:root {
  --ink: #17211f;
  --muted: #61706d;
  --line: #d9e0de;
  --line-strong: #b7c3c0;
  --canvas: #f4f7f6;
  --surface: #ffffff;
  --surface-alt: #eaf0ee;
  --brand: #007d6e;
  --brand-dark: #005f54;
  --brand-soft: #dff3ee;
  --signal: #f3bb21;
  --success: #1d8654;
  --warning: #a76500;
  --danger: #c43b32;
  --header: #17211f;
  --shell: 1440px;
  --radius: 4px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: "IBM Plex Sans", "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  letter-spacing: 0;
}
button, input, select { font: inherit; letter-spacing: 0; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }
button { border: 0; background: none; cursor: pointer; }
svg { width: 18px; height: 18px; stroke-width: 1.8; }
.shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.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: 12px; top: 12px; z-index: 100; padding: 10px 16px; visibility: hidden; background: var(--surface); border: 2px solid var(--brand); transform: translateY(-200%); }
.skip-link:focus { visibility: visible; transform: translateY(0); }

.utility-bar { height: 32px; color: #cdd8d5; background: #0c1412; font-size: 12px; }
.utility-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.utility-inner nav { display: flex; height: 100%; }
.utility-inner a { display: flex; align-items: center; padding: 0 14px; border-left: 1px solid #2f3a37; }
.utility-inner a:hover { color: #fff; background: #222c29; }
.site-header { position: sticky; top: 0; z-index: 40; background: var(--surface); border-bottom: 1px solid var(--line); }
.main-nav { min-height: 72px; display: grid; grid-template-columns: 225px 150px minmax(320px, 720px) 1fr; align-items: center; gap: 16px; }
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand-mark { width: 38px; height: 38px; display: flex; gap: 3px; align-items: end; padding: 7px; background: var(--brand); }
.brand-mark i { display: block; width: 6px; background: #fff; }
.brand-mark i:nth-child(1) { height: 15px; }
.brand-mark i:nth-child(2) { height: 24px; }
.brand-mark i:nth-child(3) { height: 19px; }
.brand strong { display: block; font-family: "IBM Plex Mono", monospace; font-size: 17px; font-weight: 600; }
.brand small { display: block; color: var(--muted); font-size: 12px; }
.category-trigger { height: 44px; display: flex; align-items: center; justify-content: center; gap: 10px; color: #fff; background: var(--ink); }
.category-trigger:hover, .category-trigger[aria-expanded="true"] { background: var(--brand-dark); }
.global-search { height: 44px; display: grid; grid-template-columns: 1fr 100px; background: var(--surface-alt); border-bottom: 2px solid var(--ink); }
.global-search:focus-within { outline: 2px solid var(--brand); outline-offset: -2px; border-color: transparent; }
.global-search input { min-width: 0; padding: 0 16px; color: var(--ink); background: transparent; border: 0; outline: 0; }
.global-search button { display: flex; align-items: center; justify-content: center; gap: 8px; color: #fff; background: var(--brand); }
.global-search button:hover { background: var(--brand-dark); }
.mobile-menu { display: none; width: 44px; height: 44px; align-items: center; justify-content: center; background: var(--surface-alt); }
.category-panel { position: absolute; left: 0; right: 0; top: 104px; background: var(--surface); border-top: 1px solid var(--line); border-bottom: 3px solid var(--brand); box-shadow: 0 10px 25px rgba(23,33,31,.16); }
.category-panel-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; padding: 24px 0; background: var(--line); }
.panel-category { min-height: 150px; padding: 18px; background: var(--surface); }
.panel-category strong { display: block; margin-bottom: 10px; font-size: 16px; }
.panel-category button { display: block; padding: 5px 0; color: var(--muted); text-align: left; }
.panel-category button:hover { color: var(--brand); text-decoration: underline; }

.view { min-height: 70vh; }
.home-grid { position: relative; background: var(--surface); }
.category-rail { position: absolute; top: 0; left: 0; z-index: 2; width: 240px; min-height: 320px; border-left: 1px solid var(--line); border-right: 1px solid var(--line); }
.rail-heading { height: 40px; display: flex; align-items: center; justify-content: space-between; padding: 0 16px; color: #fff; background: var(--ink); }
.rail-heading span { font-weight: 600; }
.rail-heading small { color: #9fb0ac; font-family: "IBM Plex Mono", monospace; }
.rail-item { position: relative; width: 100%; min-height: 35px; display: grid; grid-template-columns: 24px 1fr 18px; align-items: center; gap: 8px; padding: 6px 12px; text-align: left; border-bottom: 1px solid var(--line); }
.rail-item:hover { color: var(--brand); background: var(--brand-soft); }
.rail-item svg { color: var(--brand); }
.rail-item span { display: block; font-weight: 500; }
.rail-item small { display: none; }
.home-main { min-width: 0; border-right: 1px solid var(--line); }
.home-main .selection-intro { margin-left: 240px; }
.selection-intro { min-height: 320px; display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(360px, .8fr); overflow: hidden; border-bottom: 1px solid var(--line); }
.selection-copy { display: flex; flex-direction: column; justify-content: center; padding: 48px; }
.eyebrow { display: block; margin-bottom: 8px; color: var(--brand); font: 600 11px/1.2 "IBM Plex Mono", monospace; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 16px; font-size: 40px; line-height: 1.16; font-weight: 500; }
h2 { margin-bottom: 0; font-size: 25px; line-height: 1.25; font-weight: 500; }
.selection-copy p { max-width: 660px; margin-bottom: 20px; color: var(--muted); font-size: 16px; }
.quick-searches { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; color: var(--muted); }
.quick-searches button { padding: 5px 8px; color: var(--brand-dark); background: var(--brand-soft); border: 1px solid #bdded6; }
.quick-searches button:hover { color: #fff; background: var(--brand); }
.image-placeholder { position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; padding: 24px; color: #465652; text-align: center; background-color: #edf2f0; border: 1px dashed #829590; }
.image-placeholder::after { content: "图片待上传"; position: absolute; right: 10px; bottom: 8px; padding: 4px 6px; color: #54645f; background: rgba(255,255,255,.82); font: 500 10px/1 "IBM Plex Mono", monospace; }
.image-placeholder.transparent-slot { background-color: #edf2f0; background-image: linear-gradient(45deg, #d8e2df 25%, transparent 25%), linear-gradient(-45deg, #d8e2df 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #d8e2df 75%), linear-gradient(-45deg, transparent 75%, #d8e2df 75%); background-size: 24px 24px; background-position: 0 0, 0 12px, 12px -12px, -12px 0; }
.image-placeholder svg { width: 28px; height: 28px; color: var(--brand); }
.image-placeholder strong { font-size: 15px; }
.image-placeholder span, .image-placeholder small { max-width: 360px; }
.hero-placeholder { min-height: 320px; border: 0; border-left: 1px solid var(--line); }
.metrics-strip { display: grid; grid-template-columns: repeat(4, 1fr); border-bottom: 1px solid var(--line); }
.metrics-strip div { min-height: 96px; display: flex; flex-direction: column; justify-content: center; padding: 16px 24px; border-right: 1px solid var(--line); }
.metrics-strip div:last-child { border: 0; }
.metrics-strip strong { font: 600 22px/1.1 "IBM Plex Mono", monospace; }
.metrics-strip span { margin-top: 5px; color: var(--muted); font-size: 12px; }
.content-section { padding: 40px 32px; border-bottom: 1px solid var(--line); }
.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.section-heading .eyebrow { margin-bottom: 5px; }
.section-note { color: var(--muted); }
.text-action { display: inline-flex; align-items: center; gap: 8px; color: var(--brand-dark); padding: 8px 0; }
.text-action:hover { text-decoration: underline; }
.text-action svg { width: 16px; }
.category-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.category-card { min-height: 156px; display: flex; flex-direction: column; padding: 18px; text-align: left; background: var(--surface); }
.category-card:hover { background: var(--brand-soft); }
.category-card .category-icon { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; color: var(--brand); background: var(--surface-alt); }
.category-card h3 { margin: 15px 0 5px; font-size: 16px; }
.category-card { position: relative; }
.category-card p { margin: 0; padding-right: 24px; color: var(--muted); font-size: 12px; }
.category-card > svg { position: absolute; right: 16px; bottom: 17px; }
.brand-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; }
.brand-tile { min-height: 86px; display: flex; flex-direction: column; justify-content: center; padding: 12px; background: var(--surface-alt); border-bottom: 2px solid transparent; }
.brand-tile:hover { border-color: var(--brand); }
.brand-tile strong { font: 600 16px/1.2 "IBM Plex Mono", monospace; }
.brand-tile small { margin-top: 6px; color: var(--muted); }
.asset-slots { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.asset-slot { min-height: 160px; }
.asset-slot strong { font-size: 13px; }
.asset-slot span { max-width: 150px; font-size: 11px; }

.breadcrumbs { min-height: 48px; display: flex; align-items: center; gap: 6px; color: var(--muted); border-bottom: 1px solid var(--line); }
.breadcrumbs button { color: var(--brand-dark); }
.breadcrumbs svg { width: 14px; }
.breadcrumbs strong { color: var(--ink); font-weight: 500; }
.catalog-heading { min-height: 210px; display: grid; grid-template-columns: 1fr 320px; background: var(--surface); border: 1px solid var(--line); border-top: 0; }
.catalog-heading > div:first-child { display: flex; flex-direction: column; justify-content: center; padding: 32px; }
.catalog-heading h1 { margin-bottom: 8px; font-size: 32px; }
.catalog-heading p { margin: 0; color: var(--muted); }
.catalog-visual { border: 0; border-left: 1px solid var(--line); }
.image-placeholder.compact { min-height: 160px; }
.subcategories { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; margin: 16px 0; background: var(--line); border: 1px solid var(--line); }
.subcategory { min-height: 82px; padding: 14px; text-align: left; background: var(--surface); }
.subcategory:hover, .subcategory.active { color: var(--brand-dark); background: var(--brand-soft); }
.subcategory strong { display: block; margin-bottom: 5px; }
.subcategory small { color: var(--muted); }
.catalog-layout { display: grid; grid-template-columns: 250px minmax(0, 1fr); align-items: start; gap: 16px; padding-bottom: 48px; }
.filters { background: var(--surface); border: 1px solid var(--line); }
.mobile-filter-toggle { display: none; }
.filter-title { height: 50px; display: flex; align-items: center; justify-content: space-between; padding: 0 16px; color: #fff; background: var(--ink); }
.filter-title button { color: #b8c5c2; font-size: 12px; }
.filter-group { padding: 15px 16px; border-bottom: 1px solid var(--line); }
.filter-group > strong { display: block; margin-bottom: 10px; font-size: 13px; }
.check-row { display: flex; align-items: center; gap: 8px; min-height: 30px; color: var(--muted); cursor: pointer; }
.check-row input { width: 16px; height: 16px; accent-color: var(--brand); }
.check-row span { margin-left: auto; color: #8a9794; font-size: 11px; }
.results-area { min-width: 0; }
.selected-filters { display: flex; flex-wrap: wrap; gap: 8px; min-height: 0; }
.selected-filters:not(:empty) { margin-bottom: 12px; }
.filter-chip { display: flex; align-items: center; gap: 6px; padding: 6px 9px; color: var(--brand-dark); background: var(--brand-soft); border: 1px solid #b8ddd4; }
.filter-chip svg { width: 13px; }
.results-toolbar { min-height: 50px; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 8px 12px; background: var(--surface); border: 1px solid var(--line); }
.results-toolbar strong { font: 600 18px/1 "IBM Plex Mono", monospace; }
.toolbar-actions { display: flex; align-items: center; gap: 8px; color: var(--muted); }
.toolbar-actions select { height: 34px; padding: 0 28px 0 10px; color: var(--ink); background: var(--surface-alt); border: 1px solid var(--line-strong); }
.segmented { display: flex; border: 1px solid var(--line-strong); }
.segmented button { width: 34px; height: 32px; display: flex; align-items: center; justify-content: center; }
.segmented button.active { color: #fff; background: var(--brand); }
.product-results { margin-top: 10px; }
.result-card { display: grid; grid-template-columns: 150px minmax(0, 1fr) 250px; min-height: 185px; margin-bottom: 8px; background: var(--surface); border: 1px solid var(--line); }
.result-image { min-height: 183px; border: 0; border-right: 1px solid var(--line); }
.result-image strong { font-size: 12px; }
.result-image span { font-size: 10px; }
.result-info { padding: 18px 20px; }
.result-brand { color: var(--brand); font-size: 12px; font-weight: 600; }
.result-info h3 { margin: 6px 0 4px; font-size: 17px; }
.result-model { margin-bottom: 13px; font: 500 14px/1.4 "IBM Plex Mono", monospace; }
.result-params { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.result-params span { padding: 7px; color: var(--muted); font-size: 11px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.result-params strong { display: block; color: var(--ink); font-size: 12px; }
.result-action { display: flex; flex-direction: column; justify-content: center; padding: 18px; background: #f8faf9; border-left: 1px solid var(--line); }
.stock-badge { width: fit-content; display: inline-flex; align-items: center; padding: 4px 7px; font-size: 11px; font-weight: 500; }
.stock-badge.in-stock { color: var(--success); background: #e0f4e9; }
.stock-badge.preorder { color: var(--warning); background: #fff0d7; }
.result-action strong { margin: 12px 0; font-size: 16px; }
.primary-action { min-height: 42px; display: flex; align-items: center; justify-content: space-between; padding: 0 13px; color: #fff; background: var(--brand); }
.primary-action:hover { background: var(--brand-dark); }
.product-results.grid-mode { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.grid-mode .result-card { display: flex; flex-direction: column; min-width: 0; margin: 0; }
.grid-mode .result-image { min-height: 210px; border: 0; border-bottom: 1px solid var(--line); }
.grid-mode .result-info { flex: 1; }
.grid-mode .result-params { grid-template-columns: 1fr; }
.grid-mode .result-action { border: 0; border-top: 1px solid var(--line); }

.product-layout { display: grid; grid-template-columns: minmax(440px, .9fr) minmax(480px, 1.1fr); gap: 24px; padding: 24px; background: var(--surface); border: 1px solid var(--line); border-top: 0; }
.main-product-image { width: 100%; aspect-ratio: 1 / 1; min-height: 440px; }
.image-slot-index { position: absolute; left: 12px; top: 12px; padding: 5px 7px; color: #fff; background: var(--ink); font: 500 10px/1 "IBM Plex Mono", monospace; }
.thumbnail-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; margin-top: 8px; }
.thumbnail { min-width: 0; aspect-ratio: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 5px; padding: 8px; color: var(--muted); background: var(--surface-alt); border: 1px solid var(--line); }
.thumbnail.active { color: var(--brand-dark); border: 2px solid var(--brand); }
.thumbnail svg { width: 18px; }
.thumbnail span { font-size: 10px; }
.product-summary { padding: 8px 8px 8px 0; }
.product-brand-row { display: flex; align-items: center; justify-content: space-between; }
.brand-chip { padding: 6px 9px; color: var(--brand-dark); background: var(--brand-soft); font: 600 12px/1.2 "IBM Plex Mono", monospace; }
.product-summary h1 { margin: 20px 0 10px; font-size: 30px; }
.model-line { display: flex; align-items: center; gap: 9px; color: var(--muted); }
.model-line strong { color: var(--ink); font: 600 17px/1.4 "IBM Plex Mono", monospace; }
.model-line button { width: 30px; height: 30px; display: flex; align-items: center; justify-content: center; }
.product-lead { color: var(--muted); font-size: 15px; }
.price-panel { display: grid; grid-template-columns: 100px 1fr; gap: 4px 16px; margin: 22px 0; padding: 16px; background: #f1f5f3; border-left: 4px solid var(--signal); }
.price-panel > span { grid-row: 1 / 3; color: var(--muted); }
.price-panel strong { font-size: 22px; }
.price-panel small { color: var(--muted); }
.spec-selector { border-top: 1px solid var(--line); }
.spec-heading { display: flex; justify-content: space-between; padding: 15px 0 10px; }
.spec-heading span { color: var(--muted); font-size: 12px; }
.spec-row { display: grid; grid-template-columns: 100px 1fr; align-items: center; min-height: 52px; border-top: 1px solid var(--line); }
.spec-row label { color: var(--muted); }
.spec-row > div { display: flex; flex-wrap: wrap; gap: 7px; }
.spec-option { min-width: 64px; height: 34px; padding: 0 10px; background: var(--surface-alt); border: 1px solid var(--line-strong); }
.spec-option:hover, .spec-option.active { color: var(--brand-dark); background: var(--brand-soft); border-color: var(--brand); }
.contact-panel { margin-top: 20px; padding: 16px; background: var(--ink); color: #fff; }
.contact-panel > div:first-child { display: flex; align-items: center; gap: 16px; }
.contact-panel .eyebrow { margin: 0; color: #72d2c1; }
.contact-panel small { margin-left: auto; color: #aebcb9; }
.sales-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; margin-top: 14px; }
.sales-person { display: grid; grid-template-columns: 40px 1fr 36px; align-items: center; gap: 10px; padding: 9px; background: #26322f; }
.sales-avatar { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; color: #fff; background: var(--brand); font-weight: 600; }
.sales-person strong, .sales-person span { display: block; }
.sales-person span { color: #b6c3c0; font-size: 11px; }
.sales-person button { width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; color: #fff; background: var(--brand); }
.product-tabs { position: sticky; top: 104px; z-index: 10; display: flex; margin-top: 16px; background: var(--surface); border: 1px solid var(--line); }
.product-tabs button { min-width: 140px; height: 50px; border-right: 1px solid var(--line); }
.product-tabs button.active { color: var(--brand-dark); box-shadow: inset 0 -3px var(--brand); }
.tab-content { min-height: 420px; padding: 28px; margin-bottom: 48px; background: var(--surface); border: 1px solid var(--line); border-top: 0; }
.parameter-table { width: 100%; border-collapse: collapse; }
.parameter-table th, .parameter-table td { width: 25%; padding: 13px; text-align: left; border: 1px solid var(--line); }
.parameter-table th { color: var(--muted); background: var(--surface-alt); font-weight: 500; }
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.feature-item { min-height: 150px; padding: 20px; background: var(--surface); }
.feature-item svg { color: var(--brand); }
.feature-item strong { display: block; margin: 24px 0 7px; }
.feature-item p { margin: 0; color: var(--muted); }
.detail-placeholder { width: min(100%, 790px); min-height: 470px; margin: auto; }
.document-list { border-top: 1px solid var(--line); }
.document-row { min-height: 58px; display: grid; grid-template-columns: 42px 1fr 120px; align-items: center; gap: 12px; border-bottom: 1px solid var(--line); }
.document-row svg { color: var(--brand); }
.document-row small { color: var(--muted); }

.site-footer { color: #d8e1df; background: var(--header); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; padding: 40px 0; }
.footer-grid strong { color: #fff; font-size: 18px; }
.footer-grid p { margin: 8px 0 0; color: #aebbb8; }
.footer-grid > div > span { display: block; margin-bottom: 10px; color: #fff; font-weight: 500; }
.footer-grid button, .footer-grid a { display: block; padding: 4px 0; color: #aebbb8; text-align: left; }
.footer-grid button:hover, .footer-grid a:hover { color: #fff; }
.footer-bottom { min-height: 54px; display: flex; align-items: center; justify-content: space-between; gap: 24px; color: #92a29e; font-size: 12px; border-top: 1px solid #394440; }
.toast { position: fixed; right: 22px; bottom: 22px; z-index: 80; max-width: 360px; padding: 12px 16px; color: #fff; background: var(--ink); opacity: 0; transform: translateY(12px); pointer-events: none; transition: .2s ease; box-shadow: 0 8px 24px rgba(0,0,0,.2); }
.toast.show { opacity: 1; transform: translateY(0); }

@media (max-width: 1180px) {
  .shell { width: min(calc(100% - 32px), var(--shell)); }
  .main-nav { grid-template-columns: 210px 140px minmax(300px, 1fr); }
  .main-nav::after { display: none; }
  .category-cards { grid-template-columns: repeat(3, 1fr); }
  .brand-grid { grid-template-columns: repeat(4, 1fr); }
  .asset-slots { grid-template-columns: repeat(3, 1fr); }
  .product-results.grid-mode { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .utility-bar { display: none; }
  .site-header { top: 0; }
  .main-nav { min-height: 64px; grid-template-columns: 1fr 44px; gap: 10px; padding: 10px 0; }
  .category-trigger { display: none; }
  .global-search { grid-column: 1 / -1; grid-row: 2; }
  .mobile-menu { display: flex; }
  .category-panel { top: 128px; max-height: calc(100vh - 128px); overflow: auto; }
  .category-panel-grid { grid-template-columns: repeat(2, 1fr); }
  .home-grid { grid-template-columns: 1fr; }
  .category-rail { display: none; }
  .home-main .selection-intro { margin-left: 0; }
  .selection-intro { grid-template-columns: 1fr; }
  .selection-copy { padding: 32px; }
  .hero-placeholder { min-height: 260px; border-left: 0; border-top: 1px solid var(--line); }
  .metrics-strip { grid-template-columns: repeat(2, 1fr); }
  .category-cards { grid-template-columns: repeat(2, 1fr); }
  .catalog-layout { grid-template-columns: 1fr; }
  .filters { display: grid; grid-template-columns: repeat(2, 1fr); }
  .filter-title { grid-column: 1 / -1; }
  .catalog-heading { grid-template-columns: 1fr 260px; }
  .subcategories { grid-template-columns: repeat(3, 1fr); }
  .result-card { grid-template-columns: 125px minmax(0, 1fr); }
  .result-action { grid-column: 1 / -1; flex-direction: row; align-items: center; justify-content: space-between; gap: 16px; border-left: 0; border-top: 1px solid var(--line); }
  .result-action strong { margin: 0; }
  .primary-action { width: 200px; }
  .product-layout { grid-template-columns: 1fr; }
  .main-product-image { min-height: 0; }
  .product-summary { padding: 8px 0; }
  .product-tabs { top: 128px; overflow-x: auto; }
  .product-tabs button { flex: 0 0 130px; }
}

@media (max-width: 620px) {
  .shell { width: 100%; padding-left: 14px; padding-right: 14px; }
  .main-nav { padding-top: 8px; padding-bottom: 8px; }
  .brand strong { font-size: 15px; }
  .brand small { font-size: 10px; }
  .global-search { grid-template-columns: 1fr 48px; }
  .global-search button span { display: none; }
  .category-panel-grid { grid-template-columns: 1fr; padding: 0; }
  .selection-intro { min-height: 0; overflow: visible; }
  .selection-copy { padding: 28px 20px; }
  h1 { font-size: 30px; }
  h2 { font-size: 22px; }
  .hero-placeholder { min-height: 230px; }
  .metrics-strip div { min-height: 82px; padding: 12px 16px; }
  .content-section { padding: 30px 14px; }
  .section-heading { align-items: flex-start; }
  .section-note { display: none; }
  .category-cards, .brand-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .category-card { min-height: 158px; padding: 15px; }
  .category-card p { padding-right: 20px; }
  .category-card > svg { right: 12px; bottom: 15px; }
  .brand-tile { min-width: 0; }
  .asset-slots { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .asset-slot { min-height: 150px; padding: 16px 10px 28px; }
  .asset-slot:last-child { grid-column: 1 / -1; }
  .asset-slot span { max-width: 145px; }
  .asset-slot:last-child span { max-width: 290px; }
  .breadcrumbs { white-space: nowrap; overflow-x: auto; }
  .catalog-heading { grid-template-columns: 1fr; }
  .catalog-heading > div:first-child { padding: 26px 18px; }
  .catalog-visual { min-height: 180px; border-left: 0; border-top: 1px solid var(--line); }
  .subcategories { grid-template-columns: repeat(2, 1fr); }
  .subcategory:last-child:nth-child(odd) { grid-column: 1 / -1; }
  .mobile-filter-toggle { min-height: 48px; display: flex; align-items: center; justify-content: center; gap: 8px; margin: 14px 0 8px; color: var(--brand-dark); background: var(--surface); border: 1px solid var(--line-strong); }
  .mobile-filter-toggle[aria-expanded="true"] { color: #fff; background: var(--brand); border-color: var(--brand); }
  .filters { display: none; grid-template-columns: 1fr; margin: 0 -14px 12px; border-left: 0; border-right: 0; }
  .filters.mobile-open { display: grid; }
  .check-row { min-height: 44px; gap: 12px; }
  .check-row input { width: 20px; height: 20px; }
  .results-toolbar { align-items: flex-start; }
  .toolbar-actions label, .toolbar-actions select { display: none; }
  .segmented button { width: 44px; height: 42px; }
  .result-card, .product-results.grid-mode .result-card { display: grid; grid-template-columns: 112px minmax(0, 1fr); }
  .result-image, .grid-mode .result-image { min-height: 148px; padding: 10px; border-right: 1px solid var(--line); border-bottom: 0; }
  .result-info { padding: 14px 12px; }
  .result-info h3 { font-size: 15px; }
  .result-params { grid-template-columns: repeat(3, 1fr); }
  .result-action { grid-column: 1 / -1; flex-wrap: wrap; padding: 12px; }
  .primary-action { width: 100%; }
  .product-results.grid-mode { display: block; }
  .product-results.grid-mode .result-card { margin-bottom: 8px; }
  .product-layout { padding: 14px; margin: 0 -14px; border-left: 0; border-right: 0; }
  .main-product-image { min-height: auto; }
  .thumbnail-row { gap: 4px; }
  .thumbnail { min-height: 54px; padding: 4px; }
  .thumbnail span { font-size: 9px; }
  .product-summary h1 { font-size: 25px; }
  .price-panel { grid-template-columns: 1fr; }
  .price-panel > span { grid-row: auto; }
  .spec-row { grid-template-columns: 1fr; gap: 8px; padding: 12px 0; }
  .model-line button { width: 44px; height: 44px; }
  .spec-option { min-width: 64px; height: 44px; }
  .contact-panel > div:first-child { display: block; }
  .contact-panel small { display: block; margin-top: 5px; }
  .sales-list { grid-template-columns: 1fr; }
  .sales-person { grid-template-columns: 40px 1fr 44px; }
  .sales-person button { width: 44px; height: 44px; }
  .product-tabs { margin-left: -14px; margin-right: -14px; }
  .tab-content { padding: 14px; margin-left: -14px; margin-right: -14px; }
  .parameter-table { display: block; font-size: 12px; }
  .parameter-table tbody { display: block; }
  .parameter-table tr { display: grid; grid-template-columns: minmax(92px, .8fr) minmax(0, 1.2fr); }
  .parameter-table th, .parameter-table td { width: auto; min-width: 0; padding: 10px 8px; overflow-wrap: anywhere; }
  .feature-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; padding: 32px 14px; }
  .footer-bottom { align-items: flex-start; flex-direction: column; padding-top: 16px; padding-bottom: 16px; }
}