body{font-family:Cairo,Tahoma,sans-serif;background-color:#070b14;color:#f1f5f9;overflow-x:hidden;padding-bottom:72px}@media(min-width:1024px){body{padding-bottom:0}}.glass-card{background:#0f172ac7;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.08)}.glass-header{background:#070b14e6;backdrop-filter:blur(16px);border-bottom:1px solid rgba(255,255,255,.08)}input[type=range]{-webkit-appearance:none;background:#1e293bf2;height:8px;border-radius:999px;outline:none}input[type=range].phys-slider::-webkit-slider-thumb{-webkit-appearance:none;width:22px;height:22px;border-radius:50%;background:#38bdf8;cursor:pointer;box-shadow:0 0 12px #38bdf8;border:2px solid #fff}.no-scrollbar::-webkit-scrollbar{display:none}.no-scrollbar{-ms-overflow-style:none;scrollbar-width:none}.ltr-math{direction:ltr;unicode-bidi:isolate;font-family:Courier New,Courier,monospace}*,*:before,*:after{box-sizing:border-box}html,body{margin:0}button,input,select,textarea{font:inherit}button{cursor:pointer}.hidden{display:none!important}#portalGate{position:fixed;inset:0;z-index:50;overflow-y:auto;padding:1rem;background:#050811}#portalGate:not(.hidden){display:flex;flex-direction:column;justify-content:space-between}@media(min-width:768px){#portalGate{padding:2rem}}.min-h-screen{min-height:100vh}.flex{display:flex}.flex-col{flex-direction:column}.flex-wrap{flex-wrap:wrap}.flex-1{flex:1 1 0%}.shrink-0{flex-shrink:0}.items-center{align-items:center}.justify-between{justify-content:space-between}.justify-center{justify-content:center}.grid{display:grid;gap:.75rem}.grid-cols-1{grid-template-columns:minmax(0,1fr)}.w-full{width:100%}.max-w-7xl{max-width:80rem;width:100%;margin-inline:auto}.max-w-6xl{max-width:72rem;width:100%;margin-inline:auto}.max-w-5xl{max-width:64rem;width:100%;margin-inline:auto}.max-w-2xl{max-width:42rem;width:100%;margin-inline:auto}.overflow-x-hidden{overflow-x:hidden}.fixed{position:fixed}.sticky{position:sticky}.inset-0{inset:0}.inset-x-0{left:0;right:0}.inset-x-3{left:.75rem;right:.75rem}.bottom-0{bottom:0}.p-2{padding:.5rem}.p-3{padding:.75rem}.p-4{padding:1rem}.p-5{padding:1.25rem}.mb-2{margin-bottom:.5rem}.mb-3{margin-bottom:.75rem}.mb-4{margin-bottom:1rem}.gap-2{gap:.5rem}.gap-3{gap:.75rem}.gap-4{gap:1rem}.rounded-xl{border-radius:.75rem}.rounded-2xl{border-radius:1rem}.border{border:1px solid rgba(148,163,184,.35)}.bg-slate-900{background:#0f172a}.bg-slate-950{background:#020617}.text-white{color:#fff}.text-slate-300{color:#cbd5e1}.text-xs{font-size:.75rem;line-height:1rem}.text-sm{font-size:.875rem;line-height:1.25rem}.text-base{font-size:1rem;line-height:1.5rem}.text-lg{font-size:1.125rem;line-height:1.75rem}.text-xl{font-size:1.25rem;line-height:1.75rem}.text-2xl{font-size:1.5rem;line-height:2rem}.text-slate-500,.text-slate-400{color:#cbd5e1!important}:where(button,a,input,select,textarea,[tabindex]):focus-visible{outline:2px solid #38bdf8;outline-offset:2px}@media(min-width:640px){.sm\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(min-width:768px){.md\:flex-row{flex-direction:row}.md\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.md\:flex{display:flex!important}.md\:hidden{display:none!important}}@media(min-width:1024px){.lg\:flex-row{flex-direction:row}.lg\:w-60{width:15rem}.lg\:hidden{display:none!important}.lg\:block{display:block}.lg\:flex{display:flex!important}.lg\:bottom-4{bottom:1rem}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}.animate-ping{animation:none!important}}.inline{display:inline}.inline-block{display:inline-block}.inline-flex{display:inline-flex}.absolute{position:absolute}.relative{position:relative}.flex-row{flex-direction:row}.items-start{align-items:flex-start}.justify-around{justify-content:space-around}.self-start{align-self:flex-start}.min-w-0{min-width:0}.min-h-5{min-height:1.25rem}.w-2{width:.5rem}.w-6{width:1.5rem}.w-8{width:2rem}.w-9{width:2.25rem}.w-10{width:2.5rem}.w-12{width:3rem}.w-44{width:11rem}.h-2{height:.5rem}.h-6{height:1.5rem}.h-8{height:2rem}.h-9{height:2.25rem}.h-10{height:2.5rem}.h-12{height:3rem}.h-44{height:11rem}.h-60{height:15rem}.h-72{height:18rem}.h-80{height:20rem}.h-96{height:24rem}.h-full{height:100%}.max-h-72{max-height:18rem}.max-h-96{max-height:24rem}.max-h-\[55vh\]{max-height:55vh}.max-w-xl{max-width:36rem}.max-w-2xl{max-width:42rem}.max-w-5xl{max-width:64rem}.max-w-6xl{max-width:72rem}.max-w-7xl{max-width:80rem}.top-0{top:0}.top-3{top:.75rem}.bottom-20{bottom:5rem}.right-3\.5{right:.875rem}.-left-10{left:-2.5rem}.-bottom-10{bottom:-2.5rem}.z-30{z-index:30}.z-40{z-index:40}.z-50{z-index:50}.z-\[70\]{z-index:70}.mx-auto{margin-left:auto;margin-right:auto}.my-auto{margin-top:auto;margin-bottom:auto}.mb-1{margin-bottom:.25rem}.mb-1\.5{margin-bottom:.375rem}.mb-6{margin-bottom:1.5rem}.ml-1{margin-left:.25rem}.mt-0\.5{margin-top:.125rem}.mt-1{margin-top:.25rem}.mt-2\.5{margin-top:.625rem}.mt-3{margin-top:.75rem}.p-1{padding:.25rem}.p-2\.5{padding:.625rem}.p-3\.5{padding:.875rem}.pb-1{padding-bottom:.25rem}.pb-2{padding-bottom:.5rem}.pb-3{padding-bottom:.75rem}.pt-1{padding-top:.25rem}.pt-2{padding-top:.5rem}.pt-12{padding-top:3rem}.px-1{padding-left:.25rem;padding-right:.25rem}.px-1\.5{padding-left:.375rem;padding-right:.375rem}.px-2{padding-left:.5rem;padding-right:.5rem}.px-2\.5{padding-left:.625rem;padding-right:.625rem}.px-3{padding-left:.75rem;padding-right:.75rem}.px-3\.5{padding-left:.875rem;padding-right:.875rem}.py-0\.5{padding-top:.125rem;padding-bottom:.125rem}.py-1{padding-top:.25rem;padding-bottom:.25rem}.py-1\.5{padding-top:.375rem;padding-bottom:.375rem}.py-2\.5{padding-top:.625rem;padding-bottom:.625rem}.py-3{padding-top:.75rem;padding-bottom:.75rem}.py-4{padding-top:1rem;padding-bottom:1rem}.pr-1{padding-right:.25rem}.pr-9{padding-right:2.25rem}.pl-4{padding-left:1rem}.gap-0\.5{gap:.125rem}.gap-1{gap:.25rem}.gap-1\.5{gap:.375rem}.gap-2\.5{gap:.625rem}.gap-5{gap:1.25rem}.grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.col-span-2{grid-column:span 2 / span 2}.col-span-3{grid-column:span 3 / span 3}.col-span-5{grid-column:span 5 / span 5}.col-span-7{grid-column:span 7 / span 7}.space-y-1>:not([hidden])~:not([hidden]){margin-top:.25rem}.space-y-2>:not([hidden])~:not([hidden]){margin-top:.5rem}.space-y-2\.5>:not([hidden])~:not([hidden]){margin-top:.625rem}.space-y-3>:not([hidden])~:not([hidden]){margin-top:.75rem}.space-y-3\.5>:not([hidden])~:not([hidden]){margin-top:.875rem}.space-y-4>:not([hidden])~:not([hidden]){margin-top:1rem}.space-y-5>:not([hidden])~:not([hidden]){margin-top:1.25rem}.rounded-lg{border-radius:.5rem}.rounded{border-radius:.25rem}.rounded-md{border-radius:.375rem}.rounded-3xl{border-radius:1.5rem}.rounded-full{border-radius:9999px}.border-t{border-top-width:1px;border-top-style:solid}.border-b{border-bottom-width:1px;border-bottom-style:solid}.border-r-4{border-right-width:4px;border-right-style:solid}.border-sky-500{border-color:#0ea5e9}.border-r-sky-500{border-right-color:#0ea5e9}.border-sky-400{border-color:#38bdf8}.border-sky-400\/40{border-color:#38bdf866}.border-sky-500\/30{border-color:#0ea5e94d}.border-sky-500\/40{border-color:#0ea5e966}.border-slate-600{border-color:#475569}.border-slate-700{border-color:#334155}.border-slate-700\/80{border-color:#334155cc}.border-slate-800{border-color:#1e293b}.border-amber-400\/40{border-color:#fbbf2466}.border-amber-500\/30{border-color:#f59e0b4d}.border-amber-500\/40{border-color:#f59e0b66}.border-emerald-400{border-color:#34d399}.border-emerald-500\/40{border-color:#10b98166}.border-rose-400{border-color:#fb7185}.border-rose-500\/40{border-color:#f43f5e66}.border-amber-400\/50{border-color:#fbbf2480}.bg-transparent{background-color:transparent}.bg-\[\#050811\]{background-color:#050811}.bg-\[\#040710\]{background-color:#040710}.bg-slate-800{background-color:#1e293b}.bg-slate-800\/90{background-color:#1e293be6}.bg-slate-900\/40{background-color:#0f172a66}.bg-slate-900\/50{background-color:#0f172a80}.bg-slate-900\/80{background-color:#0f172acc}.bg-slate-900\/90{background-color:#0f172ae6}.bg-slate-900\/95{background-color:#0f172af2}.bg-slate-950\/70{background-color:#020617b3}.bg-slate-950\/80{background-color:#020617cc}.bg-slate-950\/90{background-color:#020617e6}.bg-sky-400{background-color:#38bdf8}.bg-sky-500{background-color:#0ea5e9}.bg-sky-500\/10{background-color:#0ea5e91a}.bg-sky-500\/15{background-color:#0ea5e926}.bg-sky-500\/20{background-color:#0ea5e933}.bg-amber-400{background-color:#fbbf24}.bg-amber-500\/15{background-color:#f59e0b26}.bg-amber-500\/20{background-color:#f59e0b33}.bg-emerald-400{background-color:#34d399}.bg-emerald-500\/20{background-color:#10b98133}.bg-emerald-500\/25{background-color:#10b98140}.bg-rose-500\/20{background-color:#f43f5e33}.bg-rose-500\/25{background-color:#f43f5e40}.bg-black\/80{background-color:#000c}.text-slate-100{color:#f1f5f9}.text-slate-200{color:#e2e8f0}.text-slate-300,.text-slate-400,.text-slate-500{color:#cbd5e1}.text-sky-200{color:#bae6fd}.text-sky-300{color:#7dd3fc}.text-sky-400{color:#38bdf8}.text-amber-100{color:#fef3c7}.text-amber-200{color:#fde68a}.text-amber-300{color:#fcd34d}.text-amber-400{color:#fbbf24}.text-emerald-200{color:#a7f3d0}.text-emerald-300{color:#6ee7b7}.text-emerald-400{color:#34d399}.text-rose-200{color:#fecdd3}.text-rose-300{color:#fda4af}.text-rose-400{color:#fb7185}.text-purple-400{color:#c084fc}.text-transparent{color:transparent}.text-right{text-align:right}.text-center{text-align:center}.font-medium{font-weight:500}.font-semibold{font-weight:600}.font-bold{font-weight:700}.font-extrabold{font-weight:800}.font-black{font-weight:900}.leading-relaxed{line-height:1.625}.tracking-tight{letter-spacing:-.025em}.list-none{list-style:none}.cursor-pointer{cursor:pointer}.outline-none{outline:2px solid transparent;outline-offset:2px}.touch-none{touch-action:none}.pointer-events-none{pointer-events:none}.opacity-0{opacity:0}.opacity-100{opacity:1}.overflow-hidden{overflow:hidden}.overflow-x-auto{overflow-x:auto}.overflow-y-auto{overflow-y:auto}.bg-clip-text{background-clip:text;-webkit-background-clip:text}.bg-gradient-to-r{background-image:linear-gradient(to right,var(--gradient-from, transparent),var(--gradient-to, transparent))}.bg-gradient-to-br{background-image:linear-gradient(to bottom right,var(--gradient-from, transparent),var(--gradient-to, transparent))}.bg-gradient-to-l{background-image:linear-gradient(to left,var(--gradient-from, transparent),var(--gradient-to, transparent))}.from-white{--gradient-from: #fff}.from-sky-500{--gradient-from: #0ea5e9}.from-sky-600{--gradient-from: #0284c7}.via-sky-200{--gradient-mid: #bae6fd}.to-sky-300{--gradient-to: #7dd3fc}.to-sky-500{--gradient-to: #0ea5e9}.to-emerald-500{--gradient-to: #10b981}.bg-gradient-to-l.from-white.via-sky-200.to-sky-300{background-image:linear-gradient(to left,#fff,#bae6fd,#7dd3fc)}.shadow{box-shadow:0 1px 3px #0000002e}.shadow-lg{box-shadow:0 10px 15px -3px #00000040,0 4px 6px -4px #0003}.shadow-xl{box-shadow:0 20px 25px -5px #00000047,0 8px 10px -6px #00000038}.shadow-2xl{box-shadow:0 25px 50px -12px #00000059}.shadow-sky-500\/20{box-shadow:0 10px 15px -3px #0ea5e933}.shadow-sky-500\/25{box-shadow:0 10px 15px -3px #0ea5e940}.blur-2xl{filter:blur(40px)}.backdrop-blur-sm{backdrop-filter:blur(4px)}.duration-300{transition-duration:.3s}.duration-500{transition-duration:.5s}.transition{transition-property:color,background-color,border-color,opacity,box-shadow,transform;transition-duration:.15s}.transition-all{transition-property:all;transition-duration:.15s}.transition-opacity{transition-property:opacity;transition-duration:.15s}.hover\:bg-slate-700:hover{background-color:#334155}.hover\:bg-slate-800:hover{background-color:#1e293b}.hover\:bg-sky-500\/20:hover{background-color:#0ea5e933}.hover\:bg-rose-500\/20:hover{background-color:#f43f5e33}.hover\:bg-rose-500\/30:hover{background-color:#f43f5e4d}.hover\:border-sky-400:hover{border-color:#38bdf8}.hover\:border-sky-500:hover{border-color:#0ea5e9}.hover\:text-white:hover{color:#fff}.focus\:border-amber-400:focus{border-color:#fbbf24}.selection\:bg-sky-500 ::selection{background-color:#0ea5e9}.selection\:text-white ::selection{color:#fff}.scroll-mt-20{scroll-margin-top:5rem}@media(min-width:640px){.sm\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.sm\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.sm\:flex-row{flex-direction:row}.sm\:items-center{align-items:center}.sm\:inline{display:inline}.sm\:h-72{height:18rem}.sm\:h-96{height:24rem}}@media(min-width:768px){.md\:flex{display:flex!important}.md\:hidden{display:none!important}.md\:flex-row{flex-direction:row}.md\:items-center{align-items:center}.md\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.md\:col-span-2{grid-column:span 2 / span 2}.md\:h-80{height:20rem}.md\:p-4{padding:1rem}.md\:p-5{padding:1.25rem}.md\:p-7{padding:1.75rem}.md\:p-8{padding:2rem}.md\:px-6{padding-left:1.5rem;padding-right:1.5rem}.md\:text-sm{font-size:.875rem;line-height:1.25rem}.md\:text-base{font-size:1rem;line-height:1.5rem}.md\:text-xl{font-size:1.25rem;line-height:1.75rem}.md\:text-2xl{font-size:1.5rem;line-height:2rem}.md\:text-3xl{font-size:1.875rem;line-height:2.25rem}.md\:text-4xl{font-size:2.25rem;line-height:2.5rem}}@media(min-width:1024px){.lg\:hidden{display:none!important}.lg\:flex{display:flex!important}.lg\:block{display:block}.lg\:flex-row{flex-direction:row}.lg\:w-60{width:15rem}.lg\:bottom-4{bottom:1rem}.lg\:sticky{position:sticky}.lg\:top-16{top:4rem}.lg\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}[class~="lg:max-h-[calc(100vh-10rem)]"]{max-height:calc(100vh - 10rem)}}@media(min-width:1280px){.xl\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.xl\:grid-cols-5{grid-template-columns:repeat(5,minmax(0,1fr))}.xl\:grid-cols-12{grid-template-columns:repeat(12,minmax(0,1fr))}.xl\:col-span-2{grid-column:span 2 / span 2}.xl\:col-span-3{grid-column:span 3 / span 3}.xl\:col-span-5{grid-column:span 5 / span 5}.xl\:col-span-7{grid-column:span 7 / span 7}}@keyframes ping{75%,to{transform:scale(2);opacity:0}}.animate-ping{animation:ping 1s cubic-bezier(0,0,.2,1) infinite}[class~="max-h-[55vh]"]{max-height:55vh}:root{color-scheme:dark;--page-bg: #0b1120;--surface: #111a2b;--surface-raised: #172238;--surface-border: #2a3952;--accent: #42c5e8;--body-copy: #d1d9e6}html{scroll-behavior:smooth}body{background-color:var(--page-bg);color:#f4f7fb;font-size:1rem;line-height:1.65;padding-bottom:78px}.glass-card{background:var(--surface);border-color:var(--surface-border);backdrop-filter:none;-webkit-backdrop-filter:none;box-shadow:0 8px 24px #0000002e}.glass-header{background:#0b1120f7;backdrop-filter:none;-webkit-backdrop-filter:none;border-color:#243149}.text-xs{font-size:.8125rem;line-height:1.4rem}.text-sm{font-size:.9375rem;line-height:1.55rem}.text-base{font-size:1.0625rem;line-height:1.65rem}.text-slate-300{color:var(--body-copy)!important}.bg-slate-950{background-color:#0d1628}.bg-slate-900{background-color:#142039}.bg-slate-800{background-color:#1c2a41}button,select,input,textarea{font-size:inherit}button{min-height:2.625rem;transition:background-color .16s ease,border-color .16s ease,color .16s ease,transform .16s ease}button:hover{border-color:#49617f}button:active{transform:translateY(1px)}button[aria-pressed=true]{box-shadow:inset 0 0 0 1px #42c5e847}input:not([type=range]),select,textarea{min-height:2.75rem;background-color:#0c1424;border-color:#34445e;border-radius:.75rem;color:#f4f7fb}input[type=range]{height:2rem;background:transparent}input[type=range]::-webkit-slider-runnable-track{height:.5rem;border-radius:999px;background:#34445e}input[type=range]::-moz-range-track{height:.5rem;border-radius:999px;background:#34445e}input[type=range].phys-slider::-webkit-slider-thumb{box-shadow:0 0 0 3px #42c5e829}:where(button,a,input,select,textarea,[tabindex]):focus-visible{outline-color:#67d7f3;outline-offset:3px}#portalGate{background:radial-gradient(ellipse at 50% 0%,#12213a,#0b1120,#080d18)}#portalGate .glass-card{background:#111b2e;border-color:#2d4561}#portalGate h2{line-height:1.35}#portalGate .grid>div{line-height:1.65}#chapterHeaderCard{background:#121d30;padding:1.1rem 1.25rem}#activeChapterSub{color:#71d2ec;font-size:.9rem;line-height:1.5}#activeChapterTitle{font-size:clamp(1.25rem,1.8vw,1.65rem);line-height:1.5}#lessonSidebar .glass-card{background:#10192a}#sidebarTitle{font-size:.9rem}#sidebarProgressCount{font-size:.82rem}#chapterListContainer{max-height:min(72vh,860px);padding-inline-end:.15rem}#chapterListContainer details{border-color:#293850;background:#121c2f;border-radius:.9rem}#chapterListContainer summary{min-height:2.9rem;padding:.7rem .85rem;font-size:.875rem;line-height:1.5}#chapterListContainer summary:after{content:"⌄";margin-inline-start:.45rem;color:#8fa2bb;font-size:1rem}#chapterListContainer details[open]>summary:after{content:"⌃";color:#71d2ec}#chapterListContainer details[open]>summary{color:#e9f7fb;background:#42c5e812}#chapterListContainer button{min-height:2.9rem;padding:.72rem .8rem;font-size:.875rem;line-height:1.55;border-radius:.8rem}#chapterListContainer button[class*="bg-sky-500/20"]{background:#239bbc33;border-color:#46c4e4}#mobileLessonsToggle{min-height:2.75rem}#physicsLessonOverview{padding:1.15rem;border-color:#2a4961}#lessonOverviewTitle{font-size:1.15rem;line-height:1.6}#lessonOverviewSummary{color:#d2dbe8;font-size:.95rem;line-height:1.85}#lessonOverviewFormula{min-height:2.6rem;display:flex;align-items:center;font-size:1rem;line-height:1.7}#lessonSimulationPanel{padding:clamp(1rem,2.5vw,1.5rem);border-color:#2a4961}#lessonSimTitle{font-size:1.15rem;line-height:1.6}#lessonSimDescription{max-width:72ch;color:#d2dbe8;font-size:.95rem;line-height:1.8}#lessonSimControls label,#lessonRevisionControls label{color:#e0e7f0;line-height:1.6}#lessonSimResults{min-height:12rem;border-color:#2b3b55;line-height:1.75}#lessonSimCanvas{border-radius:.8rem}#tabBtn-lab,#tabBtn-revision,#tabBtn-quiz{min-height:2.75rem;padding-inline:1rem;font-size:.875rem}#tabContent-revision,#tabContent-quiz{line-height:1.7}#tabContent-revision .glass-card,#tabContent-quiz .glass-card{border-color:#2a3952}#quizQuestionsContainer>*{border-color:#2a3952}#mobTab-lab,#mobTab-revision,#mobTab-quiz{min-height:3.15rem;font-size:.8rem}nav.lg\:hidden{background:#0b1120fa;padding-bottom:max(.45rem,env(safe-area-inset-bottom))}@media(min-width:1024px){body{padding-bottom:0}#lessonSidebar .glass-card{padding:.9rem}}@media(max-width:767px){.max-w-7xl{padding-inline:.75rem}#chapterHeaderCard{padding:1rem;gap:.85rem}#chapterListContainer{max-height:min(42vh,440px)}#lessonOverviewTitle,#lessonSimTitle{font-size:1.08rem}#lessonOverviewSummary,#lessonSimDescription{font-size:.9rem}#lessonSimResults{min-height:auto}#lessonSimControls{gap:.65rem}#tabContent-revision,#tabContent-quiz{gap:.8rem}}@media(max-width:1279px){#physCanvasCard{position:sticky;top:var(--hdr-h, 56px);z-index:20;background:var(--surface, #111a2b)!important;box-shadow:0 10px 24px #00000059}}@media(max-width:767px){#physCanvasCard #physCanvasTitle{display:none}#physCanvasCard .phys-canvas-wrap{height:10.5rem!important}}.adv-sliders>summary{list-style:none}.adv-sliders>summary::-webkit-details-marker{display:none}:root{--bg:#0f1729;--card:#16213a;--card2:#1b2848;--line:#2b3b5e;--ink:#f3f6fc;--ink2:#c9d3e6;--mut:#9fb0cc;--brand:#5eb8ff;--brand-soft:rgba(94,184,255,.14);--ok:#4ade9a;--warn:#f5c26b;--bad:#ff8a9b;--r:1.1rem}html[data-theme=light]{--bg:#f4f7fb;--card:#ffffff;--card2:#eef3fa;--line:#d8e1ee;--ink:#14213d;--ink2:#35476b;--mut:#5d6f90;--brand:#1d6fd6;--brand-soft:rgba(29,111,214,.1);--ok:#0f9d63;--warn:#b7791f;--bad:#d6455d;color-scheme:light}html{font-size:17px}body{background:var(--bg)!important;color:var(--ink)!important;line-height:1.85;letter-spacing:0}#portalGate{background:var(--bg)!important}.glass-card,#portalGate .glass-card,#lessonSidebar .glass-card,#chapterHeaderCard{background:var(--card)!important;border:1px solid var(--line)!important;border-radius:var(--r)!important;box-shadow:0 2px 10px #00000014!important}.glass-header{background:var(--card)!important;border-bottom:1px solid var(--line)!important}.glass-header nav,nav.lg\:hidden{background:var(--card)!important}.animate-ping,.blur-2xl{display:none!important}.bg-gradient-to-r,.bg-gradient-to-br{background:var(--brand)!important}.bg-clip-text{background:none!important;color:var(--ink)!important;-webkit-text-fill-color:var(--ink)!important}.shadow-lg,.shadow-xl,.shadow-sky-500\/20,.shadow-sky-500\/25{box-shadow:none!important}.bg-slate-900,.bg-slate-900\/40,.bg-slate-900\/50,.bg-slate-900\/80,.bg-slate-900\/90,.bg-slate-900\/95,.bg-slate-800,.bg-slate-800\/90,.bg-slate-950,.bg-slate-950\/70,.bg-slate-950\/80,.bg-slate-950\/90{background:var(--card2)!important}.border-slate-600,.border-slate-700,.border-slate-700\/80,.border-slate-800,.border-sky-500\/30,.border-sky-500\/40,.border-amber-500\/30,.border-amber-500\/40,.border-emerald-500\/40{border-color:var(--line)!important}.text-white,.text-slate-100,.text-slate-200{color:var(--ink)!important}.text-slate-300,.text-slate-400,.text-slate-500{color:var(--ink2)!important}.text-sky-200,.text-sky-300,.text-sky-400{color:var(--brand)!important}.text-amber-200,.text-amber-300,.text-amber-400{color:var(--warn)!important}.text-emerald-200,.text-emerald-300,.text-emerald-400{color:var(--ok)!important}.text-rose-300,.text-rose-400{color:var(--bad)!important}.text-xs{font-size:.85rem!important;line-height:1.6!important}.text-sm{font-size:.98rem!important;line-height:1.75!important}.text-base{font-size:1.08rem!important}#lessonOverviewSummary,#lessonSimDescription,#lessonRevisionSummary{font-size:1.05rem!important;line-height:2!important;color:var(--ink)!important;max-width:68ch}button{border-radius:.8rem;min-height:2.75rem}.bg-sky-500,.bg-sky-500\/20{background:var(--brand)!important;color:#fff!important;border-color:var(--brand)!important}html:not([data-theme=light]) .bg-sky-500,html:not([data-theme=light]) .bg-sky-500\/20{color:#06142b!important}.bg-sky-500\/10,.bg-sky-500\/15{background:var(--brand-soft)!important}.bg-amber-500\/15,.bg-amber-500\/20{background:#f5c26b24!important}.bg-emerald-500\/20,.bg-emerald-500\/25{background:#4ade9a24!important}.bg-rose-500\/20,.bg-rose-500\/25{background:#ff8a9b24!important}button:hover{border-color:var(--brand)!important}#chapterHeaderCard{border-right:4px solid var(--brand)!important;padding:1.2rem 1.4rem!important}#activeChapterTitle{font-size:clamp(1.3rem,2vw,1.8rem)!important;line-height:1.6!important}#activeChapterSub{color:var(--mut)!important;font-weight:600}#physicsLessonOverview,#lessonSimulationPanel{padding:1.4rem!important}#lessonOverviewFormula{font-size:1.15rem!important;color:var(--ink)!important;background:var(--brand-soft);padding:.8rem 1rem;border-radius:.8rem}#chapterListContainer details{background:var(--card2)!important;border:1px solid var(--line)!important;border-radius:.9rem!important}#chapterListContainer summary{font-size:.95rem!important;padding:.8rem 1rem!important;color:var(--ink)!important}#chapterListContainer button{font-size:.93rem!important;line-height:1.7!important;padding:.7rem .85rem!important;background:transparent!important;color:var(--ink)!important;border:1px solid transparent!important}#chapterListContainer button:hover{background:var(--brand-soft)!important}#chapterListContainer button[class*="bg-sky-500/20"]{background:var(--brand-soft)!important;border-color:var(--brand)!important;color:var(--ink)!important;font-weight:700}#chapterListContainer .fa-flask{display:none}#tabBtn-lab,#tabBtn-revision,#tabBtn-quiz{font-size:.95rem!important;padding:.55rem 1rem!important}.rounded-xl.border.border-slate-800.shrink-0,#chapterHeaderCard .shrink-0{background:var(--card2)!important}nav.lg\:hidden{border-top:1px solid var(--line)!important}#mobTab-lab,#mobTab-revision,#mobTab-quiz{font-size:.8rem!important}input:not([type=range]),select,textarea{background:var(--card2)!important;color:var(--ink)!important;border:1px solid var(--line)!important;border-radius:.8rem!important}input[type=range]::-webkit-slider-runnable-track{background:var(--line)!important}input[type=range].phys-slider::-webkit-slider-thumb{background:var(--brand)!important;box-shadow:0 0 0 4px var(--brand-soft)!important;width:26px;height:26px}.bg-\[\#040710\]{background:#0a1224!important;border-color:var(--line)!important}:where(button,a,input,select,textarea,[tabindex]):focus-visible{outline:3px solid var(--brand)!important;outline-offset:3px}#chapterListContainer{display:block!important;overflow-y:auto!important;overflow-x:hidden}#chapterListContainer>details{display:block!important;flex:none!important;height:auto!important;min-height:0!important;overflow:visible!important;margin-bottom:.6rem}#chapterListContainer summary{display:flex!important;height:auto!important;min-height:3rem;overflow:visible!important;white-space:normal!important;align-items:center;justify-content:space-between;gap:.5rem;cursor:pointer;list-style:none}#chapterListContainer summary::-webkit-details-marker{display:none}#chapterListContainer details>div{display:block!important;height:auto!important;overflow:visible!important;padding:.4rem .5rem .6rem!important}#chapterListContainer details>div>button{display:flex!important;width:100%;height:auto!important;margin-bottom:.3rem;text-align:right;white-space:normal!important}#chapterListContainer details>div>button>span:first-child{flex:1;min-width:0}@media(min-width:1024px){#lessonSidebar{width:19rem!important}#chapterListContainer{max-height:calc(100vh - 9rem)!important}}@media(max-width:1023px){#chapterListContainer{max-height:65vh!important}}input[type=range]{-webkit-appearance:none;appearance:none;height:28px!important;background:transparent!important;padding:0;margin:0;display:block;vertical-align:middle}input[type=range]::-webkit-slider-runnable-track{height:8px!important;border-radius:999px;background:var(--line)!important}input[type=range]::-moz-range-track{height:8px!important;border-radius:999px;background:var(--line)!important}input[type=range]::-webkit-slider-thumb,input[type=range].phys-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:24px!important;height:24px!important;margin-top:-8px!important;border-radius:50%;background:var(--brand)!important;border:3px solid var(--card)!important;box-shadow:0 0 0 2px var(--brand)!important}input[type=range]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--brand);border:3px solid var(--card);box-shadow:0 0 0 2px var(--brand)}#portalGate b.block,#portalGate .rounded-xl>b{display:block!important;margin-bottom:.35rem}#portalGate .rounded-xl>span{display:block!important}#themeToggleBtn{width:2.25rem;height:2.25rem;border-radius:.8rem;background:var(--card2);border:1px solid var(--line);color:var(--ink);display:inline-flex;align-items:center;justify-content:center;min-height:0}@media(max-width:767px){html{font-size:16px}#physicsLessonOverview,#lessonSimulationPanel{padding:1rem!important}}.cb-card{margin-top:.9rem;background:var(--card);border:1px solid var(--line);border-radius:var(--r,1.1rem);padding:1rem;box-shadow:0 2px 10px #00000014}.cb-head h3{display:flex;gap:.5rem;align-items:center;margin:0 0 .3rem;font-weight:900;font-size:1.1rem;color:var(--ink)}.cb-head h3 i{color:var(--brand)}.cb-head p{margin:0 0 .8rem;color:var(--ink2);font-size:.9rem;line-height:1.9}.cb-grid{display:grid;gap:.9rem;grid-template-columns:minmax(0,1fr)}@media(min-width:1024px){.cb-grid{grid-template-columns:minmax(0,1.3fr) minmax(0,1fr)}}.cb-col{display:flex;flex-direction:column;gap:.7rem;min-width:0}.cb-view{position:relative;height:19rem;background:#040710;border:1px solid var(--line);border-radius:.9rem;overflow:hidden}@media(min-width:640px){.cb-view{height:25rem}}.cb-view canvas{width:100%;height:100%;display:block;touch-action:none;cursor:grab}.cb-nogl{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:1rem;text-align:center;color:#cbd5e1;font-size:.9rem}.cb-tools,.cb-add,.cb-seg{display:flex;flex-wrap:wrap;gap:.45rem}.cb-btn{min-height:2.4rem;padding:.35rem .8rem;border-radius:.7rem;border:1px solid var(--line);background:var(--card);color:var(--ink);font-weight:700;font-size:.85rem}.cb-btn.on{background:var(--brand);color:#06142b;border-color:var(--brand)}html[data-theme=light] .cb-btn.on{color:#fff}.cb-btn:disabled{opacity:.45;cursor:not-allowed}.cb-seg .cb-btn{flex:1}.cb-tiles{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.5rem}@media(min-width:640px){.cb-tiles{grid-template-columns:repeat(4,minmax(0,1fr))}}.cb-tile{background:var(--card2);border:1px solid var(--line);border-radius:.8rem;padding:.5rem .6rem;text-align:center}.cb-tile span{display:block;font-size:.78rem;color:var(--mut)}.cb-tile b{display:block;font-size:1.05rem;color:var(--ink)}.cb-box{background:var(--card2);border:1px solid var(--line);border-radius:.9rem;padding:.75rem;display:flex;flex-direction:column;gap:.55rem}.cb-line{display:flex;justify-content:space-between;align-items:center;gap:.5rem;font-size:.88rem;color:var(--ink)}.cb-formula{background:var(--card2);border:1px solid var(--line);border-radius:.8rem;padding:.6rem .75rem;font-size:.85rem;color:var(--ink);line-height:1.9;overflow-x:auto}.cb-row{display:flex;flex-wrap:wrap;gap:.3rem .5rem;align-items:center;padding:.45rem;border:1px solid var(--line);border-radius:.7rem;background:var(--card)}.cb-nm{font-weight:800;color:var(--ink);white-space:nowrap}.cb-in{display:flex;align-items:center;gap:.3rem;color:var(--ink2)}.cb-in input{width:100%;min-width:0;padding:.3rem .5rem;border-radius:.5rem;border:1px solid var(--line);background:var(--card2);color:var(--ink);direction:ltr;text-align:center;font-weight:700}.cb-x{min-height:2.2rem;width:2.2rem;border-radius:.6rem;border:1px solid var(--line);background:transparent;color:var(--bad)}.cb-res{grid-column:1/-1;font-size:.8rem;color:var(--mut)}.cb-msg{margin:0;font-size:.85rem;line-height:1.9;color:var(--ink2)}.cb-msg.warn{color:var(--bad)}.lesson-locked{opacity:.55;cursor:not-allowed;filter:grayscale(.4)}.lesson-locked:hover{border-color:#fbbf2499!important}.cb-palette{display:flex;flex-wrap:wrap;gap:.4rem}.cb-palette .cb-btn{padding:.3rem .65rem;font-size:.85rem}.cb-hint{margin:0;padding:.45rem .7rem;border-radius:.7rem;background:var(--card2);border:1px solid var(--line);font-size:.85rem;line-height:1.8;color:var(--ink2)}.cb-hint.warn{color:var(--bad);border-color:var(--bad)}.cb-lbl{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;font-size:.88rem;color:var(--ink)}.cb-lbl input{width:4rem;padding:.3rem .5rem;border-radius:.5rem;border:1px solid var(--line);background:var(--card2);color:var(--ink);text-align:center}.cb-info{display:flex;flex-direction:column;gap:.3rem;font-size:.88rem;line-height:1.8;color:var(--ink)}.cb-row{flex-wrap:wrap}.cb-row.sel{border-color:var(--brand)}.cb-row .cb-res{flex-basis:100%}.cb-card .hidden{display:none!important}#videoBoardModal{position:fixed;inset:0;z-index:60;background:#000000d9;backdrop-filter:blur(4px);display:flex;align-items:flex-start;justify-content:center;padding:.75rem;overflow-y:auto}#videoBoardModal.hidden{display:none}.vb-panel{width:100%;max-width:1100px;background:#111b2e;border:1px solid #2d4561;border-radius:1rem;padding:.9rem;color:#f3f6fc;display:flex;flex-direction:column;gap:.6rem}.vb-head{display:flex;align-items:center;justify-content:space-between}.vb-head h3{font-weight:900;color:#fda4af;font-size:1rem;display:flex;gap:.5rem;align-items:center}.vb-source,.vb-tools,.vb-player{display:flex;flex-wrap:wrap;gap:.45rem;align-items:center}.vb-source input[type=url]{flex:1;min-width:200px;padding:.5rem .75rem;border-radius:.65rem;background:#0b1424;border:1px solid #2b3b5e;color:#fff;font-size:.8rem}.vb-btn{padding:.4rem .7rem;border-radius:.65rem;background:#1b2848;border:1px solid #2b3b5e;color:#e2e8f0;font-size:.75rem;font-weight:700;cursor:pointer;font-family:inherit}.vb-btn:hover{background:#243459}.vb-btn.active{background:#0ea5e9;border-color:#38bdf8;color:#fff}.vb-primary{background:#e11d48;border-color:#fb7185;color:#fff}.vb-icon{width:2rem;height:2rem;padding:0;display:flex;align-items:center;justify-content:center}.vb-file{display:inline-flex;gap:.4rem;align-items:center}.vb-color{width:1.7rem;height:1.7rem;border-radius:50%;border:2px solid #475569;cursor:pointer;padding:0}.vb-color.active{border-color:#fff;box-shadow:0 0 0 2px #0ea5e9}.vb-sep{width:1px;height:1.5rem;background:#2b3b5e}.vb-status{font-size:.75rem;color:#9fb0cc;min-height:1rem;margin:0}.vb-stage{position:relative;width:100%;aspect-ratio:16/9;max-height:68vh;background:#000;border-radius:.75rem;overflow:hidden;touch-action:none}.vb-media,.vb-media video,.vb-media iframe{position:absolute;inset:0;width:100%;height:100%;border:0;background:#000}.vb-media video{object-fit:contain}#vbCanvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none}.vb-empty{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;text-align:center;padding:1rem;color:#9fb0cc;font-size:.9rem}.vb-empty.hidden,.vb-player.hidden{display:none}.vb-player #vbSeek{flex:1;min-width:140px}.vb-player span{font-size:.75rem;color:#c9d3e6;min-width:6.5rem;text-align:center}.vb-player select{background:#1b2848;color:#e2e8f0;border:1px solid #2b3b5e;border-radius:.5rem;padding:.3rem}.vb-stage:fullscreen{max-height:none;aspect-ratio:auto;border-radius:0}#videoBoardModal .vb-source input[type=url]{background:#0b1424!important;color:#fff!important;border:1px solid #2b3b5e!important}#videoBoardModal .vb-source input[type=url]::placeholder{color:#7f90ad}:root{--bg:#0a1020;--card:#121c33;--card2:#182544;--line:#26365a;--brand:#62bcff;--shadow:0 14px 34px -18px rgba(0,0,0,.7),0 1px 0 rgba(255,255,255,.05) inset}html[data-theme=light]{--shadow:0 12px 30px -16px rgba(20,33,61,.28),0 1px 0 rgba(255,255,255,.8) inset}html:not([data-theme=light]) body{background:radial-gradient(900px 480px at 88% -8%,rgba(98,188,255,.18),transparent 62%),radial-gradient(760px 420px at 4% 6%,rgba(74,222,154,.11),transparent 58%),var(--bg)!important;background-attachment:fixed!important}html[data-theme=light] body{background:radial-gradient(900px 480px at 88% -8%,rgba(29,111,214,.1),transparent 62%),radial-gradient(760px 420px at 4% 6%,rgba(15,157,99,.07),transparent 58%),var(--bg)!important;background-attachment:fixed!important}body #portalGate{background:radial-gradient(800px 460px at 85% 0%,rgba(98,188,255,.2),transparent 60%),radial-gradient(700px 420px at 8% 100%,rgba(74,222,154,.13),transparent 60%),var(--bg)!important}body .glass-header{background:color-mix(in srgb,var(--card) 82%,transparent)!important;-webkit-backdrop-filter:blur(14px) saturate(1.4);backdrop-filter:blur(14px) saturate(1.4);box-shadow:0 10px 26px -20px #000000b3}.glass-header:after{content:"";position:absolute;inset:auto 0 0;height:2px;background:linear-gradient(90deg,transparent,var(--brand),var(--ok),transparent);opacity:.75;pointer-events:none}body .glass-card,body #lessonSidebar .glass-card,body #portalGate .glass-card,body #chapterHeaderCard{box-shadow:var(--shadow)!important;transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease}body #portalGate .glass-card[role=button]:hover{transform:translateY(-4px);border-color:var(--brand)!important;box-shadow:0 22px 44px -20px var(--brand)!important}#portalGate .glass-card .grid>div{transition:transform .2s ease,border-color .2s ease}#portalGate .glass-card .grid>div:hover{transform:translateY(-2px);border-color:var(--brand)!important}#portalGate .blur-2xl{display:block!important;background:radial-gradient(circle,var(--brand-soft),transparent 70%)!important;border-radius:50%}@keyframes riseIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}@media(prefers-reduced-motion:no-preference){#tabContent-lab>.glass-card,#chapterHeaderCard,#portalGate .glass-card{animation:riseIn .45s ease backwards}}body .bg-gradient-to-br,body .bg-gradient-to-r{background:linear-gradient(135deg,var(--brand),color-mix(in srgb,var(--brand) 45%,var(--ok)))!important}body .bg-sky-500{background:linear-gradient(135deg,var(--brand),color-mix(in srgb,var(--brand) 60%,var(--ok)))!important;box-shadow:0 8px 20px -10px var(--brand)!important}body #portalGate h1.bg-clip-text,body #activeChapterTitle{background:linear-gradient(90deg,var(--ink),var(--brand))!important;-webkit-background-clip:text!important;background-clip:text!important;-webkit-text-fill-color:transparent!important;color:transparent!important}body #portalGate h2{background:linear-gradient(90deg,var(--brand),var(--ok))!important;-webkit-background-clip:text!important;background-clip:text!important;-webkit-text-fill-color:transparent!important;color:transparent!important}#chapterListContainer details{transition:border-color .2s ease,background .2s ease}body #chapterListContainer details[open]{border-color:var(--brand)!important;background:var(--brand-soft)!important}#chapterListContainer details summary>span:last-child{background:var(--brand-soft)!important;color:var(--brand)!important;border-radius:999px;font-weight:800;padding-inline:.55rem}#chapterListContainer details button{border-radius:.75rem;transition:transform .15s ease,border-color .15s ease}#chapterListContainer details button:hover{transform:translate(-3px)}input[type=range]{background:linear-gradient(90deg,var(--brand-soft),var(--line))!important}nav.lg\:hidden{box-shadow:0 -10px 26px -14px #0009!important}:focus-visible{outline:2px solid var(--brand);outline-offset:2px}bdi.mchunk{display:inline-block;max-width:100%;direction:ltr;unicode-bidi:isolate;text-align:left;margin-inline:.18em;padding:0 .4em;border-radius:.5em;background:var(--brand-soft);color:inherit;font-weight:700;font-feature-settings:"tnum";line-height:1.6;vertical-align:baseline}.st-stages{display:flex;flex-direction:column;gap:1rem;max-width:56rem;margin:0 auto;width:100%}.st-stage{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:1rem;box-shadow:0 2px 10px #00000014}.st-stage-head{display:flex;align-items:center;gap:.75rem;margin-bottom:.9rem}.st-stage-icon{width:2.75rem;height:2.75rem;flex:none;border-radius:.9rem;display:flex;align-items:center;justify-content:center;font-size:1.15rem;background:var(--brand-soft);color:var(--brand);border:1px solid var(--line)}.st-stage-primary .st-stage-icon{background:#4ade9a24;color:var(--ok)}.st-stage-prep .st-stage-icon{background:#f5c26b29;color:var(--warn)}.st-stage-title{margin:0;font-size:1.2rem;font-weight:900;color:var(--ink);line-height:1.4}.st-stage-sub{margin:0;font-size:.8rem;color:var(--mut);line-height:1.5}.st-grades{display:grid;gap:.6rem;grid-template-columns:repeat(2,minmax(0,1fr))}@media(min-width:640px){.st-grades-6,.st-grades-3{grid-template-columns:repeat(3,minmax(0,1fr))}}.st-grade{display:flex;align-items:center;gap:.65rem;min-height:3.25rem;padding:.55rem .75rem;text-align:right;border-radius:.9rem;background:var(--card2);border:1px solid var(--line);color:var(--ink);cursor:pointer;transition:border-color .15s,transform .15s}.st-grade:hover{border-color:var(--brand);transform:translateY(-1px)}.st-grade:focus-visible,.st-back:focus-visible,.st-term:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.st-grade-num{width:2rem;height:2rem;flex:none;border-radius:.6rem;display:flex;align-items:center;justify-content:center;font-weight:900;background:var(--brand-soft);color:var(--brand)}.st-stage-primary .st-grade-num{background:#4ade9a24;color:var(--ok)}.st-stage-prep .st-grade-num{background:#f5c26b29;color:var(--warn)}.st-grade-name{font-size:.85rem;font-weight:700;line-height:1.4}.st-stage-secondary>.group{margin:0}.st-view{position:fixed;inset:0;z-index:55;overflow-y:auto;background:var(--bg);outline:none}.st-view.hidden{display:none!important}.sv-top{position:sticky;top:0;z-index:30;padding:.6rem .8rem}.sv-top-in{max-width:80rem;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:.5rem}.sv-top-r,.sv-top-l{display:flex;align-items:center;gap:.5rem}.sv-iconbtn{width:2.25rem;height:2.25rem;border-radius:.75rem;background:var(--card2);border:1px solid var(--line);color:var(--ink2);display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:.8rem}.sv-iconbtn:hover{border-color:var(--brand);color:var(--brand)}.sv-badge-top{font-size:.75rem;font-weight:800;padding:.3rem .65rem;border-radius:.6rem;background:var(--brand-soft);color:var(--brand);border:1px solid var(--line)}.sv-layout{max-width:80rem;margin:0 auto;display:flex;flex-direction:column;gap:1rem;padding:.7rem}@media(min-width:1024px){.sv-layout{flex-direction:row;align-items:flex-start;padding:1.25rem}.sv-side{width:15rem;flex:none;position:sticky;top:4.2rem}}.sv-side-card{padding:.75rem}.sv-side-head{display:flex;align-items:center;justify-content:space-between;gap:.5rem;margin-bottom:.6rem}.sv-side-head h2{margin:0;font-size:.75rem;font-weight:800;color:var(--ink2)}.sv-progress{font-size:.75rem;font-weight:800;color:var(--warn);white-space:nowrap}.sv-side-card .st-terms{margin-bottom:.6rem;padding:.2rem;gap:.25rem;border-radius:.8rem}.sv-side-card .st-term{font-size:.72rem;padding:.4rem .2rem;border-radius:.6rem}.sv-chapters{display:flex;flex-direction:column;gap:.4rem;max-height:55vh;overflow-y:auto;scrollbar-width:none}@media(min-width:1024px){.sv-chapters{max-height:calc(100vh - 15rem)}}.sv-chapters::-webkit-scrollbar{display:none}.sv-chapter{border:1px solid var(--line);background:var(--card2);border-radius:.8rem;overflow:hidden}.sv-chapter>summary{cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between;gap:.5rem;padding:.65rem .75rem;font-size:.75rem;font-weight:800;color:var(--ink);line-height:1.6}.sv-chapter>summary::-webkit-details-marker{display:none}.sv-badge{flex:none;border-radius:.4rem;background:var(--card);border:1px solid var(--line);padding:.05rem .4rem;font-size:.7rem;color:var(--ink2)}.sv-lessons{padding:0 .5rem .5rem;display:flex;flex-direction:column;gap:.3rem}.sv-lesson{display:flex;align-items:center;justify-content:space-between;gap:.4rem;width:100%;text-align:right;padding:.5rem .6rem;border-radius:.65rem;border:1px solid var(--line);background:var(--card);color:var(--ink2);font-size:.75rem;font-weight:600;line-height:1.6;cursor:pointer;font-family:inherit}.sv-lesson:hover{border-color:var(--brand)}.sv-lesson.on{border-color:var(--brand);background:var(--brand-soft);color:var(--ink);font-weight:800}.sv-check{color:var(--ok);font-weight:900}.sv-side-empty{display:flex;flex-direction:column;align-items:center;gap:.4rem;padding:1.2rem .5rem;font-size:.78rem;color:var(--mut);text-align:center}.sv-side-empty i{font-size:1.3rem;color:var(--brand)}.sv-main{flex:1;min-width:0;display:flex;flex-direction:column;gap:.8rem;scroll-margin-top:4rem}.sv-headcard{display:flex;flex-direction:column;gap:.7rem;padding:.9rem;border-right:4px solid var(--brand)!important}@media(min-width:768px){.sv-headcard{flex-direction:row;align-items:center;justify-content:space-between}}.sv-sub{font-size:.75rem;font-weight:800;color:var(--brand)}.sv-h1{margin:0;font-size:1.05rem;font-weight:900;color:var(--ink);line-height:1.6}@media(min-width:768px){.sv-h1{font-size:1.25rem}}.sv-nav{display:flex;gap:.4rem;flex:none}.sv-navbtn{display:flex;align-items:center;gap:.4rem;padding:.4rem .75rem;border-radius:.7rem;background:var(--card2);border:1px solid var(--line);color:var(--ink2);font-size:.75rem;font-weight:800;cursor:pointer;font-family:inherit}.sv-navbtn:hover:not(:disabled){border-color:var(--brand);color:var(--brand)}.sv-navbtn:disabled{opacity:.4;cursor:default}.sv-body{display:flex;flex-direction:column;gap:.8rem}.sv-head-title{flex:1;min-width:0}.sv-section-tabs{display:flex;align-items:center;gap:.2rem;flex:none;max-width:100%;overflow-x:auto;padding:.25rem;border:1px solid var(--line);border-radius:.85rem;background:var(--card2);scrollbar-width:none}.sv-section-tabs::-webkit-scrollbar{display:none}.sv-section-tab{display:flex;align-items:center;justify-content:center;gap:.4rem;min-height:2.5rem;padding:.55rem .8rem;border:1px solid transparent;border-radius:.65rem;background:transparent;color:var(--ink2);font-family:inherit;font-size:.8rem;font-weight:800;white-space:nowrap;cursor:pointer;transition:background .15s,border-color .15s,color .15s}.sv-section-tab:hover{border-color:var(--line);color:var(--ink)}.sv-section-tab.on{border-color:var(--brand);background:var(--brand);color:#fff;box-shadow:0 6px 16px #3b82f638}.sv-section-tab:focus-visible{outline:2px solid var(--brand);outline-offset:2px}@media(max-width:767px){.sv-section-tabs{width:100%;justify-content:stretch}.sv-section-tab{flex:1;min-width:0;gap:.3rem;padding:.5rem .3rem;font-size:.72rem}}.sv-card{padding:1rem;display:flex;flex-direction:column;gap:.7rem;border-color:var(--brand)!important}.sv-view-mode{display:flex;flex-wrap:wrap;gap:.45rem}.sv-view-mode button{padding:.45rem .75rem;border:1px solid var(--line);border-radius:.65rem;background:var(--card2);color:var(--ink2);font:inherit;font-size:.75rem;font-weight:800;cursor:pointer}.sv-view-mode button.on{border-color:var(--brand);background:var(--brand);color:#fff;box-shadow:0 5px 14px #3b82f633}.sv-view-mode button:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.sv-card-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem}.sv-curric{font-size:.75rem;font-weight:800;color:var(--brand)}.sv-status{padding:.25rem .6rem;border-radius:.6rem;background:var(--card2);font-size:.72rem;font-weight:800;color:var(--ink2)}.sv-ovtitle{margin:0;font-size:.95rem;font-weight:900;color:var(--ink);line-height:1.6}.sv-summary{margin:0;font-size:.82rem;line-height:1.9;color:var(--ink2)}.sv-idea{border-radius:.8rem;background:var(--brand-soft);border:1px solid var(--line);padding:.7rem .8rem}.sv-idea-lab{display:block;margin-bottom:.3rem;font-size:.75rem;font-weight:800;color:var(--brand)}.sv-idea p{margin:0;font-size:.85rem;font-weight:800;color:var(--ink)}.sv-sim-head{display:flex;align-items:center;gap:.5rem;color:var(--brand)}.sv-sim-head h3{margin:0;font-size:.95rem;font-weight:900;color:var(--ink)}.sv-controls{display:grid;gap:.6rem;grid-template-columns:1fr}@media(min-width:640px){.sv-controls{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(min-width:1280px){.sv-controls{grid-template-columns:repeat(3,minmax(0,1fr))}}.sv-ctl{padding:.65rem .8rem;border-radius:.8rem;background:var(--card2);border:1px solid var(--line)}.sv-ctl-top{display:flex;justify-content:space-between;gap:.5rem;margin-bottom:.4rem;font-size:.75rem;font-weight:700;color:var(--ink2)}.sv-ctl-top b{color:var(--brand);font-weight:900}.sv-ctl input[type=range]{width:100%;accent-color:var(--brand);cursor:pointer}.sv-observe{padding:.65rem .8rem;border-radius:.8rem;background:#f5c26b1f;border:1px solid rgba(245,194,107,.4);color:var(--warn);font-size:.78rem;line-height:1.8;font-weight:700}.sv-sim-grid{display:grid;gap:.7rem;grid-template-columns:1fr}@media(min-width:1280px){.sv-sim-grid{grid-template-columns:3fr 2fr}}.sv-canvas-wrap{border-radius:.8rem;overflow:hidden;border:1px solid var(--line);background:#040710}.sv-canvas-wrap canvas{display:block;width:100%;height:auto;aspect-ratio:16/9}.sv-results{display:flex;flex-direction:column;justify-content:center;gap:.5rem;padding:.8rem;border-radius:.8rem;background:var(--card2);border:1px solid var(--line)}.sv-result{display:flex;justify-content:space-between;gap:.6rem;font-size:.82rem;color:var(--ink2);padding:.35rem 0;border-bottom:1px dashed var(--line)}.sv-result:last-child{border-bottom:0}.sv-result b{color:var(--ink);font-weight:900;text-align:left}.sv-done{align-self:flex-start;padding:.65rem 1.2rem;border-radius:.8rem;border:0;background:var(--brand);color:#06142b;font-weight:900;font-size:.85rem;cursor:pointer;font-family:inherit}html[data-theme=light] .sv-done{color:#fff}html .sv-done.done{background:var(--card2);color:var(--ok);border:1px solid var(--ok)}html[data-theme=light] .sv-done.done{color:var(--ok)}.sv-iconbtn:focus-visible,.sv-navbtn:focus-visible,.sv-lesson:focus-visible,.sv-done:focus-visible,.sv-chapter>summary:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.st-terms{display:flex;gap:.5rem;margin-bottom:1rem;padding:.3rem;background:var(--card);border:1px solid var(--line);border-radius:1rem}.st-term{flex:1;padding:.55rem .5rem;border-radius:.75rem;font-weight:800;font-size:.85rem;color:var(--ink2);background:transparent;border:0;cursor:pointer}.st-term.on{background:var(--brand);color:#06142b}html[data-theme=light] .st-term.on{color:#fff}.st-empty{text-align:center;padding:2.2rem 1rem;background:var(--card);border:1px dashed var(--line);border-radius:1rem;color:var(--mut)}.st-empty i{font-size:1.8rem;color:var(--brand);margin-bottom:.6rem}.st-empty-title{margin:.2rem 0;font-size:1.05rem;font-weight:800;color:var(--ink)}.st-empty-text{margin:0;font-size:.85rem}.law-card{cursor:pointer;position:relative;transition:transform .15s ease,border-color .15s ease,box-shadow .15s ease}.law-card:hover{transform:translateY(-2px);border-color:#0ea5e9b3}.law-card:focus-visible{outline:2px solid #0ea5e9;outline-offset:2px}.law-card-active{border-color:#0ea5e9!important;box-shadow:0 0 0 2px #0ea5e973,0 6px 18px #0ea5e92e}.law-card-hint{display:flex;align-items:center;gap:.35rem;margin-top:.5rem;font-size:.7rem;font-weight:800;color:#0ea5e9;opacity:.85}.law-card-active .law-card-hint{opacity:1}.law-alt-btn{display:block;width:100%;margin-top:.45rem;padding:.35rem .5rem;border-radius:.6rem;border:1px dashed rgba(14,165,233,.6);background:transparent;color:#0ea5e9;font-size:.72rem;font-weight:800;cursor:pointer}.law-alt-btn:hover{background:#0ea5e91f}#physCalcCard{scroll-margin-top:5rem}.calc-flash{animation:calcFlash 1.1s ease}@keyframes calcFlash{0%{box-shadow:0 0 #0ea5e9b3}60%{box-shadow:0 0 0 10px #0ea5e900}to{box-shadow:0 0 #0ea5e900}}.sv-sim-col{display:flex;flex-direction:column;gap:.5rem;min-width:0}.sv-canvas-wrap canvas{touch-action:none;cursor:grab}.sv-canvas-wrap canvas:focus-visible{outline:2px solid var(--brand);outline-offset:-2px}.sv-tools{display:flex;flex-wrap:wrap;gap:.5rem}.sv-toolbtn{padding:.4rem .75rem;border-radius:.65rem;background:var(--card2);border:1px solid var(--line);color:var(--ink2);font-size:.75rem;font-weight:700;cursor:pointer;font-family:inherit}.sv-toolbtn[aria-pressed=true]{border-color:var(--brand);color:var(--brand)}.sv-toolbtn:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.sv-live-equation{display:grid;grid-template-columns:minmax(0,1fr);gap:.35rem;padding:.65rem .8rem;border:1px solid var(--line);border-radius:.8rem;background:#020617e6}.sv-live-equation-title{display:flex;align-items:center;gap:.35rem;justify-self:end;color:var(--brand);font-size:.75rem;font-weight:900;white-space:nowrap}.sv-live-equation-value{width:100%;min-width:0;color:var(--ink);font-size:clamp(.72rem,1vw,.9rem);font-weight:900;line-height:1.65;text-align:left;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.sv-hint{margin:0;font-size:.72rem;color:var(--mut)}.sv-laws{display:grid;gap:.5rem}.sv-law{padding:.6rem .8rem;border-radius:.75rem;background:#38bdf81a;border:1px solid rgba(56,189,248,.3);unicode-bidi:plaintext;font-weight:700}.sv-q{margin:.8rem 0;padding:.8rem;border-radius:.9rem;background:#94a3b814}.sv-q p{font-weight:800;margin-bottom:.5rem;unicode-bidi:plaintext}.sv-q-challenge{border:1px solid rgba(250,204,21,.42);background:linear-gradient(135deg,#facc1517,#94a3b814)}.sv-q-level{display:inline-block;margin-bottom:.45rem;padding:.2rem .55rem;border-radius:999px;background:#facc1529;color:#facc15;font-size:.78rem;font-weight:900}.sv-opt{display:block;width:100%;text-align:start;margin:.3rem 0;padding:.55rem .8rem;border-radius:.6rem;border:1px solid rgba(148,163,184,.4);background:transparent;color:inherit;cursor:pointer;unicode-bidi:plaintext}.sv-opt:hover:not(:disabled){border-color:#38bdf8}.sv-opt.ok{background:#22c55e40;border-color:#22c55e}.sv-opt.bad{background:#ef444440;border-color:#ef4444}.sv-q-why{margin-top:.5rem;font-size:.9rem;color:#86efac}.sv-q-score{font-weight:900;font-size:1.1rem;margin-top:.5rem}