:root{--bg-main: #F8F7FF;--bg-sidebar: #5B21B6;--accent: #7C3AED;--accent-light: #F5F3FF;--accent-hover: #6D28D9;--accent-glow: rgba(124, 58, 237, .15);--mint: #10B981;--mint-light: #ECFDF5;--text-primary: #111827;--text-secondary: #6B7280;--text-nav: rgba(255, 255, 255, .8);--text-nav-active: #5B21B6;--border: #E5E7EB;--card-bg: #FFFFFF;--card-shadow: 0 20px 50px rgba(0, 0, 0, .08);--card-shadow-hover: 0 30px 70px rgba(124, 58, 237, .12);--card-radius: 32px;--red: #EF4444;--red-light: #FEF2F2;--green: #10B981;--green-light: #ECFDF5;--amber: #F59E0B}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:linear-gradient(135deg,#f8f7ff,#fff,#f3e8ff);background-size:400% 400%;animation:aurora 8s ease infinite;color:var(--text-primary);-webkit-font-smoothing:antialiased;min-height:100vh}@keyframes aurora{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}*{scrollbar-width:thin;scrollbar-color:rgba(124,58,237,.2) transparent}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#7c3aed1a;border-radius:10px;transition:background .3s ease}::-webkit-scrollbar-thumb:hover{background:#7c3aed4d}h1{font-size:1.75rem;font-weight:700;letter-spacing:-.02em;color:var(--text-primary)}h2{font-size:1.375rem;font-weight:700;letter-spacing:-.01em;color:var(--text-primary)}h3{font-size:1.125rem;font-weight:600;color:var(--text-primary)}.greeting{font-size:36px;font-weight:800;color:#000;margin-bottom:40px;letter-spacing:-.03em}.label{font-size:13px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin-bottom:24px}.app-shell{display:flex;min-height:100vh;background:linear-gradient(135deg,#f8f7ff,#fff,#f3e8ff);background-size:400% 400%;animation:aurora 8s ease infinite}.sidebar{width:280px;padding:40px 20px;display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100;background:var(--bg-sidebar);box-shadow:inset -10px 0 30px #ffffff0d;border-right:1px solid rgba(255,255,255,.1)}.sidebar-brand{font-size:28px;font-weight:900;color:#fff;padding-left:16px;margin-bottom:48px;letter-spacing:-.04em;text-shadow:0 4px 12px rgba(0,0,0,.2)}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr)!important;gap:24px;margin-bottom:64px;width:100%}.nav-link{display:flex;align-items:center;width:100%;height:52px;padding:0 20px;color:var(--text-nav);text-decoration:none;border-radius:50px;transition:all .25s cubic-bezier(.4,0,.2,1);font-weight:700;font-size:1rem;margin-bottom:8px}.nav-link:hover{background:#ffffff1a;color:#fff;transform:translate(4px)}.nav-link.active{background:#fff;color:var(--text-nav-active);box-shadow:0 10px 25px #0003}.nav-icon{margin-right:14px;display:flex;align-items:center}.main-content{margin-left:280px;flex:1;padding:48px;max-width:1200px;animation:pageIn .5s cubic-bezier(.16,1,.3,1)}@keyframes pageIn{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.card{background:var(--card-bg);border:none;border-radius:var(--card-radius);box-shadow:var(--card-shadow);padding:32px;transition:all .4s cubic-bezier(.16,1,.3,1);position:relative;overflow:hidden}.card:before{content:"";position:absolute;top:0;left:0;right:0;height:50%;background:linear-gradient(to bottom,rgba(255,255,255,.8) 0%,transparent 100%);pointer-events:none;z-index:1}.card:hover{box-shadow:var(--card-shadow-hover);transform:translateY(-8px) scale(1.01)}.stat-card{background:linear-gradient(135deg,#fff,#f8f6ff);box-shadow:0 25px 60px #0000001a;padding:24px 32px;display:flex;flex-direction:column;justify-content:space-between;min-height:160px}.stat-card:before{background:linear-gradient(to bottom,rgba(255,255,255,1) 0%,transparent 100%)}.stat-card:after{content:"";position:absolute;top:0;right:0;width:120px;height:120px;background:radial-gradient(circle at top right,rgba(124,58,237,.08),transparent)}.stat-label{font-size:13px;font-weight:800;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.08em;position:relative;z-index:2}.stat-value{font-size:48px;font-weight:900;color:var(--accent);margin-top:8px;letter-spacing:-.02em;position:relative;z-index:2;text-shadow:2px 4px 8px rgba(124,58,237,.15)}.library-item-card{display:flex;justify-content:space-between;align-items:center;padding:24px 32px;margin-bottom:20px;background:#fff;border-radius:24px;box-shadow:var(--card-shadow);transition:all .4s cubic-bezier(.16,1,.3,1);border:1px solid rgba(124,58,237,.05)}.library-item-card:hover{transform:translate(12px) scale(1.005);border-color:var(--accent);box-shadow:var(--card-shadow-hover)}.item-title{font-size:1.15rem;font-weight:800;color:var(--text-primary);line-height:1.4}.item-meta{font-size:.85rem;color:var(--text-secondary);font-weight:700}.topic-tag{display:inline-block;padding:4px 12px;border-radius:50px;font-size:.75rem;font-weight:800;background:var(--accent-light);color:var(--accent);text-transform:capitalize}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}.skeleton{background:linear-gradient(90deg,#e5e7eb 25%,#f3f4f6,#e5e7eb 75%);background-size:200% 100%;animation:shimmer 1.5s ease-in-out infinite;border-radius:16px}.skeleton-card{background:linear-gradient(90deg,#e5e7eb 25%,#f3f4f6,#e5e7eb 75%);background-size:200% 100%;animation:shimmer 1.5s ease-in-out infinite;border-radius:24px;height:120px;margin-bottom:20px}.skeleton-stat{background:linear-gradient(90deg,#e5e7eb 25%,#f3f4f6,#e5e7eb 75%);background-size:200% 100%;animation:shimmer 1.5s ease-in-out infinite;border-radius:24px;height:160px}.skeleton-detail-line{background:linear-gradient(90deg,#e5e7eb 25%,#f3f4f6,#e5e7eb 75%);background-size:200% 100%;animation:shimmer 1.5s ease-in-out infinite;border-radius:12px;height:20px;margin-bottom:16px}.skeleton-detail-block{background:linear-gradient(90deg,#e5e7eb 25%,#f3f4f6,#e5e7eb 75%);background-size:200% 100%;animation:shimmer 1.5s ease-in-out infinite;border-radius:24px;height:100px;margin-bottom:24px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:14px 28px;border-radius:16px;font-weight:700;font-size:1rem;border:none;cursor:pointer;transition:all .3s cubic-bezier(.16,1,.3,1);font-family:inherit;position:relative;overflow:hidden}.btn:active{transform:scale(.96)}.btn-primary{background:linear-gradient(to bottom,#8b5cf6,#7c3aed);color:#fff;box-shadow:0 8px 20px #7c3aed4d,inset 0 1px 1px #ffffff4d}.btn-primary:hover:not(:disabled){background:linear-gradient(to bottom,#9061ff,#8549ff);box-shadow:0 12px 28px #7c3aed66,inset 0 1px 1px #fff6;transform:translateY(-3px)}.btn-secondary{background:#fff;color:var(--text-primary);border:2px solid var(--border);box-shadow:0 4px 12px #0000000d}.btn-secondary:hover:not(:disabled){background:#f9fafb;border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}.btn-add-content{background:#fff;color:var(--bg-sidebar);font-weight:800;width:100%;margin-bottom:40px;border-radius:18px;padding:16px 24px;box-shadow:0 15px 30px #0003,inset 0 1px 2px #fffc;font-size:1.1rem;border-top:2px solid rgba(255,255,255,.5)}.btn-add-content:hover{transform:translateY(-5px) scale(1.02);box-shadow:0 20px 40px #00000040}.input{width:100%;padding:14px 20px;border-radius:14px;border:1px solid var(--border);background:#fff;font-family:inherit;font-size:1rem;transition:all .2s ease;box-shadow:inset 0 2px 4px #0000000d}.input:focus{outline:none;border-color:var(--accent);box-shadow:inset 0 2px 4px #0000000d,0 0 0 4px var(--accent-glow)}.modal{width:100%;max-width:500px;background:#fff;border-radius:36px;box-shadow:0 40px 100px #0000004d;padding:48px;position:relative;overflow:hidden}.modal:before{content:"";position:absolute;top:0;left:0;right:0;height:100px;background:linear-gradient(to bottom,rgba(255,255,255,1) 0%,transparent 100%);pointer-events:none}.quiz-card{height:100%;display:flex;flex-direction:column;justify-content:space-between;border-radius:32px}.quiz-hub-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}.notes-editor{background-image:repeating-linear-gradient(to bottom,transparent,transparent 27px,#E5E7EB 27px,#E5E7EB 28px);line-height:28px;padding:40px;border:none;border-radius:36px;background-color:#fff;font-size:18px;min-height:600px;box-shadow:0 30px 80px #0000001a}.challenge-option{background:#fff;border:2px solid var(--border);border-radius:20px;padding:24px;font-weight:700;font-size:1.1rem;transition:all .3s cubic-bezier(.16,1,.3,1);box-shadow:0 8px 20px #0000000d;margin-bottom:16px}.challenge-option:hover:not(:disabled){border-color:var(--accent);transform:translate(12px) scale(1.02);box-shadow:0 12px 30px #7c3aed26}.challenge-option.selected{border-color:var(--accent);background:var(--accent-light)}.challenge-option.correct{border-color:var(--green);background:var(--green-light);color:var(--green)}.challenge-option.incorrect{border-color:var(--red);background:var(--red-light);color:var(--red)}.flex{display:flex}.justify-between{justify-content:space-between}.justify-center{justify-content:center}.items-center{align-items:center}.items-start{align-items:flex-start}.gap-12{gap:12px}.gap-16{gap:16px}.gap-64{gap:64px}.mt-24{margin-top:24px}.mt-32{margin-top:32px}.mb-16{margin-bottom:16px}.mb-24{margin-bottom:24px}.mb-32{margin-bottom:32px}.mb-48{margin-bottom:48px}.mb-64{margin-bottom:64px}.subtitle{color:var(--text-secondary);font-weight:600;font-size:.95rem;line-height:1.6}.banner{padding:16px 20px;border-radius:16px;font-weight:700;font-size:.9rem;display:flex;align-items:center;gap:12px}.banner-error{background:var(--red-light);color:var(--red);border:1px solid rgba(239,68,68,.2)}.banner span{flex-shrink:0;font-weight:800}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:100;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-actions{display:flex;gap:12px;margin-top:32px}.input-group{margin-bottom:24px}.input-group label{display:block;font-size:.75rem;font-weight:800;letter-spacing:.08em;color:var(--text-secondary);margin-bottom:8px;text-transform:uppercase}.spinner{width:20px;height:20px;border:3px solid rgba(124,58,237,.2);border-top-color:var(--accent);border-radius:50%;animation:spin .6s linear infinite;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.success-toast{position:fixed;top:32px;left:50%;transform:translate(-50%);background:#fff;border-radius:20px;padding:20px 32px;box-shadow:0 20px 60px #0003,0 0 0 1px #7c3aed1a;display:flex;align-items:center;gap:16px;z-index:200;animation:toastIn .5s cubic-bezier(.16,1,.3,1);min-width:320px}@keyframes toastIn{0%{opacity:0;transform:translate(-50%) translateY(-20px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.toast-checkmark{width:40px;height:40px;border-radius:50%;background:var(--green);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0}.toast-content{flex:1}.toast-title{font-weight:800;font-size:.95rem;color:var(--text-primary)}.toast-message{font-size:.85rem;color:var(--text-secondary);font-weight:600}.toast-topic{display:inline-block;margin-left:6px;padding:2px 8px;background:var(--accent-light);color:var(--accent);border-radius:8px;font-weight:700;font-size:.8rem}.btn-full{width:100%}.btn-ghost{background:transparent;border:none;color:var(--text-secondary);font-weight:700;font-size:.9rem;cursor:pointer;padding:8px 16px;border-radius:12px;transition:all .2s ease}.btn-ghost:hover{background:#0000000a;color:var(--text-primary)}.btn-mint{background:var(--mint);color:#fff;font-weight:700;box-shadow:0 8px 20px #10b9814d}.btn-mint:hover:not(:disabled){background:#059669;transform:translateY(-3px);box-shadow:0 12px 28px #10b98166}.insights-list{padding-left:20px;display:flex;flex-direction:column;gap:14px}.insights-list li{font-size:1rem;line-height:1.7;color:var(--text-primary);font-weight:500;padding-left:4px}.insights-list li::marker{color:var(--accent);font-weight:800}.summary-card{border-left:4px solid var(--accent)}.related-section{display:flex;flex-direction:column;gap:12px}.related-card{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;background:var(--card-bg);border-radius:16px;box-shadow:var(--card-shadow);border:1px solid var(--border)}.related-title{font-weight:700;font-size:.95rem;color:var(--text-primary)}.saved-this-week-card{border-left:4px solid var(--accent)}.quiz-card-badge{padding:6px 14px;border-radius:50px;background:var(--accent-light);color:var(--accent);font-weight:800;font-size:.75rem;letter-spacing:.05em}.review-container{max-width:700px;margin:0 auto}.progress-bar{width:100%;height:6px;background:var(--border);border-radius:10px;overflow:hidden}.progress-fill{height:100%;border-radius:10px;transition:width .4s ease;background:var(--accent)}.progress-teal{background:var(--mint)}.progress-amber{background:var(--amber)}.review-mode-label{font-size:.75rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;margin-bottom:12px}.challenge-options{display:flex;flex-direction:column;gap:12px}.result-card{text-align:center;padding:48px}.result-label{font-size:1.5rem;font-weight:900;margin-bottom:12px}.result-feedback{font-size:1.05rem;line-height:1.6;font-weight:600}.spark-card{min-height:120px;display:flex;align-items:center;justify-content:center;padding:32px}.spark-text{font-size:1.1rem;line-height:1.7;font-weight:600;text-align:center}.spark-dots{display:flex;justify-content:center;gap:8px}.spark-dot{width:8px;height:8px;border-radius:50%;background:var(--border);transition:all .3s ease}.spark-dot.active{background:var(--accent);transform:scale(1.3)}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#f8f7ff,#fff,#f3e8ff);padding:24px}.auth-card{width:100%;max-width:420px;background:#fff;border-radius:32px;box-shadow:0 40px 100px #0000001a,0 0 0 1px #7c3aed0d;padding:48px 40px}.auth-brand{text-align:center;margin-bottom:36px}.auth-toggle{text-align:center}.card-animated{transition:all .4s cubic-bezier(.16,1,.3,1)}.card-animated:hover{transform:translateY(-4px);box-shadow:var(--card-shadow-hover)}.hamburger{display:none;position:fixed;top:16px;left:16px;z-index:200;width:44px;height:44px;border-radius:14px;background:var(--bg-sidebar);border:none;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer;box-shadow:0 8px 24px #5b21b64d}.hamburger span{display:block;width:20px;height:2.5px;background:#fff;border-radius:2px;transition:all .3s ease}.hamburger.open span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}.hamburger.open span:nth-child(2){opacity:0}.hamburger.open span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}.dashboard-notes-column{width:400px;flex-shrink:0}@media (max-width: 768px){.hamburger{display:flex}.sidebar{transform:translate(-100%);transition:transform .3s cubic-bezier(.16,1,.3,1);width:280px;z-index:150}.sidebar.open{transform:translate(0)}.sidebar-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;z-index:140}.sidebar-overlay.show{display:block}.main-content{margin-left:0;padding:72px 16px 24px;max-width:100%}.app-shell{flex-direction:column}.stat-grid{grid-template-columns:1fr!important;gap:16px;margin-bottom:40px}.stat-card{min-height:110px;padding:16px 20px}.stat-value{font-size:32px}.stat-label{font-size:11px}.greeting{font-size:24px;margin-bottom:24px}.modal{max-width:calc(100vw - 32px);padding:32px 24px;border-radius:24px}.library-item-card{flex-direction:column;align-items:flex-start;gap:16px;padding:20px!important}.library-item-card>div:last-child{flex-wrap:wrap;width:100%}.quiz-hub-grid{grid-template-columns:1fr}.notes-editor{font-size:16px;padding:24px;min-height:400px}.auth-card{padding:32px 24px;border-radius:24px}.insights-list li{font-size:.9rem}.saved-this-week-card{width:100%!important;box-sizing:border-box!important;padding:20px 24px!important}.saved-this-week-card>div{gap:12px!important}.saved-this-week-card>div>div:first-child{flex:1;min-width:0}.saved-this-week-card>div>div:first-child>div:first-child{font-size:1rem!important;margin-bottom:8px!important;word-break:break-word;line-height:1.3}.saved-this-week-card>div>div:first-child>div:last-child{gap:10px!important;flex-wrap:wrap}.saved-this-week-card>div>div:last-child{font-size:1.2rem!important;flex-shrink:0;padding-left:4px}.dashboard-notes-column .card{padding:20px 24px!important}.dashboard-notes-column{width:100%}button[title="Keyboard shortcuts (?)"]{display:none}.flex.gap-64{flex-direction:column;gap:32px}}@media (max-width: 480px){.main-content{padding:68px 12px 16px}.stat-grid{grid-template-columns:1fr!important;gap:16px;margin-bottom:32px}.stat-value{font-size:28px}.stat-card{min-height:100px;padding:14px 16px}.greeting{font-size:22px}h1{font-size:1.3rem}.btn{padding:12px 20px;font-size:.85rem;border-radius:12px}.btn-add-content{padding:14px 20px;font-size:1rem;border-radius:14px}.modal{padding:24px 20px}.modal h2{font-size:1.2rem}.challenge-option{padding:16px;font-size:.95rem}.progress-bar{margin-bottom:20px}.search-bar input{font-size:.9rem}.auth-card{padding:28px 20px}.library-item-card .item-title{font-size:1rem}.notes-editor{min-height:300px}.saved-this-week-card{width:100%!important;box-sizing:border-box!important;padding:16px 20px!important;overflow:hidden}.saved-this-week-card>div{flex-wrap:wrap;gap:8px!important}.saved-this-week-card>div>div:first-child>div:first-child{font-size:.9rem!important}.saved-this-week-card>div>div:first-child>div:last-child{gap:8px!important;flex-wrap:wrap}.saved-this-week-card>div>div:last-child{font-size:1rem!important}.dashboard-notes-column .card{padding:16px 20px!important}.dashboard-notes-column{width:100%}.highlight-btn{max-width:90vw;overflow:hidden;text-overflow:ellipsis}}