/* CalcHub Light 3.1 — self-contained system typography; no web fonts or trackers. */
:root{--ink:#172033;--muted:#637187;--bg:#f5f7fa;--card:#fff;--brand:#2563eb;--brand-hover:#1d4ed8;--blue-soft:#eef4ff;--line:#e2e7ef;--amber:#ab650a;--amber-soft:#fff6e6;--shadow:0 12px 40px rgba(23,40,70,.06);--radius:16px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:98px}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit}a{color:var(--brand)}button,a,input,select,textarea{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}a,button{transition:color .16s,background .16s,border-color .16s,box-shadow .16s}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #2563eb;outline-offset:4px}button{line-height:1.3}button svg,a svg{flex-shrink:0}button,input,select,textarea{color:inherit}.icon{width:22px;height:22px;display:inline-block;flex-shrink:0;vertical-align:middle}.wrap{width:min(1240px,calc(100% - 64px));margin-inline:auto}.hidden,[hidden]{display:none!important}.sr-only,.skip-link:not(:focus){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:focus{position:fixed;z-index:100;left:20px;top:10px;background:white;padding:12px;border:2px solid var(--brand);border-radius:8px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:44px;padding:11px 17px;background:var(--brand);border:1px solid transparent;color:#fff;text-decoration:none;font-size:13px;font-weight:650;border-radius:9px;white-space:normal}.btn .icon{width:18px;height:18px}.btn:hover{background:var(--brand-hover)}.btn.light{background:#fff;border-color:var(--line);color:#43526a}.btn.light:hover{border-color:#bbcbe2;background:#f7faff}.btn[aria-pressed=true]{border-color:#aac5ff;background:var(--blue-soft);color:var(--brand)}.small-link{font-size:13px;font-weight:600;text-decoration:none;display:inline-flex;align-items:center;gap:8px}.small-link .icon{width:17px;height:17px}.micro{font-size:12px;line-height:1.65;color:var(--muted)}.eyebrow{display:flex;align-items:center;gap:8px;font-size:11px;font-weight:650;letter-spacing:.75px;color:var(--muted)}.eyebrow.small{text-transform:uppercase;font-size:10px;letter-spacing:1.6px;margin-bottom:6px}.status-dot{width:6px;height:6px;background:var(--brand);border-radius:50%;box-shadow:0 0 0 4px #e8efff;margin-right:4px}.section-head{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:22px}.section-head h2{font-size:27px;line-height:1.25;letter-spacing:-.7px;font-weight:650;margin:0}.section-caption{font-size:12px;color:var(--muted);max-width:260px;text-align:right}.block{margin-block:48px}
/* Masthead */
.site-head{background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}.head-inner{min-height:76px;display:flex;align-items:center;gap:50px}.logo{display:inline-flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-size:26px;font-weight:750;letter-spacing:-1px;line-height:1.2}.logo-blue{color:var(--brand)}.logo-mark{display:grid;place-items:center;color:#fff;background:var(--brand);width:35px;height:35px;border-radius:10px}.logo-mark svg{width:29px;height:29px}.nav{display:flex;gap:30px;align-items:center}.nav a{font-size:13px;font-weight:550;color:#526077;text-decoration:none;white-space:nowrap}.nav a:hover{color:var(--brand)}body[data-page=home] .nav-catalog{color:var(--brand)}.head-actions{margin-left:auto;display:flex;gap:12px;align-items:center}.saved-nav{color:#3f4e64;font-size:12px;font-weight:600;text-decoration:none;display:flex;align-items:center;gap:8px;padding:10px 13px;border:1px solid var(--line);border-radius:9px;min-height:42px}.saved-nav:hover{background:var(--blue-soft);border-color:#ccdafa}.saved-nav .icon{width:18px;height:18px}.saved-count{font-variant-numeric:tabular-nums;padding:0 5px;border-radius:4px;color:var(--brand);background:var(--blue-soft);font-size:11px}.menu-button{display:none;align-items:center;justify-content:center;width:44px;height:44px;border:1px solid var(--line);border-radius:9px;background:#fff}
/* Homepage: small purposeful hero, not a photographic billboard. */
.hero{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(300px,.92fr);align-items:center;gap:54px;padding:54px 0 48px}.hero h1{font-size:clamp(35px,3.28vw,48px);line-height:1.18;letter-spacing:-1.8px;font-weight:690;margin:19px 0 19px}.hero h1 em{color:var(--brand);font-style:normal}.lead{font-size:15px;line-height:1.8;color:var(--muted);max-width:650px;margin:0 0 25px}.hero-search{min-height:61px;border:1px solid #d3ddec;border-radius:12px;background:white;display:flex;align-items:center;padding:6px;gap:12px;box-shadow:0 5px 18px #243c6810;max-width:650px}.hero-search>.icon{margin-left:11px;color:#8290a5;width:21px}.hero-search input{border:0;outline:0;min-width:0;flex:1;background:transparent;font-size:13px;height:42px}.hero-search input:focus-visible{outline:none}.hero-search:focus-within{border-color:#80a8ff;box-shadow:0 0 0 3px #2563eb15}.hero-search input::placeholder{color:#8090a6}.hero-search .btn{font-size:12px;min-height:46px;padding:11px 17px}.search-examples{display:flex;gap:12px;align-items:center;flex-wrap:wrap;color:#738198;font-size:11px;margin-top:10px}.search-examples button{border:0;background:none;padding:2px 0;color:#526985;border-bottom:1px solid #becadc;font-size:11px;border-radius:0}.search-examples button:hover{color:var(--brand);border-color:var(--brand)}.hero-reassurance{display:flex;gap:24px;flex-wrap:wrap;margin-top:23px;color:#69778b;font-size:11px}.hero-reassurance span{display:inline-flex;gap:5px;align-items:center}.hero-reassurance .icon{width:14px;height:14px;color:#6e88ac}.hero-sheet{display:block;padding:20px 21px 15px;border:1px solid #dce4ee;border-radius:17px;background:#fff;color:var(--ink);box-shadow:0 14px 42px #24477e0a;text-decoration:none;position:relative}.hero-sheet:before{content:"";position:absolute;inset:14px -9px -9px 14px;border:1px solid #e0e6ef;border-radius:17px;background:#edf2f8;z-index:-1}.hero-sheet:hover{border-color:#aac3e8;box-shadow:var(--shadow)}.sheet-heading{display:flex;align-items:center;gap:10px;margin-bottom:17px}.sheet-symbol{display:grid;place-items:center;width:36px;height:36px;background:var(--amber-soft);color:var(--amber);border:1px solid #f7e6c9;border-radius:9px}.sheet-symbol .icon{width:21px}.sheet-kicker{display:block;font-size:9px;color:#77849a;text-transform:uppercase;letter-spacing:1.2px}.sheet-heading h2{font-size:15px;line-height:1.35;margin:2px 0 0;letter-spacing:-.3px;font-weight:650}.sheet-id{margin-left:auto;align-self:flex-start;color:#bec8d7;font:11px/1.8 monospace}.blueprint-mini{display:block;width:100%;height:auto}.sheet-result{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:15px 0 11px}.sheet-result>div>span{font-size:10px;color:#6d7c91;display:block}.sheet-result strong{font-size:38px;font-weight:620;line-height:1.25;letter-spacing:-1.5px;display:block;font-variant-numeric:tabular-nums;color:#243a57}.sheet-result small{font-size:18px;font-weight:500;letter-spacing:0}.sheet-badge{display:flex;gap:3px;align-items:center;background:var(--blue-soft);border:1px solid #e2ebff;color:var(--brand);font-size:10px;padding:4px 7px;border-radius:5px}.sheet-badge .icon{width:12px;height:12px}.sheet-bottom{display:flex;justify-content:space-between;align-items:center;font-size:10px;gap:8px;border-top:1px solid var(--line);padding-top:13px;color:#738198}.sheet-bottom b{color:#42546c;font-weight:600;margin-left:4px}.sheet-link{color:var(--brand);display:flex;gap:3px;align-items:center;font-weight:600}.sheet-link .icon{width:14px;height:14px}.sheet-caution{display:block;margin-top:10px;font-size:9px;color:#8390a3;line-height:1.4}
/* Categories and searchable catalogue */
.category-section{border-top:1px solid var(--line);padding-top:29px}.category-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:11px}.category-card{position:relative;display:grid;grid-template-columns:39px 1fr;grid-template-rows:auto auto;align-items:center;column-gap:11px;padding:16px 13px;text-decoration:none;background:#fff;border:1px solid var(--line);border-radius:11px;min-height:85px}.category-card:hover,.category-card.active{border-color:#b1cafd;background:#fafcff}.category-icon{grid-row:1/3;width:38px;height:38px;background:#f0f5ff;color:var(--brand);border-radius:9px;display:grid;place-items:center}.category-icon .icon{width:21px;height:21px}.category-name{font-size:11px;font-weight:650;line-height:1.45;color:#26344a;align-self:end}.category-meta{font-size:9px;color:#79869a;align-self:start;margin-top:2px}.is-building .category-icon,.calc-card.is-building .tool-icon{background:var(--amber-soft);color:var(--amber)}.catalog-section{margin-top:44px;scroll-margin-top:100px}.catalog-tools{display:grid;grid-template-columns:minmax(0,1fr) 235px auto;gap:13px;align-items:center;background:#eff2f6;border:1px solid #e7ecf2;border-radius:12px;padding:12px;margin-bottom:19px}.search-wrap{position:relative;min-width:0}.search-wrap>.icon{position:absolute;width:18px;height:18px;left:13px;top:15px;color:#8191a9;pointer-events:none}.search-input,.cat-select{display:block;width:100%;height:48px;border:1px solid #dce3ed;border-radius:8px;background:#fff;color:var(--ink);font-size:12px;padding:10px 13px}.search-input{padding-left:40px}.search-input::placeholder{color:#8190a5}.cat-select{padding-right:27px;cursor:pointer}.catalog-count{padding:0 9px;font-size:11px;color:#78869b;white-space:nowrap;min-width:103px}.catalog-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px}.calc-card{min-width:0;position:relative;display:flex;flex-direction:column;align-items:flex-start;min-height:232px;padding:19px;background:#fff;border:1px solid var(--line);border-radius:13px;transition:border-color .15s,box-shadow .15s}.calc-card:hover{border-color:#c1d2ed;box-shadow:0 6px 20px #2c477412}.card-top{display:flex;align-items:center;justify-content:space-between;width:100%;margin-bottom:11px}.tool-icon{width:37px;height:37px;border-radius:9px;color:var(--brand);background:var(--blue-soft);display:grid;place-items:center}.tool-icon .icon{width:21px;height:21px}.fav-btn{display:inline-grid;place-items:center;width:36px;height:36px;min-width:36px;min-height:36px;border:1px solid transparent;border-radius:8px;background:none;color:#abb7c8;padding:7px;flex-shrink:0;position:relative;z-index:2}.fav-btn .icon{width:19px;height:19px}.fav-btn:hover{color:#6686b5;background:#f3f6fb}.fav-btn.on{color:var(--amber);background:var(--amber-soft)}.fav-btn.on svg{fill:#ffefce}.card-cat{color:#8b96a7;font-size:9px;line-height:1.4;letter-spacing:.25px;margin-bottom:5px}.card-title{font-size:15px;font-weight:650;line-height:1.45;text-decoration:none;color:#23324a;letter-spacing:-.2px;overflow-wrap:anywhere}.card-title:after{content:"";position:absolute;inset:0;border-radius:13px}.card-title:focus-visible:after{outline:3px solid var(--brand);outline-offset:3px}.card-title:hover{color:var(--brand)}.card-desc{font-size:11px;line-height:1.7;color:#77859a;margin:7px 0 14px;overflow-wrap:anywhere}.card-open{display:inline-flex;align-items:center;gap:7px;margin-top:auto;padding-top:4px;color:#6b84a7;font-size:10px;font-weight:550}.card-open .icon{width:14px;height:14px}.catalog-more{text-align:center;margin:24px 0 0}.catalog-more .btn{min-width:235px;background:transparent}.catalog-more .micro{display:block;margin-top:9px;font-size:10px}.empty{color:var(--muted);font-size:13px;border:1px dashed #d2dce9;border-radius:12px;padding:35px 22px;text-align:center;background:#fcfdff}.empty>.icon{display:block;margin:0 auto 10px;color:#8ca6c9;width:27px;height:27px}.empty>strong{display:block;color:#43516a;margin-bottom:4px;font-size:16px}.build-feature{display:grid;grid-template-columns:1.2fr 1fr;gap:75px;margin-top:48px;padding:36px 40px;border:1px solid #e3e5e8;border-radius:16px;background:linear-gradient(110deg,#fffdf8,#fff)}.build-feature .eyebrow{color:#9b7035}.build-feature h2{font-size:30px;line-height:1.25;margin:10px 0 15px;letter-spacing:-.8px;font-weight:630}.build-feature p{font-size:12px;line-height:1.8;color:var(--muted)}.build-feature .btn{margin-top:7px}.build-feature .build-disclaimer{font-size:10px;line-height:1.5;color:#8b857a;margin:12px 0 0}.build-steps{display:grid;gap:9px;align-content:center}.build-steps>div{display:flex;align-items:center;gap:15px;padding:16px 14px;background:#fbfcfe;border:1px solid #e8edf3;border-radius:10px}.build-steps>div>span{font:11px/1.2 monospace;color:#b7c1d0}.build-steps>div>.icon{color:#8b6b3f;width:24px;height:24px;margin-right:3px}.build-steps b{font-size:12px;font-weight:630}.build-steps p{font-size:10px;margin:1px 0 0;color:#8290a5}.saved-section{margin-top:45px}.saved-note{margin-top:-9px;max-width:760px;margin-bottom:20px}.recent-list{display:grid;gap:12px}.recent-list .empty{margin:0}.recent-list h3{font-size:15px;font-weight:600;margin:20px 0 4px}.saved-row{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:15px 18px;background:#fff;border:1px solid var(--line);border-radius:11px}.saved-row .btn{min-height:39px;padding:7px 12px;font-size:11px}.saved-row .micro{font-size:10px}.saved-row label{display:flex;align-items:center;gap:8px}.saved-row input{accent-color:var(--brand);width:17px;height:17px}.saved-title{font-size:13px;font-weight:600}.saved-actions{display:flex;gap:7px;flex-wrap:wrap}.about-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:42px;padding:31px 0 10px;margin-bottom:35px;border-top:1px solid var(--line)}.about-icon{display:block;color:#6c8abd;margin-bottom:11px}.about-icon .icon{width:22px;height:22px}.about-grid h3{font-size:15px;margin:0 0 7px;font-weight:600}.about-grid p{font-size:12px;line-height:1.8;color:var(--muted);margin:0}
/* Calculator pages */
.calc-wrap{max-width:1160px}.page-intro{padding-top:24px;padding-bottom:24px}.breadcrumb{display:flex;align-items:center;gap:7px;flex-wrap:wrap;color:#7b889e;font-size:11px;margin-bottom:25px}.breadcrumb a{text-decoration:none;color:#758298}.breadcrumb a:hover{color:var(--brand)}.breadcrumb .icon{height:12px;width:12px;color:#a3afc1}.category-pill{display:inline-flex;align-items:center;gap:6px;padding:4px 9px;border:1px solid #dce7fd;border-radius:6px;font-size:10px;color:#486faf;background:#f0f5ff}.category-pill .icon{width:14px;height:14px}.is-building .category-pill{background:var(--amber-soft);color:#94631f;border-color:#f4e5cf}.heading-actions{display:flex;align-items:center;justify-content:space-between;gap:15px}.heading-actions .fav-btn{border:1px solid var(--line);background:#fff;width:43px;height:43px}.page-intro h1{font-size:clamp(29px,3.2vw,39px);font-weight:640;line-height:1.25;letter-spacing:-1px;margin:12px 0 10px;max-width:950px;overflow-wrap:anywhere}.page-intro>p{font-size:13px;color:var(--muted);margin:0;max-width:850px}.scope-note{margin-bottom:22px;font-size:12px;color:#7c6440;border:1px solid #eadfcb;border-radius:10px;background:#fffbf3}.scope-note summary{display:flex;align-items:center;gap:10px;padding:12px 15px;list-style:none;cursor:pointer;font-weight:550;line-height:1.6}.scope-note summary::-webkit-details-marker{display:none}.scope-note summary>.icon:first-child{width:17px;height:17px;color:#aa8346}.scope-note summary>.icon:last-child{margin-left:auto;width:14px;height:14px;transition:transform .15s}.scope-note[open] summary>.icon:last-child{transform:rotate(90deg)}.scope-note summary small{font-size:10px;text-decoration:underline;text-underline-offset:2px;margin-left:8px;color:#8f7754;white-space:nowrap}.scope-note>div{padding:0 42px 17px;line-height:1.8;font-size:12px;color:#7b6d57}.calc-layout{display:grid;grid-template-columns:minmax(0,1.23fr) minmax(330px,.86fr);gap:23px;align-items:start}.panel{min-width:0;padding:26px;border:1px solid var(--line);border-radius:14px;background:#fff}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:22px;padding-bottom:17px;border-bottom:1px solid #e9edf4}.panel-heading>div{display:flex;align-items:center;gap:9px;min-width:0}.panel-heading>div>.icon{width:18px;height:18px;color:#8b9bb3}.panel h2{font-size:17px;font-weight:620;line-height:1.35;letter-spacing:-.2px;margin:0}.panel-tag{font-size:9px;color:#8996aa;white-space:nowrap}.field-group{border:0;padding:0;margin:0 0 25px;min-width:0}.field-group:last-of-type{margin-bottom:0}.field-group legend{width:100%;font-size:12px;font-weight:630;margin-bottom:15px;color:#4d5c73;display:flex;align-items:center;gap:9px;line-height:1.4}.field-group legend.sr-only{width:1px!important;display:block!important;left:0;margin:0;overflow:hidden}.field-group legend>span{font-size:9px;font-weight:600;color:#8f9bae;background:#f2f5f9;padding:2px 5px;border-radius:4px}.formgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px 15px}.field{min-width:0;display:flex;flex-direction:column;justify-content:flex-end}.field label{display:block;font-size:11px;color:#596a81;font-weight:550;line-height:1.65;margin-bottom:6px}.field input:not([type=checkbox]),.field select,.field textarea{width:100%;min-width:0;max-width:100%;border:1px solid #d9e1ec;background:#fafbfd;border-radius:8px;padding:10px 12px;color:#26384f;font-size:15px;line-height:1.5;min-height:45px;font-variant-numeric:tabular-nums}.field input:hover,.field select:hover,.field textarea:hover{border-color:#bdcce0}.field input:focus,.field select:focus,.field textarea:focus{background:#fff;border-color:#80a7f6;outline:2px solid #2563eb14;outline-offset:1px}.field input[type=date]{appearance:none;-webkit-appearance:none}.field textarea{min-height:125px;resize:vertical;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:12px;line-height:1.7}.field.wide{grid-column:1/-1}.check-label{display:flex!important;align-items:center;gap:10px;min-height:35px;margin:0!important}.check-label input{width:17px;height:17px;flex-shrink:0;accent-color:var(--brand)}.field-hint{color:#8a97aa;font-size:10px;line-height:1.7;margin:12px 0 0}.form-actions{display:flex;align-items:center;gap:10px;margin-top:25px;border-top:1px solid #edf0f6;padding-top:19px}.form-actions .primary{flex:1;min-height:47px}.form-actions .light{min-height:47px}.form-footnote{display:flex;align-items:flex-start;gap:6px;margin:14px 0 0;font-size:10px;color:#8b97a9}.form-footnote>.icon{width:13px;height:13px;margin-top:2px}.result-panel{position:sticky;top:98px;border-top:3px solid var(--brand);padding:24px 24px 21px;background:#fff;box-shadow:0 6px 25px #1b447506}.result-panel .panel-heading{margin-bottom:18px;padding-bottom:15px}.result-panel .panel-heading>div>.icon{color:var(--brand)}.result-status{font-size:9px;color:#8896aa;white-space:nowrap}.result-status.ready{color:var(--brand);padding:3px 7px;background:var(--blue-soft);border-radius:4px}.result-placeholder{text-align:center;padding:15px 15px 28px}.result-placeholder>span{display:grid;place-items:center;width:55px;height:55px;border-radius:14px;background:#f2f6fd;color:#95afd5;margin:0 auto 14px}.result-placeholder>span>.icon{width:27px;height:27px}.result-placeholder h3{font-size:14px;font-weight:600;color:#64758d;margin:0 0 7px}.result-placeholder p{font-size:12px;color:#8b99ac;line-height:1.8;margin:0}.result-empty{font-size:13px;color:#8492a7;padding:15px 0}.result-row{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;padding:11px 0;border-bottom:1px solid #edf1f6;font-size:11px;line-height:1.65}.result-row>span{color:#73839b}.result-row b{font-weight:650;color:#374a65;text-align:right;font-variant-numeric:tabular-nums;white-space:normal;overflow-wrap:anywhere;min-width:75px}.result-row:first-child{display:block;background:#f3f7ff;border:1px solid #e4edff;border-radius:10px;padding:17px 18px;margin-bottom:8px}.result-row:first-child>span{font-size:11px;display:block;margin-bottom:5px;color:#6480aa}.result-row:first-child>b{display:block;font-size:36px;font-weight:640;line-height:1.25;text-align:left;color:var(--brand);letter-spacing:-1px;margin:0}.result-row:first-child .result-unit{font-size:.48em;letter-spacing:0;font-weight:550}.result-row:last-child{border-bottom:0}.result-row.is-cost{padding-top:14px;margin-top:3px;border-top:1px solid #e2e9f3}.result-row.is-cost b{color:var(--brand);font-size:14px}.save-box{margin-top:22px;padding:16px;background:#f9fbfe;border:1px solid #e8edf5;border-radius:10px}.saved-label{font-size:10px;display:block;color:#6f8099;margin-bottom:6px}.saved-name{width:100%;background:#fff;border:1px solid #dfe6ef;border-radius:7px;padding:9px 10px;font-size:12px;min-height:41px}.saved-name::placeholder{color:#9aa6b8}.save-box .btn{width:100%;margin-top:9px;font-size:12px;min-height:40px}.export-label{font-size:9px;text-transform:uppercase;letter-spacing:1px;color:#8a98ac;margin:20px 0 9px}.result-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px}.result-actions .btn{font-size:11px;min-height:39px;padding:8px 9px}.result-actions .icon{width:15px;height:15px}.local-note{font-size:9px;line-height:1.8;display:flex;align-items:flex-start;gap:6px;margin:13px 0 0;color:#8b97aa}.local-note .icon{width:12px;height:12px;margin-top:3px}.error{background:#fff2f1;border:1px solid #efc1bb;padding:12px;color:#9c3024;border-radius:8px;font-size:12px;margin-top:17px}.dirty{display:flex;align-items:flex-start;gap:6px;background:#fff7e9;color:#956925;font-size:11px;line-height:1.7;border-radius:6px;padding:10px}.dirty .icon{width:16px;height:16px;margin-top:1px}
/* Technical results and material schedule */
#details{min-width:0}.detail-panel{margin-top:22px}.detail-panel>h2{margin-bottom:18px}.detail-panel .panel-heading{margin-bottom:16px}.detail-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}.detail-heading h2{display:flex;align-items:center;gap:9px}.detail-heading h2>.icon{width:19px;height:19px;color:#8b9fb9}.detail-number{font-size:9px;color:#929fb1;letter-spacing:1px}.notice{margin-top:22px;padding:14px 17px;background:#fffbf3;border:1px solid #eadfcb;color:#8a713e;border-radius:10px;font-size:11px;line-height:1.8}.notice strong{font-size:11px;font-weight:650;display:block;margin-bottom:4px}.scheme-panel{max-width:100%;padding-bottom:19px}.scheme-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:25px;align-items:center}.scheme-description{border-left:1px solid #e8edf4;padding-left:22px}.scheme-description b{font-size:13px;font-weight:600;color:#405570}.scheme-description p{font-size:11px;color:#8190a5;line-height:1.8}.scheme-tag{display:inline-flex;padding:4px 8px;font-size:9px;color:var(--amber);background:var(--amber-soft);border:1px solid #f1e4ce;border-radius:5px;margin-top:3px}.diagram{display:block;width:100%;height:280px;border:1px solid #e4eaf3;border-radius:9px;background:#f9fbfe}.diagram-label{font:12px -apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;fill:#5a7190}.diagram-caption{font:9px -apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;fill:#8c9bb0;letter-spacing:1px}.table-wrap{max-width:100%;overflow-x:auto;border:1px solid #e2e8f1;border-radius:9px;overscroll-behavior-x:contain}table{width:100%;border-collapse:collapse;white-space:normal;font-size:12px;line-height:1.6}th,td{padding:13px 15px;border-bottom:1px solid #e8edf5;text-align:left;vertical-align:top}th{font-size:10px;color:#6f8098;background:#f4f7fb;font-weight:600;white-space:nowrap}td{color:#4b5d78}td:not(:first-child){font-variant-numeric:tabular-nums}tbody tr:nth-child(even){background:#fbfcfe}tbody tr:hover{background:#f6f9ff}tbody tr:last-child td{border-bottom:0}.materials-panel th:not(:first-child),.materials-panel td:not(:first-child){text-align:right}.materials-panel td:first-child{font-weight:550;color:#3f526c}.materials-panel td:last-child{font-weight:600;color:#315c99}.materials-panel .micro{font-size:10px;margin-top:12px}.method{margin-top:32px;margin-bottom:36px}.method .panel-heading{margin-bottom:16px}.method p{font-size:12px;overflow-wrap:anywhere}.formula-text{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:12px!important;background:#f6f8fb;padding:15px 17px;border:1px solid #e7edf4;border-radius:8px;color:#586c8a;line-height:1.9}.method h3{font-size:13px;font-weight:600;margin-top:24px}.method .micro{font-size:10px;color:#8a97aa}.source-list a{display:block;font-size:11px;overflow-wrap:anywhere;text-decoration:none;padding:5px 0}.source-list .icon{width:12px;height:12px}.related .catalog-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.related .calc-card{min-height:215px}.related .section-head h2{font-size:23px}.print-inputs{display:none}
/* Footer and messages */
.footer{border-top:1px solid var(--line);background:#fff;padding-top:36px;margin-top:55px}.footer-main{display:grid;grid-template-columns:1fr 1.2fr;gap:75px;padding-bottom:28px}.footer .logo{font-size:24px;gap:0}.footer p{font-size:11px;line-height:1.8;color:#8490a3;margin:7px 0}.footer-copy p{font-size:10px;line-height:1.9;max-width:560px}.release-tag{display:inline-block;font-size:9px;color:#96a1b2;margin-top:10px}.footer-bottom{border-top:1px solid #edf0f5;display:flex;align-items:center;gap:40px;padding-block:17px;font-size:10px;color:#98a3b3}.footer-bottom>a{margin-left:auto;color:#7990b2;text-decoration:none}.toast{position:fixed;bottom:23px;left:50%;transform:translateX(-50%);width:max-content;max-width:calc(100% - 30px);background:#22334f;color:white;border-radius:11px;padding:12px 19px;font-size:12px;z-index:60;box-shadow:0 8px 24px #1f39582b}.toast[hidden]{display:none}
/* Tablet and mobile */
@media(min-width:1550px){.hero h1{font-size:47px}}
@media(max-width:1150px){.wrap{width:calc(100% - 48px)}.head-inner{gap:35px}.nav{gap:22px}.hero{gap:35px;grid-template-columns:1.32fr .95fr}.hero h1{font-size:38px;letter-spacing:-1.4px}.hero-search .btn{padding-inline:11px}.hero-search .btn .icon{display:none}.category-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.category-card{padding-inline:15px}.category-name{font-size:12px}.category-meta{font-size:10px}.catalog-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.calc-layout{grid-template-columns:minmax(0,1.2fr) minmax(320px,.88fr);gap:18px}.panel{padding:21px}.result-panel{padding:20px}.panel-tag{display:none}.build-feature{gap:40px}}
@media(max-width:900px){.head-inner{gap:27px}.nav{gap:18px}.nav a{font-size:12px}.saved-nav>span:not(.saved-count){display:none}.hero{grid-template-columns:1fr .82fr;gap:26px;padding-top:38px}.hero h1{font-size:33px}.hero h1 br{display:none}.hero .eyebrow{font-size:9px}.lead{font-size:13px}.hero-search{gap:7px}.hero-search input{font-size:12px}.hero-search .btn{padding-inline:10px;font-size:11px}.hero-sheet{padding:15px}.sheet-heading h2{font-size:13px}.sheet-result strong{font-size:33px}.sheet-badge{display:none}.sheet-bottom{flex-wrap:wrap}.sheet-caution{font-size:8px}.hero-reassurance{gap:12px;font-size:10px}.search-examples{gap:8px}.search-examples button{font-size:10px}.hero-reassurance .icon{width:12px}.calc-layout{grid-template-columns:minmax(0,1fr) minmax(300px,.88fr)}.calc-layout .formgrid{grid-template-columns:1fr}.form-actions .light{padding:10px}.form-actions .light .icon{display:none}.result-row:first-child>b{font-size:31px}.scope-note summary{font-size:11px}.scheme-layout{grid-template-columns:minmax(0,1fr) 190px}.build-feature{padding:28px;gap:26px}.build-feature h2{font-size:27px}.build-steps>div{padding:13px;gap:10px}.catalog-tools{grid-template-columns:minmax(0,1fr) 210px}.catalog-count{grid-column:1/-1;padding:0;font-size:10px}.catalog-tools{gap:9px}.footer-main{gap:40px}}
@media(max-width:700px){html{scroll-padding-top:83px}.wrap{width:calc(100% - 32px)}.head-inner{min-height:65px;gap:15px}.logo{font-size:23px;gap:8px}.logo-mark{width:32px;height:32px;border-radius:9px}.logo-mark svg{width:27px;height:27px}.head-actions{gap:8px}.menu-button{display:inline-flex;min-width:42px;min-height:42px;width:42px;height:42px}.saved-nav{padding:10px;min-width:42px;min-height:42px}.nav{display:none;position:absolute;left:0;right:0;top:65px;padding:18px 22px;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 9px 18px #172f5110;gap:0}.nav.open{display:flex;flex-direction:column;align-items:stretch}.nav a{font-size:14px;padding:12px 0}.hero{display:block;padding:29px 0 29px}.hero h1{font-size:34px;line-height:1.2;letter-spacing:-1.1px;max-width:530px;margin-top:15px;margin-bottom:16px}.hero h1 br{display:initial}.hero .eyebrow{font-size:9px;letter-spacing:.2px}.hero .lead{font-size:13px;line-height:1.8;max-width:470px;margin-bottom:20px}.hero-search{min-height:57px;padding:5px;gap:6px;border-radius:10px}.hero-search>.icon{width:18px;height:18px;margin-left:8px}.hero-search input{font-size:12px;min-height:41px}.hero-search .btn{min-height:43px;padding-inline:11px;font-size:11px}.hero-search input::placeholder{font-size:11px}.search-examples{margin-top:11px;gap:10px;font-size:10px}.search-examples button{font-size:10px;min-height:24px}.hero-reassurance{gap:17px;margin-top:17px;font-size:10px}.hero-sheet{display:none}.desktop-br{display:none}.category-section{padding-top:23px}.section-head{margin-bottom:17px;align-items:center;gap:12px}.section-head h2{font-size:23px;letter-spacing:-.6px}.eyebrow.small{font-size:8px;letter-spacing:1.1px}.section-caption{display:none}.category-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}.category-card{padding:12px 9px;grid-template-columns:1fr;grid-template-rows:auto auto auto;justify-items:start;min-height:106px;row-gap:0;align-items:start}.category-icon{width:32px;height:32px;border-radius:8px;grid-row:auto;margin-bottom:8px}.category-icon .icon{width:18px;height:18px}.category-name{font-size:10px;line-height:1.4;align-self:start}.category-meta{font-size:8px;line-height:1.4;margin-top:3px}.catalog-section{margin-top:30px}.catalog-section>.section-head>.btn{font-size:10px;min-height:38px;padding:8px 10px;gap:5px}.catalog-section>.section-head>.btn .icon{width:15px;height:15px}.catalog-tools{padding:10px;gap:8px;grid-template-columns:1fr 1fr;border-radius:10px;margin-bottom:13px}.search-wrap{grid-column:1/-1}.cat-select{height:40px;font-size:11px;padding-block:7px}.search-input{height:43px;font-size:12px}.search-wrap>.icon{top:13px;width:17px;height:17px}.catalog-count{grid-column:auto;font-size:9px;text-align:right;padding-right:1px;min-width:0}.catalog-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.calc-card{min-height:223px;padding:14px;border-radius:11px}.card-title{font-size:13px;line-height:1.45;letter-spacing:-.1px}.card-cat{font-size:8px;margin-bottom:4px}.card-desc{font-size:10px;line-height:1.65;margin-block:6px 12px}.card-top{margin-bottom:10px}.tool-icon{width:33px;height:33px;border-radius:8px}.tool-icon .icon{width:19px;height:19px}.fav-btn{width:33px;height:33px;min-height:33px;min-width:33px;padding:6px}.fav-btn .icon{width:18px;height:18px}.card-open{font-size:9px;gap:4px}.catalog-more{margin-top:20px}.catalog-more .btn{font-size:12px;min-height:44px;min-width:220px}.build-feature{grid-template-columns:1fr;padding:25px 22px;gap:22px;margin-top:32px}.build-feature h2{font-size:27px;letter-spacing:-.6px}.build-feature p{font-size:12px}.build-feature .btn{font-size:11px;padding-inline:14px}.build-feature .build-disclaimer{font-size:9px}.build-steps>div{padding:14px}.build-steps b{font-size:12px}.build-steps p{font-size:10px}.saved-section{margin-top:32px}.saved-section .section-head .btn{font-size:10px;min-height:39px;padding:8px 10px}.saved-section .section-head .btn .icon{width:15px;height:15px}.saved-note{font-size:10px;line-height:1.8;margin-top:0}.empty{font-size:11px;padding:25px 17px}.saved-row{align-items:flex-start;flex-direction:column;padding:14px}.saved-title{font-size:12px}.saved-row .micro{font-size:9px;margin-top:4px}.saved-actions{width:100%;justify-content:flex-end}.about-grid{grid-template-columns:1fr;gap:23px;padding-top:23px;margin-bottom:15px}.about-grid>div{position:relative;padding-left:36px}.about-icon{position:absolute;left:0;top:0}.about-icon .icon{width:21px;height:21px}.about-grid h3{font-size:14px}.about-grid p{font-size:11px}.block{margin-block:30px}.calc-layout{grid-template-columns:1fr;gap:17px}.calc-layout .formgrid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px 12px}.result-panel{position:static}.page-intro{padding-top:16px;padding-bottom:19px}.breadcrumb{font-size:10px;margin-bottom:19px;gap:4px}.breadcrumb .icon{width:11px}.category-pill{font-size:9px}.page-intro h1{font-size:29px;letter-spacing:-.8px;margin-block:11px 9px}.heading-actions{gap:11px;align-items:flex-start}.heading-actions .fav-btn{width:38px;height:38px;min-width:38px;margin-top:10px}.page-intro>p{font-size:12px;line-height:1.75}.scope-note{margin-bottom:17px}.scope-note summary{padding:11px 12px;align-items:flex-start;font-size:10px;gap:8px;line-height:1.7}.scope-note summary>.icon:first-child{width:15px;height:15px;margin-top:2px}.scope-note summary>.icon:last-child{margin-top:2px;width:13px;min-width:13px}.scope-note summary small{font-size:9px;margin-left:4px}.scope-note>div{padding:0 16px 14px;font-size:11px}.panel{padding:19px 17px;border-radius:12px}.panel-heading{margin-bottom:19px;padding-bottom:14px;gap:10px}.panel h2{font-size:16px}.panel-heading>div>.icon{width:17px;height:17px}.panel-tag{display:inline;font-size:8px}.field-group legend{font-size:11px;gap:7px}.field-group legend>span{font-size:8px}.field label{font-size:10px;line-height:1.65}.field input:not([type=checkbox]),.field select,.field textarea{font-size:16px;min-height:46px;padding:10px}.field textarea{font-size:12px}.field-group{margin-bottom:23px}.field-hint{font-size:9px}.form-actions .btn{font-size:12px;min-height:46px}.form-actions .light .icon{display:initial;width:16px;height:16px}.form-footnote{font-size:9px}.result-status{font-size:9px}.result-panel .panel-heading{margin-bottom:14px}.result-row{font-size:11px;padding-block:11px}.result-row:first-child>b{font-size:38px}.save-box{margin-top:18px}.saved-name{font-size:16px}.save-box .btn{min-height:45px}.saved-label{font-size:11px}.result-actions .btn{min-height:43px;font-size:11px}.export-label{font-size:9px}.local-note{font-size:10px}.result-placeholder{padding:18px 8px 25px}.result-placeholder p{font-size:12px}.detail-heading h2{font-size:15px}.detail-heading h2>.icon{width:17px;height:17px}.detail-number{font-size:8px}.scheme-layout{grid-template-columns:1fr;gap:14px}.diagram{height:246px}.scheme-description{border-left:0;border-top:1px solid var(--line);padding:11px 0 0}.scheme-description b{font-size:12px}.scheme-description p{font-size:10px;margin:5px 0}.scheme-tag{font-size:9px}.table-wrap table{font-size:11px}td,th{padding:10px 12px}th{font-size:9px}.table-wrap{border-radius:7px}.table-wrap th{white-space:normal;min-width:76px}.table-wrap th:first-child{min-width:150px}.notice{font-size:10px;padding:12px;margin-top:17px}.notice strong{font-size:10px}.detail-panel{margin-top:17px}.formula-text{padding:12px;font-size:11px!important}.method p{font-size:11px}.method .micro{font-size:9px}.related .catalog-grid{grid-template-columns:1fr}.related .calc-card{min-height:0;display:grid;grid-template-columns:43px 1fr;column-gap:11px;padding:16px}.related .card-top{grid-row:1/4;margin:0;align-items:flex-start}.related .card-top .fav-btn{position:absolute;top:8px;right:8px}.related .card-cat{padding-right:26px}.related .card-title{padding-right:22px}.related .card-desc{margin-bottom:0}.related .card-open{display:none}.related .section-head h2{font-size:21px}.related .small-link{font-size:10px}.footer{margin-top:35px;padding-top:25px}.footer-main{grid-template-columns:1fr;gap:20px;padding-bottom:22px}.footer .logo{font-size:23px}.footer p{font-size:10px}.footer-copy p{font-size:9px}.release-tag{font-size:8px}.footer-bottom{font-size:9px;gap:15px;padding-block:15px}.footer-bottom>span:nth-child(2){display:none}.toast{font-size:11px;padding:11px 14px;bottom:18px}}
@media(max-width:370px){.wrap{width:calc(100% - 24px)}.hero h1{font-size:30px}.hero h1 br{display:none}.hero-search .btn{padding-inline:9px}.hero-search input::placeholder{font-size:10px}.hero-reassurance{gap:11px;font-size:9px}.category-grid{gap:7px}.category-card{padding:11px 8px;min-height:103px}.category-name{font-size:9px}.category-meta{font-size:7px}.card-title{font-size:12px}.calc-card{padding:12px;min-height:224px}.card-desc{font-size:9px}.calc-layout .formgrid{grid-template-columns:1fr}.page-intro h1{font-size:26px}.panel-tag{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}

/* Readability and standalone preview parity. */
#site-header{position:sticky;top:0;z-index:30}#site-header .site-head{position:static}
.category-name{font-size:12px}.category-meta{font-size:10px;color:#697c94}.card-cat{font-size:10px;color:#687b94}.card-desc{color:#65778f}.catalog-count,.section-caption,.sheet-caution,.field-hint,.form-footnote,.local-note,.panel-tag,.result-status,.detail-number,.release-tag{color:#687a93}.sheet-kicker,.sheet-id,.sheet-result>div>span,.sheet-bottom,.saved-label,.export-label{color:#687a93}.footer p,.footer-copy p,.footer-bottom,.method .micro,.result-placeholder p{color:#65758c}.card-open{font-size:11px}.field label{font-size:12px}.blueprint-mini{max-height:158px}.hero{padding-top:44px;padding-bottom:38px}
@media(max-width:700px){.hero{padding-top:29px;padding-bottom:29px}.hero h1{font-size:32px}.hero h1 br{display:none}.category-name{font-size:10px}.category-meta{font-size:9px}.card-cat{font-size:9px}.card-open{font-size:10px}.field label{font-size:11px}.panel-tag{font-size:9px}.hero-reassurance{color:#5d708c}.catalog-count{font-size:10px}.saved-label{font-size:11px}}
@media(max-width:370px){.hero h1{font-size:29px}.category-name{font-size:10px}.category-meta{font-size:8px}.card-cat{font-size:8px}.card-open{font-size:9px}}

@media print{@page{size:A4;margin:13mm}html{scroll-padding-top:0;scroll-behavior:auto}body{background:#fff;color:#172033;font-size:10pt;line-height:1.45}.site-head,.footer,.no-print,.related,.form-panel,.result-actions,.save-box,.export-label,.local-note,.form-actions,.fav-btn,.toast,#dirty,.breadcrumb,.result-status,.scope-note summary>svg,.scope-note summary small{display:none!important}.wrap{width:100%;max-width:none;margin:0}.page-intro{padding:0 0 15px}.page-intro h1{font-size:23pt;margin:7px 0}.page-intro>p{font-size:10pt}.category-pill{border:0;background:none;padding:0}.calc-layout{display:block}.panel{padding:15px;border:1px solid #cbd4e1;border-radius:5px;box-shadow:none;break-inside:auto}.panel-heading{margin-bottom:11px;padding-bottom:10px}.result-panel{position:static;border-top:2px solid #657995;min-height:0}.result-row{font-size:10pt}.result-row:first-child{background:#f6f8fb;border:1px solid #e1e6ee;padding:13px}.result-row:first-child>b{font-size:26pt;color:#263d5c}.result-row>span,.result-row b{color:#26364a}.result-row:not(:first-child){padding:7px 0}.print-inputs{display:block;margin:20px 0}.print-inputs h2{font-size:13pt}.print-inputs table{font-size:9pt}.detail-panel{margin-top:18px}.scope-note{border:1px solid #d7d7d7;background:#fff;margin:0 0 15px}.scope-note summary{padding:8px;font-size:9pt}.scope-note>div{display:block!important;padding:8px;font-size:8pt}.table-wrap{overflow:visible;border-color:#cbd4e1}.table-wrap table{font-size:8.5pt;table-layout:auto}thead{display:table-header-group}tr,svg{break-inside:avoid}td,th{padding:7px 9px;white-space:normal;min-width:0!important}th{font-size:8.5pt;color:#26364a;background:#eef2f7}.notice{font-size:8pt;break-inside:avoid}.scheme-layout{grid-template-columns:1fr 170px}.diagram{height:210px}.scheme-description p{font-size:8pt}.method{margin:20px 0}.source-list a{color:#26364a;font-size:8pt}.method .micro{font-size:8pt}.formula-text{font-size:9pt!important}.block{margin:20px 0}.panel-heading h2{font-size:13pt}.detail-heading h2{font-size:13pt}.hero,.category-section,.catalog-section,.build-feature,.saved-section,.about-grid{display:none}.print-inputs th,.print-inputs td{font-size:8.5pt}.table-wrap tbody tr:nth-child(even){background:#fff}}
/* Keep printed explanations with their headings, and avoid a nearly empty last page. */
@media print{.panel{padding:12px}.panel-heading{break-after:avoid}.method{break-inside:avoid;margin:16px 0}.method .panel-heading{margin-bottom:8px;padding-bottom:8px}.method p{margin-block:8px}.print-inputs th,.print-inputs td{padding:5px 8px}.result-row:not(:first-child){padding:5px 0}.result-row:first-child{padding:10px}.scheme-layout .diagram{height:185px}.detail-panel{margin-top:14px}}