/*
 * Bmage editor styles.
 *
 * Everything is driven by custom properties on .bmg-editor, so a host restyles the whole editor by overriding a handful
 * of variables rather than fighting specificity. Dark mode, right-to-left layout, high contrast and reduced motion are
 * all handled here; no component hard-codes a colour.
 */

.bmg-editor {
    /* Surfaces */
    --bmg-bg: #ffffff;
    --bmg-bg-subtle: #f5f6f8;
    --bmg-bg-sunken: #e9ebef;
    --bmg-canvas-bg: #6b7280;
    --bmg-border: #d5d8de;

    /* Text */
    --bmg-text: #14161a;
    --bmg-text-muted: #5c626e;

    /* Accent */
    --bmg-accent: #2563eb;
    --bmg-accent-text: #ffffff;
    --bmg-accent-subtle: #dbe6fe;
    --bmg-danger: #dc2626;

    /* Metrics */
    --bmg-radius: 8px;
    --bmg-radius-sm: 5px;
    --bmg-gap: 8px;
    --bmg-toolbar-height: 48px;
    --bmg-panel-width: 280px;
    --bmg-focus-ring: 2px solid var(--bmg-accent);
    --bmg-shadow: 0 1px 3px rgb(0 0 0 / 0.12), 0 1px 2px rgb(0 0 0 / 0.08);
    --bmg-transition: 120ms ease;

    display: flex;
    flex-direction: column;
    min-height: 320px;
    height: 100%;
    background: var(--bmg-bg);
    color: var(--bmg-text);
    border: 1px solid var(--bmg-border);
    border-radius: var(--bmg-radius);
    overflow: hidden;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.45;
    /* Contains the absolutely positioned overlays. */
    position: relative;
}

@media (prefers-color-scheme: dark) {
    .bmg-editor:not(.bmg-theme-light) {
        --bmg-bg: #16181d;
        --bmg-bg-subtle: #1e2128;
        --bmg-bg-sunken: #101216;
        --bmg-canvas-bg: #26292f;
        --bmg-border: #2f333c;
        --bmg-text: #e8eaed;
        --bmg-text-muted: #9aa1ad;
        --bmg-accent: #4f83f1;
        --bmg-accent-text: #0b0d10;
        --bmg-accent-subtle: #1d2b4a;
        --bmg-shadow: 0 1px 3px rgb(0 0 0 / 0.5);
    }
}

/* An explicit dark theme, for hosts that manage the theme themselves. */
.bmg-editor.bmg-theme-dark {
    --bmg-bg: #16181d;
    --bmg-bg-subtle: #1e2128;
    --bmg-bg-sunken: #101216;
    --bmg-canvas-bg: #26292f;
    --bmg-border: #2f333c;
    --bmg-text: #e8eaed;
    --bmg-text-muted: #9aa1ad;
    --bmg-accent: #4f83f1;
    --bmg-accent-text: #0b0d10;
    --bmg-accent-subtle: #1d2b4a;
}

/* ---- Layout ---- */

.bmg-editor-body {
    display: flex;
    flex: 1 1 auto;
    min-height: 0;
}

.bmg-editor-stage {
    position: relative;
    flex: 1 1 auto;
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bmg-canvas-bg);
    overflow: hidden;
}

/* ---- Toolbar ---- */

.bmg-toolbar {
    display: flex;
    align-items: center;
    gap: var(--bmg-gap);
    min-height: var(--bmg-toolbar-height);
    padding: 6px 10px;
    background: var(--bmg-bg-subtle);
    border-bottom: 1px solid var(--bmg-border);
    flex-wrap: wrap;
}

.bmg-toolgroup {
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 2px;
    background: var(--bmg-bg);
    border: 1px solid var(--bmg-border);
    border-radius: var(--bmg-radius-sm);
}

.bmg-toolbar-spacer {
    flex: 1 1 auto;
}

.bmg-tool {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    height: 32px;
    padding: 0 6px;
    border: none;
    border-radius: var(--bmg-radius-sm);
    background: transparent;
    color: var(--bmg-text);
    cursor: pointer;
    transition: background var(--bmg-transition), color var(--bmg-transition);
}

.bmg-tool:hover:not(:disabled) {
    background: var(--bmg-bg-sunken);
}

.bmg-tool-active {
    background: var(--bmg-accent);
    color: var(--bmg-accent-text);
}

.bmg-tool-active:hover:not(:disabled) {
    background: var(--bmg-accent);
}

.bmg-tool:disabled,
.bmg-button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.bmg-zoom-value {
    min-width: 52px;
    font-variant-numeric: tabular-nums;
    font-size: 12px;
}

.bmg-button {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 32px;
    padding: 0 12px;
    border: 1px solid var(--bmg-border);
    border-radius: var(--bmg-radius-sm);
    background: var(--bmg-bg);
    color: var(--bmg-text);
    font: inherit;
    cursor: pointer;
    transition: background var(--bmg-transition), border-color var(--bmg-transition);
}

.bmg-button:hover:not(:disabled) {
    background: var(--bmg-bg-sunken);
}

.bmg-button-primary {
    background: var(--bmg-accent);
    border-color: var(--bmg-accent);
    color: var(--bmg-accent-text);
}

.bmg-button-primary:hover:not(:disabled) {
    filter: brightness(1.08);
    background: var(--bmg-accent);
}

.bmg-icon-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: none;
    border-radius: var(--bmg-radius-sm);
    background: transparent;
    color: var(--bmg-text-muted);
    cursor: pointer;
}

.bmg-icon-button:hover {
    background: var(--bmg-bg-sunken);
    color: var(--bmg-danger);
}

/* ---- Canvas ---- */

.bmg-canvas-host {
    position: relative;
    width: 100%;
    height: 100%;
    /* Not a flex container: the canvas is placed by its pan offset from the top-left corner, the same mapping the
       crop and selection overlays use, so the three always line up. The editor centres the image by panning. */
    overflow: hidden;
    /* The editor handles its own gestures; the browser must not scroll or zoom the page underneath. */
    touch-action: none;
    outline: none;
}

.bmg-canvas-host:focus-visible {
    outline: var(--bmg-focus-ring);
    outline-offset: -2px;
}

.bmg-canvas {
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    /* A checkerboard makes transparency obvious rather than looking like white. */
    background-color: #ffffff;
    background-image:
        linear-gradient(45deg, #d9dce1 25%, transparent 25%),
        linear-gradient(-45deg, #d9dce1 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #d9dce1 75%),
        linear-gradient(-45deg, transparent 75%, #d9dce1 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
    box-shadow: var(--bmg-shadow);
    /* Preserve hard pixel edges when zoomed in past 100%. */
    image-rendering: auto;
    transform-origin: 0 0;
}

/* ---- Crop overlay ---- */

.bmg-crop-overlay {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.bmg-crop-shade {
    position: absolute;
    background: rgb(0 0 0 / 0.5);
}

.bmg-crop-frame {
    position: absolute;
    border: 1px solid #ffffff;
    box-shadow: 0 0 0 1px rgb(0 0 0 / 0.35);
    pointer-events: auto;
    cursor: move;
}

/* Rule-of-thirds guides. */
.bmg-crop-frame::before,
.bmg-crop-frame::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0.45;
}

.bmg-crop-frame::before {
    background-image: linear-gradient(to right, transparent calc(33.33% - 0.5px), #fff calc(33.33% - 0.5px), #fff calc(33.33% + 0.5px), transparent calc(33.33% + 0.5px)),
                      linear-gradient(to right, transparent calc(66.66% - 0.5px), #fff calc(66.66% - 0.5px), #fff calc(66.66% + 0.5px), transparent calc(66.66% + 0.5px));
}

.bmg-crop-frame::after {
    background-image: linear-gradient(to bottom, transparent calc(33.33% - 0.5px), #fff calc(33.33% - 0.5px), #fff calc(33.33% + 0.5px), transparent calc(33.33% + 0.5px)),
                      linear-gradient(to bottom, transparent calc(66.66% - 0.5px), #fff calc(66.66% - 0.5px), #fff calc(66.66% + 0.5px), transparent calc(66.66% + 0.5px));
}

.bmg-crop-handle {
    position: absolute;
    /* Large enough to hit with a finger; 24px is the minimum comfortable touch target. */
    width: 24px;
    height: 24px;
    background: transparent;
    pointer-events: auto;
    cursor: pointer;
}

.bmg-crop-handle::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 12px;
    height: 12px;
    transform: translate(-50%, -50%);
    background: #ffffff;
    border: 1px solid rgb(0 0 0 / 0.5);
    border-radius: 2px;
}

.bmg-crop-handle:focus-visible {
    outline: var(--bmg-focus-ring);
}

.bmg-handle-topleft     { top: -12px; left: -12px; cursor: nwse-resize; }
.bmg-handle-top         { top: -12px; left: calc(50% - 12px); cursor: ns-resize; }
.bmg-handle-topright    { top: -12px; right: -12px; cursor: nesw-resize; }
.bmg-handle-left        { top: calc(50% - 12px); left: -12px; cursor: ew-resize; }
.bmg-handle-right       { top: calc(50% - 12px); right: -12px; cursor: ew-resize; }
.bmg-handle-bottomleft  { bottom: -12px; left: -12px; cursor: nesw-resize; }
.bmg-handle-bottom      { bottom: -12px; left: calc(50% - 12px); cursor: ns-resize; }
.bmg-handle-bottomright { bottom: -12px; right: -12px; cursor: nwse-resize; }

/* ---- Selection ---- */

.bmg-selection {
    position: absolute;
    border: 1px dashed var(--bmg-accent);
    background: rgb(37 99 235 / 0.08);
    pointer-events: none;
}

/* ---- Panel ---- */

.bmg-panel {
    display: flex;
    flex-direction: column;
    width: var(--bmg-panel-width);
    flex: 0 0 var(--bmg-panel-width);
    background: var(--bmg-bg);
    border-inline-start: 1px solid var(--bmg-border);
    overflow: hidden;
}

.bmg-panel-tabs {
    display: flex;
    overflow-x: auto;
    border-bottom: 1px solid var(--bmg-border);
    background: var(--bmg-bg-subtle);
    scrollbar-width: thin;
}

.bmg-panel-tab {
    flex: 0 0 auto;
    padding: 10px 12px;
    border: none;
    border-bottom: 2px solid transparent;
    background: transparent;
    color: var(--bmg-text-muted);
    font: inherit;
    font-size: 13px;
    cursor: pointer;
    white-space: nowrap;
    transition: color var(--bmg-transition), border-color var(--bmg-transition);
}

.bmg-panel-tab:hover {
    color: var(--bmg-text);
}

.bmg-panel-tab-active {
    color: var(--bmg-accent);
    border-bottom-color: var(--bmg-accent);
}

.bmg-panel-body {
    flex: 1 1 auto;
    overflow-y: auto;
    padding: 12px;
    outline: none;
}

.bmg-panel-body:focus-visible {
    outline: var(--bmg-focus-ring);
    outline-offset: -2px;
}

.bmg-fieldset {
    border: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.bmg-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.bmg-field-inline {
    flex-direction: row;
    align-items: center;
    gap: 8px;
}

.bmg-field-label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-size: 12px;
    color: var(--bmg-text-muted);
}

.bmg-field-value {
    font-variant-numeric: tabular-nums;
    color: var(--bmg-text);
}

.bmg-field-actions {
    display: flex;
    gap: 8px;
    margin-top: 4px;
}

.bmg-slider {
    width: 100%;
    accent-color: var(--bmg-accent);
    /* Keep the thumb comfortably draggable on touch screens. */
    height: 24px;
}

.bmg-slider:focus-visible {
    outline: var(--bmg-focus-ring);
    outline-offset: 2px;
}

.bmg-color {
    width: 100%;
    height: 32px;
    padding: 2px;
    border: 1px solid var(--bmg-border);
    border-radius: var(--bmg-radius-sm);
    background: var(--bmg-bg);
    cursor: pointer;
}

.bmg-select {
    width: 100%;
    height: 32px;
    padding: 0 8px;
    border: 1px solid var(--bmg-border);
    border-radius: var(--bmg-radius-sm);
    background: var(--bmg-bg);
    color: var(--bmg-text);
    font: inherit;
}

.bmg-readout {
    margin: 0 0 8px;
    font-size: 13px;
    color: var(--bmg-text-muted);
    font-variant-numeric: tabular-nums;
}

.bmg-note {
    opacity: 0.7;
}

.bmg-empty {
    margin: 0;
    padding: 16px 0;
    text-align: center;
    color: var(--bmg-text-muted);
}

/* ---- Filters ---- */

.bmg-filter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(84px, 1fr));
    gap: 8px;
}

.bmg-filter {
    padding: 10px 6px;
    border: 1px solid var(--bmg-border);
    border-radius: var(--bmg-radius-sm);
    background: var(--bmg-bg);
    color: var(--bmg-text);
    font: inherit;
    font-size: 12px;
    cursor: pointer;
    transition: border-color var(--bmg-transition), background var(--bmg-transition);
}

.bmg-filter:hover:not(:disabled) {
    background: var(--bmg-bg-sunken);
}

.bmg-filter-active {
    border-color: var(--bmg-accent);
    background: var(--bmg-accent-subtle);
}

/* ---- Layers and history ---- */

.bmg-layer-list,
.bmg-history-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.bmg-layer {
    display: flex;
    align-items: center;
    gap: 4px;
    border-radius: var(--bmg-radius-sm);
}

.bmg-layer-selected {
    background: var(--bmg-accent-subtle);
}

.bmg-layer-name,
.bmg-history-button {
    flex: 1 1 auto;
    padding: 7px 8px;
    border: none;
    border-radius: var(--bmg-radius-sm);
    background: transparent;
    color: inherit;
    font: inherit;
    text-align: start;
    cursor: pointer;
}

.bmg-layer-name:hover,
.bmg-history-button:hover {
    background: var(--bmg-bg-sunken);
}

.bmg-history-entry {
    border-radius: var(--bmg-radius-sm);
}

.bmg-history-current {
    background: var(--bmg-accent-subtle);
    font-weight: 600;
}

.bmg-history-future {
    opacity: 0.45;
}

/* ---- Drop zone ---- */

.bmg-dropzone {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: min(520px, 90%);
    min-height: 220px;
    border: 2px dashed var(--bmg-border);
    border-radius: var(--bmg-radius);
    background: var(--bmg-bg);
    transition: border-color var(--bmg-transition), background var(--bmg-transition);
}

.bmg-dropzone-active {
    border-color: var(--bmg-accent);
    background: var(--bmg-accent-subtle);
}

/* The input stays in the layout so it can receive focus, but is visually replaced by the label. */
.bmg-dropzone-input {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.bmg-dropzone-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 24px;
    text-align: center;
    color: var(--bmg-text-muted);
    pointer-events: none;
}

.bmg-dropzone-input:focus-visible + .bmg-dropzone-label {
    outline: var(--bmg-focus-ring);
    outline-offset: 4px;
    border-radius: var(--bmg-radius);
}

.bmg-dropzone-icon {
    color: var(--bmg-text-muted);
    opacity: 0.7;
}

.bmg-dropzone-text {
    font-size: 14px;
}

/* ---- Status ---- */

.bmg-busy {
    position: absolute;
    inset-block-start: 12px;
    inset-inline-end: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgb(0 0 0 / 0.65);
    color: #fff;
    font-size: 12px;
}

.bmg-spinner {
    width: 14px;
    height: 14px;
    border: 2px solid rgb(255 255 255 / 0.35);
    border-top-color: #fff;
    border-radius: 50%;
    animation: bmg-spin 700ms linear infinite;
}

@keyframes bmg-spin {
    to { transform: rotate(360deg); }
}

.bmg-message {
    position: absolute;
    inset-block-end: 12px;
    inset-inline-start: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: min(90%, 520px);
    padding: 10px 14px;
    border-radius: var(--bmg-radius-sm);
    background: var(--bmg-bg);
    border: 1px solid var(--bmg-border);
    box-shadow: var(--bmg-shadow);
    font-size: 13px;
}

.bmg-message-error {
    border-color: var(--bmg-danger);
    color: var(--bmg-danger);
}

.bmg-message-dismiss {
    border: none;
    background: transparent;
    color: inherit;
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
    padding: 0 2px;
}

/* ---- Accessibility helpers ---- */

.bmg-visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

.bmg-editor :focus-visible {
    outline: var(--bmg-focus-ring);
    outline-offset: 1px;
}

/* Prerendered output is inert until interactivity arrives; make that visible rather than looking broken. */
.bmg-prerender .bmg-toolbar,
.bmg-prerender .bmg-panel {
    opacity: 0.6;
    pointer-events: none;
}

/* ---- Responsive: stack the panel below the canvas on narrow screens ---- */

@media (max-width: 720px) {
    .bmg-editor-body {
        flex-direction: column;
    }

    .bmg-panel {
        width: 100%;
        flex: 0 0 auto;
        max-height: 45%;
        border-inline-start: none;
        border-block-start: 1px solid var(--bmg-border);
    }

    .bmg-toolbar {
        overflow-x: auto;
        flex-wrap: nowrap;
    }

    .bmg-tool {
        /* Comfortable touch targets on phones. */
        min-width: 40px;
        height: 40px;
    }
}

/* ---- Reduced motion ---- */

@media (prefers-reduced-motion: reduce) {
    .bmg-editor,
    .bmg-editor * {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }

    .bmg-spinner {
        animation: none;
        border-top-color: transparent;
    }
}

/* ---- High contrast ---- */

@media (forced-colors: active) {
    .bmg-editor {
        --bmg-border: CanvasText;
        --bmg-accent: Highlight;
        --bmg-accent-text: HighlightText;
    }

    .bmg-tool-active,
    .bmg-button-primary {
        forced-color-adjust: none;
        background: Highlight;
        color: HighlightText;
    }

    .bmg-crop-frame,
    .bmg-selection {
        border-color: CanvasText;
    }
}