@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--navy:#102b49;--navy2:#09213b;--blue:#175779;--ink:#18314a;--orange:#f29b38;--cream:#f6f4ef;--paper:#fffcf7;--line:#d6dce0;--muted:#5c6b78}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font-family:'DM Sans',Arial,sans-serif;font-size:16px;line-height:1.6}a{color:inherit}button{font:inherit}.wrap{width:min(1180px,calc(100% - 48px));margin:auto}.skip{position:absolute;left:-9999px;top:8px;background:white;color:#000;padding:8px;z-index:20}.skip:focus{left:8px}.site-header{background:var(--paper);border-bottom:1px solid #dbe1e1;position:relative;z-index:10}.header-inner{min-height:94px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:flex;align-items:center;text-decoration:none;gap:12px;min-width:0}.brand-mark{display:block;position:relative;flex:0 0 48px;width:48px;height:48px;background:var(--navy);border-radius:4px;overflow:hidden}.mark-stair{position:absolute;left:10px;bottom:15px;width:29px;height:21px;border-left:5px solid var(--orange);border-bottom:5px solid var(--orange);clip-path:polygon(0 48%,30% 48%,30% 25%,61% 25%,61% 0,100% 0,100% 25%,74% 25%,74% 49%,43% 49%,43% 75%,0 75%)}.mark-bar{position:absolute;left:9px;right:9px;bottom:9px;height:3px;background:#fff}.brand-name{font-family:Manrope,Arial,sans-serif;font-weight:700;letter-spacing:.045em;font-size:10px;line-height:1.35;max-width:135px;color:var(--navy)}.brand-name strong{display:block;font-size:15px;letter-spacing:-.035em;line-height:1.12;font-weight:800}.main-nav{display:flex;align-items:center;gap:27px}.main-nav a{text-decoration:none;font-weight:700;font-size:14px}.main-nav a:hover,.main-nav a:focus-visible{color:#b45a0a}.main-nav .nav-contact{border:1px solid var(--navy);padding:10px 17px;border-radius:2px;white-space:nowrap}.menu-toggle{display:none}.hero{background:var(--cream);overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;min-height:634px;gap:60px;align-items:center;padding:54px 0 65px}.hero-copy{padding:20px 0}.eyebrow,.section-index{font-family:Manrope,Arial,sans-serif;font-size:12px;font-weight:800;letter-spacing:.16em;text-transform:uppercase;line-height:1.5;color:#33617b}.eyebrow{display:flex;align-items:center;gap:12px}.eyebrow-line{width:27px;height:2px;background:var(--orange);flex:none}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-family:Manrope,Arial,sans-serif;letter-spacing:-.055em;line-height:1.12;color:var(--navy)}h1{font-size:clamp(3.3rem,5.2vw,5.4rem);font-weight:800;margin:27px 0}h1 em{font-style:normal;color:#bd6419}.hero-lede{font-size:19px;line-height:1.7;max-width:555px;color:#445a6a}.hero-actions{display:flex;align-items:center;flex-wrap:wrap;gap:25px;margin:32px 0 25px}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:34px;text-decoration:none;padding:14px 20px;border-radius:2px;font-weight:800;font-family:Manrope,Arial,sans-serif;font-size:14px;min-height:54px}.button-orange{background:var(--orange);color:var(--navy)}.button-orange:hover{background:#ffd08b}.text-link,.under-link{font-size:14px;font-weight:800;text-decoration:none;border-bottom:1px solid currentColor;padding-bottom:5px}.hero-note{font-size:13px;color:#6c7880;margin:0}.hero-art{height:500px;background:var(--navy);position:relative;overflow:hidden;color:#fff;border-radius:2px;box-shadow:18px 18px 0 #e1e7e5}.hero-art:before{content:"";position:absolute;inset:0;background:linear-gradient(125deg,transparent 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solid var(--orange);border-radius:50%}.node-one{left:8%;top:65%}.node-two{left:35%;top:49%}.node-three{left:60%;top:32%}.node-four{left:87%;top:15%}.art-caption{position:absolute;top:105px;left:35px;font-family:Manrope,Arial,sans-serif;font-weight:800;letter-spacing:-.04em;font-size:28px;line-height:1.15;max-width:210px;color:#fff}.ribbon{background:var(--orange);color:var(--navy)}.ribbon-inner{display:flex;align-items:center;gap:24px;min-height:84px}.ribbon-inner span:first-child{font-size:12px;letter-spacing:.15em;font-weight:800;white-space:nowrap}.ribbon-inner p{margin:0;font-family:Manrope,Arial,sans-serif;font-size:19px;font-weight:800;line-height:1.35}.ribbon-symbol{margin-left:auto;font-size:34px}.section{padding:103px 0}.two-col{display:grid;grid-template-columns:1fr .82fr;gap:100px}.section-index{margin-bottom:24px}h2{font-size:clamp(2.45rem,4vw,4.15rem);font-weight:800;margin:0}.purpose-right{padding-top:44px;color:#4b6171;font-size:18px;line-height:1.75}.purpose-right 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p{color:#4b5c68;font-size:16px;line-height:1.65}.card-foot{margin-top:auto;padding-top:18px;border-top:1px solid #dbe2e4;font-size:12px;text-transform:uppercase;letter-spacing:.13em;font-weight:800}.approach-section{background:var(--navy);color:#fff}.approach-section h2{color:#fff}.approach-section .section-index{color:#f4aa58}.approach-grid{display:grid;grid-template-columns:1fr .9fr;gap:100px}.approach-intro{font-size:18px;line-height:1.7;color:#c5d5dd;margin-top:24px}.steps{border-top:1px solid #53718a}.steps>div{display:grid;grid-template-columns:55px 115px 1fr;gap:14px;padding:22px 0;border-bottom:1px solid #53718a;align-items:start}.steps span{color:var(--orange);font-weight:800}.steps strong{font-family:Manrope,Arial,sans-serif;font-size:20px}.steps p{margin:0;color:#c5d5dd;font-size:15px;line-height:1.6}.resource-grid{display:grid;grid-template-columns:1fr .7fr;gap:100px;align-items:center}.resource-grid 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0}.connect-inner{display:flex;align-items:center;justify-content:space-between;gap:60px}.connect-section h2{color:#fff;max-width:730px}.connect-section p:not(.section-index){max-width:650px;font-size:18px;color:#deebef;margin:18px 0 0}.connect-section .section-index{color:#fbc58c}.button-light{color:var(--navy);background:#fff;white-space:nowrap}.button-light:hover{background:#f6d7ad}.footer{background:var(--navy2);color:#d5e2e9;padding:37px 0}.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:40px}.brand-footer .brand-name{color:#fff}.brand-footer .brand-mark{background:#214e6c}.footer-inner>div{text-align:right;font-size:13px}.footer-inner p{margin:3px 0}.footer a:hover{color:#fff}
@media(max-width:900px){.main-nav{gap:14px}.main-nav a{font-size:13px}.hero-grid{gap:35px}.hero-art{height:420px}.two-col,.approach-grid,.resource-grid{gap:50px}.steps>div{grid-template-columns:40px 1fr}.steps p{grid-column:2}.focus-card{padding:22px}}
@media(max-width:700px){.wrap{width:min(100% - 36px,540px)}.header-inner{min-height:78px}.brand-mark{width:42px;height:42px;flex-basis:42px}.brand-name{font-size:9px}.brand-name strong{font-size:13px}.menu-toggle{display:flex;gap:10px;align-items:center;background:transparent;border:1px solid var(--navy);color:var(--navy);padding:7px 10px;font-size:14px;font-weight:800}.main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--paper);padding:18px;border-bottom:1px solid var(--line);box-shadow:0 12px 20px #102b4920;flex-direction:column;align-items:stretch}.main-nav.open{display:flex}.main-nav a{padding:6px}.main-nav .nav-contact{padding:10px}.hero-grid{display:block;padding:56px 0 65px}.hero-copy{padding:0}.eyebrow{font-size:11px}.hero h1{font-size:clamp(2.8rem,12vw,4.7rem);margin:21px 0}.hero-lede{font-size:17px}.hero-art{height:370px;margin:38px 15px 0 0;box-shadow:12px 12px 0 #e1e7e5}.art-caption{font-size:24px}.ribbon-inner{gap:14px;padding:16px 0}.ribbon-inner p{font-size:16px}.ribbon-symbol{display:none}.section{padding:70px 0}.two-col,.approach-grid,.resource-grid{display:block}.purpose-right{padding-top:27px;font-size:17px}.section-head{display:block}.section-head>p{margin:20px 0 0}.cards{grid-template-columns:1fr;gap:12px}.focus-card{min-height:0;padding:25px}.card-icon{margin:15px 0}.approach-intro{margin-bottom:32px}.steps>div{grid-template-columns:42px 1fr}.quote-card{margin-top:30px;min-height:270px}.connect-inner{display:block}.connect-inner .button{margin-top:28px}.footer-inner{align-items:start;flex-direction:column;gap:25px}.footer-inner>div{text-align:left}h2{font-size:clamp(2.25rem,9vw,3.6rem)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.main-nav a[aria-current="page"]{color:#a8520c;border-bottom:2px solid var(--orange)}.link-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.link-card{background:var(--paper);min-height:276px;display:flex;flex-direction:column;text-decoration:none;padding:27px;border-top:4px solid var(--orange);transition:transform .2s,box-shadow .2s}.link-card:nth-child(2){border-color:var(--blue)}.link-card:nth-child(3){border-color:var(--navy)}.link-card:hover,.link-card:focus-visible{transform:translateY(-4px);box-shadow:0 13px 30px #102b491c}.link-card-title{font:800 25px/1.22 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h2:not(:first-child){margin-top:50px}.article p,.article li{font-size:17px;line-height:1.75;color:#405666}.article strong{color:var(--navy)}.article a{color:#0d617e;font-weight:700}.bangla-panel{background:#e7f0ee;border-left:5px solid var(--orange);padding:22px 25px;color:var(--navy)!important;font-size:18px!important;line-height:1.8!important}.definition-list{border-top:1px solid var(--line)}.definition-list>div{border-bottom:1px solid var(--line);padding:20px 0;display:grid;grid-template-columns:180px 1fr;gap:28px}.definition-list strong{font:800 18px/1.4 Manrope,Arial,sans-serif}.definition-list p{margin:0}.formula{background:var(--navy);padding:25px 27px;color:#fff;display:flex;flex-direction:column;gap:8px}.formula strong{color:var(--orange)}.formula span{font:800 20px/1.4 Manrope,Arial,sans-serif}.formula small{font-size:13px;color:#c8d9e1}.rich-list{padding-left:22px}.rich-list li{padding-left:8px;margin-bottom:12px}.article-source{font-size:14px!important;padding-top:23px;border-top:1px solid var(--line)}.side-panel{background:#e9eff0;padding:28px;position:sticky;top:25px}.side-panel h3{font-size:24px}.side-panel p{line-height:1.65;color:#4e6572}.side-panel .button{margin:8px 0 15px;display:flex;gap:10px}.side-panel hr{border:0;border-top:1px solid #c7d4d9;margin:19px 0}.tool-section{background:#eef2f2;padding:55px 0 90px}.tool-alert{background:#fff4dd;border-left:5px solid var(--orange);padding:18px 24px;margin-bottom:28px;color:#654817;line-height:1.6}.method-tabs{display:flex;gap:7px;flex-wrap:wrap}.method-tab{background:#dbe7ea;border:0;padding:14px 17px;color:var(--navy);font-weight:800;cursor:pointer;font-size:14px}.method-tab.active{background:#fff;border-top:4px solid var(--orange);padding-top:10px}.method-tab:hover{background:#f7fbfb}.calculator-shell{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(310px,.85fr);align-items:stretch;box-shadow:0 10px 40px #102b4914}.calculator-inputs{background:#fff;padding:38px}.method-panel h2,.method-notes h2{font-size:31px}.method-panel>p{font-size:16px;color:#516676}.field-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin:24px 0}.field-grid label{font-weight:700;font-size:14px;display:block;color:var(--navy);line-height:1.45}.field-grid input,.field-grid select,.filter-bar input{margin-top:8px;width:100%;min-height:46px;border:1px solid #aebfc6;background:#fff;border-radius:2px;padding:10px 12px;color:var(--navy);font:500 16px 'DM Sans',Arial,sans-serif}.field-grid input:focus,.field-grid select:focus,.filter-bar input:focus{outline:3px solid #f7c482;outline-offset:1px}.field-grid input::placeholder{color:#81929d}.calculator-inputs h3{font-size:22px;padding-top:25px;border-top:1px solid var(--line);margin:35px 0 0}.tiny{font-size:13px!important;line-height:1.65!important;color:#657785!important}.tiny a{color:#0b5b7a}.tool-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.button-outline{border:1px solid #8ba4b2;background:#fff;color:var(--navy);cursor:pointer;gap:8px}.button-outline:hover{background:#e9eff0}.result-panel{background:var(--navy);color:#fff;padding:42px 35px;min-height:390px}.result-eyebrow{font:800 12px Manrope,Arial,sans-serif;letter-spacing:.16em;color:var(--orange)}.result-panel h2{color:#fff;font-size:clamp(2.25rem,3.2vw,3.7rem);margin:25px 0 20px;overflow-wrap:anywhere}.result-panel p{color:#cadce4;line-height:1.7}.result-panel .result-title{color:#fff;font-weight:800}.result-panel .tiny{color:#acbfcb!important;margin-top:25px}.gap-box{border-top:1px solid #50718a;border-bottom:1px solid #50718a;padding:22px 0;display:flex;flex-direction:column;gap:8px;color:#fff}.gap-box strong{font:800 19px/1.4 Manrope,Arial,sans-serif}.gap-box span{font-size:14px;color:#c8d9e1}.method-notes{padding-top:64px}.method-note-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin:25px 0}.method-note-grid article{border-top:3px solid var(--orange);padding-top:20px}.method-note-grid h3{font-size:19px}.method-note-grid p{color:#4b6270}.resource-intro{display:grid;grid-template-columns:1fr 330px;gap:65px;align-items:start}.resource-intro h2{font-size:40px}.resource-intro p{color:#506571;line-height:1.7;font-size:17px}.resource-intro aside{background:#e9eff0;padding:24px;border-left:4px solid var(--orange)}.resource-intro aside p{font-size:15px;margin:9px 0 0}.filter-bar{margin:44px 0 16px;border-top:1px solid var(--line);padding-top:26px}.filter-bar label{display:block;font-weight:800;font-size:14px}.filter-bar input{max-width:480px}.filter-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.filter-chips button{border:1px solid #9ab0ba;border-radius:100px;padding:8px 16px;background:transparent;color:var(--navy);font:700 14px 'DM Sans',Arial,sans-serif;cursor:pointer}.filter-chips button.active,.filter-chips button:hover{background:var(--navy);color:#fff}.result-count{font-size:14px;color:#5a7080}.source-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-bottom:28px}.source-card{background:#edf2f2;padding:25px;display:flex;flex-direction:column;border-top:3px solid var(--orange);min-height:306px}.source-meta{display:flex;justify-content:space-between;gap:10px;color:#4f7283;font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.source-card h3{font-size:22px;margin:19px 0 2px}.source-card p{color:#526877;line-height:1.6;font-size:15px}.source-card .source-org{font-size:13px;font-weight:800;color:#aa5d16;margin:0 0 10px}.source-card a{font-size:14px;font-weight:800;color:#125e7b;margin-top:auto}.empty-results{background:#edf2f2;padding:25px}.practice-list{max-width:1050px}.practice-item{display:grid;grid-template-columns:225px 1fr;gap:60px;padding:43px 0;border-top:1px solid var(--line)}.practice-item:first-child{padding-top:0;border-top:0}.practice-num{font:800 45px/1 Manrope,Arial,sans-serif;color:var(--orange)}.practice-num span{display:block;font:800 12px/1.5 Manrope,Arial,sans-serif;letter-spacing:.1em;color:#4d7182;margin-top:17px}.practice-item h2{font-size:clamp(2rem,3vw,3rem);margin:0 0 18px}.practice-item h3{font-size:18px;letter-spacing:0;margin:20px 0 5px}.practice-item p{font-size:17px;color:#4a6070;line-height:1.7}.practice-item a{font-weight:800;color:#125e7b}
@media(max-width:1000px){.main-nav{gap:12px}.main-nav a{font-size:12px}.content-layout{gap:35px}.calculator-shell{grid-template-columns:1fr}.result-panel{min-height:270px}.source-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:700px){.link-grid,.source-grid,.method-note-grid{grid-template-columns:1fr}.link-card{min-height:220px}.page-hero{padding:62px 0}.page-hero p:last-child{font-size:17px}.content-layout,.resource-intro,.practice-item{display:block}.side-panel{position:static;margin-top:40px}.definition-list>div{display:block}.definition-list p{margin-top:8px}.calculator-inputs,.result-panel{padding:26px 20px}.field-grid{grid-template-columns:1fr}.method-tab{flex:1 1 100%}.tool-section{padding:30px 0 65px}.resource-intro aside{margin-top:25px}.practice-num{font-size:35px;margin-bottom:20px}.practice-item{padding:36px 0}.footer-inner{gap:15px}}
@media print{.site-header,.footer,.page-hero,.method-tabs,.tool-actions,.method-notes,.tool-alert{display:none!important}.tool-section{padding:0;background:#fff}.calculator-shell{display:block;box-shadow:none}.calculator-inputs{display:none}.result-panel{color:#111;background:#fff;padding:10px;min-height:0}.result-panel h2,.result-panel p,.result-panel .gap-box{color:#111}.result-panel .tiny{color:#333!important}}
.bangla-article,.bangla-article h2,.bangla-article strong,.bangla-article li,[lang="bn"] h1,[lang="bn"] p{font-family:'Noto Sans Bengali','Hind Siliguri',system-ui,sans-serif;letter-spacing:0}.bangla-article h2{line-height:1.35}.bangla-article p,.bangla-article li{line-height:1.9}.bangla-article .formula span{font-family:'Noto Sans Bengali','Hind Siliguri',system-ui,sans-serif;line-height:1.65}.main-nav a:last-child{font-family:'Noto Sans Bengali',system-ui,sans-serif}
.tool-bangla{font-family:'Noto Sans Bengali',system-ui,sans-serif;background:#e4eeef;border-left:4px solid #176283;padding:14px 20px;line-height:1.7;color:#244a5f}.method-note-grid{grid-template-columns:repeat(2,1fr)}@media(max-width:700px){.method-note-grid{grid-template-columns:1fr}}
.nav-dropdown{position:relative}.nav-dropdown summary{list-style:none;cursor:pointer;font-weight:700;font-size:14px;white-space:nowrap}.nav-dropdown summary::-webkit-details-marker{display:none}.nav-dropdown summary span{color:#aa5a12;margin-left:3px}.nav-dropdown.media-active summary,.nav-dropdown[open] summary{color:#a8520c}.nav-dropdown summary:hover{color:#a8520c}.nav-submenu{position:absolute;top:calc(100% + 22px);left:-19px;background:var(--paper);border-top:3px solid var(--orange);box-shadow:0 14px 25px #102b492b;min-width:160px;padding:10px;display:flex;flex-direction:column;z-index:12}.nav-submenu a{display:block;padding:9px 11px;font-size:14px!important}.nav-submenu a:hover,.nav-submenu a[aria-current="page"]{background:#e9eff0}.media-section{background:var(--paper)}.media-lead{display:grid;grid-template-columns:minmax(0,1fr) 180px;align-items:center;gap:70px}.media-lead h2{max-width:680px}.media-lead p:not(.section-index){font-size:18px;color:#506675;max-width:750px;line-height:1.7;margin:23px 0 0}.media-count{border-left:4px solid var(--orange);padding-left:20px}.media-count span{display:block;font:800 66px/1 Manrope,Arial,sans-serif;color:var(--navy);letter-spacing:-.08em}.media-count small{font-size:13px;color:#5c7180}.media-empty{display:grid;grid-template-columns:130px minmax(0,1fr);gap:36px;align-items:center;background:#e9eff0;border-top:4px solid var(--orange);padding:45px;margin-top:48px;min-height:245px}.empty-symbol{font:400 72px/1 Manrope,Arial,sans-serif;color:#276982;text-align:center}.play-symbol{font-size:93px}.media-empty h3{font-size:27px}.media-empty p{font-size:16px;color:#526776;max-width:610px;line-height:1.65}.media-empty .under-link{margin-top:3px}.media-bottom{margin-top:52px;border-top:1px solid var(--line);padding-top:30px}.media-bottom h3{font-size:23px}.media-topics{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0}.media-topics span{border:1px solid #afc2ca;padding:9px 15px;color:#365e71;font-size:14px;font-weight:700}.media-bottom p{font-size:13px;color:#687c89}
@media(max-width:1080px){.menu-toggle{display:flex;gap:10px;align-items:center;background:transparent;border:1px solid var(--navy);color:var(--navy);padding:7px 10px;font-size:14px;font-weight:800}.main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--paper);padding:18px max(24px,calc((100% - 1180px)/2));border-bottom:1px solid var(--line);box-shadow:0 12px 20px #102b4920;flex-direction:column;align-items:stretch;gap:9px}.main-nav.open{display:flex}.main-nav a{padding:6px}.main-nav .nav-contact{padding:10px}.nav-dropdown summary{padding:6px;font-size:14px}.nav-submenu{position:static;box-shadow:none;border:0;border-left:3px solid var(--orange);margin:4px 0 6px 13px;background:#edf2f2;min-width:0}.nav-submenu a{padding:7px 13px}}
@media(max-width:700px){.media-lead{display:block}.media-count{margin-top:30px}.media-count span{font-size:48px}.media-empty{display:block;padding:28px;margin-top:35px}.empty-symbol{text-align:left;font-size:55px;margin-bottom:17px}.play-symbol{font-size:75px}.media-bottom{margin-top:38px}}