:root{--bg-dark: #0f172a;--bg-card: rgba(30, 41, 59, .7);--primary: #3b82f6;--primary-hover: #2563eb;--success: #10b981;--success-bg: rgba(16, 185, 129, .1);--error: #ef4444;--error-bg: rgba(239, 68, 68, .1);--text-main: #f8fafc;--text-muted: #94a3b8;--border: rgba(255, 255, 255, .1);--border-focus: rgba(59, 130, 246, .5);font-family:Inter,system-ui,-apple-system,sans-serif;line-height:1.6;font-weight:400;color-scheme:dark;color:var(--text-main);background-color:var(--bg-dark);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box;margin:0;padding:0}body{min-height:100vh;background:radial-gradient(circle at 50% -20%,#1e293b,#0f172a);display:flex;flex-direction:column}#root{display:flex;flex-direction:column;min-height:100vh;width:100%}.glass-card{background:var(--bg-card);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:16px;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f}.glass-panel{background:#0f172a99;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}.navbar{display:flex;align-items:center;justify-content:space-between;padding:1rem 2rem;position:sticky;top:0;z-index:100}.nav-brand{font-size:1.25rem;font-weight:700;display:flex;align-items:center;gap:.5rem;color:#fff;text-decoration:none}.nav-links{display:flex;gap:1.5rem}.nav-link{color:var(--text-muted);text-decoration:none;font-weight:500;transition:color .2s ease,text-shadow .2s ease}.nav-link:hover,.nav-link.active{color:#fff;text-shadow:0 0 12px rgba(255,255,255,.3)}.main-content{flex:1;padding:2rem;max-width:1200px;margin:0 auto;width:100%;display:flex;flex-direction:column;gap:2rem}.hero{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;flex:1;gap:2rem;animation:fadeIn .6s ease-out}.hero h1{font-size:3.5rem;background:linear-gradient(135deg,#60a5fa,#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent;line-height:1.2}.hero p{font-size:1.25rem;color:var(--text-muted);max-width:600px}.action-buttons{display:flex;gap:1rem}.btn{padding:.75rem 1.5rem;border-radius:8px;font-weight:600;font-size:1rem;cursor:pointer;border:none;transition:all .2s ease;display:inline-flex;align-items:center;gap:.5rem;text-decoration:none}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 4px 14px #3b82f663}.btn-primary:hover{background:var(--primary-hover);transform:translateY(-2px);box-shadow:0 6px 20px #3b82f680}.btn-secondary{background:#ffffff1a;color:#fff;border:1px solid var(--border)}.btn-secondary:hover{background:#ffffff26;transform:translateY(-2px)}.quiz-container{display:grid;grid-template-columns:300px 1fr;gap:2rem;align-items:start}.quiz-sidebar{padding:1.5rem;position:sticky;top:5rem;max-height:calc(100vh - 6rem);overflow-y:auto}.quiz-sidebar::-webkit-scrollbar{width:6px}.quiz-sidebar::-webkit-scrollbar-thumb{background:#fff3;border-radius:3px}.question-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:.5rem;margin-top:1rem}.q-badge{width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:8px;background:#ffffff0d;border:1px solid var(--border);color:var(--text-muted);cursor:pointer;font-size:.875rem;font-weight:600;transition:all .2s}.q-badge:hover{background:#ffffff1a;border-color:#ffffff4d}.q-badge.active{border-color:var(--primary);background:#3b82f633;color:#fff}.q-badge.correct{background:var(--success-bg);border-color:var(--success);color:var(--success)}.q-badge.wrong{background:var(--error-bg);border-color:var(--error);color:var(--error)}.quiz-main{padding:2.5rem;display:flex;flex-direction:column;gap:2rem;animation:slideUp .4s ease-out}.question-text{font-size:1.25rem;font-weight:500;color:#fff}.options-list{display:flex;flex-direction:column;gap:1rem}.option-btn{text-align:left;padding:1rem 1.5rem;border-radius:12px;background:#ffffff08;border:1px solid var(--border);color:var(--text-main);cursor:pointer;transition:all .2s;font-size:1rem;display:flex;align-items:center;justify-content:space-between}.option-btn:hover:not(:disabled){background:#ffffff14;border-color:var(--border-focus)}.option-btn.selected{border-color:var(--primary);background:#3b82f61a}.option-btn.correct-ans{border-color:var(--success);background:var(--success-bg)}.option-btn.wrong-ans{border-color:var(--error);background:var(--error-bg)}.option-btn:disabled{cursor:default}.quiz-footer{display:flex;justify-content:space-between;align-items:center;margin-top:1rem;padding-top:1.5rem;border-top:1px solid var(--border)}.feedback-banner{padding:1rem;border-radius:8px;display:flex;align-items:center;gap:.75rem;font-weight:500;animation:fadeIn .3s ease-out}.feedback-banner.correct{background:var(--success-bg);color:var(--success);border:1px solid var(--success)}.feedback-banner.wrong{background:var(--error-bg);color:var(--error);border:1px solid var(--error)}.tutorials-container{display:grid;grid-template-columns:280px 1fr;gap:2rem;align-items:start}.tutorial-list{display:flex;flex-direction:column;gap:.5rem}.tutorial-item{padding:.75rem 1rem;border-radius:8px;cursor:pointer;color:var(--text-muted);transition:all .2s;background:transparent;border:1px solid transparent;text-align:left;font-size:.95rem}.tutorial-item:hover{background:#ffffff0d;color:#fff}.tutorial-item.active{background:#3b82f61a;color:var(--primary);border-color:var(--border-focus)}.markdown-body{padding:2.5rem;color:var(--text-main);line-height:1.7}.markdown-body h1{font-size:2.25rem;margin-bottom:1.5rem;padding-bottom:.5rem;border-bottom:1px solid var(--border);color:#fff}.markdown-body h2{font-size:1.75rem;margin-top:2rem;margin-bottom:1rem;color:#fff}.markdown-body h3{font-size:1.35rem;margin-top:1.5rem;margin-bottom:.75rem;color:#e2e8f0}.markdown-body p{margin-bottom:1.25rem}.markdown-body a{color:var(--primary);text-decoration:none}.markdown-body a:hover{text-decoration:underline}.markdown-body ul,.markdown-body ol{margin-bottom:1.25rem;padding-left:1.5rem}.markdown-body li{margin-bottom:.5rem}.markdown-body code{background:#0000004d;padding:.2em .4em;border-radius:4px;font-family:ui-monospace,SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;font-size:.9em;color:#a78bfa}.markdown-body pre{background:#0006;padding:1.25rem;border-radius:8px;overflow-x:auto;margin-bottom:1.5rem;border:1px solid var(--border)}.markdown-body pre code{background:transparent;padding:0;color:#e2e8f0}.markdown-body blockquote{border-left:4px solid var(--primary);padding-left:1rem;margin-bottom:1.5rem;color:var(--text-muted);background:#3b82f60d;padding:1rem;border-radius:0 8px 8px 0}.markdown-body table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}.markdown-body th,.markdown-body td{border:1px solid var(--border);padding:.75rem;text-align:left}.markdown-body th{background:#ffffff0d;font-weight:600}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 768px){.quiz-container{grid-template-columns:1fr}.quiz-sidebar{position:relative;top:0;max-height:300px}.tutorials-container{grid-template-columns:1fr}}