:root{--primary:#059669;--primary-dark:#064E3B;--primary-light:#ECFDF5;--accent:#F57C00;--accent-light:#FFF3E0;--text:#1F2937;--text-light:#6B7280;--bg:#FAFAFA;--white:#FFFFFF;--border:#E5E7EB;--radius:12px;--radius-sm:8px;--shadow:0 1px 3px rgba(0,0,0,0.1);--shadow-md:0 4px 12px rgba(0,0,0,0.1);--max-w:1200px;--transition:0.2s ease;}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}html{font-size:16px;scroll-behavior:smooth;}body{font-family:'Nunito',sans-serif;color:var(--text);background:var(--bg);line-height:1.6;}h1,h2,h3,h4{font-family:'Fredoka One',cursive;font-weight:400;line-height:1.2;}a{color:var(--primary);text-decoration:none;}a:hover{text-decoration:underline;}img{max-width:100%;height:auto;}ul,ol{list-style:none;}.container{max-width:var(--max-w);margin:0 auto;padding:0 1.5rem;}.site-header{background:var(--white);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;}.site-header .container{display:flex;align-items:center;justify-content:space-between;height:64px;}.logo{display:flex;align-items:center;gap:0.5rem;font-family:'Fredoka One',cursive;font-size:1.25rem;color:var(--primary-dark);}.logo:hover{text-decoration:none;}.logo-icon{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;background:var(--primary);color:var(--white);border-radius:var(--radius-sm);font-size:1.1rem;font-weight:700;}.main-nav ul{display:flex;gap:1.5rem;}.main-nav a{color:var(--text);font-weight:600;font-size:0.95rem;padding:0.25rem 0;}.main-nav a:hover,.main-nav a[aria-current="page"]{color:var(--primary);text-decoration:none;}.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:0.5rem;}.nav-toggle span{display:block;width:24px;height:2px;background:var(--text);margin:5px 0;transition:var(--transition);}.hero{background:linear-gradient(135deg,var(--primary-dark) 0%,var(--primary) 100%);color:var(--white);padding:4rem 0;text-align:center;}.hero h1{font-size:2.5rem;margin-bottom:1rem;}.hero-tagline{font-size:1.15rem;opacity:0.9;max-width:600px;margin:0 auto 2rem;}.hero-search{max-width:500px;margin:0 auto;}.hero-search input{width:100%;padding:0.875rem 1.25rem;border:none;border-radius:50px;font-size:1rem;font-family:inherit;box-shadow:var(--shadow-md);}.hero-search input:focus{outline:3px solid var(--accent);}.hero-search{position:relative;}.search-dropdown{display:none;position:absolute;top:100%;left:0;right:0;background:var(--white);border-radius:0 0 var(--radius) var(--radius);box-shadow:var(--shadow-md);max-height:320px;overflow-y:auto;z-index:50;}.search-result{display:flex;justify-content:space-between;align-items:center;padding:0.75rem 1.25rem;color:var(--text);border-bottom:1px solid var(--border);}.search-result:hover{background:var(--primary-light);text-decoration:none;}.search-result-title{font-weight:600;font-size:0.9rem;}.search-result-type{font-size:0.75rem;color:var(--text-light);background:var(--bg);padding:0.15rem 0.5rem;border-radius:4px;}.search-empty{padding:1rem;text-align:center;color:var(--text-light);font-size:0.9rem;}.page-hero{padding:3rem 0;text-align:center;background:var(--primary-light);}.page-hero h1{font-size:2rem;color:var(--primary-dark);}.page-hero .hero-desc{color:var(--text-light);max-width:650px;margin:0.75rem auto 0;}.hero-meta{display:flex;gap:1.5rem;justify-content:center;margin-top:1.25rem;flex-wrap:wrap;}.hero-meta span{background:var(--white);padding:0.35rem 0.75rem;border-radius:50px;font-size:0.85rem;font-weight:700;color:var(--primary-dark);}section{padding:3rem 0;}section h2{font-size:1.5rem;margin-bottom:1.5rem;text-align:center;}.card-grid{display:grid;gap:1.25rem;}.card-grid--5{grid-template-columns:repeat(5,1fr);}.card-grid--4{grid-template-columns:repeat(4,1fr);}.card-grid--3{grid-template-columns:repeat(3,1fr);}.subject-card{display:flex;flex-direction:column;align-items:center;gap:0.5rem;padding:1.5rem 1rem;background:var(--white);border-radius:var(--radius);border:2px solid var(--border);text-align:center;transition:var(--transition);}.subject-card:hover{border-color:var(--card-color,var(--primary));box-shadow:var(--shadow-md);transform:translateY(-2px);text-decoration:none;}.subject-beast{font-size:1.75rem;}.subject-beast-img{width:80px;height:80px;}.subject-name{font-family:'Fredoka One',cursive;font-size:1rem;color:var(--text);}.course-card{display:block;padding:1.25rem;background:var(--white);border-radius:var(--radius);border:1px solid var(--border);transition:var(--transition);}.course-card:hover{border-color:var(--primary);box-shadow:var(--shadow-md);transform:translateY(-2px);text-decoration:none;}.course-card h3{font-size:1.05rem;color:var(--text);margin-bottom:0.35rem;}.course-level{display:inline-block;background:var(--accent-light);color:var(--accent);font-size:0.75rem;font-weight:700;padding:0.15rem 0.5rem;border-radius:4px;margin-bottom:0.5rem;}.course-meta{font-size:0.85rem;color:var(--text-light);}.unit-cards{display:flex;flex-direction:column;gap:1rem;counter-reset:unit;}.unit-card{display:block;padding:1.25rem 1.5rem;background:var(--white);border-radius:var(--radius);border:1px solid var(--border);transition:var(--transition);}.unit-card:hover{border-color:var(--primary);box-shadow:var(--shadow-md);text-decoration:none;}.unit-card-header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:0.5rem;}.unit-card-header h3{font-size:1.1rem;color:var(--text);}.difficulty{font-size:0.8rem;font-weight:700;padding:0.15rem 0.5rem;border-radius:4px;}.difficulty[data-level="Easy"]{background:#ECFDF5;color:#059669;}.difficulty[data-level="Medium"]{background:#FEF3C7;color:#D97706;}.difficulty[data-level="Hard"]{background:#FEE2E2;color:#DC2626;}.unit-card-meta{font-size:0.85rem;color:var(--text-light);margin-top:0.35rem;}.unit-card-topics{font-size:0.9rem;color:var(--text);margin-top:0.35rem;}.exam-weight{display:inline-block;font-size:0.75rem;color:var(--primary);font-weight:700;margin-top:0.35rem;}.unit-cta{display:inline-block;margin-top:0.5rem;color:var(--accent);font-weight:700;font-size:0.9rem;}.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem;text-align:center;}.step-number{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;background:var(--primary);color:var(--white);border-radius:50%;font-family:'Fredoka One',cursive;font-size:1.25rem;margin-bottom:0.75rem;}.step h3{font-size:1.1rem;margin-bottom:0.35rem;}.step p{font-size:0.9rem;color:var(--text-light);}.stats-bar{background:var(--primary-dark);color:var(--white);padding:2rem 0;}.stats-row{display:flex;justify-content:center;gap:3rem;flex-wrap:wrap;}.stat{text-align:center;}.stat-num{display:block;font-family:'Fredoka One',cursive;font-size:2rem;}.stat-label{font-size:0.85rem;opacity:0.8;}.faq-list{max-width:700px;margin:0 auto;}.faq-item{border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:0.75rem;background:var(--white);}.faq-item summary{padding:1rem 1.25rem;font-weight:700;cursor:pointer;font-size:0.95rem;}.faq-item summary:hover{color:var(--primary);}.faq-item p{padding:0 1.25rem 1rem;color:var(--text-light);font-size:0.9rem;}.facts-grid{display:flex;gap:2rem;justify-content:center;flex-wrap:wrap;}.fact{text-align:center;}.fact-label{display:block;font-size:0.8rem;color:var(--text-light);text-transform:uppercase;letter-spacing:0.05em;}.fact-value{display:block;font-family:'Fredoka One',cursive;font-size:1.1rem;color:var(--primary-dark);}.quick-links{display:flex;flex-wrap:wrap;gap:0.75rem;justify-content:center;}.quick-link{display:inline-flex;align-items:center;gap:0.5rem;padding:0.5rem 1rem;background:var(--white);border:1px solid var(--border);border-radius:50px;font-size:0.85rem;font-weight:600;transition:var(--transition);}.quick-link:hover{border-color:var(--primary);text-decoration:none;}.quick-link-course{font-size:0.75rem;color:var(--text-light);}.unit-meta-bar{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin-top:1rem;}.unit-meta-bar span{font-size:0.85rem;font-weight:600;}.unit-summary,.key-concepts,.study-tips{max-width:750px;margin-left:auto;margin-right:auto;}.concepts-list{padding-left:1.25rem;}.concepts-list li{margin-bottom:0.5rem;list-style:disc;}.game-mode-selector{display:flex;gap:0.5rem;flex-wrap:wrap;justify-content:center;margin-bottom:1.5rem;}.game-mode-btn{padding:0.5rem 1rem;border:2px solid var(--border);border-radius:50px;background:var(--white);font-family:inherit;font-weight:700;font-size:0.85rem;cursor:pointer;transition:var(--transition);}.game-mode-btn:hover,.game-mode-btn.active{border-color:var(--accent);color:var(--accent);background:var(--accent-light);}.game-canvas{background:var(--white);border:2px solid var(--border);border-radius:var(--radius);min-height:400px;display:flex;align-items:center;justify-content:center;}.game-placeholder{text-align:center;padding:2rem;}.game-placeholder p{margin-bottom:1rem;color:var(--text-light);}.btn{display:inline-block;padding:0.75rem 1.75rem;border-radius:50px;font-family:inherit;font-weight:700;font-size:1rem;cursor:pointer;border:none;transition:var(--transition);}.btn-primary{background:var(--accent);color:var(--white);}.btn-primary:hover{background:#E65100;text-decoration:none;}.prev-next{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;}.prev-next-link{padding:0.75rem 1.25rem;background:var(--white);border:1px solid var(--border);border-radius:var(--radius-sm);font-weight:600;font-size:0.9rem;transition:var(--transition);}.prev-next-link:hover{border-color:var(--primary);text-decoration:none;}.cross-silo{margin-top:1.5rem;text-align:center;}.cross-silo h3{font-size:1rem;margin-bottom:0.75rem;}.dc-link,.dc-cta{background:var(--primary-light);border-radius:var(--radius);max-width:750px;margin-left:auto;margin-right:auto;padding:1.5rem;text-align:center;}.dc-cta p{margin:0;}.breadcrumb{padding:0.75rem 0;}.breadcrumb ol{display:flex;align-items:center;gap:0.35rem;max-width:var(--max-w);margin:0 auto;padding:0 1.5rem;font-size:0.85rem;}.breadcrumb li::after{content:"/";margin-left:0.35rem;color:var(--text-light);}.breadcrumb li:last-child::after{content:"";}.breadcrumb a{color:var(--text-light);}.breadcrumb a:hover{color:var(--primary);}.site-footer{background:var(--primary-dark);color:var(--white);padding:3rem 0 1.5rem;margin-top:3rem;}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:2rem;margin-bottom:2rem;}.footer-brand .logo-text{color:var(--white);}.footer-brand p{font-size:0.85rem;opacity:0.7;margin-top:0.5rem;}.site-footer h4{font-size:0.9rem;margin-bottom:0.75rem;opacity:0.8;}.site-footer ul li{margin-bottom:0.35rem;}.site-footer a{color:rgba(255,255,255,0.7);font-size:0.85rem;}.site-footer a:hover{color:var(--white);}.footer-bottom{border-top:1px solid rgba(255,255,255,0.1);padding-top:1rem;text-align:center;font-size:0.8rem;opacity:0.6;}.section-note{text-align:center;color:var(--text-light);font-size:0.9rem;margin-bottom:1rem;}@media (max-width:768px){.card-grid--5,.card-grid--4,.card-grid--3{grid-template-columns:repeat(2,1fr);}.steps-grid{grid-template-columns:1fr;gap:1.5rem;}.footer-grid{grid-template-columns:1fr;}.hero h1{font-size:1.75rem;}.stats-row{gap:1.5rem;}.nav-toggle{display:block;}.main-nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--white);border-bottom:1px solid var(--border);padding:1rem;}.main-nav.open{display:block;}.main-nav ul{flex-direction:column;gap:0.75rem;}}@media (max-width:480px){.card-grid--5,.card-grid--4,.card-grid--3{grid-template-columns:1fr;}.hero-meta{flex-direction:column;align-items:center;}}.br-game{padding:1.5rem;}.br-header{display:flex;gap:1.5rem;justify-content:center;align-items:center;flex-wrap:wrap;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid var(--border);}.br-timer,.br-score,.br-streak,.br-progress{text-align:center;}.br-timer-icon{font-size:1.25rem;}.br-timer-value{font-family:'Fredoka One',cursive;font-size:1.5rem;color:var(--primary-dark);margin-left:0.25rem;}.br-timer-danger{color:#DC2626 !important;animation:pulse 0.5s infinite;}@keyframes pulse{0%,100%{opacity:1;}50%{opacity:0.5;}}.br-score-label,.br-streak-label{display:block;font-size:0.7rem;text-transform:uppercase;color:var(--text-light);letter-spacing:0.05em;}.br-score-value,.br-streak-value{font-family:'Fredoka One',cursive;font-size:1.25rem;color:var(--accent);}.br-progress-value{font-weight:700;}.br-progress-total{color:var(--text-light);}.br-question-area{max-width:650px;margin:0 auto;}.br-question-text{font-size:1.1rem;font-weight:700;margin-bottom:1.25rem;line-height:1.5;}.br-choices{display:flex;flex-direction:column;gap:0.6rem;}.br-choice{display:flex;align-items:center;gap:0.75rem;padding:0.85rem 1rem;background:var(--bg);border:2px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;font-family:inherit;font-size:0.95rem;text-align:left;transition:var(--transition);}.br-choice:hover{border-color:var(--primary);background:var(--primary-light);}.br-choice-letter{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;background:var(--white);border:1px solid var(--border);border-radius:50%;font-weight:700;font-size:0.8rem;flex-shrink:0;}.br-correct{border-color:#059669 !important;background:#ECFDF5 !important;}.br-correct .br-choice-letter{background:#059669;color:var(--white);border-color:#059669;}.br-wrong{border-color:#DC2626 !important;background:#FEE2E2 !important;}.br-wrong .br-choice-letter{background:#DC2626;color:var(--white);border-color:#DC2626;}.br-feedback{margin-top:1rem;padding:0.75rem 1rem;border-radius:var(--radius-sm);font-size:0.9rem;line-height:1.5;}.br-feedback-correct{background:#ECFDF5;color:#064E3B;border-left:3px solid #059669;}.br-feedback-wrong{background:#FEF3C7;color:#92400E;border-left:3px solid #D97706;}.br-timer-bar{height:4px;background:var(--border);border-radius:2px;margin-top:1.5rem;overflow:hidden;}.br-timer-fill{height:100%;background:var(--primary);transition:width 1s linear;width:100%;}.br-results{text-align:center;padding:2rem 1rem;}.br-results h3{font-size:1.5rem;color:var(--primary-dark);margin-bottom:1.5rem;}.br-results-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;margin-bottom:2rem;}.br-result-item{padding:1rem;background:var(--bg);border-radius:var(--radius-sm);}.br-result-num{display:block;font-family:'Fredoka One',cursive;font-size:1.5rem;color:var(--accent);}.br-result-label{font-size:0.75rem;text-transform:uppercase;color:var(--text-light);}.rq-item{border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:0.6rem;background:var(--white);}.rq-item summary{padding:0.85rem 1rem;cursor:pointer;font-size:0.95rem;line-height:1.5;}.rq-item summary:hover{color:var(--primary);}.rq-choices{padding:0 1rem;}.rq-choice{padding:0.4rem 0.5rem;margin-bottom:0.3rem;border-radius:4px;font-size:0.9rem;}.rq-choice-correct{background:#ECFDF5;font-weight:600;}.rq-letter{display:inline-block;width:20px;font-weight:700;color:var(--text-light);}.rq-check{color:#059669;font-weight:700;}.rq-explanation{padding:0.5rem 1rem 0.85rem;font-size:0.85rem;color:var(--text-light);font-style:italic;}@media (max-width:480px){.br-results-grid{grid-template-columns:repeat(2,1fr);}.br-header{gap:1rem;}}