:root{--ink:#173133;--muted:#57676a;--teal:#075e63;--blue:#176ac7;--line:#d8dfdc;--paper:#fafbf8;--serif:Georgia,'Times New Roman',serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:80px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif;font-size:17px;line-height:1.65}a{color:inherit;text-underline-offset:5px}button,input{font:inherit}button,a,input{touch-action:manipulation}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:5px}.skip{position:fixed;left:15px;top:-100px;background:white;padding:12px;z-index:9}.skip:focus{top:15px}.nav{max-width:1440px;margin:auto;padding:25px 5%;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.wordmark{font-weight:800;text-decoration:none;letter-spacing:-1px;font-size:28px}.wordmark span{font-weight:400;letter-spacing:0;font-size:12px;padding-left:13px;text-transform:uppercase}.nav nav{display:flex;gap:27px;font-size:13px}.nav nav a{text-decoration:none}.nav nav a:hover{color:var(--teal)}main{max-width:1300px;margin:auto;padding:0 5%}.hero{padding:65px 0 48px}.eyebrow{display:flex;align-items:center;gap:20px;text-transform:uppercase;font-size:12px;font-weight:700;letter-spacing:1.5px}.venue{color:var(--blue);border:1px solid #c4d7eb;padding:5px 12px}.hero-layout{display:grid;grid-template-columns:1.7fr 1fr;gap:60px;align-items:center}h1{font-family:var(--serif);font-weight:400;font-size:clamp(36px,4.3vw,61px);line-height:1.12;letter-spacing:-1.9px;margin:30px 0 20px}h1 em{font-style:normal;color:var(--teal)}.lead{font-size:18px;max-width:490px;color:var(--muted)}.hero-aside{border-left:1px solid var(--line);padding-left:45px}.bft-mark{font-size:clamp(64px,8.5vw,130px);font-weight:800;letter-spacing:-9px;line-height:1;color:var(--teal)}.bft-mark span{display:block;font-family:var(--serif);font-size:26px;font-weight:400;line-height:1.2;letter-spacing:-.6px;margin:14px 0 26px}.hero-aside p{font-size:15px;color:var(--muted);max-width:300px}.authors{font-size:15px;line-height:1.85;max-width:1100px;margin-top:40px}.authors sup{font-size:10px;padding-left:2px}.affiliations{font-size:12px;color:var(--muted);line-height:1.85;margin-bottom:5px}.author-notes{font-size:11px;color:var(--muted);margin-top:0}.links{display:flex;gap:10px;flex-wrap:wrap;margin-top:28px}.links a{font-size:13px;display:flex;gap:35px;align-items:center;padding:12px 18px;border:1px solid var(--line);text-decoration:none;background:#fff}.links a:hover{border-color:var(--teal)}.links .primary{background:var(--teal);color:#fff;border-color:var(--teal)}.brand-row{display:flex;gap:35px;align-items:center;margin-top:40px}.brand-row img{object-fit:contain;max-width:230px;max-height:62px}.brand-row img:first-child{width:135px}.section{border-top:1px solid var(--line);padding:65px 0;display:grid;grid-template-columns:150px 1fr;gap:40px}.section-label{font-size:11px;text-transform:uppercase;letter-spacing:1.5px;color:var(--teal);padding-top:12px;font-weight:700}.section-content{min-width:0}h2{font-family:var(--serif);font-size:clamp(27px,3.3vw,42px);font-weight:400;letter-spacing:-1px;line-height:1.2;margin:0 0 24px}h3{font-size:20px;line-height:1.35;margin:0 0 16px;font-weight:600}p{margin:0 0 20px}.large{font-size:23px;line-height:1.5;letter-spacing:-.3px}.facts{display:grid;grid-template-columns:repeat(3,1fr);margin:38px 0 22px;gap:28px}.facts>div{border-top:2px solid var(--teal);padding-top:18px}.facts strong{font-family:var(--serif);font-weight:400;font-size:48px;line-height:1.2;color:var(--teal);letter-spacing:-2px}.facts strong span{font-family:Arial;font-size:17px;letter-spacing:0;padding-left:4px}.facts p{font-size:13px;color:var(--muted);margin:13px 0}.source-note{font-size:11px;color:var(--muted);line-height:1.6}.paper-figure{margin:35px 0}.zoom{display:block;width:100%;padding:0;border:0;background:#fff;cursor:zoom-in}.zoom img{display:block;width:100%;height:auto}figcaption{font-size:12px;line-height:1.65;color:var(--muted);margin-top:14px}.equation-grid{display:grid;grid-template-columns:1fr 1fr;gap:35px;margin:30px 0}.equation-grid>div{padding-top:24px;border-top:1px solid var(--line)}.equation-grid p{font-size:14px;color:var(--muted);margin-top:15px}.equation{font-family:var(--serif);font-size:20px;line-height:1.8;overflow-wrap:anywhere}.equation sub,.equation sup{font-size:12px}.objective{padding:20px 25px;background:#ecf3ef;border-left:3px solid var(--teal)}.objective>span{font-size:11px;letter-spacing:1px;text-transform:uppercase}.objective .equation{font-size:19px}.explorer{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-top:45px;border-top:1px solid var(--line);padding-top:30px}.explorer .eyebrow{font-size:10px;margin-bottom:10px}.explorer p{font-size:13px;color:var(--muted)}.explorer label{font-size:12px;display:flex;justify-content:space-between}.explorer output{font-weight:700}input[type=range]{width:100%;accent-color:var(--teal);margin:12px 0}.range-labels{display:flex;justify-content:space-between;color:var(--muted);font-size:10px}.weight-comparison{display:flex;flex-direction:column;justify-content:center;gap:22px}.weight-comparison>div{display:grid;grid-template-columns:85px 1fr 50px;gap:15px;align-items:center;font-size:12px}.weight-comparison b{text-align:right}.track{height:15px;background:#e1e7e4}.track i{display:block;height:100%;background:#a4b2b4;transition:width .15s}.bft-weight .track i{background:var(--teal)}.bft-weight{color:var(--teal)}.result-heading{display:flex;align-items:baseline;justify-content:space-between;gap:20px;margin-top:35px}.result-heading span{font-size:11px;color:var(--muted)}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;font-size:15px;white-space:nowrap}caption{text-align:left;color:var(--muted);font-size:12px;padding-bottom:12px}th,td{text-align:right;padding:14px 17px;border-bottom:1px solid var(--line)}th:first-child{text-align:left;padding-left:12px}thead th{font-size:11px;text-transform:uppercase;letter-spacing:.6px;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink)}tbody th{font-weight:400}.highlight{background:#edf4ef}.highlight th{font-weight:700}.positive{color:var(--teal)}.negative{color:#985245}.table-wrap+.source-note{margin-top:12px}.caveat{padding-left:20px;border-left:2px solid #bccdcc;color:var(--muted);font-size:13px}details{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:15px 0}summary{cursor:pointer;font-size:14px;color:var(--teal)}.resource-links{display:grid;grid-template-columns:1fr 1fr;gap:0 35px;margin-bottom:40px}.resource-links a{display:flex;justify-content:space-between;text-decoration:none;border-bottom:1px solid var(--line);padding:18px 0;font-size:14px}.resource-links a:hover{color:var(--teal)}pre{font-size:12px;line-height:1.8;background:#edf1ed;border:1px solid var(--line);padding:22px;overflow:auto;margin:0 0 30px}code{font-size:.9em}.bib-heading{display:flex;justify-content:space-between;align-items:center}.bib-heading button{border:1px solid var(--line);font-size:12px;background:white;padding:7px 13px;margin-bottom:15px}.contact{font-size:13px;color:var(--muted)}footer{border-top:1px solid var(--line);padding:35px 5%;max-width:1440px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:25px;font-size:11px;color:var(--muted)}footer p{margin:0}dialog{border:1px solid var(--line);padding:20px;width:min(96vw,1700px);max-width:96vw;max-height:94vh;background:white}dialog::backdrop{background:#082529c9}.dialog-bar{display:flex;align-items:center;justify-content:space-between;font-size:14px;margin-bottom:15px}.dialog-bar button{background:white;border:1px solid var(--line);padding:5px 14px;font-size:12px}dialog img{width:100%;display:block}@media(max-width:900px){.nav nav{gap:15px}.wordmark span{display:none}.hero-layout{gap:25px}.hero-aside{padding-left:25px}.section{grid-template-columns:1fr;gap:15px}.section-label{padding-top:0}.bft-mark{letter-spacing:-5px}.hero{padding-top:45px}}@media(max-width:600px){body{font-size:15px}.nav{padding:18px 5%}.nav nav{gap:12px;font-size:11px}.nav nav a:nth-child(3){display:none}.hero-layout{display:block}h1{font-size:38px;letter-spacing:-1.2px}.hero-aside{display:none}.hero .eyebrow{font-size:10px;gap:12px}.authors{font-size:13px;margin-top:30px}.affiliations{font-size:11px}.links a{font-size:11px;padding:10px 14px;gap:20px}.brand-row{gap:25px}.brand-row img{max-width:180px;max-height:52px}.brand-row img:first-child{width:110px}.section{padding:40px 0}.large{font-size:20px}.facts{gap:15px}.facts strong{font-size:34px}.facts strong span{font-size:12px}.facts p{font-size:11px}.equation-grid,.explorer{grid-template-columns:1fr;gap:20px}.equation{font-size:18px}.objective{padding:15px}.objective .equation{font-size:17px}.resource-links{grid-template-columns:1fr}.result-heading{display:block}.result-heading h3{margin-bottom:6px}th,td{padding:12px;font-size:13px}.result-heading span{display:block;margin-bottom:15px}footer{flex-wrap:wrap}footer p{order:3;width:100%}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.track i{transition:none}}