.flat-puzzle-hub {
  padding: 26px 0 82px;
  border-bottom: 1px solid var(--line);
  background: #f5f6f2;
}

.flat-hub-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, .8fr);
  gap: 56px;
  align-items: end;
  padding: 48px 0 38px;
}

.flat-hub-heading h1 {
  max-width: 860px;
  margin-top: 8px;
  font-size: 3.25rem;
  line-height: 1.08;
}

.flat-hub-heading > p {
  color: var(--muted);
  font-size: .84rem;
  line-height: 1.72;
}

.flat-series-alert {
  display: grid;
  grid-template-columns: minmax(260px, .58fr) minmax(0, 1.42fr);
  gap: 28px;
  align-items: center;
  margin-bottom: 52px;
  padding: 24px 28px;
  border-left: 5px solid var(--orange);
  background: var(--ink);
  color: #fff;
}

.flat-series-alert > div:first-child {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.flat-series-alert > div:first-child strong {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: 1px solid rgba(255, 255, 255, .22);
  color: var(--yellow);
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 560;
}

.flat-series-alert > div:first-child strong:last-child {
  border-right: 0;
}

.flat-series-alert h2 {
  font-size: 1.28rem;
}

.flat-series-alert p {
  margin-top: 7px;
  color: rgba(255, 255, 255, .72);
  font-size: .75rem;
  line-height: 1.6;
}

.flat-filter-index {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: #fff;
}

.flat-filter-index a {
  min-width: 0;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px 14px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-size: .7rem;
  font-weight: 800;
  text-align: center;
}

.flat-filter-index a:hover,
.flat-filter-index a:focus-visible {
  border-bottom-color: var(--orange);
  color: var(--orange-dark);
}

.flat-filter-current,
.flat-filter-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
  gap: 48px;
  align-items: end;
}

.flat-filter-current {
  margin-top: 32px;
  padding: 30px;
  border-left: 5px solid var(--orange);
  background: #fff;
  scroll-margin-top: 96px;
}

.flat-filter-current h2,
.flat-filter-heading h2 {
  margin-top: 7px;
  font-size: 1.55rem;
}

.flat-filter-current p:not(.eyebrow),
.flat-filter-heading > p {
  margin-top: 10px;
  color: var(--muted);
  font-size: .75rem;
  line-height: 1.65;
}

.flat-filter-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.flat-filter-options span {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid var(--line-strong);
  background: #f5f6f2;
  font-size: .66rem;
  font-weight: 760;
}

.flat-filter-section,
.flat-piece-directory {
  margin-top: 64px;
  scroll-margin-top: 96px;
}

.flat-filter-heading {
  margin-bottom: 24px;
}

.flat-route-grid-single {
  grid-template-columns: minmax(0, 1fr);
}

.flat-route-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.flat-route-card {
  min-width: 0;
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.flat-route-card figure {
  min-height: 230px;
  overflow: hidden;
  background: #eceee9;
}

.flat-route-card figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.flat-route-card > div {
  min-width: 0;
  padding: 24px;
}

.flat-route-card > div > span,
.piece-brief-grid article > span {
  color: var(--orange-dark);
  font-size: .64rem;
  font-weight: 850;
}

.flat-route-card h3 {
  margin-top: 7px;
  font-size: 1.35rem;
}

.flat-route-card p {
  margin-top: 9px;
  color: var(--muted);
  font-size: .72rem;
  line-height: 1.62;
}

.flat-route-counts {
  display: flex;
  flex-wrap: wrap;
  gap: 0 16px;
  margin-top: 18px;
}

.flat-route-counts a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border-bottom: 1px solid var(--line-strong);
}
.flat-route-counts-summary { display: block; margin-top: 10px; color: var(--muted); font-size: .8rem; }
.flat-route-card h3 a { color: inherit; text-decoration: none; }
.flat-route-card h3 a:hover { text-decoration: underline; text-underline-offset: 3px; }

.flat-route-counts a:hover,
.flat-piece-grid a:hover {
  border-color: var(--orange);
  color: var(--orange-dark);
}

.flat-route-counts strong {
  font-size: .78rem;
}

.flat-route-counts span {
  color: var(--muted);
  font-size: .59rem;
}

.flat-route-action {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  margin-top: 18px;
  border-bottom: 1px solid var(--ink);
  font-size: .7rem;
  font-weight: 850;
}

.flat-piece-group {
  border: 1px solid var(--line);
  background: #fff;
}

.flat-piece-group + .flat-piece-group {
  margin-top: 12px;
}

.flat-piece-group > summary {
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  touch-action: manipulation;
}

.flat-piece-group > summary::-webkit-details-marker {
  display: none;
}

.flat-piece-group > summary strong {
  min-width: 0;
  font-size: .76rem;
  line-height: 1.5;
}

.flat-piece-group > summary span {
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  color: var(--orange-dark);
  font-size: 1.15rem;
  line-height: 1;
  transition: transform 180ms ease, background-color 180ms ease, color 180ms ease;
}

.flat-piece-group > summary:hover,
.flat-piece-group > summary:focus-visible {
  background: var(--soft-orange);
}

.flat-piece-group > summary:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: -3px;
}

.flat-piece-group[open] > summary span {
  transform: rotate(45deg);
  background: var(--ink);
  color: #fff;
}

.flat-piece-group .flat-piece-grid {
  border-top: 1px solid var(--line);
  border-left: 0;
}

.flat-piece-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: #fff;
}

.flat-piece-grid a {
  min-width: 0;
  min-height: 78px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 13px 15px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.flat-piece-option { width: 100%; display: grid; gap: 2px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 4px; background: #fff; color: inherit; text-align: left; }
.flat-piece-option:hover, .flat-piece-option[aria-pressed="true"] { border-color: var(--green); background: var(--green-soft); }
.flat-piece-option strong, .flat-piece-option span { display: block; }
.flat-piece-option span { color: var(--muted); font-size: .75rem; }
.flat-size-selector { display: grid; grid-template-columns: minmax(160px, .35fr) minmax(220px, .65fr); gap: 8px 12px; align-items: center; margin: 18px 0 14px; padding: 14px; border: 1px solid var(--line-strong); background: var(--surface-soft); }
.flat-size-selector label { color: var(--muted); font-size: .78rem; font-weight: 700; }
.flat-size-selector select { min-height: 44px; padding: 7px 10px; border: 1px solid var(--line-strong); border-radius: 4px; background: #fff; color: var(--ink); }
.flat-size-selector-note { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: .78rem; }
.flat-size-record-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.flat-size-record { min-width: 0; padding: 14px; border: 1px solid var(--line); border-radius: 4px; background: #fff; }
.flat-size-record[hidden] { display: none; }
.flat-size-record header { display: flex; justify-content: space-between; gap: 8px; align-items: baseline; }
.flat-size-record header span { color: var(--muted); font: 700 11px/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
.flat-size-record p { margin: 9px 0 5px; font-weight: 700; }
.flat-size-record small { display: block; min-height: 34px; color: var(--muted); font-size: .76rem; }
.flat-size-record .button { margin-top: 10px; min-height: 42px; }
.flat-audience-hero { padding: 54px 0 42px; border-bottom: 1px solid var(--line); background: var(--surface-soft); }
.flat-audience-hero h1 { max-width: 760px; margin: 10px 0; }
.flat-audience-hero p:not(.eyebrow) { max-width: 720px; color: var(--muted); }

.flat-piece-grid strong {
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 620;
}

.flat-piece-grid span {
  margin-top: 3px;
  overflow-wrap: anywhere;
  color: var(--muted);
  font-size: .58rem;
  line-height: 1.35;
}

.product-summary-refined h2 {
  max-width: 620px;
  font-size: 3.15rem;
  line-height: 1.08;
}

.piece-detail-hero {
  padding: 28px 0 72px;
  background: #f5f6f2;
}

.piece-detail-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(440px, 1.1fr);
  gap: 58px;
  align-items: center;
  padding-top: 38px;
}

.piece-detail-hero h1 {
  max-width: 720px;
  margin-top: 9px;
  font-size: 3.45rem;
  line-height: 1.04;
}

.piece-detail-hero p:not(.eyebrow) {
  max-width: 720px;
  margin-top: 18px;
  color: var(--muted);
  font-size: .86rem;
  line-height: 1.7;
}

.piece-detail-hero figure {
  position: relative;
  min-height: 0;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
}

.piece-detail-hero figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.piece-detail-hero figcaption {
  position: absolute;
  right: 14px;
  bottom: 14px;
  left: 14px;
  padding: 10px 12px;
  background: rgba(23, 32, 27, .9);
  color: #fff;
  font-size: .61rem;
  line-height: 1.48;
}

.piece-size-section {
  background: #fff;
}

.piece-size-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.piece-size-record {
  min-width: 0;
  padding: 24px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.piece-size-record header {
  min-height: 68px;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 13px;
  align-items: start;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.piece-size-record header span {
  color: var(--orange-dark);
  font-size: .64rem;
  font-weight: 850;
}

.piece-size-record header strong {
  overflow-wrap: anywhere;
  font-size: 1rem;
  line-height: 1.48;
}

.piece-size-record dl > div {
  display: grid;
  grid-template-columns: minmax(120px, .72fr) minmax(0, 1.28fr);
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.piece-size-record dt,
.piece-size-record dd {
  min-width: 0;
  font-size: .68rem;
  line-height: 1.52;
}

.piece-size-record dt {
  color: var(--muted);
}

.piece-size-record .button {
  width: 100%;
  margin-top: 18px;
}

.piece-boundary {
  margin-top: 22px;
  padding: 15px 18px;
  border-left: 4px solid var(--orange);
  background: var(--soft-orange);
  color: #714536;
  font-size: .69rem;
  line-height: 1.62;
}

.piece-brief-section {
  background: #f5f6f2;
}

.piece-brief-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.piece-brief-grid article {
  min-width: 0;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  padding: 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.piece-brief-grid h3 {
  margin-top: 18px;
  font-size: 1.12rem;
}

.piece-brief-grid p {
  margin-top: 10px;
  color: var(--muted);
  font-size: .7rem;
  line-height: 1.6;
}

.piece-brief-grid em {
  width: fit-content;
  margin-top: auto;
  padding-top: 18px;
  color: var(--orange-dark);
  font-size: .62rem;
  font-style: normal;
  font-weight: 850;
}

.piece-detail-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 30px;
}

[dir="rtl"] .flat-series-alert,
[dir="rtl"] .piece-boundary {
  border-right: 5px solid var(--orange);
  border-left: 0;
}

@media (max-width: 1080px) {
  .flat-hub-heading,
  .piece-detail-hero-grid,
  .flat-filter-current,
  .flat-filter-heading {
    grid-template-columns: 1fr;
  }

  .flat-filter-options {
    justify-content: flex-start;
  }

  .flat-route-card {
    grid-template-columns: 145px minmax(0, 1fr);
  }

  .flat-piece-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .piece-brief-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .product-summary-refined h2 {
    font-size: 2.7rem;
  }
}

@media (max-width: 760px) {
  .flat-puzzle-hub,
  .piece-detail-hero {
    padding-top: 18px;
  }

  .flat-hub-heading {
    gap: 20px;
    padding: 34px 0 28px;
  }

  .flat-hub-heading h1,
  .piece-detail-hero h1 {
    font-size: 2.3rem;
  }

  .flat-series-alert,
  .flat-route-grid,
  .piece-size-grid,
  .flat-size-record-grid {
    grid-template-columns: 1fr;
  }

  .flat-filter-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .flat-filter-current {
    gap: 22px;
    padding: 22px;
  }

  .flat-series-alert {
    gap: 18px;
    padding: 22px;
  }

  .flat-route-card {
    grid-template-columns: 120px minmax(0, 1fr);
  }

  .flat-route-card figure {
    min-height: 250px;
  }

  .flat-route-card > div {
    padding: 18px;
  }

  .flat-piece-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .piece-detail-hero-grid {
    gap: 28px;
    padding-top: 26px;
  }

  .piece-size-record dl > div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .piece-detail-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .piece-detail-actions .button {
    width: 100%;
  }

  .product-summary-refined h2 {
    font-size: 2.35rem;
  }
}

@media (max-width: 480px) {
  .flat-piece-group > summary {
    min-height: 64px;
    gap: 12px;
    padding: 12px 14px;
  }

  .flat-piece-group > summary strong {
    font-size: .7rem;
  }

  .flat-route-card {
    grid-template-columns: 1fr;
  }

  .flat-route-card figure {
    min-height: 0;
    aspect-ratio: 16 / 9;
  }

  .flat-piece-grid,
  .piece-brief-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .flat-filter-index {
    grid-template-columns: 1fr;
  }

  .piece-brief-grid article {
    min-height: 250px;
  }

  .piece-detail-hero h1,
  .flat-hub-heading h1 {
    font-size: 2rem;
  }
  .flat-size-selector { grid-template-columns: 1fr; }
  .flat-size-selector-note { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  .flat-piece-group > summary span {
    transition: none;
  }
}