/* ============ 基础 ============ */
/* 默认主题：紫 */
:root,
html[data-theme="purple"]{
  --bg:#12101a;
  --bg-2:#191527;
  --bg-3:#221c33;
  --line:#332a4a;
  --line-2:#463a63;
  --fg:#ece8f6;
  --fg-2:#a99dc4;
  --fg-3:#7d7397;
  --accent:#a97bff;
  --accent-2:#7c46e0;
  --board:#241f33;
  --ok:#3fb950;
  --warn:#e3b341;
  --danger:#f0616d;
  --radius:8px;
  --panel-w:308px;
  --panel-r:280px;
}
html[data-theme="blue"]{
  --bg:#0f1216; --bg-2:#161b22; --bg-3:#1c232c;
  --line:#2a323d; --line-2:#3a4553;
  --fg:#e6edf3; --fg-2:#9aa7b4; --fg-3:#6b7889;
  --accent:#4da3ff; --accent-2:#2b7fd4; --board:#20272f;
}
html[data-theme="teal"]{
  --bg:#0c1414; --bg-2:#111d1d; --bg-3:#16292a;
  --line:#22403f; --line-2:#2f5654;
  --fg:#e3f2f0; --fg-2:#94b8b5; --fg-3:#6b8b89;
  --accent:#3fd6c4; --accent-2:#1f9e91; --board:#1a2e2e;
}
html[data-theme="rose"]{
  --bg:#171014; --bg-2:#211620; --bg-3:#2c1d29;
  --line:#432a3d; --line-2:#5c3a53;
  --fg:#f6e8f0; --fg-2:#c39db4; --fg-3:#96738a;
  --accent:#ff79b0; --accent-2:#d94b88; --board:#31212d;
}
html[data-theme="amber"]{
  --bg:#15110b; --bg-2:#1f1911; --bg-3:#2a2217;
  --line:#443725; --line-2:#5d4b33;
  --fg:#f6efe2; --fg-2:#c0ac8c; --fg-3:#8f7f66;
  --accent:#f0a93b; --accent-2:#c47d16; --board:#2e2519;
}
html[data-theme="light"]{
  --bg:#f4f5f8; --bg-2:#ffffff; --bg-3:#f7f8fb;
  --line:#dfe3ea; --line-2:#c6ccd8;
  --fg:#1e2430; --fg-2:#5a6472; --fg-3:#8b94a3;
  --accent:#7c46e0; --accent-2:#6a35d0; --board:#e7e9ef;
}
html[data-theme="light"] .btn.primary{color:#fff}
html[data-theme="light"] .crow.on{background:#f0eaff}
html[data-theme="light"] .pchip.on{background:#f0eaff}
html[data-theme="light"] .menu{box-shadow:0 12px 32px rgba(0,0,0,.16)}
html[data-theme="light"] .panel::-webkit-scrollbar-thumb,
html[data-theme="light"] .pal-list::-webkit-scrollbar-thumb{background:#c6ccd8}
html[data-theme="light"] .empty-icon{color:#d3d8e2}
html[data-theme="light"] .scroller::-webkit-scrollbar-thumb{background:#c6ccd8}

/* 主题选择器 */
.theme-dots{display:flex;gap:7px;flex-wrap:wrap;align-items:center}
.theme-dots button{
  width:24px;height:24px;border-radius:50%;cursor:pointer;
  border:2px solid transparent;padding:0;position:relative;
}
.theme-dots button:hover{transform:scale(1.1)}
.theme-dots button.on{border-color:var(--fg)}
.theme-dots button.on::after{
  content:"✓";position:absolute;inset:0;display:flex;align-items:center;
  justify-content:center;color:#fff;font-size:12px;font-weight:700;
  text-shadow:0 1px 2px rgba(0,0,0,.6);
}

/* 专注模式：把左右面板收起来，图纸占满 */
body.focus-mode .panel{display:none}
body.focus-mode .layout{grid-template-columns:1fr}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--fg);
  font:13px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  display:flex; flex-direction:column;
  overflow:hidden;
}

/* ============ 顶栏 ============ */
.topbar{
  display:flex; align-items:center; justify-content:space-between;
  gap:16px; padding:10px 16px;
  background:var(--bg-2); border-bottom:1px solid var(--line);
  flex:0 0 auto;
}
.brand{display:flex;align-items:center;gap:10px}
.brand .logo{font-size:26px;color:var(--accent);line-height:1}
.brand h1{margin:0;font-size:15px;font-weight:650;letter-spacing:.02em}
.brand p{margin:1px 0 0;font-size:11.5px;color:var(--fg-3)}
.topbar-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}

/* ============ 按钮 ============ */
.btn{
  background:var(--bg-3); color:var(--fg); border:1px solid var(--line-2);
  padding:6px 11px; border-radius:6px; cursor:pointer; font-size:12.5px;
  font-family:inherit; white-space:nowrap; transition:.12s;
}
.btn:hover{background:#252e39;border-color:#4a5766}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--accent-2);border-color:var(--accent);color:#fff;font-weight:600}
.btn.primary:hover{background:var(--accent)}
.btn.ghost{background:transparent;border-color:var(--line)}
.btn.ghost:hover{background:var(--bg-3)}
.btn.wide{width:100%;margin:2px 0 6px}
.btn.tiny{padding:3px 8px;font-size:11.5px}
.btn:disabled{opacity:.4;cursor:not-allowed}

/* 下拉菜单 */
.menu-wrap{position:relative}
.menu{
  position:absolute; right:0; top:calc(100% + 6px); z-index:60;
  background:var(--bg-3); border:1px solid var(--line-2); border-radius:8px;
  padding:5px; min-width:230px; box-shadow:0 12px 32px rgba(0,0,0,.5);
}
.menu button{
  display:block; width:100%; text-align:left; background:none; border:0;
  color:var(--fg); padding:7px 10px; border-radius:5px; cursor:pointer;
  font:inherit; font-size:12.5px;
}
.menu button:hover{background:var(--accent-2);color:#fff}
.menu hr{border:0;border-top:1px solid var(--line);margin:5px 2px}
.hidden{display:none !important}

/* ============ 布局 ============ */
.layout{
  flex:1 1 auto; min-height:0;
  display:grid; grid-template-columns:var(--panel-w) minmax(0,1fr) var(--panel-r);
}
.panel{
  background:var(--bg-2); overflow-y:auto; overflow-x:hidden;
  padding:12px; min-height:0;
}
.panel.left{border-right:1px solid var(--line)}
.panel.right{border-left:1px solid var(--line)}
.panel::-webkit-scrollbar{width:9px}
.panel::-webkit-scrollbar-thumb{background:#333d49;border-radius:5px}
.panel::-webkit-scrollbar-track{background:transparent}

.group{
  background:var(--bg-3); border:1px solid var(--line);
  border-radius:var(--radius); padding:11px 11px 12px; margin-bottom:10px;
}
.group h2{
  margin:0 0 9px; font-size:12px; font-weight:650; color:var(--accent);
  letter-spacing:.06em; text-transform:uppercase;
}
.hint{margin:6px 0 0;font-size:11px;color:var(--fg-3);line-height:1.45}
.meta{margin:6px 0 0;font-size:11.5px;color:var(--fg-2)}

/* ============ 控件行 ============ */
.row{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.row.tight{margin-bottom:6px}
.row>label{flex:0 0 66px;font-size:12px;color:var(--fg-2)}
.row input[type=range]{flex:1 1 auto;min-width:0}
.row select,.row .search{
  flex:1 1 auto;min-width:0;background:var(--bg);color:var(--fg);
  border:1px solid var(--line-2);border-radius:5px;padding:5px 7px;
  font:inherit;font-size:12px;
}
.row input[type=color]{
  width:36px;height:26px;padding:1px;background:var(--bg);
  border:1px solid var(--line-2);border-radius:5px;cursor:pointer;
}
.num{
  flex:0 0 54px;width:54px;background:var(--bg);color:var(--fg);
  border:1px solid var(--line-2);border-radius:5px;padding:4px 5px;
  font:inherit;font-size:12px;text-align:center;
}
.val{flex:0 0 44px;text-align:right;font-size:11.5px;color:var(--fg-3);font-variant-numeric:tabular-nums}
.check{display:flex;align-items:center;gap:7px;margin:6px 0;font-size:12px;color:var(--fg-2);cursor:pointer}
.check input{accent-color:var(--accent);width:14px;height:14px}

input[type=range]{
  -webkit-appearance:none;appearance:none;height:4px;background:var(--line-2);
  border-radius:3px;outline:none;
}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:14px;height:14px;border-radius:50%;
  background:var(--accent);cursor:pointer;border:2px solid var(--bg-3);
}
input[type=range]::-moz-range-thumb{
  width:12px;height:12px;border-radius:50%;background:var(--accent);
  cursor:pointer;border:2px solid var(--bg-3);
}

details.sub{margin-top:8px;border-top:1px solid var(--line);padding-top:8px}
details.sub>summary{
  cursor:pointer;font-size:12px;color:var(--fg-2);list-style:none;
  padding:2px 0;user-select:none;
}
details.sub>summary::-webkit-details-marker{display:none}
details.sub>summary::before{content:"▸ ";color:var(--fg-3)}
details.sub[open]>summary::before{content:"▾ "}
details.sub>summary:hover{color:var(--fg)}
details.sub>*:not(summary){margin-top:8px}

/* 分段控件 */
.seg{display:flex;border:1px solid var(--line-2);border-radius:6px;overflow:hidden;margin-bottom:9px}
.seg button{
  flex:1;background:var(--bg);border:0;color:var(--fg-2);padding:6px 4px;
  cursor:pointer;font:inherit;font-size:12px;
}
.seg button+button{border-left:1px solid var(--line-2)}
.seg button.on{background:var(--accent-2);color:#fff;font-weight:600}

/* 预设 */
.presets{display:flex;flex-wrap:wrap;gap:5px;margin-top:2px}
.presets button{
  background:var(--bg);border:1px solid var(--line-2);color:var(--fg-2);
  padding:3px 8px;border-radius:20px;cursor:pointer;font:inherit;font-size:11.5px;
}
.presets button:hover{border-color:var(--accent);color:var(--accent)}

/* ============ 拖拽区 ============ */
.dropzone{
  border:1.5px dashed var(--line-2); border-radius:var(--radius);
  min-height:104px; display:flex; align-items:center; justify-content:center;
  cursor:pointer; text-align:center; padding:10px; transition:.15s;
  background:var(--bg); overflow:hidden; position:relative;
}
.dropzone:hover,.dropzone.over{border-color:var(--accent);background:#182130}
.dropzone #dropHint strong{display:block;font-size:12.5px;color:var(--fg-2);margin-bottom:3px}
.dropzone #dropHint span{font-size:11px;color:var(--fg-3)}
.dropzone img{max-width:100%;max-height:150px;display:block;border-radius:4px;
  image-rendering:auto;background:
    linear-gradient(45deg,#2a2a2a 25%,transparent 25%,transparent 75%,#2a2a2a 75%),
    linear-gradient(45deg,#2a2a2a 25%,transparent 25%,transparent 75%,#2a2a2a 75%);
  background-size:12px 12px;background-position:0 0,6px 6px;}
.dropzone.picking{cursor:crosshair;border-color:var(--warn)}

/* ---- 裁剪 ---- */
.crop-stage{position:relative;display:inline-block;line-height:0;max-width:100%}
.crop-stage.cropping{cursor:crosshair}
.crop-box{
  position:absolute;border:1px solid #fff;cursor:move;
  box-shadow:0 0 0 9999px rgba(0,0,0,.55);
  background:rgba(255,255,255,.04);
}
.crop-box::before,.crop-box::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(to right,rgba(255,255,255,.3) 1px,transparent 1px),
                   linear-gradient(to bottom,rgba(255,255,255,.3) 1px,transparent 1px);
  background-size:33.33% 33.33%;
}
.crop-box>i{
  position:absolute;width:11px;height:11px;background:#fff;border-radius:2px;
  box-shadow:0 0 0 1px rgba(0,0,0,.5);
}
.crop-box>i[data-h=nw]{left:-6px;top:-6px;cursor:nwse-resize}
.crop-box>i[data-h=n] {left:50%;margin-left:-5px;top:-6px;cursor:ns-resize}
.crop-box>i[data-h=ne]{right:-6px;top:-6px;cursor:nesw-resize}
.crop-box>i[data-h=w] {left:-6px;top:50%;margin-top:-5px;cursor:ew-resize}
.crop-box>i[data-h=e] {right:-6px;top:50%;margin-top:-5px;cursor:ew-resize}
.crop-box>i[data-h=sw]{left:-6px;bottom:-6px;cursor:nesw-resize}
.crop-box>i[data-h=s] {left:50%;margin-left:-5px;bottom:-6px;cursor:ns-resize}
.crop-box>i[data-h=se]{right:-6px;bottom:-6px;cursor:nwse-resize}

/* ---- 图片工具条 ---- */
.toolbar{display:flex;align-items:center;gap:5px;margin:8px 0 0;flex-wrap:wrap}
.toolbar .btn.tiny{min-width:30px;font-size:13px;line-height:1.2}
.toolbar .btn.on{background:var(--accent-2);border-color:var(--accent);color:#fff}
.tb-sep{width:1px;height:18px;background:var(--line-2);margin:0 3px}

/* ---- 场景预设 ---- */
.presets.scene button{padding:5px 10px;font-size:12px;border-radius:6px}
.presets.scene button.on{background:var(--accent-2);border-color:var(--accent);color:#fff;font-weight:600}

/* ============ 画布舞台 ============ */
.stage{display:flex;flex-direction:column;min-width:0;min-height:0;background:var(--bg)}
.viewport{position:relative;flex:1 1 auto;min-height:0;overflow:hidden;background:var(--board)}
#mainCanvas{position:absolute;left:0;top:0;display:block}
#rulerTop,#rulerLeft{position:absolute;left:0;top:0;display:block;z-index:3;pointer-events:none}
.corner{position:absolute;left:0;top:0;z-index:4;background:var(--bg-2);border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.scroller{position:absolute;inset:0;overflow:auto;z-index:5}
.scroller::-webkit-scrollbar{width:12px;height:12px}
.scroller::-webkit-scrollbar-thumb{background:#3a4553;border-radius:6px;border:3px solid var(--board)}
.scroller::-webkit-scrollbar-track{background:transparent}
#spacer{width:1px;height:1px}
.scroller.grabbing{cursor:grabbing}

.empty{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;z-index:6;pointer-events:none}
.empty-inner{text-align:center;color:var(--fg-3)}
.empty-icon{font-size:56px;color:#2f3946;line-height:1}
.empty-inner h3{margin:10px 0 4px;font-size:15px;color:var(--fg-2);font-weight:600}
.empty-inner p{margin:0;font-size:12px}

.busy{position:absolute;inset:0;z-index:9;display:flex;align-items:center;justify-content:center;
  gap:10px;background:rgba(15,18,22,.55);color:var(--fg-2);font-size:12.5px;backdrop-filter:blur(1px)}
.spinner{width:18px;height:18px;border:2px solid var(--line-2);border-top-color:var(--accent);
  border-radius:50%;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

.statusbar{
  flex:0 0 auto;display:flex;align-items:center;gap:12px;
  padding:5px 12px;background:var(--bg-2);border-top:1px solid var(--line);
  font-size:11.5px;color:var(--fg-3);font-variant-numeric:tabular-nums;
}
.spacer-x{flex:1}

/* ============ 统计 ============ */
.stats{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:10px}
.stats>div{background:var(--bg);border:1px solid var(--line);border-radius:6px;padding:7px 8px;min-width:0}
.stats b{
  display:block;font-size:15px;font-weight:650;color:var(--fg);
  font-variant-numeric:tabular-nums;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.stats b.sm{font-size:12.5px;line-height:1.62}
.stats span{font-size:10.5px;color:var(--fg-3)}

.color-list{margin-top:8px;display:flex;flex-direction:column;gap:3px}
.crow{
  display:flex;align-items:center;gap:8px;padding:5px 6px;border-radius:6px;
  cursor:pointer;border:1px solid transparent;background:var(--bg);
}
.crow:hover{border-color:var(--line-2)}
.crow.on{border-color:var(--accent);background:#17222f}
.crow.off{opacity:.4}
.crow .sw{
  flex:0 0 26px;height:26px;border-radius:5px;border:1px solid rgba(255,255,255,.16);
  display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;
}
.crow .info{flex:1 1 auto;min-width:0}
.crow .code{font-weight:700;font-size:12.5px;letter-spacing:.02em}
.crow .name{font-size:10.5px;color:var(--fg-3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.crow .cnt{flex:0 0 auto;text-align:right;font-variant-numeric:tabular-nums}
.crow .cnt b{display:block;font-size:12.5px;font-weight:600}
.crow .cnt span{font-size:10px;color:var(--fg-3)}
.crow .kill{
  flex:0 0 auto;background:none;border:0;color:var(--fg-3);cursor:pointer;
  font-size:12px;padding:2px 4px;border-radius:4px;
}
.crow .kill:hover{background:var(--danger);color:#fff}
.bar{height:3px;background:var(--line);border-radius:2px;margin-top:3px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--accent)}

/* ============ 弹窗 ============ */
.modal{position:fixed;inset:0;z-index:100;background:rgba(0,0,0,.6);display:flex;
  align-items:center;justify-content:center;padding:20px}
.modal-box{
  background:var(--bg-2);border:1px solid var(--line-2);border-radius:10px;
  width:min(860px,100%);max-height:88vh;display:flex;flex-direction:column;
  box-shadow:0 24px 64px rgba(0,0,0,.6);overflow:hidden;
}
.modal-head{display:flex;align-items:center;justify-content:space-between;
  padding:11px 14px;border-bottom:1px solid var(--line)}
.modal-head h3{margin:0;font-size:14px;font-weight:650}
.modal-toolbar{display:flex;gap:7px;align-items:center;padding:10px 14px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.modal-toolbar .search{flex:1 1 180px;min-width:140px;background:var(--bg);color:var(--fg);
  border:1px solid var(--line-2);border-radius:5px;padding:5px 8px;font:inherit;font-size:12px}
.series-bar{display:flex;gap:5px;flex-wrap:wrap;padding:9px 14px;border-bottom:1px solid var(--line)}
.series-bar button{background:var(--bg);border:1px solid var(--line-2);color:var(--fg-2);
  padding:3px 9px;border-radius:20px;cursor:pointer;font:inherit;font-size:11.5px}
.series-bar button:hover{border-color:var(--accent);color:var(--accent)}
.pal-list{
  flex:1 1 auto;overflow-y:auto;padding:12px 14px;
  display:grid;grid-template-columns:repeat(auto-fill,minmax(148px,1fr));gap:6px;
}
.pal-list::-webkit-scrollbar{width:9px}
.pal-list::-webkit-scrollbar-thumb{background:#333d49;border-radius:5px}
.pchip{display:flex;align-items:center;gap:7px;padding:5px 7px;background:var(--bg);
  border:1px solid var(--line);border-radius:6px;cursor:pointer;user-select:none}
.pchip:hover{border-color:var(--line-2)}
.pchip.on{border-color:var(--accent);background:#17222f}
.pchip input{accent-color:var(--accent);flex:0 0 auto}
.pchip .sw{flex:0 0 20px;height:20px;border-radius:4px;border:1px solid rgba(255,255,255,.18)}
.pchip .t{flex:1 1 auto;min-width:0;line-height:1.25}
.pchip .t b{display:block;font-size:11.5px}
.pchip .t span{display:block;font-size:10px;color:var(--fg-3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.custom-pal{padding:0 14px 12px;border-top:1px solid var(--line);margin-top:0}
.custom-pal textarea{
  width:100%;background:var(--bg);color:var(--fg);border:1px solid var(--line-2);
  border-radius:6px;padding:8px;font:12px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;resize:vertical;
}

/* ============ 页脚 ============ */
.site-foot{
  flex:0 0 auto;background:var(--bg-2);border-top:1px solid var(--line);
  padding:9px 16px;font-size:11.5px;color:var(--fg-3);
}
.foot-in{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:center}
.foot-sep{opacity:.4}
.site-foot a{color:var(--fg-2);text-decoration:none}
.site-foot a:hover{color:var(--accent)}
.linkbtn{
  background:none;border:0;color:var(--accent);cursor:pointer;font:inherit;
  padding:2px 4px;border-radius:4px;
}
.linkbtn:hover{background:var(--bg-3);text-decoration:underline}
.dim{opacity:.55}

/* ============ 反馈弹窗 ============ */
.modal-box.narrow{width:min(520px,100%)}
.modal-body{padding:14px;overflow-y:auto}
.modal-foot{
  display:flex;gap:8px;justify-content:flex-end;
  padding:11px 14px;border-top:1px solid var(--line);
}
.fb-label{display:block;font-size:12px;color:var(--fg-2);margin:8px 0 5px}
.fb-label .req{color:var(--danger)}
#fbText,.txt{
  width:100%;background:var(--bg);color:var(--fg);border:1px solid var(--line-2);
  border-radius:6px;padding:8px;font:inherit;font-size:12.5px;resize:vertical;
}
.row .txt{flex:1 1 auto;min-width:0;width:auto}
.diag{
  background:var(--bg);border:1px solid var(--line);border-radius:6px;
  padding:8px 10px;margin:0;max-height:180px;overflow:auto;
  font:11px/1.55 ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--fg-2);
  white-space:pre-wrap;word-break:break-all;
}
.seg.small button{font-size:11.5px;padding:5px 6px}

/* ============ 窄屏 ============ */
@media (max-width:1180px){
  :root{--panel-w:270px;--panel-r:240px}
}
@media (max-width:900px){
  /* 竖排：整页滚动，各面板完整展开（不要再各自内部滚动，否则控件被藏起来） */
  html,body{height:auto}
  body{overflow:auto;display:block}
  .topbar{position:sticky;top:0;z-index:50}
  .layout{display:block}
  .panel{overflow:visible;max-height:none;border:0;border-bottom:1px solid var(--line)}
  .panel.left,.panel.right{border-left:0;border-right:0}
  .stage{height:70vh;min-height:400px}
  .statusbar{flex-wrap:wrap}
  .pal-list{grid-template-columns:repeat(auto-fill,minmax(130px,1fr))}
}
@media (max-width:520px){
  .topbar{flex-wrap:wrap;gap:8px}
  .stats{grid-template-columns:1fr}
}

/* 关掉网格线后，加粗间隔就没意义了，置灰 */
.seg.disabled{opacity:.4}
.seg button:disabled{cursor:not-allowed}

/* ============ 触屏手势 ============ */
/* 必须关掉浏览器的默认手势，否则双指会被拿去缩放整个页面，
   我们的 pointermove 收不到第二根手指 —— 手机上捏合失效就是这个原因。
   代价是单指平移要自己实现（见 app.js 的 Pointer Events 部分）。 */
.scroller{touch-action:none}
.crop-stage{touch-action:none}

/* ============ 沉浸模式（全屏兜底） ============ */
/* iOS Safari 不支持非 video 元素的 Fullscreen API，
   所以真全屏之外还得有一套纯 CSS 的沉浸模式，手机上才有全屏可用。 */
body.immersive .topbar,
body.immersive .panel,
body.immersive .site-foot{display:none}
body.immersive .layout{display:block;grid-template-columns:1fr}
body.immersive .stage{height:100vh;height:100dvh}
body.immersive{overflow:hidden}

#immersiveExit{
  display:none;position:fixed;z-index:200;
  top:calc(env(safe-area-inset-top, 0px) + 10px);
  right:calc(env(safe-area-inset-right, 0px) + 10px);
  background:rgba(0,0,0,.62);color:#fff;border:1px solid rgba(255,255,255,.28);
  padding:8px 13px;border-radius:20px;cursor:pointer;
  font:inherit;font-size:12.5px;backdrop-filter:blur(6px);
}
#immersiveExit:hover{background:rgba(0,0,0,.8)}
body.immersive #immersiveExit{display:block}

@media (max-width:900px){
  body.immersive .stage{height:100vh;height:100dvh;min-height:0}
}