*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #6366f1;--primary-dark: #4f46e5;--secondary: #8b5cf6;--success: #10b981;--danger: #ef4444;--warning: #f59e0b;--dark: #1f2937;--gray: #6b7280;--light: #f3f4f6;--white: #ffffff}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;color:var(--dark)}.container{max-width:1400px;margin:0 auto;padding:2rem}header{background:#fffffff2;backdrop-filter:blur(10px);border-radius:20px;padding:2rem;margin-bottom:2rem;box-shadow:0 20px 40px #0000001a;animation:slideDown .5s ease-out}@keyframes slideDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.logo{display:flex;align-items:center;gap:1rem;margin-bottom:1rem}.logo h1{font-size:2.5rem;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.tagline{color:var(--gray);font-size:1.1rem;margin-bottom:1rem}.user-types{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:1rem}.user-badge{background:var(--light);padding:.4rem .8rem;border-radius:20px;font-size:.85rem;color:var(--dark);transition:all .3s;cursor:pointer}.user-badge:hover{background:var(--primary);color:#fff;transform:translateY(-2px)}.main-content{display:grid;grid-template-columns:1fr 1fr;gap:2rem;margin-bottom:2rem}@media (max-width: 968px){.main-content{grid-template-columns:1fr}}.input-panel,.output-panel{background:#fff;border-radius:20px;padding:2rem;box-shadow:0 20px 40px #0000001a;animation:fadeIn .6s ease-out}@keyframes 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.3s;text-align:center}.option-card:hover{border-color:var(--primary);background:#6366f10d;transform:translateY(-2px)}.option-card.selected{border-color:var(--primary);background:#6366f11a}.generate-btn{width:100%;padding:1rem;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border:none;border-radius:10px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .3s;position:relative;overflow:hidden}.generate-btn:hover{transform:translateY(-2px);box-shadow:0 10px 20px #6366f14d}.generate-btn:active{transform:translateY(0)}.generate-btn.loading{pointer-events:none;opacity:.8}.generate-btn:disabled{opacity:.7;cursor:not-allowed;background:#a0aec0}.generate-btn.loading:after{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.3),transparent);animation:loading 1.5s infinite}@keyframes loading{to{left:100%}}.output-tabs{display:flex;gap:.5rem;margin-bottom:1.5rem;border-bottom:2px solid var(--light);padding-bottom:.5rem}.tab{padding:.5rem 1rem;background:transparent;border:none;border-radius:10px 10px 0 0;cursor:pointer;font-weight:500;color:var(--gray);transition:all .3s}.tab:hover{background:var(--light)}.tab.active{background:var(--primary);color:#fff}.tab-content{display:none;animation:fadeIn .3s ease-out}.tab-content.active{display:block}.lesson-section{margin-bottom:2rem;padding:1.5rem;background:var(--light);border-radius:10px;border-left:4px solid var(--primary)}.lesson-section h3{color:var(--primary);margin-bottom:1rem}.quiz-question{margin-bottom:1.5rem;padding:1rem;background:#fff;border-radius:10px;border:2px solid var(--light)}.quiz-question h4{color:var(--dark);margin-bottom:.5rem}.quiz-options{margin-left:1rem}.quiz-option{margin:.5rem 0;padding:.5rem;background:var(--light);border-radius:5px;transition:all .3s}.quiz-option.correct{background:#10b9811a;border-left:3px solid var(--success)}.export-buttons{display:flex;gap:1rem;margin-top:2rem;flex-wrap:wrap}.export-btn{flex:1;min-width:150px;padding:.75rem;background:#fff;border:2px solid var(--primary);color:var(--primary);border-radius:10px;font-weight:600;cursor:pointer;transition:all .3s}.export-btn:hover{background:var(--primary);color:#fff;transform:translateY(-2px)}.timer{position:fixed;bottom:2rem;right:2rem;background:#fff;padding:1rem 1.5rem;border-radius:50px;box-shadow:0 10px 30px #0003;display:none;align-items:center;gap:.5rem;animation:slideUp .5s ease-out}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.timer.active{display:flex}.timer-text{font-weight:600;color:var(--primary)}.standards-list{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.5rem}.standard-tag{background:#6366f11a;color:var(--primary);padding:.3rem .6rem;border-radius:5px;font-size:.85rem;font-weight:500}.activity-card{background:#fff;padding:1rem;border-radius:10px;margin:.5rem 0;border:2px solid var(--light);transition:all .3s}.activity-card:hover{border-color:var(--primary);transform:translate(5px)}.sub-pack-notice{background:linear-gradient(135deg,#f59e0b1a,#ef44441a);border:2px solid var(--warning);border-radius:10px;padding:1rem;margin-top:1rem;display:flex;align-items:center;gap:.5rem}.sub-pack-notice:before{content:"📋";font-size:1.5rem}