.study-session-active{display:flex;flex-direction:column;min-height:100svh;background:var(--blue-soft);color:var(--ink)}.study-session-hud{position:sticky;top:0;z-index:10;border-bottom:1px solid var(--line);background:var(--canvas)}.study-session-bar-inner{width:min(920px,100% - 48px);margin-inline:auto;display:flex;align-items:center;gap:24px}.study-session-stage{flex:1;width:min(920px,100% - 48px);margin-inline:auto;padding-block:24px;min-width:0}.study-session-question{padding:clamp(20px,3vw,32px);border:1px solid var(--line);border-radius:var(--radius);background:var(--canvas);box-shadow:var(--shadow)}.study-session-actionbar{position:sticky;bottom:0;z-index:10;margin-top:auto;padding-block:14px;padding-bottom:max(14px,env(safe-area-inset-bottom));border-top:1px solid var(--line);background:var(--canvas)}@media(max-width:640px){.study-session-bar-inner,.study-session-stage{width:calc(100% - 24px)}.study-session-stage{padding-block:12px}.study-session-question{padding:16px;border-radius:18px}}.study-layout{min-height:60vh;padding-bottom:40px;background:radial-gradient(ellipse at 8% 0,#e8f1ff 0,transparent 46%),radial-gradient(ellipse at 100% 30%,#eef8f7 0,transparent 40%),#f7f9fd;color:var(--ink)}.study-layout:not(:has([data-practice-session=active])){--muted:#596981;--blue:#2b5fd9}.study-navigation{display:flex;align-items:center;gap:24px;width:min(1160px,100% - 48px);margin-inline:auto;padding-block:14px;border-bottom:1px solid var(--line)}.study-brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;min-width:0;max-width:100%;overflow-wrap:anywhere;color:var(--ink);font-size:1.125rem;font-weight:750;letter-spacing:-.025em;text-decoration:none;min-height:44px}.study-brand strong{color:var(--blue)}.study-brand>span:last-child{min-width:0}.study-brand-mark{display:grid;place-items:center;width:40px;height:40px;flex-shrink:0;border-radius:12px;color:var(--canvas);background:var(--blue);font-size:1.3rem}.study-navigation-links{display:flex;flex-wrap:wrap;gap:4px;margin-left:auto;min-width:0}.study-navigation-links a{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 12px;min-height:44px;border:1px solid transparent;border-radius:12px;color:var(--muted);font-size:.8125rem;font-weight:650;text-decoration:none}.study-navigation-links a:hover{color:var(--blue);background:var(--canvas)}.study-navigation-links a[aria-current=page]{color:#2859cb;background:var(--canvas);border-color:#d9e4fa;box-shadow:0 3px 10px rgba(38,55,88,.031372549);text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:6px}.study-navigation :is(a,summary):focus-visible{outline:3px solid var(--blue);outline-offset:3px}.study-layout:has([data-practice-session=active]){padding-bottom:0;background:var(--blue-soft)}.study-layout:has([data-practice-session=active]) .study-navigation{display:none}@media(max-width:1080px){.study-navigation{flex-wrap:wrap;gap:10px}.study-navigation-links{margin-left:0;flex-basis:100%}}@media(max-width:700px){.study-navigation{width:calc(100% - 32px);padding-block:12px}.study-brand{font-size:1rem}.study-brand-mark{width:34px;height:34px;font-size:1.125rem}.study-navigation-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));width:100%}.study-navigation-links a{gap:5px;padding:10px 5px;font-size:.75rem;overflow-wrap:anywhere}.study-navigation-links i{display:none}}@media(max-width:374px){.study-navigation-links{grid-template-columns:repeat(2,minmax(0,1fr))}}