.concept-shell{--concept-gutter: clamp(1rem, 2.5vw, 2.25rem);min-block-size:100svh;overflow-wrap:anywhere;isolation:isolate}.concept-skip-link{position:fixed;z-index:100;top:var(--pp-space-3);left:var(--pp-space-3);padding:var(--pp-space-3) var(--pp-space-4);background:var(--pp-ink);color:var(--pp-surface);font-weight:650;text-decoration:none;transform:translateY(-150%)}.concept-skip-link:focus-visible{transform:translateY(0)}.concept-topbar,.concept-footer{width:min(100%,88rem);margin-inline:auto;padding-inline:var(--concept-gutter)}.concept-topbar{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:var(--pp-space-4);min-block-size:4.5rem;border-block-end:1px solid var(--pp-line)}.concept-topbar>*,.concept-footer>*{min-width:0}.concept-wordmark{color:var(--pp-ink);font-family:var(--pp-font-display);font-size:clamp(1.35rem,1.1rem + .5vw,1.7rem);letter-spacing:-.04em;text-decoration:none}.concept-switcher{min-width:0}.concept-switcher-track{display:flex;align-items:center;justify-content:center;gap:var(--pp-space-1);overflow-x:auto;overscroll-behavior-inline:contain;scrollbar-width:thin}.concept-switcher a{display:inline-flex;flex:0 0 auto;align-items:center;min-block-size:2.75rem;padding-inline:var(--pp-space-3);border-radius:var(--pp-radius-sm);color:var(--pp-ink-muted);font-size:var(--pp-text-sm);font-weight:580;text-decoration:none;white-space:nowrap}.concept-switcher a:hover,.concept-switcher a[aria-current=page]{color:var(--pp-ink);background:var(--pp-surface-sunken)}.concept-switcher a:focus-visible,.concept-wordmark:focus-visible,.concept-footer a:focus-visible,.concept-action:focus-visible{outline:2px solid var(--pp-focus);outline-offset:.2rem}.concept-theme-toggle{display:grid;place-items:center;min-inline-size:2.75rem;min-block-size:2.75rem}.concept-topbar .concept-theme-toggle .toggle{width:2.75rem;height:2.75rem}.concept-footer{display:flex;flex-wrap:wrap;justify-content:space-between;gap:var(--pp-space-3) var(--pp-space-5);padding-block:var(--pp-space-5);border-block-start:1px solid var(--pp-line);color:var(--pp-ink-faint);font-size:var(--pp-text-xs)}.concept-footer a{color:var(--pp-ink-muted)}.concept-action{display:inline-flex;align-items:center;justify-content:center;min-block-size:2.75rem;padding:var(--pp-space-2) var(--pp-space-4);border:1px solid currentColor;border-radius:var(--pp-radius-sm);font-size:var(--pp-text-sm);font-weight:650;text-decoration:none}.concept-action:hover{background:var(--pp-ink);color:var(--pp-surface)}.concept-layer{position:relative;isolation:isolate}.concept-layer>*{position:relative;z-index:1}.study-header{display:grid;grid-template-columns:minmax(9rem,.45fr) minmax(0,1.55fr);gap:var(--pp-space-5) clamp(var(--pp-space-5),5vw,var(--pp-space-8));width:min(100%,88rem);margin-inline:auto;padding:clamp(var(--pp-space-5),3vw,var(--pp-space-7)) var(--concept-gutter);border-block:1px solid var(--pp-line)}.study-brief-heading,.study-brief-details,.study-brief-details>div{min-inline-size:0}.study-brief-heading{display:grid;align-content:start;gap:var(--pp-space-2)}.study-brief-kicker,.study-brief-title,.study-brief-details,.study-brief-details dd{margin:0}.study-brief-kicker,.study-brief-details dt{color:var(--pp-ink-muted);font-size:var(--pp-text-xs);font-weight:650;letter-spacing:.04em}.study-header .study-brief-title{color:inherit;font-family:var(--pp-font-display);font-size:clamp(1.75rem,3vw,2.5rem);line-height:1;letter-spacing:-.035em}.study-brief-details{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--pp-space-5)}.study-brief-details>div{display:grid;align-content:start;gap:var(--pp-space-2)}.study-brief-details dt{line-height:1.35}.study-brief-details dd{max-inline-size:34ch;color:inherit;font-size:var(--pp-text-sm);line-height:1.55}.study-sections{display:flex;flex-wrap:wrap;grid-column:2;gap:var(--pp-space-2)}.study-sections a{display:inline-flex;align-items:center;min-block-size:2.75rem;min-inline-size:0;padding:var(--pp-space-2) var(--pp-space-3);border:1px solid var(--pp-line);border-radius:var(--pp-radius-sm);color:inherit;font-size:var(--pp-text-sm);font-weight:600;line-height:1.3;text-decoration:none}.study-sections a:hover{border-color:currentColor}.study-sections a:focus-visible{outline:2px solid var(--pp-focus);outline-offset:.2rem}.concept-bleed{width:100%;max-width:none}[data-motion-section]{--motion-progress: 0}@media(max-width:44rem){.concept-topbar{grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"brand theme" "switcher switcher";gap:0 var(--pp-space-3);padding-block:var(--pp-space-2)}.concept-wordmark{grid-area:brand}.concept-switcher{grid-area:switcher}.concept-switcher-track{justify-content:flex-start;margin-inline:calc(var(--concept-gutter) * -1);padding-inline:var(--concept-gutter)}.concept-theme-toggle{grid-area:theme}.study-header,.study-brief-details{grid-template-columns:minmax(0,1fr);gap:var(--pp-space-4)}.study-sections{grid-column:1}.study-sections a{flex:1 1 10rem}}