:root{
  --bg:#f2f4f8; --panel:#ffffff; --line:#e3e7ee; --line2:#eef1f6;
  --text:#1a2230; --muted:#6b7688; --accent:#2f6df6; --accent-d:#1f57d6;
  --ok:#1f9d6b; --danger:#e2564f; --radius:14px; --radius-s:10px;
  --shadow:0 6px 24px rgba(20,35,70,.10); --shadow-s:0 2px 8px rgba(20,35,70,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--text); overflow:hidden;
  display:flex; flex-direction:column; -webkit-tap-highlight-color:transparent;
}
.hint{color:var(--muted);font-size:12px}
.spacer{flex:1}

/* topbar */
.topbar{
  display:flex;align-items:center;gap:10px;padding:10px 16px;background:var(--panel);
  border-bottom:1px solid var(--line); box-shadow:var(--shadow-s); z-index:20; flex-shrink:0;
}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:16px;color:var(--accent);white-space:nowrap}
.top-actions{display:flex;gap:8px;margin-left:auto;flex-wrap:wrap;justify-content:flex-end}

/* buttons */
.btn{
  display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border:1px solid var(--line);
  border-radius:var(--radius-s);background:#fff;color:var(--text);font-size:13px;font-weight:600;
  cursor:pointer;transition:.15s;white-space:nowrap;font-family:inherit;line-height:1;
}
.btn:hover{background:#f7f9fc;border-color:#cfd7e3}
.btn:active{transform:scale(.97)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{background:var(--accent-d)}
.btn.lg{padding:12px 22px;font-size:15px;border-radius:12px}
.btn.ico{padding:8px 11px}
.btn.danger{color:var(--danger);border-color:#f2d3d0}
.btn.danger:hover{background:#fdf3f2}
.btn:disabled{opacity:.45;cursor:not-allowed}

/* layout */
.layout{flex:1;display:flex;min-height:0}
.pages{
  width:132px;flex-shrink:0;background:var(--panel);border-right:1px solid var(--line);
  overflow-y:auto;padding:12px 10px;display:flex;flex-direction:column;gap:10px;
}
.pages:empty{display:none}
.thumb{position:relative;border-radius:10px;overflow:hidden;border:2px solid transparent;background:#eef1f6;cursor:pointer;aspect-ratio:3/4;box-shadow:var(--shadow-s)}
.thumb.active{border-color:var(--accent)}
.thumb img{width:100%;height:100%;object-fit:cover;display:block}
.thumb .no{position:absolute;left:5px;top:5px;background:rgba(0,0,0,.55);color:#fff;font-size:11px;padding:1px 6px;border-radius:6px}
.thumb .mini{position:absolute;right:4px;bottom:4px;display:flex;gap:3px}
.thumb .mini button{border:0;background:rgba(0,0,0,.55);color:#fff;border-radius:6px;font-size:11px;padding:2px 5px;cursor:pointer;line-height:1}

/* stage */
.stage-wrap{flex:1;display:flex;flex-direction:column;min-width:0;min-height:0}
.stage{flex:1;position:relative;display:flex;align-items:center;justify-content:center;overflow:hidden;padding:16px;min-height:0}
#view{max-width:100%;max-height:100%;box-shadow:var(--shadow);border-radius:6px;background:#fff}
#view[hidden]{display:none}
.handles{position:absolute;pointer-events:none}
.handles[hidden]{display:none}
.hnd{position:absolute;width:26px;height:26px;margin:-13px 0 0 -13px;border-radius:50%;background:rgba(47,109,246,.9);
  border:3px solid #fff;box-shadow:0 2px 8px rgba(0,0,0,.35);pointer-events:auto;cursor:grab;touch-action:none}
.hnd:active{cursor:grabbing;background:var(--accent-d)}
.quad{position:absolute;inset:0;pointer-events:none;overflow:visible}
.quad polygon{fill:rgba(47,109,246,.12);stroke:rgba(47,109,246,.9);stroke-width:2;vector-effect:non-scaling-stroke}

/* empty */
.empty{text-align:center;max-width:420px;color:var(--muted);user-select:none}
.empty-ico{font-size:56px;line-height:1;margin-bottom:12px;filter:grayscale(.2)}
.empty h2{color:var(--text);font-size:20px;margin-bottom:6px}
.empty p{margin-bottom:16px}
.empty-btns{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:14px}

/* controls */
.controls{flex-shrink:0;background:var(--panel);border-top:1px solid var(--line);padding:10px 16px;display:flex;flex-direction:column;gap:9px}
.controls[hidden]{display:none}
.ctl-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.lbl{font-size:13px;font-weight:700;color:var(--muted)}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:var(--radius-s);overflow:hidden;background:#fff}
.seg-btn{border:0;background:#fff;padding:8px 13px;font-size:13px;font-weight:600;color:var(--muted);cursor:pointer;font-family:inherit;border-right:1px solid var(--line2)}
.seg-btn:last-child{border-right:0}
.seg-btn.active{background:var(--accent);color:#fff}

/* modals */
.modal{position:fixed;inset:0;background:rgba(12,18,30,.62);display:flex;align-items:center;justify-content:center;z-index:60;padding:16px}
.modal[hidden]{display:none}
.modal-box{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);max-width:100%;max-height:100%;overflow:auto}
.modal-box.cam{background:#000;padding:0;display:flex;flex-direction:column;width:min(680px,100%);}
#camVideo{width:100%;max-height:72vh;background:#000;object-fit:contain;display:block}
.cam-bar{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;background:#111}
.cam-bar .btn{background:#2a2f3a;color:#fff;border-color:#3a4150}
.shutter{width:64px;height:64px;border-radius:50%;background:#fff;border:4px solid #999;cursor:pointer;transition:.12s}
.shutter:active{transform:scale(.92)}
.modal-box.ocr{width:min(680px,100%);display:flex;flex-direction:column;padding:16px}
.ocr-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
#ocrText{width:100%;height:46vh;resize:vertical;border:1px solid var(--line);border-radius:10px;padding:12px;font-size:14px;line-height:1.7;font-family:inherit;color:var(--text)}
.ocr-foot{display:flex;align-items:center;gap:12px;margin-top:10px}
.modal-box.exp{width:min(420px,100%);padding:20px}
.modal-box.exp h3{margin-bottom:14px}
.rad{display:flex;align-items:center;gap:10px;padding:11px 4px;font-size:14px;cursor:pointer;border-bottom:1px solid var(--line2)}
.exp-foot{display:flex;justify-content:flex-end;gap:10px;margin-top:16px}

/* toast + loading */
.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%);background:#1a2230;color:#fff;padding:11px 20px;border-radius:22px;font-size:14px;z-index:90;box-shadow:var(--shadow);max-width:88vw;text-align:center}
.toast[hidden]{display:none}
.toast.err{background:var(--danger)}
.toast.ok{background:var(--ok)}
.loading{position:fixed;inset:0;background:rgba(255,255,255,.78);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;z-index:80;color:var(--muted);font-weight:600}
.loading[hidden]{display:none}
.ring{width:44px;height:44px;border:4px solid #dfe5ee;border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

@media (max-width:680px){
  .topbar{padding:8px 12px}
  .brand span{display:none}
  .btn{padding:8px 11px}
  .layout{flex-direction:column}
  .pages{width:auto;flex-direction:row;border-right:0;border-bottom:1px solid var(--line);padding:8px;gap:8px;overflow-x:auto;overflow-y:hidden}
  .thumb{width:64px;flex-shrink:0;aspect-ratio:3/4}
  .stage{padding:8px}
  .controls{padding:8px 10px}
  .hnd{width:30px;height:30px;margin:-15px 0 0 -15px}
}