:root{
  --bg:#e9ecf1; --panel:#fff; --ink:#1c2330; --muted:#667085; --line:#dfe3ea;
  --accent:#2f5bea; --accent-ink:#fff; --hover:#f0f3f8; --danger:#d92d20;
  --shadow:0 1px 3px rgba(16,24,40,.12),0 4px 14px rgba(16,24,40,.08);
  color-scheme:light dark;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#111318; --panel:#1b1e25; --ink:#e7e9ee; --muted:#9aa3b2; --line:#2c313a; --hover:#272b34; --accent:#5b82ff}
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
html{overflow:hidden}
body{
  display:flex;flex-direction:column;height:100dvh;overflow:hidden;
  background:var(--bg);color:var(--ink);
  font:15px/1.4 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  -webkit-tap-highlight-color:transparent;
}
[hidden]{display:none!important}
body.no-doc .doc-only{display:none!important}
body:not(.no-doc) #welcome{display:none}
button{font:inherit;color:inherit}
.ic{width:22px;height:22px;flex:none;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.grow{flex:1}

/* ---------- top bar ---------- */
#bar{
  display:flex;align-items:center;gap:6px;flex:none;
  padding:6px max(8px,env(safe-area-inset-right)) 6px max(8px,env(safe-area-inset-left));
  padding-top:max(6px,env(safe-area-inset-top));
  background:var(--panel);border-bottom:1px solid var(--line);z-index:5;
}
.brand{display:flex;align-items:center;gap:8px;font-weight:650;color:var(--ink);text-decoration:none;padding:0 4px}
.brand .ic{color:var(--accent)}
#fname{color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0;padding-left:8px;border-left:1px solid var(--line)}
.grp{display:flex;align-items:center;gap:2px}
.grp+.grp{margin-left:4px;padding-left:6px;border-left:1px solid var(--line)}
.ib{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  min-width:40px;height:40px;padding:0 9px;border:0;border-radius:9px;background:none;cursor:pointer;
}
.ib:hover{background:var(--hover)}
.ib:disabled{opacity:.35;cursor:default;background:none}
.ib.primary{background:var(--accent);color:var(--accent-ink);padding:0 14px;font-weight:600}
.ib.primary:hover{filter:brightness(1.08)}
.ib.danger{color:var(--danger)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ---------- tools + properties ---------- */
#toolbar{display:flex;flex:none;flex-wrap:wrap;align-items:center;gap:4px 14px;background:var(--panel);border-bottom:1px solid var(--line);padding:4px 8px;z-index:4}
#tools,#props{display:flex;align-items:center;gap:2px;overflow-x:auto;scrollbar-width:none;min-width:0}
#tools::-webkit-scrollbar,#props::-webkit-scrollbar{display:none}
.tool{flex-direction:column;gap:1px;height:48px;min-width:52px;padding:0 6px;font-size:10.5px;color:var(--muted);flex:none}
.tool .ic{color:var(--ink)}
.tool.on{background:color-mix(in srgb,var(--accent) 14%,transparent);color:var(--accent)}
.tool.on .ic{color:var(--accent)}
#props{gap:12px;min-height:44px;flex:1}
.prop{display:flex;align-items:center;gap:6px;flex:none;font-size:13px;color:var(--muted);white-space:nowrap}
.prop output{min-width:2ch;color:var(--ink);font-variant-numeric:tabular-nums}
.prop input[type=range]{width:110px;accent-color:var(--accent)}
.prop.chk input{width:18px;height:18px;accent-color:var(--accent)}
.prop.hint{white-space:normal;line-height:1.25;flex:1 1 auto;min-width:180px}
.sw{
  width:28px;height:28px;border-radius:50%;padding:0;flex:none;cursor:pointer;
  border:2px solid var(--panel);box-shadow:0 0 0 1px var(--line);background:var(--c);
}
.sw.on{box-shadow:0 0 0 2px var(--accent)}
.sw.custom{background:conic-gradient(#f43f5e,#f59e0b,#84cc16,#06b6d4,#6366f1,#d946ef,#f43f5e);position:relative;overflow:hidden}
.sw.custom input{position:absolute;inset:-8px;width:200%;height:200%;opacity:0;cursor:pointer}
#p-del{height:36px}

/* ---------- viewer ---------- */
#viewer{flex:1;min-height:0;overflow:auto;position:relative;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}
#pages{display:flex;flex-direction:column;align-items:center;gap:14px;padding:14px 12px 90px;width:max-content;min-width:100%}
#pages[data-wide="true"]{align-items:flex-start}
.pg{position:relative;flex:none;background:#fff;box-shadow:var(--shadow);color-scheme:light;isolation:isolate}
.pg svg.ov.hl{mix-blend-mode:multiply}
.pg canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.pg .annotationLayer{position:absolute;inset:0;z-index:1}
.pg svg.ov{position:absolute;inset:0;width:100%;height:100%;z-index:2;overflow:visible;pointer-events:none;-webkit-user-select:none;user-select:none}
.pg svg.ov text{white-space:pre;pointer-events:none}
.ov .hit{stroke:transparent;fill:none;pointer-events:stroke}
.ov .hit.f{fill:transparent;pointer-events:all}
.ov [data-id]{touch-action:none;cursor:move}
.ov .selbox{fill:none;stroke:var(--accent);stroke-width:1.2;stroke-dasharray:4 3;vector-effect:non-scaling-stroke;pointer-events:none}
.ov .hd{touch-action:none;cursor:nwse-resize}
.ov .hd .dot{fill:#fff;stroke:var(--accent);stroke-width:2;vector-effect:non-scaling-stroke}
.ov .hd .pad{fill:transparent;pointer-events:all}
#pages.t-draw .ov{pointer-events:auto;touch-action:pinch-zoom;cursor:crosshair}
#pages.t-draw .ov [data-id]{cursor:crosshair}
#pages.t-text .ov{pointer-events:auto;cursor:text}
#pages.t-text .ov [data-id]{cursor:text;touch-action:auto}
#pages.t-eraser .ov,#pages.t-eraser .ov [data-id]{cursor:cell}
.txt-edit{
  position:absolute;z-index:3;margin:0;padding:0;border:0;border-radius:0;resize:none;overflow:hidden;
  background:rgba(47,91,234,.07);outline:1.5px dashed var(--accent);outline-offset:2px;
  font-family:Helvetica,Arial,"Liberation Sans",sans-serif;line-height:1.2;white-space:pre;
  -webkit-appearance:none;appearance:none;
}

#zoom{
  position:fixed;right:max(12px,env(safe-area-inset-right));bottom:calc(14px + var(--bottom-ui,0px));z-index:6;
  display:flex;align-items:center;background:var(--panel);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);
}
#zoom .ib{height:38px;min-width:38px}
#b-zfit{border:0;background:none;min-width:52px;height:38px;cursor:pointer;font-size:13px;font-variant-numeric:tabular-nums}

/* ---------- welcome ---------- */
#welcome{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:18px;padding:20px;overflow:auto}
#drop{
  width:min(560px,100%);text-align:center;padding:36px 24px;border-radius:18px;
  background:var(--panel);border:2px dashed var(--line);box-shadow:var(--shadow);
}
body.dragging #drop{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 8%,var(--panel))}
#drop h1{font-size:22px;line-height:1.2;margin:10px 0 6px}
#drop p{margin:0;color:var(--muted)}
#drop .sub{font-size:13px;margin-top:14px}
.ic.big{width:46px;height:46px;color:var(--accent);stroke-width:1.5}
.cta{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:20px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 20px;border-radius:11px;cursor:pointer;
  border:1px solid var(--line);background:var(--panel);font-weight:600;
}
.btn:hover{background:var(--hover)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn.primary:hover{filter:brightness(1.08);background:var(--accent)}
.btn.ghost{border-color:transparent;color:var(--muted);font-weight:500}
.privacy{display:flex;gap:10px;align-items:flex-start;max-width:520px;margin:0;color:var(--muted);font-size:13.5px}
.privacy .ic{width:18px;height:18px;margin-top:1px}

/* ---------- overlays ---------- */
dialog{border:0;border-radius:16px;padding:22px;width:min(380px,calc(100vw - 32px));background:var(--panel);color:var(--ink);box-shadow:var(--shadow)}
dialog::backdrop{background:rgba(10,14,22,.5)}
dialog h2{margin:0 0 6px;font-size:19px}
dialog p{margin:0 0 16px;color:var(--muted)}
dialog p:empty{display:none}
.col{display:flex;flex-direction:column;gap:8px}
#busy{position:fixed;inset:0;z-index:50;display:flex;flex-direction:column;gap:14px;align-items:center;justify-content:center;background:rgba(10,14,22,.45);color:#fff;font-weight:600}
.spin{width:38px;height:38px;border-radius:50%;border:4px solid rgba(255,255,255,.3);border-top-color:#fff;animation:sp .8s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
#toast{
  position:fixed;left:50%;bottom:calc(70px + var(--bottom-ui,0px));transform:translateX(-50%);z-index:60;max-width:min(92vw,520px);
  background:#1c2330;color:#fff;padding:11px 16px;border-radius:11px;box-shadow:var(--shadow);font-size:14px;text-align:center;
}

/* ---------- phones: tools move to the bottom, within thumb reach ---------- */
@media (max-width:760px){
  .brand span,#fname{display:none}
  #b-save span{display:none}
  .ib.primary{padding:0 11px}
  #toolbar{order:3;flex-flow:column-reverse nowrap;align-items:stretch;gap:0;min-width:0;padding:0;border-bottom:0;border-top:1px solid var(--line);
    padding-bottom:env(safe-area-inset-bottom)}
  #tools{padding:4px max(6px,env(safe-area-inset-right)) 4px max(6px,env(safe-area-inset-left))}
  #props{padding:2px 12px;border-bottom:1px solid var(--line);flex:none}
  .tool{min-width:56px;height:52px}
  .prop.hint{min-width:0;font-size:12.5px}
  #pages{padding:10px 8px 80px;gap:10px}
  :root{--bottom-ui:112px}
}

/* ---------- printing: only the prepared page images ---------- */
#print-root{display:none}
@media print{
  html,body{height:auto!important;overflow:visible!important;display:block!important;background:#fff!important}
  body>*:not(#print-root){display:none!important}
  #print-root{display:block}
  .pp{break-after:page;page-break-after:always;break-inside:avoid;page-break-inside:avoid}
  .pp:last-child{break-after:auto;page-break-after:auto}
  .pp img{display:block;width:100%;height:auto;max-height:100vh;object-fit:contain;margin:0 auto}
}