.app-frame{isolation:isolate;min-height:100vh;position:relative}.app-frame:before,.app-frame:after{z-index:-1;content:"";pointer-events:none;border-radius:999px;position:fixed}.app-frame:before{background:#15803d0d;width:19rem;height:19rem;top:22%;right:-8rem}.app-frame:after{background:#20a7b80d;width:16rem;height:16rem;bottom:-5rem;left:10rem}.side-rail{z-index:20;border-right:1px solid var(--border-strong);background:radial-gradient(circle at 25% 92%, #20a7b81a, transparent 9rem), radial-gradient(circle at 92% 8%, #15803d1a, transparent 10rem), var(--surface-glass);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);flex-direction:column;width:15.5rem;padding:1.35rem 1rem;display:flex;position:fixed;inset:0 auto 0 0;overflow-y:auto}.brand-link{border-radius:.9rem;padding:.35rem .45rem;text-decoration:none}.rail-nav{gap:.25rem;margin-top:2.2rem;display:grid}.rail-link{min-height:2.9rem;color:var(--ink-soft);border:1px solid #0000;border-radius:.85rem;align-items:center;gap:.8rem;padding:.7rem .8rem;font-weight:700;text-decoration:none;transition:background-color .18s,color .18s,border-color .18s;display:flex;position:relative}.rail-link:hover{background:var(--surface-soft);color:var(--indigo)}.rail-link[aria-current=page]{border-color:var(--border-strong);background:linear-gradient(135deg, var(--surface-soft), var(--surface-active));color:var(--indigo);box-shadow:0 4px #17211b0d}.rail-link[aria-current=page]:before{background:var(--violet);content:"";border-radius:99px;width:.3rem;height:1.7rem;position:absolute;left:-.45rem}.rail-bottom{gap:.7rem;margin-top:auto;display:grid}.side-rail .study-theme-menu{width:calc(13.5rem - 1px);inset:auto auto calc(100% + .55rem) 0}.beta-pill{border:1px solid color-mix(in srgb, var(--cyan) 36%, var(--border));background:linear-gradient(135deg, color-mix(in srgb, var(--cyan-soft) 72%, var(--surface)), var(--cyan-soft));color:var(--info-ink);border-radius:.75rem;align-items:center;gap:.55rem;padding:.7rem .85rem;font-size:.86rem;font-weight:800;display:flex;box-shadow:0 4px #087f9612}.beta-dot{background:var(--cyan);border-radius:99px;width:.55rem;height:.55rem}.app-main{overflow-wrap:anywhere;min-width:0;min-height:100vh;margin-left:15.5rem;padding:clamp(1.25rem,4vw,3.25rem)}.mobile-header,.mobile-nav{display:none}@media (max-width:800px){.side-rail{display:none}.app-main{padding:1.2rem max(1rem, env(safe-area-inset-right)) calc(6.5rem + env(safe-area-inset-bottom)) max(1rem, env(safe-area-inset-left));margin-left:0}.mobile-header{z-index:31;padding:max(.75rem, env(safe-area-inset-top)) max(1rem, env(safe-area-inset-right)) 0 max(1rem, env(safe-area-inset-left));flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.5rem;display:flex;position:relative}.mobile-header .brand-link{align-items:center;min-height:2.75rem;padding:0;display:flex}.mobile-header-actions{align-items:center;gap:.5rem;margin-left:auto;display:flex}.mobile-header-actions>a{border:1px solid var(--border-strong);background:var(--surface);width:2.75rem;height:2.75rem;color:var(--indigo);border-radius:.8rem;place-items:center;display:grid}.mobile-header-actions>a:hover,.mobile-header-actions>a[aria-current=page]{background:var(--surface-active);border-color:var(--violet)}.mobile-header .study-theme-menu{position:absolute;top:calc(100% + .55rem);right:0}.app-frame:before{width:min(19rem,60vw);right:0}.app-frame:after{width:min(16rem,60vw);left:0}.mobile-nav{z-index:30;border-top:1px solid var(--border);background:var(--surface-glass-strong);padding:.4rem max(.35rem, env(safe-area-inset-right)) calc(.4rem + env(safe-area-inset-bottom)) max(.35rem, env(safe-area-inset-left));-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);grid-template-columns:repeat(5,1fr);display:grid;position:fixed;inset:auto 0 0}.mobile-nav a{min-height:3.5rem;color:var(--ink-soft);border-radius:.7rem;align-content:center;place-items:center;gap:.15rem;font-size:.7rem;font-weight:750;text-decoration:none;display:grid}.mobile-nav a[aria-current=page]{background:var(--surface-soft);color:var(--indigo)}}