@import url("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-deep:#faf8f5;--bg-surface:#f2efe9;--bg-card:#fff;--bg-card-hover:#f9f7f3;--bg-input:#fff;--border:#e2d8c8;--border-bright:#c7b59d;--text-primary:#2d3748;--text-secondary:#4a5568;--text-muted:#718096;--accent-1:#2d6a4f;--accent-2:#d97706;--accent-3:#1e40af;--accent-4:#059669;--accent-5:#b45309;--board-bg:#2a4b3c;--board-border:#8b5a2b;--board-text:#f8f9fa;--gradient-main:linear-gradient(135deg,var(--accent-1),var(--accent-4));--gradient-card:linear-gradient(135deg,rgba(45,106,79,.05),rgba(45,106,79,.02));--gradient-glow:radial-gradient(circle at 50% 0%,rgba(45,106,79,.15) 0%,transparent 60%);--shadow-sm:0 2px 8px rgba(0,0,0,.05);--shadow-md:0 8px 32px rgba(0,0,0,.08);--shadow-lg:0 20px 60px rgba(0,0,0,.1);--shadow-glow:0 0 40px rgba(45,106,79,.15);--radius-sm:8px;--radius-md:12px;--radius-lg:20px;--radius-xl:28px;--radius-full:9999px;--font-heading:"Outfit",sans-serif;--font-body:"Inter",sans-serif;--transition:0.2s cubic-bezier(0.4,0,0.2,1);--transition-slow:0.4s cubic-bezier(0.4,0,0.2,1)}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-body);background:var(--bg-deep);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh;overflow-x:hidden}h1,h2,h3,h4,h5{font-family:var(--font-heading);font-weight:700;line-height:1.2;letter-spacing:-.02em}.gradient-text{background:var(--gradient-main);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.glass{background:hsla(0,0%,100%,.7);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm)}.glass,.glass-bright{backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px)}.glass-bright{background:hsla(0,0%,100%,.9);border:1px solid var(--border-bright);border-radius:var(--radius-lg);box-shadow:var(--shadow-md)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;border-radius:var(--radius-full);font-family:var(--font-body);font-size:14px;font-weight:500;cursor:pointer;border:none;transition:all var(--transition);text-decoration:none;white-space:nowrap}.btn-primary{background:var(--gradient-main);color:#fff;box-shadow:0 4px 20px rgba(99,102,241,.4)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(99,102,241,.55)}.btn-primary:active{transform:translateY(0)}.btn-ghost{background:rgba(0,0,0,.03);color:var(--text-secondary);border:1px solid var(--border)}.btn-ghost:hover{background:rgba(0,0,0,.06);color:var(--text-primary);border-color:var(--border-bright)}.btn-outline{background:transparent;color:var(--accent-1);border:1px solid var(--accent-1)}.btn-outline:hover{background:rgba(99,102,241,.12)}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none!important;box-shadow:none!important}.input{width:100%;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-md);padding:12px 16px;font-family:var(--font-body);font-size:14px;color:var(--text-primary);transition:border-color var(--transition),box-shadow var(--transition);outline:none}.input::placeholder{color:var(--text-muted)}.input:focus{border-color:var(--accent-1);box-shadow:0 0 0 3px rgba(99,102,241,.15)}textarea.input{resize:none}.tab-bar{display:flex;gap:6px;padding:4px;background:hsla(0,0%,100%,.04);border-radius:var(--radius-full);border:1px solid var(--border)}.tab{padding:7px 18px;border-radius:var(--radius-full);font-size:13px;font-weight:500;cursor:pointer;border:none;background:transparent;color:var(--text-muted);transition:all var(--transition)}.tab.active{background:var(--gradient-main);color:#fff;box-shadow:0 2px 12px rgba(99,102,241,.4)}.tab:hover:not(.active){color:var(--text-primary);background:hsla(0,0%,100%,.06)}.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:var(--radius-full);font-size:11px;font-weight:600;letter-spacing:.04em;text-transform:uppercase}.badge-beginner{background:rgba(16,185,129,.15);color:#10b981;border:1px solid rgba(16,185,129,.3)}.badge-intermediate{background:rgba(245,158,11,.15);color:#f59e0b;border:1px solid rgba(245,158,11,.3)}.badge-advanced{background:rgba(239,68,68,.15);color:#ef4444;border:1px solid rgba(239,68,68,.3)}.progress-bar{height:4px;background:hsla(0,0%,100%,.06);overflow:hidden}.progress-bar,.progress-fill{border-radius:var(--radius-full)}.progress-fill{height:100%;background:var(--gradient-main);transition:width .5s cubic-bezier(.4,0,.2,1)}::-webkit-scrollbar{width:5px;height:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:rgba(99,102,241,.3);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:rgba(99,102,241,.55)}@keyframes fadeIn{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInLeft{0%{opacity:0;transform:translateX(-12px)}to{opacity:1;transform:translateX(0)}}@keyframes fadeInRight{0%{opacity:0;transform:translateX(12px)}to{opacity:1;transform:translateX(0)}}@keyframes slideDown{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse-glow{0%,to{box-shadow:0 0 20px rgba(99,102,241,.2)}50%{box-shadow:0 0 40px rgba(99,102,241,.5),0 0 80px rgba(139,92,246,.2)}}@keyframes shimmer{0%{background-position:-400px 0}to{background-position:400px 0}}@keyframes bounce{0%,80%,to{transform:translateY(0)}40%{transform:translateY(-6px)}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}@keyframes spin-slow{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}@keyframes gradient-shift{0%{background-position:0 50%}50%{background-position:100% 50%}to{background-position:0 50%}}@keyframes card-flip{0%{transform:rotateY(0deg)}to{transform:rotateY(180deg)}}.anim-fade-in{animation:fadeIn .4s ease forwards}.anim-fade-in-left{animation:fadeInLeft .4s ease forwards}.anim-fade-in-right{animation:fadeInRight .4s ease forwards}.anim-slide-down{animation:slideDown .3s ease forwards}.anim-float{animation:float 4s ease-in-out infinite}.anim-pulse-glow{animation:pulse-glow 2.5s ease-in-out infinite}.typing-dot{width:7px;height:7px;background:var(--accent-1);border-radius:50%;animation:bounce 1.2s infinite}.typing-dot:nth-child(2){animation-delay:.15s}.typing-dot:nth-child(3){animation-delay:.3s}.prose{font-size:14px;line-height:1.75;color:var(--text-primary)}.prose p{margin-bottom:10px}.prose p:last-child{margin-bottom:0}.prose strong{color:#1a202c;font-weight:600}.prose em{color:var(--text-secondary);font-style:italic}.prose ol,.prose ul{padding-left:20px;margin-bottom:10px}.prose li{margin-bottom:4px}.prose h1,.prose h2,.prose h3{font-family:var(--font-heading);font-weight:700;margin:16px 0 8px;color:var(--text-primary)}.prose h1{font-size:18px}.prose h2{font-size:16px}.prose h3{font-size:14px}.prose code{background:rgba(45,106,79,.1);color:#1e40af;padding:2px 6px;border-radius:4px;font-size:12px;font-family:Fira Code,Courier New,monospace}.prose pre{background:#f1f5f9;border:1px solid var(--border);border-radius:var(--radius-md);padding:16px;overflow-x:auto;margin:12px 0}.prose pre code{background:none;padding:0;font-size:13px;color:#334155}.prose blockquote{border-left:3px solid var(--accent-1);padding-left:14px;margin:12px 0;color:var(--text-secondary);font-style:italic}.prose table{width:100%;border-collapse:collapse;margin:12px 0;font-size:13px}.prose td,.prose th{border:1px solid var(--border);padding:8px 12px;text-align:left}.prose th{background:rgba(99,102,241,.1);font-weight:600;color:var(--text-primary)}.prose tr:nth-child(2n){background:hsla(0,0%,100%,.02)}.prose a{color:var(--accent-1);text-decoration:underline}.prose a:hover{color:var(--accent-2)}.prose hr{border:none;border-top:1px solid var(--border);margin:16px 0}.flashcard-scene{perspective:1000px}.flashcard-card{position:relative;width:100%;min-height:180px;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,0,.2,1);cursor:pointer}.flashcard-card.flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--radius-lg);padding:24px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}.flashcard-front{background:var(--gradient-card);border:1px solid var(--border-bright)}.flashcard-back{background:rgba(16,185,129,.08);border:1px solid rgba(16,185,129,.25);transform:rotateY(180deg)}.source-item{background:rgba(99,102,241,.06);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 14px;font-size:12px;color:var(--text-secondary);line-height:1.6;transition:border-color var(--transition)}.source-item:hover{border-color:var(--border-bright)}.concept-chip{display:inline-flex;align-items:center;padding:4px 12px;background:rgba(99,102,241,.12);border:1px solid var(--border-bright);border-radius:var(--radius-full);font-size:12px;color:#a5b4fc;font-weight:500;transition:all var(--transition)}.concept-chip:hover{background:rgba(99,102,241,.22);transform:translateY(-1px)}.quick-action{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;border-radius:var(--radius-full);font-size:12px;font-weight:500;cursor:pointer;border:1px solid var(--border);background:hsla(0,0%,100%,.04);color:var(--text-secondary);transition:all var(--transition);white-space:nowrap}.quick-action:hover{border-color:var(--border-bright);color:var(--text-primary);background:rgba(99,102,241,.1);transform:translateY(-1px)}.quick-action.active{background:rgba(99,102,241,.18);border-color:var(--accent-1);color:#a5b4fc}.level-chip{padding:5px 14px;border-radius:var(--radius-full);font-size:12px;font-weight:500;cursor:pointer;border:1px solid var(--border);background:transparent;color:var(--text-muted);transition:all var(--transition)}.level-chip.selected-beginner{background:rgba(16,185,129,.15);border-color:#10b981;color:#10b981}.level-chip.selected-intermediate{background:rgba(245,158,11,.15);border-color:#f59e0b;color:#f59e0b}.level-chip.selected-advanced{background:rgba(239,68,68,.15);border-color:#ef4444;color:#ef4444}.level-chip:hover:not(.selected-beginner):not(.selected-intermediate):not(.selected-advanced){border-color:var(--border-bright);color:var(--text-primary)}.step-item{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--text-muted);transition:color var(--transition)}.step-item.active{color:var(--text-primary)}.step-item.done{color:var(--accent-5)}.step-dot{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;flex-shrink:0;border:1px solid var(--border);background:var(--bg-card);transition:all var(--transition)}.step-item.active .step-dot{background:var(--gradient-main);border-color:transparent;color:#fff;box-shadow:0 0 16px rgba(99,102,241,.5)}.step-item.done .step-dot{background:rgba(16,185,129,.2);border-color:var(--accent-5);color:var(--accent-5)}.bg-orb{position:fixed;border-radius:50%;filter:blur(80px);pointer-events:none;z-index:0}.bg-orb-1{width:500px;height:500px;background:radial-gradient(circle,rgba(99,102,241,.12),transparent 70%);top:-100px;left:-100px;animation:float 8s ease-in-out infinite}.bg-orb-2{width:400px;height:400px;background:radial-gradient(circle,rgba(139,92,246,.1),transparent 70%);bottom:-80px;right:-80px;animation:float 10s ease-in-out infinite reverse}.bg-orb-3{width:300px;height:300px;background:radial-gradient(circle,rgba(236,72,153,.07),transparent 70%);top:40%;left:60%;animation:float 12s ease-in-out 2s infinite}.skeleton{background:linear-gradient(90deg,hsla(0,0%,100%,.04) 25%,hsla(0,0%,100%,.08) 50%,hsla(0,0%,100%,.04) 75%);background-size:800px 100%;animation:shimmer 1.5s infinite;border-radius:var(--radius-sm)}.drop-zone{border:2px dashed var(--border);border-radius:var(--radius-lg);padding:40px 24px;text-align:center;cursor:pointer;transition:all var(--transition);background:rgba(99,102,241,.03)}.drop-zone.drag-over,.drop-zone:hover{border-color:var(--accent-1);background:rgba(99,102,241,.08);box-shadow:0 0 30px rgba(99,102,241,.1)}.divider{height:1px;background:var(--border);width:100%}.relative,.z-content{position:relative}.z-content{z-index:1}.truncate-2{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.blackboard{background:var(--board-bg);border:12px solid var(--board-border);border-radius:8px;box-shadow:inset 0 0 40px rgba(0,0,0,.5),var(--shadow-lg);padding:30px;color:var(--board-text);font-family:Outfit,sans-serif;position:relative;overflow:hidden}.blackboard:after{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:url("data:image/svg+xml,%3Csvg width='100' height='100' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100' height='100' filter='url(%23noise)' opacity='0.08'/%3E%3C/svg%3E");pointer-events:none;opacity:.4}.chalk-text{font-family:Comic Sans MS,Chalkboard SE,Comic Neue,sans-serif;color:hsla(0,0%,100%,.9);text-shadow:0 0 2px hsla(0,0%,100%,.3);letter-spacing:1px}.chalk-prose h1,.chalk-prose h2,.chalk-prose h3,.chalk-prose li,.chalk-prose p{font-family:Comic Sans MS,Chalkboard SE,Comic Neue,sans-serif;color:hsla(0,0%,100%,.95);text-shadow:0 0 2px hsla(0,0%,100%,.4)}.chalk-prose strong{color:#fff}.chalk-prose pre{background:rgba(0,0,0,.2);border-color:hsla(0,0%,100%,.2)}.chalk-prose code{background:hsla(0,0%,100%,.1);color:#fff}.chalk-prose a{color:#a7f3d0}