* {
    box-sizing: border-box;
}

:root {
    --bg: #101216;
    --panel: #181b21;
    --panel2: #20242b;
    --border: #30353e;
    --text: #e8eaf0;
    --muted: #8e96a3;
    --accent: #6c8cff;
    --accent-hover: #819cff;
    --danger: #d95353;
}

html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family:
        Inter,
        "Segoe UI",
        Arial,
        sans-serif;
}

body {
    overflow: hidden;
}

button,
input,
select {
    font: inherit;
}

button {
    cursor: pointer;
}

.app {
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* TOP BAR */

.topbar {
    height: 70px;
    flex-shrink: 0;

    display: flex;
    align-items: center;
    justify-content: space-between;

    padding: 0 20px;

    background: #15181d;
    border-bottom: 1px solid var(--border);
}

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

.brand-icon {
    width: 38px;
    height: 38px;

    display: grid;
    place-items: center;

    background: var(--accent);
    color: white;

    border-radius: 9px;

    font-size: 18px;
}

.brand h1 {
    margin: 0;
    font-size: 17px;
    font-weight: 600;
}

.brand span {
    display: block;
    color: var(--muted);
    font-size: 11px;
    margin-top: 2px;
}

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

.top-btn {
    border: 1px solid var(--border);
    background: var(--panel2);
    color: var(--text);

    padding: 9px 15px;
    border-radius: 7px;
}

.top-btn:hover {
    background: #292e37;
}

.top-btn.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

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

/* WORKSPACE */

.workspace {
    flex: 1;
    min-height: 0;
    display: flex;
}

/* SIDEBARS */

.sidebar {
    width: 235px;
    flex-shrink: 0;

    background: #15181d;

    overflow-y: auto;

    padding: 12px;
}

.left-sidebar {
    border-right: 1px solid var(--border);
}

.right-sidebar {
    border-left: 1px solid var(--border);
}

.panel {
    background: var(--panel);

    border: 1px solid var(--border);
    border-radius: 9px;

    padding: 12px;
    margin-bottom: 12px;
}

.panel h2 {
    margin: 0 0 11px;

    font-size: 12px;

    color: var(--muted);

    text-transform: uppercase;

    letter-spacing: .7px;
}

.panel h3 {
    font-size: 12px;
    margin: 0 0 8px;
}

/* TOOLS */

.tool {
    width: 100%;

    display: flex;
    align-items: center;

    gap: 10px;

    border: 1px solid transparent;

    background: transparent;

    color: var(--text);

    padding: 8px 10px;

    border-radius: 6px;

    margin-bottom: 4px;

    text-align: left;
}

.tool span {
    width: 20px;
    text-align: center;
}

.tool:hover {
    background: var(--panel2);
}

.tool.active {
    background: rgba(108, 140, 255, .16);

    border-color:
        rgba(108, 140, 255, .35);

    color: #a9b9ff;
}

/* BUTTONS */

.action-btn,
.button-grid button {
    border: 1px solid var(--border);

    background: var(--panel2);

    color: var(--text);

    padding: 8px 9px;

    border-radius: 6px;

    margin-bottom: 6px;
}

.action-btn {
    width: 100%;
    text-align: left;
}

.action-btn:hover,
.button-grid button:hover {
    background: #2a2f38;
}

.action-btn.danger:hover {
    border-color: var(--danger);
    color: #ff8585;
}

.button-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}

/* INPUTS */

label {
    display: block;

    color: var(--muted);

    font-size: 11px;

    margin-bottom: 5px;
}

select,
.text-input {
    width: 100%;

    border: 1px solid var(--border);

    background: #101216;

    color: var(--text);

    padding: 8px;

    border-radius: 6px;

    outline: none;

    margin-bottom: 8px;
}

select:focus,
.text-input:focus {
    border-color: var(--accent);
}

input[type="range"] {
    width: 100%;
    margin-bottom: 10px;
}

/* ZOOM */

.zoom-controls {
    display: flex;

    align-items: center;

    justify-content: space-between;

    gap: 7px;

    margin-bottom: 8px;
}

.zoom-controls button {
    width: 34px;
    min-width: 34px;
    height: 30px;
    min-height: 30px;
    flex: 0 0 34px;

    box-sizing: border-box;
    border: 1px solid var(--border);

    background: var(--panel2);

    color: var(--text);

    border-radius: 5px;

    padding: 0 8px;
    margin: 0;
    line-height: 28px;
    white-space: nowrap;
}

.zoom-controls #zoomResetBtn,
.zoom-controls #fitViewBtn,
.zoom-controls #centerViewBtn {
    flex: 0 0 auto;
    width: auto;
    min-width: 52px;
    padding: 0 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.zoom-controls #fitViewBtn {
    min-width: 44px;
}

.zoom-controls #centerViewBtn {
    min-width: 60px;
}

.zoom-controls span {
    flex: 1;

    text-align: center;

    color: var(--muted);

    font-size: 12px;
}

/* CANVAS */

.canvas-area {
    flex: 1;

    min-width: 0;

    display: flex;

    flex-direction: column;

    background:
        radial-gradient(
            circle at center,
            #20242b 0%,
            #111318 70%
        );
}

.canvas-header {
    height: 54px;

    flex-shrink: 0;

    display: flex;

    justify-content: space-between;

    align-items: center;

    padding: 0 18px;

    border-bottom: 1px solid var(--border);

    background:
        rgba(15, 17, 21, .8);
}

.canvas-header strong {
    display: block;
    font-size: 13px;
}

.canvas-header span {
    color: var(--muted);
    font-size: 10px;
}

.canvas-actions {
    display: flex;
    gap: 6px;
}

.canvas-actions button {
    border: 1px solid var(--border);

    background: var(--panel);

    color: var(--text);

    border-radius: 6px;

    padding: 7px 10px;
}

.canvas-container {
    flex: 1;

    min-height: 0;

    overflow: auto;

    display: flex;

    align-items: center;

    justify-content: center;

    padding: 40px;

    cursor: crosshair;
    overscroll-behavior: contain;
    user-select: none;
}

#canvasWrapper {
    transform-origin: center;
    transition: none;
    flex: 0 0 auto;
}

.canvas-container.pan-mode {
    cursor: grab;
}

.canvas-container.panning {
    cursor: grabbing;
}

.canvas-container.pan-mode #pixelCanvas {
    cursor: grab;
}

.canvas-container.panning #pixelCanvas {
    cursor: grabbing;
}

#pixelCanvas {
    image-rendering: pixelated;
    image-rendering: crisp-edges;

    cursor: crosshair;

    box-shadow:
        0 20px 50px rgba(0, 0, 0, .45),
        0 0 0 1px #555;

    background-color: white;

    touch-action: none;
}

.canvas-footer {
    height: 34px;

    flex-shrink: 0;

    display: flex;

    align-items: center;

    justify-content: space-between;

    padding: 0 14px;

    border-top: 1px solid var(--border);

    color: var(--muted);

    font-size: 11px;
}

/* COLOR */

.current-color {
    display: flex;

    align-items: center;

    gap: 10px;

    margin-bottom: 10px;
}

#colorPreview {
    width: 42px;
    height: 42px;

    border-radius: 7px;

    border: 1px solid #555;

    background: #000;
}

.current-color span {
    display: block;

    font-size: 10px;

    color: var(--muted);
}

.current-color strong {
    font-size: 13px;
}

#colorPicker {
    width: 100%;
    height: 42px;

    padding: 3px;

    border: 1px solid var(--border);

    border-radius: 6px;

    background: #101216;

    cursor: pointer;

    margin-bottom: 8px;
}

/* PALETTE */

.palette {
    display: grid;

    grid-template-columns:
        repeat(6, 1fr);

    gap: 5px;

    margin-bottom: 8px;
}

.palette-color,
.quick-colors button {
    border: 1px solid #444;

    border-radius: 5px;

    padding: 0;

    aspect-ratio: 1;
}

.palette-color:hover {
    transform: scale(1.08);
}

.color-history {
    display: grid;

    grid-template-columns:
        repeat(8, 1fr);

    gap: 4px;
}

.history-color {
    width: 100%;
    aspect-ratio: 1;

    border: 1px solid #555;

    border-radius: 4px;

    cursor: pointer;
}

/* LAYERS */

.layers {
    max-height: 180px;

    overflow-y: auto;

    margin-bottom: 8px;
}

.layer-item {
    display: flex;

    align-items: center;

    gap: 7px;

    padding: 7px;

    border-radius: 5px;

    background: #101216;

    border: 1px solid var(--border);

    margin-bottom: 4px;

    font-size: 11px;
}

.layer-item.active {
    border-color: var(--accent);
}

.layer-eye {
    cursor: pointer;
}

/* FRAMES */

.frames {
    display: flex;

    gap: 5px;

    overflow-x: auto;

    padding-bottom: 5px;
}

.frame {
    min-width: 48px;
    height: 48px;

    background: #101216;

    border: 1px solid var(--border);

    border-radius: 5px;

    display: grid;

    place-items: center;

    cursor: pointer;

    font-size: 11px;
}

.frame.active {
    border-color: var(--accent);
}

/* MODALS */

.modal {
    position: fixed;

    inset: 0;

    background:
        rgba(0, 0, 0, .72);

    display: flex;

    align-items: center;

    justify-content: center;

    z-index: 1000;
}

.modal.hidden {
    display: none;
}

.modal-box {
    width: min(430px, calc(100vw - 30px));

    max-height: 90vh;

    overflow-y: auto;

    background: #181b21;

    border: 1px solid var(--border);

    border-radius: 12px;

    padding: 22px;

    box-shadow:
        0 20px 70px rgba(0, 0, 0, .6);
}

.modal-box.wide {
    width: min(850px, calc(100vw - 30px));
}

.modal-box h2 {
    margin: 0 0 6px;
    font-size: 18px;
}

.modal-box p {
    margin: 0 0 18px;

    color: var(--muted);

    font-size: 13px;
}

.new-sizes,
.background-options {
    display: grid;

    grid-template-columns:
        repeat(4, 1fr);

    gap: 8px;
}

.new-sizes button,
.background-options button {
    border: 1px solid var(--border);

    background: var(--panel2);

    color: var(--text);

    padding: 12px;

    border-radius: 7px;
}

.new-sizes button:hover,
.background-options button:hover {
    border-color: var(--accent);
}

.cancel-btn {
    width: 100%;

    margin-top: 15px;

    padding: 9px;

    border: 1px solid var(--border);

    background: transparent;

    color: var(--muted);

    border-radius: 6px;
}

.check-row {
    display: flex;

    align-items: center;

    gap: 8px;

    margin: 10px 0;
}

.projects-list {
    display: grid;
    gap: 8px;
}

.project-item {
    display: flex;

    justify-content: space-between;

    align-items: center;

    background: #101216;

    border: 1px solid var(--border);

    border-radius: 7px;

    padding: 10px;
}

.tile-editor {
    display: grid;

    grid-template-columns:
        1fr 260px;

    gap: 20px;
}

#tileCanvas {
    width: 100%;

    max-width: 500px;

    image-rendering: pixelated;

    background:
        repeating-conic-gradient(
            #eee 0% 25%,
            #ccc 0% 50%
        ) 50% / 20px 20px;
}

.tile-palette {
    display: grid;

    grid-template-columns:
        repeat(4, 1fr);

    gap: 5px;

    margin-bottom: 10px;
}

.tile-palette canvas {
    width: 50px;
    height: 50px;

    image-rendering: pixelated;

    border: 1px solid var(--border);

    cursor: pointer;
}

#spritePreview {
    max-width: 100%;

    image-rendering: pixelated;

    margin-top: 15px;

    border: 1px solid var(--border);
}

/* STATUS */

.statusbar {
    height: 27px;

    flex-shrink: 0;

    background: #0c0e11;

    border-top: 1px solid var(--border);

    color: var(--muted);

    display: flex;

    align-items: center;

    justify-content: space-between;

    padding: 0 12px;

    font-size: 10px;
}

/* MOBILE */

@media (max-width: 1100px) {

    .sidebar {
        width: 190px;
    }

}

@media (max-width: 800px) {

    .right-sidebar {
        display: none;
    }

    .sidebar {
        width: 180px;
    }

}

@media (max-width: 600px) {

    .left-sidebar {
        width: 55px;
        padding: 5px;
    }

    .left-sidebar .panel {
        padding: 5px;
    }

    .left-sidebar .panel h2,
    .left-sidebar .tool:not(.active)::after,
    .left-sidebar .action-btn,
    .left-sidebar label,
    .left-sidebar select,
    .left-sidebar input {
        display: none;
    }

    .tool {
        justify-content: center;
        padding: 12px 5px;
    }

    .tool span {
        margin: 0;
    }

    .brand h1 {
        font-size: 14px;
    }

    .brand span {
        display: none;
    }

    .top-btn {
        font-size: 11px;
        padding: 7px 9px;
    }

    .top-btn:nth-child(2),
    .top-btn:nth-child(3) {
        display: none;
    }

    .canvas-container {
        padding: 20px;
    }

    .canvas-actions button {
        padding: 5px;
        font-size: 10px;
    }

    .tile-editor {
        grid-template-columns: 1fr;
    }

}
/* AI Builder */
.ai-grid { display:grid; grid-template-columns:1fr 1fr; gap:12px; margin:12px 0; }
.ai-grid > div { display:flex; flex-direction:column; gap:6px; }
.ai-actions { display:flex; flex-wrap:wrap; gap:8px; margin-top:12px; }
.ai-log { min-height:110px; max-height:220px; overflow:auto; white-space:pre-wrap; margin-top:12px; padding:12px; border:1px solid var(--border); background:var(--panel); border-radius:8px; }
.muted { color:var(--muted); }
@media (max-width:700px) { .ai-grid { grid-template-columns:1fr; } }


/* Animation controls */
.fps-row { display:flex; align-items:center; gap:10px; margin:8px 0; }
.fps-row input[type="range"] { flex:1; min-width:0; }
.fps-row output { min-width:58px; text-align:right; font-variant-numeric:tabular-nums; }
.animation-preview-box { max-width:760px; }
.animation-stage { display:flex; align-items:center; justify-content:center; min-height:360px; padding:16px; background:rgba(0,0,0,.18); border-radius:10px; }
#animationPreviewCanvas { width:min(512px,100%); height:auto; image-rendering:pixelated; image-rendering:crisp-edges; background:transparent; }
.animation-controls { display:flex; align-items:center; gap:10px; flex-wrap:wrap; margin-top:12px; }
.preview-fps { margin-top:12px; }

/* KEYBOARD SHORTCUTS */
.shortcuts-box {
    max-width: 900px;
}

.shortcuts-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.shortcuts-header p {
    margin-bottom: 0;
}

.shortcut-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.shortcut-group {
    background: var(--panel2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px;
}

.shortcut-group h3 {
    margin: 0 0 10px;
    font-size: 14px;
}

.shortcut-group > div {
    display: flex;
    align-items: center;
    gap: 6px;
    min-height: 30px;
    font-size: 13px;
}

.shortcut-group > div span {
    margin-left: auto;
    color: var(--muted);
}

kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    min-height: 24px;
    padding: 2px 7px;
    border: 1px solid var(--border);
    border-bottom-width: 2px;
    border-radius: 5px;
    background: var(--bg);
    color: var(--text);
    font: 11px/1.2 monospace;
}

@media (max-width: 700px) {
    .shortcut-grid {
        grid-template-columns: 1fr;
    }
}


/* Custom shortcut editor */

.shortcuts-box { max-width: 980px; }
.shortcuts-header { display:flex; align-items:flex-start; justify-content:space-between; gap:16px; margin-bottom:16px; }
.shortcuts-header p { margin-bottom:4px; }
.shortcuts-header-actions { display:flex; gap:8px; flex-wrap:wrap; }
.shortcut-count { color:var(--muted); }
.shortcut-editor-help { background:var(--panel2); border:1px solid var(--border); border-radius:10px; padding:12px; margin-bottom:12px; color:var(--muted); }
.shortcut-editor-list { display:flex; flex-direction:column; gap:6px; max-height:60vh; overflow:auto; padding-right:3px; }
.shortcut-editor-row { display:grid; grid-template-columns:minmax(180px,1fr) 190px 70px; align-items:center; gap:8px; padding:8px 10px; background:var(--panel2); border:1px solid var(--border); border-radius:8px; }
.shortcut-editor-name { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.shortcut-key-button, .shortcut-clear-button { min-height:34px; }
.shortcut-key-button.capturing { border-color:var(--accent); box-shadow:0 0 0 2px rgba(255,255,255,.08); }
.shortcut-key-button.shortcut-conflict { border-color:#d55; }
@media (max-width:700px) { .shortcut-editor-row { grid-template-columns:1fr; } .shortcut-clear-button { width:100%; } .shortcuts-header { flex-direction:column; } }


/* ================= PIXEL ART STUDIO UPGRADE ================= */
.layer-properties {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 6px 8px;
    margin: 10px 0;
    align-items: center;
}
.layer-properties label {
    color: var(--muted);
    font-size: 11px;
}
.layer-properties input[type="range"] {
    width: 100%;
    grid-column: 1 / -1;
}
.layer-properties select {
    min-width: 0;
}
.layer-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
}
.layer-lock {
    margin-left: auto;
    cursor: pointer;
    opacity: .8;
}
.layer-item.locked {
    opacity: .65;
}
.palette-picker-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    align-items: end;
}
.palette-picker-grid label {
    display: flex;
    flex-direction: column;
    gap: 5px;
}
.palette-picker-grid input[type="color"] {
    width: 100%;
    height: 42px;
}
.quick-colors {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 6px;
    margin: 14px 0;
}
.quick-color {
    height: 30px;
    border: 1px solid var(--border);
    border-radius: 5px;
}
.palette-picker-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}
.tileset-editor-layout {
    display: grid;
    grid-template-columns: minmax(280px, 1fr) 300px;
    gap: 16px;
    min-height: 420px;
}
.tileset-workbench {
    background: #0d0f13;
    border: 1px solid var(--border);
    border-radius: 9px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 380px;
    overflow: auto;
}
#tilesetPreviewCanvas {
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    border: 1px solid var(--border);
    background-image:
        linear-gradient(45deg, #222 25%, transparent 25%),
        linear-gradient(-45deg, #222 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #222 75%),
        linear-gradient(-45deg, transparent 75%, #222 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}
.tileset-editor-info {
    margin-top: 10px;
    color: var(--muted);
    font-size: 12px;
}
.tileset-sidebar {
    border-left: 1px solid var(--border);
    padding-left: 14px;
    overflow: auto;
}
.tileset-library {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 7px;
    max-height: 300px;
    overflow: auto;
    margin-bottom: 10px;
}
.tileset-tile {
    min-height: 80px;
    background: #101216;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 5px;
    color: var(--text);
    font-size: 10px;
}
.tileset-tile.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent);
}
.tileset-tile canvas {
    width: 64px;
    height: 64px;
    display: block;
    margin: auto;
    image-rendering: pixelated;
}
@media (max-width: 900px) {
    .tileset-editor-layout { grid-template-columns: 1fr; }
    .tileset-sidebar { border-left: 0; padding-left: 0; }
}



/* ================= PIXEL SNAP / RULERS / GUIDES ================= */
#canvasWrapper { position: relative; }
.canvas-ruler {
    position: absolute;
    display: none;
    pointer-events: none;
    z-index: 8;
    color: var(--muted);
    font: 9px/1 sans-serif;
    overflow: hidden;
    background: rgba(20,23,29,.94);
}
.canvas-ruler-top { left: 0; top: -22px; width: 100%; height: 22px; border-bottom: 1px solid var(--border); }
.canvas-ruler-left { left: -30px; top: 0; width: 30px; height: 100%; border-right: 1px solid var(--border); }
.canvas-ruler span { position: absolute; white-space: nowrap; }
.canvas-guide {
    display: none;
    position: absolute;
    z-index: 7;
    pointer-events: none;
    background: rgba(118,215,255,.8);
    box-shadow: 0 0 0 1px rgba(118,215,255,.15);
}
.canvas-guide-vertical { top: 0; bottom: 0; width: 1px; }
.canvas-guide-horizontal { left: 0; right: 0; height: 1px; }
.canvas-rulers-visible .canvas-ruler { display: block; }
.canvas-guides-visible .canvas-guide { display: block; }
#pixelCanvas { touch-action: none; }

/* ================= UI RESIZING ================= */
.panel {
    position: relative;
    min-width: 120px;
    min-height: 45px;
    overflow: auto;
}

.sidebar {
    min-width: 180px;
}

/* Visual resize feedback. JavaScript enables the exact edge being dragged. */
.ui-resize-ew { cursor: ew-resize !important; }
.ui-resize-ns { cursor: ns-resize !important; }
.ui-resize-nwse { cursor: nwse-resize !important; }

.danger-btn {
    border: 1px solid #7b3d3d;
    background: #2b1c1f;
    color: #ffb4b4;
    border-radius: 7px;
    padding: 8px 10px;
    cursor: pointer;
}
.danger-btn:hover { background: #3a2327; }

.palette-color {
    position: relative;
    cursor: pointer;
}
.palette-color.removable::after {
    content: "×";
    position: absolute;
    top: 1px;
    right: 2px;
    font-size: 11px;
    line-height: 11px;
    color: white;
    text-shadow: 0 1px 2px #000;
    opacity: .0;
    pointer-events: none;
}
.palette-color:hover::after { opacity: 1; }


/* ================= CROSS-DEVICE / TOUCH UI ================= */
html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    touch-action: manipulation;
}

body {
    overscroll-behavior: none;
    -webkit-tap-highlight-color: transparent;
}

button, input, select {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.canvas-container {
    touch-action: none;
    overscroll-behavior: contain;
    -webkit-user-select: none;
    user-select: none;
    -webkit-overflow-scrolling: touch;
}

#pixelCanvas {
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
    -ms-touch-action: none;
}

.mobile-controls {
    display: none;
}

/* Phones/tablets: keep the editor usable without changing its core logic. */
@media (max-width: 900px), (pointer: coarse) {
    body {
        overflow: hidden;
    }

    .topbar {
        height: 58px;
        padding: 0 10px;
        gap: 8px;
    }

    .brand {
        min-width: 0;
        gap: 8px;
    }

    .brand-icon {
        width: 32px;
        height: 32px;
        flex: 0 0 32px;
    }

    .brand h1 {
        font-size: 14px;
        white-space: nowrap;
    }

    .brand span {
        display: none;
    }

    .top-actions {
        gap: 5px;
        overflow-x: auto;
        scrollbar-width: none;
        -webkit-overflow-scrolling: touch;
    }
    .top-actions::-webkit-scrollbar { display: none; }

    .top-btn {
        min-height: 40px;
        min-width: 44px;
        padding: 8px 11px;
        white-space: nowrap;
    }

    .workspace {
        position: relative;
        min-height: 0;
    }

    .sidebar {
        width: min(82vw, 300px);
        min-width: 180px;
        padding: 8px;
        overscroll-behavior: contain;
        -webkit-overflow-scrolling: touch;
    }

    .left-sidebar {
        position: absolute;
        z-index: 30;
        inset: 0 auto 0 0;
        box-shadow: 8px 0 24px rgba(0,0,0,.35);
        transform: translateX(-105%);
        transition: transform .22s ease;
        will-change: transform;
    }

    body.mobile-tools-open .left-sidebar {
        transform: translateX(0);
    }

    .right-sidebar {
        width: min(88vw, 330px);
        display: none;
    }

    .panel {
        margin-bottom: 8px;
        border-radius: 10px;
        padding: 10px;
    }

    .tool,
    .action-btn,
    .top-btn {
        min-height: 42px;
    }

    .canvas-area {
        min-width: 0;
        width: 100%;
    }

    .canvas-toolbar,
    .zoom-controls {
        flex-wrap: wrap;
        gap: 6px;
    }

    .zoom-controls button {
        min-width: 42px;
        min-height: 42px;
    }

    .zoom-controls #zoomResetBtn,
    .zoom-controls #fitViewBtn,
    .zoom-controls #centerViewBtn {
        flex: 1 1 auto;
        min-width: 72px;
    }

    .mobile-controls {
        position: fixed;
        z-index: 100;
        left: 50%;
        bottom: max(10px, env(safe-area-inset-bottom));
        transform: translateX(-50%);
        display: flex;
        align-items: center;
        gap: 6px;
        padding: 7px;
        max-width: calc(100vw - 16px);
        overflow-x: auto;
        background: rgba(24,27,33,.92);
        border: 1px solid rgba(255,255,255,.12);
        border-radius: 14px;
        box-shadow: 0 10px 30px rgba(0,0,0,.4);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        scrollbar-width: none;
    }

    .mobile-controls::-webkit-scrollbar { display: none; }

    .mobile-controls button {
        flex: 0 0 auto;
        min-width: 44px;
        min-height: 44px;
        padding: 8px 11px;
        border: 1px solid var(--border);
        border-radius: 9px;
        background: var(--panel2);
        color: var(--text);
        font-weight: 600;
        touch-action: manipulation;
    }

    .mobile-controls button:active {
        transform: scale(.96);
        background: var(--accent);
        color: white;
    }

    .canvas-footer {
        padding-bottom: 62px;
    }

    /* Prevent accidental text selection while drawing. */
    .canvas-area, .canvas-container, .canvas-wrapper {
        -webkit-user-select: none;
        user-select: none;
    }
}

@media (max-width: 600px) {
    .top-actions .top-btn:nth-child(2),
    .top-actions .top-btn:nth-child(5) {
        display: none;
    }

    .canvas-toolbar {
        padding: 6px;
    }

    .canvas-footer {
        font-size: 10px;
        gap: 7px;
    }

    .statusbar {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .left-sidebar,
    .mobile-controls,
    * {
        scroll-behavior: auto !important;
        transition-duration: .01ms !important;
        animation-duration: .01ms !important;
    }
}