:root{--bg:#f6f6f7;--island:#fff;--ink:#18181b;--sub:#8e8e96;--line:rgba(24,24,27,.08);--acc:#ff4f45;--shadow:0 1px 2px rgba(0,0,0,.04),0 8px 28px rgba(0,0,0,.08);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);font-synthesis:none}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;min-width:320px;background:var(--bg);background-image:radial-gradient(#d8d8dd 1px,transparent 1px);background-size:20px 20px;font-size:13px;line-height:1.5;overflow:hidden}
button,input,textarea{font:inherit;color:inherit}
button{cursor:pointer}
h1,h2{margin:0;font-size:inherit}
[hidden]{display:none!important}

.island{position:fixed;z-index:3;background:var(--island);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}
.divider{width:1px;height:22px;background:var(--line);flex:none}
.tool-button{position:relative;display:inline-flex;align-items:center;gap:6px;border:0;background:none;padding:7px 11px;border-radius:10px;font-weight:600;color:#3f3f46;white-space:nowrap}
.tool-button:hover,.tool-button[aria-expanded="true"]{background:#f1f1f3}
.tool-button svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.tool-button.icon-only{padding:10px}
.tool-button:disabled,.dark-button:disabled{opacity:.4;cursor:default}
.dark-button{border:0;background:var(--ink);color:#fff;border-radius:11px;padding:9px 16px;font-weight:700;white-space:nowrap}
.dark-button:hover:not(:disabled){background:#3a3a40}

.top-left{top:16px;left:16px;display:flex;align-items:center;gap:10px;padding:6px 6px 6px 8px}
.logo{display:block;width:30px;height:30px;border-radius:9px;object-fit:cover;box-shadow:0 0 0 1px var(--line);flex:none}
.top-left h1{font-size:14px;margin-right:4px;white-space:nowrap}
.side-tabs{display:flex;background:#f1f1f3;border-radius:10px;padding:3px}
.side-tab{border:0;background:none;padding:5px 12px;border-radius:8px;font-weight:600;color:var(--sub)}
.side-tab.is-active{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.12)}

.top-right{top:16px;right:16px;display:flex;gap:2px;padding:5px}
.upload-button{cursor:pointer}
.upload-button input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer}
.link-pop{top:72px;right:16px;z-index:4;width:360px;max-width:calc(100% - 32px);padding:12px}
.link-row{display:flex;gap:8px}
.url-field{flex:1;min-width:0}
.url-field input{width:100%;height:38px;padding:0 12px;border:1px solid var(--line);border-radius:10px;background:#f6f6f7;outline:none}
.url-field input:focus{border-color:var(--acc);background:#fff}
.source-note{margin:8px 2px 0;font-size:11.5px;color:var(--sub)}

.canvas{position:fixed;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:28px;padding:90px 360px 110px 40px}
.stage{position:relative;display:inline-block;max-width:100%;line-height:0;touch-action:none;user-select:none}
.stage img{display:block;max-width:min(100%,640px);max-height:calc(100vh - 300px);width:auto;height:auto;pointer-events:none;filter:drop-shadow(0 20px 40px rgba(0,0,0,.08))}
.canvas-hint{margin:0;font-size:12px;color:var(--sub)}
.guide{position:absolute;z-index:2;background:var(--acc);touch-action:none;outline:none}
.guide-v{top:-30px;bottom:-30px;width:2px;margin-left:-1px;cursor:ew-resize}
.guide-h{left:-30px;right:-30px;height:2px;margin-top:-1px;cursor:ns-resize}
.guide::before{content:"";position:absolute;inset:-9px}
.handle{position:absolute;width:12px;height:12px;border-radius:50%;background:#fff;border:2px solid var(--acc)}
.guide-v .handle{left:50%;top:-6px;transform:translateX(-50%)}
.guide-h .handle{top:50%;left:-6px;transform:translateY(-50%)}
.guide:focus-visible .handle{box-shadow:0 0 0 4px rgba(255,79,69,.3)}
.guide-value{position:absolute;font:600 10px/1 ui-monospace,SFMono-Regular,Menlo,monospace;font-style:normal;background:var(--acc);color:#fff;padding:3px 5px;border-radius:5px;opacity:0;transition:opacity .15s;white-space:nowrap;pointer-events:none}
.guide-v .guide-value{bottom:-22px;left:50%;transform:translateX(-50%)}
.guide-h .guide-value{right:-10px;top:50%;transform:translate(100%,-50%)}
.guide:hover .guide-value,.guide:focus-visible .guide-value,.guide.is-dragging .guide-value{opacity:1}

.controls{bottom:18px;left:calc(50% - 160px);transform:translateX(-50%);display:flex;align-items:center;gap:14px;padding:10px 16px;white-space:nowrap}
.range-control{display:flex;align-items:center;gap:8px;font-weight:600;color:#3f3f46}
.range-control input{width:96px;accent-color:var(--ink)}
.range-control output{width:26px;font:11px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--sub);font-variant-numeric:tabular-nums}
.slice-readout{font:11px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--sub)}
.slice-readout b{color:var(--ink);font-weight:600}

.preview-card{top:74px;right:16px;width:320px;padding:14px}
.preview-head{display:flex;align-items:center;margin-bottom:10px}
.preview-head h2{font-size:13px}
.preview-bgs{margin-left:auto;display:flex;gap:6px}
.preview-bgs button{width:18px;height:18px;padding:0;border-radius:50%;border:2px solid #fff;box-shadow:0 0 0 1px var(--line)}
.preview-bgs button.is-active{box-shadow:0 0 0 2px var(--ink)}
.preview{display:flex;flex-direction:column;gap:10px;padding:14px 10px;border-radius:12px;background:#ededf0;transition:background .2s}
.preview.is-dark{background:#1f1f23}
.preview-row{display:flex;align-items:flex-start;gap:8px}
.preview-row.is-me{flex-direction:row-reverse}
.avatar{flex:none;width:28px;height:28px;display:grid;place-items:center;border-radius:50%;background:#d4d4da;color:#fff;font-size:12px;font-weight:700}
.preview-row.is-me .avatar{background:#b3bfd0}
.preview-bubble{display:block;width:max-content;max-width:78%;border:0 solid transparent;border-image-repeat:stretch;color:#333;font-size:13px;line-height:1.5;white-space:pre-wrap;overflow-wrap:anywhere}

.warning{bottom:76px;right:16px;width:320px;max-width:calc(100% - 32px);margin:0;padding:10px 12px;background:#fff3e8;color:#a35f26;font-size:12px}
.actions{bottom:18px;right:16px;display:flex;gap:6px;padding:6px}
.copy-button{padding:10px 18px}
.code-sheet{right:16px;bottom:76px;z-index:4;width:420px;max-width:calc(100% - 32px);padding:14px;opacity:0;transform:translateY(12px);pointer-events:none;transition:opacity .2s,transform .2s}
.code-sheet.is-open{opacity:1;transform:none;pointer-events:auto}
.sheet-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:10px;color:var(--sub);font-size:12px}
.sheet-head h2{color:var(--ink);font-size:13px;white-space:nowrap}
#code{display:block;width:100%;height:260px;padding:14px;border:0;border-radius:10px;background:#18181b;color:#d4d4d8;font:11px/1.65 ui-monospace,SFMono-Regular,Menlo,monospace;resize:vertical;outline:none;white-space:pre;overflow:auto}
.sheet-note{margin:8px 2px 0;font-size:11.5px;color:var(--sub)}

.toast{position:fixed;bottom:84px;left:50%;transform:translate(-50%,12px);padding:10px 16px;border-radius:12px;background:#242428;color:#fff;font-size:13px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:10;white-space:nowrap;max-width:90vw;text-overflow:ellipsis;overflow:hidden}
.toast.is-visible{opacity:1;transform:translate(-50%,0)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

@media(max-width:900px){
  body{overflow:auto;height:auto}
  .page{display:flex;flex-direction:column;gap:12px;padding:12px}
  .island,.canvas,.code-sheet{position:static;transform:none}
  .page>*{min-width:0}
  .top-left{order:1}.side-tabs{margin-left:auto}
  .top-right{order:2;justify-content:space-between}
  .link-pop{order:3;width:auto;max-width:none}
  .canvas{order:4;padding:44px 34px 12px;overflow:hidden}
  .stage img{max-height:none}
  .controls{order:5;flex-wrap:wrap;white-space:normal}.controls .divider{display:none}
  .range-control{flex:1 1 100%}.range-control input{flex:1;width:auto}
  .preview-card{order:6;width:auto}
  .warning{order:7;width:auto;max-width:none}
  .actions{order:8}.copy-button{flex:1}
  .code-sheet{order:9;display:none;width:auto;max-width:none;opacity:1}
  .code-sheet.is-open{display:block}
  .toast{bottom:24px}
}