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1px 2px #0000004d;--shadow-md:0 4px 6px #0006;--shadow-lg:0 10px 15px #00000080;--header-bg:#1a1b1e;--header-text:#c1c2c5;--header-text-muted:#909296;--header-border:#373a40;--header-hover-bg:#2c2e33;--header-active-bg:#2a3050;--header-active-text:#74c0fc;--cta-primary-bg:#f57c00;--cta-primary-bg-hover:#ff9800;--cta-primary-text:#1a1b1e;--subject-math:#64b5f6;--subject-reading:#81c784;--subject-english:#ef9a9a;--cta-secondary-border:#74c0fc;--cta-secondary-text:#74c0fc;--cta-secondary-hover-bg:#2a3050;--icon-bg:#2a3050;--icon-color:#74c0fc;--quiz-correct:#1e3a2a;--quiz-incorrect:#3e2228;--quiz-hint:#332b1a;--quiz-option-hover:#364fc7;--quiz-option-border:#373a40;--premium-star:#fab005}body{background:var(--bg-primary);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;transition:background-color .2s,color .2s}a{color:var(--text-link);text-decoration:none}a:hover{color:var(--text-link-hover)}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border-primary);border-radius:3px}.learning-content h1,.learning-content h2,.learning-content h3{color:var(--text-primary);margin-top:1.5rem;margin-bottom:.75rem;font-weight:600}.learning-content h1{font-size:1.75rem}.learning-content h2{font-size:1.5rem}.learning-content h3{font-size:1.25rem}.learning-content p{color:var(--text-secondary);margin-bottom:1rem;line-height:1.7}.learning-content ul,.learning-content ol{margin-bottom:1rem;padding-right:1.5rem}.learning-content li{color:var(--text-secondary);margin-bottom:.5rem;line-height:1.6}.bidi-isolate{unicode-bidi:isolate}.question-content,.option-content,.explanation-content{direction:rtl;unicode-bidi:plaintext}.question-content [dir=ltr],.option-content [dir=ltr],.explanation-content [dir=ltr]{direction:ltr;unicode-bidi:isolate;display:inline}.MathJax,.MathJax_Display,mjx-container{direction:ltr!important;unicode-bidi:isolate!important;display:inline-block!important}.header-nav-link:hover{background-color:var(--header-hover-bg)!important}@keyframes streak-pulse{0%,to{transform:scale(1)}50%{transform:scale(1.12)}}.streak-fire-active{animation:2s ease-in-out infinite streak-pulse}@keyframes stat-fade-up{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.stat-card-enter{opacity:0;animation:.5s ease-out forwards stat-fade-up}html,body{overscroll-behavior:none}*{-webkit-tap-highlight-color:transparent}button,a,input,select,textarea,[role=button]{touch-action:manipulation}button,a,[role=button]{-webkit-touch-callout:none}button,a,nav,header,[role=button],.header-nav-link{-webkit-user-select:none;user-select:none}body{padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right)}@media (display-mode:standalone){header{padding-top:env(safe-area-inset-top)}footer{padding-bottom:env(safe-area-inset-bottom)}}:root{--sidebar-width:260px}.sidebar-open .sidebar-overlay{display:block!important}.sidebar-open .sidebar-nav{transform:translate(0)!important}@media (min-width:1024px){.sidebar-nav{transform:translate(0)!important}}@property --tw-translate-x{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-y{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-z{syntax:"*";inherits:false;initial-value:0}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-space-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-duration{syntax:"*";inherits:false}@property --tw-scale-x{syntax:"*";inherits:false;initial-value:1}@property --tw-scale-y{syntax:"*";inherits:false;initial-value:1}@property --tw-scale-z{syntax:"*";inherits:false;initial-value:1}@keyframes pulse{50%{opacity:.5}}@keyframes bounce{0%,to{animation-timing-function:cubic-bezier(.8,0,1,1);transform:translateY(-25%)}50%{animation-timing-function:cubic-bezier(0,0,.2,1);transform:none}}