:root {
  --bg-app: #16161a;
  --bg-rail: #101013;
  --bg-toolbar: #191a1e;
  --bg-stage: #0d0d10;
  --bg-panel: #191a1e;
  --bg-field: #0f0f12;
  --bg-statusbar: #101013;
  --line: rgba(255, 255, 255, 0.07);
  --line-strong: rgba(255, 255, 255, 0.13);
  --ink: #e9e8ee;
  --ink-dim: #97959f;
  --ink-faint: #66646d;
  --accent: #7c6bff;
  --accent-dim: rgba(124, 107, 255, 0.16);
  --good: #3fd692;
  --bad: #ff6b6b;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --radius: 8px;
  font-family: "Segoe UI Variable Text", "Segoe UI Variable", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

/* The [hidden] attribute must always win over component display rules —
   several components below (.stage-empty, .compare, etc.) set their own
   `display` unconditionally, which otherwise silences the UA default. */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg-app);
  color: var(--ink);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

body { font-size: 13px; line-height: 1.5; display: flex; flex-direction: column; height: 100vh; }

button, select, input { font-family: inherit; }

::selection { background: var(--accent-dim); }
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 6px; border: 2px solid transparent; background-clip: padding-box; }
::-webkit-scrollbar-track { background: transparent; }

/* ---------------------------------------------------------------- app shell */

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

.rail {
  width: 52px;
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 16px 0;
  background: var(--bg-rail);
  border-right: 1px solid var(--line);
  -webkit-app-region: drag;
}

.rail-mark {
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
  margin-bottom: 14px;
}

.rail-btn {
  -webkit-app-region: no-drag;
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  background: transparent;
  border: none;
  border-radius: 6px;
  border-left: 2px solid transparent;
  color: var(--ink-faint);
  cursor: pointer;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.rail-btn svg { width: 18px; height: 18px; }
.rail-btn:hover { color: var(--ink-dim); background: rgba(255,255,255,0.03); }
.rail-btn.is-active { color: var(--ink); background: rgba(255,255,255,0.045); border-left-color: var(--accent); }

.rail-spacer { flex: 1; }

.rail-status { -webkit-app-region: no-drag; padding-bottom: 2px; }
.rail-status .dot {
  display: block; width: 7px; height: 7px; border-radius: 50%;
  background: #4a4a52;
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.rail-status.ready .dot { background: var(--good); box-shadow: 0 0 6px 0 rgba(63, 214, 146, 0.5); }
.rail-status.busy .dot { background: var(--accent); box-shadow: 0 0 6px 0 rgba(124,107,255,0.6); animation: pulse 1.3s ease-in-out infinite; }
.rail-status.error .dot { background: var(--bad); box-shadow: 0 0 6px 0 rgba(255,107,107,0.5); }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

/* ---------------------------------------------------------------- main / toolbar */

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.toolbar {
  flex: 0 0 auto;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: var(--bg-toolbar);
  border-bottom: 1px solid var(--line);
  -webkit-app-region: drag;
}

.toolbar h1 { font-size: 13px; font-weight: 600; margin: 0; letter-spacing: 0.01em; }
.toolbar-actions { -webkit-app-region: no-drag; }

.seg { display: inline-flex; padding: 2px; border-radius: 7px; background: rgba(0,0,0,0.3); border: 1px solid var(--line); }
.seg-btn {
  border: none; background: transparent; color: var(--ink-dim);
  padding: 5px 12px; border-radius: 5px; font-size: 12px; cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}
.seg-btn:hover { color: var(--ink); }
.seg-btn.is-active { background: rgba(255,255,255,0.09); color: var(--ink); }

/* ---------------------------------------------------------------- workspace */

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

.stage {
  flex: 1;
  min-width: 0;
  position: relative;
  background: var(--bg-stage);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 28px 28px;
  background-position: -1px -1px;
  display: flex;
  flex-direction: column;
}

.stage[hidden] { display: none; }

.stage-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  cursor: pointer;
}

.empty-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-faint);
  border: 1px solid var(--line-strong);
  background: rgba(255,255,255,0.02);
}
.empty-icon svg { width: 20px; height: 20px; }

.empty-hint { color: var(--ink-faint); font-size: 11.5px; }

.ghost-btn {
  padding: 8px 16px;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--line-strong);
  color: var(--ink);
  font-size: 12.5px;
  cursor: pointer;
  transition: background 0.2s var(--ease);
}
.ghost-btn:hover { background: rgba(255,255,255,0.08); }
.ghost-btn:active { transform: scale(0.98); }

/* compare / before-after */

.compare { flex: 1; min-height: 0; padding: 18px; display: flex; flex-direction: column; }
.compare[hidden] { display: none; }

.compare-stage {
  position: relative;
  flex: 1;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  cursor: ew-resize;
  touch-action: none;
  --split: 50;
}

.checker {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(45deg, #2a2a30 25%, transparent 25%, transparent 75%, #2a2a30 75%),
    linear-gradient(45deg, #2a2a30 25%, #1c1c20 25%, #1c1c20 75%, #2a2a30 75%);
  background-size: 20px 20px;
  background-position: 0 0, 10px 10px;
}

.layer {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: contain;
  -webkit-user-drag: none;
  user-select: none;
}
/* Left of the handle shows the original ("Before"), right shows the result
   ("After") — matching the .tag-before / .tag-after label positions. */
.layer-original { clip-path: inset(0 calc(100% - var(--split) * 1%) 0 0); }
.layer-processed { clip-path: inset(0 0 0 calc(var(--split) * 1%)); }

/* The visible line is 2px, but the actual pointer hit-zone is much wider
   (and centered on the line via translateX) so the divider is easy to grab
   without pixel-precise aim. Dragging can also start anywhere on the image
   (see .compare-stage pointerdown in app.js) — the handle itself is just
   the visual affordance. */
.handle {
  position: absolute; top: 0; bottom: 0;
  left: calc(var(--split) * 1%);
  width: 40px;
  transform: translateX(-50%);
  display: flex; align-items: center; justify-content: center;
  cursor: ew-resize;
  touch-action: none;
}
.handle::before {
  content: ""; position: absolute; top: 0; bottom: 0; left: 50%; width: 2px;
  transform: translateX(-1px);
  background: rgba(255,255,255,0.7);
  transition: width 0.15s var(--ease), background 0.15s var(--ease);
}
.handle:hover::before, .handle.is-dragging::before {
  width: 3px;
  background: rgba(255,255,255,0.95);
}
.handle-grip {
  width: 30px; height: 30px;
  border-radius: 50%;
  background: rgba(20,20,24,0.85);
  border: 1px solid rgba(255,255,255,0.35);
  position: relative;
  z-index: 1;
  transition: transform 0.15s var(--ease), background 0.15s var(--ease);
}
.handle:hover .handle-grip, .handle.is-dragging .handle-grip {
  transform: scale(1.1);
  background: rgba(30,26,50,0.95);
  border-color: rgba(124,107,255,0.7);
}
.handle-grip::before, .handle-grip::after {
  content: ""; position: absolute; top: 50%; width: 5px; height: 5px;
  border-top: 1.4px solid rgba(255,255,255,0.75);
  border-right: 1.4px solid rgba(255,255,255,0.75);
  transform: translateY(-50%) rotate(-45deg);
}
.handle-grip::before { left: 7px; }
.handle-grip::after { right: 7px; transform: translateY(-50%) rotate(135deg); }

.tag {
  position: absolute; top: 10px;
  padding: 3px 9px;
  border-radius: 5px;
  background: rgba(10,10,12,0.65);
  border: 1px solid rgba(255,255,255,0.1);
  font-size: 10.5px;
  color: var(--ink-dim);
  pointer-events: none;
}
.tag-before { left: 10px; }
.tag-after { right: 10px; }

/* loading */

.stage-loading {
  flex: 1;
  display: flex; align-items: center; justify-content: center;
  gap: 10px;
  color: var(--ink-faint);
  font-size: 12px;
}
.stage-loading[hidden] { display: none; }

.spinner {
  width: 14px; height: 14px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.15);
  border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.stage-toolbar {
  flex: 0 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 10px;
  color: var(--ink-faint);
  font-size: 11.5px;
}

.mini-btn {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--line-strong);
  color: var(--ink-dim);
  border-radius: 6px;
  padding: 5px 11px;
  font-size: 11.5px;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}
.mini-btn:hover { background: rgba(255,255,255,0.09); color: var(--ink); }

/* batch list */

.batch-list { flex: 1; min-height: 0; display: flex; flex-direction: column; padding: 18px; }
.batch-list[hidden] { display: none; }
.batch-list-head { color: var(--ink-faint); font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 10px; }
.batch-list-body { flex: 1; overflow-y: auto; border: 1px solid var(--line); border-radius: 6px; background: rgba(0,0,0,0.15); }
.batch-row {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--ink-dim);
  border-bottom: 1px solid var(--line);
  font-family: "Cascadia Code", "Consolas", monospace;
}
.batch-row:last-child { border-bottom: none; }

/* ---------------------------------------------------------------- panel */

.panel {
  width: 280px;
  flex: 0 0 auto;
  background: var(--bg-panel);
  border-left: 1px solid var(--line);
  padding: 16px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.panel[hidden] { display: none; }

.panel-section { display: flex; flex-direction: column; gap: 8px; }
.panel-spacer { flex: 1; min-height: 12px; }

.divider { height: 1px; background: var(--line); margin: 14px 0; flex: 0 0 auto; }

.panel-label { font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-faint); }
.panel-hint { margin: 0; color: var(--ink-faint); font-size: 11px; }

.row-btn {
  width: 100%;
  padding: 8px 10px;
  border-radius: 6px;
  background: rgba(255,255,255,0.045);
  border: 1px solid var(--line-strong);
  color: var(--ink);
  font-size: 12px;
  text-align: left;
  cursor: pointer;
  transition: background 0.2s var(--ease);
}
.row-btn:hover { background: rgba(255,255,255,0.08); }

.path-line {
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 11px;
  color: var(--ink-faint);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 0 2px;
}
.path-line.has-value { color: var(--ink-dim); }

.full-select {
  width: 100%;
  background: var(--bg-field);
  border: 1px solid var(--line-strong);
  color: var(--ink);
  padding: 7px 9px;
  border-radius: 6px;
  font-size: 12px;
  outline: none;
}

.panel-field { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.panel-field span { color: var(--ink-dim); font-size: 12px; }
.panel-field select, .glass-input {
  background: var(--bg-field);
  border: 1px solid var(--line-strong);
  color: var(--ink);
  padding: 6px 9px;
  border-radius: 6px;
  font-size: 12px;
  outline: none;
  min-width: 118px;
}
.glass-input { min-width: 90px; }
.panel-field select:focus, .full-select:focus, .glass-input:focus { border-color: rgba(124,107,255,0.55); }

.swatch-row { display: flex; gap: 8px; }
.swatch-btn {
  width: 30px; height: 30px;
  border-radius: 7px;
  padding: 3px;
  background: transparent;
  border: 1px solid var(--line-strong);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: border-color 0.2s var(--ease), transform 0.15s var(--ease);
}
.swatch-btn:hover { transform: translateY(-1px); }
.swatch-btn.is-active { border-color: var(--accent); }
.swatch {
  width: 100%; height: 100%;
  border-radius: 4px;
  display: block;
}
.checker-swatch {
  background-image:
    linear-gradient(45deg, #3a3a42 25%, transparent 25%, transparent 75%, #3a3a42 75%),
    linear-gradient(45deg, #3a3a42 25%, #24242a 25%, #24242a 75%, #3a3a42 75%);
  background-size: 8px 8px;
  background-position: 0 0, 4px 4px;
}

.switch-row {
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer;
  font-size: 12px;
  color: var(--ink-dim);
}
.switch {
  width: 32px; height: 19px;
  border-radius: 999px;
  background: rgba(0,0,0,0.4);
  border: 1px solid var(--line-strong);
  position: relative;
  flex: 0 0 auto;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
}
.switch .knob {
  position: absolute; top: 1px; left: 1px;
  width: 15px; height: 15px;
  border-radius: 50%;
  background: var(--ink-faint);
  transition: transform 0.25s var(--ease), background 0.25s var(--ease);
}
.switch.is-on { background: rgba(124,107,255,0.5); border-color: rgba(124,107,255,0.65); }
.switch.is-on .knob { transform: translateX(13px); background: #fff; }

.primary-btn {
  margin-top: 14px;
  width: 100%;
  border: none;
  border-radius: 7px;
  padding: 10px 0;
  background: var(--accent);
  color: #fff;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.2s var(--ease), transform 0.15s var(--ease);
}
.primary-btn:hover { filter: brightness(1.08); }
.primary-btn:active { transform: scale(0.985); }
.primary-btn:disabled { opacity: 0.45; cursor: not-allowed; filter: none; }

/* ---------------------------------------------------------------- statusbar */

.statusbar {
  flex: 0 0 auto;
  height: 26px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
  background: var(--bg-statusbar);
  border-top: 1px solid var(--line);
  font-size: 11px;
  color: var(--ink-faint);
}

.statusbar-track {
  width: 90px;
  height: 3px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  overflow: hidden;
}
.statusbar-fill {
  height: 100%; width: 0%;
  background: var(--accent);
  transition: width 0.4s var(--ease);
}

.statusbar-text { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.statusbar-log {
  background: none; border: none; color: var(--ink-faint);
  font-size: 11px; display: flex; align-items: center; gap: 4px;
  cursor: pointer; padding: 3px;
}
.statusbar-log svg { width: 10px; height: 10px; transition: transform 0.25s var(--ease); }
.statusbar-log.is-open svg { transform: rotate(180deg); }

.log-drawer {
  position: fixed;
  left: 0; right: 0; bottom: 26px;
  max-height: 0;
  overflow-y: auto;
  background: rgba(10,10,12,0.97);
  border-top: 1px solid var(--line);
  transition: max-height 0.3s var(--ease);
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 11px;
  color: var(--ink-faint);
  z-index: 5;
}
.log-drawer.is-open { max-height: 180px; }
.log-drawer div { padding: 3px 14px; white-space: pre-wrap; word-break: break-word; }
.log-drawer div.is-error { color: var(--bad); }