/* Only the requested four-part textbook feature section on the product page. */
.product-page .features-v13 .section-head{max-width:860px;margin-bottom:35px}
.product-page .features-v13 .feature-intro{margin-top:19px;color:var(--muted);font-size:15px;line-height:1.95;letter-spacing:0}
.product-page .features-v13 .feature-grid{display:grid;grid-template-columns:1fr;gap:46px}
.product-page .features-v13 .feature-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);column-gap:68px}
.product-page .features-v13 .feature-card{display:flex;flex-direction:column;min-width:0;border-top:1px solid #c8d1da;padding-top:23px}
.product-page .features-v13 .feature-card-label{min-width:0}
.product-page .features-v13 h3{font-size:24px;line-height:1.65;margin-top:18px;margin-bottom:17px}
.product-page .features-v13 .feature-kind{margin-top:11px;color:var(--blue);font-size:13px;font-weight:700;line-height:1.7}
.product-page .features-v13 .feature-description{font-size:15px;line-height:1.95;color:var(--muted)}
.product-page .features-v13 .feature-use{margin-top:18px;color:var(--ink);font-size:14px;line-height:1.9}
.product-page .features-v13 .feature-preview{margin-top:23px;width:100%;min-width:0;align-self:start}
.product-page .features-v13 .feature-preview img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:5px;background:#fff;object-fit:contain}
.product-page .features-v13 .feature-preview figcaption{margin-top:8px;font-size:11px;line-height:1.7;color:var(--muted)}
.product-page .features-v13 .feature-actions{margin-top:22px;width:100%;align-self:start;min-width:0}
.product-page .features-v13 .feature-actions .btn{max-width:100%;gap:16px}
.product-page .features-v13 .feature-actions .btn>span{flex-shrink:0}
.product-page .features-v13 .feature-pdf-note{margin-top:9px;color:var(--muted);font-size:11px;line-height:1.8}
.product-page .features-v13 .feature-grammar{margin-top:38px;padding-top:22px;border-top:1px solid #c8d1da}
.product-page .features-v13 .feature-grammar h3{margin:0 0 9px;font-size:19px;line-height:1.6}
.product-page .features-v13 .feature-grammar p{font-size:15px;color:var(--muted);line-height:1.95}
@supports(grid-template-rows:subgrid){
  .product-page .features-v13 .feature-row--basics{grid-template-rows:auto auto 1fr}
  .product-page .features-v13 .feature-row--practice{grid-template-rows:auto auto auto auto 1fr auto}
  .product-page .features-v13 .feature-card{display:grid;grid-template-rows:subgrid;grid-row:span 3}
  .product-page .features-v13 .feature-card--practice{grid-row:span 6}
}
@media(max-width:1100px) and (min-width:761px){
  .product-page .features-v13 .feature-row{column-gap:42px}
  .product-page .features-v13 .feature-heading-break{display:none}
}
@media(max-width:760px){
  .product-page .features-v13 .section-head{margin-bottom:25px}
  .product-page .features-v13 .feature-heading-break{display:none}
  .product-page .features-v13 .feature-intro{font-size:14px;margin-top:16px}
  .product-page .features-v13 .feature-grid{gap:29px}
  .product-page .features-v13 .feature-row{grid-template-columns:minmax(0,1fr);grid-template-rows:none;row-gap:29px}
  .product-page .features-v13 .feature-card,.product-page .features-v13 .feature-card--practice{display:flex;grid-row:auto;grid-template-rows:none;padding-top:20px}
  .product-page .features-v13 h3{font-size:21px;margin-top:13px;margin-bottom:12px}
  .product-page .features-v13 .feature-kind{font-size:13px;margin-top:9px}
  .product-page .features-v13 .feature-description{font-size:14px}
  .product-page .features-v13 .feature-use{font-size:14px;margin-top:16px}
  .product-page .features-v13 .feature-preview{margin-top:20px;width:100%}
  .product-page .features-v13 .feature-actions{margin-top:20px;width:100%}
  .product-page .features-v13 .feature-actions .btn{width:100%;white-space:normal}
  .product-page .features-v13 .feature-grammar{margin-top:29px;padding-top:20px}
  .product-page .features-v13 .feature-grammar h3{font-size:18px}
  .product-page .features-v13 .feature-grammar p{font-size:14px}
}