@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&display=swap";:root{--primary: #1D3557;--primary-dark: #14263F;--primary-light: #2D4A73;--primary-50: #EDF2F7;--primary-100: #DCE5F0;--primary-200: #C4D2E4;--primary-500: #1D3557;--primary-600: #14263F;--primary-700: #0F1D33;--primary-800: #0B1729;--primary-900: #081220;--primary-950: #060D18;--accent: #0F766E;--accent-dark: #115E59;--accent-light: #14B8A6;--accent-50: #ECFEFF;--accent-100: #CCFBF1;--accent-200: #99F6E4;--success: #10B981;--success-50: #ECFDF5;--success-light: #D1FAE5;--success-dark: #059669;--warning: #F59E0B;--warning-light: #FEF3C7;--warning-dark: #D97706;--error: #EF4444;--error-light: #FEE2E2;--error-dark: #DC2626;--info: #3B82F6;--info-light: #DBEAFE;--gray-50: #F9FAFB;--gray-100: #F3F4F6;--gray-200: #E5E7EB;--gray-300: #D1D5DB;--gray-400: #9CA3AF;--gray-500: #6B7280;--gray-600: #4B5563;--gray-700: #374151;--gray-800: #1F2937;--gray-900: #111827;--gray-950: #030712;--background: #F5F7FA;--foreground: #0D1117;--card-bg: #FFFFFF;--input-bg: #FFFFFF;--border: #E8ECF2;--border-subtle: #F0F3F8;--surface-1: #FFFFFF;--surface-2: #F5F7FA;--surface-3: #EDF0F5;--text-primary: #0D1117;--text-secondary: #4A5568;--text-muted: #718096;--ring: var(--primary);--ring-rgb: 29, 53, 87;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow: 0 1px 3px 0 rgb(0 0 0 / .1), 0 1px 2px -1px rgb(0 0 0 / .1);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1);--radius-sm: .375rem;--radius: .5rem;--radius-md: .75rem;--radius-lg: 1rem;--radius-xl: 1.5rem;--radius-full: 9999px}[data-theme=dark]{--background: #0C1018;--foreground: #EDF2F7;--card-bg: #141C26;--input-bg: #111820;--border: #1E2A3A;--border-subtle: #192230;--surface-1: #141C26;--surface-2: #111820;--surface-3: #1A2332;--text-primary: #F3F7FF;--text-secondary: #C7D2E5;--text-muted: #94A3B8;--ring-rgb: 20, 184, 166;--gray-50: #10151D;--gray-100: #1A2230;--gray-200: #273142;--gray-300: #3A4860;--gray-400: #64748B;--gray-500: #94A3B8;--gray-600: #C7D2E5;--gray-700: #DBE5F5;--gray-800: #E8F0FC;--gray-900: #F3F7FF;--gray-950: #FFFFFF;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .3);--shadow: 0 1px 3px 0 rgb(0 0 0 / .4), 0 1px 2px -1px rgb(0 0 0 / .3);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .4), 0 2px 4px -2px rgb(0 0 0 / .3);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .4), 0 4px 6px -4px rgb(0 0 0 / .3);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .5), 0 8px 10px -6px rgb(0 0 0 / .4);--success-light: #064E3B;--success-50: rgba(16, 185, 129, .14);--warning-light: #78350F;--error-light: #7F1D1D;--info-light: #1E3A5F;--primary-50: #0F1726;--primary-100: #172338;--primary-200: #22344E;--accent-50: #0D2422;--accent-100: #123432;--accent-200: #1FA89A}[data-theme=dark] 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.chat-history-item{color:var(--gray-600)}[data-theme=dark] .chat-history-item:hover{background:var(--gray-100)}[data-theme=dark] .quiz-header h2,[data-theme=dark] .quiz-question-text{color:var(--foreground)}[data-theme=dark] .quiz-option{color:var(--foreground);border-color:var(--border)}[data-theme=dark] .quiz-explanation,[data-theme=dark] .quiz-explanation strong{color:var(--foreground)}[data-theme=dark] .quiz-explanation p{color:var(--gray-600)}[data-theme=dark] .quiz-nav-sidebar{background:#0e172a;border-color:var(--border)}[data-theme=dark] .quiz-nav-sidebar h4{color:var(--foreground)}[data-theme=dark] .codelab-toolbar{background:#1e2130!important;border-color:#2d3348!important}[data-theme=dark] .codelab-lang-btn{background:#131620;border-color:#3d4460;color:#d1d5db}[data-theme=dark] .codelab-lang-dropdown{background:#1e2130;border-color:#3d4460}[data-theme=dark] .codelab-lang-dropdown button{color:#d1d5db}[data-theme=dark] .codelab-lang-dropdown button:hover,[data-theme=dark] .codelab-lang-dropdown button.active{background:#2d3348}[data-theme=dark] .codelab-toolbar-actions .btn{color:#d1d5db}[data-theme=dark] .codelab-toolbar-actions .btn:hover{color:#fff;background:#2d3348}[data-theme=dark] .codelab-editor{background:#0f1117!important}[data-theme=dark] .codelab-line-numbers{color:#6b7280;border-color:#2d3348}[data-theme=dark] .codelab-output{background:#131620!important;border-color:#2d3348!important}[data-theme=dark] .codelab-output-header{color:#9ca3af;border-color:#2d3348}[data-theme=dark] .codelab-problem,[data-theme=dark] .codelab-problem-header{border-color:var(--border)}[data-theme=dark] .codelab-problem-header h2{color:var(--foreground)}[data-theme=dark] .codelab-problem-body{color:var(--gray-600)}[data-theme=dark] .codelab-problem-body h4{color:var(--foreground)}[data-theme=dark] .codelab-testcase{background:var(--gray-100);border-color:var(--border);color:var(--foreground)}[data-theme=dark] .progress-header h1,[data-theme=dark] .progress-stat-val,[data-theme=dark] .progress-mastery-pct,[data-theme=dark] .progress-section h3,[data-theme=dark] .progress-activity-title,[data-theme=dark] .progress-mastery-name,[data-theme=dark] .notes-header h1,[data-theme=dark] .note-card-title,[data-theme=dark] .videos-header h1,[data-theme=dark] .video-card-body h3,[data-theme=dark] .settings-header h1,[data-theme=dark] .settings-panel h2,[data-theme=dark] .settings-field label{color:var(--foreground)}[data-theme=dark] .settings-field input,[data-theme=dark] .settings-field textarea{background:var(--input-bg);border-color:var(--border);color:var(--foreground)}[data-theme=dark] .courses-page h1,[data-theme=dark] .course-card h3,[data-theme=dark] .course-detail-header h1{color:var(--foreground)}[data-theme=dark] .course-detail-tabs .tab{color:var(--gray-500)}[data-theme=dark] .course-detail-tabs .tab.active{color:var(--primary)}[data-theme=dark] .dash-stat-card,[data-theme=dark] .dash-section,[data-theme=dark] 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0}.divider{display:flex;align-items:center;gap:1rem;color:var(--gray-400);font-size:.875rem}.divider:before,.divider:after{content:"";flex:1;height:1px;background:var(--gray-200)}.toggle{position:relative;width:3rem;height:1.5rem;background:var(--gray-300);border-radius:var(--radius-full);cursor:pointer;transition:background .3s;border:none;padding:0}.toggle.active{background:var(--accent)}.app-content>*{animation:pageEnter .18s ease-out both}@keyframes pageEnter{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}[data-theme=dark] ::-webkit-scrollbar-track{background:var(--surface-2)}[data-theme=dark] ::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}[data-theme=dark] ::-webkit-scrollbar-thumb:hover{background:var(--gray-300)}.btn:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.input:focus-visible,select:focus-visible{outline:2px solid var(--accent);outline-offset:2px}a:focus-visible{outline:2px solid 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