@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap";:root{--bg-primary:#f8fafc;--bg-secondary:#fff;--bg-tertiary:#f1f5f9;--text-primary:#090d16;--text-secondary:#1e293b;--text-muted:#475569;--primary:#1d4ed8;--primary-hover:#1e40af;--primary-glow:#1d4ed81f;--accent:#2563eb;--accent-hover:#1d4ed8;--accent-silver:#64748b;--border-color:#090d16;--border-light:#cbd5e1;--border-focus:#1d4ed8;--success:#059669;--success-bg:#ecfdf5;--danger:#dc2626;--danger-bg:#fef2f2;--grad-primary:linear-gradient(135deg, #1d4ed8 0%, #3b82f6 100%);--grad-accent:linear-gradient(135deg, #475569 0%, #090d16 100%);--grad-dark:linear-gradient(135deg, #090d16 0%, #1e293b 100%);--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--shadow-sm:0 1px 2px 0 #090d160d;--shadow-md:0 4px 6px -1px #090d160d, 0 2px 4px -2px #090d160d;--shadow-lg:0 10px 15px -3px #090d1614;--shadow-xl:0 20px 25px -5px #090d161a;--font-sans:"Inter", system-ui, -apple-system, sans-serif;--font-heading:"Outfit", var(--font-sans)}@media (prefers-color-scheme:dark){:root{--bg-primary:#f8fafc;--bg-secondary:#fff;--bg-tertiary:#f1f5f9;--text-primary:#090d16;--text-secondary:#1e293b;--text-muted:#475569;--border-color:#090d16;--border-light:#cbd5e1;--shadow-sm:0 1px 2px 0 #090d160d;--shadow-md:0 4px 6px -1px #090d160d;--shadow-lg:0 10px 15px -3px #090d1614;--shadow-xl:0 20px 25px -5px #090d161a}}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;line-height:1.75}a{color:var(--primary);font-weight:650;text-decoration:none}a:hover{color:var(--primary-hover);text-decoration:underline}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);color:var(--text-primary);font-weight:700;line-height:1.3}.app-shell{flex-direction:column;min-height:100vh;display:flex}.main-content{flex:1 0 auto;padding-bottom:5rem}.content-width{max-width:1140px;margin:0 auto;padding:0 2rem}.text-center{text-align:center}.text-danger{color:var(--danger)}.text-success{color:var(--success)}.text-muted{color:var(--text-muted)}.text-gradient{color:var(--primary)}.flex-center{justify-content:center;align-items:center;display:flex}.gap-1{gap:.25rem}.gap-2{gap:.5rem}.mt-4{margin-top:1rem}.mt-6{margin-top:1.5rem}.mt-8{margin-top:2rem}.mt-12{margin-top:3.5rem}.my-6{margin:1.5rem 0}.my-8{margin:2rem 0}.w-full{width:100%}.block{display:block}.flex-1{flex:1}.btn-primary,.btn-secondary,.btn-white,.btn-outline-white,.btn-small,.btn-block{font-family:var(--font-heading);border-radius:var(--radius-sm);cursor:pointer;border:1.5px solid var(--border-color);justify-content:center;align-items:center;gap:.5rem;padding:.85rem 1.75rem;font-weight:700;transition:transform .15s,box-shadow .15s,background-color .15s;display:inline-flex}.btn-primary{background-color:var(--primary);box-shadow:2px 2px 0 0 var(--border-color);color:#fff!important}.btn-primary:hover{box-shadow:3px 3px 0 0 var(--border-color);background-color:var(--primary-hover);transform:translate(-1px,-1px)}.btn-secondary{background-color:var(--bg-secondary);color:var(--text-primary)}.btn-secondary:hover{background-color:var(--bg-tertiary);box-shadow:2px 2px 0 0 var(--border-color);transform:translate(-1px,-1px)}.btn-white{color:#090d16;box-shadow:2px 2px 0 0 var(--border-color);background-color:#fff}.btn-white:hover{background-color:var(--bg-tertiary);box-shadow:3px 3px 0 0 var(--border-color);transform:translate(-1px,-1px)}.btn-outline-white{color:#fff;background-color:#0000;border-color:#fff;box-shadow:2px 2px #fff}.btn-outline-white:hover{background-color:#ffffff1a;transform:translate(-1px,-1px);box-shadow:3px 3px #fff}.btn-small{padding:.45rem 1rem;font-size:.875rem}.btn-block{width:100%}.nav-container{z-index:100;-webkit-backdrop-filter:blur(8px);border-bottom:1.5px solid var(--border-color);background-color:#fffffff2;position:sticky;top:0}.nav-wrapper{justify-content:space-between;align-items:center;max-width:1140px;margin:0 auto;padding:1.2rem 2rem;display:flex}.nav-logo{font-family:var(--font-heading);align-items:center;gap:.4rem;font-size:1.45rem;font-weight:800;display:flex;color:var(--text-primary)!important}.logo-icon{color:var(--primary);fill:var(--primary)}.logo-text-accent{color:var(--accent-silver)}.nav-menu-desktop{gap:1rem;display:flex}.nav-link{font-family:var(--font-heading);color:var(--text-secondary);border-radius:var(--radius-sm);border:1.5px solid #0000;padding:.5rem .9rem;font-size:.95rem;font-weight:700;transition:all .15s}.nav-link.active{background-color:var(--primary);border-color:var(--border-color);box-shadow:2px 2px 0 0 var(--border-color);color:#fff!important}.nav-link:hover:not(.active){color:var(--primary);background-color:var(--bg-tertiary);border-color:var(--border-color)}.nav-mobile-toggle{cursor:pointer;color:var(--text-primary);background:0 0;border:none;display:none}.nav-menu-mobile{background-color:var(--bg-secondary);border-bottom:1.5px solid var(--border-color);width:100%;box-shadow:var(--shadow-lg);flex-direction:column;gap:.75rem;padding:1.5rem 2rem;display:flex;position:absolute;top:100%;left:0}.nav-link-mobile{font-family:var(--font-heading);color:var(--text-secondary);border-radius:var(--radius-sm);border:1.5px solid var(--border-color);padding:.6rem 1rem;font-weight:700}.nav-link-mobile.active{background-color:var(--primary);color:#fff}@media (width<=768px){.nav-menu-desktop{display:none}.nav-mobile-toggle{display:block}}.hero-section{background-color:var(--bg-secondary);border-bottom:1.5px solid var(--border-color);color:var(--text-primary);text-align:center;padding:8rem 2rem;position:relative}.hero-overlay{background-image:radial-gradient(circle at 10% 20%,#1d4ed808 0%,#0000 40%),radial-gradient(circle at 90% 80%,#64748b0d 0%,#0000 40%);width:100%;height:100%;position:absolute;top:0;left:0}.hero-content{z-index:10;max-width:800px;margin:0 auto;position:relative}.hero-tagline{font-family:var(--font-heading);letter-spacing:.12em;text-transform:uppercase;color:var(--primary);margin-bottom:1.5rem;font-size:.95rem;font-weight:800;display:block}.hero-title{color:var(--text-primary);letter-spacing:-.04em;margin-bottom:2rem;font-size:3.85rem;font-weight:800;line-height:1.15}@media (width<=768px){.hero-title{font-size:2.5rem}}.hero-desc{color:var(--text-secondary);margin-bottom:3rem;font-size:1.25rem}.hero-cta-group{flex-wrap:wrap;justify-content:center;gap:1.25rem;display:flex}.stats-section{z-index:20;margin-top:-5rem;padding:4rem 2rem;position:relative}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:2.25rem;max-width:1000px;margin:0 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2rem}.section-header{text-align:center;margin-bottom:4rem}.section-title{margin-bottom:.85rem;font-size:2.5rem;font-weight:800}.section-subtitle{color:var(--text-muted);font-size:1.2rem}.method-grid{grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2.5rem;display:grid}.method-card{background-color:var(--bg-secondary);border-radius:var(--radius-md);border:1.5px solid var(--border-color);box-shadow:3px 3px 0 0 var(--border-color);padding:3rem 2.5rem;position:relative;overflow:hidden}.method-number{font-family:var(--font-heading);color:var(--primary);opacity:.12;font-size:3.5rem;font-weight:800;position:absolute;top:1rem;right:1.5rem}.method-title{margin-bottom:1rem;font-size:1.45rem}.method-text{color:var(--text-secondary);font-size:1rem}.meet-tutor-section{background-color:var(--bg-tertiary);border-top:1.5px solid var(--border-color);border-bottom:1.5px solid var(--border-color);padding:6rem 2rem}.meet-tutor-grid{grid-template-columns:1fr 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auto}.cta-title{color:#fff;margin-bottom:1.25rem;font-size:2.75rem;font-weight:800}.cta-desc{color:#ffffffd9;margin-bottom:2.5rem;font-size:1.2rem}.cta-btn-group{flex-wrap:wrap;justify-content:center;gap:1.25rem;display:flex}.ad-slot-container{border-radius:var(--radius-sm);background-color:var(--bg-secondary);border:1.5px dashed var(--border-color);margin:2.5rem auto;overflow:hidden}.ad-slot-horizontal{width:100%;max-height:120px;padding:1.25rem}.ad-slot-vertical{width:100%;min-height:280px;padding:2rem}.ad-slot-rectangle{width:100%;min-height:220px;padding:2rem}.ad-placeholder-content{text-align:center;flex-direction:column;justify-content:center;align-items:center;width:100%;height:100%;display:flex}.ad-badge{color:var(--text-muted);letter-spacing:.1em;text-transform:uppercase;margin-bottom:.5rem;font-size:.7rem;font-weight:800}.ad-placeholder-body{flex-wrap:wrap;justify-content:center;align-items:center;gap:1.5rem;display:flex}.ad-placeholder-text{color:var(--text-secondary);max-width:600px;font-size:.95rem;font-weight:700}.ad-placeholder-btn{font-family:var(--font-heading);background-color:var(--primary);border-radius:var(--radius-sm);border:1.5px solid var(--border-color);box-shadow:2px 2px 0 0 var(--border-color);padding:.45rem 1.1rem;font-size:.85rem;font-weight:800;color:#fff!important}.ad-placeholder-btn:hover{background-color:var(--primary-hover);box-shadow:3px 3px 0 0 var(--border-color);transform:translate(-1px,-1px)}.curriculum-header{padding:5rem 0 3rem}.page-title{letter-spacing:-.03em;margin-bottom:.75rem;font-size:3rem;font-weight:800}.page-desc{color:var(--text-secondary);max-width:700px;margin:0 auto 2.5rem;font-size:1.25rem}.search-bar-container{max-width:580px;margin:0 auto;position:relative}.search-icon{color:var(--text-muted);position:absolute;top:50%;left:1.5rem;transform:translateY(-50%)}.search-input{border-radius:var(--radius-sm);border:1.5px solid var(--border-color);background-color:var(--bg-secondary);width:100%;color:var(--text-primary);box-shadow:2px 2px 0 0 var(--border-color);outline:none;padding:1.1rem 1rem 1.1rem 3.75rem;font-size:1.05rem;transition:all .15s}.search-input:focus{border-color:var(--primary);box-shadow:3px 3px 0 0 var(--primary)}.curriculum-layout{grid-template-columns:280px 1fr;gap:3rem;margin-top:3rem;display:grid}@media (width<=900px){.curriculum-layout{grid-template-columns:1fr;gap:2.5rem}}.level-tabs{flex-direction:column;gap:1rem;display:flex}@media (width<=900px){.level-tabs{flex-direction:row;padding-bottom:.5rem;overflow-x:auto}}.level-tab-btn{background-color:var(--bg-secondary);border:1.5px solid var(--border-color);border-radius:var(--radius-md);text-align:left;cursor:pointer;flex-direction:column;gap:.4rem;padding:1.5rem;transition:all .15s;display:flex}.level-tab-btn.active{border-color:var(--primary);background-color:var(--bg-secondary);box-shadow:3px 3px 0 0 var(--border-color);border-left:5px solid var(--primary)}.level-tab-btn.active .tab-title{color:var(--primary)}.tab-title{font-family:var(--font-heading);color:var(--text-primary);font-size:1.1rem;font-weight:700}.tab-subtitle{color:var(--text-muted);font-size:.85rem}.level-info-card{background-color:var(--bg-secondary);border-radius:var(--radius-md);border:1.5px solid var(--border-color);box-shadow:2px 2px 0 0 var(--border-color);margin-bottom:2.5rem;padding:2.5rem}.level-title-large{margin-bottom:.75rem;font-size:2rem}.level-desc{color:var(--text-secondary);font-size:1.05rem}.topics-grid{flex-direction:column;gap:2.5rem;display:flex}.topic-card{background-color:var(--bg-secondary);border-radius:var(--radius-md);border:1.5px solid var(--border-color);box-shadow:3px 3px 0 0 var(--border-color);padding:2.5rem}.topic-title{border-bottom:1.5px solid var(--border-color);margin-bottom:1.5rem;padding-bottom:.85rem;font-size:1.45rem}.lessons-list{flex-direction:column;gap:.85rem;display:flex}.lesson-item-btn{background-color:var(--bg-primary);border:1.5px solid var(--border-color);border-radius:var(--radius-sm);cursor:pointer;text-align:left;justify-content:space-between;align-items:center;padding:1.1rem 1.5rem;transition:all .15s;display:flex}.lesson-item-btn:hover{border-color:var(--primary);background-color:var(--bg-tertiary);box-shadow:2px 2px 0 0 var(--border-color);transform:translate(-1px,-1px)}.lesson-item-btn.has-content{border-left:5px solid var(--primary);background-color:var(--bg-secondary)}.lesson-info{align-items:center;gap:1rem;display:flex}.lesson-icon{color:var(--primary)}.lesson-title-text{color:var(--text-primary);font-weight:700}.lesson-meta{color:var(--text-muted);align-items:center;gap:.75rem;font-size:.85rem;display:flex}.badge-free{background-color:var(--primary-glow);color:var(--primary);text-transform:uppercase;border:1px solid var(--border-color);border-radius:4px;padding:.25rem .65rem;font-size:.75rem;font-weight:800}.badge-soon{background-color:var(--bg-tertiary);color:var(--text-muted);border:1.5px solid var(--border-light);border-radius:4px;padding:.25rem .65rem;font-size:.75rem;font-weight:700}.lesson-view-container{padding:3rem 0 5rem}.btn-back{cursor:pointer;font-family:var(--font-heading);color:var(--text-secondary);background:0 0;border:none;align-items:center;gap:.4rem;margin-bottom:2rem;font-weight:800;display:flex}.btn-back:hover{color:var(--primary);text-decoration:underline}.lesson-layout{grid-template-columns:1fr 340px;gap:3rem;display:grid}@media (width<=1024px){.lesson-layout{grid-template-columns:1fr;gap:2.5rem}}.lesson-main-card{color:#090d16;border-radius:var(--radius-md);border:1.5px solid var(--border-color);box-shadow:4px 4px 0 0 var(--border-color);background-color:#fff;padding:3.5rem}@media (width<=600px){.lesson-main-card{padding:2.5rem 1.5rem}}.lesson-header-meta{gap:.75rem;margin-bottom:1.25rem;display:flex}.lesson-level-badge,.lesson-topic-badge{border:1.5px solid var(--border-color);border-radius:4px;padding:.35rem .8rem;font-size:.8rem;font-weight:800}.lesson-level-badge{background-color:var(--primary-glow);color:var(--primary)}.lesson-topic-badge{background-color:var(--bg-tertiary);color:var(--text-secondary)}.lesson-main-title{letter-spacing:-.03em;margin-bottom:2rem;font-size:2.65rem;font-weight:800}.lesson-intro{color:var(--text-secondary);border-left:5px solid var(--primary);margin-bottom:3.5rem;padding-left:1.5rem;font-size:1.2rem;line-height:1.8}.section-divider-title{border-bottom:2.5px solid var(--border-color);color:var(--primary);margin-bottom:1.75rem;padding-bottom:.6rem;font-size:1.5rem}.lesson-steps{flex-direction:column;gap:2rem;margin-bottom:4rem;display:flex}.lesson-step-card{background-color:var(--bg-primary);border-radius:var(--radius-sm);border:1.5px solid var(--border-color);padding:2rem}.step-title{color:var(--text-primary);margin-bottom:.75rem;font-size:1.25rem;font-weight:800}.step-content{color:var(--text-secondary);white-space:pre-line;font-size:1.05rem;line-height:1.75}.lesson-practice-section{border-top:2px dashed var(--border-color);padding-top:3.5rem}.practice-intro-text{color:var(--text-muted);margin-bottom:2rem;font-size:1.05rem}.practice-question-card{background-color:var(--bg-primary);border:1.5px solid var(--border-color);border-radius:var(--radius-md);margin-bottom:2rem;padding:2.5rem}.question-text{color:var(--text-primary);margin-bottom:1.5rem;font-size:1.15rem;font-weight:700}.options-grid{grid-template-columns:1fr;gap:.9rem;display:grid}.option-btn{background-color:var(--bg-secondary);border:1.5px solid var(--border-color);border-radius:var(--radius-sm);cursor:pointer;text-align:left;font-family:var(--font-sans);align-items:center;width:100%;padding:1.1rem 1.5rem;font-size:1rem;transition:all .15s;display:flex}.option-btn:hover:not(:disabled){border-color:var(--primary);background-color:var(--bg-tertiary);box-shadow:2px 2px 0 0 var(--border-color);transform:translate(-1px,-1px)}.option-btn.selected{border-color:var(--primary);background-color:var(--primary-glow);box-shadow:2px 2px 0 0 var(--border-color);font-weight:700}.option-btn.correct{border-color:var(--success);background-color:var(--success-bg);box-shadow:2px 2px 0 0 var(--success);font-weight:700;color:var(--success)!important}.option-btn.incorrect{border-color:var(--danger);background-color:var(--danger-bg);box-shadow:2px 2px 0 0 var(--danger);color:var(--danger)!important}.option-letter{color:var(--text-muted);margin-right:1rem;font-weight:800}.option-status-icon{margin-left:auto}.explanation-box{border-radius:var(--radius-sm);border:1.5px solid var(--border-color);border-left:5px solid #0000;margin-top:1.5rem;padding:1.5rem}.explanation-box.success{background-color:var(--success-bg);border-left-color:var(--success)}.explanation-box.danger{background-color:var(--danger-bg);border-left-color:var(--danger)}.explanation-title{margin-bottom:.4rem;font-size:1.05rem;font-weight:800}.explanation-text-body{white-space:pre-line;font-size:.975rem}.practice-actions{justify-content:flex-end;gap:1.25rem;margin-top:2rem;display:flex}.lesson-sidebar{flex-direction:column;gap:2rem;display:flex}.sidebar-card{background-color:var(--bg-secondary);border-radius:var(--radius-md);border:1.5px solid var(--border-color);box-shadow:3px 3px 0 0 var(--border-color);padding:2rem}.sidebar-card-title{border-bottom:1.5px solid var(--border-color);margin-bottom:1.25rem;padding-bottom:.6rem;font-size:1.25rem}.formula-item{margin-bottom:1.5rem}.formula-desc{color:var(--text-muted);margin-bottom:.4rem;font-size:.9rem;font-weight:600;display:block}.formula-math-display{color:#60a5fa;border-radius:var(--radius-sm);text-align:center;border:1.5px solid var(--border-color);background-color:#090d16;padding:1.1rem;font-family:monospace;font-size:1.1rem;font-weight:600;overflow-x:auto}.promo-card{background:var(--grad-dark);color:#fff}.promo-card .promo-title{color:#fff;margin-bottom:.5rem;font-size:1.35rem}.promo-card .promo-desc{color:#ffffffd9;margin-bottom:1.5rem;font-size:.9rem}.tutoring-hero{padding:5rem 0 3rem}.pricing-grid{grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:3rem;max-width:900px;margin:0 auto 4rem;display:grid}.pricing-card{background-color:var(--bg-secondary);border-radius:var(--radius-md);border:1.5px solid var(--border-color);box-shadow:3px 3px 0 0 var(--border-color);flex-direction:column;padding:3.5rem 2.5rem;display:flex;position:relative}.pricing-card.popular-card{box-shadow:5px 5px 0 0 var(--border-color);border-width:2px}.popular-badge{background-color:var(--primary);color:#fff;border-radius:var(--radius-sm);text-transform:uppercase;border:1.5px solid var(--border-color);padding:.35rem .95rem;font-size:.8rem;font-weight:800;position:absolute;top:1.25rem;right:2rem}.price-container{align-items:baseline;margin:1.5rem 0 .75rem;display:flex}.price-amount{font-family:var(--font-heading);font-size:3.25rem;font-weight:800;line-height:1}.price-period{color:var(--text-muted);margin-left:.35rem;font-size:1rem;font-weight:600}.card-subtitle{color:var(--primary);margin-bottom:1rem;font-size:.95rem;font-weight:700}.card-desc{color:var(--text-secondary);min-height:60px;margin-bottom:2rem;font-size:.95rem}.features-divider{border-top:1.5px solid 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