/* V45 — focused learner experience */
.v45-study-nav{position:sticky;top:72px;z-index:30;display:flex;gap:8px;align-items:center;margin:10px 0 28px;padding:8px;border:1px solid rgba(255,255,255,.09);border-radius:16px;background:rgba(5,20,30,.92);backdrop-filter:blur(14px);box-shadow:0 12px 34px rgba(0,0,0,.16)}
.v45-study-nav a,.v45-study-nav button{appearance:none;border:0;background:transparent;color:inherit;text-decoration:none;padding:10px 14px;border-radius:11px;font:inherit;font-size:.84rem;cursor:pointer;opacity:.78}.v45-study-nav a:hover,.v45-study-nav button:hover,.v45-study-nav a:focus-visible,.v45-study-nav button:focus-visible{opacity:1;background:rgba(201,164,91,.1);outline:1px solid rgba(201,164,91,.3)}
.v45-lab-gate{display:grid;grid-template-columns:1fr auto;gap:22px;align-items:center;margin:34px 0 12px;padding:22px 24px;border:1px solid rgba(201,164,91,.22);border-radius:18px;background:rgba(255,255,255,.025)}.v45-lab-gate h2{margin:.2rem 0 .35rem;font-size:clamp(1.35rem,2.4vw,1.9rem)}.v45-lab-gate p{margin-bottom:0;max-width:760px}.study-lab.v45-collapsed{display:none}.study-lab.v45-open{display:block;animation:v45Reveal .24s ease-out}@keyframes v45Reveal{from{opacity:.2;transform:translateY(8px)}to{opacity:1;transform:none}}
.v45-focus-note{margin:12px 0 0;font-size:.78rem;opacity:.66}.v45-mobile-bar{display:none}
@media(max-width:780px){.v45-study-nav{top:auto;position:relative;overflow-x:auto;white-space:nowrap;scrollbar-width:none}.v45-study-nav::-webkit-scrollbar{display:none}.v45-lab-gate{grid-template-columns:1fr}.v45-lab-gate .app-button{width:100%}.v45-mobile-bar{position:fixed;display:grid;grid-template-columns:repeat(4,1fr);left:10px;right:10px;bottom:max(10px,env(safe-area-inset-bottom));z-index:90;padding:7px;border:1px solid rgba(255,255,255,.12);border-radius:16px;background:rgba(4,17,26,.96);backdrop-filter:blur(16px);box-shadow:0 16px 40px rgba(0,0,0,.38)}.v45-mobile-bar a,.v45-mobile-bar button{appearance:none;border:0;background:none;color:inherit;text-decoration:none;text-align:center;padding:8px 3px;font:inherit;font-size:.7rem;opacity:.82}.study-app{padding-bottom:82px}}