.catalog-page { background: #f4f7f8; }
.catalog-hero { padding: 142px 0 68px; color: #fff; background: linear-gradient(125deg, #0b1e2c, #17394d); }
.catalog-hero h1 { max-width: 980px; font-size: clamp(40px, 5.5vw, 72px); }
.catalog-hero > .container > p:last-child { max-width: 760px; margin: 24px 0 0; color: rgba(255,255,255,.74); font-size: 19px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 34px; color: rgba(255,255,255,.62); font-size: 13px; }
.breadcrumbs a { text-underline-offset: 3px; }
.catalog-tabs { display: flex; gap: 8px; margin: 28px 0 0; padding: 8px; overflow-x: auto; background: #fff; border: 1px solid var(--line); }
.catalog-tabs a { flex: 0 0 auto; padding: 11px 15px; color: var(--steel); text-decoration: none; font-size: 14px; font-weight: 750; }
.catalog-tabs a:hover, .catalog-tabs a.active { color: #fff; background: var(--ink-2); }
.catalog-content { padding: 58px 0 92px; }
.catalog-content h2 { margin: 46px 0 18px; font-size: clamp(28px, 3.4vw, 42px); line-height: 1.1; letter-spacing: -.025em; }
.catalog-content .lead { margin-top: 0; color: var(--ink); font-size: 23px; line-height: 1.45; }
.catalog-content p { color: var(--steel); }
.catalog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.catalog-card { display: block; min-height: 310px; padding: 34px; color: var(--ink); background: #fff; border: 1px solid var(--line); text-decoration: none; transition: transform .2s, border-color .2s, box-shadow .2s; }
.catalog-card:hover { transform: translateY(-4px); border-color: var(--cyan); box-shadow: 0 18px 38px rgba(20,40,55,.1); }
.catalog-card > span { color: var(--cyan); font-size: 12px; font-weight: 800; letter-spacing: .15em; }
.catalog-card h2 { margin: 50px 0 14px; font-size: 27px; }
.catalog-card p { min-height: 76px; }
.catalog-card b { color: var(--orange); font-size: 14px; }
.split-layout { display: grid; grid-template-columns: 1fr .9fr; gap: 56px; align-items: start; }
.split-layout.intro { align-items: center; margin-bottom: 44px; }
.technical-figure, .exploded { margin: 0; padding: 18px; background: #fff; border: 1px solid var(--line); }
.technical-figure img { width: 100%; max-height: 470px; object-fit: contain; }
.technical-figure.compact img { max-height: 400px; }
.technical-figure figcaption, .exploded figcaption { margin-top: 12px; color: var(--steel); font-size: 13px; }
.diagram-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 38px; }
.diagram-pair a { padding: 10px; background: #fff; border: 1px solid var(--line); }
.diagram-pair img { width: 100%; height: 300px; object-fit: contain; }
.action-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button-outline { color: var(--ink); border: 1px solid var(--ink); }
.table-scroll { width: 100%; margin: 22px 0 38px; overflow-x: auto; background: #fff; border: 1px solid var(--line); box-shadow: 0 10px 28px rgba(20,40,55,.04); }
.table-scroll:focus { outline: 3px solid rgba(19,169,211,.28); outline-offset: 2px; }
.table-scroll table { width: 100%; min-width: 820px; border-collapse: collapse; font-size: 14px; }
.table-scroll th, .table-scroll td { padding: 13px 14px; text-align: left; vertical-align: top; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.table-scroll th { position: sticky; top: 0; color: #fff; background: var(--ink-2); font-size: 12px; letter-spacing: .02em; }
.table-scroll tr:nth-child(even) td { background: #f7f9fa; }
.table-scroll td:first-child { font-weight: 750; white-space: nowrap; }
.table-scroll td[colspan] { color: var(--steel); font-size: 12px; font-weight: 500; white-space: normal; }
.table-note { margin: -18px 0 0; font-size: 13px; }
.exploded { margin-bottom: 36px; }
.exploded img { width: 100%; max-height: 720px; object-fit: contain; }
.exploded.injector { width: min(100%, 430px); }
.exploded.injector img { max-height: 480px; }
.detail-layout { display: grid; grid-template-columns: minmax(280px, .7fr) 1.3fr; gap: 48px; align-items: center; }
.detail-layout h2 { margin-top: 0; }
.notice { margin-bottom: 32px; padding: 20px 24px; border-left: 5px solid var(--orange); background: #fff; }
.notice p { margin: 6px 0 0; }
.prose { max-width: 860px; }
.prose p { font-size: 18px; line-height: 1.72; }
.spec-list { margin: 26px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.spec-list li { display: grid; grid-template-columns: .75fr 1.25fr; gap: 18px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.spec-list span { color: var(--steel); }
.zip-image { width: 100%; max-height: 360px; padding: 20px; object-fit: contain; background: #fff; border: 1px solid var(--line); }

@media (max-width: 900px) {
  .catalog-grid { grid-template-columns: 1fr; }
  .catalog-card { min-height: auto; }
  .catalog-card h2 { margin-top: 28px; }
  .catalog-card p { min-height: 0; }
  .split-layout, .detail-layout { grid-template-columns: 1fr; }
  .diagram-pair { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .catalog-hero { padding: 118px 0 48px; }
  .catalog-hero h1 { font-size: 40px; }
  .catalog-content { padding: 42px 0 68px; }
  .catalog-tabs { width: calc(100% + 14px); }
  .catalog-card { padding: 26px; }
  .diagram-pair img { height: 210px; }
  .spec-list li { grid-template-columns: 1fr; gap: 3px; }
  .action-row { display: grid; }
}