/* ── Image Merger v3 — Dark Studio ── */

/* Override site globals for this page */
html {
  background: #080a0b !important;
}
body {
  background: #080a0b !important;
  padding: 0 !important;
}

/* Hide the site wrapper's nav/header/footer — replaced by im-appbar */
body > .wrapper > .nav,
body > .wrapper > .header,
body > .wrapper > .foot {
  display: none;
}
body > .wrapper {
  max-width: unset;
  padding: 0;
  margin: 0;
  background: transparent;
}

/* ── App shell ── */
.im-app {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 14px;
  color: #c8c8c8;
  -webkit-font-smoothing: antialiased;
  background: #080a0b;
  position: fixed;
  inset: 0;
  overflow: hidden;
}

/* ── Utility ── */
.im-hidden {
  display: none !important;
}
.im-hint {
  color: #777;
  font-size: 0.82em;
}
.im-hint-small {
  color: #444;
  font-size: 0.75em;
}
.im-log-warn {
  color: #ffaa44;
}
.im-log-ok {
  color: springgreen;
}

/* ── App bar ── */
.im-appbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  height: 44px;
  padding: 0 1em;
  background: rgba(8, 10, 11, 0.92);
  border-bottom: 1px solid #141516;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  gap: 0.6em;
}

.im-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.3em;
  font-size: 0.74em;
}

.im-breadcrumb a {
  color: #3e3e3e;
  text-decoration: none;
  transition: color 0.15s;
}
.im-breadcrumb a:hover {
  color: #888;
}

.im-bsep {
  color: #222;
  font-size: 0.85em;
}
.im-breadcrumb span {
  color: #555;
}

.im-apptitle {
  margin-left: auto;
  font-size: 0.78em;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: springgreen;
  opacity: 0.7;
}

/* ── Panel wrap ── */
#panel-wrap {
  position: fixed;
  top: 0;
  right: 0;
  width: 340px;
  height: 100%;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: rgba(12, 14, 16, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 300;
  transform: translateX(0);
  transition: transform 0.32s cubic-bezier(0.16, 1, 0.3, 1);
}
#panel-wrap.im-panel-hidden {
  transform: translateX(100%);
}

/* ── Panel toggle FAB ── */
#btn-panel-toggle {
  position: fixed;
  top: 0.6rem;
  right: 0.6rem;
  z-index: 310;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  background: rgba(12, 14, 16, 0.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #e8eaf0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: background 0.2s;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}
#btn-panel-toggle:hover {
  background: rgba(40, 44, 52, 0.92);
}
body.im-panel-open #btn-panel-toggle svg {
  transform: rotate(180deg);
}

/* ── Made-by credit (drawer footer) ── */
.im-made-by {
  flex: 0 0 auto;
  padding: 0.8rem 1rem 1rem;
  font-size: 0.82em;
  color: #8a8f99;
  text-align: center;
  border-top: 1px solid #1a1c1e;
}
.im-made-by a {
  color: #cdd2db;
  text-decoration: none;
  font-weight: 600;
}
.im-made-by a:hover {
  color: springgreen;
}
.im-heart {
  color: #ff4d6d;
  vertical-align: -2px;
  margin: 0 1px;
}

/* ── Workflow ── */
.im-workflow {
  flex: 1 1 auto;
  min-height: 0; /* allow the accordion to scroll instead of growing the panel */
  overflow-y: auto;
  /* Clear the floating top-right toggle FAB, but inside the scroll area so it scrolls
     away -- a fixed panel padding-top would permanently eat height (precious on mobile
     while painting). */
  padding-top: 2.8rem;
  padding-bottom: 1em;
  scrollbar-width: thin;
  scrollbar-color: #181818 transparent;
}

/* ── Accordion step ── */
.im-step {
  border-bottom: 1px solid #111213;
  position: relative;
  transition: background 0.3s;
}

.im-step.im-step-open {
  background: rgba(0, 255, 127, 0.012);
}

.im-step-hd {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.9em;
  padding: 0 1.2em;
  min-height: 58px;
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  text-align: left;
  position: relative;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

/* Large decorative step-number watermark */
.im-step-hd::before {
  content: attr(data-num);
  position: absolute;
  right: 0.5em;
  top: 50%;
  transform: translateY(-50%);
  font-size: 3.8em;
  font-weight: 900;
  font-family: monospace;
  color: rgba(255, 255, 255, 0.022);
  pointer-events: none;
  line-height: 1;
  letter-spacing: -0.05em;
}

/* Active left-edge indicator */
.im-step.im-step-open .im-step-hd::after {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: springgreen;
  box-shadow: 0 0 10px rgba(0, 255, 127, 0.55);
  border-radius: 1px;
}

.im-snum {
  font-family: monospace;
  font-size: 0.7em;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #252525;
  flex: 0 0 auto;
  min-width: 2em;
  transition: color 0.2s;
}

.im-step.im-step-open .im-snum {
  color: springgreen;
}

.im-step-titles {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.12em;
  min-width: 0;
}

.im-slbl {
  font-size: 0.82em;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: #484848;
  transition: color 0.2s;
}

.im-step.im-step-open .im-slbl {
  color: #d4d4d4;
}

.im-smeta {
  font-size: 0.7em;
  color: #2c2c2c;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.2s;
}

.im-step.im-step-open .im-smeta {
  color: #555;
}
.im-smeta.im-ok {
  color: springgreen;
}

.im-sicon {
  font-size: 0.7em;
  color: #2a2a2a;
  transition:
    transform 0.25s,
    color 0.2s;
  flex: 0 0 auto;
}

.im-step.im-step-open .im-sicon {
  transform: rotate(180deg);
  color: rgba(0, 255, 127, 0.5);
}

/* Locked state */
.im-step.im-step-locked .im-step-hd {
  cursor: default;
  pointer-events: none;
  opacity: 0.28;
}

/* ── Step body — grid trick for smooth open/close ── */
.im-step-bd {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.38s cubic-bezier(0.16, 1, 0.3, 1);
}

.im-step.im-step-open .im-step-bd {
  grid-template-rows: 1fr;
}

.im-step-inner {
  overflow: hidden;
  min-height: 0;
}

/* ── Session row ── */
.im-session-row {
  display: flex;
  gap: 0.5em;
  padding: 0.5em 1em 0;
  align-items: center;
}
.im-session-status {
  font-size: 0.72em;
  color: #555;
  padding: 0.2em 1em;
}
.im-session-confirm {
  display: flex;
  gap: 0.5em;
  align-items: center;
  flex-wrap: wrap;
  padding: 0.5em 1em;
  margin: 0.4em 1em 0;
  font-size: 0.78em;
  color: #888;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid #111;
  border-radius: 0.4em;
}

/* ── Upload zone ── */
.im-upload-zone {
  position: relative;
  margin: 1em;
  border: 1.5px dashed #1e2022;
  border-radius: 0.8em;
  padding: 2.2em 1em;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35em;
  cursor: pointer;
  transition:
    border-color 0.2s,
    background 0.2s,
    box-shadow 0.2s;
  background: rgba(255, 255, 255, 0.012);
}

.im-upload-zone:hover {
  border-color: rgba(0, 255, 127, 0.35);
  background: rgba(0, 255, 127, 0.03);
}

/* Dragging image files over the zone -> "drop here" green highlight. */
.im-upload-zone.im-uz-drag {
  border-color: springgreen;
  background: rgba(0, 255, 127, 0.1);
  box-shadow: inset 0 0 0 2px rgba(0, 255, 127, 0.25);
}
.im-upload-zone.im-uz-drag .im-uz-icon,
.im-upload-zone.im-uz-drag .im-uz-label {
  color: springgreen;
}

.im-upload-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.im-uz-icon {
  font-size: 2em;
  color: #2a2a2a;
  line-height: 1;
}
.im-uz-label {
  font-size: 0.88em;
  color: #888;
}
.im-uz-hint {
  font-size: 0.7em;
  color: #323232;
}

/* ── Filmstrip ── */
.im-film-wrap {
  padding: 0 1em;
}

.im-rank-list {
  display: flex;
  flex-direction: row;
  gap: 0.55em;
  overflow-x: auto;
  padding: 0.6em 0 0.5em;
  list-style: none;
  margin: 0;
  scrollbar-width: thin;
  scrollbar-color: #181818 transparent;
  -webkit-overflow-scrolling: touch;
}

.im-rank-list::-webkit-scrollbar {
  height: 3px;
}
.im-rank-list::-webkit-scrollbar-thumb {
  background: #181818;
  border-radius: 2px;
}

.im-rank-item {
  flex: 0 0 82px;
  width: 82px;
  position: relative;
  border-radius: 0.45em;
  overflow: hidden;
  border: 1.5px solid #1a1b1c;
  background: #101112;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
  transition: border-color 0.15s;
}

.im-rank-item.dragging {
  opacity: 0.35;
}
.im-rank-item.drag-over {
  border-color: springgreen;
}
.im-rank-item.active-paint {
  border-color: springgreen;
  box-shadow: 0 0 0 1px rgba(0, 255, 127, 0.2);
}
.im-rank-item.dragging {
  opacity: 0.45;
  border-color: springgreen;
  z-index: 10;
}

.im-rank-thumb {
  width: 82px;
  height: 82px;
  object-fit: cover;
  display: block;
  pointer-events: none; /* prevent native browser image long-press menu */
  -webkit-user-drag: none;
}

/* Rank badge — top-left overlay */
.im-rank-badge {
  position: absolute;
  top: 3px;
  left: 3px;
  background: rgba(0, 0, 0, 0.75);
  color: springgreen;
  font-size: 0.6em;
  font-weight: 700;
  padding: 1px 4px;
  border-radius: 3px;
  line-height: 1.4;
  z-index: 2;
  pointer-events: none;
}

/* Encoding state on the thumbnail itself */
.im-rank-thumb.im-yolo-pending {
  filter: grayscale(1) brightness(0.45);
  transition: filter 0.3s;
}
.im-rank-thumb.im-yolo-encoding {
  animation: thumb-encode 1.1s ease-in-out infinite;
}
.im-rank-thumb.im-yolo-encoded {
  filter: none;
  transition: filter 0.3s;
  animation: none;
}
.im-rank-thumb.im-yolo-failed {
  filter: sepia(1) saturate(3) hue-rotate(300deg) brightness(0.6);
  animation: none;
}

/* Collab join placeholder — image not yet received */
.im-rank-thumb.im-rank-thumb-pending {
  background: #2a2c2e;
  animation: thumb-encode 1.5s ease-in-out infinite;
}

@keyframes thumb-encode {
  0%,
  100% {
    filter: grayscale(1) brightness(0.45);
  }
  50% {
    filter: grayscale(0) brightness(1);
  }
}

/* Invisible full-card tap target for "edit mask" */
.im-rank-edit-btn.im-rank-edit-overlay {
  position: absolute;
  inset: 0;
  bottom: 18px;
  opacity: 0;
  cursor: pointer;
  border: none;
  background: none;
  z-index: 1;
  touch-action: manipulation;
}

/* Name strip */
.im-rank-name {
  display: block;
  font-size: 0.58em;
  color: #404040;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 2px 4px;
  background: #0c0d0e;
  height: 18px;
  line-height: 14px;
}

.im-rank-item.active-paint .im-rank-name {
  color: rgba(0, 255, 127, 0.6);
}

/* Hide + Remove buttons — stacked bottom-right */
.im-rank-btn-group {
  position: absolute;
  bottom: 22px;
  right: 2px;
  z-index: 3;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.im-rank-edit-btn.im-film-hide,
.im-rank-edit-btn.im-film-rm {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border-radius: 4px;
  cursor: pointer;
  border: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: opacity 0.15s;
}

.im-rank-edit-btn.im-film-hide {
  background: rgba(0, 0, 0, 0.65);
  color: #666;
}

.im-rank-edit-btn.im-film-hide:hover {
  color: #aaa;
}

.im-rank-edit-btn.im-film-rm {
  background: rgba(0, 0, 0, 0.65);
  color: #cc3344;
}

.im-rank-edit-btn.im-film-rm:hover {
  color: #ff6680;
}

.im-film-hint {
  font-size: 0.68em;
  color: #252525;
  margin: 0 0 0.6em;
  text-align: center;
}

/* ── Config row ── */
.im-cfg-row {
  display: flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.4em 1em 0.7em;
  flex-wrap: wrap;
}

.im-cfg-lbl {
  font-size: 0.75em;
  color: #3c3c3c;
  white-space: nowrap;
}

.im-preset-select {
  flex: 1 1 12em;
  min-width: 0;
}
.im-slides-num {
  width: 3.4em;
}

/* Auto-segment quick control — mobile only (desktop uses the advanced checkbox). */
.im-yolo-mobile {
  display: none;
  align-items: center;
  gap: 0.5em;
  padding: 0 1em 0.5em;
}
@media (max-width: 500px) {
  .im-yolo-mobile {
    display: flex;
  }
}

.im-cfg-num {
  width: 4.8em;
  background: #0e0f10;
  border: 1px solid #1a1b1c;
  border-radius: 0.4em;
  padding: 0.35em 0.5em;
  color: #aaa;
  font-size: 0.84em;
  text-align: center;
}

.im-cfg-x {
  font-size: 0.75em;
  color: #252525;
}
.im-cfg-px {
  font-size: 0.72em;
  color: #2c2c2c;
}

.im-adv-toggle {
  font-size: 0.72em;
  margin-left: auto;
  letter-spacing: 0.04em;
}

/* ── Advanced panel ── */
.im-adv-panel {
  margin: 0 1em 0.8em;
  padding: 0.8em;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid #111213;
  border-radius: 0.5em;
}

/* ── YOLO toggle row ── */
.im-yolo-toggle-row {
  display: flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.8em 1em 0;
  font-size: 0.82em;
  color: #888;
}

.im-yolo-toggle-row label {
  cursor: pointer;
}

/* ── General inputs ── */
.im-field {
  display: flex;
  flex-direction: column;
  gap: 0.35em;
}

.im-field label {
  font-size: 0.78em;
  color: #4a4a4a;
}

.im-field input[type="number"],
.im-select {
  background: #0e0f10;
  border: 1px solid #1a1b1c;
  border-radius: 0.4em;
  padding: 0.4em 0.6em;
  color: #bbb;
  font-size: 0.86em;
}

.im-field input[type="color"] {
  width: 3em;
  height: 2em;
  border: 1px solid #1a1b1c;
  border-radius: 0.4em;
  background: none;
  cursor: pointer;
}

.im-fill-row {
  display: flex;
  align-items: center;
  gap: 0.3em;
}

.im-fill-checker {
  flex-shrink: 0;
  width: 2em;
  height: 2em;
  border: 1px solid #1a1b1c;
  border-radius: 0.4em;
  cursor: pointer;
  padding: 0;
  background: repeating-conic-gradient(#3c3c3c 0% 25%, #2a2a2a 0% 50%) 0 0 / 8px 8px;
  transition: border-color 0.15s;
}

.im-fill-checker:hover {
  border-color: #555;
}

.im-fill-checker.im-active {
  border-color: springgreen;
  outline: 1px solid springgreen;
}

.im-fill-checker.im-active ~ #cfg-fill {
  opacity: 0.3;
}

.im-config-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.9em;
}

.im-slider-row {
  display: flex;
  align-items: center;
  gap: 0.45em;
}

.im-slider-row input[type="range"] {
  flex: 1;
  accent-color: springgreen;
}
.im-rng-lbl {
  font-size: 0.72em;
  color: #383838;
  min-width: 2.2em;
}
.im-rng-val {
  font-size: 0.72em;
  color: #5a5a5a;
  min-width: 2.8em;
}

/* ── Buttons ── */
.im-btn {
  background: #111213;
  border: 1px solid #202224;
  border-radius: 0.45em;
  color: #aaa;
  padding: 0.5em 1.1em;
  cursor: pointer;
  font-size: 0.88em;
  letter-spacing: 0.02em;
  transition:
    background 0.15s,
    color 0.15s,
    border-color 0.15s;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  white-space: nowrap;
}

.im-btn:hover:not(:disabled) {
  background: #1a1c1e;
  color: springgreen;
  border-color: #303234;
}

.im-btn:disabled {
  opacity: 0.28;
  cursor: not-allowed;
}

/* Applied to a <label> button (which can't use :disabled) to make it inert. */
.im-btn-disabled {
  opacity: 0.28;
  cursor: not-allowed;
  pointer-events: none;
}

.im-btn-sm {
  font-size: 0.76em;
  padding: 0.38em 0.85em;
}

.im-btn-danger:hover:not(:disabled) {
  color: #ff6680;
  border-color: rgba(255, 102, 128, 0.4);
}

/* ── Painter step ── */
.im-painter-inner {
  display: flex;
  flex-direction: column;
}

.im-yolo-bar {
  display: flex;
  align-items: center;
  gap: 0.65em;
  padding: 0.55em 1em;
  border-bottom: 1px solid #0e0f10;
  flex-wrap: wrap;
}

.im-yolo-worker-count {
  font-size: 0.73em;
  color: #3c3c3c;
}
.im-yolo-status {
  font-size: 0.76em;
  color: #484848;
}

.im-btn.im-yolo-active {
  color: springgreen;
  border-color: rgba(0, 255, 127, 0.4);
}

.im-paint-nav {
  display: flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.45em 0.8em;
  border-bottom: 1px solid #0e0f10;
}

.im-paint-nav-c {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.08em;
  min-width: 0;
}

.im-paint-name {
  font-size: 0.8em;
  color: #aaa;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 16em;
}

.im-paint-idx {
  font-size: 0.68em;
  color: #383838;
}

.im-scalebar {
  display: flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.35em 1em;
  font-size: 0.78em;
  color: #777;
  border-bottom: 1px solid #0a0b0c;
  flex-wrap: wrap;
}

.im-scale-auto-lbl {
  cursor: pointer;
  color: #4a4a4a;
}

.im-scale-input {
  width: 3.8em;
  background: #0e0f10;
  border: 1px solid #1a1b1c;
  border-radius: 0.3em;
  padding: 0.15em 0.3em;
  color: #bbb;
  font-size: 0.9em;
}

.im-scale-input:disabled {
  opacity: 0.28;
}

.im-zoom-lbl {
  color: #3c3c3c;
}
.im-zoom-lbl strong {
  color: #666;
}

.im-scale-preview {
  opacity: 0.5;
  border: 1px solid #2a2a2a;
  border-radius: 0.2em;
  image-rendering: pixelated;
}

.im-canvas-wrap {
  position: relative;
  display: block;
  cursor: crosshair;
  background: #0c0d0e;
  touch-action: pan-y; /* a vertical drag scrolls the drawer; a tap paints */
}

#paint-canvas,
#mask-canvas {
  display: block;
  max-width: 100%;
}

#mask-canvas {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
}

.im-paint-tools {
  display: flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.55em 0.8em;
  border-top: 1px solid #0e0f10;
  flex-wrap: wrap;
}

.im-paint-hint {
  font-size: 0.7em;
  color: #2c2c2c;
  margin-left: auto;
}

/* ── Sim canvas — always-visible background ── */
#sim-wrap {
  position: fixed;
  inset: 0;
  z-index: 1;
  background: #080a0b;
}

.im-recenter-rim {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 60;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(12, 14, 16, 0.72);
  border: 1px solid springgreen;
  color: springgreen;
  cursor: pointer;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 0 12px rgba(0, 255, 127, 0.25);
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.25s ease,
    background 0.2s;
}
.im-recenter-rim.im-shown {
  opacity: 1;
  pointer-events: auto;
}
.im-recenter-rim:hover {
  background: rgba(0, 255, 127, 0.18);
}

#sim-canvas-outer {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  line-height: 0;
  overflow: visible;
}

#sim-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* ── Sim HUD ── */
#sim-hud {
  position: fixed;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  max-width: calc(100vw - 2rem);
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.9rem;
  border-radius: 2em;
  background: rgba(12, 14, 16, 0.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #e8eaf0;
  white-space: nowrap;
}

.im-sim-status {
  font-size: 0.76em;
  color: #888;
  /* Truncate a long status (e.g. an error) instead of pushing the buttons off
     the viewport-capped HUD -- the buttons must always stay reachable. */
  flex: 0 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.im-sim-btns {
  display: flex;
  gap: 0.45em;
  align-items: center;
  flex-shrink: 0;
}

.im-rot-lbl {
  display: flex;
  align-items: center;
  gap: 0.3em;
  font-size: 0.76em;
  color: #3c3c3c;
  cursor: pointer;
  white-space: nowrap;
}

/* Merge button — glowing CTA */
#btn-merge {
  background: transparent;
  border: 1.5px solid springgreen;
  color: springgreen;
  font-size: 0.8em;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.45em 1.5em;
  border-radius: 0.45em;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition:
    background 0.2s,
    box-shadow 0.2s;
  animation: merge-glow 2.2s ease-in-out infinite;
}

#btn-merge:hover:not(:disabled) {
  background: rgba(0, 255, 127, 0.1);
  animation: none;
  box-shadow: 0 0 18px rgba(0, 255, 127, 0.55);
}

@keyframes merge-glow {
  0%,
  100% {
    box-shadow: 0 0 6px rgba(0, 255, 127, 0.25);
  }
  50% {
    box-shadow: 0 0 16px rgba(0, 255, 127, 0.6);
  }
}

/* Download button */
#btn-download {
  background: rgba(0, 255, 127, 0.08);
  border: 1.5px solid rgba(0, 255, 127, 0.35);
  color: springgreen;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.4em 0.55em;
}

#btn-download:hover:not(:disabled) {
  background: rgba(0, 255, 127, 0.15);
  color: springgreen;
  border-color: springgreen;
  box-shadow: 0 0 12px rgba(0, 255, 127, 0.35);
}

/* ── Scrollbar ── */
.im-workflow::-webkit-scrollbar {
  width: 3px;
}
.im-workflow::-webkit-scrollbar-thumb {
  background: #141516;
  border-radius: 2px;
}

/* ── Narrow viewport: panel full-width ── */
@media (max-width: 400px) {
  #panel-wrap {
    width: 100%;
  }
}

/* ── Guest session prompt ── */
#collab-guest-prompt {
  position: fixed;
  inset: 0;
  z-index: 150;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
}

#collab-guest-box {
  background: #1e2124;
  border: 1px solid #333;
  border-radius: 8px;
  padding: 1.5rem 1.75rem;
  width: min(320px, 88vw);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
}

#collab-guest-box p {
  margin: 0;
  font-size: 0.9em;
  color: #c8cad4;
}

.im-collab-guest-hint {
  color: #7a8090 !important;
  font-size: 0.8em !important;
}

.im-collab-progress-wrap {
  width: 100%;
  height: 4px;
  background: #2a2d34;
  border-radius: 2px;
  overflow: hidden;
}

#collab-progress-bar {
  height: 100%;
  width: 0%;
  background: #4a9eed;
  border-radius: 2px;
  transition: width 0.1s linear;
}

/* ── Collaborate: cursor overlay ── */
#collab-cursor-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 10;
  overflow: visible;
}

.collab-cursor {
  position: fixed;
  top: 0;
  left: 0;
  pointer-events: none;
  will-change: transform;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.collab-cursor-label {
  font-size: 11px;
  font-family: inherit;
  padding: 1px 5px;
  border-radius: 3px;
  white-space: nowrap;
  margin-top: 1px;
  color: #fff;
  line-height: 1.5;
}

/* ── Collaborate: modal ── */
#collab-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
}

#collab-modal-box {
  background: #1e2124;
  border: 1px solid #333;
  border-radius: 8px;
  padding: 1.25rem;
  width: min(340px, 90vw);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.im-collab-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 0.95em;
}

.im-collab-header button {
  background: none;
  border: none;
  color: #888;
  cursor: pointer;
  font-size: 1rem;
  padding: 0 2px;
  line-height: 1;
}

.im-collab-header button:hover {
  color: #ccc;
}

.im-collab-role {
  margin-right: auto;
  margin-left: 0.6em;
  padding: 1px 8px;
  border-radius: 99px;
  font-size: 0.62em;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.im-collab-role-host {
  background: springgreen;
  color: #111;
}
.im-collab-role-guest {
  background: #2b6cff;
  color: #fff;
}
.im-collab-opt {
  color: #6a6f7a;
  font-weight: 400;
  font-size: 0.9em;
}

.im-collab-field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.im-collab-field label {
  font-size: 0.78em;
  color: #a0a4b0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.im-collab-field input {
  background: #13151a;
  border: 1px solid #333;
  border-radius: 5px;
  color: #e8eaf0;
  font-size: 0.88em;
  padding: 0.4em 0.6em;
  outline: none;
  width: 100%;
  box-sizing: border-box;
}

.im-collab-field input:focus {
  border-color: #555;
}

.im-collab-room-row {
  display: flex;
  gap: 0.4rem;
  align-items: center;
}

.im-collab-room-row input {
  flex: 1;
}

.im-collab-room-row button {
  background: #2a2d34;
  border: 1px solid #3a3d44;
  border-radius: 5px;
  color: #ccc;
  font-size: 0.8em;
  padding: 0.4em 0.7em;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
}

.im-collab-room-row button:hover {
  background: #32363f;
}

#collab-qr {
  display: flex;
  justify-content: center;
  padding: 0.4rem 0 0.2rem;
}
#collab-qr canvas,
#collab-qr img {
  border-radius: 6px;
  display: block;
  padding: 10px;
  background: #f0f0f0;
}

.im-collab-status {
  font-size: 0.8em;
  color: #7a8090;
  min-height: 1.2em;
}

.im-collab-status.im-collab-connected {
  color: #4caf80;
}

.im-btn-icon {
  padding: 0.38em 0.55em;
  line-height: 0;
}
.im-btn-icon svg {
  display: block;
}
.im-btn-icon.im-collab-live {
  border-color: springgreen;
  color: springgreen;
  animation: merge-glow 2.2s ease-in-out infinite;
}
.im-btn-icon.im-collab-live svg {
  stroke: springgreen;
}
.im-btn-icon.im-collab-live:hover {
  background: rgba(0, 255, 127, 0.1);
  animation: none;
  box-shadow: 0 0 18px rgba(0, 255, 127, 0.55);
}

#btn-collab {
  position: relative;
}
#btn-sim-undo,
#btn-sim-redo,
#btn-sim-select {
  position: relative;
}

/* Select-mask toggle: mobile-only (desktop uses marquee + shift/cmd-click). */
.im-sel-mobile {
  display: none;
}
@media (max-width: 500px) {
  .im-sel-mobile {
    display: inline-flex;
  }
}
#btn-sim-select.is-active {
  border-color: #38bdf8;
  color: #38bdf8;
}
#btn-sim-select.is-active svg {
  stroke: #38bdf8;
}
#sim-select-badge {
  background: #38bdf8;
}

/* Count badge on the undo/redo buttons (entries in each stack). */
.im-count-badge {
  position: absolute;
  bottom: 1px;
  right: 2px;
  font-size: 9px;
  font-weight: 700;
  line-height: 1;
  color: #111;
  background: springgreen;
  border-radius: 99px;
  padding: 1px 3px;
  pointer-events: none;
  white-space: nowrap;
}
.im-collab-badge {
  position: absolute;
  bottom: 1px;
  right: 2px;
  font-size: 9px;
  font-weight: 700;
  line-height: 1;
  color: #111;
  background: springgreen;
  border-radius: 99px;
  padding: 1px 3px;
  pointer-events: none;
}

#collab-send-progress,
#collab-recv-progress {
  margin: 0.35rem 0 0.1rem;
}

.im-collab-send-label {
  font-size: 0.8em;
  color: #7a8090;
  margin: 0 0 0.4rem;
}

#collab-send-bar,
#collab-recv-bar {
  height: 100%;
  width: 0%;
  background: springgreen;
  border-radius: 2px;
  transition: width 0.1s linear;
}

.im-collab-actions {
  display: flex;
  gap: 0.5rem;
}

/* ── Mobile ── */
@media (max-width: 500px) {
  .im-step-hd {
    min-height: 52px;
  }
  .im-snum {
    display: none;
  }
  .im-apptitle {
    font-size: 0.7em;
  }

  .im-rank-item,
  .im-rank-thumb {
    width: 72px;
    height: 72px;
    flex: 0 0 72px;
  }
  .im-rank-btn-group {
    bottom: 18px;
  }

  .im-paint-nav .im-btn {
    padding: 0.4em 0.7em;
  }
  .im-paint-hint {
    display: none;
  }

  .im-sim-btns {
    gap: 0.35em;
  }

  .im-upload-zone {
    padding: 1.8em 1em;
    margin: 0.75em;
  }
  .im-cfg-row {
    gap: 0.35em;
  }
}