@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";:root{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #334155;--bg-card: rgba(30, 41, 59, .8);--bg-glass: rgba(30, 41, 59, .6);--accent: #3b82f6;--accent-light: #60a5fa;--accent-dark: #2563eb;--accent-glow: rgba(59, 130, 246, .5);--success: #22c55e;--success-light: #4ade80;--warning: #f59e0b;--warning-light: #fbbf24;--error: #ef4444;--error-light: #f87171;--text-primary: #f8fafc;--text-secondary: #94a3b8;--text-muted: #64748b;--gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);--gradient-success: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);--gradient-gold: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .5);--shadow-glow: 0 0 20px var(--accent-glow);--border-color: rgba(148, 163, 184, .2);--border-radius-sm: 8px;--border-radius-md: 12px;--border-radius-lg: 16px;--border-radius-xl: 24px;--border-radius-full: 9999px;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-2xl: 48px;--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 2rem;--font-size-4xl: 2.5rem;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700;--line-height-tight: 1.25;--line-height-normal: 1.5;--line-height-relaxed: 1.75;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .35s ease;--z-dropdown: 100;--z-modal: 200;--z-toast: 300}[data-theme=light]{--bg-primary: #f8fafc;--bg-secondary: #e2e8f0;--bg-tertiary: #cbd5e1;--bg-card: rgba(255, 255, 255, .9);--bg-glass: rgba(255, 255, 255, .7);--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #64748b;--border-color: rgba(100, 116, 139, .2);--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .1);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .15)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-lg);font-size:var(--font-size-base);font-weight:var(--font-weight-medium);border:none;border-radius:var(--border-radius-md);cursor:pointer;transition:all var(--transition-fast);text-decoration:none;white-space:nowrap}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:var(--shadow-md)}.btn-primary:hover:not(:disabled){box-shadow:var(--shadow-glow);transform:translateY(-2px)}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary)}.btn-secondary:hover:not(:disabled){background:var(--bg-secondary)}.btn-success{background:var(--gradient-success);color:#fff}.btn-warning{background:var(--gradient-gold);color:#fff}.btn-danger{background:var(--error);color:#fff}.btn-danger:hover:not(:disabled){background:var(--error-light)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover:not(:disabled){background:var(--bg-tertiary);color:var(--text-primary)}.btn-outline{background:transparent;border:2px solid var(--accent);color:var(--accent)}.btn-outline:hover:not(:disabled){background:var(--accent);color:#fff}.btn-sm{padding:var(--spacing-xs) var(--spacing-md);font-size:var(--font-size-sm)}.btn-lg{padding:var(--spacing-md) var(--spacing-xl);font-size:var(--font-size-lg)}.btn-icon{width:40px;height:40px;padding:0;border-radius:var(--border-radius-full)}.btn-icon.btn-sm{width:32px;height:32px}.btn-icon.btn-lg{width:48px;height:48px}.card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--border-radius-lg);padding:var(--spacing-lg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:all var(--transition-normal)}.card-hover:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--accent)}.card-glow{box-shadow:var(--shadow-glow);border-color:var(--accent)}.card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--spacing-md)}.card-title{font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold);color:var(--text-primary)}.card-body{color:var(--text-secondary)}.card-footer{margin-top:var(--spacing-md);padding-top:var(--spacing-md);border-top:1px solid var(--border-color)}.glass-card{background:var(--bg-glass);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.1);border-radius:var(--border-radius-xl);padding:var(--spacing-xl)}.input-group{display:flex;flex-direction:column;gap:var(--spacing-xs)}.input-label{font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:var(--text-secondary)}.input{width:100%;padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-base);color:var(--text-primary);background:var(--bg-tertiary);border:2px solid transparent;border-radius:var(--border-radius-md);transition:all var(--transition-fast)}.input::placeholder{color:var(--text-muted)}.input:focus{outline:none;border-color:var(--accent);background:var(--bg-secondary)}.input-error{border-color:var(--error)}.input-success{border-color:var(--success)}.error-message{font-size:var(--font-size-sm);color:var(--error)}.textarea{min-height:100px;resize:vertical}.select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;background-size:16px;padding-right:40px}.badge{display:inline-flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-xs) var(--spacing-sm);font-size:var(--font-size-xs);font-weight:var(--font-weight-medium);border-radius:var(--border-radius-full);text-transform:uppercase;letter-spacing:.5px}.badge-primary{background:#3b82f633;color:var(--accent-light)}.badge-success{background:#22c55e33;color:var(--success-light)}.badge-warning{background:#f59e0b33;color:var(--warning-light)}.badge-error{background:#ef444433;color:var(--error-light)}.badge-gold{background:var(--gradient-gold);color:#fff}.avatar{width:40px;height:40px;border-radius:var(--border-radius-full);background:var(--gradient-primary);display:flex;align-items:center;justify-content:center;font-weight:var(--font-weight-bold);color:#fff;font-size:var(--font-size-sm);text-transform:uppercase}.avatar-sm{width:32px;height:32px;font-size:var(--font-size-xs)}.avatar-lg{width:56px;height:56px;font-size:var(--font-size-lg)}.avatar-xl{width:80px;height:80px;font-size:var(--font-size-2xl)}.progress{height:8px;background:var(--bg-tertiary);border-radius:var(--border-radius-full);overflow:hidden}.progress-bar{height:100%;background:var(--gradient-primary);border-radius:var(--border-radius-full);transition:width var(--transition-slow)}.progress-success .progress-bar{background:var(--gradient-success)}.progress-warning .progress-bar{background:var(--gradient-gold)}.stat-card{display:flex;flex-direction:column;gap:var(--spacing-xs);padding:var(--spacing-lg);background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--border-radius-lg)}.stat-value{font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.stat-label{font-size:var(--font-size-sm);color:var(--text-secondary)}.streak-badge{display:inline-flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);background:var(--gradient-gold);border-radius:var(--border-radius-full);color:#fff;font-weight:var(--font-weight-bold)}.streak-badge .streak-icon{font-size:var(--font-size-lg)}.xp-container{display:flex;flex-direction:column;gap:var(--spacing-xs)}.xp-header{display:flex;justify-content:space-between;align-items:center}.xp-level{font-weight:var(--font-weight-bold);color:var(--accent)}.xp-progress{font-size:var(--font-size-sm);color:var(--text-secondary)}.modal-overlay{position:fixed;inset:0;background:#000000b3;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:var(--z-modal);padding:var(--spacing-md);animation:fadeIn var(--transition-fast)}.modal{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--border-radius-xl);max-width:500px;width:100%;max-height:90vh;overflow-y:auto;animation:scaleIn var(--transition-normal)}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-lg);border-bottom:1px solid var(--border-color)}.modal-title{font-size:var(--font-size-xl);font-weight:var(--font-weight-bold)}.modal-close{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:transparent;border:none;color:var(--text-secondary);cursor:pointer;border-radius:var(--border-radius-full);transition:all var(--transition-fast)}.modal-close:hover{background:var(--bg-tertiary);color:var(--text-primary)}.modal-body{padding:var(--spacing-lg)}.modal-footer{display:flex;justify-content:flex-end;gap:var(--spacing-sm);padding:var(--spacing-lg);border-top:1px solid var(--border-color)}.toast-container{position:fixed;bottom:var(--spacing-lg);right:var(--spacing-lg);z-index:var(--z-toast);display:flex;flex-direction:column;gap:var(--spacing-sm)}.toast{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md) var(--spacing-lg);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--border-radius-md);box-shadow:var(--shadow-lg);animation:slideUp var(--transition-normal);min-width:300px}.toast-success{border-left:4px solid var(--success)}.toast-error{border-left:4px solid var(--error)}.toast-warning{border-left:4px solid var(--warning)}.toast-info{border-left:4px solid var(--accent)}.tabs{display:flex;gap:var(--spacing-xs);border-bottom:1px solid var(--border-color);margin-bottom:var(--spacing-lg)}.tab{padding:var(--spacing-sm) var(--spacing-md);font-weight:var(--font-weight-medium);color:var(--text-secondary);background:transparent;border:none;border-bottom:2px solid transparent;cursor:pointer;transition:all var(--transition-fast)}.tab:hover{color:var(--text-primary)}.tab.active{color:var(--accent);border-bottom-color:var(--accent)}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-2xl);text-align:center}.empty-state-icon{font-size:64px;margin-bottom:var(--spacing-md);opacity:.5}.empty-state-title{font-size:var(--font-size-xl);font-weight:var(--font-weight-semibold);margin-bottom:var(--spacing-sm)}.empty-state-text{color:var(--text-secondary);max-width:400px}.loader{width:40px;height:40px;border:3px solid var(--bg-tertiary);border-top-color:var(--accent);border-radius:50%;animation:spin 1s linear infinite}.loader-sm{width:24px;height:24px;border-width:2px}.loader-lg{width:56px;height:56px;border-width:4px}.skeleton{background:linear-gradient(90deg,var(--bg-tertiary) 25%,var(--bg-secondary) 50%,var(--bg-tertiary) 75%);background-size:200% 100%;animation:skeleton-loading 1.5s infinite;border-radius:var(--border-radius-sm)}@keyframes skeleton-loading{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton-text{height:16px;margin-bottom:var(--spacing-sm)}.skeleton-title{height:24px;width:60%;margin-bottom:var(--spacing-md)}.skeleton-avatar{width:40px;height:40px;border-radius:var(--border-radius-full)}.dropdown{position:relative}.dropdown-menu{position:absolute;top:100%;right:0;min-width:180px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--border-radius-md);box-shadow:var(--shadow-lg);z-index:var(--z-dropdown);padding:var(--spacing-xs);animation:slideDown var(--transition-fast)}.dropdown-item{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);color:var(--text-secondary);border-radius:var(--border-radius-sm);cursor:pointer;transition:all var(--transition-fast)}.dropdown-item:hover{background:var(--bg-tertiary);color:var(--text-primary)}.dropdown-divider{height:1px;background:var(--border-color);margin:var(--spacing-xs) 0}.navbar{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md) var(--spacing-lg);background:var(--bg-glass);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--border-color);position:sticky;top:0;z-index:var(--z-dropdown)}.navbar-brand{display:flex;align-items:center;gap:var(--spacing-sm);font-size:var(--font-size-xl);font-weight:var(--font-weight-bold);color:var(--text-primary)}.navbar-nav{display:flex;align-items:center;gap:var(--spacing-md);list-style:none;padding:0;margin:0}.nav-link{display:flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-sm) var(--spacing-md);color:var(--text-secondary);font-weight:var(--font-weight-medium);border-radius:var(--border-radius-md);transition:all var(--transition-fast)}.nav-link:hover{color:var(--text-primary);background:var(--bg-tertiary)}.nav-link.active{color:var(--accent);background:#3b82f61a}.bottom-nav{display:none;position:fixed;bottom:0;left:0;right:0;background:var(--bg-glass);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-top:1px solid var(--border-color);padding:var(--spacing-sm) var(--spacing-md);z-index:var(--z-dropdown)}.bottom-nav-items{display:flex;justify-content:space-around;list-style:none;padding:0;margin:0}.bottom-nav-item{display:flex;flex-direction:column;align-items:center;gap:2px;padding:var(--spacing-xs);color:var(--text-secondary);font-size:var(--font-size-xs);transition:all var(--transition-fast);text-decoration:none}.bottom-nav-item:hover,.bottom-nav-item.active{color:var(--accent)}.bottom-nav-item .icon{font-size:20px}@media(max-width:1024px){.navbar-nav{display:none}.bottom-nav{display:block}.main-content{padding-bottom:80px}}.table-container{overflow-x:auto;border-radius:var(--border-radius-lg);border:1px solid var(--border-color)}.table{width:100%;border-collapse:collapse}.table th,.table td{padding:var(--spacing-md);text-align:left;border-bottom:1px solid var(--border-color)}.table th{background:var(--bg-tertiary);font-weight:var(--font-weight-semibold);color:var(--text-secondary);font-size:var(--font-size-sm);text-transform:uppercase;letter-spacing:.5px}.table tr:hover{background:var(--bg-secondary)}.table tr:last-child td{border-bottom:none}.flashcard-container{perspective:1000px;width:100%;max-width:400px;height:300px;margin:0 auto}.flashcard{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,0,.2,1);cursor:pointer}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;width:100%;height:100%;backface-visibility:hidden;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-xl);background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--border-radius-xl);text-align:center}.flashcard-front{background:var(--gradient-primary);color:#fff}.flashcard-back{transform:rotateY(180deg);background:var(--bg-secondary)}.flashcard-word{font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);margin-bottom:var(--spacing-md)}.flashcard-hint{font-size:var(--font-size-sm);opacity:.8}.quiz-option{display:block;width:100%;padding:var(--spacing-md) var(--spacing-lg);background:var(--bg-card);border:2px solid var(--border-color);border-radius:var(--border-radius-md);color:var(--text-primary);text-align:left;cursor:pointer;transition:all var(--transition-fast);margin-bottom:var(--spacing-sm)}.quiz-option:hover:not(.selected):not(.correct):not(.incorrect){border-color:var(--accent);background:#3b82f61a}.quiz-option.selected{border-color:var(--accent);background:#3b82f633}.quiz-option.correct{border-color:var(--success);background:#22c55e33}.quiz-option.incorrect{border-color:var(--error);background:#ef444433}.quiz-explanation{padding:var(--spacing-md);background:#3b82f61a;border-left:4px solid var(--accent);border-radius:0 var(--border-radius-md) var(--border-radius-md) 0;margin-top:var(--spacing-md)}.leaderboard-item{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--border-radius-md);margin-bottom:var(--spacing-sm);transition:all var(--transition-fast)}.leaderboard-item:hover{border-color:var(--accent)}.leaderboard-item.top-1{background:linear-gradient(135deg,#ffd7001a,#ffc1070d);border-color:gold}.leaderboard-item.top-2{background:linear-gradient(135deg,#c0c0c01a,#a9a9a90d);border-color:silver}.leaderboard-item.top-3{background:linear-gradient(135deg,#cd7f321a,#b873330d);border-color:#cd7f32}.leaderboard-rank{width:32px;height:32px;display:flex;align-items:center;justify-content:center;font-weight:var(--font-weight-bold);border-radius:var(--border-radius-full);background:var(--bg-tertiary)}.leaderboard-item.top-1 .leaderboard-rank{background:linear-gradient(135deg,gold,#ffb700);color:#1a1a1a}.leaderboard-item.top-2 .leaderboard-rank{background:linear-gradient(135deg,silver,#a9a9a9);color:#1a1a1a}.leaderboard-item.top-3 .leaderboard-rank{background:linear-gradient(135deg,#cd7f32,#b8733a);color:#fff}.leaderboard-info{flex:1}.leaderboard-name{font-weight:var(--font-weight-semibold)}.leaderboard-stats{font-size:var(--font-size-sm);color:var(--text-secondary)}.leaderboard-xp{font-weight:var(--font-weight-bold);color:var(--accent)}.sidebar{width:260px;height:100vh;background:var(--bg-secondary);border-right:1px solid var(--border-color);display:flex;flex-direction:column;position:fixed;left:0;top:0}.sidebar-header{padding:var(--spacing-lg);border-bottom:1px solid var(--border-color)}.sidebar-nav{flex:1;padding:var(--spacing-md);overflow-y:auto}.sidebar-link{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);color:var(--text-secondary);border-radius:var(--border-radius-md);margin-bottom:var(--spacing-xs);transition:all var(--transition-fast)}.sidebar-link:hover{background:var(--bg-tertiary);color:var(--text-primary)}.sidebar-link.active{background:#3b82f61a;color:var(--accent)}.sidebar-section-title{font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;padding:var(--spacing-md) var(--spacing-md) var(--spacing-sm)}.content-with-sidebar{margin-left:260px;min-height:100vh;padding:var(--spacing-xl);padding-top:var(--spacing-lg)}@media(max-width:1024px){.sidebar{transform:translate(-100%);z-index:var(--z-modal);transition:transform var(--transition-normal)}.sidebar.open{transform:translate(0)}.content-with-sidebar{margin-left:0;padding:var(--spacing-md)}}.assignments-section{background:var(--bg-secondary);border-radius:var(--border-radius-lg);padding:var(--spacing-lg);margin-bottom:var(--spacing-xl);border:1px solid var(--border-color)}.assignments-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:var(--spacing-md);margin-top:var(--spacing-md)}.assignment-card{display:flex;align-items:center;gap:var(--spacing-md);background:var(--bg-primary);padding:var(--spacing-md);border-radius:var(--border-radius-md);border:1px solid var(--border-color);transition:all var(--transition-fast);text-decoration:none}.assignment-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--accent)}.assignment-icon{font-size:1.5rem;width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:var(--bg-tertiary);border-radius:var(--border-radius-full)}.assignment-info{flex:1}.assignment-info h4{font-size:var(--font-size-base);margin:0 0 4px;color:var(--text-primary);font-weight:var(--font-weight-semibold)}.assignment-info p{font-size:var(--font-size-sm);color:var(--text-secondary);margin:0}.assignment-arrow{color:var(--text-muted);font-size:1.2rem;transition:transform var(--transition-fast)}.assignment-card:hover .assignment-arrow{transform:translate(4px);color:var(--accent)}.empty-assignments{text-align:center;padding:var(--spacing-xl) 0;color:var(--text-secondary)}.empty-icon{font-size:3rem;margin-bottom:var(--spacing-sm);opacity:.5;display:block}.type-lesson .assignment-icon{color:var(--accent);background:var(--bg-tertiary)}.type-flashcard .assignment-icon{color:var(--success);background:var(--bg-tertiary)}.type-quiz .assignment-icon{color:var(--warning);background:var(--bg-tertiary)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-family);font-size:var(--font-size-base);line-height:var(--line-height-normal);color:var(--text-primary);background:var(--bg-primary);min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4,h5,h6{font-weight:var(--font-weight-bold);line-height:var(--line-height-tight);color:var(--text-primary)}h1{font-size:var(--font-size-4xl)}h2{font-size:var(--font-size-3xl)}h3{font-size:var(--font-size-2xl)}h4{font-size:var(--font-size-xl)}h5{font-size:var(--font-size-lg)}h6{font-size:var(--font-size-base)}p{color:var(--text-secondary);margin-bottom:var(--spacing-md)}a{color:var(--accent);text-decoration:none;transition:color 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