:root { --ink: #102e47; --navy: #0b3150; --blue: #00a69b; --aqua: #00a69b; --ice: #eaf7f7; --line: #d6e2e6; --pale: #f5f8f8; --amber: #f1a640; --muted: #597082; --white: #fff; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: Poppins, Arial, sans-serif; font-size: 16px; line-height: 1.65; }
a { color: inherit; } a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--amber); outline-offset: 3px; }
.site-header { min-height: 76px; padding: 0 clamp(1.25rem, 5vw, 5.6rem); display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; gap: .65rem; align-items: center; color: var(--navy); font-size: 1.02rem; font-weight: 700; text-decoration: none; letter-spacing: -.025em; }.brand-mark { width: 31px; height: 31px; display: grid; place-items: center; border-radius: 8px; background: var(--navy); color: white; font-size: .68rem; letter-spacing: -.06em; }
.header-action { color: var(--navy); font-size: .88rem; font-weight: 600; text-decoration: none; }.header-action span { color: var(--blue); margin-left: .25rem; }
.hero { min-height: 660px; padding: clamp(2rem, 4vw, 4.5rem) clamp(1.25rem, 5vw, 5.6rem) clamp(4rem, 7vw, 6rem); display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(400px, .98fr); gap: clamp(2.5rem, 6vw, 7rem); background: linear-gradient(115deg, #f8fbfb 0%, #edf7f7 50%, #f9fcfc 100%); overflow: hidden; }
.hero-copy { max-width: 735px; align-self: center; }.eyebrow { margin: 0 0 .55rem; color: var(--blue); font-size: .76rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }.hero h1, h2, h3, p { margin-top: 0; }.hero h1 { max-width: 580px; margin-bottom: 1.05rem; color: var(--navy); font-size: clamp(2.6rem, 5.1vw, 5rem); line-height: 1.06; letter-spacing: -.06em; }.lede { max-width: 675px; margin-bottom: 2rem; color: #35566b; font-size: clamp(1rem, 1.1vw, 1.13rem); }
.quick-tools { display: flex; flex-wrap: wrap; gap: .65rem; }.quick-tool { display: inline-flex; align-items: center; gap: .42rem; padding: .5rem .7rem; border: 1px solid var(--line); border-radius: 99px; color: #527083; background: rgba(255,255,255,.65); font-size: .75rem; font-weight: 600; line-height: 1; }.quick-tool span { color: var(--blue); font-size: .66rem; }.quick-tool.active { border-color: var(--navy); color: white; background: var(--navy); text-decoration: none; }.quick-tool.active span { color: #9ce7e9; }.quick-tool.live { color: var(--navy); background: white; text-decoration: none; }.quick-tool.live:hover { border-color: var(--blue); color: var(--blue); }.quick-tool em { padding-left: .1rem; color: #7e8f9c; font-size: .63rem; font-style: normal; font-weight: 500; }
.trust-line { margin: 1.5rem 0 0; color: #5c7585; font-size: .78rem; font-weight: 500; }.trust-line i { width: 4px; height: 4px; display: inline-block; margin: 0 .52rem 2px; border-radius: 50%; background: var(--aqua); }
.system-wrap { position: relative; align-self: center; padding: 1rem; border: 1px solid #d8e5e7; border-radius: 24px; background: rgba(255,255,255,.66); }.system-kicker { margin: .3rem 1rem .45rem; color: var(--navy); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; }.system-visual { position: relative; isolation: isolate; margin: 0 .5rem .35rem; overflow: hidden; border: 1px solid #dfecee; border-radius: 14px; background-color: #f7fcfc; background-image: linear-gradient(rgba(79, 161, 170, .08) 1px, transparent 1px), linear-gradient(90deg, rgba(79, 161, 170, .08) 1px, transparent 1px); background-size: 21px 21px; }.system-visual img { position: relative; z-index: 1; display: block; width: 100%; height: auto; }.hotspot { position: absolute; z-index: 2; width: 30px; height: 30px; display: grid; place-items: center; padding: 0; border: 3px solid white; border-radius: 50%; color: white; background: var(--navy); box-shadow: none; font-family: inherit; font-size: .7rem; font-weight: 700; line-height: 1; cursor: pointer; transition: background .18s ease, transform .18s ease; }.hotspot:hover, .hotspot.active { background: var(--amber); transform: scale(1.12); }.hotspot-pipe { top: 46%; left: 42%; }.hotspot-flow { top: 71%; left: 15%; }.hotspot-slope { top: 77%; left: 63%; }.hotspot-heater { top: 62%; left: 37%; }.hotspot-fixtures { top: 49%; left: 76%; }
.system-selector { display: grid; grid-template-columns: repeat(5, 1fr); gap: .35rem; padding: .1rem .5rem .7rem; }.system-choice { min-height: 48px; padding: .35rem; border: 1px solid transparent; border-radius: 8px; color: #426276; background: transparent; font-family: inherit; font-size: .69rem; font-weight: 600; line-height: 1.2; cursor: pointer; }.system-choice b { display: block; color: var(--aqua); font-size: .65rem; }.system-choice.selected { color: var(--navy); border-color: #b7d8dc; background: #eaf8f8; }.system-choice.selected b { color: var(--blue); }.system-result { min-height: 55px; margin: 0 .5rem; padding: .65rem .8rem; border-left: 3px solid var(--aqua); border-radius: 0 8px 8px 0; background: #f0f8f8; color: #35586a; font-size: .82rem; line-height: 1.4; }.system-result strong { display: block; color: var(--navy); }.system-result small { display: block; margin-top: .1rem; color: #6b8190; font-size: .7rem; }
.system-result { min-height: 0; padding: .95rem 1rem; }.system-result > p:not(.system-result-kicker) { margin: 0; color: #426271; font-size: .76rem; line-height: 1.55; }.system-result-kicker { margin: 0 0 .18rem; color: var(--blue); font-size: .62rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; }.system-result h2 { margin: 0 0 .28rem; color: var(--navy); font-size: .95rem; line-height: 1.25; }.system-result-details { display: grid; gap: .32rem; margin: .65rem 0 .75rem; padding: .62rem .7rem; border: 1px solid #d5e8e9; border-radius: 7px; background: rgba(255,255,255,.72); }.system-result-details p { margin: 0; color: #527080; font-size: .67rem; line-height: 1.45; }.system-result-details b { display: inline-block; min-width: 76px; margin-right: .35rem; color: var(--navy); font-size: .62rem; text-transform: uppercase; letter-spacing: .05em; }.system-result-link { display: inline-flex; align-items: center; gap: .65rem; color: white; background: var(--navy); padding: .48rem .66rem; border-radius: 6px; font-size: .68rem; font-weight: 600; text-decoration: none; }.system-result-link:hover { background: #124870; }.system-result-link span { font-size: .9rem; line-height: 1; }
.section { padding: clamp(4rem, 7vw, 6.5rem) clamp(1.25rem, 5vw, 5.6rem); }.section-heading { max-width: 690px; margin-bottom: 2.2rem; }.section-heading h2, .limits h2 { margin-bottom: .7rem; color: var(--navy); font-size: clamp(1.8rem, 3.2vw, 2.75rem); line-height: 1.18; letter-spacing: -.045em; }.section-heading > p:last-child { margin-bottom: 0; color: var(--muted); }
.calculator-section { background: var(--white); }.calculator-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.2rem; max-width: 1460px; }.calculator-card { min-height: 430px; display: flex; flex-direction: column; padding: 1.35rem; border: 1px solid var(--line); border-radius: 16px; background: white; transition: transform .2s; }.calculator-card:hover { transform: translateY(-3px); }.live-card { border: 2px solid var(--navy); }.card-topline { display: flex; justify-content: space-between; align-items: center; }.card-number { color: var(--blue); font-size: .75rem; font-weight: 700; letter-spacing: .1em; }.status-live, .status-next { padding: .2rem .5rem; border-radius: 99px; font-size: .64rem; font-weight: 600; }.status-live { color: #0a6953; background: #dcf6ec; }.status-next { color: #69808d; background: #eef2f3; }.mini-diagram { width: 100%; height: 76px; margin: .5rem 0 .15rem; overflow: visible; stroke: var(--blue); fill: none; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }.mini-diagram text { fill: #62808d; stroke: none; font-family: Poppins, sans-serif; font-size: 13px; font-weight: 600; }.calculator-card h3 { margin-bottom: .25rem; color: var(--navy); font-size: 1.15rem; line-height: 1.3; }.question { min-height: 48px; margin-bottom: .9rem; color: #315369; font-size: .88rem; font-weight: 600; }.calculator-card dl { margin: 0 0 1rem; }.calculator-card dl div { margin: .55rem 0; display: grid; grid-template-columns: 70px 1fr; gap: .5rem; }.calculator-card dt { color: #6a8391; font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .07em; }.calculator-card dd { margin: 0; color: #496673; font-size: .76rem; line-height: 1.5; }.button { display: inline-flex; align-items: center; justify-content: space-between; gap: .8rem; width: 100%; margin-top: auto; padding: .72rem .85rem; border-radius: 8px; color: white; background: var(--navy); font-size: .78rem; font-weight: 600; text-decoration: none; }.button:hover { background: #12456c; }.button.disabled { color: #78909d; background: #edf2f3; cursor: default; }
.calculator-illustration { width: 100%; height: 104px; display: block; margin: .45rem 0 .25rem; object-fit: contain; object-position: center; }
.live-card { border: 1px solid var(--line); }.card-facts { width: 100%; margin: 0 0 1rem; border-collapse: collapse; border: 1px solid #dce7e9; border-radius: 7px; overflow: hidden; color: #496673; font-size: .72rem; line-height: 1.45; }.card-facts th, .card-facts td { padding: .48rem .52rem; text-align: left; vertical-align: top; }.card-facts th { width: 31%; color: #5b7886; background: #f3f8f8; font-size: .62rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; }.card-facts td { background: white; }.card-facts tr + tr th, .card-facts tr + tr td { border-top: 1px solid #e3ecee; }
.calculator-card .question { font-weight: 400; }
.calculator-section .calculator-grid { margin-top: 1.35rem; }
.system-result-details b { min-width: 91px; }
.calculator-card .calculator-illustration + h3 { margin-top: .8rem; }
.system-result-details { display: table; width: 100%; margin: .65rem 0 .75rem; padding: 0; border: 1px solid #d5e8e9; border-spacing: 0; border-radius: 7px; background: rgba(255,255,255,.72); }.system-result-details th, .system-result-details td { padding: .48rem .55rem; text-align: left; vertical-align: top; }.system-result-details th { width: 30%; color: var(--navy); background: rgba(255,255,255,.58); font-size: .62rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; }.system-result-details td { color: #527080; font-size: .67rem; line-height: 1.45; }.system-result-details tr + tr th, .system-result-details tr + tr td { border-top: 1px solid #dcebec; }
.system-result { border: 1px solid #d5e8e9; border-radius: 12px; background: white; }
.calculator-card .button { width: auto; justify-content: flex-end; margin-top: auto; margin-left: auto; padding: .55rem .75rem; border-radius: 7px; color: white; background: var(--blue); font-size: .75rem; font-weight: 700; }.calculator-card .button:hover { color: white; background: #126e7f; }.calculator-card .button span { display: inline-block; font-size: 1.1rem; line-height: 1; }
.faqs .faq-grid { grid-template-columns: 1fr; }
.limits { max-width: 850px; margin: 4.4rem auto 0; padding: clamp(1.5rem, 3vw, 2.15rem); border: 1px solid var(--line); border-radius: 14px; background: #f5fafa; text-align: left; }.limits-heading { display: flex; align-items: center; gap: .7rem; margin-bottom: .75rem; }.limits-heading h2 { margin: 0; }.limits-icon { width: 30px; height: 30px; flex: 0 0 30px; display: grid; place-items: center; color: var(--blue); }.limits-icon svg { width: 25px; height: 25px; }.limits > p { margin-bottom: 0; }
.hero { background: transparent; }
@media (min-width: 651px) { .calculator-grid { grid-auto-rows: 1fr; }.calculator-card { min-height: 480px; height: 100%; } }
.use-section { background: var(--pale); }.table-wrap { overflow: auto; border: 1px solid var(--line); border-radius: 15px; background: white; }.table-wrap table { width: 100%; min-width: 720px; border-collapse: collapse; text-align: left; }.table-wrap th { padding: .9rem 1.25rem; color: #66808e; background: #eaf2f3; font-size: .71rem; letter-spacing: .08em; text-transform: uppercase; }.table-wrap td { padding: 1rem 1.25rem; border-top: 1px solid #e2eaed; color: #385667; font-size: .85rem; }.table-wrap td:last-child { color: var(--navy); font-weight: 600; }.table-wrap a { color: var(--blue); }.table-wrap small { display: inline-block; margin-left: .4rem; color: #82939b; font-size: .67rem; font-weight: 500; }
.workflow-section { background: var(--navy); }.workflow-section .eyebrow { color: #79dadd; }.workflow-section h2 { color: white; }.workflow-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; border: 1px solid #37617d; border-radius: 14px; overflow: hidden; }.workflow-grid article { min-height: 280px; padding: 1.65rem; background: #103b5d; }.workflow-tag { color: #83dcde; font-size: .68rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; }.workflow-grid h3 { margin: .55rem 0 .6rem; color: white; font-size: 1.08rem; line-height: 1.35; }.workflow-grid p { min-height: 100px; margin-bottom: 1.3rem; color: #c3d5df; font-size: .8rem; line-height: 1.65; }.flow-line { display: flex; flex-wrap: wrap; align-items: center; gap: .35rem; color: #d9eff0; font-size: .71rem; font-weight: 600; }.flow-line span, .flow-line a { padding: .28rem .4rem; border: 1px solid #4f758d; border-radius: 5px; }.flow-line a { color: white; border-color: #6ed3d5; text-decoration: none; }.flow-line b { color: #7ee1e2; }.flow-line i { height: 1.4rem; border-left: 1px solid #52819a; margin: 0 .35rem; }
.methodology { background: white; }.method-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }.method-grid article { padding: 1.2rem; border-top: 3px solid var(--aqua); background: #f5fafa; }.method-grid h3 { margin-bottom: .55rem; color: var(--navy); font-size: .95rem; line-height: 1.4; }.method-grid p { margin: 0; color: #506c7a; font-size: .77rem; line-height: 1.6; }.limits { max-width: 850px; margin: 4.4rem auto 0; padding: 2rem 0 0; border-top: 1px solid var(--line); text-align: center; }.limits h2 { font-size: 1.55rem; }.limits p { margin-bottom: 0; color: var(--muted); font-size: .88rem; }
.faqs { background: var(--pale); }.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .8rem; }.faq-grid details { padding: .95rem 1.1rem; border: 1px solid var(--line); border-radius: 10px; background: white; }.faq-grid summary { color: var(--navy); font-size: .87rem; font-weight: 600; cursor: pointer; }.faq-grid p { margin: .75rem 0 .1rem; color: #58717f; font-size: .78rem; line-height: 1.65; }
footer { display: flex; align-items: center; justify-content: space-between; gap: 1.25rem; padding: 1.45rem clamp(1.25rem, 5vw, 5.6rem); color: #d6e8ed; background: #08283f; font-size: .76rem; } footer .brand { color: white; } footer .brand-mark { color: var(--navy); background: #7bdcdf; } footer p { margin: 0; } footer > a:last-child { color: #9de7e9; }
@media (max-width: 1050px) { .hero { grid-template-columns: 1fr; }.hero-copy { max-width: 820px; }.system-wrap { max-width: 680px; }.calculator-grid { grid-template-columns: repeat(2, 1fr); }.method-grid { grid-template-columns: repeat(2, 1fr); }.workflow-grid { grid-template-columns: 1fr; }.workflow-grid article { min-height: auto; }.workflow-grid p { min-height: 0; } }
@media (max-width: 650px) { .site-header { min-height: 64px; }.header-action { font-size: .72rem; }.hero { min-height: 0; padding-top: 3rem; }.hero h1 { font-size: 2.65rem; }.lede { font-size: .94rem; }.quick-tools { gap: .4rem; }.quick-tool { font-size: .66rem; }.system-wrap { margin: 0 -0.3rem; padding: .45rem; }.system-kicker { margin: .45rem .75rem .35rem; font-size: .67rem; }.system-visual { margin: 0 .25rem .3rem; }.hotspot { width: 26px; height: 26px; border-width: 2px; font-size: .62rem; }.system-selector { grid-template-columns: repeat(3, 1fr); }.system-choice { min-height: 42px; font-size: .61rem; }.calculator-grid, .method-grid, .faq-grid { grid-template-columns: 1fr; }.calculator-card { min-height: 0; }.question { min-height: 0; }.section { padding-top: 3.7rem; padding-bottom: 3.7rem; }.workflow-grid article { padding: 1.3rem; } footer { flex-direction: column; align-items: flex-start; } }

@media (min-width: 768px) {
  .site-header,
  .hero,
  .section,
  footer { padding-left: max(12.5%, calc((100% - 1050px) / 2)); padding-right: max(12.5%, calc((100% - 1050px) / 2)); }
  .limits { max-width: none; margin-left: 0; margin-right: 0; text-align: left; }
}

.limits { width: 100%; max-width: none; margin: 4.4rem 0 0; padding: clamp(1.5rem, 3vw, 2.15rem); border: 1px solid var(--line); border-radius: 14px; background: #f5fafa; text-align: left; }
.limits-heading { display: flex; align-items: center; gap: .75rem; margin-bottom: .85rem; }
.limits-heading h2 { margin: 0; font-size: clamp(1.2rem, 2vw, 1.5rem); }
.limits-icon { width: 27px; height: 27px; flex: 0 0 27px; display: grid; place-items: center; color: var(--blue); }
.limits-icon svg { width: 24px; height: 24px; }
.limits > p { margin: 0; color: var(--muted); font-size: .88rem; line-height: 1.7; }
.typical-jobs-table { max-width: 1460px; }
.typical-jobs-table table { min-width: 920px; }
.typical-jobs-table th:first-child { width: 22%; }
.typical-jobs-table th:nth-child(2) { width: 31%; }
.typical-jobs-table th:nth-child(3) { width: 20%; }
.typical-jobs-table td { vertical-align: top; line-height: 1.55; }
.typical-jobs-table a { font-weight: 700; }
.typical-jobs-table td:last-child { color: #385667; font-weight: 400; }
.methodology .limits { margin-top: 2rem; }
.system-result-link { background: var(--blue); }
.system-result-link:hover { background: #126e7f; }

.site-header .brand { color: var(--blue); }
.site-header .brand-mark { border-radius:0; background:var(--blue); -webkit-mask:url('/images/logo.svg') center / contain no-repeat; mask:url('/images/logo.svg') center / contain no-repeat; }
.site-header .brand-mark img { visibility:hidden; }