.product-page { padding-bottom: 1.5rem; }
.product-summary { grid-column: 2; grid-row: 1; }
.product-hero > .product-viewer, .product-hero > .product-placeholder { grid-column: 1; grid-row: 1; }
.breadcrumbs { display: flex; flex-wrap: wrap; align-items: baseline; gap: .4rem .7rem; padding-block: 1.5rem; color: var(--muted); font-size: .8rem; }
.breadcrumbs [aria-current] { color: var(--ink); }
.product-hero { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: clamp(1.5rem, 4vw, 4rem); align-items: start; padding-bottom: 2.5rem; }
.product-viewer { position: relative; border: 1px solid var(--line); border-radius: .6rem; overflow: hidden; background: var(--surface); min-width: 0;  }
.viewer-topline { display: flex; justify-content: space-between; align-items: center; gap: .5rem; padding: .85rem 1rem; border-bottom: 1px solid var(--line); }
.viewer-badge { text-transform: uppercase; font-size: .66rem; font-weight: 800; letter-spacing: .1em; display: flex; align-items: center; gap: .5rem; }
.viewer-badge::before { content: ''; width: .4rem; height: .4rem; background: var(--accent); border-radius: 50%; }
.viewer-topline output { color: var(--accent); font: 700 .8rem ui-monospace, monospace; }
.viewer-stage { position: relative; height: clamp(20rem, 37vw, 34rem); display: grid; place-items: center; background: #fff; overflow: hidden; perspective: 1000px; isolation: isolate; cursor: default; }
.viewer-stage:focus-visible { outline-offset: -5px; }
.viewer-stage.is-zoomed { cursor: grab; }
.viewer-stage.is-dragging { cursor: grabbing; }
.viewer-object { position: absolute; inset: 6.5%; min-width: 0; min-height: 0; display: grid; place-items: center; transform-origin: center; will-change: transform; }
.viewer-object img { width: 100%; height: 100%; min-width: 0; min-height: 0; max-height: 100%; object-fit: contain; user-select: none; -webkit-user-drag: none; }
.viewer-grid { position: absolute; inset: 0; pointer-events: none; opacity: 0; background-image: linear-gradient(#951f2b20 1px, transparent 1px), linear-gradient(90deg, #951f2b20 1px, transparent 1px); background-size: 40px 40px; transition: opacity .2s; }
.is-inspecting .viewer-grid { opacity: 1; }
.viewer-corner { position: absolute; width: 24px; height: 24px; border-color: #951f2b; border-style: solid; pointer-events: none; opacity: .55; }
.viewer-corner--tl { inset: 1rem auto auto 1rem; border-width: 1px 0 0 1px; }
.viewer-corner--br { inset: auto 1rem 1rem auto; border-width: 0 1px 1px 0; }
.viewer-controls { padding: .85rem 1rem .65rem; border-top: 1px solid var(--line); }
.viewer-tools, .viewer-options { display: flex; flex-wrap: wrap; gap: .4rem; }
.viewer-tools { justify-content: space-between; }
.viewer-tools button, .viewer-options button { min-width: 44px; min-height: 44px; border: 1px solid var(--control-line); border-radius: .3rem; background: transparent; color: var(--ink); padding: .4rem .65rem; cursor: pointer; font-size: .74rem; font-weight: 700; }
.viewer-tools button { display: inline-flex; flex-direction: column; align-items: center; justify-content: center; gap: .15rem; flex: 1; }
.viewer-tools button > span:first-child { font-size: 1.2rem; line-height: 1; }
.viewer-tools button:disabled, .viewer-options button:disabled { opacity: .45; cursor: default; }
.viewer-tools button:hover:not(:disabled), .viewer-options button:hover:not(:disabled) { background: var(--pale); }
.viewer-options { margin-top: .65rem; }
.viewer-options [aria-pressed="true"] { color: var(--chip-selected-ink); background: var(--chip-selected); }
.viewer-options button[aria-pressed="true"]:hover:not(:disabled) { color: var(--chip-selected-ink); background: var(--chip-selected); }
.viewer-controls > p, .viewer-disclaimer { font-size: .74rem; color: var(--muted); line-height: 1.5; }
.viewer-controls > p { margin-top: .75rem; }
.viewer-disclaimer { padding: .2rem 1rem .9rem; }
.viewer-angle { display: flex; align-items: center; gap: 1rem; font-size: .8rem; margin-top: .8rem; }
.viewer-angle input { flex: 1; min-width: 0; accent-color: var(--accent-button); }
.product-summary { padding-top: 1rem;  min-width: 0; }
.product-summary h1 { font-size: clamp(2.2rem, 3.5vw, 3.8rem); overflow-wrap: anywhere; }
.product-reference { color: var(--muted); font: .8rem ui-monospace, monospace; margin-top: 1rem; }
.product-reference strong { color: var(--accent); user-select: all; }
.product-summary .lead { max-width: 52ch; }
.product-summary-actions { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem; margin-block: 1.6rem; }
.copy-reference { color: var(--accent); border: 0; background: transparent; cursor: pointer; padding: .6rem 0; min-height: 44px; }
.copy-feedback { width: 100%; font-size: .8rem; color: var(--muted); }
.copy-feedback:empty { display: none; }
.product-facts > div { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: .5rem 1rem; padding-block: .7rem; border-top: 1px solid var(--line); font-size: .86rem; }
.product-facts dt { font-weight: 750; }
.product-facts dd { color: var(--muted); overflow-wrap: anywhere; }
.product-jump { display: flex; flex-wrap: wrap; gap: .6rem 1.7rem; border-block: 1px solid var(--line); padding-block: .8rem; font-size: .8rem; font-weight: 700; }
.product-jump a { min-height: 44px; display: inline-flex; align-items: center; }
.product-information { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: clamp(1.5rem, 5vw, 4.5rem); margin-block: 3rem; }
.product-information h2 { font-size: clamp(1.7rem, 2.4vw, 2.3rem); }
.product-information h3 { font-size: 1rem; line-height: 1.4; margin-top: 1.2rem; letter-spacing: 0; }
.product-information p { margin-top: .9rem; color: var(--muted); max-width: 70ch; }
.product-information .text-link { margin-top: 1rem; color: var(--accent); }
.product-contact { font-size: .85rem; }
.product-information--extended { grid-template-columns: minmax(0, 2.25fr) minmax(15rem, 1fr); align-items: start; }
.product-detail-body, .product-purchase { min-width: 0; }
.product-detail-section { scroll-margin-top: 7rem; }
.product-detail-body > .product-detail-section + .product-detail-section { border-top: 1px solid var(--line); margin-top: 2.4rem; padding-top: 2.4rem; }
.product-information--extended h2 { line-height: 1.2; }
.product-information--extended p, .product-steps { line-height: 1.8; }
.product-purchase { border: 1px solid var(--line); border-radius: .6rem; background: var(--surface); padding: clamp(1rem, 2vw, 1.7rem); }
.product-purchase h2 { font-size: clamp(1.4rem, 2vw, 1.8rem); }
.product-information .product-source-note, .product-information .product-spec-note { font-size: .8rem; }
.product-specifications { width: 100%; table-layout: fixed; border-collapse: collapse; margin-top: 1.3rem; font-size: .87rem; }
.product-specifications th, .product-specifications td { text-align: left; vertical-align: top; padding: .8rem .7rem; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; line-height: 1.6; }
.product-specifications th { width: 49%; font-weight: 700; }
.product-specifications thead { background: var(--pale); }
.product-specifications td { color: var(--muted); }
.product-steps { padding-left: 1.5rem; margin-top: 1rem; color: var(--muted); }
.product-steps li { padding-left: .4rem; margin-top: .75rem; }
.product-steps li::marker { color: var(--accent); font-weight: 800; }
.product-faq { margin-top: 1.1rem; }
.product-faq details { border-bottom: 1px solid var(--line); padding-block: 1rem; }
.product-faq summary { cursor: pointer; font-weight: 700; line-height: 1.6; padding-right: .4rem; }
.product-faq summary::marker { color: var(--accent); }
.product-faq details[open] { padding-bottom: 1.3rem; }
@media (max-width: 1050px) { .product-information--extended { grid-template-columns: minmax(0, 1fr); } }
.related-products > h2 { margin-bottom: 1.3rem; }
.related-products h3 { font-size: 1.4rem; }
.product-placeholder { min-height: 24rem; display: flex; flex-direction: column; justify-content: center; gap: 1rem; padding: 2rem; background: var(--pale); border: 1px solid var(--line); }
.product-placeholder > strong { font-size: clamp(2rem, 4vw, 4rem); font-weight: 800; line-height: 1.1; }
.product-placeholder > span { font-size: .8rem; color: var(--accent); font-weight: 750; }
.product-placeholder > p { font-size: .85rem; color: var(--muted); }
.product-viewer.is-expanded { position: fixed; inset: 1rem; z-index: 100; box-shadow: 0 0 0 100vmax #000b; display: flex; flex-direction: column; max-width: none; animation: none; }
.product-viewer:fullscreen { inset: 0; border: none; border-radius: 0; width: 100%; height: 100%; }
.is-expanded .viewer-stage { flex: 1; height: auto; min-height: 100px; }
.is-expanded .viewer-topline { padding-right: 12rem; }
.is-expanded .viewer-tools { justify-content: center; }
.is-expanded .viewer-tools button { flex: 0 1 8rem; }
.viewer-close { position: absolute; right: .6rem; top: .4rem; z-index: 2; background: var(--surface); color: var(--ink); border: 1px solid var(--control-line); border-radius: .3rem; min-height: 44px; cursor: pointer; padding: .4rem .6rem; font-size: .8rem; }
.catalogue-item { position: relative; transition: transform .2s, box-shadow .2s; }
.product-card-link { text-decoration: none; }
.product-card-link::after { position: absolute; content: ''; inset: 0; border-radius: .28rem; }
.product-card-link:focus-visible { outline: none; }
.product-card-link:focus-visible::after { outline: 3px solid var(--focus); outline-offset: 3px; }
.catalogue-item:hover { transform: translateY(-3px); box-shadow: 0 8px 24px #0000000b; }
.catalogue-item .chemical-details, .catalogue-item .catalogue-links { position: relative; z-index: 1; }
.catalogue-item h5 a:hover { color: var(--accent); }
.catalogue-item .product-detail-link { color: var(--accent); }
@keyframes product-arrive { from { opacity: 0; transform: translateY(15px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 850px) { .product-hero { grid-template-columns: minmax(0, 1fr); } .viewer-stage { height: clamp(20rem, 70vw, 32rem); } .product-summary { padding-top: 0; } }
@media (max-width: 850px) {
  .product-summary { grid-column: 1; grid-row: 1; }
  .product-hero > .product-viewer, .product-hero > .product-placeholder { grid-column: 1; grid-row: 2; }
}
@media (max-width: 650px) {
  .product-information { grid-template-columns: minmax(0, 1fr); margin-block: 2rem; }
  .viewer-controls { padding-inline: .6rem; }
  .viewer-tools button { padding-inline: .3rem; font-size: .68rem; }
  .product-viewer.is-expanded { inset: .4rem; }
  .is-expanded .viewer-topline { padding-right: 10rem; }
}
@media (prefers-reduced-motion: reduce) {
  .product-summary, .product-viewer { animation: none; }
  .catalogue-item:hover { transform: none; }
}