:root{--bg: #f6f8fb;--surface: #ffffff;--surface-soft: #f9fbfd;--text: #172033;--muted: #58657a;--border: #d9e2ec;--border-strong: #c4d0dd;--primary: #1f5fae;--primary-dark: #174983;--primary-soft: #eaf2fc;--success-soft: #eef8f2;--success-text: #21663d;--warn-soft: #fff8e8;--warn-border: #ead39a;--warn-text: #765516;--danger-soft: #fff1ef;--danger: #a23227;--shadow: 0 10px 28px rgba(29, 44, 68, .07);--radius: 14px;--shell: 1120px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:320px;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}img{max-width:100%;height:auto}a{color:var(--primary);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{color:var(--primary-dark)}button,input,select,textarea{font:inherit}button{cursor:pointer}[hidden]{display:none!important}h1,h2,h3,h4{margin:0 0 .7rem;color:var(--text);line-height:1.18;letter-spacing:-.025em}h1{font-size:clamp(2.1rem,4vw,3.25rem)}h2{font-size:clamp(1.55rem,2.4vw,2rem)}h3{font-size:1.15rem}p{margin:0 0 1rem}strong{font-weight:750}code{background:#f0f4f8;border:1px solid var(--border);border-radius:6px;padding:.1rem .35rem;font-size:.94em}.shell{width:min(calc(100% - 32px),var(--shell));margin-inline:auto}.narrow-shell{max-width:850px}.article-shell{max-width:900px}.skip-link{position:fixed;left:16px;top:10px;z-index:1000;padding:10px 14px;border-radius:8px;background:var(--text);color:#fff;transform:translateY(-160%)}.skip-link:focus{transform:translateY(0)}.site-header{position:sticky;top:0;z-index:30;background:#fffffff7;border-bottom:1px solid var(--border);backdrop-filter:blur(8px)}.header-inner{min-height:66px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--text);text-decoration:none;font-weight:800;font-size:1.05rem}.brand-mark{width:34px;height:34px;display:inline-grid;place-items:center;border-radius:9px;background:var(--primary);color:#fff;font-weight:800}.site-nav{display:flex;align-items:center;gap:8px}.site-nav a{padding:8px 10px;border-radius:7px;color:#354158;text-decoration:none;font-weight:650;font-size:.95rem}.site-nav a:hover{background:#f2f5f8;color:var(--text)}.site-nav a.active{color:var(--primary-dark);background:var(--primary-soft)}.home-intro{padding:58px 0 24px;background:var(--surface);border-bottom:1px solid var(--border)}.home-intro h1{margin-bottom:12px}.intro-lead{max-width:780px;font-size:clamp(1.08rem,2vw,1.25rem);color:#344158}.intro-note{margin:16px 0 0;color:var(--muted);font-size:.95rem}.calculator-wrap{padding:34px 0 46px}.calculator-grid{display:grid;grid-template-columns:minmax(0,1.03fr) minmax(0,.97fr);gap:22px;align-items:start}.card{background:var(--surface);border:1px solid var(--border-strong);border-radius:var(--radius);box-shadow:var(--shadow)}.form-card,.result-card{padding:clamp(22px,3vw,32px)}.card-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:22px}.simple-heading{margin-bottom:20px}.section-kicker,.result-kicker{display:block;margin-bottom:5px;color:var(--primary-dark);font-size:.78rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.card-heading h2{margin-bottom:0}.segmented{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:24px}.segmented button{min-height:48px;border:1px solid var(--border-strong);border-radius:9px;background:var(--surface);color:var(--text);font-weight:750}.segmented button small{margin-left:4px;color:var(--muted);font-size:.82rem;font-weight:600}.segmented button:hover{border-color:#9bb2cc;background:var(--surface-soft)}.segmented button.active{border-color:var(--primary);background:var(--primary);color:#fff}.segmented button.active small{color:#e7f0fb}.fieldset-reset{padding:0;margin:0;border:0;min-width:0}.field{margin-bottom:21px}.field label,.group-label{display:block;margin-bottom:8px;font-weight:750;color:var(--text)}.group-label{padding:0}.sex-options{display:grid;grid-template-columns:1fr 1fr;gap:10px}.sex-option{position:relative;display:block}.sex-option input{position:absolute;opacity:0;pointer-events:none}.option-pill{min-height:48px;display:grid;place-items:center;padding:10px 16px;border:1px solid var(--border-strong);border-radius:9px;background:var(--surface);color:var(--text);font-weight:750;cursor:pointer}.sex-option input:checked+.option-pill{border-color:var(--primary);background:var(--primary-soft);color:var(--primary-dark)}.sex-option input:focus-visible+.option-pill{outline:3px solid rgba(31,95,174,.2);outline-offset:2px}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:12px}.inline-inputs{display:grid;grid-template-columns:1fr 1fr;gap:8px}.input-wrap{position:relative}.input-wrap input{width:100%;min-height:50px;padding:11px 82px 11px 13px;border:1px solid var(--border-strong);border-radius:9px;background:#fff;color:var(--text);font-size:1rem;font-weight:650}.input-wrap input:focus{outline:3px solid rgba(31,95,174,.15);border-color:var(--primary)}.input-suffix{position:absolute;right:13px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:.88rem;font-weight:650;pointer-events:none}.field-help{margin:8px 0 0;color:var(--muted);font-size:.9rem;line-height:1.5}.advanced-panel{margin:4px 0 20px;border:1px solid var(--border);border-radius:10px;background:var(--surface-soft)}.advanced-panel summary{min-height:50px;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:12px 14px;cursor:pointer;font-weight:750}.advanced-panel summary span{color:var(--muted);font-size:.82rem;font-weight:650}.advanced-body{padding:4px 14px 14px;border-top:1px solid var(--border)}.check-row{display:grid;grid-template-columns:auto 1fr;gap:10px;align-items:start;padding:10px 0}.check-row input{margin-top:5px}.check-row strong{display:block}.check-row small{display:block;color:var(--muted);line-height:1.45;margin-top:2px}.context-divider{margin:10px 0 2px;padding-top:12px;border-top:1px solid var(--border);color:var(--muted);font-size:.82rem;font-weight:750;text-transform:uppercase;letter-spacing:.05em}.primary-btn{width:100%;min-height:52px;border:0;border-radius:9px;background:var(--primary);color:#fff;font-weight:800;font-size:1rem}.primary-btn:hover{background:var(--primary-dark)}.primary-btn:focus-visible{outline:3px solid rgba(31,95,174,.25);outline-offset:3px}.privacy-note{margin:10px 0 0;text-align:center;color:var(--muted);font-size:.86rem}.error{display:none;margin-top:12px;padding:11px 12px;border-radius:8px;background:var(--danger-soft);color:var(--danger);font-weight:650}.result-card{min-height:470px;position:sticky;top:88px}.empty-result{min-height:400px;display:flex;flex-direction:column;justify-content:center}.empty-result p{max-width:390px;color:var(--muted)}.result-value{margin-top:4px;color:var(--text);font-size:clamp(3.6rem,8vw,5.5rem);font-weight:800;line-height:.96;letter-spacing:-.06em}.result-unit{margin-top:8px;color:var(--text);font-size:1.15rem;font-weight:750}.result-note{margin-top:18px;color:var(--muted)}.result-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:22px}.mini-stat{padding:12px;border:1px solid var(--border);border-radius:9px;background:var(--surface-soft)}.mini-stat strong{display:block;font-size:1.15rem}.mini-stat span{color:var(--muted);font-size:.78rem;font-weight:650}.comparison-block,.warnings-block{margin-top:24px;padding-top:22px;border-top:1px solid var(--border)}.result-section-heading{display:flex;justify-content:space-between;gap:12px;align-items:baseline;margin-bottom:4px}.result-section-heading h3{margin:0}.result-section-heading a{font-size:.88rem;font-weight:700}.comparison-row{display:grid;grid-template-columns:1fr auto;gap:16px;align-items:center;padding:13px 0;border-bottom:1px solid var(--border)}.comparison-name{font-weight:750}.comparison-note{margin-top:3px;color:var(--muted);font-size:.86rem}.comparison-row>strong{white-space:nowrap}.comparison-row>strong small{color:var(--muted);font-weight:650}.formula-badge{display:inline-block;margin-left:5px;padding:3px 6px;border-radius:999px;background:var(--primary-soft);color:var(--primary-dark);font-size:.68rem;font-weight:800;text-transform:uppercase;letter-spacing:.04em}.microcopy{margin:12px 0 0;color:var(--muted);font-size:.82rem}.warning-list{display:grid;gap:8px}.warning-item{padding:11px 12px;border:1px solid var(--warn-border);border-radius:8px;background:var(--warn-soft);color:var(--warn-text)}.warning-item strong{display:block}.warning-item p{margin:3px 0 0}.warning-important{background:var(--danger-soft);border-color:#efc0ba;color:#782f28}.measurement-note{margin-top:20px;padding:13px;border-radius:9px;background:var(--success-soft);color:var(--success-text)}.measurement-note p{margin:4px 0 0;color:#3f6450}.result-reveal{animation:resultIn .22s ease both}@keyframes resultIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.seo-content{padding:20px 0 70px;background:var(--surface);border-top:1px solid var(--border)}.article-shell{display:grid;grid-template-columns:190px minmax(0,1fr);gap:40px;align-items:start}.on-page-nav{position:sticky;top:94px;display:grid;gap:8px;padding-top:30px}.on-page-nav strong{margin-bottom:2px}.on-page-nav a{color:var(--muted);text-decoration:none;font-size:.9rem}.on-page-nav a:hover{color:var(--primary)}.content-article{min-width:0}.content-article section{padding:30px 0;border-bottom:1px solid var(--border);scroll-margin-top:92px}.content-article section:last-child{border-bottom:0}.content-article p{color:#344158}.content-article h3{margin-top:1.5rem}.formula-box{margin:18px 0;padding:15px 17px;border:1px solid var(--border);border-radius:9px;background:var(--surface-soft)}.formula-box div+div{margin-top:5px}.formula-box small{display:block;margin-top:8px;color:var(--muted)}.simple-faq h3{margin-top:22px;margin-bottom:6px}.simple-faq p{margin-bottom:0}.more-link{margin-top:24px;font-weight:750}.source-box{background:var(--surface-soft);border-radius:10px;padding:24px!important;margin-top:12px}.content-page{padding:50px 0 70px}.prose{max-width:790px}.prose-wide{max-width:900px}.prose h1{margin-bottom:12px}.prose h2{margin-top:2.2rem;scroll-margin-top:90px}.prose h3{margin-top:1.6rem}.prose p,.prose li{color:#344158}.prose .lead{font-size:1.12rem;color:var(--muted)}.prose ul,.prose ol{padding-left:1.35rem}.prose li+li{margin-top:8px}.callout{margin:22px 0;padding:16px 18px;border-left:4px solid var(--primary);background:var(--primary-soft);border-radius:0 9px 9px 0}.callout p{margin:5px 0 0}.reference-list{display:grid;gap:12px}.reference-list li{padding:13px 14px;border:1px solid var(--border);border-radius:8px;background:var(--surface)}.faq-list{margin-top:24px;display:grid;gap:8px}.faq-item{border:1px solid var(--border);border-radius:9px;background:var(--surface)}.faq-item summary{padding:14px 16px;cursor:pointer;font-weight:750}.faq-item p{padding:0 16px 16px;margin:0}.source-cta{margin-top:26px;padding:16px;display:flex;justify-content:space-between;gap:20px;align-items:center;border:1px solid var(--border);border-radius:9px;background:var(--surface-soft)}.source-cta p{margin:3px 0 0}.button-link{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:9px 14px;border-radius:8px;text-decoration:none;font-weight:750}.primary-link{background:var(--primary);color:#fff}.primary-link:hover{background:var(--primary-dark);color:#fff}.secondary-link{border:1px solid var(--border-strong);background:#fff;color:var(--text)}.site-footer{padding:36px 0 18px;background:#132035;color:#dce5ef}.footer-grid{display:grid;grid-template-columns:1fr auto;gap:30px;align-items:start}.footer-brand{color:#fff}.footer-brand .brand-mark{background:#fff;color:#132035}.footer-grid p{max-width:520px;margin:12px 0 0;color:#bfcbd8}.footer-links{display:grid;grid-template-columns:repeat(2,auto);gap:8px 20px}.footer-links a{color:#dce5ef;text-decoration:none}.footer-links a:hover{color:#fff;text-decoration:underline}.footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:28px;padding-top:16px;border-top:1px solid rgba(255,255,255,.14);color:#aebdcb;font-size:.86rem}@media(max-width:900px){.calculator-grid{grid-template-columns:1fr}.result-card{position:static;min-height:0}.empty-result{min-height:220px}.article-shell{grid-template-columns:1fr;gap:0}.on-page-nav{position:static;display:flex;flex-wrap:wrap;gap:8px 14px;padding:24px 0 6px;border-bottom:1px solid var(--border)}.on-page-nav strong{width:100%}}@media(max-width:700px){.shell{width:min(calc(100% - 24px),var(--shell))}.header-inner{min-height:60px}.site-nav{gap:2px;overflow-x:auto}.site-nav a{padding:7px 8px;font-size:.86rem;white-space:nowrap}.brand>span:last-child{display:none}.home-intro{padding:38px 0 20px}.calculator-wrap{padding-top:24px}.form-card,.result-card{padding:20px}.two-col,.result-stats{grid-template-columns:1fr}.comparison-row{grid-template-columns:1fr;gap:6px}.comparison-row>strong{justify-self:start}.source-cta{flex-direction:column;align-items:flex-start}.footer-grid{grid-template-columns:1fr}.footer-bottom{flex-direction:column;gap:6px}}@media(max-width:460px){.segmented,.sex-options{grid-template-columns:1fr}.inline-inputs{grid-template-columns:1fr 1fr}.site-nav a:nth-child(2),.site-nav a:nth-child(3){display:none}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}