:root{--ink:#132c35;--muted:#546b73;--teal:#126d76;--pale:#eaf3f3;--line:#d4e1e1;--paper:#fbfcfa;--serif:Georgia,'Times New Roman',serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:35px}body{margin:0;color:var(--ink);background:var(--paper);font:16px/1.65 system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}a{color:inherit;text-underline-offset:4px}a:hover{color:var(--teal)}button,input,select{font:inherit}button,a,input,select{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #bd680c;outline-offset:4px}img{max-width:100%;display:block;height:auto}h1,h2,h3,p{margin-top:0}h1,h2{font-family:var(--serif);font-weight:400;letter-spacing:-.045em;line-height:1.07}h1{font-size:clamp(43px,5.1vw,76px)}h2{font-size:clamp(31px,3.4vw,46px)}h3{font-size:22px;line-height:1.3;letter-spacing:-.035em}header,main,footer{max-width:1440px;margin:auto}header{height:100px;padding:0 5%;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{text-decoration:none;display:flex;align-items:center;font-weight:750;font-size:21px;letter-spacing:-1px;gap:10px}.brand-dot{color:var(--teal);margin-left:-8px}.mark{display:grid;place-items:center;width:36px;height:38px;background:var(--teal);color:white;clip-path:polygon(50% 0,100% 28%,100% 100%,0 100%,0 28%);font-family:var(--serif);font-size:24px}.mark span{display:none}header nav{display:flex;gap:34px;font-size:14px;font-weight:650}header nav a{text-decoration:none}.skip{position:absolute;left:10px;top:-90px;padding:12px;background:white;z-index:30}.skip:focus{top:10px}.eyebrow{display:block;font:700 11px/1.5 system-ui,sans-serif;text-transform:uppercase;letter-spacing:1.8px;color:var(--teal);margin-bottom:18px}.lead{font-size:19px;color:var(--muted);line-height:1.65;max-width:640px}.home-hero{display:grid;grid-template-columns:1fr 1fr;gap:5%;padding:58px 5% 56px}.hero-copy{padding:18px 0}.hero-copy h1{font-size:clamp(56px,6.7vw,94px);line-height:.98;margin:24px 0}.hero-copy .lead{max-width:390px}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:28px;background:var(--teal);border:1px solid var(--teal);color:#fff;padding:15px 22px;text-decoration:none;font-size:14px;font-weight:650;border-radius:4px}.button:hover{background:#0d535b;color:white}.hero-trust{font-size:11px;margin-top:28px;color:var(--muted)}.hero-photo{position:relative;border-radius:8px;overflow:hidden;min-height:530px}.hero-photo>img{height:100%;width:100%;object-fit:cover}.photo-label{position:absolute;left:24px;bottom:24px;right:24px;background:rgba(255,255,255,.94);padding:22px 26px;backdrop-filter:blur(8px);border-radius:3px}.photo-label .eyebrow{margin-bottom:9px}.photo-label strong{font-family:var(--serif);font-size:29px;font-weight:400;line-height:1.12;display:block}.photo-label a{font-size:12px;display:inline-block;margin-top:12px}.section{padding:60px 5%}.symptoms{padding:48px 5%;background:var(--pale);border-block:1px solid var(--line)}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:25px;margin-bottom:30px}.section-heading h2{margin:0}.section-heading p{margin-bottom:0;color:var(--muted);font-size:14px}.section-heading .eyebrow{margin-bottom:12px;color:var(--teal);font-size:11px}.section-heading>a{font-size:13px;white-space:nowrap}.symptom-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.symptom-grid>a{position:relative;border:1px solid #ccdddd;border-radius:4px;background:var(--paper);text-decoration:none;padding:23px;min-height:205px;transition:transform .2s,box-shadow .2s}.symptom-grid>a:hover{transform:translateY(-4px);box-shadow:0 8px 24px #173e3912}.number{font-family:var(--serif);font-size:26px;color:#56828b}.symptom-grid h3{font-size:19px;margin:21px 0 8px}.symptom-grid p{font-size:13px;line-height:1.5;color:var(--muted);max-width:170px}.arrow{position:absolute;right:18px;top:22px}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:27px}.guide-card{text-decoration:none;border-bottom:1px solid var(--line);display:flex;flex-direction:column;min-width:0}.guide-card>img{aspect-ratio:1.55;object-fit:cover;border-radius:5px}.card-body{padding:22px 0 25px;display:flex;flex:1;flex-direction:column}.card-body .eyebrow{font-size:10px;margin-bottom:12px}.card-body h3{font-family:var(--serif);font-size:27px;font-weight:400;line-height:1.16}.card-body p{font-size:14px;color:var(--muted);line-height:1.6}.read{display:flex;justify-content:space-between;margin-top:auto;padding-top:12px;font-size:12px;font-weight:650}.tool-feature{margin:20px 5%;padding:50px;background:#153942;color:#fff;border-radius:7px;display:grid;grid-template-columns:1.5fr 1fr;gap:60px}.tool-feature .eyebrow{color:#9bd1ce}.tool-feature p{color:#c8dada;max-width:550px}.tool-feature .button{background:#d4ede8;color:#163d40;border-color:#d4ede8}.math-preview{padding:28px;background:#214851;border:1px solid #42636a;border-radius:5px;display:flex;flex-direction:column;justify-content:center}.math-preview>span{font-size:11px;letter-spacing:1px}.math-preview strong{font-size:28px;font-weight:500;margin-top:16px}.math-preview em{font-size:17px;font-style:normal;color:#b8d4d3}.math-preview hr{width:100%;border:0;border-top:1px solid #557278;margin:22px 0}.math-preview b{font:70px var(--serif);color:#d4ede8}.math-preview small{font-size:12px;color:#c2d5d5}.topic-links{display:grid;grid-template-columns:repeat(3,1fr);gap:0 35px}.topic-links>a{padding:22px 0;border-bottom:1px solid var(--line);font-family:var(--serif);font-size:26px;text-decoration:none;display:flex;justify-content:space-between;align-items:center;gap:16px}.topic-links span{font:11px system-ui;color:var(--muted);white-space:nowrap}.editor-note{padding:65px 5% 75px;max-width:760px;margin:auto;text-align:center}.editor-note p{color:var(--muted)}.editor-note .eyebrow{color:var(--teal)}.editor-note a{font-size:13px}.page-heading{padding:65px 5% 30px;max-width:1050px}.page-heading h1{margin-bottom:24px}.article-head{max-width:1000px;padding:55px 5% 35px;margin:auto;text-align:center}.article-head h1{font-size:clamp(37px,4.5vw,62px)}.article-head .lead{margin:0 auto 22px;font-size:18px}.byline{font-size:12px;color:var(--muted)}.article-cover{margin:0 5% 48px}.article-cover>img{height:400px;width:100%;object-fit:cover;border-radius:5px}.article-cover figcaption{font-size:11px;color:var(--muted);margin-top:8px}.article-layout{display:grid;grid-template-columns:235px minmax(0,710px);gap:55px;max-width:1120px;margin:auto;padding:0 30px}.toc{align-self:start;position:sticky;top:30px;font-size:12px}.toc>a{display:block;padding:10px 0;border-bottom:1px solid var(--line);text-decoration:none}.toc .toc-tool{background:var(--pale);padding:16px;margin-top:20px;border:0;border-radius:4px}.prose{font-size:17px;line-height:1.85;min-width:0}.prose h2{font-size:31px;line-height:1.2;letter-spacing:-.035em;margin:40px 0 20px}.prose p{margin-bottom:21px}.section-number{font:12px system-ui;color:var(--teal);display:block;margin-bottom:10px;letter-spacing:2px}.quick-answer{padding:26px 30px;background:var(--pale);border-left:3px solid var(--teal)}.quick-answer p{font-size:19px;line-height:1.65;margin:0}.quick-answer .eyebrow{margin-bottom:10px}.inline-next{padding:15px 20px;background:#f0f4ed;font-size:14px}.process-figure{margin:40px 0}.process-figure img{width:100%;border-radius:5px}.process-figure figcaption{font-size:12px;color:var(--muted)}.sources{border-top:1px solid var(--line);font-size:14px;color:var(--muted)}.sources h2{font-size:25px;color:var(--ink)}.sources ul{padding-left:20px}.note{background:#f2eee5;padding:22px 25px;font-size:14px}.note p{margin:8px 0 0}.standalone{max-width:780px;margin:30px auto 70px;padding:0 30px}.calculator{margin:25px 5% 50px;display:grid;grid-template-columns:1fr 1fr;max-width:1050px;border:1px solid var(--line);border-radius:6px;overflow:hidden}.calculator form{padding:35px}.calculator label{display:block;font-size:13px;font-weight:650;margin-bottom:8px}input,select{padding:12px;border:1px solid #9bafb4;border-radius:3px;background:white;color:var(--ink);width:100%;min-width:0;min-height:47px}form input,form select{margin-bottom:21px}.input-row{display:flex;gap:12px}.input-row input{flex:1}.input-row select{width:145px}.result{padding:35px;background:var(--pale);display:flex;flex-direction:column;justify-content:center}.result output{font:clamp(30px,4vw,49px) var(--serif);line-height:1.2;display:block;margin:8px 0 24px}.result p{font-size:14px;color:var(--muted)}.small{font-size:12px!important}.two{grid-template-columns:1fr 1fr}.two .guide-card{padding:25px;border:1px solid var(--line);border-radius:5px}.two .guide-card h2{font-size:32px}.extra-tools{display:flex;gap:20px;margin:20px 5% 0;font-size:14px}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:14px}td,th{border:1px solid var(--line);padding:12px;text-align:left}th{background:var(--pale)}.log-table td{height:55px;min-width:90px}.print-button{margin-bottom:20px}.search-label{display:block;font-size:13px;font-weight:650;margin-bottom:10px}#guide-search{max-width:650px;font-size:17px;padding:18px}#search-count{font-size:12px;color:var(--muted);margin:10px 0 24px}.topic-pills{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:45px}.topic-pills a{border:1px solid var(--line);border-radius:30px;padding:8px 17px;font-size:12px;text-decoration:none}.guide-group{margin-bottom:60px}.guide-group>h2{font-size:37px;margin-bottom:25px}footer{padding:48px 5% 22px;background:#edf3f1;border-top:1px solid var(--line)}.footer-top{display:flex;justify-content:space-between;gap:45px}.footer-top p{font-size:13px;color:var(--muted);margin:10px 0}.footer-top nav{display:grid;grid-template-columns:repeat(3,1fr);gap:12px 30px;font-size:12px}.footer-top nav a{text-decoration:none}.footer-top button{padding:0;border:0;text-align:left;background:none;color:inherit;font-size:12px;text-decoration:underline}.footer-bottom{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);border-top:1px solid var(--line);padding-top:20px;margin-top:40px}.cookie{position:fixed;bottom:18px;left:18px;width:min(470px,calc(100% - 36px));z-index:20;background:white;border:1px solid var(--line);box-shadow:0 10px 50px #12323a25;border-radius:7px;padding:23px;font-size:13px}.cookie strong{font-size:15px}.cookie p{margin:8px 0 16px}.cookie-actions{display:flex;gap:10px;margin-top:15px}.cookie-actions button{padding:9px 14px;border:1px solid var(--teal);border-radius:3px;background:var(--teal);color:white;font-size:12px}.cookie-actions button+button{color:var(--teal);background:white}dialog{max-width:510px;border:1px solid var(--line);border-radius:8px;padding:32px;color:var(--ink)}dialog::backdrop{background:#0d263677}dialog h2{font-size:32px}dialog p{font-size:14px}[hidden]{display:none!important}@media(min-width:1500px){body{background:#edf1ee}header,main,footer{background:var(--paper)}}@media(max-width:900px){.home-hero{gap:28px}.hero-photo{min-height:450px}.hero-copy h1{font-size:65px}.symptom-grid{grid-template-columns:repeat(2,1fr)}.cards{gap:20px}.card-body h3{font-size:23px}.tool-feature{padding:35px;gap:30px}.topic-links{grid-template-columns:repeat(2,1fr)}.article-layout{grid-template-columns:190px minmax(0,1fr);gap:30px}.footer-top nav{grid-template-columns:repeat(2,1fr)}}@media(max-width:640px){header{height:78px}.brand{font-size:17px;gap:7px}.mark{width:29px;height:31px;font-size:20px}header nav{gap:17px;font-size:12px}.home-hero{grid-template-columns:1fr;padding-top:25px}.hero-copy{padding:0}.hero-copy h1{font-size:65px}.hero-copy h1 br:nth-child(2){display:none}.hero-copy .lead{font-size:17px}.hero-trust{margin-top:20px}.hero-photo{min-height:0;height:360px}.photo-label{left:16px;right:16px;bottom:16px;padding:17px 20px}.photo-label strong{font-size:24px}.section,.symptoms{padding:38px 5%}.section-heading{align-items:start;flex-direction:column;gap:14px}.section-heading h2{font-size:34px}.symptom-grid{gap:10px}.symptom-grid>a{padding:18px;min-height:200px}.symptom-grid h3{font-size:18px}.symptom-grid p{font-size:12px}.cards,.two{grid-template-columns:1fr}.guide-card>img{aspect-ratio:1.65}.card-body h3{font-size:29px}.tool-feature{grid-template-columns:1fr;padding:30px 24px;gap:25px}.tool-feature h2{font-size:34px}.math-preview{padding:24px}.topic-links{grid-template-columns:1fr}.editor-note{padding:45px 7%}.page-heading{padding-top:38px}.article-head{text-align:left;padding-top:35px}.article-head h1{font-size:39px}.article-head .lead{font-size:17px}.byline{font-size:11px}.article-cover{margin-bottom:28px}.article-cover>img{height:260px}.article-cover figcaption{font-size:10px}.article-layout{display:block;padding:0 6%}.toc{position:static;margin-bottom:30px;padding:20px;background:#f0f5f2}.toc>a{padding:9px 0}.toc .eyebrow{margin-bottom:10px}.prose{font-size:16px}.quick-answer{padding:22px}.quick-answer p{font-size:18px}.prose h2{font-size:29px}.calculator{grid-template-columns:1fr}.calculator form,.result{padding:25px}.extra-tools{flex-direction:column;gap:10px}.footer-top{flex-direction:column;gap:25px}.footer-top nav{grid-template-columns:repeat(3,1fr);gap:12px 15px}.footer-bottom{gap:20px}.footer-bottom span{max-width:160px;text-align:right}.cookie{font-size:12px;padding:18px}.topic-pills{gap:7px}.topic-pills a{padding:7px 12px}.standalone{padding:0 6%}.process-figure{margin:28px 0}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}@media print{header,footer,.cookie,.print-button,.skip{display:none!important}body{background:white;font-size:11px}main{max-width:none}.page-heading,.section{padding:10px 0}.page-heading h1{font-size:25px}.log-table td{height:33px}.log-table{font-size:10px}.log-table td,.log-table th{padding:7px}.table-wrap{overflow:visible}a{text-decoration:none}}
/* Keep article-specific imagery visible rather than cropping away its subject. */
.article-cover>img{height:auto;max-height:560px;object-fit:contain;background:var(--pale)}
/* Readability refinements */
.eyebrow,.card-body .eyebrow,.section-heading .eyebrow,.hero-trust,.topic-links span,.math-preview>span,.byline,.article-cover figcaption,.footer-bottom,.cookie-actions button,.footer-top nav,.footer-top button{font-size:12px}.card-body p,.symptom-grid p{font-size:16px}.read,.toc,.topic-pills a,.photo-label a,.extra-tools,.search-label,.calculator label{font-size:14px}.symptom-grid>a{min-height:220px}.unit-chip{white-space:nowrap;padding-top:12px;font-size:14px}.decision-table th{font-weight:600}.decision-table table{font-size:14px}.decision-table td{background:white}.article-cover figcaption{line-height:1.5}@media(max-width:640px){.symptom-grid p{font-size:14px}.symptom-grid>a{min-height:220px}.byline{font-size:12px}.footer-top nav{grid-template-columns:repeat(2,1fr)}}
/* Keep the three privacy controls usable on small screens and at high zoom. */
.cookie-actions{flex-wrap:wrap}dialog{max-height:90vh;overflow:auto}html{overflow-wrap:break-word}