@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";
:root{--bg-primary:#090d16;--bg-secondary:#101524;--bg-tertiary:#1b2035;--glass-bg:#ffffff08;--glass-bg-hover:#ffffff0f;--glass-bg-active:#ffffff1a;--glass-border:#ffffff0f;--glass-border-hover:#ffffff1f;--glass-blur:16px;--glass-blur-heavy:24px;--primary:#2563eb;--primary-hover:#3b82f6;--primary-glow:#2563eb33;--primary-soft:#2563eb14;--secondary:#60a5fa;--secondary-hover:#93c5fd;--secondary-glow:#60a5fa33;--secondary-soft:#60a5fa14;--accent:#94a3b8;--accent-hover:#cbd5e1;--accent-glow:#94a3b826;--accent-soft:#94a3b814;--success:#22c55e;--success-soft:#22c55e26;--warning:#fbbf24;--warning-soft:#fbbf2426;--error:#ef4444;--error-soft:#ef444426;--info:#3b82f6;--info-soft:#3b82f626;--text-primary:#e8e8f0;--text-secondary:#8b8ba3;--text-muted:#5a5a72;--text-inverse:#0a0a1a;--font-family:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-xs:.75rem;--font-sm:.875rem;--font-base:1rem;--font-lg:1.125rem;--font-xl:1.25rem;--font-2xl:1.5rem;--font-3xl:1.875rem;--font-4xl:2.25rem;--font-5xl:3rem;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--space-16:4rem;--space-20:5rem;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--shadow-sm:0 2px 8px #0000004d;--shadow-md:0 4px 16px #0006;--shadow-lg:0 8px 32px #00000080;--shadow-glow-primary:0 0 20px var(--primary-glow);--shadow-glow-secondary:0 0 20px var(--secondary-glow);--shadow-glow-accent:0 0 20px var(--accent-glow);--transition-fast:.15s ease;--transition-base:.25s ease;--transition-slow:.4s ease;--sidebar-width:260px;--sidebar-collapsed-width:72px;--header-height:64px;--content-max-width:1200px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;scroll-behavior:smooth;font-size:16px}body{font-family:var(--font-family);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6;overflow-x:hidden}a{color:var(--primary);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--primary-hover)}button{font-family:var(--font-family);cursor:pointer;background:0 0;border:none;outline:none}input,textarea,select{font-family:var(--font-family);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-md);color:var(--text-primary);padding:var(--space-3) var(--space-4);font-size:var(--font-base);transition:border-color var(--transition-fast), box-shadow var(--transition-fast);outline:none;width:100%}input:focus,textarea:focus,select:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}input::placeholder,textarea::placeholder{color:var(--text-muted)}ul,ol{list-style:none}img{max-width:100%;display:block}.animated-bg{z-index:0;pointer-events:none;width:100%;height:100%;position:fixed;top:0;left:0;overflow:hidden}.gradient-orb{filter:blur(80px);opacity:.4;border-radius:50%;animation:20s ease-in-out infinite float;position:absolute}.gradient-orb:first-child{background:radial-gradient(circle, var(--primary) 0%, transparent 70%);width:500px;height:500px;animation-duration:25s;animation-delay:0s;top:-10%;right:-5%}.gradient-orb:nth-child(2){background:radial-gradient(circle, var(--secondary) 0%, transparent 70%);width:400px;height:400px;animation-duration:20s;animation-delay:-5s;bottom:-10%;left:-5%}.gradient-orb:nth-child(3){background:radial-gradient(circle, var(--accent) 0%, transparent 70%);width:350px;height:350px;animation-duration:30s;animation-delay:-10s;top:50%;left:40%}.glass{background:var(--glass-bg);-webkit-backdrop-filter:blur(var(--glass-blur));border:1px solid var(--glass-border);border-radius:var(--radius-lg);transition:all var(--transition-base)}.glass:hover{background:var(--glass-bg-hover);border-color:var(--glass-border-hover)}.glass-static{background:var(--glass-bg);-webkit-backdrop-filter:blur(var(--glass-blur));border:1px solid var(--glass-border);border-radius:var(--radius-lg)}.btn{justify-content:center;align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-5);border-radius:var(--radius-md);font-size:var(--font-sm);transition:all var(--transition-base);white-space:nowrap;font-weight:600;display:inline-flex;position:relative;overflow:hidden}.btn-primary{background:var(--primary);color:#fff;box-shadow:var(--shadow-glow-primary)}.btn-primary:hover{background:var(--primary-hover);box-shadow:0 0 30px var(--primary-glow);transform:translateY(-1px)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--secondary);color:var(--text-inverse);box-shadow:var(--shadow-glow-secondary)}.btn-secondary:hover{background:var(--secondary-hover);transform:translateY(-1px)}.btn-ghost{background:var(--glass-bg);color:var(--text-primary);border:1px solid var(--glass-border)}.btn-ghost:hover{background:var(--glass-bg-hover);border-color:var(--glass-border-hover)}.btn-danger{background:var(--error);color:#fff}.btn-danger:hover{background:#dc2626;transform:translateY(-1px)}.btn-sm{padding:var(--space-2) var(--space-3);font-size:var(--font-xs)}.btn-lg{padding:var(--space-4) var(--space-8);font-size:var(--font-base)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.btn .spinner{width:16px;height:16px}.badge{padding:var(--space-1) var(--space-3);border-radius:var(--radius-full);font-size:var(--font-xs);letter-spacing:.02em;align-items:center;font-weight:600;display:inline-flex}.badge-primary{background:var(--primary-soft);color:var(--primary)}.badge-secondary{background:var(--secondary-soft);color:var(--secondary)}.badge-accent{background:var(--accent-soft);color:var(--accent)}.badge-success{background:var(--success-soft);color:var(--success)}.badge-warning{background:var(--warning-soft);color:var(--warning)}.badge-error{background:var(--error-soft);color:var(--error)}.heading-1{font-size:var(--font-5xl);letter-spacing:-.03em;font-weight:800;line-height:1.1}.heading-2{font-size:var(--font-4xl);letter-spacing:-.02em;font-weight:700;line-height:1.2}.heading-3{font-size:var(--font-2xl);letter-spacing:-.01em;font-weight:600;line-height:1.3}.heading-4{font-size:var(--font-xl);font-weight:600;line-height:1.4}.text-gradient{background:linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.text-secondary{color:var(--text-secondary)}.text-muted{color:var(--text-muted)}.progress-bar{background:var(--glass-bg);border-radius:var(--radius-full);width:100%;height:8px;overflow:hidden}.progress-bar-fill{background:linear-gradient(90deg, var(--primary), var(--secondary));border-radius:var(--radius-full);height:100%;transition:width var(--transition-slow)}.spinner{border:3px solid var(--glass-border);border-top-color:var(--primary);border-radius:50%;width:24px;height:24px;animation:.8s linear infinite spin}.spinner-sm{border-width:2px;width:16px;height:16px}.spinner-lg{border-width:4px;width:40px;height:40px}.modal-overlay{-webkit-backdrop-filter:blur(8px);z-index:1000;animation:fadeIn var(--transition-base) ease;padding:var(--space-4);background:#0009;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal-content{background:var(--bg-secondary);border:1px solid var(--glass-border);border-radius:var(--radius-xl);width:100%;max-width:560px;max-height:85vh;animation:slideUp var(--transition-base) ease;box-shadow:var(--shadow-lg);overflow-y:auto}.modal-header{padding:var(--space-6);border-bottom:1px solid var(--glass-border);justify-content:space-between;align-items:center;display:flex}.modal-body{padding:var(--space-6)}.modal-footer{justify-content:flex-end;gap:var(--space-3);padding:var(--space-6);border-top:1px solid var(--glass-border);display:flex}.toast-container{top:var(--space-4);right:var(--space-4);z-index:10000;gap:var(--space-3);flex-direction:column;max-width:380px;display:flex;position:fixed}.toast{background:var(--bg-secondary);border:1px solid var(--glass-border);border-radius:var(--radius-md);padding:var(--space-4);box-shadow:var(--shadow-lg);animation:slideInRight var(--transition-base) ease;align-items:flex-start;gap:var(--space-3);display:flex}.toast-success{border-left:3px solid var(--success)}.toast-error{border-left:3px solid var(--error)}.toast-warning{border-left:3px solid var(--warning)}.toast-info{border-left:3px solid var(--info)}.toast-progress{background:var(--primary);border-radius:0 0 var(--radius-md) var(--radius-md);height:3px;animation:linear forwards shrink;position:absolute;bottom:0;left:0}.app-shell{min-height:100vh;display:flex;position:relative}.sidebar{width:var(--sidebar-width);background:var(--sidebar-bg,#0a0a1ad9);height:100vh;-webkit-backdrop-filter:blur(var(--glass-blur-heavy));border-right:1px solid var(--glass-border);z-index:100;transition:width var(--transition-base), transform var(--transition-base);flex-direction:column;display:flex;position:fixed;top:0;left:0;overflow:hidden}.sidebar.collapsed{width:var(--sidebar-collapsed-width)}.sidebar.collapsed .sidebar-logo{padding:var(--space-4) var(--space-2);justify-content:center}.sidebar.collapsed .sidebar-logo-text,.sidebar.collapsed .sidebar-section-title{display:none}.sidebar.collapsed .nav-item{padding:var(--space-3);justify-content:center}.sidebar.collapsed .nav-item span{display:none}.sidebar.collapsed .nav-item .nav-icon{margin:0}.main-content{margin-left:var(--sidebar-width);z-index:1;min-height:100vh;transition:margin-left var(--transition-base);flex:1;position:relative}.page-header{z-index:50;height:var(--header-height);background:var(--header-bg,#0a0a1acc);-webkit-backdrop-filter:blur(var(--glass-blur));border-bottom:1px solid var(--glass-border);padding:0 var(--space-8);justify-content:space-between;align-items:center;display:flex;position:sticky;top:0}.page-content{padding:var(--space-8);max-width:var(--content-max-width);margin:0 auto}.sidebar-logo{align-items:center;gap:var(--space-3);padding:var(--space-6);border-bottom:1px solid var(--glass-border);display:flex}.sidebar-logo-icon{border-radius:var(--radius-md);background:linear-gradient(135deg, var(--primary), var(--secondary));width:40px;height:40px;font-size:var(--font-xl);flex-shrink:0;justify-content:center;align-items:center;display:flex}.sidebar-logo-text{font-size:var(--font-lg);letter-spacing:-.02em;font-weight:700}.sidebar-nav{padding:var(--space-4);gap:var(--space-1);flex-direction:column;flex:1;display:flex;overflow-y:auto}.sidebar-section-title{padding:var(--space-3) var(--space-3);font-size:var(--font-xs);text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);margin-top:var(--space-4);font-weight:600}.sidebar-section-title:first-child{margin-top:0}.nav-item{align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-3);border-radius:var(--radius-md);color:var(--text-secondary);font-size:var(--font-sm);transition:all var(--transition-fast);cursor:pointer;font-weight:500;text-decoration:none;display:flex}.nav-item:hover{background:var(--glass-bg-hover);color:var(--text-primary)}.nav-item.active{background:var(--primary-soft);color:var(--primary);box-shadow:inset 0 0 20px var(--primary-glow)}.nav-item .nav-icon{flex-shrink:0;width:20px;height:20px}.sidebar-footer{padding:var(--space-4);border-top:1px solid var(--glass-border)}.upload-zone{border:2px dashed var(--glass-border);border-radius:var(--radius-xl);padding:var(--space-12);text-align:center;cursor:pointer;transition:all var(--transition-base);position:relative;overflow:hidden}.upload-zone:hover,.upload-zone.drag-over{border-color:var(--primary);background:var(--primary-soft)}.upload-zone.drag-over:after{content:"";background:var(--primary-soft);animation:1.5s infinite pulse;position:absolute;inset:0}.chat-container{height:calc(100vh - var(--header-height) - var(--space-16));flex-direction:column;max-height:800px;display:flex}.chat-messages{padding:var(--space-6);gap:var(--space-4);flex-direction:column;flex:1;display:flex;overflow-y:auto}.chat-message{gap:var(--space-3);max-width:80%;animation:fadeSlideUp var(--transition-base) ease;display:flex}.chat-message.user{flex-direction:row-reverse;align-self:flex-end}.chat-message-avatar{border-radius:var(--radius-full);width:36px;height:36px;font-size:var(--font-sm);flex-shrink:0;justify-content:center;align-items:center;font-weight:600;display:flex}.chat-message.user .chat-message-avatar{background:var(--primary-soft);color:var(--primary)}.chat-message.assistant .chat-message-avatar{background:var(--secondary-soft);color:var(--secondary)}.chat-message-bubble{padding:var(--space-4);border-radius:var(--radius-lg);font-size:var(--font-sm);line-height:1.6}.chat-message.user .chat-message-bubble{background:var(--primary);color:#fff;border-bottom-right-radius:var(--radius-sm)}.chat-message.assistant .chat-message-bubble{background:var(--glass-bg);border:1px solid var(--glass-border);border-bottom-left-radius:var(--radius-sm)}.chat-input-area{padding:var(--space-4) var(--space-6);border-top:1px solid var(--glass-border);gap:var(--space-3);align-items:flex-end;display:flex}.chat-input-area textarea{resize:none;border-radius:var(--radius-lg);min-height:44px;max-height:120px;padding:var(--space-3) var(--space-4);flex:1}.flashcard-container{perspective:1000px;cursor:pointer}.flashcard{width:100%;height:280px;transform-style:preserve-3d;transition:transform .6s;position:relative}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-face{backface-visibility:hidden;padding:var(--space-8);border-radius:var(--radius-xl);text-align:center;flex-direction:column;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.flashcard-front{background:var(--glass-bg);border:1px solid var(--glass-border)}.flashcard-back{background:var(--primary-soft);border:1px solid var(--primary);transform:rotateY(180deg)}.stat-card{padding:var(--space-6);gap:var(--space-2);flex-direction:column;display:flex}.stat-card-value{font-size:var(--font-4xl);letter-spacing:-.02em;font-weight:800}.stat-card-label{font-size:var(--font-sm);color:var(--text-secondary)}.stat-card-trend{font-size:var(--font-xs);align-items:center;gap:var(--space-1);font-weight:600;display:flex}.stat-card-trend.up{color:var(--success)}.stat-card-trend.down{color:var(--error)}.grid-2{gap:var(--space-6);grid-template-columns:repeat(2,1fr);display:grid}.grid-3{gap:var(--space-6);grid-template-columns:repeat(3,1fr);display:grid}.grid-4{gap:var(--space-6);grid-template-columns:repeat(4,1fr);display:grid}.grid-auto{gap:var(--space-6);grid-template-columns:repeat(auto-fill,minmax(300px,1fr));display:grid}.quiz-option{align-items:center;gap:var(--space-3);padding:var(--space-4);border-radius:var(--radius-md);border:1px solid var(--glass-border);background:var(--glass-bg);cursor:pointer;transition:all var(--transition-fast);display:flex}.quiz-option:hover{border-color:var(--primary);background:var(--primary-soft)}.quiz-option.selected{border-color:var(--primary);background:var(--primary-soft);box-shadow:0 0 10px var(--primary-glow)}.quiz-option.correct{border-color:var(--success);background:var(--success-soft)}.quiz-option.incorrect{border-color:var(--error);background:var(--error-soft)}.quiz-option-letter{border-radius:var(--radius-full);width:32px;height:32px;font-weight:700;font-size:var(--font-sm);background:var(--glass-bg);border:1px solid var(--glass-border);flex-shrink:0;justify-content:center;align-items:center;display:flex}.heatmap-row{gap:3px;display:flex}.heatmap-cell{background:var(--glass-bg);width:14px;height:14px;transition:all var(--transition-fast);border-radius:3px}.heatmap-cell.level-1{background:#7c5cfc33}.heatmap-cell.level-2{background:#7c5cfc66}.heatmap-cell.level-3{background:#7c5cfc99}.heatmap-cell.level-4{background:var(--primary)}.empty-state{padding:var(--space-16);text-align:center;justify-content:center;align-items:center;gap:var(--space-4);flex-direction:column;display:flex}.empty-state-icon{border-radius:var(--radius-xl);background:var(--glass-bg);width:80px;height:80px;font-size:var(--font-4xl);justify-content:center;align-items:center;display:flex}.markdown-content h1,.markdown-content h2,.markdown-content h3{margin-top:var(--space-4);margin-bottom:var(--space-2)}.markdown-content h1{font-size:var(--font-2xl);font-weight:700}.markdown-content h2{font-size:var(--font-xl);font-weight:600}.markdown-content h3{font-size:var(--font-lg);font-weight:600}.markdown-content p{margin-bottom:var(--space-3)}.markdown-content ul,.markdown-content ol{margin-bottom:var(--space-3);padding-left:var(--space-6)}.markdown-content ul{list-style:outside}.markdown-content ol{list-style:decimal}.markdown-content li{margin-bottom:var(--space-1)}.markdown-content code{background:var(--glass-bg-active);border-radius:var(--radius-sm);padding:2px 6px;font-family:Fira Code,monospace;font-size:.9em}.markdown-content pre{background:var(--bg-primary);border:1px solid var(--glass-border);border-radius:var(--radius-md);padding:var(--space-4);margin-bottom:var(--space-3);overflow-x:auto}.markdown-content pre code{background:0 0;padding:0}.markdown-content blockquote{border-left:3px solid var(--primary);padding-left:var(--space-4);color:var(--text-secondary);margin-bottom:var(--space-3)}.markdown-content strong{color:var(--text-primary);font-weight:600}.markdown-content table{border-collapse:collapse;width:100%;margin-bottom:var(--space-3)}.markdown-content th,.markdown-content td{padding:var(--space-2) var(--space-3);border:1px solid var(--glass-border);text-align:left}.markdown-content th{background:var(--glass-bg);font-weight:600}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--glass-border);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes fadeSlideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}@keyframes slideInRight{0%{opacity:0;transform:translate(100%)}to{opacity:1;transform:translate(0)}}@keyframes slideInLeft{0%{opacity:0;transform:translate(-20px)}to{opacity:1;transform:translate(0)}}@keyframes float{0%,to{transform:translate(0)rotate(0)}25%{transform:translate(30px,-40px)rotate(5deg)}50%{transform:translate(-20px,20px)rotate(-5deg)}75%{transform:translate(15px,30px)rotate(3deg)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes pulse{0%,to{opacity:.4}50%{opacity:.8}}@keyframes shrink{0%{width:100%}to{width:0%}}@keyframes countUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}.skeleton{background:linear-gradient(90deg, var(--glass-bg) 25%, var(--glass-bg-hover) 50%, var(--glass-bg) 75%);border-radius:var(--radius-md);background-size:200% 100%;animation:1.5s infinite shimmer}@media (max-width:1024px){.grid-4,.grid-3{grid-template-columns:repeat(2,1fr)}}@media (max-width:768px){:root{--sidebar-width:0px}.sidebar{width:280px;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.main-content{margin-left:0}.page-content{padding:var(--space-4)}.page-header{padding:0 var(--space-4)}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.chat-message{max-width:95%}.heading-1{font-size:var(--font-3xl)}.heading-2{font-size:var(--font-2xl)}.modal-content{margin:var(--space-4)}}.sidebar-overlay{z-index:99;background:#00000080;display:none;position:fixed;inset:0}@media 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