/* ============================================================
   Web Imagine — Layout, components, panels, canvas
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--font-ui);
  font-size: var(--fs-base);
  color: var(--text);
  background: var(--bg-app);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
  user-select: none;
}
button, input, select, textarea { font: inherit; color: inherit; }
::selection { background: var(--accent-soft); }

/* Focus: no ugly UA ring for pointer use; tasteful accent ring for keyboard nav */
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
input:focus-visible, select:focus-visible, textarea:focus-visible { outline: none; }

/* ---------- App grid ---------- */
#app {
  height: 100vh;
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-rows: auto auto 1fr auto;
  grid-template-areas:
    "menu    menu    menu"
    "options options options"
    "tools   stage   panels"
    "status  status  status";
}
.menubar   { grid-area: menu; }
.optionsbar{ grid-area: options; }
.toolbar   { grid-area: tools; }
.stage     { grid-area: stage; }
.panels    { grid-area: panels; }
.statusbar { grid-area: status; }

/* ---------- Menu bar ---------- */
.menubar {
  display: flex; align-items: center; gap: var(--space-3);
  height: calc(var(--ctl-h) + 8px);
  padding: 0 var(--space-3);
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  -webkit-app-region: drag;
}
.brand {
  display: flex; align-items: center; gap: 7px;
  font-weight: 650; letter-spacing: .2px;
  color: var(--text);
  padding-right: var(--space-2);
}
.brand svg { color: var(--accent); }
.menus { display: flex; gap: 1px; }
.menu-btn {
  background: none; border: 0; cursor: pointer;
  padding: 5px 10px; border-radius: var(--radius-sm);
  color: var(--text-dim); font-size: var(--fs-base);
}
.menu-btn:hover, .menu-btn.open { background: var(--bg-hover); color: var(--text); }

/* dropdown menus */
.menu-pop {
  position: fixed; z-index: 1000; min-width: 230px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-2);
  padding: var(--space-1);
}
.menu-item {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
  padding: 6px 10px; border-radius: var(--radius-sm); cursor: pointer;
  color: var(--text); white-space: nowrap;
}
.menu-item:hover { background: var(--accent); color: var(--on-accent); }
.menu-item.disabled { color: var(--text-mute); pointer-events: none; }
.menu-item .sc { color: var(--text-mute); font-size: var(--fs-sm); font-family: var(--font-mono); }
.menu-item:hover .sc { color: var(--on-accent); opacity: .8; }
.menu-sep { height: 1px; background: var(--border); margin: var(--space-1) 6px; }

/* ---------- Options bar ---------- */
.optionsbar {
  display: flex; align-items: center; gap: var(--space-3);
  height: calc(var(--ctl-h) + 10px);
  padding: 0 var(--space-3);
  background: var(--bg-panel-2);
  border-bottom: 1px solid var(--border);
  overflow-x: auto; overflow-y: hidden;
}
.optionsbar::-webkit-scrollbar { height: 0; }
.opt-tool-name { font-weight: 600; color: var(--text); padding-right: var(--space-2); min-width: 90px; }
.opt-group { display: flex; align-items: center; gap: 6px; color: var(--text-dim); }
.opt-group > label { font-size: var(--fs-sm); color: var(--text-mute); }
.opt-sep { width: 1px; height: 20px; background: var(--border); }

/* ---------- Toolbar ---------- */
.toolbar {
  display: flex; flex-direction: column; gap: 2px; align-items: center;
  padding: var(--space-2) 6px;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  overflow-y: auto;
}
.tool-btn {
  width: calc(var(--ctl-h) + 6px); height: calc(var(--ctl-h) + 6px);
  display: grid; place-items: center;
  appearance: none; -webkit-appearance: none; padding: 0;
  background: none; border: 1px solid transparent; border-radius: var(--radius);
  color: var(--text-dim); cursor: pointer; position: relative;
}
.tool-btn:hover { background: var(--bg-hover); color: var(--text); }
.tool-btn.active { background: var(--accent); color: var(--on-accent); }
.tool-btn svg { width: 19px; height: 19px; display: block; }
.tool-btn[data-sc]::after {
  content: attr(data-sc); position: absolute; right: 2px; bottom: 1px;
  font-size: 8.5px; color: var(--text-mute);
}
.tool-btn.active[data-sc]::after { color: var(--on-accent); opacity: .75; }
.tool-sep { width: 60%; height: 1px; background: var(--border); margin: 4px 0; }
.tool-colors { margin-top: var(--space-2); display: grid; place-items: center; }

/* ---------- Stage / canvas ---------- */
.stage { position: relative; overflow: hidden; background: var(--bg-stage); }
.viewport {
  position: absolute; inset: 0; overflow: hidden;
  display: grid; place-items: center;
}
/* checkerboard sits on the host itself; the transparent canvas shows it through */
.canvas-host {
  position: relative;
  box-shadow: 0 0 0 1px var(--border-strong), var(--shadow-2);
  background-color: var(--canvas-checker-b);
  background-image:
    linear-gradient(45deg, var(--canvas-checker-a) 25%, transparent 25%),
    linear-gradient(-45deg, var(--canvas-checker-a) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--canvas-checker-a) 75%),
    linear-gradient(-45deg, transparent 75%, var(--canvas-checker-a) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}
.canvas-host canvas { display: block; position: absolute; top: 0; left: 0; image-rendering: pixelated; }
.canvas-host #main-canvas { position: relative; }
.canvas-host .overlay { pointer-events: none; image-rendering: auto; }

/* rulers */
:root { --ruler: 22px; }
.stage .ruler, .stage .ruler-corner { position: absolute; z-index: 5; }
.stage .ruler { background: var(--bg-panel-2); }
/* canvas is a replaced element, so left+right / top+bottom won't stretch it —
   give explicit calc() sizes so the rulers actually span the edges */
.stage .ruler-top { top: 0; left: var(--ruler); width: calc(100% - var(--ruler)); height: var(--ruler); cursor: ns-resize; }
.stage .ruler-left { top: var(--ruler); left: 0; width: var(--ruler); height: calc(100% - var(--ruler)); cursor: ew-resize; }
.stage .ruler-corner { top: 0; left: 0; width: var(--ruler); height: var(--ruler); background: var(--bg-panel); border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.stage:not(.rulers-on) .ruler, .stage:not(.rulers-on) .ruler-corner { display: none; }
.stage.rulers-on .viewport { top: var(--ruler); left: var(--ruler); }

.no-doc { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; }
.no-doc[hidden] { display: none; }
.no-doc-inner h1 { font-size: 30px; margin: 0 0 6px; letter-spacing: -.5px; }
.no-doc-inner p { color: var(--text-dim); margin: 0 0 var(--space-4); }
.no-doc-actions { display: flex; gap: var(--space-2); justify-content: center; margin-bottom: var(--space-4); }
.no-doc .hint { color: var(--text-mute); font-size: var(--fs-sm); }

/* ---------- Right panels ---------- */
.panels {
  width: 290px; min-width: 290px;
  display: flex; flex-direction: column;
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
  overflow-y: auto;
}
.panel { border-bottom: 1px solid var(--border); }
.panel-head {
  display: flex; align-items: center; gap: 6px;
  padding: 7px var(--space-3); cursor: pointer;
  font-weight: 600; font-size: var(--fs-sm); text-transform: uppercase;
  letter-spacing: .6px; color: var(--text-dim);
  user-select: none;
}
.panel-head:hover { color: var(--text); }
.panel-head .chev { transition: transform var(--transition); margin-left: auto; }
.panel.collapsed .chev { transform: rotate(-90deg); }
.panel.collapsed .panel-body { display: none; }
.panel-body { padding: var(--space-2) var(--space-3) var(--space-3); }

/* ---------- Generic controls ---------- */
.btn {
  height: var(--ctl-h); padding: 0 12px; border-radius: var(--radius);
  background: var(--bg-elevated); border: 1px solid var(--border-strong);
  color: var(--text); cursor: pointer; display: inline-flex; align-items: center; gap: 6px;
}
.btn:hover { background: var(--bg-hover); }
.btn.btn-accent { background: var(--accent); border-color: transparent; color: var(--on-accent); }
.btn.btn-accent:hover { background: var(--accent-strong); }
.btn.btn-sm { height: var(--ctl-h-sm); padding: 0 9px; font-size: var(--fs-sm); }
.btn.icon { width: var(--ctl-h); padding: 0; justify-content: center; }
.btn.icon.btn-sm { width: var(--ctl-h-sm); }
.btn:disabled { opacity: .4; pointer-events: none; }

.icon-btn {
  background: none; border: 0; cursor: pointer; color: var(--text-dim);
  appearance: none; -webkit-appearance: none; padding: 0;
  width: var(--ctl-h-sm); height: var(--ctl-h-sm); display: grid; place-items: center;
  border-radius: var(--radius-sm);
}
.icon-btn:hover { background: var(--bg-hover); color: var(--text); }
.icon-btn.on { color: var(--accent); }
.icon-btn svg { width: 15px; height: 15px; display: block; }

input[type="text"], input[type="number"], select, textarea {
  height: var(--ctl-h); padding: 0 8px; border-radius: var(--radius-sm);
  background: var(--bg-input); border: 1px solid var(--border-strong);
  color: var(--text-on-input); outline: none; min-width: 0;
}
textarea { height: auto; padding: 6px 8px; resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--accent); }
input[type="number"] { width: 64px; }
select { cursor: pointer; appearance: none; padding-right: 22px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10'%3E%3Cpath d='M2 4l3 3 3-3' fill='none' stroke='%23999' stroke-width='1.3'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 7px center;
}
label { font-size: var(--fs-sm); color: var(--text-dim); }

/* range sliders */
input[type="range"] {
  -webkit-appearance: none; appearance: none; height: 18px; background: none; cursor: pointer; min-width: 80px;
}
input[type="range"]::-webkit-slider-runnable-track { height: 4px; border-radius: 3px; background: var(--border-strong); }
input[type="range"]::-moz-range-track { height: 4px; border-radius: 3px; background: var(--border-strong); }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 13px; height: 13px; border-radius: 50%;
  background: var(--accent); margin-top: -4.5px; box-shadow: var(--shadow-1);
}
input[type="range"]::-moz-range-thumb { width: 13px; height: 13px; border: 0; border-radius: 50%; background: var(--accent); }

.field { display: flex; align-items: center; gap: 8px; margin-bottom: var(--space-2); }
.field > label { width: 78px; flex: none; }
.field .grow { flex: 1; }
.row { display: flex; align-items: center; gap: var(--space-2); }
.spread { justify-content: space-between; }

/* checkbox */
.check { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }
.check input { width: 15px; height: 15px; accent-color: var(--accent); }

/* segmented control */
.seg { display: inline-flex; background: var(--bg-input); border: 1px solid var(--border-strong); border-radius: var(--radius-sm); padding: 2px; gap: 2px; }
.seg button { background: none; border: 0; cursor: pointer; color: var(--text-dim); padding: 3px 9px; border-radius: 4px; font-size: var(--fs-sm); }
.seg button.on { background: var(--accent); color: var(--on-accent); }

/* number-with-suffix display */
.numval { font-family: var(--font-mono); color: var(--text); min-width: 34px; text-align: right; font-size: var(--fs-sm); }

/* color swatch button */
.swatch-btn { width: 26px; height: 22px; border-radius: var(--radius-sm); border: 1px solid var(--border-strong); cursor: pointer; padding: 0; background-clip: padding-box;
  background-image: linear-gradient(45deg,#999 25%,transparent 25%),linear-gradient(-45deg,#999 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#999 75%),linear-gradient(-45deg,transparent 75%,#999 75%);
  background-size: 10px 10px; background-position: 0 0,0 5px,5px -5px,-5px 0; }
.swatch-btn span { display: block; width: 100%; height: 100%; border-radius: inherit; }

/* color panel preview swatch */
.color-preview {
  display: block; width: 100%; height: 34px; margin-bottom: var(--space-3);
  border-radius: var(--radius-sm); border: 1px solid var(--border-strong);
  appearance: none; -webkit-appearance: none;
  cursor: pointer; padding: 0; overflow: hidden; background-clip: padding-box;
  background-image: linear-gradient(45deg,#999 25%,transparent 25%),linear-gradient(-45deg,#999 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#999 75%),linear-gradient(-45deg,transparent 75%,#999 75%);
  background-size: 12px 12px; background-position: 0 0,0 6px,6px -6px,-6px 0;
}
.color-preview span { display: block; width: 100%; height: 100%; }
.color-preview:hover { border-color: var(--accent); }

/* ---------- Foreground / background color widget ---------- */
.fgbg { position: relative; width: 46px; height: 46px; }
.fgbg .sw {
  position: absolute; width: 30px; height: 30px; border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong); cursor: pointer; box-shadow: var(--shadow-1);
}
.fgbg .fg { top: 0; left: 0; z-index: 2; }
.fgbg .bg { bottom: 0; right: 0; z-index: 1; }
.fgbg .mini { position: absolute; background: none; border: 0; cursor: pointer; color: var(--text-dim); padding: 0; }
.fgbg .swap { top: -2px; right: -2px; }
.fgbg .reset { bottom: -2px; left: -2px; }
.fgbg .mini svg { width: 13px; height: 13px; }
.fgbg .mini:hover { color: var(--text); }

/* ---------- Layers panel ---------- */
.layer-toolbar { display: flex; gap: 2px; margin-top: var(--space-2); padding-top: var(--space-2); border-top: 1px solid var(--border); }
.layer-list { display: flex; flex-direction: column; gap: 2px; max-height: 320px; overflow-y: auto; }
.layer-row {
  display: flex; align-items: center; gap: 7px; padding: 4px 6px;
  border-radius: var(--radius-sm); cursor: pointer; border: 1px solid transparent;
}
.layer-row:hover { background: var(--bg-hover); }
.layer-row.active { background: var(--accent-soft); border-color: var(--accent); }
.layer-row.drop-above { box-shadow: 0 -2px 0 var(--accent); }
.layer-row.drop-below { box-shadow: 0 2px 0 var(--accent); }
.layer-row.drop-into { outline: 2px solid var(--accent); outline-offset: -2px; background: var(--accent-soft); }
.layer-eye { flex: none; }
.layer-thumb {
  width: 34px; height: 34px; flex: none; border-radius: 4px; border: 1px solid var(--border-strong);
  background-image: linear-gradient(45deg,#777 25%,transparent 25%),linear-gradient(-45deg,#777 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#777 75%),linear-gradient(-45deg,transparent 75%,#777 75%);
  background-size: 10px 10px; background-position: 0 0,0 5px,5px -5px,-5px 0; object-fit: contain;
}
.layer-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: var(--fs-sm); }
.layer-name input { height: var(--ctl-h-sm); font-size: var(--fs-sm); width: 100%; }
.layer-row.locked .layer-name::after { content: " 🔒"; opacity: .6; }
.layer-meta { font-size: 10px; color: var(--text-mute); }
.layer-color-dot { width: 7px; height: 7px; border-radius: 50%; flex: none; }

/* ---------- Swatches ---------- */
.swatches { display: grid; grid-template-columns: repeat(10, 1fr); gap: 4px; }
.swatches .sw { aspect-ratio: 1; border-radius: 4px; border: 1px solid var(--border); cursor: pointer; }
.swatches .sw:hover { transform: scale(1.12); border-color: var(--accent); }
.subhead { font-size: 10px; text-transform: uppercase; letter-spacing: .5px; color: var(--text-mute); margin: var(--space-2) 0 6px; }

/* ---------- History panel ---------- */
.history-list { display: flex; flex-direction: column; gap: 1px; max-height: 240px; overflow-y: auto; }
.history-item { display: flex; align-items: center; gap: 7px; padding: 4px 8px; border-radius: var(--radius-sm); cursor: pointer; font-size: var(--fs-sm); color: var(--text-dim); }
.history-item:hover { background: var(--bg-hover); }
.history-item.current { background: var(--accent-soft); color: var(--text); }
.history-item.future { opacity: .45; }
.history-item svg { width: 13px; height: 13px; flex: none; }

/* ---------- Status bar ---------- */
.statusbar {
  display: flex; align-items: center; gap: var(--space-4);
  height: 26px; padding: 0 var(--space-3);
  background: var(--bg-panel); border-top: 1px solid var(--border);
  font-size: var(--fs-sm); color: var(--text-dim); font-family: var(--font-mono);
}
.statusbar .zoom-ctl { display: flex; align-items: center; gap: 4px; }
.statusbar .zoom-ctl input { width: 56px; height: var(--ctl-h-sm); text-align: center; }
.statusbar .grow { flex: 1; }
.statusbar .st { white-space: nowrap; }

/* ---------- Modal / dialogs ---------- */
.modal-root { position: fixed; inset: 0; z-index: 2000; display: grid; place-items: center; background: #0007; }
.modal-root[hidden] { display: none; }
.dialog {
  background: var(--bg-panel); border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-2);
  min-width: 320px; max-width: 92vw; max-height: 90vh; overflow: auto;
}
.dialog-head { display: flex; align-items: center; justify-content: space-between; padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--border); }
.dialog-head h2 { margin: 0; font-size: var(--fs-lg); }
.dialog-body { padding: var(--space-4); }
.dialog-foot { display: flex; justify-content: flex-end; gap: var(--space-2); padding: var(--space-3) var(--space-4); border-top: 1px solid var(--border); }

/* color picker dialog */
.cp { display: flex; gap: var(--space-4); }
.cp-sv { width: 220px; height: 220px; border-radius: var(--radius); position: relative; cursor: crosshair; flex: none;
  background: linear-gradient(to top, #000, transparent), linear-gradient(to right, #fff, transparent); }
.cp-sv .knob, .cp-hue .knob, .cp-alpha .knob { position: absolute; width: 14px; height: 14px; border-radius: 50%; border: 2px solid #fff; box-shadow: 0 0 0 1px #0008, var(--shadow-1); transform: translate(-50%,-50%); pointer-events: none; }
.cp-hue { width: 16px; height: 220px; border-radius: 8px; position: relative; cursor: pointer; flex: none;
  background: linear-gradient(to bottom,#f00,#ff0,#0f0,#0ff,#00f,#f0f,#f00); }
.cp-hue .knob { left: 50%; }
.cp-alpha { width: 16px; height: 220px; border-radius: 8px; position: relative; cursor: pointer; flex: none;
  background-image: linear-gradient(45deg,#999 25%,transparent 25%),linear-gradient(-45deg,#999 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#999 75%),linear-gradient(-45deg,transparent 75%,#999 75%);
  background-size: 10px 10px; background-position: 0 0,0 5px,5px -5px,-5px 0; }
.cp-alpha .grad { position: absolute; inset: 0; border-radius: 8px; }
.cp-alpha .knob { left: 50%; }
.cp-fields { display: flex; flex-direction: column; gap: var(--space-2); min-width: 150px; }
.cp-preview { height: 34px; border-radius: var(--radius-sm); border: 1px solid var(--border-strong); }
.cp-fields .field > label { width: 30px; }
.cp-fields input { width: 100%; }

/* preview / adjustment dialog graph */
.graph { background: var(--bg-input); border: 1px solid var(--border-strong); border-radius: var(--radius-sm); display: block; cursor: crosshair; }

/* utility */
.muted { color: var(--text-mute); }
.scrollable { overflow: auto; }
[hidden] { display: none !important; }

/* scrollbars */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 6px; border: 2px solid transparent; background-clip: padding-box; }
::-webkit-scrollbar-thumb:hover { background: var(--text-mute); background-clip: padding-box; }
::-webkit-scrollbar-track { background: transparent; }

/* marching ants overlay handled on overlay canvas; cursor helpers */
.stage.cursor-cross #viewport { cursor: crosshair; }
.stage.cursor-grab #viewport { cursor: grab; }
.stage.cursor-grabbing #viewport { cursor: grabbing; }
.stage.cursor-move #viewport { cursor: move; }
.stage.cursor-zoom-in #viewport { cursor: zoom-in; }
.stage.cursor-zoom-out #viewport { cursor: zoom-out; }
.stage.cursor-text #viewport { cursor: text; }
.stage.cursor-none #viewport { cursor: none; }