:root{--bg-primary: #ffffff;--bg-secondary: #f8fafc;--bg-tertiary: #f1f5f9;--bg-card: #ffffff;--bg-card-hover: #f8fafc;--accent-cyan: #0284c7;--accent-emerald: #059669;--accent-amber: #d97706;--accent-purple: #7e22ce;--accent-rose: #e11d48;--gradient-primary: linear-gradient(135deg, #0284c7 0%, #4f46e5 100%);--gradient-gold: linear-gradient(135deg, #d97706 0%, #b45309 100%);--gradient-emerald: linear-gradient(135deg, #059669 0%, #047857 100%);--gradient-purple: linear-gradient(135deg, #7e22ce 0%, #6b21a8 100%);--text-primary: #0f172a;--text-secondary: #334155;--text-muted: #64748b;--border-color: #e2e8f0;--border-glow: rgba(2, 132, 199, .25);--font-main: "Inter", system-ui, -apple-system, sans-serif;--font-heading: "Outfit", sans-serif;--font-mono: "Fira Code", monospace;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px;--shadow-sm: 0 4px 12px rgba(15, 23, 42, .06);--shadow-md: 0 8px 24px rgba(15, 23, 42, .1);--shadow-glow: 0 0 20px rgba(2, 132, 199, .12);--sidebar-width: 320px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-main);background-color:var(--bg-primary);color:var(--text-primary);line-height:1.65;overflow-x:hidden;-webkit-font-smoothing:antialiased}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);letter-spacing:-.02em;font-weight:700;color:var(--text-primary)}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#94a3b8}code,pre{font-family:var(--font-mono)}pre{background:#0f172a;padding:1.25rem;border-radius:var(--radius-md);border:1px solid #334155;overflow-x:auto;font-size:.9rem;line-height:1.5;color:#f8fafc}code:not(pre code){background:#f1f5f9;color:var(--accent-cyan);padding:.2rem .45rem;border-radius:4px;font-size:.88em;border:1px solid #e2e8f0}.glass-panel{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:all .3s cubic-bezier(.4,0,.2,1)}.glass-panel:hover{box-shadow:var(--shadow-md);border-color:#cbd5e1}.btn-primary{background:var(--gradient-primary);color:#fff;border:none;padding:.6rem 1.4rem;border-radius:var(--radius-md);font-weight:600;font-family:var(--font-heading);cursor:pointer;display:inline-flex;align-items:center;gap:.5rem;transition:transform .2s,box-shadow .2s;box-shadow:0 4px 14px #0284c74d}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px #0284c773}.btn-secondary{background:#f1f5f9;color:var(--text-primary);border:1px solid var(--border-color);padding:.6rem 1.2rem;border-radius:var(--radius-md);font-weight:500;cursor:pointer;display:inline-flex;align-items:center;gap:.5rem;transition:all .2s}.btn-secondary:hover{background:#e2e8f0;border-color:#cbd5e1}.badge{display:inline-flex;align-items:center;gap:.35rem;padding:.25rem .75rem;border-radius:9999px;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em}.badge-cyan{background:#e0f2fe;color:#0369a1;border:1px solid #bae6fd}.badge-amber{background:#fef3c7;color:#b45309;border:1px solid #fde68a}.badge-emerald{background:#d1fae5;color:#047857;border:1px solid #a7f3d0}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:fadeIn .4s cubic-bezier(.16,1,.3,1) forwards}.mermaid-box{background:#f8fafc;border:1px solid #e2e8f0;border-radius:var(--radius-md);padding:1.5rem;margin:1.5rem 0;display:flex;justify-content:center;align-items:center;overflow-x:auto;box-shadow:var(--shadow-sm)}.mermaid-box svg{max-width:100%!important;height:auto!important}.interactive-widget{background:#fff;border:1px solid #bae6fd;border-radius:var(--radius-lg);padding:1.5rem;margin:2rem 0;box-shadow:0 4px 16px #0284c714}.quiz-card{background:#f8fafc;border:1px solid #e2e8f0;border-radius:var(--radius-md);padding:1.25rem;margin-top:1rem}.quiz-option{display:flex;align-items:center;padding:.75rem 1rem;margin-top:.5rem;background:#fff;border:1px solid #e2e8f0;border-radius:var(--radius-sm);cursor:pointer;transition:all .2s;color:#334155}.quiz-option:hover{background:#e0f2fe;border-color:#0284c7}.quiz-option.selected-correct{background:#d1fae5;border-color:#059669;color:#047857}.quiz-option.selected-incorrect{background:#ffe4e6;border-color:#e11d48;color:#9f1239}.app-container{display:flex;min-height:100vh;width:100%;background-color:#fff}.content-wrapper{flex:1;display:flex;flex-direction:column;margin-left:320px;min-width:0;transition:margin-left .3s ease;background-color:#fff}.main-content{flex:1;padding:2.5rem 3rem;max-width:1100px;width:100%}.mobile-toggle-btn{display:none!important}.sidebar-overlay{display:none}@media (max-width: 1024px){.content-wrapper{margin-left:0!important}.main-content{padding:1.25rem 1rem}.mobile-toggle-btn{display:inline-flex!important}.sidebar-overlay.active{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:45}.sidebar-drawer{transform:translate(-100%)}.sidebar-drawer.open{transform:translate(0)!important}}