.underlay-guide .underlay-hero { isolation: isolate; background: #08264c; }
/* The article owns its back-to-top control; hide the duplicate footer widget. */
.underlay-guide #backToTop { display: none; }
.underlay-guide .underlay-hero::after { background: linear-gradient(90deg, rgba(0, 19, 43, .9), rgba(0, 19, 43, .58)); opacity: 1; z-index: -1; }
.underlay-guide .underlay-hero__image { position: absolute; inset: 0; z-index: -2; }
.underlay-guide .underlay-hero__image picture, .underlay-guide .underlay-hero__image img { width: 100%; height: 100%; display: block; }
.underlay-guide .underlay-hero__image img { object-fit: cover; object-position: center 65%; }
.underlay-guide .underlay-hero .container { position: relative; }
.underlay-guide .underlay-hero h1, .underlay-guide .underlay-hero p { color: #fff; text-shadow: 0 2px 12px rgba(0, 0, 0, .3); }
.underlay-guide .underlay-hero h1 { background: none; -webkit-text-fill-color: #fff; }
.underlay-guide .article-section { padding: 28px 0; margin-bottom: 32px; scroll-margin-top: 155px; }
.underlay-guide .article-key-points { margin-top: 30px; }
.underlay-guide .table-of-contents li { margin: 0; padding: 0; line-height: 1.4; }
.underlay-guide .table-of-contents a { min-height: 44px; padding: 8px 0; font-size: .95rem; }
.underlay-guide .table-of-contents a.is-active { color: #16723d; border-bottom-color: #16723d; }
.underlay-guide .article-content li { overflow-wrap: break-word; }
.underlay-guide .warning-note { padding: clamp(18px, 3vw, 28px); margin: 28px 0; border-left: 5px solid #d39424; border-radius: 10px; background: #fff9ef; }
.underlay-guide .warning-note h3 { margin-top: 0; font-size: 1.25rem; }
.underlay-guide .article-visual { margin: 28px 0; border: 1px solid #dce4ed; border-radius: 16px; overflow: hidden; }
.underlay-guide .article-visual picture { display: block; }
.underlay-guide .article-visual img { display: block; width: 100%; height: auto; }
.underlay-guide .article-visual__caption { padding: 16px 20px; font-size: .95rem; line-height: 1.6; }
.underlay-guide .underlay-table { table-layout: fixed; margin-bottom: 26px; }
.underlay-guide .underlay-table td, .underlay-guide .underlay-table th { text-align: left; overflow-wrap: anywhere; vertical-align: top; }
.underlay-guide .underlay-table th:first-child { width: 20%; }
.underlay-guide .underlay-systems { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin: 30px 0 18px; }
.underlay-guide .underlay-system { display: flex; flex-direction: column; min-width: 0; padding: 20px 16px; border: 1px solid #d6e0ec; border-radius: 18px; background: #fff; box-shadow: 0 8px 24px rgba(8, 38, 76, .045); }
.underlay-guide .underlay-system__heading { display: flex; align-items: flex-start; gap: 12px; }
.underlay-guide .underlay-system__heading > span { flex-shrink: 0; display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: #08264c; color: #c1ea62; font-size: .8rem; font-weight: 700; }
.underlay-guide .underlay-system h3 { margin: 1px 0 0; min-height: 56px; font-size: 1.12rem; line-height: 1.4; color: #08264c; }
.underlay-guide .underlay-system__visual { margin: 18px 0 16px; height: 182px; overflow: hidden; border-radius: 12px; background: #faf9f7; }
.underlay-guide .underlay-system__visual picture, .underlay-guide .underlay-system__visual img { display: block; width: 100%; height: 100%; }
.underlay-guide .underlay-system__visual img { object-fit: contain; }
.underlay-guide .underlay-layer-list { list-style: none; padding: 0; margin: 0 0 20px; }
.underlay-guide .underlay-layer-list > li.underlay-layer { display: flex; align-items: center; gap: 10px; min-height: 52px; padding: 10px 0; margin: 0; border-bottom: 1px solid #edf1f6; color: #31475f; font-size: .95rem; line-height: 1.5; }
.underlay-guide .underlay-layer-list strong { color: inherit; font-weight: 500; }
.underlay-guide .underlay-layer__number { display: grid; place-items: center; flex-shrink: 0; width: 24px; height: 24px; border: 1px solid #d3deea; border-radius: 50%; color: #526a83; font-size: .8rem; }
.underlay-guide .underlay-system__result { margin-top: auto; padding: 15px; border-top: 3px solid #94c11f; border-radius: 10px; background: #08264c; }
.underlay-guide .underlay-system__result > span { display: block; margin-bottom: 6px; color: #c1ea62; font-size: .85rem; line-height: 1.4; }
.underlay-guide .underlay-system__result > strong { display: block; color: #fff; font-size: 1rem; line-height: 1.5; }
.underlay-guide .underlay-system > p { margin: 15px 0 0; font-size: .95rem; line-height: 1.65; }
.underlay-guide .underlay-diagram-note { margin: 0 0 28px; font-size: .95rem; line-height: 1.6; }
.underlay-guide .underlay-soft-cta, .underlay-guide .underlay-calculation { padding: clamp(20px, 3vw, 30px); border-radius: 16px; background: #08264c; border-top: 4px solid #94c11f; margin: 30px 0; color: #fff; }
.underlay-guide .underlay-soft-cta h3, .underlay-guide .underlay-soft-cta p, .underlay-guide .underlay-calculation h3, .underlay-guide .underlay-calculation p { color: #fff; }
.underlay-guide .underlay-calculation strong { color: #c1ea62; }
.underlay-guide .underlay-acoustic-cards, .underlay-guide .underlay-decisions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin: 26px 0; }
.underlay-guide .underlay-acoustic-cards > div, .underlay-guide .underlay-decisions > div { min-width: 0; padding: 24px; border: 1px solid #dce4ed; border-radius: 14px; background: #f5f8fc; }
.underlay-guide .underlay-acoustic-cards svg { display: block; width: 48px; height: 48px; margin-bottom: 18px; color: #08264c; }
.underlay-guide .underlay-acoustic-cards h3, .underlay-guide .underlay-decisions h3 { margin: 0 0 14px; font-size: 1.25rem; line-height: 1.45; color: #08264c; }
.underlay-guide .underlay-label { display: block; margin-bottom: 12px; color: #08264c; font-size: .9rem; font-weight: 700; letter-spacing: .02em; }
.underlay-guide .underlay-text-image { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 24px; align-items: start; margin: 30px 0; }
.underlay-guide .underlay-text-image > div, .underlay-guide .underlay-text-image > figure { min-width: 0; }
.underlay-guide .underlay-text-image h3 { margin-top: 0; font-size: 1.25rem; }
.underlay-guide .underlay-text-image figure { margin: 0; border: 1px solid #dce4ed; border-radius: 14px; overflow: hidden; }
.underlay-guide .underlay-text-image picture, .underlay-guide .underlay-text-image img { display: block; width: 100%; }
.underlay-guide .underlay-text-image img { height: auto; }
.underlay-guide .underlay-text-image figcaption { padding: 14px; font-size: .88rem; line-height: 1.55; color: #45576b; }
.underlay-guide .underlay-workflow { list-style: none; padding: 0; margin: 26px 0; }
.underlay-guide .underlay-workflow > li { display: grid; grid-template-columns: 44px minmax(0, 1fr); gap: 18px; position: relative; padding: 22px; margin: 0 0 18px; border: 1px solid #dce4ed; border-radius: 14px; background: #f5f8fc; }
.underlay-guide .underlay-workflow > li:not(:last-child)::after { content: ''; position: absolute; left: 43px; bottom: -19px; width: 2px; height: 18px; background: #8da4bd; }
.underlay-guide .underlay-workflow__number { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; background: #08264c; color: #fff; font-weight: 700; font-size: 1.25rem; }
.underlay-guide .underlay-workflow h3 { margin: 0 0 8px; font-size: 1.2rem; line-height: 1.35; color: #08264c; }
.underlay-guide .underlay-workflow p { margin: 0; font-size: 1rem; line-height: 1.7; }
.underlay-guide .underlay-shortcuts { display: flex; flex-wrap: wrap; gap: 10px; margin: 24px 0 30px; }
.underlay-guide .underlay-shortcuts > span { flex-basis: 100%; color: #45566b; font-size: .95rem; }
.underlay-guide .underlay-shortcuts a { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 46px; padding: 10px 15px; border: 1px solid #cdd8e5; border-radius: 10px; background: #f3f7fb; color: #08264c; font-size: .95rem; font-weight: 600; text-decoration: none; }
.underlay-guide .underlay-shortcuts a:hover { background: #e7eff8; border-color: #08264c; }
.underlay-guide .underlay-shortcuts a:focus-visible { outline: 3px solid #16723d; outline-offset: 3px; }
.underlay-guide .underlay-thermal, .underlay-guide .underlay-moisture { margin: 30px 0; overflow: hidden; border: 1px solid #cdd8e5; border-radius: 16px; background: #f3f7fb; }
.underlay-guide .underlay-explainer-heading { padding: 22px 24px; background: #08264c; border-top: 4px solid #94c11f; }
.underlay-guide .underlay-explainer-heading .underlay-label { margin-bottom: 9px; color: #c1ea62; }
.underlay-guide .underlay-explainer-heading h3 { margin: 0; color: #fff; font-size: 1.3rem; line-height: 1.4; }
.underlay-guide .underlay-explainer-heading p { margin: 12px 0 0; color: #fff; font-size: 1rem; line-height: 1.65; }
.underlay-guide .underlay-thermal__rows, .underlay-guide .underlay-moisture__cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; padding: 20px; }
.underlay-guide .underlay-thermal__row, .underlay-guide .underlay-moisture__cards > div { min-width: 0; padding: 20px; border: 1px solid #dce4ed; border-radius: 12px; background: #fff; }
.underlay-guide .underlay-thermal__row h4, .underlay-guide .underlay-moisture__cards h4 { margin: 0 0 16px; color: #08264c; font-size: 1.12rem; line-height: 1.45; }
.underlay-guide .underlay-thermal__row p, .underlay-guide .underlay-moisture__cards p { margin: 16px 0 0; font-size: 1rem; line-height: 1.65; }
.underlay-guide .underlay-equation { display: grid; grid-template-columns: 1fr; gap: 6px; text-align: center; }
.underlay-guide .underlay-equation > span { display: grid; align-items: center; min-height: 52px; padding: 12px; border: 1px solid #cdd8e5; border-radius: 8px; background: #edf3f9; color: #08264c; font-size: 1rem; font-weight: 600; line-height: 1.45; }
.underlay-guide .underlay-equation > b { font-size: 1.5rem; color: #16723d; line-height: 1.2; }
.underlay-guide .underlay-equation--single > span { min-height: 136px; border-color: #b5c89d; background: #f0f6e8; }
.underlay-guide .underlay-moisture__cards svg { display: block; width: 48px; height: 48px; margin-bottom: 18px; color: #08264c; }
.underlay-guide .underlay-moisture__limit { display: block; margin-top: 18px; padding-top: 14px; border-top: 1px solid #dce4ed; color: #805314; font-size: .95rem; font-weight: 600; line-height: 1.5; }
.underlay-guide .underlay-thermal > .underlay-explainer-note, .underlay-guide .underlay-moisture > .underlay-explainer-note { margin: 0; padding: 0 24px 24px; font-size: .95rem; line-height: 1.65; color: #45566b; }
.underlay-guide .underlay-buying-sheet { margin: 30px 0; padding: 24px; border: 1px solid #cdd8e5; border-top: 4px solid #94c11f; border-radius: 14px; background: #f3f7fb; }
.underlay-guide .underlay-buying-sheet h3 { margin: 0 0 20px; color: #08264c; font-size: 1.3rem; line-height: 1.4; }
.underlay-guide .underlay-buying-sheet ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 32px; row-gap: 20px; padding-left: 24px; margin: 0 0 22px; }
.underlay-guide .underlay-buying-sheet li { margin: 0; padding: 0 0 0 4px; min-width: 0; }
.underlay-guide .underlay-buying-sheet li::marker { color: #16723d; font-weight: 700; }
.underlay-guide .underlay-buying-sheet li strong { color: #08264c; }
.underlay-guide .underlay-buying-sheet li p { margin: 8px 0 0; font-size: 1rem; line-height: 1.65; }
.underlay-guide .underlay-buying-sheet > .underlay-explainer-note { margin: 0; padding-top: 18px; border-top: 1px solid #cdd8e5; font-size: .95rem; line-height: 1.65; color: #45566b; }
@media (min-width: 980.01px) {
    .underlay-guide .article-sidebar { max-height: calc(100vh - 160px); }
}
@media (min-width: 768.01px) and (max-width: 980px) {
    .underlay-guide .nav-container { flex-wrap: wrap; justify-content: center; gap: 10px; padding: 0 24px; }
    .underlay-guide .logo { display: block; }
    .underlay-guide .nav-cta { display: none; }
    .underlay-guide .nav-links { flex-basis: 100%; justify-content: center; gap: 24px; }
    .underlay-guide .nav-link { white-space: nowrap; }
    .underlay-guide .dropdown-menu { position: fixed; top: 128px; left: 24px; right: 24px; width: auto; max-width: none; transform: none; }
    .underlay-guide .underlay-hero { padding: 80px 24px 60px; }
    .underlay-guide .underlay-hero h1 { font-size: 2.6rem; }
}
@media (max-width: 1100px) {
    .underlay-guide .underlay-systems { grid-template-columns: 1fr; gap: 24px; }
    .underlay-guide .underlay-system { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); column-gap: 24px; row-gap: 16px; padding: 24px; }
    .underlay-guide .underlay-system__heading { grid-column: 1 / -1; }
    .underlay-guide .underlay-system h3 { min-height: 0; }
    .underlay-guide .underlay-system__visual { grid-column: 1; grid-row: 2 / 4; height: auto; min-height: 210px; margin: 0; }
    .underlay-guide .underlay-layer-list { grid-column: 2; margin: 0; }
    .underlay-guide .underlay-system__result { grid-column: 2; margin: 0; }
    .underlay-guide .underlay-system > p { grid-column: 1 / -1; margin: 0; }
}
@media (max-width: 980px) {
    .underlay-guide main.section { padding: 44px 16px; }
    .underlay-guide .footer-contact-list li { flex-wrap: wrap; overflow-wrap: anywhere; }
    .underlay-guide .article-sidebar .table-of-contents { margin-bottom: 26px; }
}
@media (max-width: 760px) {
    .underlay-guide .underlay-system { display: flex; padding: 20px; gap: 0; }
    .underlay-guide .underlay-system__visual { flex-shrink: 0; height: 210px; min-height: 0; margin: 18px 0 14px; }
    .underlay-guide .underlay-layer-list { margin-bottom: 20px; }
    .underlay-guide .underlay-system > p { margin-top: 15px; }
    .underlay-guide .underlay-shortcuts a { flex-basis: 100%; }
    .underlay-guide .underlay-thermal__rows, .underlay-guide .underlay-moisture__cards { grid-template-columns: 1fr; padding: 16px; }
    .underlay-guide .underlay-explainer-heading { padding: 20px; }
    .underlay-guide .underlay-thermal__row, .underlay-guide .underlay-moisture__cards > div { padding: 18px; }
    .underlay-guide .underlay-equation--single > span { min-height: 80px; }
    .underlay-guide .underlay-thermal > .underlay-explainer-note, .underlay-guide .underlay-moisture > .underlay-explainer-note { padding: 0 20px 20px; }
    .underlay-guide .underlay-buying-sheet { padding: 20px; }
    .underlay-guide .underlay-buying-sheet ol { grid-template-columns: 1fr; }
    .underlay-guide .underlay-table, .underlay-guide .underlay-table tbody, .underlay-guide .underlay-table tr, .underlay-guide .underlay-table th, .underlay-guide .underlay-table td { display: block; width: 100%; }
    .underlay-guide .underlay-table { border: 0; table-layout: auto; background: transparent; overflow: visible; }
    .underlay-guide .underlay-table caption { display: block; width: 100%; border-radius: 12px; text-align: left; padding: 15px; }
    .underlay-guide .underlay-table thead { position: absolute; width: 1px; height: 1px; clip-path: inset(50%); overflow: hidden; }
    .underlay-guide .underlay-table tbody tr { margin-top: 14px; border: 1px solid #dce4ed; border-radius: 12px; overflow: hidden; background: #fff; }
    .underlay-guide .underlay-table tbody th { background: #edf3f9; padding: 14px 16px; width: 100%; }
    .underlay-guide .underlay-table tbody th:first-child { width: 100%; white-space: nowrap; overflow-wrap: normal; }
    .underlay-guide .underlay-table tbody td { padding: 14px 16px; border-top: 1px solid #e7ecf2; font-size: .95rem; }
    .underlay-guide .underlay-table td::before { content: attr(data-label); display: block; font-weight: 700; color: #08264c; margin-bottom: 7px; }
    .underlay-guide .underlay-acoustic-cards, .underlay-guide .underlay-decisions, .underlay-guide .underlay-text-image { grid-template-columns: 1fr; }
    .underlay-guide .underlay-acoustic-cards > div, .underlay-guide .underlay-decisions > div { padding: 20px; }
    .underlay-guide .underlay-soft-cta .btn { width: 100%; white-space: normal; }
    .underlay-guide .underlay-workflow > li { grid-template-columns: 34px minmax(0, 1fr); gap: 12px; padding: 16px; }
    .underlay-guide .underlay-workflow__number { width: 34px; height: 34px; font-size: 1.05rem; }
    .underlay-guide .underlay-workflow > li:not(:last-child)::after { left: 32px; }
    .underlay-guide .article-meta { gap: 14px; margin-bottom: 26px; }
}
@media (prefers-reduced-motion: reduce) { .underlay-guide .reading-progress__bar { transition: none; } }