*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #7C3AED;--primary-hover: #6D28D9;--primary-light: #EDE9FE;--primary-mid: #DDD6FE;--success: #22C55E;--success-light: #DCFCE7;--danger: #EF4444;--danger-light: #FEE2E2;--warning: #F59E0B;--warning-light: #FEF3C7;--bg: #F5F3FF;--card: #FFFFFF;--text: #1E1B4B;--text-secondary: #6B7280;--border: #E9E4F9;--radius: 16px;--radius-sm: 10px;--shadow-sm: 0 1px 3px rgba(124,58,237,.07), 0 1px 2px rgba(0,0,0,.04);--shadow-md: 0 4px 16px rgba(124,58,237,.12), 0 2px 4px rgba(0,0,0,.04);--shadow-lg: 0 12px 36px rgba(124,58,237,.18), 0 4px 8px rgba(0,0,0,.06);--shadow-glow: 0 0 0 3px rgba(124,58,237,.15)}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideDown{0%{opacity:0;transform:translateY(-12px)}to{opacity:1;transform:translateY(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}@keyframes popIn{0%{transform:scale(.7);opacity:0}70%{transform:scale(1.08)}to{transform:scale(1);opacity:1}}@keyframes bounceIn{0%{transform:scale(0);opacity:0}50%{transform:scale(1.15);opacity:1}75%{transform:scale(.95)}to{transform:scale(1)}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}@keyframes wiggle{0%,to{transform:rotate(0)}20%{transform:rotate(-6deg)}40%{transform:rotate(6deg)}60%{transform:rotate(-4deg)}80%{transform:rotate(4deg)}}@keyframes shimmer{0%{background-position:-200% center}to{background-position:200% center}}@keyframes drawCircle{0%{stroke-dashoffset:283}to{stroke-dashoffset:0}}@keyframes drawCheck{0%{stroke-dashoffset:120}to{stroke-dashoffset:0}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes progressAI{0%{width:0%}to{width:88%}}@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}body{font-family:-apple-system,BlinkMacSystemFont,Inter,Segoe UI,Roboto,sans-serif;background-color:#f9f8ff;background-image:radial-gradient(#DDD6FE 1px,transparent 1px);background-size:24px 24px;color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased}.container{max-width:600px;margin:0 auto;padding:16px;animation:fadeIn .35s ease both;position:relative;z-index:0}.nav-bar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:#fffffff5;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10;box-shadow:0 1px 12px #7c3aed12}.nav-bar-centered{display:grid;grid-template-columns:1fr auto 1fr}.nav-bar-centered>*:first-child{justify-self:start}.nav-bar-centered>*:nth-child(2){justify-self:center}.nav-bar-centered>*:last-child{justify-self:end}.nav-bar:after{content:"";position:absolute;bottom:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--primary),#A78BFA,var(--primary));background-size:200% 100%;animation:gradientShift 4s ease infinite}.nav-bar h2{font-size:1.05rem;font-weight:800;background:linear-gradient(135deg,var(--primary),#A855F7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:-.02em;padding:2px 4px}.nav-logo{display:flex;align-items:center;gap:8px;text-decoration:none}.nav-logo img{width:32px;height:32px;border-radius:8px;animation:float 3s ease-in-out infinite}.back-btn{display:inline-flex;align-items:center;gap:6px;background:var(--primary-light);border:none;color:var(--primary);font-size:.875rem;cursor:pointer;padding:7px 14px;border-radius:99px;font-weight:600;transition:all .2s ease;white-space:nowrap}.back-btn:hover{background:var(--primary-mid);transform:translate(-3px);box-shadow:var(--shadow-sm)}.back-btn:active{transform:scale(.95) translate(-2px)}.page-header{display:flex;align-items:center;justify-content:space-between;padding:16px 0;margin-bottom:16px}.page-header h1{font-size:1.6rem;font-weight:800;letter-spacing:-.04em;color:var(--text)}.card{background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:12px;box-shadow:var(--shadow-sm);transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease}.card:hover{border-color:#c4b5fd;box-shadow:var(--shadow-md)}.card[style*="cursor: pointer"]:hover,.card[style*="cursor:pointer"]:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}.card h3{font-size:1rem;font-weight:700;margin-bottom:4px;color:var(--text)}.card p{color:var(--text-secondary);font-size:.875rem}.classroom-card{position:relative;overflow:hidden;cursor:pointer;padding-left:20px}.classroom-card:before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(180deg,var(--primary),#A855F7);border-radius:4px 0 0 4px}.classroom-card:hover{transform:translateY(-3px)!important}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 24px;border-radius:var(--radius);border:none;font-size:1rem;font-weight:700;cursor:pointer;width:100%;transition:all .18s ease;letter-spacing:-.01em;position:relative;overflow:hidden}.btn:active{transform:scale(.97)}.btn:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:#fff0;transition:background .15s}.btn:hover:after{background:#ffffff1a}.btn-primary{background:linear-gradient(135deg,var(--primary) 0%,#9333EA 100%);color:#fff;box-shadow:0 4px 14px #7c3aed66}.btn-primary:hover:not(:disabled){box-shadow:0 6px 20px #7c3aed80;transform:translateY(-2px)}.btn-primary:active{transform:scale(.97) translateY(0);box-shadow:0 2px 8px #7c3aed4d}.btn-primary:disabled{opacity:.65;cursor:not-allowed;transform:none;box-shadow:none}.btn-cta{background:linear-gradient(135deg,var(--primary),#9333EA,#A855F7,var(--primary));background-size:300% 300%;animation:gradientShift 3s ease infinite,ctaGlow 2s ease-in-out infinite}@keyframes ctaGlow{0%,to{box-shadow:0 4px 16px #7c3aed66}50%{box-shadow:0 6px 28px #7c3aedbf,0 0 0 4px #7c3aed26}}.btn-secondary{background:#fff;color:var(--primary);border:2px solid #C4B5FD;box-shadow:var(--shadow-sm)}.btn-secondary:hover:not(:disabled){background:var(--primary-light);border-color:var(--primary);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-success{background:linear-gradient(135deg,#22c55e,#16a34a);color:#fff;box-shadow:0 4px 14px #22c55e59}.btn-success:hover:not(:disabled){box-shadow:0 6px 20px #22c55e73;transform:translateY(-2px)}.btn-success:disabled{opacity:.65;cursor:not-allowed;transform:none}.btn-danger{background:linear-gradient(135deg,var(--danger),#DC2626);color:#fff;box-shadow:0 4px 14px #ef44444d}.btn-danger:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #ef444466}.btn-ghost{background:transparent;color:var(--text-secondary);border:none;width:auto;padding:8px 12px}.btn-ghost:hover{background:var(--primary-light);color:var(--primary)}.btn-small{padding:8px 16px;font-size:.875rem;width:auto;border-radius:var(--radius-sm)}.input-group{margin-bottom:16px}.input-group label{display:block;font-size:.875rem;font-weight:700;margin-bottom:6px;color:var(--text)}.input-group input,.input-group textarea,.input-group select{width:100%;padding:12px 14px;border:2px solid var(--border);border-radius:var(--radius-sm);font-size:1rem;transition:border-color .2s ease,box-shadow .2s ease;background:#fff;color:var(--text)}.input-group input:focus,.input-group textarea:focus,.input-group select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #7c3aed1f}.error-msg{background:var(--danger-light);color:var(--danger);padding:12px 14px;border-radius:var(--radius-sm);margin-bottom:16px;font-size:.875rem;border-left:3px solid var(--danger);animation:slideDown .2s ease}.success-msg{background:var(--success-light);color:#166534;padding:12px 14px;border-radius:var(--radius-sm);margin-bottom:16px;font-size:.875rem;border-left:3px solid var(--success);animation:slideDown .2s ease}.badge{display:inline-flex;align-items:center;padding:4px 12px;border-radius:20px;font-size:.75rem;font-weight:700;letter-spacing:.02em;text-transform:uppercase}.badge-success{background:var(--success-light);color:#166534}.badge-warning{background:var(--warning-light);color:#92400e}.badge-danger{background:var(--danger-light);color:#991b1b}.badge-info{background:var(--primary-light);color:var(--primary)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#1e1b4b80;z-index:50;display:flex;align-items:center;justify-content:center;padding:20px;animation:fadeIn .2s ease;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal{background:#fff;border-radius:20px;padding:28px 24px 24px;width:100%;max-width:440px;box-shadow:0 24px 64px #7c3aed40;animation:scaleIn .25s cubic-bezier(.17,.67,.3,1.2)}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.modal-header h2{font-size:1.2rem;font-weight:800;color:var(--text);letter-spacing:-.03em}.modal-close{width:34px;height:34px;border-radius:50%;background:var(--bg);border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.1rem;color:var(--text-secondary);transition:all .15s;flex-shrink:0}.modal-close:hover{background:var(--danger-light);color:var(--danger);transform:rotate(90deg)}.question-card{background:var(--card);border:1.5px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:16px;box-shadow:var(--shadow-sm);animation:slideUp .25s ease both;transition:border-color .2s ease,box-shadow .2s ease}.question-card:hover{border-color:#c4b5fd}.question-card h3{font-size:1.05rem;font-weight:600;margin-bottom:14px;line-height:1.5;color:var(--text)}.question-number{color:var(--primary);font-weight:700;font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;margin-bottom:8px}.option-btn{display:block;width:100%;padding:14px 16px;margin-bottom:8px;border:2px solid var(--border);border-radius:var(--radius-sm);background:#fff;text-align:left;font-size:.95rem;cursor:pointer;transition:all .18s ease;color:var(--text)}.option-btn:hover{border-color:var(--primary);background:var(--primary-light);transform:translate(4px)}.option-btn.selected{border-color:var(--primary);background:var(--primary-light);font-weight:600;box-shadow:var(--shadow-glow);transform:translate(4px)}.option-btn.correct{border-color:var(--success);background:var(--success-light)}.option-btn.wrong{border-color:var(--danger);background:var(--danger-light)}.code-display{background:linear-gradient(135deg,var(--primary-light),#F5F3FF);border:2px dashed #C4B5FD;border-radius:var(--radius);padding:20px;text-align:center;margin:12px 0}.code-display .code{font-size:2.4rem;font-weight:900;letter-spacing:.4em;background:linear-gradient(135deg,var(--primary),#A855F7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.code-display p{color:var(--text-secondary);font-size:.8rem;margin-top:4px}.student-row{display:flex;align-items:center;justify-content:space-between;padding:12px 0;border-bottom:1px solid var(--border);transition:background .15s}.student-row:last-child{border-bottom:none}.score-circle{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.8rem;color:#fff;box-shadow:0 2px 6px #00000026;animation:popIn .4s ease both}.loading{text-align:center;padding:48px;color:var(--text-secondary)}.loading:before{content:"";display:block;width:36px;height:36px;border:3px solid var(--primary-light);border-top-color:var(--primary);border-radius:50%;margin:0 auto 16px;animation:spin .7s linear infinite}.empty-state{text-align:center;padding:56px 20px;color:var(--text-secondary);animation:fadeIn .4s ease}.empty-state .empty-icon{font-size:3.5rem;margin-bottom:16px;display:block;animation:float 3s ease-in-out infinite}.empty-state h3{margin-bottom:8px;color:var(--text);font-size:1.1rem;font-weight:700}.logout-btn{background:none;border:1.5px solid var(--border);color:var(--text-secondary);font-size:.8rem;cursor:pointer;transition:all .15s;padding:6px 12px;border-radius:99px;font-weight:600}.logout-btn:hover{border-color:var(--danger);color:var(--danger);background:var(--danger-light)}.divider{text-align:center;color:var(--text-secondary);margin:24px 0;font-size:.875rem}.flex-between{display:flex;align-items:center;justify-content:space-between}.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mb-16{margin-bottom:16px}.text-center{text-align:center}.text-small{font-size:.875rem}.text-muted{color:var(--text-secondary)}a{color:var(--primary);text-decoration:none;font-weight:600}.ai-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:linear-gradient(135deg,#f5f3ff,#ede9fe);z-index:100;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px;animation:fadeIn .3s ease}.ai-overlay-logo{display:flex;align-items:center;gap:10px;font-size:1.5rem;font-weight:800;background:linear-gradient(135deg,var(--primary),#A855F7);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:-.03em;margin-bottom:40px}.ai-overlay-logo img{width:44px;height:44px;border-radius:12px;animation:float 2.5s ease-in-out infinite;-webkit-text-fill-color:initial}.ai-progress-track{width:100%;max-width:320px;height:8px;background:#ddd6fe;border-radius:99px;overflow:hidden;margin-bottom:16px}.ai-progress-bar{height:100%;border-radius:99px;background:linear-gradient(90deg,var(--primary),#A855F7,#7C3AED);background-size:200% 100%;animation:progressAI 9s cubic-bezier(.1,.4,.2,1) forwards,gradientShift 2s ease infinite;transition:width .4s ease}.ai-progress-bar.done{animation:none;width:100%!important;background:linear-gradient(90deg,var(--success),#4ADE80);transition:width .3s ease,background .3s ease}.ai-status{font-size:.95rem;color:var(--primary);font-weight:600;min-height:24px;transition:opacity .3s;margin-bottom:8px;text-align:center}.success-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:linear-gradient(135deg,#f5f3ff,#ede9fe);z-index:100;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px;animation:fadeIn .4s ease}.success-check-svg{animation:bounceIn .5s cubic-bezier(.17,.67,.3,1.3) both;margin-bottom:28px}.success-check-svg .check-circle{stroke-dasharray:283;stroke-dashoffset:283;animation:drawCircle .6s ease forwards .1s}.success-check-svg .check-mark{stroke-dasharray:120;stroke-dashoffset:120;animation:drawCheck .4s ease forwards .55s}.success-title{font-size:1.6rem;font-weight:800;color:var(--text);letter-spacing:-.03em;margin-bottom:8px;text-align:center;animation:slideUp .4s ease both .7s;opacity:0;animation-fill-mode:forwards}.success-subtitle{font-size:.95rem;color:var(--text-secondary);margin-bottom:32px;text-align:center;animation:slideUp .4s ease both .85s;opacity:0;animation-fill-mode:forwards}.success-actions{display:flex;flex-direction:column;gap:10px;width:100%;max-width:320px;animation:slideUp .4s ease both 1s;opacity:0;animation-fill-mode:forwards}.home-page{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px 20px;text-align:center;gap:0}.home-mascot{width:200px;height:200px;border-radius:0;margin-bottom:12px;animation:float 3s ease-in-out infinite;filter:drop-shadow(0 16px 32px rgba(124,58,237,.3))}.nav-logo img{border-radius:8px}.home-title{font-size:2.6rem;font-weight:900;letter-spacing:-.03em;background:linear-gradient(135deg,var(--primary) 0%,#A855F7 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;display:inline-block;padding:0 6px;margin-bottom:6px}.home-subtitle{font-size:1rem;color:var(--text-secondary);margin-bottom:28px;max-width:260px;line-height:1.5}.home-actions{display:flex;flex-direction:column;gap:12px;width:100%;max-width:300px}.classroom-avatar{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:800;color:#fff;flex-shrink:0;background:linear-gradient(135deg,var(--primary),#A855F7);box-shadow:0 4px 12px #7c3aed4d;letter-spacing:-.02em}.alice-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f0a2873;z-index:8000;animation:fadeIn .25s ease}.tutorial-highlight{position:relative;z-index:8100!important;box-shadow:0 0 0 4px var(--primary),0 0 24px #7c3aed80!important;border-radius:var(--radius-sm)!important;animation:tutorialPulse 1.8s ease-in-out infinite!important}@keyframes tutorialPulse{0%,to{box-shadow:0 0 0 4px var(--primary),0 0 16px #7c3aed66}50%{box-shadow:0 0 0 6px var(--primary),0 0 32px #7c3aeda6}}.alice-tutorial-container{position:fixed;bottom:28px;right:24px;z-index:8200;display:flex;flex-direction:column;align-items:flex-end;gap:0;animation:slideUp .3s cubic-bezier(.34,1.56,.64,1)}.alice-bubble{background:#fff;border-radius:20px 20px 4px;padding:20px 20px 16px;box-shadow:0 8px 32px #7c3aed38,0 2px 8px #00000014;max-width:320px;min-width:260px;border:1.5px solid var(--primary-mid);position:relative;margin-right:12px;margin-bottom:6px}.alice-bubble:after{content:"";position:absolute;bottom:-12px;right:16px;width:0;height:0;border-left:12px solid transparent;border-right:0px solid transparent;border-top:12px solid var(--primary-mid)}.alice-bubble:before{content:"";position:absolute;bottom:-10px;right:17px;width:0;height:0;border-left:11px solid transparent;border-right:0px solid transparent;border-top:11px solid #fff;z-index:1}.alice-bubble-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:10px;gap:8px}.alice-bubble-title{font-size:.95rem;font-weight:700;color:var(--primary);line-height:1.3}.alice-close-btn{background:none;border:none;cursor:pointer;font-size:.8rem;color:var(--text-secondary);padding:2px 6px;border-radius:50%;line-height:1;flex-shrink:0;transition:background .15s,color .15s}.alice-close-btn:hover{background:var(--danger-light);color:var(--danger)}.alice-bubble-text{font-size:.875rem;color:var(--text);line-height:1.55;margin-bottom:14px}.alice-bubble-footer{display:flex;justify-content:space-between;align-items:center;gap:12px}.alice-step-dots{display:flex;gap:5px;align-items:center}.alice-dot{width:6px;height:6px;border-radius:50%;background:var(--border);transition:background .2s,transform .2s}.alice-dot-active{background:var(--primary);transform:scale(1.35)}.alice-nav-btns{display:flex;gap:6px}.alice-btn{border:none;border-radius:10px;padding:7px 14px;font-size:.8rem;font-weight:600;cursor:pointer;transition:all .15s ease;white-space:nowrap}.alice-btn-primary{background:var(--primary);color:#fff}.alice-btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px);box-shadow:0 3px 10px #7c3aed59}.alice-btn-secondary{background:var(--primary-light);color:var(--primary)}.alice-btn-secondary:hover{background:var(--primary-mid)}.alice-mascot-wrapper{display:flex;justify-content:flex-end;padding-right:0}.alice-mascot-img{width:72px;height:72px;animation:float 3s ease-in-out infinite;filter:drop-shadow(0 4px 12px rgba(124,58,237,.3))}.alice-help-btn{position:fixed;bottom:24px;right:24px;z-index:7999;background:none;border:none;cursor:pointer;padding:0;display:flex;align-items:center;justify-content:center;transition:transform .2s}.alice-help-btn:hover{transform:scale(1.1) translateY(-2px)}.alice-help-avatar{width:90px;height:90px;animation:float 3s ease-in-out infinite;filter:drop-shadow(0 4px 10px rgba(124,58,237,.35))}.alice-help-badge{position:absolute;top:2px;right:2px;background:var(--primary);color:#fff;border-radius:50%;width:22px;height:22px;font-size:.78rem;font-weight:800;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 6px #7c3aed66;border:2px solid white}