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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    touch-action: none;
}

#app {
    width: 100%;
    height: 100%;
    position: relative;
}

/* Canvas Layers */
canvas {
    position: absolute;
    top: 0;
    left: 0;
}

#background-canvas {
    z-index: 1;
}

#drawing-canvas {
    z-index: 2;
}

/* Toolbar */
.toolbar {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 200px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    z-index: 100;
    user-select: none;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
}

.toolbar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    background: #333;
    color: white;
    border-radius: 8px 8px 0 0;
    cursor: move;
}

.toolbar.minimized .toolbar-header {
    border-radius: 8px;
}

.toolbar.minimized .toolbar-section {
    display: none;
}

.toolbar-title {
    font-weight: 600;
    font-size: 14px;
}

.toolbar-header-buttons {
    display: flex;
    gap: 4px;
}

#toolbar-minimize {
    background: none;
    border: none;
    color: white;
    font-size: 18px;
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
}

#toolbar-minimize:hover {
    color: #ccc;
}

.toolbar-section {
    padding: 10px 12px;
    border-bottom: 1px solid #eee;
}

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

.toolbar-label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: #666;
    text-transform: uppercase;
    margin-bottom: 8px;
}

/* Tool Buttons */
.tool-group {
    display: flex;
    gap: 4px;
    margin-bottom: 6px;
}

.tool-group:last-child {
    margin-bottom: 0;
}

.tool-btn {
    width: 36px;
    height: 36px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}

.tool-btn svg {
    width: 20px;
    height: 20px;
    fill: #333;
}

.tool-btn:hover {
    background: #f0f0f0;
    border-color: #ccc;
}

.tool-btn.active {
    background: #333;
    border-color: #333;
}

.tool-btn.active svg {
    fill: white;
}

/* Expandable tool groups */
.expandable-group {
    position: relative;
    flex-wrap: wrap;
}

.tool-submenu {
    display: flex;
    gap: 4px;
    width: 100%;
    margin-top: 4px;
    padding-top: 4px;
    border-top: 1px dashed #ddd;
}

.tool-submenu.hidden {
    display: none;
}

.tool-btn.subtool {
    width: 32px;
    height: 32px;
}

.tool-btn.subtool svg {
    width: 16px;
    height: 16px;
}

.tool-btn[data-expandable] {
    position: relative;
}

/* Small indicator showing more options available */
.tool-btn[data-expandable]::before {
    content: '';
    position: absolute;
    bottom: 3px;
    right: 3px;
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-bottom: 4px solid #666;
}

.tool-btn[data-expandable].active::before {
    border-bottom-color: rgba(255, 255, 255, 0.7);
}

.tool-btn[data-expandable].expanded::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid #333;
}

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

.toggle-row input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.toggle-row label {
    font-size: 12px;
    color: #333;
    cursor: pointer;
}

/* Brush Controls */
#brush-size {
    width: 100%;
    margin-bottom: 4px;
}

#brush-size-value {
    font-size: 12px;
    color: #666;
}

#brush-color {
    width: 100%;
    height: 32px;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
    margin-bottom: 8px;
}

.color-presets {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.color-preset {
    width: 24px;
    height: 24px;
    border: 2px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
    transition: transform 0.1s ease;
}

.color-preset:hover {
    transform: scale(1.1);
}

/* Background Options */
.background-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
}

.bg-option {
    border: 2px solid #ddd;
    border-radius: 4px;
    padding: 2px;
    background: white;
    cursor: pointer;
    transition: border-color 0.15s ease;
}

.bg-option:hover {
    border-color: #999;
}

.bg-option.active {
    border-color: #333;
}

.bg-preview {
    width: 100%;
    height: 24px;
    border-radius: 2px;
}

.bg-preview.grid-light {
    background: linear-gradient(#e0e0e0 1px, transparent 1px),
                linear-gradient(90deg, #e0e0e0 1px, transparent 1px);
    background-size: 8px 8px;
    background-color: #ffffff;
}

.bg-preview.grid-dark {
    background: linear-gradient(#333 1px, transparent 1px),
                linear-gradient(90deg, #333 1px, transparent 1px);
    background-size: 8px 8px;
    background-color: #1a1a1a;
}

.bg-preview.grid-sepia {
    background: linear-gradient(#d4c9b0 1px, transparent 1px),
                linear-gradient(90deg, #d4c9b0 1px, transparent 1px);
    background-size: 8px 8px;
    background-color: #f5f0e6;
}

.bg-preview.blank-light {
    background-color: #ffffff;
}

.bg-preview.blank-dark {
    background-color: #1a1a1a;
}

.bg-preview.blank-sepia {
    background-color: #f5f0e6;
}

/* Action Buttons */
.action-buttons,
.export-buttons,
.save-buttons {
    display: flex;
    gap: 6px;
}

.action-btn {
    flex: 1;
    height: 32px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}

.action-btn svg {
    width: 18px;
    height: 18px;
    fill: #333;
}

.action-btn:hover {
    background: #f0f0f0;
}

.action-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.export-btn,
.save-btn {
    flex: 1;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background: white;
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    transition: all 0.15s ease;
}

.export-btn:hover,
.save-btn:hover {
    background: #333;
    color: white;
    border-color: #333;
}

/* Mobile Toggle */
#mobile-toggle {
    display: none;
    position: fixed;
    top: 20px;
    left: 20px;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 8px;
    background: rgba(51, 51, 51, 0.9);
    color: white;
    cursor: pointer;
    z-index: 99;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    padding: 10px;
}

#mobile-toggle svg {
    width: 24px;
    height: 24px;
    fill: white;
}

#toolbar-close {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 20px;
    cursor: pointer;
    padding: 0 4px;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: white;
    border-radius: 8px;
    width: 90%;
    max-width: 400px;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: #333;
    color: white;
}

.modal-title {
    font-weight: 600;
}

#modal-close {
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
}

.modal-body {
    padding: 16px;
    max-height: calc(80vh - 50px);
    overflow-y: auto;
}

#save-form {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

#save-form.hidden {
    display: none;
}

#save-name {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

#save-confirm {
    padding: 8px 16px;
    background: #333;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
}

#file-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    background: #f5f5f5;
    border-radius: 4px;
}

.file-item-name {
    font-size: 14px;
    cursor: pointer;
}

.file-item-name:hover {
    color: #0066cc;
}

.file-item-actions {
    display: flex;
    gap: 8px;
}

.file-item-btn {
    padding: 4px 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background: white;
    cursor: pointer;
    font-size: 12px;
}

.file-item-btn.delete {
    color: #cc0000;
    border-color: #cc0000;
}

.file-item-btn:hover {
    background: #333;
    color: white;
    border-color: #333;
}

.file-item-btn.delete:hover {
    background: #cc0000;
    border-color: #cc0000;
}

.no-files {
    text-align: center;
    color: #999;
    padding: 20px;
}

/* Laser Pointer */
#laser-pointer {
    position: fixed;
    width: 12px;
    height: 12px;
    background: radial-gradient(circle, #ff0000 0%, rgba(255, 0, 0, 0.5) 50%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 50;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 10px #ff0000, 0 0 20px #ff0000;
}

#laser-pointer.hidden {
    display: none;
}

/* Selection overlay */
.selection-overlay {
    position: absolute;
    border: 2px dashed #0066cc;
    background: rgba(0, 102, 204, 0.1);
    pointer-events: none;
    z-index: 10;
}

/* Cursor styles */
.cursor-pencil { cursor: crosshair; }
.cursor-pen { cursor: crosshair; }
.cursor-highlighter { cursor: crosshair; }
.cursor-eraser-pixel { cursor: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><circle cx="12" cy="12" r="10" fill="white" stroke="black" stroke-width="2"/></svg>') 12 12, auto; }
.cursor-eraser-object { cursor: pointer; }
.cursor-lasso { cursor: crosshair; }
.cursor-marquee { cursor: crosshair; }
.cursor-pan { cursor: grab; }
.cursor-pan-active, .cursor-panning { cursor: grabbing; }
.cursor-move { cursor: move; }
.cursor-move-active { cursor: grabbing; }
.cursor-crosshair { cursor: crosshair; }
.cursor-laser { cursor: none; }

/* Mobile Styles */
@media (max-width: 768px) {
    .mobile-only {
        display: block !important;
    }

    #mobile-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    #toolbar-close {
        display: block;
    }

    .toolbar {
        position: fixed;
        top: 0;
        left: -220px;
        width: 220px;
        height: 100%;
        border-radius: 0;
        transition: left 0.3s ease;
        max-height: 100vh;
    }

    .toolbar.open {
        left: 0;
    }

    .toolbar-header {
        border-radius: 0;
    }

    #mobile-toggle.hidden {
        display: none;
    }
}

/* Scrollbar styling */
.toolbar::-webkit-scrollbar,
.modal-body::-webkit-scrollbar {
    width: 6px;
}

.toolbar::-webkit-scrollbar-track,
.modal-body::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.toolbar::-webkit-scrollbar-thumb,
.modal-body::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 3px;
}

.toolbar::-webkit-scrollbar-thumb:hover,
.modal-body::-webkit-scrollbar-thumb:hover {
    background: #999;
}