.fb-cover-tool{
  --fb-navy:#122636;
  --fb-blue:#1f5d8c;
  --fb-blue-soft:#e9f1f7;
  --fb-line:#d6dbe0;
  --fb-muted:#5c6a75;
  --fb-paper:#fbf9f3;
  --fb-rose:#b03e7e;
  --fb-amber:#b4602f;
  accent-color:var(--fb-blue);
  background:
    radial-gradient(circle at 82% 8%,rgba(31,93,140,.10),transparent 24rem),
    var(--fb-paper);
}
.fb-cover-tool [hidden]{display:none!important}
.fb-cover-tool .article-reading article>.fb-answer{
  display:grid;
  grid-template-columns:minmax(0,1fr) 286px;
  gap:20px 30px;
  margin-top:4px;
  padding:26px 30px 24px;
  border:1px solid #cdd5dd;
  border-radius:10px;
  background:
    linear-gradient(135deg,rgba(31,93,140,.055),transparent 44%),
    #fff;
  box-shadow:0 20px 46px rgba(18,38,54,.07);
}
.fb-cover-tool .fb-answer-copy{min-width:0;align-self:center}
.fb-cover-tool .fb-answer h1,
.fb-cover-tool h2,
.fb-cover-tool h3{
  font-family:Georgia,"Times New Roman",serif;
}
.fb-cover-tool .fb-answer h1{
  max-width:15ch;
  margin:0;
  color:var(--fb-navy);
  font-size:clamp(40px,5vw,64px);
  line-height:1.02;
  letter-spacing:-.05em;
}
.fb-cover-tool .fb-answer h1 span{color:var(--fb-blue)}
.fb-cover-tool .fb-answer .article-meta{
  margin:11px 0 14px;
  color:var(--fb-muted);
  font-size:13px;
}
.fb-cover-tool .fb-answer .lead{
  max-width:70ch;
  margin:0;
  color:#31414d;
  font-size:17px;
  line-height:1.7;
}
.fb-cover-tool .fb-answer .lead strong{color:var(--fb-navy)}
.fb-cover-tool .answer-note{
  max-width:70ch;
  margin:10px 0 0;
  color:var(--fb-muted);
  font-size:13.5px;
  line-height:1.65;
}
.fb-cover-tool .hero-upload{
  display:flex;
  position:relative;
  align-items:center;
  gap:12px;
  max-width:430px;
  min-height:58px;
  margin-top:16px;
  padding:11px 16px;
  border:1px solid #8faec6;
  border-radius:7px;
  background:var(--fb-blue-soft);
  color:var(--fb-navy);
  cursor:pointer;
}
.fb-cover-tool .hero-upload:hover{border-color:var(--fb-blue)}
.fb-cover-tool .hero-upload:focus-within{outline:3px solid rgba(31,93,140,.26);outline-offset:2px}
.fb-cover-tool .hero-upload-mark{
  display:grid;
  flex:0 0 36px;
  width:36px;
  height:36px;
  place-items:center;
  border-radius:50%;
  background:var(--fb-blue);
  color:#fff;
  font:700 18px/1 Arial,Helvetica,sans-serif;
}
.fb-cover-tool .hero-upload strong{display:block;font-size:14px}
.fb-cover-tool .hero-upload small{display:block;margin-top:2px;color:#526675;font-size:11px;line-height:1.4}
.fb-cover-tool .file-input{position:absolute;width:1px;height:1px;overflow:hidden;opacity:0}
.fb-cover-tool .fb-ticket{
  position:relative;
  display:flex;
  min-height:238px;
  flex-direction:column;
  justify-content:space-between;
  padding:20px;
  border-radius:8px;
  background:
    linear-gradient(90deg,rgba(255,255,255,.055) 1px,transparent 1px),
    linear-gradient(rgba(255,255,255,.055) 1px,transparent 1px),
    var(--fb-navy);
  background-size:22px 22px,22px 22px,auto;
  color:#fff;
  overflow:hidden;
}
.fb-cover-tool .fb-ticket::after{
  content:"851";
  position:absolute;
  right:-10px;
  bottom:-18px;
  color:rgba(255,255,255,.05);
  font:800 92px/1 Arial,Helvetica,sans-serif;
  letter-spacing:-.08em;
}
.fb-cover-tool .ticket-kicker{
  position:relative;
  z-index:1;
  margin:0;
  color:#9ec8e4;
  font:700 10px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing:.14em;
  text-transform:uppercase;
}
.fb-cover-tool .ticket-number{
  position:relative;
  z-index:1;
  margin:14px 0 4px;
  color:#fff;
  font:800 34px/1 Arial,Helvetica,sans-serif;
  letter-spacing:-.05em;
}
.fb-cover-tool .ticket-sub{
  position:relative;
  z-index:1;
  margin:0 0 12px;
  color:#b9c9d5;
  font-size:12px;
  line-height:1.5;
}
.fb-cover-tool .ticket-bars{position:relative;z-index:1;display:grid;gap:8px;margin:0}
.fb-cover-tool .ticket-bar{display:grid;grid-template-columns:64px 1fr auto;align-items:center;gap:8px;color:#d9e5ee;font-size:10.5px}
.fb-cover-tool .ticket-track{display:block;height:8px;border-radius:2px;background:rgba(255,255,255,.14);overflow:hidden}
.fb-cover-tool .ticket-track i{display:block;height:100%;border-radius:2px}
.fb-cover-tool .ticket-bar b{color:#9ec8e4;font-weight:700;font-variant-numeric:tabular-nums}
.fb-cover-tool .bar-desktop{width:65.8%;background:#6ea9d2}
.fb-cover-tool .bar-mobile{width:88.8%;background:#e0a273}
.fb-cover-tool .ticket-overlap{
  position:relative;
  z-index:1;
  margin:12px 0 0;
  padding-top:10px;
  border-top:1px solid rgba(255,255,255,.14);
  color:#f0c3d9;
  font-size:11px;
  line-height:1.5;
}
.fb-cover-tool .surface-strip{
  grid-column:1/-1;
  display:grid;
  grid-template-columns:1.2fr 1fr 1fr;
  gap:9px;
}
.fb-cover-tool .surface-row{
  min-width:0;
  padding:12px 14px;
  border:1px solid var(--fb-line);
  border-radius:6px;
  background:#fff;
  color:#4d5c67;
  font-size:12px;
  line-height:1.55;
}
.fb-cover-tool .surface-row:first-child{border-color:#a9c2d5;background:#f2f7fa}
.fb-cover-tool .surface-row span{
  display:block;
  color:var(--fb-blue);
  font:700 9px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing:.11em;
  text-transform:uppercase;
}
.fb-cover-tool .surface-row strong{display:block;margin:4px 0 2px;color:var(--fb-navy);font-size:14px;letter-spacing:-.01em}
.fb-cover-tool .table-scroll{max-width:100%;overflow-x:auto;overscroll-behavior-inline:contain}
.fb-cover-tool .table-scroll table{min-width:960px;margin-top:20px;table-layout:fixed}
.fb-cover-tool .table-scroll caption{text-align:left;overflow-wrap:anywhere}
.fb-cover-tool .table-scroll th,
.fb-cover-tool .table-scroll td{overflow-wrap:anywhere}
.fb-cover-tool .scope-note{
  max-width:78ch;
  padding:12px 14px;
  border-left:3px solid var(--fb-amber);
  background:#fbf4ee;
  color:#4b3a2d;
  font-size:14px;
}
.fb-cover-tool .frame-figure{margin:22px 0 0}
.fb-cover-tool .frame-figure img{width:100%;height:auto;border:1px solid var(--fb-line);border-radius:7px;background:#f7f4ec}
.fb-cover-tool .frame-figure figcaption{max-width:78ch;margin-top:9px;color:var(--fb-muted);font-size:13px;line-height:1.6}
.fb-cover-tool .avatar-figure{max-width:420px}
.fb-cover-tool .formula{background:#edf3f7;color:#173247}
.fb-cover-tool .math-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:18px 0 0}
.fb-cover-tool .math-list div{border:1px solid var(--fb-line);border-radius:7px;background:#fff;padding:13px 14px;min-width:0}
.fb-cover-tool .math-list dt{color:var(--fb-blue);font:700 10px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.09em;text-transform:uppercase}
.fb-cover-tool .math-list dd{margin:7px 0 0;color:var(--fb-navy);font-size:16px;font-weight:700;font-variant-numeric:tabular-nums}
.fb-cover-tool .math-list small{display:block;margin-top:3px;color:var(--fb-muted);font-size:11.5px;font-weight:400;line-height:1.45}

/* Local two-frame tool */
.fb-cover-tool .fb-workspace{
  display:grid;
  grid-template-columns:320px minmax(0,1fr);
  align-items:start;
  gap:24px;
  margin-top:22px;
}
.fb-cover-tool .fb-editor{
  border:1px solid var(--fb-line);
  border-radius:8px;
  background:#fff;
  padding:20px;
}
.fb-cover-tool .fb-editor h2{
  margin:0 0 12px;
  font-size:19px;
  letter-spacing:-.02em;
}
.fb-cover-tool .fb-drop{
  display:grid;
  place-items:center;
  gap:4px;
  min-height:92px;
  padding:14px;
  border:1.5px dashed #a9bccb;
  border-radius:7px;
  background:#f6f9fb;
  text-align:center;
  cursor:pointer;
}
.fb-cover-tool .fb-drop.drag{border-color:var(--fb-blue);background:var(--fb-blue-soft)}
.fb-cover-tool .fb-drop strong{font-size:13px;font-weight:600}
.fb-cover-tool .fb-drop small{color:var(--fb-muted);font-size:11.5px;line-height:1.45}
.fb-cover-tool .fb-choose{
  width:100%;
  min-height:44px;
  margin:9px 0 0;
  border:1px solid #b8c7d2;
  border-radius:6px;
  background:#fff;
  color:var(--fb-blue);
  font:600 13px/1.2 Arial,Helvetica,sans-serif;
  cursor:pointer;
}
.fb-cover-tool .fb-choose:hover{border-color:var(--fb-blue);background:var(--fb-blue-soft)}
.fb-cover-tool #fileinfo{margin:10px 0 14px;color:var(--fb-muted);font-size:12.5px;line-height:1.5;overflow-wrap:anywhere}
.fb-cover-tool .fb-field{display:block;margin:13px 0 0;font-size:13px;color:var(--fb-navy)}
.fb-cover-tool .fb-field select{
  width:100%;
  min-height:44px;
  margin-top:6px;
  border:1px solid #c6d2da;
  border-radius:6px;
  background:#fff;
  color:var(--fb-navy);
  font:14px/1.4 Arial,Helvetica,sans-serif;
  padding:9px 11px;
}
.fb-cover-tool .fb-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.fb-cover-tool .fb-field input[type=range]{width:100%;margin:9px 0 0}
.fb-cover-tool .fb-field input[type=color]{width:100%;height:44px;margin-top:6px;border:1px solid #c6d2da;border-radius:6px;background:#fff;padding:3px}
.fb-cover-tool .fb-field output{float:right;color:var(--fb-muted);font-size:12px}
.fb-cover-tool .fb-mask-field{
  display:flex;
  align-items:flex-start;
  gap:9px;
  margin:15px 0 0;
  padding:10px 11px;
  border:1px solid var(--fb-line);
  border-radius:6px;
  background:#fdf7fb;
  color:#553a4b;
  font-size:12.5px;
  line-height:1.5;
}
.fb-cover-tool .fb-mask-field input{margin:3px 0 0;accent-color:var(--fb-rose)}
.fb-cover-tool .fb-note{margin:13px 0 0;color:var(--fb-muted);font-size:11.5px;line-height:1.55}
.fb-cover-tool .privacy{font-size:11.5px;line-height:1.6;color:var(--fb-muted)}
.fb-cover-tool #error{min-height:0;margin:10px 0 0;color:#9b2929;font-size:12.5px;line-height:1.5}
.fb-cover-tool .fb-outputs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;min-width:0}
.fb-cover-tool #retry,
.fb-cover-tool .source-line{grid-column:1/-1}
.fb-cover-tool .fb-export{
  min-width:0;
  border:1px solid var(--fb-line);
  border-radius:8px;
  background:#fff;
  padding:16px 16px 14px;
}
.fb-cover-tool .fb-export-head{
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:11px;
  flex-wrap:wrap;
}
.fb-cover-tool .fb-export-head h3{margin:0;font-size:17px;letter-spacing:-.02em}
.fb-cover-tool .fb-chip{
  padding:3px 7px;
  border-radius:4px;
  background:var(--fb-blue-soft);
  color:var(--fb-blue);
  font:700 11px/1.3 ui-monospace,SFMono-Regular,Menlo,monospace;
}
.fb-cover-tool .fb-export[data-frame=mobile] .fb-chip{background:#fbf0e9;color:var(--fb-amber)}
.fb-cover-tool .fb-export-head p{margin:0 0 0 auto;color:var(--fb-muted);font-size:11.5px}
.fb-cover-tool .fb-preview{
  position:relative;
  border:1px solid #dfe4e8;
  border-radius:6px;
  background:#eef1f3;
  overflow:hidden;
}
.fb-cover-tool .fb-preview[data-ratio=desktop]{aspect-ratio:560/315}
.fb-cover-tool .fb-preview[data-ratio=mobile]{aspect-ratio:756/315}
.fb-cover-tool .fb-preview img{display:block;width:100%;height:100%;object-fit:contain}
.fb-cover-tool .fb-empty{
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  margin:0;
  padding:16px;
  color:var(--fb-muted);
  font-size:13px;
  text-align:center;
}
.fb-cover-tool .avatar-mask{
  position:absolute;
  left:0;
  bottom:0;
  box-sizing:border-box;
  width:calc(100% * 40 / 756);
  height:calc(100% * 40 / 315);
  border:2px dashed #fff;
  border-left:0;
  border-bottom:0;
  border-radius:0 100% 0 0;
  background:rgba(18,38,54,.42);
  pointer-events:none;
}
.fb-cover-tool .mask-off .avatar-mask{display:none}
.fb-cover-tool .mask-legend{
  display:flex;
  align-items:flex-start;
  gap:6px;
  margin:7px 0 0;
  color:#7b516a;
  font-size:11px;
  line-height:1.45;
}
.fb-cover-tool .mask-swatch{
  flex:0 0 12px;
  width:12px;
  height:12px;
  margin-top:1px;
  border:1.5px dashed #3c5668;
  border-radius:0 100% 0 0;
  background:rgba(18,38,54,.42);
}
.fb-cover-tool .fb-status{margin:9px 0 0;color:var(--fb-navy);font-size:13px;font-weight:600;line-height:1.5;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.fb-cover-tool .fb-area{margin:4px 0 0;color:var(--fb-muted);font-size:12px;line-height:1.5}
.fb-cover-tool .fb-checks{
  margin:10px 0 0;
  padding:10px 0 0;
  border-top:1px solid #edf0f2;
  list-style:none;
  display:grid;
  gap:5px;
}
.fb-cover-tool .fb-checks li{
  position:relative;
  padding-left:13px;
  color:#4d5c67;
  font-size:11.5px;
  line-height:1.5;
}
.fb-cover-tool .fb-checks li::before{
  content:"";
  position:absolute;
  left:0;
  top:.52em;
  width:5px;
  height:5px;
  border-radius:50%;
  background:#9aa8b2;
}
.fb-cover-tool .fb-checks li.ok::before{background:#2c7a5b}
.fb-cover-tool .fb-checks li.warn::before{background:#b4602f}
.fb-cover-tool .fb-checks li.neutral::before{background:#8aa0ae}
.fb-cover-tool .fb-downloads{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:11px}
.fb-cover-tool .fb-downloads button{
  min-height:44px;
  padding:10px 15px;
  border:0;
  border-radius:6px;
  background:var(--fb-blue);
  color:#fff;
  font:600 13px/1.2 Arial,Helvetica,sans-serif;
  cursor:pointer;
}
.fb-cover-tool .fb-downloads button:hover:not(:disabled){background:#174765}
.fb-cover-tool .fb-downloads button:disabled{opacity:.5;cursor:not-allowed}
.fb-cover-tool #retry{
  min-height:40px;
  padding:8px 13px;
  border:1px solid #d2b9a9;
  border-radius:6px;
  background:#fbf3ed;
  color:#8a4a28;
  font:600 12.5px/1.2 Arial,Helvetica,sans-serif;
  cursor:pointer;
}
.fb-cover-tool .source-line{max-width:78ch;margin:12px 0 0;color:var(--fb-muted);font-size:12px;line-height:1.55}
.fb-cover-tool .study-figures{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:20px 0 0}
.fb-cover-tool .study-figures figure{margin:0}
.fb-cover-tool .study-figures img{width:100%;height:auto;border:1px solid var(--fb-line);border-radius:7px;background:#f7f4ec}
.fb-cover-tool .study-figures figcaption{margin-top:7px;color:var(--fb-muted);font-size:12px;line-height:1.55}
.fb-cover-tool .preview-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:18px 0 0;justify-items:start}
.fb-cover-tool .preview-grid figure{margin:0;max-width:100%}
.fb-cover-tool .preview-grid img{display:block;width:320px;max-width:100%;height:auto;border:1px solid var(--fb-line);border-radius:6px;background:#eef1f3}
.fb-cover-tool .preview-grid figcaption{margin-top:6px;color:var(--fb-muted);font-size:11.5px;line-height:1.5;font-variant-numeric:tabular-nums}
.fb-cover-tool .checklist{padding-left:20px;display:grid;gap:10px}
.fb-cover-tool .checklist li{padding-left:2px}
.fb-cover-tool details{border:1px solid var(--fb-line);border-radius:7px;background:#fff;padding:0 14px;margin-top:10px}
.fb-cover-tool details summary{cursor:pointer;padding:13px 0;font-weight:600;color:var(--fb-navy);min-height:44px;display:flex;align-items:center}
.fb-cover-tool details p{margin:0 0 13px;max-width:80ch}
.fb-cover-tool .source-list{display:grid;gap:9px;padding-left:19px}
.fb-cover-tool .source-list li{line-height:1.6}

@media(max-width:1000px){
  .fb-cover-tool .fb-workspace{grid-template-columns:1fr}
  .fb-cover-tool .fb-editor{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}
  .fb-cover-tool .fb-editor h2,
  .fb-cover-tool .fb-editor .fb-drop,
  .fb-cover-tool .fb-editor .fb-choose,
  .fb-cover-tool .fb-editor #fileinfo,
  .fb-cover-tool .fb-editor .fb-mask-field,
  .fb-cover-tool .fb-editor .fb-note,
  .fb-cover-tool .fb-editor .privacy,
  .fb-cover-tool .fb-editor #error{grid-column:1/-1}
}
@media(max-width:820px){
  .fb-cover-tool .article-reading article>.fb-answer{grid-template-columns:1fr;padding:22px 20px}
  .fb-cover-tool .fb-ticket{min-height:0}
  .fb-cover-tool .surface-strip{grid-template-columns:1fr}
  .fb-cover-tool .math-list{grid-template-columns:1fr}
  .fb-cover-tool .study-figures{grid-template-columns:1fr}
  .fb-cover-tool .table-scroll table{min-width:0}
}
@media(max-width:760px){
  .fb-cover-tool .fb-outputs{grid-template-columns:1fr}
}
@media(max-width:560px){
  .fb-cover-tool .fb-editor{display:block;padding:16px}
  .fb-cover-tool .fb-export{padding:13px}
  .fb-cover-tool .fb-export-head p{margin-left:0}
  .fb-cover-tool .preview-grid{grid-template-columns:1fr}
  .fb-cover-tool .fb-answer h1{font-size:clamp(34px,9vw,48px)}
}