:root{
  --ink:#171717;--muted:#707070;--line:#e7e7e7;--soft:#f6f6f6;--accent:#111;
  --page-w:152.4mm;--page-h:228.6mm;--zoom:.92;
  --inside:22mm;--outside:16mm;--top:18mm;--bottom:20mm;--gutter:4mm;
  --body-font:"Noto Serif",serif;--heading-font:"Noto Sans",sans-serif;--subheading-font:"Noto Sans",sans-serif;--h3-font:"Noto Sans",sans-serif;
  --body-size:10.5pt;--body-leading:15pt;--body-align:justify;--body-weight:400;--indent:5mm;--para-before:0pt;--para-after:2pt;--letter-space:0pt;--word-space:0pt;
  --heading-size:24pt;--heading-leading:29pt;--heading-weight:700;--heading-align:left;--heading-after:16pt;--heading-top:0mm;--heading-width:100%;--heading-letter-space:0pt;
  --subheading-size:15pt;--subheading-leading:20pt;--subheading-weight:600;--subheading-align:left;--subheading-before:14pt;--subheading-after:7pt;--subheading-letter-space:0pt;
  --h3-size:12pt;--h3-leading:16pt;--h3-weight:600;--h3-align:left;--h3-before:10pt;--h3-after:5pt;
  --page-title-font:"Noto Sans",sans-serif;--page-title-size:8pt;--folio-font:"Noto Sans",sans-serif;--folio-size:8pt;
  --tp-font:"Noto Sans",sans-serif;--tp-title-size:30pt;--tp-title-leading:36pt;--tp-subtitle-size:14pt;--tp-author-size:12pt;--tp-imprint-size:9pt;--tp-vertical:87mm;--tp-width:78%;--tp-align:center;
}
*{box-sizing:border-box}html,body{height:100%;margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:#f3f3f3;overflow:hidden}button,input,select,textarea{font:inherit;color:inherit}
.topbar{height:64px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 22px;background:#fff;position:relative;z-index:20}.brand{display:flex;gap:11px;align-items:center}.mark{width:34px;height:34px;border-radius:10px;background:#111;color:#fff;display:grid;place-items:center;font-family:Georgia,serif;font-weight:700}.brand strong{font-size:15px;display:block}.brand span{font-size:11px;color:var(--muted);display:block;margin-top:1px}.status{font-size:12px;color:var(--muted);padding:8px 11px;border:1px solid var(--line);border-radius:999px;background:#fff}
.workspace{height:calc(100vh - 64px);display:grid;grid-template-columns:minmax(650px,1.55fr) minmax(460px,.78fr);gap:12px;padding:12px;background:#f3f3f3;overflow:hidden}.app-pane{background:#fff;border:1px solid #e1e1e1;border-radius:17px;min-width:0;min-height:0;box-shadow:0 1px 2px rgba(0,0,0,.02)}
.preview-shell{display:grid;grid-template-rows:64px minmax(0,1fr);overflow:hidden}.preview-toolbar{display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--line);background:#fff}.preview-toolbar strong{font-size:13px}.preview-toolbar>div:first-child>span{font-size:10px;color:var(--muted);margin-left:8px}.preview-actions{display:flex;align-items:center;gap:14px}.zoom-control{font-size:10px;color:#666;display:flex;align-items:center;gap:7px}.zoom-control input{width:100px}.zoom-control span{min-width:30px}.preview-nav{display:flex;align-items:center;gap:7px}.preview-nav button{width:32px;height:32px;border:1px solid var(--line);background:#fff;border-radius:8px;cursor:pointer}.preview-nav span{font-size:10px;color:var(--muted);min-width:76px;text-align:center}.preview-stage{overflow:auto;display:grid;place-items:start center;padding:38px;position:relative;background:#ededed}.page-wrap{width:calc(var(--page-w) * var(--zoom));height:calc(var(--page-h) * var(--zoom));position:relative;flex:0 0 auto}.book-page{width:var(--page-w);height:var(--page-h);background:#fff;box-shadow:0 9px 30px rgba(0,0,0,.14);transform:scale(var(--zoom));transform-origin:top left;position:absolute;overflow:hidden;color:#111}.page-content{position:absolute;overflow:hidden;left:calc(var(--inside) + var(--gutter));right:var(--outside);top:var(--top);bottom:var(--bottom);font-family:var(--body-font);font-size:var(--body-size);line-height:var(--body-leading);font-weight:var(--body-weight);text-align:var(--body-align);letter-spacing:var(--letter-space);word-spacing:var(--word-space)}.book-page.even .page-content{left:var(--outside);right:calc(var(--inside) + var(--gutter))}.page-content p{margin:var(--para-before) 0 var(--para-after);text-indent:var(--indent)}.page-content.no-indent-after h1+p,.page-content.no-indent-after h2+p,.page-content.no-indent-after h3+p{text-indent:0}.page-content h1{font-family:var(--heading-font);font-size:var(--heading-size);line-height:var(--heading-leading);font-weight:var(--heading-weight);text-align:var(--heading-align);letter-spacing:var(--heading-letter-space);margin:var(--heading-top) 0 var(--heading-after);max-width:var(--heading-width)}.page-content h2{font-family:var(--subheading-font);font-size:var(--subheading-size);line-height:var(--subheading-leading);font-weight:var(--subheading-weight);text-align:var(--subheading-align);letter-spacing:var(--subheading-letter-space);margin:var(--subheading-before) 0 var(--subheading-after)}.page-content h3{font-family:var(--h3-font);font-size:var(--h3-size);line-height:var(--h3-leading);font-weight:var(--h3-weight);text-align:var(--h3-align);margin:var(--h3-before) 0 var(--h3-after)}.page-content blockquote{margin:3mm 5mm 3mm 8mm;font-style:italic}.page-content .li{margin-left:6mm;text-indent:0}.page-content .source-break{font:7pt/1.2 -apple-system,sans-serif;color:#aaa;border-top:1px dashed #ddd;margin:3mm 0;padding-top:1mm;text-indent:0}
.page-title{position:absolute;top:3.5mm;left:calc(var(--inside) + var(--gutter));right:var(--outside);font-family:var(--page-title-font);font-size:var(--page-title-size);color:#666;line-height:1.2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.book-page.even .page-title{left:var(--outside);right:calc(var(--inside) + var(--gutter))}.folio{position:absolute;bottom:5mm;left:0;right:0;text-align:center;font-family:var(--folio-font);font-size:var(--folio-size);color:#666}.empty-state{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:#999}.empty-state strong{font-family:-apple-system,sans-serif;font-size:14px}.empty-state span{font-family:-apple-system,sans-serif;font-size:10px;margin-top:5px}
.title-page-preview{position:absolute;inset:0;display:flex;flex-direction:column;box-sizing:border-box;font-family:var(--tp-font);padding-left:calc((100% - var(--tp-width))/2);padding-right:calc((100% - var(--tp-width))/2);padding-top:var(--tp-vertical);text-align:var(--tp-align);align-items:center}.title-page-preview.align-left{align-items:flex-start}.title-page-preview.align-right{align-items:flex-end}.title-page-preview .tp-title{width:100%;font-size:var(--tp-title-size);line-height:var(--tp-title-leading);font-weight:700}.title-page-preview .tp-subtitle{width:100%;font-size:var(--tp-subtitle-size);line-height:1.35;color:#444;margin-top:5mm}.title-page-preview .tp-author{width:100%;font-size:var(--tp-author-size);margin-top:18mm}.title-page-preview .tp-imprint{width:100%;font-size:var(--tp-imprint-size);color:#555;margin-top:auto;padding-bottom:18mm}
.control-shell{display:grid;grid-template-rows:minmax(0,1fr) 78px;overflow:hidden}.controls-scroll{overflow:auto;padding:18px 18px 30px;background:#fff}.controls-footer{border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 17px;background:#fff;position:relative}.controls-footer>div:first-child strong{display:block;font-size:12px}.controls-footer>div:first-child span{display:block;font-size:10px;color:var(--muted);margin-top:3px}
.panel{border:1px solid var(--line);border-radius:15px;padding:18px;margin-bottom:14px;background:#fff}.section-head{display:flex;justify-content:space-between;margin-bottom:16px}.section-head h2{font-size:15px;margin:0 0 4px}.section-head p{font-size:11px;line-height:1.45;color:var(--muted);margin:0}.dropzone{height:120px;border:1px dashed #cfcfcf;background:#fafafa;border-radius:13px;display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;transition:.15s}.dropzone.drag{border-color:#111;background:#f2f2f2}.dropzone input{display:none}.dropicon{font-size:22px;line-height:1;margin-bottom:7px}.dropzone strong{font-size:13px}.dropzone span{font-size:10px;color:var(--muted);margin-top:4px}.links-row{margin-top:11px}.links-row textarea{width:100%;height:82px;resize:vertical;border:1px solid var(--line);border-radius:10px;padding:10px;font-size:11px;outline:none}.secondary,.tiny-button{border:1px solid var(--line);background:#fff;border-radius:9px;padding:8px 11px;font-size:11px;cursor:pointer}.secondary{margin-top:7px}.source-list{display:flex;flex-direction:column;gap:6px;margin-top:9px}.source-item{font-size:10px;background:var(--soft);padding:7px 9px;border-radius:8px;display:flex;justify-content:space-between;gap:8px}.field{margin-bottom:12px}.field:last-child{margin-bottom:0}.field label{display:block;font-size:11px;color:#555;margin:0 0 6px}.field input,.field select{width:100%;height:42px;border:1px solid var(--line);border-radius:9px;background:#fff;padding:0 10px;font-size:12px;outline:none}.field input:focus,.field select:focus,.links-row textarea:focus,.current-page-editor input:focus{border-color:#888}.pair,.triple,.quad{display:grid;gap:9px}.pair{grid-template-columns:1fr 1fr}.triple{grid-template-columns:repeat(3,1fr)}.quad{grid-template-columns:repeat(4,1fr)}.quad .field label{font-size:10px}.quad input,.quad select{padding:0 7px}.toggle{display:flex;align-items:center;gap:9px;font-size:11px;color:#555;margin:10px 0;cursor:pointer}.toggle input{display:none}.toggle span{width:30px;height:18px;background:#d8d8d8;border-radius:20px;position:relative;transition:.15s}.toggle span:after{content:"";position:absolute;width:14px;height:14px;background:#fff;border-radius:50%;left:2px;top:2px;box-shadow:0 1px 3px #aaa;transition:.15s}.toggle input:checked+span{background:#111}.toggle input:checked+span:after{transform:translateX(12px)}
.font-picker{position:relative}.font-button{width:100%;height:48px;border:1px solid var(--line);border-radius:10px;background:#fff;padding:0 11px;text-align:left;display:flex;align-items:center;justify-content:space-between;cursor:pointer;font-size:14px}.font-pop{position:absolute;left:0;right:0;top:52px;background:#fff;border:1px solid var(--line);border-radius:11px;box-shadow:0 12px 30px rgba(0,0,0,.14);z-index:50;padding:8px;max-height:320px;display:flex;flex-direction:column}.font-search{height:36px;border:1px solid var(--line);border-radius:8px;padding:0 9px;margin-bottom:7px;font-size:11px}.font-list{overflow:auto}.font-option{display:block;width:100%;border:0;background:#fff;text-align:left;padding:9px;border-radius:7px;cursor:pointer;font-size:14px}.font-option:hover{background:#f4f4f4}.hidden{display:none!important}details summary{font-size:12px;font-weight:600;cursor:pointer}.details-body{padding-top:12px}.microcopy{font-size:10px;line-height:1.5;color:var(--muted);margin:8px 0 0}.current-page-editor{background:#f8f8f8;border:1px solid #ececec;border-radius:11px;padding:12px;margin-top:8px}.current-page-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.current-page-head strong{font-size:11px}.current-page-head span{display:block;font-size:9px;color:var(--muted);margin-top:2px}.current-page-editor input{width:100%;height:42px;border:1px solid var(--line);border-radius:9px;padding:0 10px;background:#fff;font-size:12px;outline:none}.current-page-editor small{display:block;font-size:9px;line-height:1.45;color:var(--muted);margin-top:7px}.tiny-button{font-size:9px;padding:6px 8px}.export-wrap{position:relative}.primary{background:#111;color:#fff;border:0;border-radius:10px;padding:11px 17px;font-size:12px;cursor:pointer}.export-menu{position:absolute;right:0;bottom:48px;width:240px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 14px 40px rgba(0,0,0,.16);padding:6px;z-index:80}.export-menu button{display:flex;width:100%;border:0;background:#fff;padding:10px;border-radius:8px;text-align:left;cursor:pointer;align-items:center;justify-content:space-between}.export-menu button:hover{background:#f4f4f4}.export-menu b{font-size:11px}.export-menu span{font-size:9px;color:var(--muted)}.toast{position:fixed;right:22px;bottom:22px;background:#111;color:#fff;border-radius:10px;padding:11px 14px;font-size:11px;z-index:100;max-width:420px;box-shadow:0 10px 30px rgba(0,0,0,.22)}
@media(max-width:1250px){.workspace{grid-template-columns:minmax(560px,1fr) 440px}.quad{grid-template-columns:1fr 1fr}.preview-stage{padding:28px}}@media(max-width:900px){html,body{overflow:auto}.topbar{position:sticky;top:0}.workspace{height:auto;display:flex;flex-direction:column;padding:10px;overflow:visible}.preview-shell{height:74vh;min-height:620px;order:1}.control-shell{height:78vh;min-height:640px;order:2}.pair,.triple,.quad{grid-template-columns:1fr 1fr}}@media(max-width:600px){.pair,.triple,.quad{grid-template-columns:1fr}.preview-toolbar{align-items:flex-start;padding-top:10px}.preview-actions{gap:5px;flex-direction:column;align-items:flex-end}.zoom-control input{width:70px}}