:root{
  --bg:#eef1f4; --panel:#fff; --ink:#263238; --muted:#607d8b; --line:#d5dce1;
  --ui-accent:#b71c1c; --ui-dark:#37474f;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,Helvetica,sans-serif}
.app{max-width:1180px;margin:auto;padding:24px}
h1{margin:0 0 6px;font-size:1.8rem}
.lead{margin:0 0 20px;color:var(--muted)}
.panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;margin-bottom:18px}
.grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.control{display:flex;flex-direction:column;gap:6px;font-weight:700;font-size:.92rem}
select,input[type="text"]{
  width:100%;padding:10px 11px;border:1px solid #b8c1c8;border-radius:7px;background:#fff;font-size:1rem
}
.actions,.toolbar{display:flex;gap:9px;flex-wrap:wrap}
.actions{margin-top:16px}
button{border:0;border-radius:7px;padding:10px 14px;font-size:.94rem;font-weight:700;cursor:pointer}
.primary{background:var(--ui-accent);color:#fff}
.secondary{background:var(--ui-dark);color:#fff}
.ghost{background:#eef1f3;border:1px solid #cbd3d8;color:#263238}
.danger-lite{background:#fff3f3;border:1px solid #e4bdbd;color:#8c1b1b}
.note,.status,.tiny{color:var(--muted);font-size:.88rem}
.warning{display:none;background:#fff7df;border:1px solid #e5cf8e;border-radius:7px;padding:10px 12px;margin-top:12px}
.checks{display:flex;gap:9px 18px;flex-wrap:wrap;margin-top:8px}
.checks label{font-weight:400}
#advanced{display:none;border-top:1px solid var(--line);margin-top:17px;padding-top:16px}

/* Presentación principal */
.presentation{margin-top:18px;border-top:1px solid var(--line);padding-top:16px}
.presentation-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:14px;align-items:end}
.segmented{display:flex;flex-wrap:wrap;gap:7px}
.segmented label{font-weight:400}

/* Complementos: primero se elige el módulo; recién entonces aparecen sus opciones */
.supplement-zone{margin-top:18px;border-top:1px solid var(--line);padding-top:16px}
.supplement-heading{font-weight:700;margin-bottom:9px}
.supplement-toggles{display:flex;gap:10px;flex-wrap:wrap}
.module-toggle{
  display:flex;align-items:center;gap:8px;padding:9px 13px;border:1px solid #cdd6dc;border-radius:9px;
  background:#f7f9fa;cursor:pointer;font-weight:700;transition:.15s ease
}
.module-toggle.active{border-color:#8fa2ae;background:#eef3f5}
.module-toggle input{margin:0}
.supp-panel{
  display:none;margin-top:12px;padding:14px 15px;border:1px solid #d8e0e5;border-radius:10px;background:#fafbfc
}
.supp-panel.on{display:block}
.supp-title{font-weight:700;margin-bottom:10px}
.supp-types{display:flex;gap:10px 20px;flex-wrap:wrap;margin-bottom:12px}
.supp-types label{font-weight:400}
.compact-controls{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(165px,220px));gap:12px;align-items:end;justify-content:start
}
.compact-controls .control{min-width:0}
.compact-note{margin-top:9px}

/* Vista previa */
.preview-wrap{display:none}
.teacher-summary{
  background:#fff;border:1px solid var(--line);border-left:5px solid var(--ui-accent);
  border-radius:9px;padding:12px 15px;margin:0 0 12px
}
.teacher-summary strong{display:block;margin-bottom:4px}
.summary-line{font-size:.93rem;color:#455a64}
.toolbar{margin-bottom:12px}
.edit-hint{
  display:none;margin:0 0 10px;padding:8px 10px;background:#eef5f7;border-radius:6px;font-size:.88rem;color:#455a64
}
.edit-mode .edit-hint{display:block}
#designPanel{display:none}

.pages-stage{display:flex;flex-direction:column;align-items:center;gap:28px;padding:8px 0 32px}
.page-shell{position:relative}
.page-label{position:absolute;top:-22px;left:2px;font-size:.78rem;color:#73818a;font-weight:700}
.a4-page{
  --sheet-accent:#b71c1c;--sheet-soft:#fbefef;
  width:210mm;height:297mm;background:#fff;padding:14mm 13mm 14mm 13mm;
  box-shadow:0 2px 16px rgba(0,0,0,.14);overflow:hidden
}
.student-heading{display:flex;justify-content:space-between;gap:22px;align-items:flex-end;margin-bottom:17px}
.student-name{flex:1}.student-date{width:185px}
.write-line{display:inline-block;border-bottom:1px solid #444;min-width:65%;height:20px;vertical-align:bottom}
.sheet-title{font-weight:700;font-size:1.12rem;margin:7px 0 15px;color:var(--sheet-accent)}

/* Problemas */
.problem{position:relative;line-height:1.48;font-size:1.02rem;break-inside:avoid;margin:0 0 12px;padding:0}
.problem::before{content:attr(data-number) ".";font-weight:700;margin-right:5px;color:var(--sheet-accent)}
.style-clean .problem{padding:0;margin-bottom:12px}
.style-box .problem,.style-box-space .problem{
  border:1.4px solid #aeb8bf;border-radius:10px;padding:12px 14px 12px 39px;margin-bottom:12px;
  background:linear-gradient(90deg,var(--sheet-soft) 0 7px,#fff 7px 100%)
}
.style-box .problem::before,.style-box-space .problem::before{
  position:absolute;left:14px;top:12px;background:var(--sheet-accent);color:#fff;width:20px;height:20px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-size:.8rem;margin:0
}
.answer-space{display:none}
.style-box-space .answer-space{
  display:block;height:22mm;margin-top:10px;
  background:repeating-linear-gradient(to bottom,transparent 0,transparent 8mm,#d7dde1 8.2mm,transparent 8.4mm)
}
.edit-controls{
  display:none;position:absolute;right:7px;top:7px;gap:5px;background:#fff;padding:4px;border-radius:7px;
  border:1px solid #d7dde1;box-shadow:0 1px 5px rgba(0,0,0,.08)
}
.edit-mode .edit-controls{display:flex}
.edit-controls button{font-size:.74rem;padding:5px 7px}

/* Títulos de los bloques complementarios */
.section-heading{
  font-weight:700;font-size:1.05rem;color:var(--sheet-accent);border-bottom:1px solid #d6dde1;
  padding-bottom:4px;margin:5px 0 10px
}
.print-block{break-inside:avoid}

/* OPERACIONES: inspirado en la fábrica específica */
.ops-sheet-block{
  border:1px solid #9da8ae;
  border-radius:4mm;
  padding:7mm 6mm 6mm;
  margin-bottom:5mm;
  background:#fff;
  width:100%;
  overflow:hidden;
}
.ops-grid{
  display:grid;
  column-gap:5mm;
  row-gap:9mm;
  align-items:start;
  width:100%;
}
.ops-grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.ops-grid.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.ops-grid.cols-5{grid-template-columns:repeat(5,minmax(0,1fr))}
.op-card{
  min-width:0;
  min-height:25mm;
  display:flex;
  align-items:flex-start;
  justify-content:center;
  overflow:hidden;
}
.op-stack{
  width:26mm;
  max-width:100%;
  font-family:"Courier New",Courier,monospace;
  font-weight:700;
  font-size:1.08rem;
  line-height:1.12;
  font-variant-numeric:tabular-nums;
  text-align:right;
}
.op-stack .top,.op-stack .second{display:block;padding:1mm 1mm;white-space:nowrap}
.op-stack .second{border-bottom:1.2px solid #20272b}
.op-stack .result-space{display:block;height:8mm;padding:1mm}
.op-symbol{display:inline-block;width:4.5mm;text-align:left}
.division-algorithm{
  width:34mm;
  height:29mm;
  display:grid;
  grid-template-columns:1fr 13mm;
  grid-template-rows:9mm 1fr;
  font-family:"Courier New",Courier,monospace;
  font-weight:700;
  font-size:1.08rem;
  line-height:1.1;
  font-variant-numeric:tabular-nums;
}
.division-dividend{
  grid-column:1;grid-row:1 / span 2;
  text-align:right;padding:1.5mm 2.3mm 0 0;
}
.division-divisor{
  grid-column:2;grid-row:1;
  border-left:1.35px solid #20272b;
  border-bottom:1.35px solid #20272b;
  text-align:center;padding:1.5mm 1mm 1mm;
  white-space:nowrap;
}
.division-quotient{
  grid-column:2;grid-row:2;
  border-left:1.35px solid #20272b;
  min-height:15mm;
}
.ops-grid.horizontal{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:12mm;row-gap:8mm}
.op-horizontal{
  width:100%;min-height:18mm;
  display:flex;align-items:center;justify-content:center;
  font-family:"Courier New",Courier,monospace;
  font-weight:700;font-size:1.08rem;line-height:1.12;
  font-variant-numeric:tabular-nums;
  white-space:nowrap;
}
.op-horizontal .horizontal-answer{display:inline-block;width:25mm;border-bottom:1.2px solid #333;margin-left:2mm}

/* NUMERACIÓN: actividades visuales tipo ficha */
.num-activity{
  position:relative;
  padding:0 0 1mm 13mm;
  margin-bottom:7mm;
  min-height:20mm;
  width:100%;
  overflow:hidden;
}
.activity-badge{
  position:absolute;left:0;top:0;width:10mm;height:10mm;border-radius:4mm;background:#616161;color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem
}
.activity-instruction{font-weight:700;font-size:1.04rem;margin:0 0 4mm}
.activity-help{font-size:.78rem;color:#59666d;margin:-1.5mm 0 4mm}

/* Ordenamiento */
.number-chips{
  display:grid;
  grid-template-columns:repeat(6,minmax(0,1fr));
  gap:2.7mm;
  margin:1mm 0 4mm;
  width:100%;
}
.number-chip{
  min-width:0;
  padding:3.1mm 1.5mm;
  border:1px solid #9da8ae;
  border-radius:4mm;
  text-align:center;
  font-weight:700;
  background:#fbfcfc;
  white-space:nowrap;
  overflow:hidden;
}
.order-answer{
  display:grid;
  grid-template-columns:repeat(11,minmax(0,auto));
  align-items:center;
  justify-content:center;
  gap:1.6mm;
  width:100%;
}
.order-slot{
  width:20.5mm;
  max-width:100%;
  height:11.5mm;
  border:1px solid #aeb8bf;
  border-radius:3mm;
  background:#fff;
}
.order-sign{font-weight:700;font-size:1.1rem}

/* Recta numérica */
.recta-wrap{margin:0 2mm 0}
.recta-scale{
  display:grid;
  grid-template-columns:repeat(8,minmax(0,1fr));
  position:relative;
  padding-top:10mm;
  width:100%;
}
.recta-scale::before{
  content:"";
  position:absolute;
  left:1.4%;
  right:1.4%;
  top:20.5mm;
  border-top:1.25px solid #455a64;
}
.recta-point{position:relative;text-align:center;min-width:0}
.recta-box{
  width:78%;
  max-width:23mm;
  height:8.5mm;
  margin:0 auto 5.5mm;
  border:1px solid #aeb8bf;
  border-radius:2.6mm;
  background:#fff;
}
.recta-box.empty-ref{border-color:transparent;background:transparent}
.recta-tick{height:9mm;position:relative}
.recta-tick::before{
  content:"";
  position:absolute;
  left:50%;
  top:-1mm;
  height:9mm;
  border-left:1.2px solid #607d8b;
}
.recta-point.major .recta-tick::before{border-left:2px solid #455a64}
.recta-label{
  font-size:.74rem;
  font-weight:700;
  min-height:5mm;
  white-space:nowrap;
  overflow:visible;
}

/* Tabla */
.num-table{
  border-collapse:separate;border-spacing:0;width:100%;font-size:.9rem;border:1px solid #9eaab2;border-radius:3mm;overflow:hidden
}
.num-table th,.num-table td{border-right:1px solid #aeb4b8;border-bottom:1px solid #aeb4b8;padding:2.8mm;text-align:center;height:10mm}
.num-table th:last-child,.num-table td:last-child{border-right:0}
.num-table tr:last-child td{border-bottom:0}
.num-table th{background:#f2f5f7;font-weight:700}
.cell-blank{display:inline-block;width:24mm;height:7mm;border-bottom:1px solid #77858d}

/* Descomposición */
.decomp-card{
  border:1px solid #c6cdd1;border-radius:3mm;padding:4mm 5mm;background:#fbfcfc
}
.decomp-line{display:flex;align-items:center;gap:3mm;font-size:1rem;margin:2mm 0}
.decomp-number{font-weight:700;min-width:24mm}
.decomp-answer{flex:1;border-bottom:1px solid #6e7b82;height:8mm}

/* Colores */
.color-red{--sheet-accent:#b71c1c;--sheet-soft:#fbefef}
.color-blue{--sheet-accent:#1565c0;--sheet-soft:#edf5fd}
.color-green{--sheet-accent:#2e7d32;--sheet-soft:#eef8ef}
.color-violet{--sheet-accent:#6a1b9a;--sheet-soft:#f6eef9}
.color-gray{--sheet-accent:#455a64;--sheet-soft:#f2f4f5}
.color-swatches{display:flex;gap:9px;flex-wrap:wrap;margin-top:7px}
.color-swatches label{
  display:flex;align-items:center;gap:6px;border:1px solid #d5dce1;border-radius:7px;padding:6px 8px;font-weight:400;background:#fff
}
.swatch{width:18px;height:18px;border-radius:50%;display:inline-block;border:1px solid rgba(0,0,0,.18)}
.sw-red{background:#b71c1c}.sw-blue{background:#1565c0}.sw-green{background:#2e7d32}.sw-violet{background:#6a1b9a}.sw-gray{background:#455a64}

.measure-zone{position:absolute;left:-10000px;top:0;width:184mm;visibility:hidden}
.measure-zone .measure-inner{width:184mm}

@media(max-width:900px){
  .grid{grid-template-columns:1fr 1fr}
  .presentation-grid{grid-template-columns:1fr}
  .compact-controls{grid-template-columns:repeat(2,minmax(170px,1fr))}
  .pages-stage{align-items:stretch}
  .a4-page{width:100%;height:auto;min-height:297mm}
}
@media(max-width:620px){
  .grid,.compact-controls{grid-template-columns:1fr}
  .student-heading{display:block}.student-date{width:auto;margin-top:12px}
  .ops-grid.cols-3,.ops-grid.cols-4,.ops-grid.cols-5{grid-template-columns:repeat(2,1fr)}
}
@media print{
  .ops-grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))!important}
  .ops-grid.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))!important}
  .ops-grid.cols-5{grid-template-columns:repeat(5,minmax(0,1fr))!important}
}
@media print{
  body{background:#fff}
  .app>h1,.lead,#configPanel,.teacher-summary,.toolbar,.status,.edit-hint,#designPanel,.page-label,.edit-controls,.num-edit-controls{display:none!important}
  .app{max-width:none;padding:0}
  .preview-wrap{display:block!important}
  .pages-stage{display:block;padding:0}
  .page-shell{page-break-after:always;break-after:page}
  .page-shell:last-child{page-break-after:auto;break-after:auto}
  .a4-page{width:210mm;height:297mm;box-shadow:none;margin:0;padding:14mm 13mm 14mm 13mm;overflow:hidden}
  @page{size:A4;margin:0}
}

.pagination-test-pair,.pagination-holder{display:contents}

.decomp-example{
  margin:-1mm 0 3.5mm;
  padding:2.5mm 3.5mm;
  border-radius:2.5mm;
  background:#f4f6f7;
  font-size:.9rem;
}
.decomp-multi .decomp-line{
  margin:3mm 0;
}
.anterior-table td,.anterior-table th{
  width:33.333%;
}

/* Edición de actividades de numeración */
.num-edit-controls{
  display:none;position:absolute;right:0;top:-1mm;z-index:4;
  gap:4px;background:#fff;padding:4px;border-radius:7px;
  border:1px solid #d7dde1;box-shadow:0 1px 5px rgba(0,0,0,.08)
}
.edit-mode .num-edit-controls{display:flex}
.num-edit-controls button{font-size:.72rem;padding:5px 7px}
.decomp-mode-label{font-weight:700;min-width:32mm;color:#455a64;font-size:.88rem}
.decomp-line.multiplicative .decomp-number{min-width:24mm}
@media print{.num-edit-controls{display:none!important}.ops-grid.horizontal{grid-template-columns:repeat(2,minmax(0,1fr))!important}}


/* Identidad visual de escolar.com.ar */
.site-header{background-color:#2c3e50;padding:10px 0;width:100%;box-sizing:border-box;position:sticky;top:0;z-index:1000;box-shadow:0 4px 10px rgba(0,0,0,.3);font-family:Roboto,Arial,sans-serif}
.site-nav{max-width:1100px;margin:0 auto;padding:0 20px;display:flex;justify-content:space-between;align-items:center;gap:18px}
.site-logo{display:flex;align-items:center;text-decoration:none;flex:none}
.site-logo img{height:60px;width:auto;display:block;transition:transform .2s ease}
.site-logo:hover img{transform:scale(1.03)}
.site-links{display:flex;gap:20px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.site-links a{color:#fff;text-decoration:none;font-size:.9rem;font-weight:400}
.site-links a:hover,.site-links a:focus-visible{text-decoration:underline;text-underline-offset:4px}
.site-links .site-back{color:#f1c40f;font-weight:700;border-left:1px solid #7f8c8d;padding-left:20px;white-space:nowrap}
.site-links .site-back:hover,.site-links .site-back:focus-visible{color:#ffe36b}
#contenedor-pie{position:relative;z-index:1}
.site-footer-fallback{max-width:1100px;margin:28px auto 0;padding:22px 20px 28px;border-top:1px solid #d5dce1;color:#54636b;text-align:center;font-size:.88rem;line-height:1.5}

/* Pie de licencia de cada hoja generada */
.a4-page{position:relative;padding-bottom:24mm!important}
.sheet-footer{position:absolute;left:13mm;right:13mm;bottom:7mm;min-height:8mm;border-top:1px solid #d6dde1;padding-top:2.2mm;display:grid;grid-template-columns:1fr auto auto;gap:5mm;align-items:center;font-size:7.8pt;line-height:1.15;color:#59666d}
.sheet-footer .footer-brand{white-space:nowrap}
.sheet-footer .footer-license{display:flex;align-items:center;gap:2mm;white-space:nowrap}
.sheet-footer .cc-logo{height:7mm;width:auto;display:block}
.sheet-footer .footer-page{white-space:nowrap;text-align:right}
@media(max-width:640px){.site-nav{padding:0 14px;gap:10px}.site-logo img{height:48px}.site-links{gap:12px}.site-links a{font-size:.82rem}}
@media(max-width:460px){.site-nav{align-items:flex-start;flex-direction:column}.site-links{width:100%;justify-content:flex-start;gap:10px 14px;padding-bottom:3px}.site-links .site-back{border-left:0;padding-left:0;width:100%;padding-top:4px}}
@media print{.site-header,#contenedor-pie{display:none!important}.a4-page{padding:14mm 13mm 24mm 13mm!important}.sheet-footer{display:grid!important}}