:root {
  --brand: #2866ff;
  --brand-dark: #164ee0;
  --ink: #20262f;
  --muted: #707987;
  --line: #e6e9ee;
  --surface: #f6f7f9;
  --soft-blue: #eef4ff;
  --orange: #e49b18;
  --shadow: 0 18px 50px rgba(25, 42, 70, 0.09);
  --shell: 1360px;
  --viewer-bg-center: #596573;
  --viewer-bg-mid: #35404d;
  --viewer-bg-edge: #1d2530;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button { color: inherit; }
img, svg { display: block; max-width: 100%; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 999; padding: 10px 14px; background: #111; color: #fff; border-radius: 6px; }
.skip-link:focus { top: 16px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin-inline: auto; }

.utility-bar { border-top: 2px solid #cfe3ef; background: #f5f5f5; color: #737b85; font-size: 12px; }
.utility-inner { height: 34px; display: flex; align-items: center; justify-content: space-between; }
.utility-contact, .utility-links { display: flex; align-items: center; gap: 7px; }
.utility-contact svg { width: 13px; height: 13px; fill: currentColor; }
.utility-contact a:hover, .utility-links a:hover { color: var(--brand); }

.site-header { background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); position: relative; z-index: 30; }
.header-inner { height: 94px; display: flex; align-items: center; }
.brand { display: inline-flex; align-items: center; margin-right: 42px; }
.brand-word { color: var(--brand); font-weight: 700; font-size: 22px; letter-spacing: .02em; font-style: italic; }
.main-navigation { display: flex; align-items: center; gap: 44px; }
.main-navigation a { position: relative; font-weight: 650; font-size: 15px; color: #101419; }
.main-navigation a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -12px; height: 2px; background: var(--brand); transition: right .2s ease; }
.main-navigation a:hover::after { right: 0; }
.menu-toggle { display: none; margin-left: auto; width: 42px; height: 42px; border: 0; background: transparent; padding: 9px; cursor: pointer; }
.menu-toggle span:not(.sr-only) { width: 100%; height: 2px; margin: 5px 0; background: #1d2733; transition: .2s; }

.breadcrumb { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; padding-block: 16px 10px; color: #7d8692; font-size: 13px; }
.breadcrumb a:first-child { color: #1b232c; font-weight: 600; }
.breadcrumb a:hover { color: var(--brand); }
.breadcrumb span[aria-current="page"] { color: #69727e; }

.product-hero { min-height: 700px; display: grid; grid-template-columns: minmax(0, 1.04fr) minmax(420px, .96fr); gap: 76px; padding-top: 26px; padding-bottom: 34px; }
.product-gallery { min-width: 0; }
.viewer-stage {
  --viewer-border: #34404d;
  --viewer-loading-overlay: rgba(20,27,35,.14);
  --viewer-error-bg: #2f3946;
  --viewer-error-text: #f5f7fa;
  --viewer-error-muted: #c8d0da;
  position: relative;
  height: 585px;
  overflow: hidden;
  background: radial-gradient(circle at 45% 36%, var(--viewer-bg-center) 0, var(--viewer-bg-mid) 56%, var(--viewer-bg-edge) 100%);
  border: 1px solid var(--viewer-border);
  border-radius: 4px;
  transition: background .28s ease, border-color .28s ease;
}
.viewer-stage[data-viewer-theme="cool"] {
  --viewer-bg-center: #eef3f8;
  --viewer-bg-mid: #d8e1eb;
  --viewer-bg-edge: #c4cfdb;
  --viewer-border: #cfd8e3;
  --viewer-loading-overlay: rgba(216,225,235,.16);
  --viewer-error-bg: #d8e1eb;
  --viewer-error-text: #20262f;
  --viewer-error-muted: #626d79;
}
.viewer-stage[data-viewer-theme="warm"] {
  --viewer-bg-center: #fbf7ef;
  --viewer-bg-mid: #e9dfd2;
  --viewer-bg-edge: #d1c2b0;
  --viewer-border: #d9cdbf;
  --viewer-loading-overlay: rgba(233,223,210,.18);
  --viewer-error-bg: #e9dfd2;
  --viewer-error-text: #2d2924;
  --viewer-error-muted: #6e655b;
}
.viewer-stage[data-viewer-theme="dark"] {
  --viewer-bg-center: #596573;
  --viewer-bg-mid: #35404d;
  --viewer-bg-edge: #1d2530;
  --viewer-border: #34404d;
  --viewer-loading-overlay: rgba(20,27,35,.14);
  --viewer-error-bg: #2f3946;
  --viewer-error-text: #f5f7fa;
  --viewer-error-muted: #c8d0da;
}
model-viewer { width: 100%; height: 100%; --poster-color: transparent; background: radial-gradient(circle at 45% 36%, var(--viewer-bg-center) 0, var(--viewer-bg-mid) 56%, var(--viewer-bg-edge) 100%); outline: none; transition: background .28s ease; }
model-viewer::part(default-progress-bar) { display: none; }

.model-loading { position: absolute; inset: 0; display: grid; place-items: center; z-index: 8; pointer-events: none; background: var(--viewer-loading-overlay); transition: opacity .3s ease, visibility .3s ease, background .28s ease; }
.model-loading.is-hidden { opacity: 0; visibility: hidden; }
.loading-card { width: min(290px, calc(100% - 48px)); padding: 18px 20px; background: rgba(255,255,255,.9); backdrop-filter: blur(12px); border: 1px solid rgba(215,220,228,.9); border-radius: 12px; box-shadow: 0 12px 40px rgba(27,43,68,.12); }
.loading-title { font-weight: 650; font-size: 14px; margin-bottom: 11px; }
.progress-track { height: 5px; overflow: hidden; background: #e6eaf0; border-radius: 99px; }
.progress-track span { display: block; width: 0; height: 100%; background: var(--brand); border-radius: inherit; transition: width .15s ease; }
.loading-value { margin-top: 8px; color: var(--muted); font-size: 12px; text-align: right; }
.model-error { position: absolute; inset: 0; z-index: 12; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 32px; color: var(--viewer-error-text); background: var(--viewer-error-bg); transition: color .28s ease, background .28s ease; }
.model-error[hidden] { display: none; }
.error-icon { width: 44px; height: 44px; display: grid; place-items: center; background: #fff0f0; color: #d43636; border-radius: 50%; font-size: 24px; font-weight: 700; margin-bottom: 14px; }
.model-error p { max-width: 420px; margin: 8px 0 18px; color: var(--viewer-error-muted); }
.model-error button { border: 0; border-radius: 6px; padding: 9px 20px; color: #fff; background: var(--brand); cursor: pointer; }

.viewer-badge { position: absolute; left: 18px; top: 18px; z-index: 5; display: flex; align-items: center; gap: 7px; padding: 7px 10px; border-radius: 5px; color: var(--brand); background: rgba(255,255,255,.88); border: 1px solid rgba(40,102,255,.14); font-size: 11px; font-weight: 750; letter-spacing: .09em; pointer-events: none; }
.cube-icon { font-size: 17px; line-height: 1; }
.background-picker { position: absolute; left: 16px; bottom: 16px; z-index: 10; display: flex; align-items: center; gap: 9px; min-height: 40px; padding: 6px 9px 6px 12px; color: #46515f; background: rgba(255,255,255,.9); border: 1px solid rgba(215,222,231,.92); border-radius: 8px; box-shadow: 0 5px 16px rgba(25,42,70,.08); backdrop-filter: blur(9px); }
.background-picker-label { font-size: 11px; font-weight: 650; white-space: nowrap; }
.background-swatches { display: flex; align-items: center; gap: 6px; }
.background-swatch { width: 28px; height: 28px; display: grid; place-items: center; padding: 3px; border: 1px solid transparent; border-radius: 50%; background: transparent; cursor: pointer; transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease; }
.background-swatch:hover { transform: translateY(-1px); }
.background-swatch:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.background-swatch.is-selected { border-color: var(--brand); box-shadow: 0 0 0 1px rgba(40,102,255,.12); }
.swatch-color { width: 20px; height: 20px; border-radius: 50%; border: 1px solid rgba(30,40,55,.18); }
.swatch-cool { background: linear-gradient(135deg, #eef3f8 0 45%, #c4cfdb 100%); }
.swatch-warm { background: linear-gradient(135deg, #fbf7ef 0 45%, #d1c2b0 100%); }
.swatch-dark { background: linear-gradient(135deg, #596573 0 45%, #1d2530 100%); border-color: rgba(255,255,255,.35); }
.viewer-toolbar { position: absolute; right: 16px; top: 16px; z-index: 10; display: flex; gap: 8px; }
.tool-button { display: inline-flex; align-items: center; gap: 6px; min-height: 36px; padding: 0 10px; border: 1px solid #dfe4ea; background: rgba(255,255,255,.9); backdrop-filter: blur(8px); border-radius: 6px; color: #46515f; font-size: 12px; font-weight: 600; cursor: pointer; box-shadow: 0 5px 14px rgba(25,42,70,.06); }
.tool-button:hover, .tool-button.is-active { color: var(--brand); border-color: rgba(40,102,255,.35); background: #fff; }
.tool-button svg { width: 16px; height: 16px; fill: currentColor; }
.interaction-help { position: absolute; left: 50%; bottom: 16px; z-index: 7; transform: translateX(-50%); display: flex; align-items: center; gap: 7px; white-space: nowrap; padding: 8px 12px; border-radius: 99px; color: #596371; background: rgba(255,255,255,.84); border: 1px solid rgba(220,225,232,.85); font-size: 11px; pointer-events: none; transition: opacity .3s; }
.interaction-help svg { width: 16px; height: 16px; fill: currentColor; }
.interaction-help.is-hidden { opacity: 0; }
.gallery-thumbs { display: flex; gap: 12px; justify-content: center; padding-top: 24px; }
.thumb-button { position: relative; width: 72px; height: 72px; border: 1px solid #e0e4ea; background: #f7f8fa; border-radius: 4px; padding: 3px; overflow: hidden; cursor: pointer; }
.thumb-button.is-selected { border-color: var(--brand); box-shadow: 0 0 0 1px var(--brand); }
.thumb-button img { width: 100%; height: 100%; object-fit: cover; }
.thumb-button span { position: absolute; right: 4px; bottom: 3px; padding: 1px 4px; color: #fff; background: var(--brand); border-radius: 3px; font-size: 9px; font-weight: 700; }
.thumb-placeholder { display: grid; place-items: center; cursor: default; }
.thumb-placeholder svg { width: 26px; height: 26px; fill: #c6ccd5; }

.product-summary { padding-top: 10px; }
.eyebrow { color: var(--brand); font-size: 12px; font-weight: 750; letter-spacing: .12em; margin-bottom: 8px; }
.product-summary h1 { margin: 0 0 14px; color: #303741; font-size: clamp(30px, 3vw, 42px); font-weight: 450; line-height: 1.15; }
.part-number-row { min-height: 58px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 0 20px; color: #7c8490; background: #f7f7f7; border-radius: 7px; font-size: 13px; }
.view-count { color: #9a6b18; white-space: nowrap; }
.view-count strong { font-weight: 500; color: var(--orange); }
.summary-block { margin-top: 12px; }
.summary-block h2 { margin: 0 0 26px; font-size: 14px; color: #171c22; }
.feature-list { margin: 0; padding-left: 20px; color: #3f4854; font-size: 14px; line-height: 1.7; }
.summary-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 38px; }
.primary-action, .secondary-action { height: 44px; display: inline-flex; align-items: center; justify-content: center; border-radius: 4px; padding: 0 22px; font-size: 13px; font-weight: 650; cursor: pointer; }
.primary-action { background: var(--brand); color: #fff; border: 1px solid var(--brand); }
.primary-action:hover { background: var(--brand-dark); }
.secondary-action { background: #fff; color: #3e4855; border: 1px solid #d9dee5; }
.secondary-action:hover { border-color: var(--brand); color: var(--brand); }
.model-meta { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 26px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.model-meta div { padding: 16px 12px; }
.model-meta div + div { border-left: 1px solid var(--line); }
.model-meta span, .model-meta strong { display: block; }
.model-meta span { color: #8a929d; font-size: 11px; }
.model-meta strong { margin-top: 3px; color: #313943; font-size: 12px; font-weight: 650; }

.social-rail { position: fixed; right: max(16px, calc((100vw - var(--shell))/2 - 80px)); top: 55%; z-index: 25; transform: translateY(-50%); width: 53px; padding: 12px 8px 9px; display: flex; flex-direction: column; align-items: center; gap: 7px; background: #858585; border-radius: 13px 13px 0 0; box-shadow: 0 8px 25px rgba(0,0,0,.12); }
.share-label { color: #fff; text-align: center; font-size: 12px; line-height: 1.6; margin-bottom: 2px; }
.social { width: 25px; height: 25px; display: grid; place-items: center; color: #fff; border-radius: 7px; font-size: 14px; font-weight: 800; }
.facebook { background: #1778f2; } .youtube { background: #f00000; font-size: 10px; } .x-social { background: #050505; } .tiktok { background: #050505; text-shadow: 1px 1px #ff335f; } .pinterest { background: #bd081c; font-family: Georgia, serif; } .linkedin { background: #0a66c2; font-size: 10px; }

.section-tabs { position: sticky; top: 0; z-index: 20; background: rgba(246,246,246,.96); border-top: 1px solid #efefef; border-bottom: 1px solid #e5e5e5; backdrop-filter: blur(10px); }
.tabs-inner { height: 60px; display: flex; align-items: stretch; gap: 22px; overflow-x: auto; scrollbar-width: none; }
.tabs-inner::-webkit-scrollbar { display: none; }
.tab-button { position: relative; flex: 0 0 auto; padding: 0 4px; border: 0; background: transparent; color: #626b77; font-size: 13px; font-weight: 650; cursor: pointer; }
.tab-button:hover, .tab-button.is-active { color: #222b35; }
.tab-button::after { content: ""; position: absolute; left: 50%; right: 50%; bottom: 0; height: 2px; background: #ed3d35; transition: left .2s, right .2s; }
.tab-button.is-active::after { left: 0; right: 0; }

.product-content { padding-top: 12px; padding-bottom: 80px; }
.content-section { scroll-margin-top: 78px; padding: 76px 0; border-bottom: 1px solid var(--line); }
.section-heading { max-width: 730px; margin: 0 auto 42px; text-align: center; }
.section-heading.compact { margin-left: 0; text-align: left; }
.section-heading span { color: var(--brand); font-size: 11px; font-weight: 800; letter-spacing: .15em; }
.section-heading h2 { margin: 9px 0 12px; color: #26303b; font-size: clamp(26px, 3vw, 38px); font-weight: 500; line-height: 1.25; }
.section-heading p { margin: 0; color: #7a8390; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-grid article { min-height: 240px; padding: 32px; background: linear-gradient(145deg, #fff 0, #f7f9fc 100%); border: 1px solid #e9edf2; box-shadow: 0 12px 35px rgba(34,50,74,.05); }
.feature-number { color: var(--brand); font-size: 12px; font-weight: 800; }
.feature-grid h3 { margin: 44px 0 10px; font-size: 20px; font-weight: 600; }
.feature-grid p { color: #737d8a; margin: 0; }
.parameter-card { overflow: hidden; border: 1px solid var(--line); border-radius: 8px; }
.parameter-row { min-height: 60px; display: grid; grid-template-columns: minmax(180px, .8fr) 1.6fr; align-items: center; gap: 30px; padding: 12px 24px; }
.parameter-row:nth-child(odd) { background: #f7f8fa; }
.parameter-row span { color: #707987; }
.parameter-row strong { font-weight: 600; color: #2d3540; }
.topology-section { overflow: hidden; }
.topology-diagram { min-height: 350px; display: flex; align-items: center; justify-content: center; padding: 42px; background: radial-gradient(circle at center, #f8fbff, #f1f4f8); border: 1px solid #e5eaf0; border-radius: 10px; }
.topology-node { width: 142px; min-height: 102px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 9px; background: #fff; border: 1px solid #dfe5ed; border-radius: 9px; box-shadow: 0 10px 25px rgba(37,55,82,.07); text-align: center; }
.topology-node span { color: var(--brand); font-size: 27px; }
.topology-node strong { font-size: 13px; }
.cloud-node { border-color: #b8cffd; }
.product-node { border-color: var(--brand); box-shadow: 0 12px 32px rgba(40,102,255,.13); }
.topology-line { flex: 0 1 110px; height: 2px; background: linear-gradient(90deg, #b9c8dc, var(--brand)); }
.topology-line.split { background: linear-gradient(90deg, var(--brand), #b9c8dc); }
.topology-branches { display: flex; gap: 16px; }
.instruction-list { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; counter-reset: steps; }
.instruction-list li { counter-increment: steps; position: relative; min-height: 76px; padding: 18px 20px 18px 64px; background: #f7f8fa; border-radius: 6px; color: #68717e; }
.instruction-list li::before { content: counter(steps, decimal-leading-zero); position: absolute; left: 20px; top: 17px; color: var(--brand); font-weight: 800; }
.instruction-list strong { color: #2e3742; }
.video-placeholder { height: 380px; display: grid; place-items: center; align-content: center; gap: 12px; background: linear-gradient(135deg, #edf1f6, #f8f9fb); border: 1px solid #e1e6ec; }
.video-placeholder span { width: 66px; height: 66px; display: grid; place-items: center; padding-left: 4px; color: #fff; background: var(--brand); border-radius: 50%; font-size: 22px; box-shadow: 0 12px 30px rgba(40,102,255,.22); }
.video-placeholder p { color: #727b87; }
.accessory-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.accessory-grid article { padding: 22px; border: 1px solid var(--line); text-align: center; }
.accessory-image { height: 150px; display: grid; place-items: center; color: #6b7481; background: #f4f6f8; font-size: 23px; font-weight: 750; }
.accessory-grid h3 { margin: 17px 0 4px; font-size: 16px; }
.accessory-grid p { margin: 0; color: #8b939d; font-size: 13px; }
.download-list { border-top: 1px solid var(--line); }
.download-list > * { min-height: 78px; display: grid; grid-template-columns: 48px 1fr 30px; align-items: center; gap: 16px; border-bottom: 1px solid var(--line); padding: 10px 12px; }
.download-list a:hover { background: #f7f9fc; }
.file-icon { width: 42px; height: 42px; display: grid; place-items: center; color: var(--brand); background: var(--soft-blue); border-radius: 5px; font-size: 11px; font-weight: 800; }
.download-list strong, .download-list small { display: block; }
.download-list strong { font-size: 14px; }
.download-list small { color: #8b939e; margin-top: 2px; }
.download-arrow { color: var(--brand); font-size: 23px; }
.download-disabled { color: #a0a6ae; }
.accordion { border-top: 1px solid var(--line); }
.accordion details { border-bottom: 1px solid var(--line); }
.accordion summary { cursor: pointer; list-style: none; padding: 20px 38px 20px 4px; font-weight: 600; position: relative; }
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary::after { content: "+"; position: absolute; right: 8px; top: 16px; color: var(--brand); font-size: 24px; font-weight: 300; }
.accordion details[open] summary::after { content: "−"; }
.accordion p { margin: -4px 0 20px; color: #747d89; max-width: 850px; }
.company-strip { margin-top: 76px; padding: 38px 44px; display: flex; align-items: center; justify-content: space-between; gap: 30px; color: #fff; background: #1d2b3f; }
.company-strip span { color: #9db9e9; font-size: 11px; letter-spacing: .15em; font-weight: 800; }
.company-strip h2 { margin: 8px 0 0; font-size: 24px; font-weight: 500; }
.company-strip a { padding: 11px 20px; background: var(--brand); white-space: nowrap; }

.chat-widget { position: fixed; right: 0; bottom: 0; z-index: 28; width: 286px; filter: drop-shadow(0 8px 18px rgba(0,0,0,.14)); }
.chat-message { position: relative; padding: 18px 18px 20px; color: #555d67; background: #fff; border-radius: 10px 0 0 10px; font-size: 13px; line-height: 1.55; }
.chat-status { width: 100%; height: 46px; display: flex; align-items: center; gap: 9px; border: 0; color: #fff; background: #49a7da; padding: 0 18px; font-size: 16px; cursor: pointer; }
.chat-status span { width: 8px; height: 8px; background: #73ef9e; border-radius: 50%; box-shadow: 0 0 0 3px rgba(115,239,158,.18); }
.chat-close { position: absolute; right: 6px; top: -28px; width: 28px; height: 28px; border: 0; color: #fff; background: #49a7da; border-radius: 5px 5px 0 0; cursor: pointer; }
.chat-widget.is-hidden { display: none; }
.back-to-top { position: fixed; right: 8px; bottom: 118px; z-index: 27; width: 34px; height: 34px; border: 0; color: #fff; background: #21a2dc; font-size: 27px; line-height: 1; cursor: pointer; transform: rotate(0); }
.site-footer { color: #aeb8c5; background: #111b28; font-size: 12px; }
.footer-inner { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.footer-inner a:hover { color: #fff; }

@media (max-width: 1500px) {
  .social-rail { right: 12px; }
  .product-hero { gap: 48px; }
}

@media (max-width: 1180px) {
  .product-hero { grid-template-columns: 1fr 1fr; gap: 34px; }
  .viewer-stage { height: 520px; }
  .social-rail { display: none; }
  .chat-widget { width: 260px; }
  .topology-diagram { flex-wrap: wrap; gap: 14px; }
  .topology-line { flex-basis: 50px; }
  .topology-branches { flex-wrap: wrap; justify-content: center; }
}

@media (max-width: 900px) {
  .page-shell { width: min(calc(100% - 32px), var(--shell)); }
  .utility-links { display: none; }
  .header-inner { height: 70px; }
  .menu-toggle { display: block; }
  .main-navigation { position: absolute; left: 0; right: 0; top: 70px; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 8px 16px 18px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 14px 30px rgba(30,43,61,.1); }
  .main-navigation.is-open { display: flex; }
  .main-navigation a { padding: 13px 8px; }
  .main-navigation a::after { display: none; }
  .product-hero { grid-template-columns: 1fr; min-height: 0; gap: 30px; padding-top: 10px; }
  .product-summary { padding-top: 0; }
  .viewer-stage { height: min(620px, 75vw); min-height: 430px; }
  .feature-grid, .accessory-grid { grid-template-columns: 1fr; }
  .instruction-list { grid-template-columns: 1fr; }
  .topology-diagram { flex-direction: column; }
  .topology-line { width: 2px; height: 42px; flex: 0 0 42px; background: linear-gradient(#b9c8dc, var(--brand)); }
  .topology-line.split { background: linear-gradient(var(--brand), #b9c8dc); }
  .topology-branches { width: 100%; }
  .chat-widget { display: none; }
  .back-to-top { bottom: 14px; }
}

@media (max-width: 600px) {
  .page-shell { width: min(calc(100% - 24px), var(--shell)); }
  .utility-inner { height: 32px; justify-content: center; }
  .utility-contact { font-size: 10px; gap: 5px; }
  .brand-word { font-size: 20px; }
  .breadcrumb { gap: 7px; padding-block: 12px 4px; font-size: 11px; }
  .product-hero { padding-bottom: 22px; }
  .viewer-stage { height: 420px; min-height: 0; border-radius: 0; }
  .viewer-toolbar { top: 10px; right: 10px; gap: 5px; }
  .tool-button { width: 38px; min-height: 36px; padding: 0; justify-content: center; }
  .tool-button span { display: none; }
  .viewer-badge { left: 10px; top: 10px; }
  .background-picker { left: 10px; bottom: 10px; min-height: 36px; padding: 4px 6px; }
  .background-picker-label { display: none; }
  .background-swatch { width: 26px; height: 26px; padding: 3px; }
  .swatch-color { width: 18px; height: 18px; }
  .interaction-help { bottom: 10px; font-size: 10px; }
  .gallery-thumbs { padding-top: 14px; }
  .thumb-button { width: 58px; height: 58px; }
  .product-summary h1 { font-size: 30px; }
  .part-number-row { min-height: 52px; padding-inline: 14px; font-size: 11px; }
  .summary-block h2 { margin-bottom: 16px; }
  .feature-list { font-size: 13px; }
  .summary-actions { margin-top: 24px; }
  .primary-action, .secondary-action { flex: 1 1 150px; padding-inline: 12px; }
  .model-meta { grid-template-columns: 1fr; }
  .model-meta div + div { border-left: 0; border-top: 1px solid var(--line); }
  .tabs-inner { height: 52px; gap: 16px; }
  .content-section { padding: 52px 0; }
  .section-heading { margin-bottom: 30px; }
  .feature-grid article { min-height: 200px; padding: 26px; }
  .feature-grid h3 { margin-top: 28px; }
  .parameter-row { grid-template-columns: 1fr; gap: 3px; padding: 14px 16px; }
  .topology-diagram { padding: 26px 14px; }
  .topology-branches { flex-direction: column; align-items: center; }
  .video-placeholder { height: 260px; }
  .company-strip { margin-top: 52px; padding: 28px 22px; flex-direction: column; align-items: flex-start; }
  .footer-inner { min-height: 80px; flex-direction: column; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

.viewer-stage:fullscreen,
.viewer-stage:-webkit-full-screen {
  width: 100vw;
  height: 100vh;
  min-height: 100vh;
  border-radius: 0;
  background: radial-gradient(circle at 45% 36%, var(--viewer-bg-center) 0, var(--viewer-bg-mid) 56%, var(--viewer-bg-edge) 100%);
}