.concepts-section { padding-block: clamp(2rem, 5vw, 4.5rem); border-top: 1px solid var(--rule); }
.concepts-section .section-head { align-items: end; margin-block-end: 1.6rem; }
.concepts-section .section-head h2 { margin-top: .3rem; }
.concept-collection + .concept-collection { margin-top: clamp(1.8rem, 4vw, 3rem); }
.concept-collection-header { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: .45rem 1rem; margin-bottom: .7rem; }
.concept-collection-header h3 { font: 400 clamp(1.8rem, 3vw, 2.65rem)/1 var(--display); }
.concept-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .8rem; }
.concept-card { display: block; min-width: 0; border: 1px solid var(--rule); background: var(--panel); }
.concept-card:hover { border-color: var(--accent); }
.concept-card:hover .concept-card-title { text-decoration: underline; text-underline-offset: .18em; }
.concept-card-art { display: block; aspect-ratio: 1.75; background: var(--concept-bg); overflow: hidden; }
.concept-card-art img { width: 100%; height: 100%; object-fit: cover; object-position: center 48%; }
.concept-card-copy { display: block; padding: .75rem .82rem; }
.concept-card-tier { display: block; color: var(--accent); font-size: .74rem; font-weight: 650; }
.concept-card-title { display: block; margin-block: .2rem; font: 400 clamp(1.4rem, 2.35vw, 2.05rem)/1 var(--display); }
.concept-card-price { display: block; margin-top: .32rem; font-size: .78rem; color: var(--muted); }
.concepts-jump { margin-top: .75rem; }
.concept-page { padding-block: 1.5rem clamp(2.5rem, 5vw, 4.5rem); }
.concept-page .concept-return { margin-bottom: 1rem; }
.concept-page .board-controls { align-items: end; gap: .65rem; margin-block: 1rem; }
.concept-page .board-controls .form-select {
  padding: .5rem .65rem; min-height: 42px; max-width: 100%;
  color: var(--ink); background: var(--panel); border: 1px solid var(--rule); border-radius: 2px;
}
.concept-page .btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 42px; padding: .45rem .65rem; background: var(--panel);
  color: var(--ink); border: 1px solid var(--rule); border-radius: 2px; font-weight: 650; font-size: .82rem;
}
.concept-page .btn:hover { border-color: var(--accent); }
.concept-page .btn[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--button-ink); }
.concept-page .tier-entry { border-color: var(--rule); }
.concept-page .tier-estimate { color: var(--muted); }
.concept-page .brand-board { scroll-margin-top: .75rem; }
.concept-page .site .action { border-color: transparent; }
.concept-page .site :is(h3,h4,h5,h6) { color: inherit; }
.concept-page .site .opening-hero h4 { color: #9d261a; }
.concept-page .site .eyebrow { font-family: var(--body); }
.concept-page .concept-disclosure { margin-block: 0 .8rem; color: var(--muted); font-size: .9rem; }
.concept-page .site p > a[data-demo-inquiry] { display: inline-block; min-height: 0; width: fit-content; text-decoration: underline; }
.concept-page .site p.demo-notice { margin-block: .6rem 0; font-size: .87rem; }
.concept-page .seif-tier-collection { --border: var(--rule); --muted-foreground: var(--muted); }
@media (max-width: 58rem) { .concept-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 26rem) {
  .concept-grid { gap: .55rem; }
  .concept-card-copy { padding: .57rem .62rem; }
  .concept-card-tier { font-size: .69rem; }
  .concept-card-title { font-size: 1.3rem; }
}
.concept-sr { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }