:root{--ink:#20262e;--muted:#52606d;--paper:#f5f7fa;--charcoal:#252c35;--orange:#ff9b45;--line:#d9dfe7;--white:#fff;--accent:#b7460a;--accent-hover:#963807;--radius:20px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:inherit;text-underline-offset:4px}button,input{font:inherit}a,button,input{touch-action:manipulation}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #a84108;outline-offset:5px}.skip{position:absolute;top:-90px;left:20px;z-index:10;background:white;padding:12px}.skip:focus{top:10px}.wrap{width:min(1180px,calc(100% - 64px));margin:auto}.header{border-bottom:1px solid var(--line);background:var(--paper)}.header-row{min-height:92px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-size:20px;font-weight:800;line-height:1.1;letter-spacing:-.7px}.brand-mark{width:40px;height:40px;display:grid;place-items:center;background:var(--charcoal);color:var(--orange);border-radius:11px}.brand small{display:block;font-size:10px;letter-spacing:2.4px;margin-top:6px;font-weight:600}.nav{display:flex;gap:30px;align-items:center;font-size:14px;font-weight:650}.nav a{text-decoration:none}.nav a:hover{text-decoration:underline}.nav .nav-cta{padding:12px 18px;border:1px solid var(--line);border-radius:8px}.eyebrow{text-transform:uppercase;font-size:11px;letter-spacing:2px;font-weight:750;color:var(--charcoal);display:flex;align-items:center;gap:9px}.eyebrow:before{content:'';height:7px;width:7px;border-radius:50%;background:var(--charcoal)}.hero{padding:76px 0 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p{color:var(--muted);margin:0;font-size:15px}.small-link{font-size:13px;font-weight:650;white-space:nowrap}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.card{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:27px;display:flex;flex-direction:column;text-decoration:none;transition:transform .18s,box-shadow .18s}.card:hover{transform:translateY(-3px);box-shadow:0 8px 28px #20262e10;border-color:#a84108}.card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:25px}.iconbox{height:52px;width:52px;background:#edf0f5;border-radius:13px;display:grid;place-items:center;color:var(--charcoal)}.iconbox svg{width:29px;height:29px}.tag{font-size:10px;text-transform:uppercase;letter-spacing:1px;color:var(--muted)}.card h3{font-size:21px;line-height:1.3;letter-spacing:-.5px;margin-bottom:12px}.card 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var(--line);display:flex;justify-content:space-between;font-size:11px;color:var(--muted)}.page-head{padding:55px 0 30px;max-width:850px}.page-head h1{font-size:46px;letter-spacing:-1.8px;line-height:1.15}.lead{color:var(--muted);font-size:18px;line-height:1.7}.breadcrumb{font-size:12px;color:var(--muted);margin-bottom:27px}.article-layout{display:grid;grid-template-columns:minmax(0,760px) 280px;gap:70px;padding:15px 0 70px}.prose h2{font-size:25px;margin-top:38px}.prose h2:first-child{margin-top:0}.prose p,.prose li{font-size:16px;color:#42505f}.prose li{margin:10px 0}.aside-box{padding:25px;border:1px solid var(--line);background:#eaf0f6;border-radius:16px;height:fit-content}.aside-box h2{font-size:19px}.aside-box ul{padding-left:20px;font-size:13px}.aside-box li{margin:14px 0}.notice{font-size:13px!important;padding:20px;background:#e9eef4;border-left:3px solid var(--accent);border-radius:0 10px 10px 0;margin:28px 0}.article-meta{color:var(--muted);font-size:12px}.narrow{max-width:780px;margin-bottom:70px}.calculator{display:grid;grid-template-columns:1.15fr 1fr;gap:32px;align-items:start;margin:15px 0 65px}.calc-form{background:white;border:1px solid var(--line);border-radius:20px;padding:30px}.calc-form fieldset{border:0;padding:0;margin:0 0 28px;min-width:0}.calc-form legend{font-size:18px;font-weight:700;margin-bottom:20px}.fields{display:grid;grid-template-columns:1fr 1fr;gap:18px}.field label{font-size:13px;font-weight:650;display:block;margin-bottom:6px}.field input{width:100%;border:1px solid #788594;border-radius:8px;background:#fbfcfe;padding:11px 12px;color:var(--ink);min-width:0}.field small{display:block;color:var(--muted);font-size:11px;margin-top:5px}.calc-result{background:var(--charcoal);color:white;padding:30px;border-radius:20px}.calc-result h2{font-size:27px}.calc-result p{font-size:14px;color:#e2e8f0}.result-row{display:flex;justify-content:space-between;gap:15px;border-top:1px solid #ffffff30;padding:17px 0;font-size:14px}.result-row strong{font-size:23px;white-space:normal;overflow-wrap:anywhere;text-align:right;min-width:0}.result-title{color:var(--orange)!important;font-size:21px!important;font-weight:700}.calc-result .formula{font-size:12px;color:#d6dee8}.error{color:#b32921;font-size:13px}.hidden,[hidden]{display:none!important}details{border-top:1px solid var(--line);padding:20px 0}summary{cursor:pointer;font-weight:650}details p{margin:15px 0 0;font-size:14px;color:var(--muted)}.filter-bar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:25px}.filter{min-height:44px;padding:8px 15px;border:1px solid var(--line);border-radius:30px;background:transparent;cursor:pointer;font-size:12px;color:var(--ink)}.filter:hover{background:#e7ecf2;border-color:#788594}.filter[aria-pressed=true]{background:var(--accent);color:white;border-color:var(--accent)}.filter[aria-pressed=true]:hover{background:var(--accent-hover)}.calc-promo .button:hover{background:#ffb373;color:var(--ink)}.calc-promo a:focus-visible{outline-color:#ffb373}.calc-result .eyebrow:before{background:var(--orange)}.button:active{filter:brightness(.9)}.empty{padding:30px}svg{vertical-align:middle} @media(max-width:900px){.hero{gap:26px;padding-top:50px}.hero h1{font-size:48px}.nav{gap:18px}.cards{grid-template-columns:repeat(2,1fr)}.article-layout{grid-template-columns:minmax(0,1fr);gap:25px}.article-layout aside{max-width:700px}.calculator{gap:20px}.calc-form,.calc-result{padding:22px}.fields{grid-template-columns:1fr}.hero-art{aspect-ratio:.95}.art-caption{left:14px;right:14px}.principle span{font-size:11px}.calc-promo{padding:32px;gap:25px}}@media(max-width:640px){.wrap{width:calc(100% - 36px)}.header-row{min-height:110px;flex-wrap:wrap;gap:15px;padding:18px 0}.brand{font-size:18px}.brand-mark{width:34px;height:34px}.brand small{font-size:9px}.nav{width:100%;justify-content:space-between;gap:8px;font-size:12px}.nav .nav-cta{padding:10px 0;border:0}.nav a{min-height:44px;display:flex;align-items:center}.hero{grid-template-columns:1fr;padding:40px 0 30px;gap:30px}.hero h1{font-size:46px;letter-spacing:-2px;max-width:480px}.hero p{font-size:16px}.hero-art{aspect-ratio:1.24;max-height:370px}.hero-note{margin-bottom:0}.principles{grid-template-columns:1fr;gap:16px}.principle span{font-size:12px}.section{padding:46px 0}.section-top{align-items:start;flex-direction:column;gap:10px}h2{font-size:29px}.cards{grid-template-columns:1fr;gap:14px}.card{padding:23px}.card-top{margin-bottom:18px}.card h3{font-size:22px}.card p{font-size:14px}.calc-promo{grid-template-columns:1fr;padding:28px 24px;gap:25px}.calc-promo h2{font-size:30px}.mini-comparison{padding:20px}.steps{grid-template-columns:1fr;gap:20px}.step-number{margin-bottom:13px}.steps h3{margin-bottom:10px}.footer-top{flex-direction:column;gap:16px}.footer-links{gap:14px}.footer-bottom{gap:16px;flex-direction:column}.page-head{padding-top:36px}.page-head h1{font-size:35px;letter-spacing:-1px}.lead{font-size:17px}.calculator{grid-template-columns:1fr}.fields{grid-template-columns:1fr 1fr;gap:14px}.field label{font-size:12px}.article-layout{padding-top:0}.article-meta{font-size:11px}.button{padding:14px 18px;gap:12px}.calc-result{padding:25px}.narrow{margin-bottom:45px}}@media(max-width:360px){.fields{grid-template-columns:1fr}.hero h1{font-size:40px}.actions .button{width:100%}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}@media print{.header,.footer,.actions,.filter-bar{display:none}.wrap{width:100%}.article-layout,.calculator{display:block}.calc-result{color:black;background:white;border:1px solid}.calc-result p,.calc-result .result-title{color:black!important}}

/* Blog and contributor banner: same industrial palette. */
.submission-status{padding:25px;border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:14px;background:#eaf0f6;margin-bottom:35px}.submission-status .tag{display:block;margin-bottom:12px}.submission-status h2{margin-top:0}.blog-cards{grid-template-columns:repeat(2,1fr)}.nav{gap:22px}.footer-links{align-content:start}@media(max-width:640px){.nav{display:grid;grid-template-columns:1fr 1fr;gap:0 14px;font-size:12px}.nav a{justify-content:flex-start}.blog-cards{grid-template-columns:1fr}.submission-status{padding:20px}}

.article-photo{margin:0 0 34px}.article-photo img{display:block;width:100%;height:auto;border-radius:16px;background:#e8edf3}.article-photo figcaption{font-size:13px;line-height:1.6;color:var(--muted);padding:12px 2px 0}.photo-credit{display:block;font-size:11px;margin-top:7px}.article-photo+ h2{margin-top:28px}.prose p+.article-photo{margin-top:28px}

/* Featured photos share article assets; keep existing card layout and palette. */
.blog-cards .card-featured{display:block;width:100%;height:auto;aspect-ratio:3/2;object-fit:cover;object-position:center;border-radius:12px;margin-bottom:22px;background:#e8edf3}.blog-cards .card{min-width:0}

/* Native button + hidden navigation: no hidden links in the tab order. */
.nav-toggle{display:none;align-items:center;justify-content:center;gap:9px;min-width:88px;min-height:44px;padding:10px 12px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--ink);font-size:13px;font-weight:650;cursor:pointer}.nav-toggle:hover{border-color:var(--accent)}.menu-icon{display:grid;gap:4px;width:18px}.menu-icon span{display:block;height:2px;background:var(--accent);border-radius:2px}.nav-toggle[aria-expanded=true]{background:var(--charcoal);color:#fff}.nav-toggle[aria-expanded=true] .menu-icon span{background:var(--orange)}
@media(max-width:640px){.nav-enhanced .header-row{min-height:78px;gap:0 10px;padding:16px 0}.nav-enhanced .nav-toggle{display:inline-flex}.nav-enhanced .nav{flex-basis:100%;display:flex;flex-direction:column;align-items:stretch;gap:0;margin-top:16px;padding-top:10px;border-top:1px solid var(--line)}.nav-enhanced .nav a{padding:12px;min-height:46px;border-radius:8px;font-size:14px}.nav-enhanced .nav a:hover{background:#e7ecf2}.nav-enhanced .nav .nav-cta{color:var(--accent);gap:6px}}
@media print{.nav-toggle{display:none}}

@media(max-width:360px){.nav-enhanced .nav-toggle{min-width:44px;padding:12px}.nav-enhanced .nav-toggle>span:last-child{display:none}}