/* Selected Header C. Exact common + hybrid styling extracted from header-studies-r1.css. */
.hs-header,.hs-dialog {--hs-blue:#17647e;--hs-ink:#182326;--hs-paper:#fafaf7;--hs-muted:#586b73;--hs-rule:#d9e1e0}
.hs-header,.hs-header *,.hs-dialog,.hs-dialog *{box-sizing:border-box}
.hs-header{position:sticky;top:0;z-index:60;height:76px;padding:0;margin:0;color:var(--hs-ink);background:var(--hs-paper);font-family:-apple-system,BlinkMacSystemFont,'Helvetica Neue',Arial,sans-serif;isolation:isolate}
.hs-header .hs-inner{display:flex;align-items:center;height:100%;gap:32px;max-width:1600px;padding:0 4vw;margin:auto}
.hs-header a,.hs-dialog a{text-decoration:none;border:0;box-shadow:none;color:inherit}
.hs-header button,.hs-dialog button{font:inherit;cursor:pointer;letter-spacing:inherit;text-transform:none}
.hs-header .hs-brand{display:flex;width:92px;flex:0 0 92px;line-height:0;align-items:center;min-height:44px;padding:0}
.hs-header .hs-brand img{display:block;width:100%;height:auto;max-height:60px;margin:0}
.hs-header .hs-brand .hs-logo-dark{display:none}
.hs-header .hs-nav{display:flex;position:relative;align-items:center;justify-content:center;gap:30px;flex:1;align-self:stretch;min-width:0}
.hs-header .hs-group{display:flex;align-items:center;gap:24px;position:relative;height:100%}
.hs-header .hs-group-caption{display:none}
.hs-header .hs-link{display:flex;align-items:center;gap:7px;white-space:nowrap;min-height:44px;padding:0;color:var(--hs-ink);font-size:15px;line-height:1.2}
.hs-header .hs-link svg{width:19px;height:14px;flex:none;color:var(--hs-blue)}
.hs-header .nav-youtube-play{fill:var(--hs-paper)}
.hs-header .hs-tools{display:flex;align-items:center;gap:7px;flex:none}
.hs-header .hs-explore,.hs-header .hs-control{display:flex;align-items:center;justify-content:center;min-height:44px;border:0;padding:0;box-shadow:none;background:none}
.hs-header .hs-control{width:44px;height:44px;border-radius:50%;flex:none}
.hs-header .hs-tools svg{width:19px;height:19px;fill:none;stroke:currentColor}
.hs-header .hs-indicator{position:absolute;left:var(--indicator-x,0px);width:var(--indicator-width,0px);pointer-events:none}
.hs-header :is(a,button):focus-visible,.hs-dialog :is(a,button,input):focus-visible{outline:2px solid #27829c;outline-offset:4px}
.hs-header .hs-member-initials{font-size:12px;font-weight:650;letter-spacing:.02em}
.hs-header [hidden],.hs-dialog [hidden]{display:none!important}
/* C — editorial character with instrument precision */
.hs-header[data-concept=hybrid]{border-bottom:1px solid #cdd9dc;background:linear-gradient(100deg,#fafaf7 60%,#f2f6f4);box-shadow:0 3px 18px #244b5605}
.hs-header[data-concept=hybrid] .hs-inner{gap:clamp(28px,3.3vw,54px)}
.hs-header[data-concept=hybrid] .hs-nav{gap:32px;justify-content:center}
.hs-header[data-concept=hybrid] .hs-group{height:58px;margin-top:7px;gap:25px;padding-top:17px}
.hs-header[data-concept=hybrid] .hs-group-caption{display:block;position:absolute;left:0;top:4px;font-size:9px;line-height:1;letter-spacing:.13em;text-transform:uppercase;color:#65787d;font-weight:500}
.hs-header[data-concept=hybrid] .hs-primary .hs-link{font-size:16px;font-weight:600;letter-spacing:-.04em}
.hs-header[data-concept=hybrid] .hs-secondary{padding-left:27px;gap:22px}
.hs-header[data-concept=hybrid] .hs-secondary:before{content:'';position:absolute;left:0;top:9px;bottom:10px;width:1px;background:#d4dedd}
.hs-header[data-concept=hybrid] .hs-secondary .hs-group-caption{left:27px}
.hs-header[data-concept=hybrid] .hs-secondary .hs-link{font-size:14px;font-weight:500;letter-spacing:-.025em}
.hs-header[data-concept=hybrid] .hs-link:is(:hover,:focus-visible,[aria-current=page]){color:#17647e}
.hs-header[data-concept=hybrid] .hs-indicator{bottom:0;height:2px;background:#17647e;transition:left .3s cubic-bezier(.2,.7,.3,1),width .3s cubic-bezier(.2,.7,.3,1)}
.hs-header[data-concept=hybrid] .hs-indicator:before{content:'';position:absolute;left:calc(50% - 2px);top:-2px;width:4px;height:4px;background:#17647e;border-radius:50%}
.hs-header[data-concept=hybrid] .hs-explore{height:44px;padding:0 13px 0 17px;gap:12px;border-radius:24px;background:#17647e;color:#fff;font-size:12px;font-weight:600;box-shadow:inset 0 1px 0 #ffffff20,0 2px 3px #17415010;transition:background .2s}
.hs-header[data-concept=hybrid] .hs-explore:hover{background:#104b60}
.hs-header[data-concept=hybrid] .hs-explore svg{width:16px;height:16px;transition:transform .25s}
.hs-header[data-concept=hybrid] .hs-explore[aria-expanded=true] svg{transform:rotate(45deg)}
.hs-header[data-concept=hybrid] .hs-control{border:1px solid #d8e2e0;color:#254650;background:#ffffff75;transition:background .2s,border-color .2s}
.hs-header[data-concept=hybrid] .hs-control:is(:hover,[aria-expanded=true]){background:#e5f0f2;border-color:#a9c5ce}
/* A shared editorial index, with concept-specific accents. */
.hs-dialog{position:fixed;inset:88px 0 auto;margin:0 auto;padding:0;width:min(1120px,calc(100vw - 48px));max-width:none;max-height:calc(100dvh - 112px);border:1px solid var(--hs-rule);border-radius:3px;background:var(--hs-paper);color:var(--hs-ink);font-family:-apple-system,BlinkMacSystemFont,'Helvetica Neue',Arial,sans-serif;overflow:auto;box-shadow:0 28px 90px #15334033}
.hs-dialog::backdrop{background:#14282e5c;backdrop-filter:blur(7px);-webkit-backdrop-filter:blur(7px)}
.hs-dialog[open]{animation:hs-open .24s cubic-bezier(.2,.7,.3,1)}
.hs-dialog .hs-dialog-top{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:28px 34px 23px;border-bottom:1px solid var(--hs-rule)}
.hs-dialog .hs-eyebrow{display:block;color:var(--hs-blue);font-size:10px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;line-height:1.3}
.hs-dialog h2{font:400 35px/1.15 Georgia,'Times New Roman',serif;letter-spacing:-.035em;margin:8px 0 0;color:inherit}
.hs-dialog .hs-close{width:44px;height:44px;min-width:44px;padding:11px;border:1px solid var(--hs-rule);border-radius:50%;background:transparent;color:inherit;display:grid;place-items:center}
.hs-dialog .hs-close:hover{background:#17647e0a;border-color:#27829c}
.hs-dialog .hs-close svg{width:20px;height:20px}
.hs-dialog .hs-explore-grid{display:grid;grid-template-columns:1.38fr 1fr}
.hs-dialog .hs-menu-list{padding:8px 34px 12px}
.hs-dialog .hs-menu-link{display:grid;grid-template-columns:38px 1fr 20px;gap:18px;align-items:center;padding:16px 0;border-bottom:1px solid var(--hs-rule);color:inherit;min-height:72px}
.hs-dialog .hs-menu-link:last-child{border-bottom:0}
.hs-dialog .hs-menu-link strong{display:block;font:400 24px/1.2 Georgia,serif;letter-spacing:-.035em;color:inherit}
.hs-dialog .hs-menu-link small{display:block;font-size:11px;line-height:1.5;margin-top:5px;color:var(--hs-muted)}
.hs-dialog .hs-menu-icon svg{display:block;width:32px;height:32px;color:var(--hs-blue);transition:transform .25s}
.hs-dialog .hs-menu-arrow{font-size:19px;opacity:.35;transition:transform .2s,opacity .2s}
.hs-dialog .hs-menu-link:is(:hover,:focus-visible){color:var(--hs-blue)}
.hs-dialog .hs-menu-link:is(:hover,:focus-visible) .hs-menu-icon svg{transform:translateY(-2px) rotate(-3deg)}
.hs-dialog .hs-menu-link:is(:hover,:focus-visible) .hs-menu-arrow{opacity:1;transform:translate(2px,-2px)}
.hs-dialog .hs-menu-feature{margin:24px 25px 24px 0;border:1px solid #cddcde;background:radial-gradient(ellipse at 50% 30%,#fff 0%,#eff4f3 80%);padding:26px 28px;display:flex;flex-direction:column;align-items:flex-start;position:relative;overflow:hidden}
.hs-dialog .hs-menu-feature:after{content:'';position:absolute;inset:7px;border:1px solid #adc8ce40;pointer-events:none}
.hs-dialog .hs-feature-art{height:202px;width:100%;display:grid;place-items:center}
.hs-dialog .hs-feature-art img{display:block;max-width:100%;width:250px;max-height:210px;object-fit:contain;filter:drop-shadow(0 10px 9px #183e4c12);transition:transform .35s}
.hs-dialog .hs-feature-art>div{width:140px;color:#17647e}
.hs-dialog .hs-feature-art svg{width:140px;height:140px}
.hs-dialog .hs-menu-feature h3{font:400 33px/1.1 Georgia,serif;letter-spacing:-.04em;margin:12px 0;color:inherit}
.hs-dialog .hs-menu-feature p{font-size:13px;line-height:1.65;max-width:31ch;color:var(--hs-muted);margin:0 0 20px}
.hs-dialog .hs-menu-feature>a{font-size:12px;color:var(--hs-blue);display:flex;gap:20px;margin-top:auto;min-height:36px;align-items:center}
.hs-dialog .hs-menu-footer{display:flex;gap:25px;align-items:center;border-top:1px solid var(--hs-rule);padding:19px 34px;font-size:11px}
.hs-dialog .hs-menu-footer>span{margin-left:auto;color:var(--hs-muted);font:italic 14px Georgia,serif}
.hs-search-dialog{width:min(740px,calc(100vw - 48px))}
.hs-dialog .hs-search-form{margin:26px 34px 0;padding:12px 0;display:flex;gap:16px;align-items:center;border-bottom:1px solid #17647e}
.hs-dialog .hs-search-form>svg{width:24px;height:24px;color:var(--hs-blue);flex:none}
.hs-dialog .hs-search-form input{width:100%;min-width:0;padding:0;font:400 23px/1.5 Georgia,serif;border:0;border-radius:0;box-shadow:none;background:transparent;color:inherit;outline-offset:6px}
.hs-dialog .hs-search-form kbd{color:var(--hs-muted);font-size:16px}
.hs-dialog .hs-search-count{font-size:11px;color:var(--hs-muted);margin:17px 34px 4px}
.hs-dialog .hs-results{padding:0 34px 25px;min-height:90px}
.hs-dialog .hs-result{display:grid;grid-template-columns:1fr 20px;gap:6px 20px;padding:17px 0;border-bottom:1px solid var(--hs-rule)}
.hs-dialog .hs-result span:first-child{grid-column:1;font-size:9px;text-transform:uppercase;letter-spacing:.09em;color:var(--hs-blue)}
.hs-dialog .hs-result strong{grid-column:1;font-size:17px;font-weight:500;line-height:1.3;letter-spacing:-.02em}
.hs-dialog .hs-result span:last-child{grid-column:2;grid-row:1/3;align-self:center;color:var(--hs-blue)}
.hs-dialog .hs-result:hover strong{color:var(--hs-blue)}
.hs-account-dialog{width:330px;inset:88px 4vw auto auto;margin:0}
.hs-account-dialog .hs-dialog-top{padding:20px;gap:10px}
.hs-account-dialog h2{font-size:24px;margin:0}
.hs-account-dialog .hs-guest-actions,.hs-account-dialog .hs-member-actions{padding:0 20px 20px}
.hs-account-dialog p{font-size:12px;color:var(--hs-muted);line-height:1.6;margin:15px 0}
.hs-account-dialog :is(.hs-guest-actions,.hs-member-actions)>:is(a,button){display:flex;justify-content:space-between;align-items:center;gap:10px;width:100%;font-size:13px;min-height:46px;padding:12px 0;background:none;color:inherit;border:0;border-bottom:1px solid var(--hs-rule)}
.hs-account-dialog .hs-guest-actions>.hs-account-primary{background:#17647e;color:#fff;border:0;padding:12px 15px;border-radius:2px;margin-bottom:5px}
.hs-explore-dialog{border-top:3px solid #17647e}
@keyframes hs-open{from{opacity:0;transform:translateY(-9px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:1250px){.hs-header[data-concept=hybrid] .hs-inner{gap:25px;padding-inline:3vw}.hs-header[data-concept=hybrid] .hs-nav{gap:22px}.hs-header[data-concept=hybrid] .hs-group{gap:18px}.hs-header[data-concept=hybrid] .hs-secondary{padding-left:20px;gap:18px}.hs-header[data-concept=hybrid] .hs-secondary .hs-group-caption{left:20px}.hs-header[data-concept=hybrid] .hs-primary .hs-link{font-size:15px}.hs-header[data-concept=hybrid] .hs-secondary .hs-link{font-size:13px}}
@media(max-width:1100px){.hs-header[data-concept=hybrid] .hs-nav{display:none}.hs-header .hs-tools{margin-left:auto}}
@media(max-width:1050px){.hs-header .hs-nav{display:none}}
@media(max-width:700px){.hs-header{height:68px}.hs-header .hs-inner,.hs-header[data-concept=hybrid] .hs-inner{padding-inline:20px;gap:12px}.hs-header .hs-brand{width:88px;flex-basis:88px}.hs-header .hs-tools{gap:4px}.hs-dialog{inset:76px 0 auto;width:calc(100vw - 20px);max-height:calc(100dvh - 90px)}.hs-dialog .hs-dialog-top{padding:22px 22px 18px;gap:12px}.hs-dialog h2{font-size:28px}.hs-dialog .hs-explore-grid{grid-template-columns:1fr}.hs-dialog .hs-menu-list{padding:4px 22px 6px}.hs-dialog .hs-menu-feature{display:none}.hs-dialog .hs-menu-link{min-height:72px;padding:13px 0;gap:14px}.hs-dialog .hs-menu-link strong{font-size:23px}.hs-dialog .hs-menu-footer{padding:17px 22px;gap:8px 22px;flex-wrap:wrap}.hs-dialog .hs-menu-footer>span{width:100%;margin:10px 0 0}.hs-dialog .hs-search-form{margin:22px 22px 0;gap:10px}.hs-dialog .hs-search-form input{font-size:19px}.hs-dialog .hs-search-count{margin-inline:22px}.hs-dialog .hs-results{padding-inline:22px}.hs-account-dialog{inset:76px 10px auto auto;width:300px}}
@media(max-width:360px){.hs-header .hs-inner,.hs-header[data-concept=hybrid] .hs-inner{padding-inline:15px;gap:8px}.hs-header .hs-tools{gap:0}.hs-header[data-concept=hybrid] .hs-explore{padding-inline:12px;gap:6px}.hs-dialog h2{font-size:25px}}
html[data-theme=dark] .hs-header,html[data-theme=dark] .hs-dialog{--hs-ink:#eef3f1;--hs-paper:#182326;--hs-muted:#b4c3c5;--hs-rule:#3a4d54;--hs-blue:#81c5d9}
html[data-theme=dark] .hs-header .hs-brand .hs-logo-light{display:none}
html[data-theme=dark] .hs-header .hs-brand .hs-logo-dark{display:block}
html[data-theme=dark] .hs-header[data-concept=hybrid]{background:linear-gradient(100deg,#182326,#1e3036);border-color:#3a4d54}
html[data-theme=dark] .hs-header[data-concept=hybrid] .hs-link{color:#eef3f1}
html[data-theme=dark] .hs-header[data-concept=hybrid] .hs-link:is(:hover,:focus-visible,[aria-current=page]){color:#81c5d9}
html[data-theme=dark] .hs-header[data-concept=hybrid] .hs-group-caption{color:#a3b8bd}
html[data-theme=dark] .hs-header[data-concept=hybrid] .hs-control{color:#b3d6df;background:#253a41;border-color:#47616b}
html[data-theme=dark] .hs-dialog .hs-menu-feature{background:radial-gradient(ellipse at 50% 25%,#2b4146,#1c3036);border-color:#48636b}
@media(prefers-reduced-motion:reduce){.hs-header *,.hs-dialog *{transition:none!important;animation:none!important}.hs-dialog[open]{animation:none}}
/* Native submit preserves the approved return-arrow treatment. */
.hs-dialog .hs-search-submit{color:var(--hs-muted);font-size:16px;border:0;background:none;padding:0;flex:none;min-width:24px;min-height:44px}
.hs-dialog [data-account-status]{margin:12px 0 0;color:var(--hs-muted)}