*{box-sizing:border-box}
.np-viewer{
  --np-bg:#e9edf2;--np-panel:#fff;--np-line:#d7dde5;--np-text:#17212b;
  --np-accent:#243b53;
  width:100%;max-width:1200px;margin:0 auto;background:var(--np-panel);
  border:1px solid var(--np-line);border-radius:14px;overflow:hidden;
  box-shadow:0 12px 35px rgba(23,33,43,.12);
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--np-text);
}
.np-topbar{height:58px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 12px;border-bottom:1px solid var(--np-line);background:#fff;position:relative;z-index:20}
.np-pageinfo{display:flex;align-items:center;gap:12px;white-space:nowrap}
.np-pageinfo>span{font-variant-numeric:tabular-nums;color:#596575}
.np-controls{display:flex;align-items:center;gap:6px}
.np-controls button{height:38px;min-width:38px;padding:0 10px;border:1px solid var(--np-line);background:#fff;border-radius:8px;color:var(--np-text);font:inherit;font-weight:650;cursor:pointer}
.np-controls button:hover{background:#eef2f6}
.np-controls button:disabled{opacity:.35;cursor:default}
.np-controls button[aria-pressed="true"]{background:#e4eaf0;border-color:#aeb9c6}
.np-zoom-value{min-width:62px!important;font-size:.82rem}
.np-divider{width:1px;height:24px;background:var(--np-line);margin:0 3px}

.np-stage{height:min(76vh,900px);min-height:360px;position:relative;overflow:hidden;background:var(--np-bg);outline:none;touch-action:none;user-select:none}
.np-canvas{position:absolute;left:50%;top:50%;width:max-content;height:max-content;transform-origin:center center;will-change:transform;cursor:default}
.np-canvas.np-pannable{cursor:grab}
.np-canvas.np-dragging{cursor:grabbing}
.np-canvas img{display:block;width:auto;height:auto;max-width:min(88vw,1080px);max-height:calc(min(76vh,900px) - 32px);box-shadow:0 4px 24px rgba(17,24,39,.2);pointer-events:none}
.np-side{position:absolute;top:50%;transform:translateY(-50%);z-index:15;width:48px;height:48px;border:0;border-radius:50%;background:rgba(255,255,255,.94);box-shadow:0 3px 14px rgba(0,0,0,.18);font-size:2.1rem;line-height:1;color:#1f2937;cursor:pointer}
.np-side:hover{background:#fff;transform:translateY(-50%) scale(1.04)}
.np-side:disabled{opacity:.3}
.np-side-left{left:14px}.np-side-right{right:14px}
.np-pan-hint{position:absolute;z-index:10;left:50%;bottom:14px;transform:translateX(-50%);background:rgba(17,24,39,.72);color:#fff;border-radius:20px;padding:7px 12px;font-size:.76rem;pointer-events:none;opacity:0;transition:opacity .2s}
.np-stage.np-show-hint .np-pan-hint{opacity:1}

.np-bottombar{background:#fff;border-top:1px solid var(--np-line);padding:9px 12px}
.np-progress{height:4px;border-radius:8px;background:#e5e7eb;overflow:hidden}
.np-progress span{display:block;height:100%;width:8.333%;background:var(--np-accent);transition:width .2s}
.np-thumbs{display:flex;gap:6px;overflow-x:auto;padding-top:8px;scrollbar-width:thin}
.np-thumb{flex:0 0 56px;height:42px;padding:2px;border:1px solid var(--np-line);border-radius:5px;background:#fff;cursor:pointer;opacity:.65}
.np-thumb.active{opacity:1;border:2px solid var(--np-accent)}
.np-thumb img{width:100%;height:100%;object-fit:contain;display:block}

@media(max-width:700px){
  .np-topbar{height:auto;min-height:54px;padding:7px}
  .np-pageinfo strong{display:none}
  .np-controls{gap:4px}
  .np-controls button{min-width:34px;height:36px;padding:0 7px}
  .np-divider{margin:0 1px}
  .np-stage{height:72svh;min-height:300px}
  .np-canvas img{max-width:92vw;max-height:calc(72svh - 22px)}
  .np-side{width:40px;height:40px;font-size:1.8rem}
  .np-side-left{left:7px}.np-side-right{right:7px}
  .np-thumb{flex-basis:48px;height:36px}
}
.np-viewer:fullscreen{border:0;border-radius:0;width:100vw;height:100vh;max-width:none}
.np-viewer:fullscreen .np-stage{height:calc(100vh - 58px - 65px)}