/* ============================================================
   Z Image Editor — dark theme, Photoshop-inspired 3-column layout
   ============================================================ */

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

:root {
    --bg-app:        #232323;
    --bg-panel:      #2a2a2a;
    --bg-panel-2:    #1e1e1e;
    --bg-toolbar:    #1a1a1a;
    --bg-canvas:     #3a3a3a;
    --bg-checker-1: #555;
    --bg-checker-2: #444;
    --border:        #000;
    --border-2:      #444;
    --border-3:      #222;
    --accent:        #2a82da;
    --accent-2:      #4ea3ff;
    --text:          #d8d8d8;
    --text-mute:     #888;
    --text-bright:   #fff;
    --hover:         #3a3a3a;
    --selected:      #2a82da;
    --danger:        #d04545;
    --good:          #45a070;
}

html, body {
    height: 100%;
    overflow: hidden;
    background: var(--bg-app);
    color: var(--text);
    font: 13px/1.4 -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
    user-select: none;
    -webkit-user-select: none;
}

button {
    font: inherit;
    color: inherit;
    background: none;
    border: 0;
    cursor: pointer;
}

/* ----- environment error ----- */
.env-error {
    margin: 80px auto;
    max-width: 520px;
    padding: 24px;
    background: var(--bg-panel);
    border: 1px solid var(--danger);
    border-radius: 8px;
    text-align: center;
}
.env-error code { background: #000; padding: 1px 6px; border-radius: 3px; }

/* ----- shell layout ----- */
#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* top menu bar */
.topbar {
    display: flex;
    align-items: center;
    height: 44px;
    padding: 0 12px;
    background: linear-gradient(180deg, #2c2c2c, #232323);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.brand {
    font-weight: 600;
    margin-right: 20px;
    letter-spacing: .4px;
}
.brand .ver {
    font-size: 10px;
    color: var(--text-mute);
    margin-left: 6px;
}
.menu { display: flex; gap: 4px; flex: 1; }
.menu-group { position: relative; }
.menu-trigger {
    padding: 6px 12px;
    border-radius: 3px;
}
.menu-trigger:hover { background: var(--hover); }
.menu-dropdown {
    position: absolute;
    left: 0;
    top: 100%;
    margin-top: 2px;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 3px;
    min-width: 180px;
    box-shadow: 0 6px 18px rgba(0,0,0,.5);
    list-style: none;
    padding: 4px 0;
    z-index: 100;
    display: none;
}
.menu-group.open .menu-dropdown { display: block; }
.menu-dropdown li {
    padding: 6px 14px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}
.menu-dropdown li:hover { background: var(--accent); color: #fff; }
.menu-dropdown li.sep { height: 1px; padding: 0; margin: 4px 6px; background: var(--border-2); cursor: default; }
.menu-dropdown li.sep:hover { background: var(--border-2); }
.kbd { color: var(--text-mute); font-size: 11px; font-family: monospace; }

.topbar-info {
    color: var(--text-mute);
    font-size: 12px;
}

.topbar-undo {
    display: flex;
    align-items: center;
    gap: 2px;
    margin-right: 8px;
}
.topbar-btn {
    width: 32px;
    height: 30px;
    display: grid;
    place-items: center;
    color: var(--text);
    border-radius: 3px;
}
.topbar-btn:hover:not(:disabled) {
    background: var(--hover);
    color: #fff;
}
.topbar-btn:disabled {
    opacity: 0.35;
    cursor: default;
}
.topbar-btn svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
}
.topbar-lang {
    display: flex;
    align-items: center;
    gap: 1px;
    margin-right: 8px;
    padding: 0 6px;
    border-left: 1px solid var(--border-2);
    border-right: 1px solid var(--border-2);
}
.topbar-lang-btn {
    width: 26px;
    height: 24px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-mute);
}
.topbar-lang-btn.lang-active {
    color: var(--text-bright);
    background: rgba(74, 158, 234, 0.18);
}
.zoom-btn-row {
    display: flex;
    flex-direction: row;
    gap: 6px;
    margin-bottom: 10px;
}
.zoom-btn-row .btn {
    flex: 1 1 0;
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
    padding: 6px 10px;
}
.zoom-btn-row .btn svg {
    width: 16px;
    height: 16px;
    fill: none;
    stroke: currentColor;
    flex-shrink: 0;
}

/* workspace = toolbar + canvas + panel */
.workspace {
    flex: 1;
    display: flex;
    flex-direction: row;
    min-height: 0;
}

/* left toolbar */
.toolbar {
    width: 52px;
    background: var(--bg-toolbar);
    border-right: 1px solid var(--border);
    padding: 6px 4px;
    overflow-y: auto;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.tool {
    width: 44px;
    height: 44px;
    border-radius: 4px;
    display: grid;
    place-items: center;
    color: var(--text);
}
.tool svg {
    width: 22px;
    height: 22px;
    fill: currentColor;
}
.tool:hover { background: var(--hover); }
.tool.active {
    background: var(--selected);
    color: #fff;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.15);
}
.tool-sep {
    height: 1px;
    background: var(--border-2);
    margin: 6px 6px;
}

/* canvas area */
.canvas-area {
    flex: 1;
    background: var(--bg-canvas);
    position: relative;
    overflow: auto;
    /* checker pattern background to show transparency */
    background-image:
        linear-gradient(45deg, var(--bg-checker-2) 25%, transparent 25%),
        linear-gradient(-45deg, var(--bg-checker-2) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--bg-checker-2) 75%),
        linear-gradient(-45deg, transparent 75%, var(--bg-checker-2) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
}
#canvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    box-shadow: 0 0 0 1px #000, 0 8px 24px rgba(0,0,0,.4);
    cursor: crosshair;
    image-rendering: pixelated; /* crisp at low zoom */
    image-rendering: -moz-crisp-edges;
}
#canvas.tool-move     { cursor: move; }
#canvas.tool-crop     { cursor: crosshair; }
#canvas.tool-eyebrow  { cursor: copy; }
#canvas.tool-zoom     { cursor: zoom-in; }

.overlay {
    position: absolute;
    pointer-events: none;
    inset: 0;
    z-index: 5;
}

.empty-state {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #ddd;
    z-index: 1;
    background: rgba(0,0,0,.55);
    padding: 26px 36px;
    border-radius: 8px;
}
.empty-state p { margin-bottom: 12px; }

.status-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 26px;
    background: rgba(0,0,0,.65);
    color: var(--text-mute);
    font-size: 11px;
    display: flex;
    align-items: center;
    padding: 0 12px;
    gap: 18px;
    z-index: 10;
}

/* right panel */
.panel {
    width: 290px;
    background: var(--bg-panel);
    border-left: 1px solid var(--border);
    overflow-y: auto;
    flex-shrink: 0;
    padding: 0;
}
.panel-section {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-3);
}
.panel-section h3 {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-mute);
    margin-bottom: 10px;
}
.panel-section[hidden] { display: none; }
.row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}
.row label {
    flex: 0 0 70px;
    font-size: 12px;
    color: var(--text);
}
.row .val,
.row span {
    color: var(--text-mute);
    font-size: 11px;
    font-family: monospace;
    margin-left: auto;
}
.row input[type="range"] {
    flex: 1;
    min-width: 0;
}
.row input[type="number"],
.row input[type="text"],
.row select {
    flex: 1;
    min-width: 0;
    background: #111;
    border: 1px solid var(--border-2);
    color: var(--text);
    padding: 4px 6px;
    border-radius: 3px;
    font: inherit;
}
.row input[type="color"] {
    width: 36px;
    height: 24px;
    padding: 0;
    background: transparent;
    border: 1px solid var(--border-2);
    border-radius: 3px;
    cursor: pointer;
    flex: 1;
    min-width: 0;
}

.btn {
    display: inline-block;
    padding: 5px 12px;
    background: linear-gradient(180deg, #4a4a4a, #383838);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 3px;
    font-size: 12px;
}
.btn:hover { background: linear-gradient(180deg, #555, #404040); color: #fff; }
.btn-active,
.btn.btn-active {
    background: linear-gradient(180deg, #d04545, #a52828);
    border-color: #ff5252;
    color: #fff;
}
.btn-active:hover { background: linear-gradient(180deg, #e25555, #b53030); }
.btn-primary {
    background: linear-gradient(180deg, #3a8fda, #2a6fba);
    border-color: #1a4f8a;
    color: #fff;
}
.btn-primary:hover { background: linear-gradient(180deg, #4a9fea, #3a7fca); }
.btn-row { display: flex; gap: 6px; margin-bottom: 8px; }
.btn-row .btn { flex: 1; }

.filter-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
}
.filter-btn {
    padding: 7px 0;
    background: var(--bg-panel-2);
    border: 1px solid var(--border-2);
    border-radius: 3px;
    color: var(--text);
    font-size: 11px;
}
.filter-btn:hover { background: var(--hover); border-color: var(--accent); }
.filter-btn.active {
    background: var(--accent);
    border-color: var(--accent-2);
    color: #fff;
}

.hint {
    margin-top: 8px;
    color: var(--text-mute);
    font-size: 11px;
}

/* modal */
.modal {
    position: fixed; inset: 0;
    background: rgba(0,0,0,.55);
    display: grid; place-items: center;
    z-index: 1000;
}
.modal[hidden] { display: none; }
.modal-box {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 18px 20px;
    min-width: 320px;
    max-width: 90vw;
    box-shadow: 0 12px 40px rgba(0,0,0,.6);
}
.modal-box h3 { margin-bottom: 12px; font-size: 14px; color: var(--text-bright); }
.modal-box input,
.modal-box select {
    width: 100%;
    padding: 6px 8px;
    background: #111;
    border: 1px solid var(--border-2);
    color: var(--text);
    border-radius: 3px;
    margin-bottom: 12px;
}
.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* right panel native scrollbar tweak */
.panel::-webkit-scrollbar,
.toolbar::-webkit-scrollbar,
.canvas-area::-webkit-scrollbar { width: 8px; }
.panel::-webkit-scrollbar-thumb,
.toolbar::-webkit-scrollbar-thumb,
.canvas-area::-webkit-scrollbar-thumb { background: #555; border-radius: 4px; }

/* ----- text object overlay (DOM divs over the canvas) ----- */
#text-overlay {
    position: absolute;
    inset: 0;
    pointer-events: none;          /* let clicks fall through to canvas */
    overflow: hidden;
}
.text-overlay-item {
    position: absolute;
    pointer-events: auto;          /* but each text catches its own */
    cursor: move;
    white-space: pre;
    user-select: none;
    line-height: 1;
    transform-origin: 0 0;
    -webkit-user-drag: none;
}
.text-overlay-item.selected {
    outline: 1px dashed #2a82da;
    outline-offset: 2px;
}
.text-mode-tag {
    display: inline-block;
    margin-left: 6px;
    padding: 1px 6px;
    background: var(--accent);
    border-radius: 8px;
    font-size: 10px;
    color: white;
    font-weight: 400;
    letter-spacing: 0;
    vertical-align: middle;
}
.text-mode-tag[hidden] { display: none; }

/* ----- zoom panel ----- */
.zoom-panel {
    background: linear-gradient(180deg, #2c2c2c, #232323);
}
.zoom-current-row .val,
.zoom-current-row span {
    margin-left: 0;
    flex: 1;
    text-align: right;
    font-family: monospace;
    color: var(--text-bright);
    font-size: 14px;
    font-weight: 600;
}
#text-edit-input {
    position: absolute;
    z-index: 30;
    background: rgba(255, 255, 255, 0.95);
    color: black;
    border: 2px solid #2a82da;
    padding: 1px 4px;
    margin: 0;
    resize: none;
    overflow: hidden;
    outline: none;
    font-family: inherit;
    line-height: 1;
    box-sizing: content-box;
}

#clone-source-marker {
    position: absolute;
    pointer-events: none;
    width: 24px;
    height: 24px;
    transform: translate(-50%, -50%);
    z-index: 5;
    mix-blend-mode: difference;
}
#clone-source-marker svg { width: 100%; height: 100%; }

#healing-source-marker {
    position: absolute;
    pointer-events: none;
    width: 26px;
    height: 26px;
    transform: translate(-50%, -50%);
    z-index: 5;
    mix-blend-mode: difference;
}
#healing-source-marker svg { width: 100%; height: 100%; }

/* utility */
.crop-mask {
    position: absolute;
    inset: 0;
    pointer-events: none;
}
.crop-mask-rect {
    position: absolute;
    background: rgba(0, 0, 0, 0.55);
}
.crop-area {
    position: absolute;
    border: 1px dashed #fff;
    box-shadow: 0 0 0 1px #000;
    pointer-events: none;
}
.crop-handles {
    position: absolute;
    pointer-events: none;
}
.crop-handle {
    position: absolute;
    background: #ffffff;
    border: 1px solid #000000;
    box-sizing: border-box;
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.6);
    border-radius: 2px;
}
.crop-handle.nw { cursor: nwse-resize; }
.crop-handle.ne { cursor: nesw-resize; }
.crop-handle.sw { cursor: nesw-resize; }
.crop-handle.se { cursor: nwse-resize; }
.crop-handle.n  { cursor: ns-resize; }
.crop-handle.s  { cursor: ns-resize; }
.crop-handle.e  { cursor: ew-resize; }
.crop-handle.w  { cursor: ew-resize; }

/* drag/drop hint over canvas */
.canvas-area.dragover::after {
    content: "松开以打开图片";
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    background: rgba(74,158,234,.18);
    color: #fff;
    font-size: 24px;
    font-weight: 600;
    z-index: 100;
    border: 3px dashed var(--accent-2);
}

@media (max-width: 900px) {
    .toolbar { width: 44px; }
    .tool { width: 36px; height: 36px; }
    .tool svg { width: 18px; height: 18px; }
    .panel { width: 260px; }
}