.ff-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 48px;
  align-items: center;
}

/* Prevent the page-hero and first content section from stacking large paddings. */
.ff-page-hero { padding-bottom: 20px; }
.ff-page-hero + .ff-section { padding-top: 26px; }

.ff-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.ff-text-link {
  color: var(--ink);
  font-weight: 900;
}

.ff-quick {
  background: #fff;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow);
  padding: 24px;
}

.ff-quick strong {
  display: block;
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.ff-quick a {
  display: block;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  color: var(--ink);
  font-weight: 850;
  text-decoration: none;
}

.ff-formula-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.ff-formula-list a {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 2px 14px;
  background: #fff;
  border: 2px solid var(--ink);
  padding: 18px;
  color: var(--ink);
  text-decoration: none;
}

.ff-formula-list span {
  grid-row: 1 / 3;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: var(--ink);
  color: #fff;
  font-weight: 950;
}

.ff-formula-list strong { font-size: 1.05rem; }
.ff-formula-list code { color: var(--muted); white-space: normal; }

.ff-formula-box {
  margin: 26px 0;
  padding: 24px;
  background: var(--ink);
  color: #fff;
  border: 3px solid var(--ink);
  box-shadow: 7px 7px 0 var(--gold);
}

.ff-formula-box span {
  display: block;
  color: #d6e0ea;
  font-size: .82rem;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.ff-formula-box code {
  display: block;
  margin-top: 10px;
  color: #fff;
  font-size: clamp(1.05rem, 2.2vw, 1.45rem);
  white-space: normal;
}

.ff-definition-grid,
.ff-related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.ff-definition-grid > div,
.ff-related-grid > a {
  padding: 18px;
  background: #fff;
  border: 2px solid var(--ink);
}

.ff-definition-grid dt { font-weight: 950; }
.ff-definition-grid dd { margin: 6px 0 0; color: var(--muted); }
.ff-related-grid > a { color: var(--ink); font-weight: 900; text-decoration: none; }

.ff-layout--single { grid-template-columns: minmax(0, 1fr); }
.ff-layout--model {
  grid-template-columns: minmax(0, 1fr) 290px;
  align-items: start;
}
.ff-layout--model > .ff-prose { min-width: 0; }

.ff-toc {
  margin: 24px 0 34px;
  padding: 22px;
  background: var(--blue);
  border: 2px solid var(--ink);
}

.ff-toc strong {
  display: block;
  margin-bottom: 14px;
  font-size: 1.05rem;
}

.ff-toc-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.ff-toc a {
  color: var(--ink);
  font-weight: 850;
  text-underline-offset: 3px;
}

.ff-related-grid { gap: 22px; margin-top: 20px; }
.ff-related-grid > a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 86px;
  padding: 20px 22px;
  box-shadow: 4px 4px 0 var(--ink);
}
.ff-related-grid > a::after {
  content: "→";
  flex: 0 0 auto;
  font-size: 1.35rem;
}

.ff-steps {
  counter-reset: ff-step;
  display: grid;
  gap: 14px;
  padding: 0;
  list-style: none;
}

.ff-steps li {
  counter-increment: ff-step;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 18px;
  background: #fff;
  border: 2px solid var(--ink);
}

.ff-steps li::before {
  content: counter(ff-step);
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--gold);
  border: 2px solid var(--ink);
  font-weight: 950;
}

.ff-faq { display: grid; gap: 18px; margin-top: 20px; }
.ff-faq details { background: #fff; border: 2px solid var(--ink); overflow: hidden; }
.ff-faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 22px;
  cursor: pointer;
  font-weight: 950;
  list-style: none;
}
.ff-faq summary::-webkit-details-marker { display: none; }
.ff-faq summary::after {
  content: "+";
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  background: var(--gold);
  border: 2px solid var(--ink);
  font-size: 1.25rem;
  line-height: 1;
}
.ff-faq details[open] summary::after { content: "−"; }
.ff-faq details p {
  max-width: none;
  margin: 0;
  padding: 18px 22px 22px;
  border-top: 1px solid var(--line);
}

.ff-comparison {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin: 22px 0 34px;
}

.ff-comparison article {
  padding: 24px;
  background: #fff;
  border: 2px solid var(--ink);
  box-shadow: 5px 5px 0 var(--gold);
}

.ff-comparison h3 { margin-top: 0; }

.ff-model-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 26px 0;
}

.ff-model-summary > div {
  min-height: 104px;
  padding: 18px;
  background: #fff;
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 var(--gold);
}

.ff-model-summary span,
.ff-model-output-head span {
  display: block;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.ff-model-summary strong { display: block; margin-top: 7px; line-height: 1.25; }
.ff-fields--model { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.ff-fields--model input { background: var(--blue); }
.ff-field small { display: block; margin-top: 5px; color: var(--muted); }

.ff-model-output {
  margin: 28px 0 38px;
  background: #fff;
  border: 3px solid var(--ink);
  box-shadow: var(--shadow);
}

.ff-model-output-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 22px;
  background: var(--mint);
  border-bottom: 2px solid var(--ink);
}

.ff-table-wrap { overflow-x: auto; }
.ff-model-output .ff-table { min-width: 860px; }
.ff-model-output .ff-table th:not(:first-child),
.ff-model-output .ff-table td { text-align: right; white-space: nowrap; }
.ff-model-output .ff-table tbody th { background: #fff; color: var(--ink); min-width: 220px; }

#workbook-preview,
#workbook { scroll-margin-top: 108px; }

.ff-workbook-preview {
  margin: 48px 0 30px;
  padding: clamp(22px, 4vw, 38px);
  background: var(--paper);
  border: 3px solid var(--ink);
  box-shadow: 7px 7px 0 var(--ink);
}

.ff-workbook-preview-head {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(210px, .4fr);
  gap: 28px;
  align-items: start;
}

.ff-workbook-preview-head h2 { margin: 6px 0 10px; }
.ff-workbook-preview-head p { margin-bottom: 0; }

.ff-workbook-version {
  display: grid;
  gap: 5px;
  padding: 18px;
  background: var(--mint);
  border: 2px solid var(--ink);
}

.ff-workbook-version span,
.ff-workbook-proof span {
  color: var(--muted);
  font-size: .75rem;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.ff-workbook-version small { color: var(--muted); font-weight: 750; }

.ff-workbook-tabs {
  display: flex;
  gap: 8px;
  margin: 26px 0 18px;
  padding-bottom: 4px;
  overflow-x: auto;
}

.ff-workbook-tabs span {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 9px 14px;
  background: #fff;
  border: 2px solid var(--ink);
  font-size: .84rem;
  font-weight: 850;
  white-space: nowrap;
}

.ff-workbook-tabs .is-active { background: var(--ink); color: #fff; }

.ff-workbook-proof {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 2px solid var(--ink);
  background: #fff;
}

.ff-workbook-proof > div { padding: 18px; }
.ff-workbook-proof > div + div { border-left: 2px solid var(--ink); }
.ff-workbook-proof strong { display: block; margin-top: 5px; }
.ff-workbook-proof p { margin: 6px 0 0; font-size: .88rem; line-height: 1.45; }

.ff-workbook-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.ff-workbook-figure {
  margin: 0;
  overflow: hidden;
  background: #fff;
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 var(--gold);
}

.ff-workbook-figure--primary { grid-column: 1 / -1; }

.ff-workbook-figure-head {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 14px 16px;
  background: var(--ink);
  color: #fff;
}

.ff-workbook-figure-head span {
  color: var(--gold);
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.ff-workbook-figure > a {
  display: block;
  max-height: 660px;
  overflow: hidden;
  background: #fff;
}

.ff-workbook-figure:not(.ff-workbook-figure--primary) > a { max-height: 340px; }

.ff-workbook-figure > a:focus-visible {
  outline: 4px solid var(--gold);
  outline-offset: -4px;
}

.ff-workbook-figure img { display: block; width: 100%; height: auto; }
.ff-workbook-look { margin: 0; padding: 14px 16px 6px; font-size: .9rem; }
.ff-workbook-figure figcaption { padding: 0 16px 16px; color: var(--muted); font-size: .8rem; line-height: 1.5; }

.ff-workbook-includes {
  margin-top: 24px;
  padding: 20px 22px;
  background: var(--blue);
  border: 2px solid var(--ink);
}

.ff-workbook-includes h3 { margin: 0 0 10px; }
.ff-workbook-includes ul { columns: 2; margin-bottom: 0; }

.ff-model-product-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  margin: 24px 0 42px;
}

.ff-model-product-card {
  overflow: hidden;
  background: #fff;
  border: 3px solid var(--ink);
  box-shadow: 7px 7px 0 var(--gold);
}

.ff-model-product-image {
  position: relative;
  display: block;
  height: 300px;
  overflow: hidden;
  background: var(--paper);
  border-bottom: 3px solid var(--ink);
}

.ff-model-product-image img {
  display: block;
  width: 100%;
  height: auto;
}

.ff-model-product-image span {
  position: absolute;
  right: 14px;
  bottom: 14px;
  padding: 9px 12px;
  background: var(--ink);
  color: #fff;
  font-size: .82rem;
  font-weight: 900;
  box-shadow: 3px 3px 0 var(--gold);
}

.ff-model-product-image:focus-visible { outline: 4px solid var(--gold); outline-offset: -4px; }
.ff-model-product-body { padding: 22px; }

.ff-model-product-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.ff-file-badge {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border: 2px solid var(--ink);
  font-size: .78rem;
}

.ff-file-badge--excel { background: var(--mint); color: #146c43; }
.ff-file-badge--sheets { background: var(--blue); color: #188038; }
.ff-file-badge b { color: var(--ink); }
.ff-model-product-meta { margin: 14px 0 4px; color: var(--muted); font-size: .82rem; font-weight: 850; }
.ff-model-product-body h3 { margin: 8px 0 10px; }
.ff-model-product-body ul { margin: 0 0 20px; padding-left: 20px; }

.ff-model-product-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.ff-download-link {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 2px solid var(--ink);
  color: var(--ink);
  font-weight: 900;
  text-decoration: none;
}

.ff-download-link:hover,
.ff-download-link:focus-visible { background: var(--gold); }

.ff-download {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px 28px;
  align-items: center;
  margin: 44px 0;
  padding: 28px;
  background: var(--blue);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow);
}

.ff-download h2 { margin-top: 6px; }
.ff-download .ff-fine { grid-column: 1 / -1; margin: 0; }

.ff-workbook-rail {
  position: sticky;
  top: 92px;
}

.ff-workbook-rail-card {
  overflow: hidden;
  padding: 18px;
  background: var(--blue);
  border: 3px solid var(--ink);
  box-shadow: 7px 7px 0 var(--gold);
}

.ff-workbook-rail-card img {
  display: block;
  width: 100%;
  height: 150px;
  margin-bottom: 18px;
  object-fit: cover;
  object-position: top;
  background: #fff;
  border: 2px solid var(--ink);
}

.ff-workbook-rail-card h2 { margin: 5px 0 10px; font-size: 1.45rem; }
.ff-workbook-rail-card p { font-size: .92rem; line-height: 1.55; }
.ff-workbook-rail-card .ff-button { width: 100%; }
.ff-workbook-rail-card small { display: block; margin-top: 12px; color: var(--muted); line-height: 1.45; }
.ff-workbook-mobile-bar { display: none; }

.ff-workbook-dialog {
  width: min(760px, calc(100% - 32px));
  max-height: calc(100dvh - 32px);
  margin: auto;
  padding: 0;
  color: var(--ink);
  background: transparent;
  border: 0;
}

.ff-workbook-dialog::backdrop { background: rgba(8, 31, 58, .76); }
.ff-workbook-dialog.is-open {
  position: fixed;
  z-index: 50;
  inset: 0;
  display: grid;
  place-items: center;
  width: 100%;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: 16px;
  background: rgba(8, 31, 58, .76);
}
.ff-workbook-dialog-panel {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  gap: 28px;
  overflow: auto;
  max-height: calc(100dvh - 32px);
  padding: 34px;
  background: var(--paper);
  border: 3px solid var(--ink);
  box-shadow: 9px 9px 0 var(--gold);
}

.ff-workbook-dialog form { padding: 22px; background: #fff; border: 2px solid var(--ink); }
.ff-workbook-dialog-proof ul { padding-left: 20px; }
.ff-dialog-close {
  position: absolute;
  z-index: 2;
  top: 8px;
  right: 8px;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  color: #fff;
  background: var(--ink);
  border: 2px solid var(--ink);
  font: 900 1.6rem/1 sans-serif;
  cursor: pointer;
}
.ff-dialog-close:hover,
.ff-dialog-close:focus-visible { color: var(--ink); background: var(--gold); outline: 3px solid #fff; }
.ff-consent { position: relative; display: block; min-height: 24px; margin: 18px 0; padding-left: 31px; font-size: .93rem; }
.ff-consent input { position: absolute; top: 2px; left: 0; width: 20px; height: 20px; margin: 0; }
.ff-form-status { min-height: 1.6em; margin-bottom: 0; font-weight: 850; }
.ff-honeypot { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

@media (max-width: 680px) {
  .ff-definition-grid,
  .ff-related-grid,
  .ff-comparison,
  .ff-model-summary,
  .ff-download,
  .ff-workbook-preview-head,
  .ff-workbook-proof,
  .ff-workbook-gallery,
  .ff-model-product-grid { grid-template-columns: 1fr; }

  .ff-workbook-proof > div + div { border-left: 0; border-top: 2px solid var(--ink); }
  .ff-workbook-figure--primary { grid-column: auto; }
  .ff-workbook-figure > a,
  .ff-workbook-figure:not(.ff-workbook-figure--primary) > a { max-height: 430px; }
  .ff-workbook-includes ul { columns: 1; }
  .ff-model-product-image { height: 250px; }
}

@media (max-width: 820px) {
  .ff-links > a { display: none; }
  .ff-hero-grid, .ff-formula-list { grid-template-columns: 1fr; }
  .ff-fields--model { grid-template-columns: 1fr; }
  .ff-layout--model { grid-template-columns: minmax(0, 1fr); }
  .ff-workbook-rail { display: none; }
  .ff-workbook-mobile-bar {
    position: fixed;
    z-index: 20;
    right: 0;
    bottom: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    min-height: 68px;
    padding: 10px max(16px, env(safe-area-inset-right)) calc(10px + env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
    background: var(--ink);
    color: #fff;
    border-top: 3px solid var(--gold);
  }
  .ff-workbook-mobile-bar div { display: grid; }
  .ff-workbook-mobile-bar span { color: #d6e0ea; font-size: .75rem; }
  .ff-workbook-mobile-bar .ff-button { min-height: 46px; padding: 9px 14px; }
  body:has(.ff-workbook-mobile-bar) { padding-bottom: calc(68px + env(safe-area-inset-bottom)); }
  .ff-workbook-dialog { width: 100%; max-height: calc(100dvh - 24px); margin: auto 0 0; }
  .ff-workbook-dialog.is-open { place-items: end center; max-height: none; padding: 24px 0 0; }
  .ff-workbook-dialog-panel {
    grid-template-columns: 1fr;
    gap: 12px;
    max-height: calc(100dvh - 24px);
    padding: 28px 18px calc(18px + env(safe-area-inset-bottom));
    border-radius: 18px 18px 0 0;
    box-shadow: none;
  }
  .ff-workbook-dialog-proof ul { display: none; }
}