@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#172946;--muted:#536279;--line:#dce3eb;--blue:#1d4bb5;--paper:#fff;--pale:#f3f6fb}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Manrope,Arial,sans-serif;font-size:17px;line-height:1.7}a{color:inherit;text-decoration:none}a:focus-visible{outline:3px solid var(--blue);outline-offset:5px}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.16}header,section,footer{padding-inline:max(6vw,calc((100vw - 1320px)/2))}.header{height:96px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{font-weight:800;font-size:26px;letter-spacing:-1px}.brand span{color:var(--blue)}nav{display:flex;align-items:center;gap:38px;font-size:14px;font-weight:600}.nav-cta{padding:11px 18px;border:1px solid var(--line);border-radius:6px}.hero{display:grid;grid-template-columns:1.17fr 1fr;gap:70px;padding-block:84px 100px;align-items:center;min-height:680px}.eyebrow{display:block;font-size:13px;font-weight:800;letter-spacing:1.5px;color:var(--blue);margin-bottom:26px}h1{font-size:clamp(42px,4.65vw,72px);letter-spacing:-3px;line-height:1.1;font-weight:800;max-width:760px}h1 span{color:var(--blue);display:block}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:42px}.button{display:inline-flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;min-height:54px;padding:15px 24px;border-radius:6px;transition:background .18s,transform .18s}.button:hover{transform:translateY(-2px)}.primary{color:white;background:var(--blue)}.primary:hover{background:#163b91}.secondary{border:1px solid var(--line)}.secondary:hover{background:var(--pale)}.hero-panel{background:var(--ink);color:white;border-radius:10px;padding:32px 36px;box-shadow:0 24px 60px #17294612}.panel-top{display:flex;align-items:center;justify-content:space-between;color:#bccbe0;font-size:14px}.small-mark{font:30px Georgia,serif}.panel-title{font-size:clamp(26px,2.5vw,38px);line-height:1.3;font-weight:400;margin-block:38px}.panel-title strong{font-weight:700}.equation{display:flex;align-items:center;justify-content:space-between;gap:8px;border-block:1px solid #ffffff26;padding:24px 0;font-size:14px}.equation b{color:#82a8ff;font-size:22px}.panel-bottom{display:flex;justify-content:space-between;gap:20px;color:#bccbe0;font-size:12px;margin-top:25px}.section{padding-block:90px}.principles{background:var(--pale);border-block:1px solid var(--line)}.section-head{margin-bottom:52px}h2{font-size:clamp(32px,3.1vw,48px);letter-spacing:-1.8px;font-weight:800}.manifesto{display:grid;grid-template-columns:1fr 1.15fr;gap:90px}.manifesto p{margin-bottom:24px}.opening{font-size:19px;color:var(--muted);line-height:1.85}.opening .statement{font-size:26px;font-weight:800;color:var(--ink);line-height:1.4;margin-top:32px;border-left:3px solid var(--blue);padding-left:24px}.body-copy{font-size:17px;color:var(--muted);line-height:1.85}.body-copy strong{color:var(--ink);font-weight:800}blockquote{display:flex;align-items:baseline;justify-content:space-between;gap:24px;margin:48px 0 0;padding:34px 0 0;border-top:1px solid var(--line)}blockquote p{font-size:29px;line-height:1.3;letter-spacing:-1px}blockquote cite{font-size:14px;font-style:normal;color:var(--muted)}.formula-layout{display:grid;grid-template-columns:1fr 1.15fr;gap:90px}.formula-intro{background:var(--pale);border-radius:8px;padding:35px;display:flex;align-items:center;gap:32px}.formula-symbol{font:120px Georgia,serif;color:var(--blue);line-height:1}.formula-intro p{font-size:18px;line-height:1.75}.formula-items article{display:flex;gap:25px;padding:24px 0;border-top:1px solid var(--line)}.formula-items article:first-child{padding-top:0;border-top:0}.number{font-size:14px;font-weight:700;color:var(--blue)}h3{font-size:23px;letter-spacing:-.6px;font-weight:800}.formula-items p{color:var(--muted);font-size:16px;margin-top:13px}.formula-items .source-note{font-size:14px}.learning{background:var(--pale)}.section-description{margin-top:22px;font-size:19px;color:var(--muted)}.learning-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.learning-card{background:white;border:1px solid var(--line);border-radius:8px;padding:28px;display:flex;flex-direction:column}.card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:36px}.card-top svg{width:42px;height:42px;stroke:var(--blue);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}.learning-card h3{font-size:20px;line-height:1.4}.learning-card p{font-size:15px;line-height:1.75;color:var(--muted);margin-top:24px}.diagnostic{background:var(--ink);color:white;display:flex;align-items:center;justify-content:space-between;gap:40px;padding-block:64px}.diagnostic .eyebrow{color:#a7beee}.diagnostic h2{font-size:34px}.light{background:white;color:var(--ink);flex-shrink:0}footer{display:flex;justify-content:space-between;align-items:center;padding-block:32px;font-size:14px;color:var(--muted)}footer .brand{color:var(--ink);font-size:22px}@media(min-width:1700px){.hero{min-height:760px}}@media(max-width:1100px){.hero{gap:35px;padding-block:65px}.manifesto,.formula-layout{gap:40px}.learning-grid{grid-template-columns:repeat(2,1fr)}.formula-intro{padding:25px;gap:20px}.formula-symbol{font-size:90px}}@media(max-width:740px){header,section,footer{padding-inline:6vw}.header{height:80px}.brand{font-size:23px}nav{gap:12px}nav>a:first-child{display:none}.nav-cta{font-size:12px;padding:9px 12px}.hero{grid-template-columns:1fr;padding-block:48px 55px;gap:40px;min-height:auto}h1{font-size:44px;letter-spacing:-2px}.hero-actions{margin-top:30px}.button{font-size:14px;padding:14px 20px}.hero-panel{padding:26px}.panel-title{font-size:32px;margin-block:25px}.section{padding-block:55px}.section-head{margin-bottom:34px}.eyebrow{font-size:12px;margin-bottom:18px}h2{font-size:34px;letter-spacing:-1.3px}.manifesto,.formula-layout{grid-template-columns:1fr;gap:24px}.opening{font-size:17px}.opening .statement{font-size:23px}.body-copy{font-size:16px}blockquote{flex-direction:column;gap:15px;margin-top:25px;padding-top:25px}blockquote p{font-size:26px}.formula-intro{padding:25px}.formula-intro p{font-size:16px}.formula-items article:first-child{padding-top:24px;border-top:1px solid var(--line)}.learning-grid{gap:14px}.learning-card{padding:20px}.card-top{margin-bottom:24px}.learning-card h3{font-size:18px}.learning-card p{font-size:14px}.diagnostic{flex-direction:column;align-items:flex-start;gap:28px}.diagnostic h2{font-size:29px}footer{gap:20px;flex-wrap:wrap}footer>span{display:none}}@media(max-width:420px){h1{font-size:38px}.hero-actions{display:grid}.learning-grid{grid-template-columns:1fr}.learning-card{padding:26px}.learning-card h3{font-size:22px}.learning-card p{font-size:16px}.equation{font-size:12px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button{transition:none}.button:hover{transform:none}}
/* Requested page refinements */
.header nav{gap:14px}
.header nav a{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:11px 20px;border:1px solid var(--blue);border-radius:6px;background:var(--blue);color:#fff;line-height:1.5;transition:background .18s}
.header nav a:hover{background:#163b91;border-color:#163b91}
.principle-equation{margin-top:55px;padding:35px 0;color:var(--blue);font-family:Georgia,'Times New Roman',serif;font-size:clamp(40px,4.5vw,68px);line-height:1.5;letter-spacing:-1px}
.principle-equation sup{font-size:.55em;line-height:0;position:relative;vertical-align:baseline;top:-.65em}
footer{background:var(--blue);color:#fff;padding-block:38px}
footer .brand,footer .brand span{color:#fff}
footer a:hover{text-decoration:underline;text-underline-offset:5px}
@media(max-width:740px){.header{height:auto;min-height:80px;gap:14px;padding-block:16px;flex-wrap:wrap}.header nav{gap:8px;flex-wrap:wrap}.header nav a{font-size:12px;min-height:42px;padding:9px 12px}.principle-equation{margin-top:28px;padding-block:15px}}

/* Separate the navigation header from the first screen. */
.header{position:relative;z-index:1;background:#fff;border-bottom:3px solid var(--blue);box-shadow:0 8px 20px rgba(23,41,70,.09)}


button,input,textarea,select{font:inherit}button{cursor:pointer}.button.primary{border:0}.header nav .nav-cta{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:11px 20px;border:1px solid var(--blue);border-radius:6px;background:var(--blue);color:#fff;line-height:1.5;font-size:14px;font-weight:600}.header nav .nav-cta:hover{background:#163b91;border-color:#163b91}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #537fd9;outline-offset:3px}.modal-open{overflow:hidden}.diagnostic-modal{border:0;padding:0;width:min(930px,calc(100% - 40px));max-height:calc(100dvh - 48px);border-radius:16px;color:var(--ink);background:white;box-shadow:0 35px 100px #071a4859;overflow:auto}.diagnostic-modal::backdrop{background:#091c45b3;backdrop-filter:blur(5px)}.modal-shell{display:grid;grid-template-columns:290px 1fr}.modal-aside{background:var(--blue);color:white;padding:35px 30px;display:flex;flex-direction:column;justify-content:space-between;gap:50px}.modal-aside .brand{font-size:23px}.modal-kicker{font-size:12px;letter-spacing:2px;color:#c3d3f3;font-weight:700}.modal-aside p{font-size:38px;line-height:1.25;letter-spacing:-1.5px;margin-top:20px}.modal-aside p strong{font-weight:800}.modal-formula{font:32px Georgia,serif;margin-top:36px;padding-top:28px;border-top:1px solid #ffffff40}.modal-aside-note{font-size:14px;line-height:1.7;color:#e4ecfb}.modal-content{padding:38px;position:relative}.modal-close{position:absolute;right:17px;top:14px;border:0;background:#f0f3f8;width:38px;height:38px;border-radius:50%;font-size:28px;line-height:1;color:var(--ink)}.modal-close:hover{background:#e4eaf4}.modal-content .eyebrow{font-size:11px;margin:0 40px 14px 0;letter-spacing:1px}.modal-content h2{font-size:34px;letter-spacing:-1px}.modal-description{font-size:15px;color:var(--muted);line-height:1.6;margin-top:13px;margin-bottom:24px}.exam-field{border:0;padding:0;margin:0 0 18px}.exam-field legend,.form-field>label{font-size:14px;font-weight:700;margin-bottom:8px;display:block}.exam-options{display:grid;grid-template-columns:1fr 1fr;gap:12px}.exam-options label{position:relative}.exam-options input{position:absolute;width:1px;height:1px;opacity:0}.exam-options span{display:flex;justify-content:space-between;align-items:center;gap:10px;border:1px solid var(--line);border-radius:7px;padding:12px 15px;font-size:17px;font-weight:800;cursor:pointer}.exam-options small{font-size:13px;font-weight:500;color:var(--muted)}.exam-options input:checked+span{border-color:var(--blue);background:#edf2fc;color:var(--blue);box-shadow:inset 0 0 0 1px var(--blue)}.exam-options input:focus-visible+span{outline:3px solid #537fd9;outline-offset:3px}.form-field{margin-bottom:17px}.form-field input,.form-field select,.form-field textarea{width:100%;border:1px solid #cbd5e4;border-radius:7px;padding:12px 13px;color:var(--ink);background:#fff;font-size:14px;line-height:1.5;min-height:46px}.form-field textarea{resize:vertical;max-height:180px}.form-field input::placeholder,.form-field textarea::placeholder{color:#758299}.form-row{display:grid;grid-template-columns:1fr 1.15fr;gap:14px}.optional{font-size:12px;color:var(--muted);font-weight:400;float:right}.submit-diagnostic{width:100%;min-height:52px;font-size:15px}.mail-explainer{font-size:12px;color:var(--muted);line-height:1.6;margin-top:12px;text-align:center}.mail-fallback{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-top:13px;font-size:12px;flex-wrap:wrap}.mail-fallback button{padding:0;background:none;border:0;color:var(--blue);font-size:12px;text-decoration:underline;text-underline-offset:3px}.mail-fallback a{color:var(--muted)}.diagnostic-status:empty{display:none}.diagnostic-status{background:#edf2fc;padding:13px;border-radius:7px;font-size:13px;line-height:1.7;margin-top:15px}.copy-fallback{width:100%;min-height:140px;margin-top:12px;font-size:14px;padding:12px;border:1px solid var(--line);border-radius:7px}@media(max-width:740px){.header nav .nav-cta{font-size:12px;min-height:42px;padding:9px 12px}.diagnostic-modal{width:calc(100% - 24px);max-height:calc(100dvh - 24px);border-radius:12px}.modal-shell{grid-template-columns:1fr}.modal-aside{padding:20px 24px;gap:0}.modal-aside>div,.modal-aside-note{display:none}.modal-content{padding:26px 22px}.modal-close{top:12px;right:14px}.modal-content h2{font-size:30px}.form-row{grid-template-columns:1fr;gap:0}.modal-description{margin-bottom:20px}.mail-fallback{font-size:13px}.mail-fallback button{font-size:13px}}@media(prefers-reduced-motion:no-preference){.diagnostic-modal[open]{animation:modal-in .2s ease-out}@keyframes modal-in{from{opacity:0;transform:translateY(12px) scale(.99)}to{opacity:1;transform:translateY(0) scale(1)}}}
.subject-picker{position:relative}.subject-trigger{width:100%;display:flex;align-items:center;justify-content:space-between;gap:15px;min-height:48px;background:white;border:1px solid #cbd5e4;border-radius:7px;padding:12px 14px;color:var(--ink);font-size:14px;text-align:left}.subject-trigger svg{width:20px;height:20px;fill:none;stroke:var(--ink);stroke-width:1.7;transition:transform .15s}.subject-trigger[aria-expanded=true]{border-color:var(--blue);box-shadow:0 0 0 2px #1d4bb51a}.subject-trigger[aria-expanded=true] svg{transform:rotate(180deg)}.subject-options{position:absolute;top:calc(100% + 7px);left:0;right:0;background:white;border:1px solid #dce3eb;border-radius:10px;box-shadow:0 12px 30px #17294624;padding:6px;z-index:5}.subject-options[hidden]{display:none}.subject-options button{display:block;width:100%;background:white;border:0;border-radius:6px;padding:11px 13px;text-align:left;color:var(--ink);font-size:14px}.subject-options button:hover,.subject-options button:focus-visible{background:#edf2fc;color:var(--blue);outline:0}.subject-options button[aria-selected=true]{background:var(--blue);color:white;font-weight:700}.subject-options button[aria-selected=true]::after{content:'✓';float:right}.subject-error{font-size:13px;color:#b32632;margin-top:7px}.subject-trigger[aria-invalid=true]{border-color:#b32632}

.required-note{font-size:12px;color:var(--muted);margin-bottom:16px}.field-hint{font-size:12px;color:var(--muted);line-height:1.5;margin-top:6px}


.form-trap{position:absolute;left:-9999px;opacity:0;width:1px;height:1px;overflow:hidden}.submit-diagnostic:disabled{opacity:.7;cursor:wait}