:root{--blue:#315cf5;--line:#dce3ef;--muted:#64748b;--bg:#f7f9fc;--text:#10213b}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.5 system-ui,-apple-system,Segoe UI,Arial,sans-serif}
header{background:#fff;border-bottom:1px solid var(--line);padding:15px 22px;display:flex;align-items:center;justify-content:center;gap:24px;position:sticky;top:0;z-index:5}
.brand{font-weight:800;font-size:19px;white-space:nowrap}.brand span{color:var(--blue)}.brand-subtitle{color:#64748b}
main{max-width:1120px;margin:24px auto;padding:0 16px}h1{font-size:34px;line-height:1.2;margin:12px 0 8px} .lead{color:var(--muted);margin:0 0 20px}
.panel{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:0 5px 22px #1c37600b}
.toolbar{display:flex;justify-content:flex-end;gap:8px;padding:12px 16px;border-bottom:1px solid var(--line);flex-wrap:wrap}
button,.file-label,select{font:inherit}button,.file-label{border:1px solid var(--line);background:#fff;border-radius:8px;padding:8px 12px;cursor:pointer;color:var(--text)}button:hover,.file-label:hover{border-color:var(--blue);color:var(--blue)}button.primary{background:var(--blue);color:white;border-color:var(--blue)}button.primary:hover{background:#2448d9;color:#fff}
.editors{display:grid;grid-template-columns:1fr 1fr;min-height:390px}.editor{padding:15px;border-right:1px solid var(--line);min-width:0}.editor:last-child{border:0}
.editor h3{font-size:14px;margin:0 0 9px}.editor textarea{width:100%;height:350px;resize:vertical;border:1px solid var(--line);border-radius:9px;padding:12px;font:13px/1.55 ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre;tab-size:2;outline:none}.editor textarea:focus{border-color:var(--blue)}
.options{padding:16px;border-top:1px solid var(--line)}.options-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:14px}.options-head strong{margin-right:auto}.options-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:9px 16px}.opt{display:flex;gap:8px;align-items:flex-start;font-size:14px}.opt input{margin-top:5px;accent-color:var(--blue)}.bottom{display:flex;gap:9px;flex-wrap:wrap;padding:15px 16px;border-top:1px solid var(--line)}
select{padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:#fff}.status{color:var(--muted);font-size:13px;margin-left:auto;align-self:center}.hint{font-size:13px;color:var(--muted);margin-top:12px}
.preview{border-top:1px solid var(--line);padding:14px 18px}.preview iframe{width:100%;height:220px;border:1px solid var(--line);border-radius:8px;background:white}
@media(max-width:760px){.editors{grid-template-columns:1fr}.editor{border-right:0;border-bottom:1px solid var(--line)}.options-grid{grid-template-columns:repeat(2,1fr)}h1{font-size:27px}header{justify-content:flex-start}}
@media(max-width:430px){.options-grid{grid-template-columns:1fr}}

/* Визуальный редактор */
.visual-editor{display:flex;flex-direction:column}
.visual-toolbar{display:flex;align-items:center;gap:4px;flex-wrap:wrap;padding:7px;background:#f6f8fb;border:1px solid var(--line);border-radius:9px 9px 0 0}
.visual-toolbar button{min-width:29px;padding:3px 7px;border:1px solid transparent;border-radius:4px;font-size:14px;line-height:1.4}
.visual-toolbar button:hover{background:#e9efff;border-color:#cbd7ff}
.visual-toolbar select{padding:4px 6px;font-size:12px;max-width:115px}
.tool-separator{height:22px;border-left:1px solid var(--line);margin:0 3px}
.visual-canvas{width:100%;height:310px;min-height:220px;overflow:auto;border:1px solid var(--line);border-top:0;border-radius:0 0 9px 9px;padding:12px;background:#fff;color:#17243b;font:14px/1.55 Arial,sans-serif;outline:none}
.visual-canvas:focus{border-color:var(--blue)}
.visual-canvas:empty:before{content:attr(data-placeholder);color:#94a3b8;pointer-events:none}
.visual-canvas h1{font-size:2em;margin:.67em 0}.visual-canvas h2{font-size:1.5em;margin:.83em 0}.visual-canvas h3{font-size:1.17em;margin:1em 0}.visual-canvas p{margin:0 0 1em}
@media(max-width:760px){.visual-canvas{height:280px}}

/* Подсветка синтаксиса HTML в правом редакторе */
.code-editor{position:relative;width:100%;height:350px;min-height:220px;border:1px solid var(--line);border-radius:9px;overflow:hidden;background:#fff}
.code-highlight,.code-editor textarea{position:absolute;inset:0;width:100%;height:100%;margin:0;padding:12px;border:0;border-radius:0;font:13px/1.55 ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre-wrap;overflow-wrap:break-word;tab-size:2;letter-spacing:normal}
.code-highlight{z-index:1;pointer-events:none;overflow:hidden;color:#17243b;background:#fff}
.code-editor textarea{z-index:2;resize:none;overflow:auto;background:transparent;color:transparent;-webkit-text-fill-color:transparent;caret-color:#17243b;outline:none}
.code-editor textarea::selection{background:rgba(65,110,230,.24);-webkit-text-fill-color:transparent}
.code-editor textarea:focus{border:0}
.tok-bracket{color:#64748b}.tok-tag{color:#00833e}.tok-attr{color:#c0392b}.tok-string{color:#bd4b00}.tok-comment{color:#8993a4;font-style:italic}.tok-entity{color:#8b42b5}
@media(max-width:760px){.code-editor{height:300px}}

/* Consistent visual preview after Word paste */
.visual-canvas{font-family:Arial,Helvetica,sans-serif}
.visual-canvas p{white-space:normal}

/* Fix top alignment of the syntax-highlighted code layer */
.code-editor{position:relative;display:block;isolation:isolate;overflow:hidden}
.code-editor .code-highlight{
  display:block!important;
  position:absolute!important;
  inset:0!important;
  box-sizing:border-box!important;
  width:100%!important;
  height:100%!important;
  min-height:0!important;
  margin:0!important;
  padding:12px!important;
  border:0!important;
  transform:none!important;
  text-align:left!important;
  vertical-align:top!important;
  line-height:1.55!important;
  white-space:pre-wrap!important;
  overflow-wrap:anywhere!important;
  overflow:hidden!important;
  align-self:flex-start!important;
}
.code-editor textarea{
  display:block!important;
  position:absolute!important;
  inset:0!important;
  box-sizing:border-box!important;
  width:100%!important;
  height:100%!important;
  min-height:0!important;
  margin:0!important;
  padding:12px!important;
  border:0!important;
  transform:none!important;
  text-align:left!important;
  vertical-align:top!important;
  line-height:1.55!important;
}