:root{
  --bg:#1b1b1f; --bg2:#232329; --bg3:#2c2c34; --line:#3a3a44;
  --fg:#e7e7ee; --muted:#9a9aa8; --accent:#4c8dff; --accent2:#ffcc4d;
  --tabh:38px; --railw:52px; --topb:44px;
  --paper:#ffffff;
}
html[data-theme="light"]{
  --bg:#eceef2; --bg2:#f7f8fa; --bg3:#ffffff; --line:#d3d6de;
  --fg:#1d1f24; --muted:#6a6e7a; --accent:#2f6fe4;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;overflow:hidden;overscroll-behavior:none}
body{
  background:var(--bg);color:var(--fg);
  font:14px/1.35 "Segoe UI",system-ui,-apple-system,"Noto Sans Arabic",sans-serif;
  -webkit-tap-highlight-color:transparent;user-select:none;
}
.hidden{display:none !important}
.spacer{flex:1}
.muted{color:var(--muted)}
#app{display:flex;flex-direction:column;height:100%;padding-top:env(safe-area-inset-top)}

/* ---------- tab bar ---------- */
#tabbar{display:flex;align-items:flex-end;gap:2px;height:var(--tabh);min-height:var(--tabh);
  background:var(--bg);padding:0 4px;border-bottom:1px solid var(--line);overflow:hidden}
#tabs{display:flex;gap:2px;overflow-x:auto;scrollbar-width:none;flex:0 1 auto}
#tabs::-webkit-scrollbar{display:none}
.tab{display:flex;align-items:center;gap:8px;height:calc(var(--tabh) - 4px);max-width:230px;min-width:120px;
  padding:0 6px 0 10px;border-radius:8px 8px 0 0;background:transparent;color:var(--muted);
  border:1px solid transparent;border-bottom:none;cursor:pointer;white-space:nowrap;flex:0 0 auto}
.tab:hover{background:var(--bg2)}
.tab.active{background:var(--bg3);color:var(--fg);border-color:var(--line)}
.tab .ttl{overflow:hidden;text-overflow:ellipsis;font-size:13px}
.tab .ico{width:14px;height:14px;flex:0 0 14px;color:#e0574d}
.tab .x{width:20px;height:20px;border-radius:5px;display:grid;place-items:center;font-size:14px;color:var(--muted);flex:0 0 20px}
.tab .x:hover{background:#0004;color:var(--fg)}
.tab.drag{opacity:.45}
.tabbtn{height:26px;min-width:28px;margin-bottom:5px;border:none;border-radius:6px;background:transparent;
  color:var(--muted);font-size:16px;cursor:pointer;padding:0 8px}
.tabbtn:hover{background:var(--bg2);color:var(--fg)}
#installBtn{font-size:12px;color:var(--accent)}

#main{flex:1;display:flex;min-height:0}

/* ---------- tool rail ---------- */
#tools{width:var(--railw);background:var(--bg2);border-right:1px solid var(--line);
  display:flex;flex-direction:column;align-items:center;gap:4px;padding:6px 0;overflow-y:auto;scrollbar-width:none}
#tools::-webkit-scrollbar{display:none}
.tool{width:38px;height:38px;border:none;border-radius:9px;background:transparent;color:var(--muted);
  display:grid;place-items:center;cursor:pointer;flex:0 0 auto}
.tool:hover{background:var(--bg3);color:var(--fg)}
.tool.active{background:var(--accent);color:#fff}
.tool svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.railsep{width:26px;height:1px;background:var(--line);margin:4px 0}
.swatchbtn #colorDot{width:20px;height:20px;border-radius:50%;background:#ffcc4d;box-shadow:0 0 0 2px #0006 inset}

/* ---------- topbar ---------- */
#stage{flex:1;display:flex;flex-direction:column;min-width:0}
#topbar{height:var(--topb);min-height:var(--topb);display:flex;align-items:center;gap:10px;
  padding:0 8px;background:var(--bg2);border-bottom:1px solid var(--line);overflow-x:auto;scrollbar-width:none}
#topbar::-webkit-scrollbar{display:none}
.grp{display:flex;align-items:center;gap:3px;flex:0 0 auto}
.tb{height:30px;min-width:30px;padding:0 8px;border:1px solid transparent;border-radius:7px;background:transparent;
  color:var(--fg);cursor:pointer;font-size:14px}
.tb:hover{background:var(--bg3)}
.tb.active{background:var(--accent);color:#fff}
.tb.wide{min-width:62px;font-size:12px}
#pageInput{width:46px;height:28px;text-align:center;border-radius:6px;border:1px solid var(--line);
  background:var(--bg3);color:var(--fg);font-size:13px}
.chk{display:flex;align-items:center;gap:4px;font-size:12px;color:var(--muted);padding:0 4px}
#saveBtn{background:var(--accent);color:#fff;font-size:13px}

/* ---------- viewport ---------- */
#viewport{flex:1;overflow:auto;position:relative;background:var(--bg);
  -webkit-overflow-scrolling:touch;overscroll-behavior:contain}
#viewport.grab{cursor:grab}
#viewport.grabbing{cursor:grabbing}
#viewport.draw{cursor:crosshair}
#pages{display:flex;flex-direction:column;align-items:center;gap:14px;padding:16px;min-width:min-content;min-height:min-content}
#pages.double{flex-direction:row;justify-content:center;align-items:flex-start;flex-wrap:nowrap;gap:10px}
#pages.single{justify-content:flex-start}
.page{position:relative;background:var(--paper);box-shadow:0 3px 14px #0007;flex:0 0 auto}
.page canvas{display:block;width:100%;height:100%;image-rendering:auto}
.page .ovl{position:absolute;inset:0}
.page .num{position:absolute;bottom:-14px;right:2px;font-size:10px;color:var(--muted)}
.page.anim-next{animation:slideNext .28s ease}
.page.anim-prev{animation:slidePrev .28s ease}
.page.flip-next{animation:flipNext .4s ease;transform-origin:left center}
.page.flip-prev{animation:flipPrev .4s ease;transform-origin:right center}
@keyframes slideNext{from{transform:translateX(42px)}to{transform:none}}
@keyframes slidePrev{from{transform:translateX(-42px)}to{transform:none}}
@keyframes flipNext{from{transform:perspective(1600px) rotateY(-72deg)}to{transform:none}}
@keyframes flipPrev{from{transform:perspective(1600px) rotateY(72deg)}to{transform:none}}

#empty{position:absolute;inset:0;display:grid;place-items:center;text-align:center;padding:20px}
.emptyinner h1{margin:0 0 6px;font-size:26px;letter-spacing:.5px}
.emptyinner p{color:var(--muted);margin:4px 0 16px}
.hint{font-size:12px}
.bigbtn{padding:12px 26px;border:none;border-radius:10px;background:var(--accent);color:#fff;font-size:15px;cursor:pointer}

/* ---------- text annotation editor ---------- */
.textedit{position:absolute;z-index:40;min-width:80px;background:#ffffffcc;border:1px dashed var(--accent);
  color:#000;padding:2px 4px;outline:none;font-family:Helvetica,Arial,sans-serif;white-space:pre-wrap}

/* ---------- popovers ---------- */
.pop{position:fixed;z-index:60;background:var(--bg3);border:1px solid var(--line);border-radius:12px;
  padding:12px;box-shadow:0 14px 36px #0009;min-width:190px}
.pop.pick{width:246px}
.svwrap{position:relative;line-height:0}
#svBox{border-radius:8px;width:220px;height:150px;cursor:crosshair;touch-action:none}
#hueBar{margin-top:10px;border-radius:8px;width:220px;height:16px;cursor:pointer;touch-action:none}
.marker{position:absolute;width:14px;height:14px;border-radius:50%;border:2px solid #fff;
  box-shadow:0 0 0 1px #0008,0 1px 4px #0007;transform:translate(-50%,-50%);pointer-events:none}
.pickrow{display:flex;align-items:center;gap:8px;margin-top:10px;font-size:12px;color:var(--muted)}
.plab{width:52px;flex:0 0 52px}
.pval{width:40px;text-align:right}
.pickrow input[type=range]{flex:1;min-width:0}
#hexInput{flex:1;min-width:0;height:26px;border-radius:6px;border:1px solid var(--line);
  background:var(--bg2);color:var(--fg);font-size:12px;padding:0 6px;font-family:ui-monospace,monospace}
.preview{width:26px;height:26px;border-radius:6px;border:1px solid var(--line);flex:0 0 26px}
.recents{display:grid;grid-template-columns:repeat(8,1fr);gap:6px;margin-top:12px}
.sw{width:100%;aspect-ratio:1;border-radius:50%;cursor:pointer;border:2px solid transparent;
  box-shadow:0 0 0 1px #0004 inset}
.sw.active{border-color:var(--fg)}

.sizehead{display:flex;justify-content:space-between;align-items:baseline;font-size:12px;
  color:var(--muted);margin-bottom:8px}
#sizeVal{color:var(--fg);font-size:13px}
#sizeRange{width:100%}
.sizeprev{height:66px;display:grid;place-items:center;margin-top:6px;
  background:var(--bg2);border-radius:8px;overflow:hidden}
#sizeDot{display:block;border-radius:50%}
.poprow{display:flex;align-items:center;gap:8px;margin-top:10px;font-size:12px;color:var(--muted)}
.sizebtn{position:relative}
#sizeNum{position:absolute;bottom:1px;right:2px;font-size:9px;line-height:1;color:var(--muted)}
.tool.dim{opacity:.35}

.menuitem{display:block;width:100%;text-align:left;background:transparent;border:none;color:var(--fg);
  padding:9px 10px;border-radius:7px;cursor:pointer;font-size:13px}
.menuitem:hover{background:var(--bg2)}

#toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);z-index:80;
  background:#000000dd;color:#fff;padding:10px 16px;border-radius:9px;font-size:13px;pointer-events:none}
#busy{position:fixed;inset:0;z-index:90;background:#00000099;display:grid;place-items:center}
.spin{width:38px;height:38px;border:3px solid #ffffff44;border-top-color:#fff;border-radius:50%;animation:sp .8s linear infinite}
@keyframes sp{to{transform:rotate(1turn)}}

@media (max-width:760px){
  :root{--railw:46px}
  .tab{min-width:96px;max-width:150px}
}