
    --accent-color: #4a90d9;
    --header-height: 50px;
    --footer-height: 36px;
    --panel-left-width: 260px;
    --panel-right-width: 280px;
    --danger-color: #d94a4a;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 13px;
    background: var(--bg-dark);
    color: var(--text-primary);
}

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

/* Header */
.app-header {
    height: var(--header-height);
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 24px;
}

.app-title {
    font-weight: 600;
    font-size: 15px;
    color: var(--text-primary);
}

.file-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.file-name-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
}

.file-name-input {
    background: transparent;
    border: 1px solid transparent;
    border-radius: 4px;
    padding: 6px 10px;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    min-width: 120px;
    max-width: 200px;
}

.file-name-input:hover {
    background: var(--bg-input);
    border-color: var(--border-color);
}

.file-name-input:focus {
    outline: none;
    background: var(--bg-input);
    border-color: var(--accent-color);
}

.save-status {
    font-size: 11px;
    color: var(--text-muted);
    min-width: 50px;
}

.save-status.saving {
    color: var(--text-secondary);
}

.save-status.saved {
    color: var(--text-muted);
}

.svg-settings {
    display: flex;
    gap: 16px;
}

.svg-settings label {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    font-size: 12px;
}

.svg-settings input[type="number"],
.svg-settings input[type="text"] {
    width: 80px;
    padding: 6px 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-input);
    color: var(--text-primary);
    font-size: 12px;
}

/* Zoom Controls */
.zoom-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 16px;
    padding-left: 16px;
    border-left: 1px solid var(--border-color);
}

.zoom-btn {
    width: 28px;
    height: 28px;
    border: 1px solid var(--border-color);
    background: var(--bg-input);
    color: var(--text-primary);
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 500;
}

.zoom-btn:hover {
    background: var(--bg-hover);
}

#zoom-fit {
    width: auto;
    padding: 0 10px;
    font-size: 11px;
}

#zoom-slider {
    width: 100px;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg-input);
    border-radius: 2px;
    cursor: pointer;
}

#zoom-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
}

#zoom-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.zoom-value {
    font-size: 12px;
    color: var(--text-secondary);
    min-width: 45px;
    text-align: center;
}

/* Footer */
.app-footer {
    height: var(--footer-height);
    background: var(--bg-panel);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 16px;
}

.footer-controls {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-left: auto;
}

.app-footer .svg-settings {
    gap: 12px;
}

.app-footer .svg-settings input[type="number"],
.app-footer .svg-settings input[type="text"] {
    width: 70px;
    padding: 4px 6px;
}

.app-footer .zoom-controls {
    margin-left: 0;
    padding-left: 12px;
    border-left: 1px solid var(--border-color);
}

.app-footer .zoom-btn {
    width: 24px;
    height: 24px;
    font-size: 14px;
}

.app-footer #zoom-fit {
    padding: 0 8px;
    height: 24px;
}

/* Buttons */
.btn {
    padding: 6px 14px;
    border: 1px solid var(--border-color);
    background: var(--bg-input);
    color: var(--text-primary);
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: background-color 0.15s, border-color 0.15s;
}

.btn:hover {
    background: var(--bg-hover);
    border-color: #555;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
}

.btn-danger:hover {
    background: #c43c3c;
}

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

/* Main Content - Three Panel Layout */
.main-content {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-panel);
}

.panel-left {
    width: var(--panel-left-width);
    flex-shrink: 0;
    border-right: 1px solid var(--border-color);
}

.panel-center {
    flex: 1;
    background: var(--bg-dark);
    overflow: auto;
    position: relative;
}

.canvas-wrapper {
    display: block;
    min-width: 100%;
    min-height: 100%;
    box-sizing: border-box;
}

.panel-right {
    width: var(--panel-right-width);
    flex-shrink: 0;
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: row;
}

.panel-right-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-right-tools {
    width: 48px;
    flex-shrink: 0;
    background: var(--bg-dark);
    border-left: 1px solid var(--border-color);
    padding: 12px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    height: 100%;
}

.panel-header {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.panel-content {
    flex: 1;
    overflow-y: auto;
}

/* Canvas */
.canvas-container {
    background: white;
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    transition: transform 0.1s ease-out;
    flex-shrink: 0;
}

#svg-canvas {
    display: block;
    cursor: crosshair;
}

#svg-canvas.tool-select {
    cursor: default;
}

/* Layers Panel - Dark Theme */
.layers-list {
    list-style: none;
    padding: 8px;
}

.layer-item {
    display: flex;
    align-items: center;
    padding: 8px;
    border-radius: 6px;
    cursor: pointer;
    background: transparent;
    transition: background-color 0.15s;
    margin-bottom: 2px;
    gap: 12px;
}

.layer-item:hover {
    background-color: var(--bg-hover);
}

.layer-item.selected {
    background-color: rgba(74, 144, 217, 0.25);
}

.layer-thumbnail {
    width: 48px;
    height: 48px;
    background: var(--bg-input);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
}

.layer-thumbnail svg {
    width: 32px;
    height: 32px;
}

.layer-info {
    flex: 1;
    min-width: 0;
}

.layer-name {
    font-weight: 500;
    font-size: 13px;
    color: var(--text-primary);
    margin-bottom: 2px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.layer-name-icon {
    color: var(--text-muted);
}

.layer-dimensions {
    font-size: 11px;
    color: var(--text-secondary);
}

.layer-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.layer-visibility {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--accent-color);
}

.layer-duplicate-btn {
    padding: 6px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.15s, background-color 0.15s, color 0.15s;
}

.layer-item:hover .layer-duplicate-btn {
    opacity: 1;
}

.layer-duplicate-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.layer-item.dragging {
    opacity: 0.5;
}

.layer-item.drag-over {
    border-top: 2px solid var(--accent-color);
    margin-top: -2px;
}

/* Right Panel - Properties */
.properties-section {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.properties-section:last-child {
    border-bottom: none;
}

.properties-section h3 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 14px;
}

.property-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.property-row:last-child {
    margin-bottom: 0;
}

.property-field {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
}

.property-field label {
    font-size: 12px;
    color: var(--text-secondary);
    min-width: 20px;
}

.property-input-wrapper {
    position: relative;
    flex: 1;
}

.property-input {
    width: 100%;
    padding: 8px 32px 8px 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-input);
    color: var(--text-primary);
    font-size: 12px;
    text-align: right;
}

.property-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.property-suffix {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 11px;
    color: var(--text-muted);
    pointer-events: none;
}

.property-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 12px;
}

.property-checkbox input {
    accent-color: var(--accent-color);
}

.property-checkbox label {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Text content input */
.text-content-input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-input);
    color: var(--text-primary);
    font-size: 13px;
    font-family: inherit;
    resize: vertical;
    min-height: 60px;
}

.text-content-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* Color inputs */
.color-field {
    display: flex;
    align-items: center;
    gap: 10px;
}

.color-input-wrapper {
    position: relative;
    width: 32px;
    height: 32px;
}

.color-input-wrapper input[type="color"] {
    width: 100%;
    height: 100%;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    padding: 0;
    background: none;
}

.color-input-wrapper input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 2px;
}

.color-input-wrapper input[type="color"]::-webkit-color-swatch {
    border-radius: 3px;
    border: none;
}

.no-color-btn {
    padding: 6px 10px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
    font-size: 11px;
    cursor: pointer;
}

.no-color-btn:hover {
    background: var(--bg-hover);
}

.no-color-btn.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* Tool buttons in sidebar */
.tool-btn-icon {
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all 0.15s;
}

.tool-btn-icon:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.tool-btn-icon.active {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.tool-btn-icon svg {
    width: 20px;
    height: 20px;
}

/* Delete button */
.btn-delete {
    width: 100%;
    padding: 10px;
    background: transparent;
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    margin-top: 8px;
}

.btn-delete:hover {
    background: var(--danger-color);
    color: white;
}

/* Hint text */
.hint {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 12px;
    padding: 8px;
    background: var(--bg-input);
    border-radius: 4px;
}

/* Handles */
.handle {
    cursor: move;
}

/* Shape styling */
[data-shape-id] {
    cursor: pointer;
}

[data-shape-id]:hover {
    filter: brightness(0.95);
}

/* Hidden state */
[hidden] {
    display: none !important;
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* File Browser Dialog */
.file-browser-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
}

.file-browser-overlay.open {
    opacity: 1;
    visibility: visible;
}

.file-browser-dialog {
    background: var(--bg-panel);
    border-radius: 8px;
    width: 90%;
    max-width: 700px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.file-browser-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.file-browser-header h2 {
    font-size: 16px;
    font-weight: 600;
    margin: 0;
}

.file-browser-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.file-browser-close:hover {
    color: var(--text-primary);
}

.file-browser-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
}

.file-browser-sort {
    display: flex;
    align-items: center;
    gap: 8px;
}

.file-browser-sort label {
    font-size: 12px;
    color: var(--text-secondary);
}

.file-browser-sort-select {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 6px 10px;
    color: var(--text-primary);
    font-size: 12px;
    cursor: pointer;
}

.file-browser-sort-dir {
    padding: 6px 10px;
}

.sort-icon {
    font-size: 14px;
}

.file-browser-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    min-height: 200px;
}

.file-browser-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
}

.file-item {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    cursor: pointer;
    transition: border-color 0.15s, background-color 0.15s;
    position: relative;
}

.file-item:hover {
    border-color: var(--accent-color);
    background: var(--bg-hover);
}

.file-item-thumbnail {
    width: 100%;
    aspect-ratio: 4/3;
    background: white;
    border-radius: 4px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.file-item-thumbnail svg {
    width: 100%;
    height: 100%;
}

.file-item-placeholder {
    width: 40px;
    height: 40px;
    background: var(--bg-panel);
    border-radius: 4px;
}

.file-item-info {
    min-width: 0;
}

.file-item-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
}

.file-item-date {
    font-size: 11px;
    color: var(--text-muted);
}

.file-item-delete {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--bg-dark);
    border: none;
    color: var(--text-secondary);
    width: 24px;
    height: 24px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    opacity: 0;
    transition: opacity 0.15s;
}

.file-item:hover .file-item-delete {
    opacity: 1;
}

.file-item-delete:hover {
    background: var(--danger-color);
    color: white;
}

.file-browser-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.file-browser-empty p {
    margin: 8px 0;
}

.file-browser-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-start;
}