/* OUCO v3 — widescreen editorial line system */
body[data-page] { --shell: 1580px; }

.page-hero { min-height: 600px; }
.page-hero-compact { min-height: 470px; }
.page-hero h1 { max-width: 900px; font-size: clamp(54px, 5.15vw, 82px); }
.breadcrumbs { font-size: 13px; color: rgba(255,255,255,.72); }
.breadcrumbs strong { color: var(--white); }
.inner-heading { max-width: 1120px; }
.inner-heading-centered { margin-inline: 0; text-align: left; }
.inner-heading-centered > p { margin-inline: 0; }

/* Full-width editorial rows replace floating cards. */
.system-index,
.subcategory-section,
.application-detail-section,
.service-grid-section,
.resource-library,
.about-pillars { background: var(--white); }

.system-rows { gap: 0; border-top: 1px solid var(--border); }
.system-row,
.system-row:nth-child(even) {
  min-height: 470px;
  grid-template-columns: 1.02fr .98fr;
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}
.system-row:hover { border-color: var(--border); box-shadow: none; transform: none; }
.system-row-media { min-height: 470px; }
.system-row-copy { padding: clamp(56px, 5vw, 92px); }
.system-row-copy h2 { font-size: clamp(40px, 3.5vw, 58px); }
.selection-panel { border-top: 1px solid var(--border); background: var(--surface); }
.selection-list li { display: block; }

.category-intro-grid { align-items: start; }
.parameter-panel {
  padding: 0;
  border-top: 1px solid var(--navy);
  border-bottom: 1px solid var(--border);
  background: transparent;
}
.parameter-panel > p { margin: 0; padding: 20px 0; border-bottom: 1px solid var(--border); }
.parameter-panel ul { margin: 0; padding: 0; list-style: none; }
.parameter-panel li { display: block; padding: 17px 0; }

.subcategory-grid { display: block; border-top: 1px solid var(--navy); }
.subcategory-card {
  display: block;
  overflow: visible;
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}
.subcategory-card:hover { box-shadow: none; transform: none; }
.subcategory-copy {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(220px, .85fr) minmax(300px, 1.25fr) auto;
  align-items: start;
  gap: clamp(28px, 4vw, 68px);
  padding: 34px 0;
}
.subcategory-copy h3 { margin: 0; font-size: clamp(25px, 2vw, 34px); }
.subcategory-copy p { margin: 2px 0 0; font-size: 17px; }
.subcategory-copy a { justify-self: end; margin-top: 4px; white-space: nowrap; }

.related-links { display: block; border-top: 1px solid var(--navy); }
.related-links a,
.related-links a:first-child {
  min-height: 100px;
  grid-template-columns: 1fr 28px;
  padding: 26px 0;
  border: 0;
  border-bottom: 1px solid var(--border);
}
.related-links a:hover { color: var(--navy); background: transparent; }
.related-links a:hover strong { color: var(--blue); }
.related-links strong { font-size: clamp(22px, 2vw, 31px); }

.sector-detail-grid { display: block; border-top: 1px solid var(--navy); }
.sector-detail {
  position: relative;
  min-height: 390px;
  display: grid;
  grid-template-columns: .42fr .58fr;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  color: var(--navy);
  background: var(--white);
}
.sector-detail::after { display: none; }
.sector-detail > img { position: static; min-height: 390px; height: 100%; object-fit: cover; }
.sector-detail > div { position: static; padding: clamp(48px, 5vw, 84px); }
.sector-detail:nth-child(even) > img { order: 2; }
.sector-detail:nth-child(even) > div { order: 1; }
.sector-detail h2 { margin-top: 0; color: var(--navy); font-size: clamp(36px, 3.4vw, 56px); }
.sector-detail p { color: #5b7181; font-size: 17px; }
.sector-detail a { color: var(--blue); }
.sector-detail:hover > img { transform: none; }

.quality-story-media { border-radius: 0; }
.service-grid { display: block; border: 0; border-top: 1px solid var(--navy); }
.service-card {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(260px, .82fr) minmax(360px, 1.18fr);
  gap: 42px;
  padding: 34px 0;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: transparent;
}
.service-card:hover { color: inherit; background: transparent; }
.service-card h3 { margin: 0; font-size: clamp(24px, 2vw, 32px); }
.service-card:hover h3 { color: var(--navy); }
.service-card p,
.service-card:hover p { margin: 2px 0 0; color: #607687; font-size: 17px; }

.library-grid { display: block; border-top: 1px solid var(--navy); }
.library-card {
  min-height: 0;
  display: grid;
  grid-template-columns: 54px minmax(220px, .7fr) minmax(340px, 1.15fr) 180px;
  align-items: center;
  gap: 28px;
  padding: 30px 0;
  overflow: visible;
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  background: transparent;
}
.library-card::after { display: none; }
.library-card:hover { color: inherit; background: transparent; transform: none; }
.library-card > svg { width: 40px; height: 40px; margin: 0; }
.library-card h3 { margin: 0; font-size: clamp(22px, 1.9vw, 30px); }
.library-card:hover h3 { color: var(--navy); }
.library-card p,
.library-card:hover p { margin: 0; color: #607687; font-size: 16px; }
.library-card a,
.library-card:hover a { justify-self: end; margin: 0; color: var(--blue); white-space: nowrap; }

.pillar-grid { display: block; border: 0; border-top: 1px solid var(--navy); }
.pillar-grid article {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(260px, .8fr) minmax(360px, 1.2fr);
  gap: 42px;
  padding: 35px 0;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: transparent;
}
.pillar-grid h3 { margin: 0; font-size: clamp(24px, 2vw, 32px); }
.pillar-grid p { margin: 2px 0 0; font-size: 17px; }

.contact-main { background: var(--white); }
.inner-form {
  padding: 34px 0 0;
  border-top: 1px solid var(--navy);
  background: transparent;
  box-shadow: none;
}
.inner-form input,
.inner-form select,
.inner-form textarea {
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  background: transparent;
}
.inner-form input:focus,
.inner-form select:focus,
.inner-form textarea:focus { border-color: var(--blue); box-shadow: none; }
.form-status-note { display: block; margin-top: 24px; color: var(--steel); font-size: 12px; }
.contact-steps { display: block; border: 0; border-top: 1px solid var(--navy); }
.contact-steps li {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(260px, .8fr) minmax(360px, 1.2fr);
  gap: 42px;
  padding: 30px 0;
  border: 0;
  border-bottom: 1px solid var(--border);
}
.contact-steps strong { margin: 0; font-size: clamp(24px, 2vw, 32px); }
.contact-steps p { margin: 2px 0 0; font-size: 17px; }

/* Technical and process lists use open rules, never visible folio numbering. */
.flow-line { display: block; overflow: visible; padding: 0; border-top: 1px solid var(--navy); }
.flow-line::before { display: none; }
.flow-line li { display: grid; grid-template-columns: minmax(260px,.8fr) minmax(360px,1.2fr); gap: 42px; align-items: start; padding: 25px 0; border-bottom: 1px solid var(--border); text-align: left; }
.flow-line strong { font-size: clamp(23px,1.8vw,29px); }
.flow-line small { color: var(--steel); font-size: 16px; }
.guide-links a { grid-template-columns: 1fr 24px; }

.product-detail-main { border-bottom: 1px solid var(--border); }
.detail-image { border: 0; background: transparent; }
.detail-image img { padding: 0; }
.detail-thumbs { border-top: 1px solid var(--border); }
.detail-thumbs button { border: 0; border-bottom: 2px solid transparent; background: transparent; }
.detail-thumbs button.is-active { border-color: var(--blue); }
.detail-product-title { margin-bottom: 20px; color: var(--navy); font-size: clamp(42px, 4vw, 62px); }
.detail-information { border-top: 1px solid var(--border); background: var(--white); }
.parameter-note { padding: 18px 0 18px 20px; background: transparent; }

@media (max-width: 1080px) {
  .subcategory-copy { grid-template-columns: minmax(230px, .8fr) minmax(280px, 1.2fr) 165px; gap: 28px; }
  .service-card,
  .pillar-grid article,
  .contact-steps li { grid-template-columns: minmax(210px, .8fr) minmax(280px, 1.2fr); gap: 28px; }
  .library-card { grid-template-columns: 48px minmax(190px, .75fr) minmax(260px, 1.25fr) 150px; gap: 20px; }
}

@media (max-width: 820px) {
  .page-hero { min-height: 690px; }
  .page-hero-compact { min-height: 610px; }
  .breadcrumbs { font-size: 11px; }
  .inner-heading-centered { text-align: left; }
  .system-row,
  .system-row:nth-child(even) { grid-template-columns: 1fr; }
  .system-row:nth-child(even) .system-row-media { order: 0; }
  .system-row-media { min-height: 330px; }
  .subcategory-copy { grid-template-columns: 1fr; gap: 13px; padding: 28px 0 30px; }
  .subcategory-copy a { justify-self: start; margin-top: 5px; }
  .sector-detail { grid-template-columns: 1fr; }
  .sector-detail > img,
  .sector-detail:nth-child(even) > img { order: 0; min-height: 300px; height: 300px; }
  .sector-detail > div,
  .sector-detail:nth-child(even) > div { order: 1; padding: 42px 0 54px; }
  .service-card,
  .pillar-grid article,
  .contact-steps li { grid-template-columns: 1fr; gap: 10px; }
  .service-card p,
  .pillar-grid p { grid-column: 1; }
  .library-card { grid-template-columns: 48px 1fr; gap: 12px 18px; }
  .library-card h3 { grid-column: 2; }
  .library-card p { grid-column: 2; }
  .library-card a { grid-column: 2; justify-self: start; }
  .contact-steps li { min-height: 0; padding-right: 0; }
  .flow-line li { grid-template-columns: 1fr; gap: 6px; }
}

@media (max-width: 560px) {
  .page-hero { min-height: 650px; }
  .page-hero-compact { min-height: 590px; }
  .page-hero h1 { font-size: 44px; }
  .system-index,
  .category-intro,
  .subcategory-section,
  .related-systems,
  .application-detail-section,
  .application-method,
  .quality-story,
  .service-grid-section,
  .quality-flow,
  .resource-library,
  .resource-guide,
  .about-position,
  .about-pillars,
  .contact-main,
  .contact-process,
  .product-detail-main,
  .detail-information { padding-top: 80px; padding-bottom: 84px; }
  .system-row-media { min-height: 255px; }
  .system-row-copy { padding: 36px 0 46px; }
  .subcategory-copy h3 { font-size: 25px; }
  .related-links a,
  .related-links a:first-child { grid-template-columns: 1fr 22px; }
  .service-card,
  .pillar-grid article { grid-template-columns: 1fr; padding: 28px 0; }
  .library-card { grid-template-columns: 40px 1fr; padding: 26px 0; }
  .library-card > svg { width: 34px; height: 34px; }
  .inner-form { padding: 28px 0 0; }
  .detail-product-title { font-size: 40px; }
}

/* Original OUCO transformer-material applications, kept distinct from projects. */
.transformer-material-app { padding: 120px 0 128px; background: var(--surface); scroll-margin-top: 90px; }
.transformer-material-feature { display: grid; grid-template-columns: minmax(0, .96fr) minmax(0, 1.04fr); align-items: stretch; border-bottom: 1px solid var(--border); }
.transformer-material-photo { position: relative; min-height: 490px; margin: 0; overflow: hidden; background: #cbd6e8; }
.transformer-material-photo img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.transformer-material-intro { display: flex; align-items: flex-start; flex-direction: column; justify-content: center; padding: 48px 0 64px clamp(55px, 7vw, 120px); }
.transformer-material-intro h2 { max-width: 770px; margin-bottom: 23px; color: var(--navy); font-size: clamp(40px, 4vw, 65px); }
.transformer-material-intro > p:not(.eyebrow) { max-width: 650px; margin-bottom: 0; color: #546d7f; font-size: 18px; line-height: 1.65; }
.transformer-material-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 14px; margin-top: 32px; }
.transformer-material-actions .button { min-height: 48px; padding-inline: 22px; }
.transformer-material-heading { display: grid; grid-template-columns: minmax(0, 1fr) minmax(250px, .45fr); align-items: end; gap: 50px; margin: 68px 0 28px; }
.transformer-material-heading .eyebrow { grid-column: 1 / -1; margin: 0; }
.transformer-material-heading h3 { margin: 0; color: var(--navy); font-size: clamp(34px, 3vw, 49px); }
.transformer-material-heading > p:last-child { margin: 0 0 5px; color: #61798a; font-size: 16px; }
.transformer-material-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 clamp(38px, 5vw, 90px); border-top: 1px solid var(--navy); }
.transformer-material-row { padding: 34px 12px 41px 0; border-bottom: 1px solid var(--border); }
.transformer-material-row h3 { margin-bottom: 13px; color: var(--navy); font-size: clamp(25px, 2vw, 32px); }
.transformer-material-row p { max-width: 600px; margin-bottom: 18px; color: #547083; font-size: 16px; }
.transformer-material-row ul { margin: 0; padding: 0; border-top: 1px solid var(--border); list-style: none; }
.transformer-material-row li { display: grid; grid-template-columns: minmax(125px, .48fr) minmax(0, 1fr); gap: 20px; padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 14px; line-height: 1.4; }
.transformer-material-row li strong { color: var(--navy); font-family: var(--display); font-size: 13px; line-height: 1.4; }
.transformer-material-row li span { color: #5c7485; }
.transformer-material-note { max-width: 920px; margin: 24px 0 0; color: #61798a; font-size: 14px; }

@media (max-width: 900px) {
  .transformer-material-feature { grid-template-columns: 1fr; }
  .transformer-material-photo { min-height: 390px; }
  .transformer-material-intro { padding: 42px 0 55px; }
  .transformer-material-heading { grid-template-columns: 1fr; gap: 12px; }
  .transformer-material-heading .eyebrow { grid-column: 1; }
}

@media (max-width: 680px) {
  .transformer-material-app { padding: 80px 0 88px; }
  .transformer-material-photo { min-height: 275px; }
  .transformer-material-intro h2 { font-size: clamp(35px, 8vw, 46px); }
  .transformer-material-intro > p:not(.eyebrow) { font-size: 16px; }
  .transformer-material-actions { flex-direction: column; align-items: stretch; }
  .transformer-material-actions .button { width: 100%; }
  .transformer-material-heading { margin-top: 53px; }
  .transformer-material-grid { grid-template-columns: 1fr; }
  .transformer-material-row { padding: 27px 0 32px; }
  .transformer-material-row h3 { font-size: 25px; }
  .transformer-material-row p { font-size: 15px; }
  .transformer-material-row li { grid-template-columns: 1fr; gap: 3px; }
}