@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap";
:root{--bg-base:#0d0e14;--bg-surface:#13151f;--bg-elevated:#1a1d2e;--bg-hover:#23273a;--bg-active:#2a2f45;--border-subtle:#ffffff0f;--border-default:#ffffff1a;--border-strong:#ffffff2e;--accent-primary:#7c6af7;--accent-secondary:#56cfea;--accent-glow:#7c6af740;--accent-gradient:linear-gradient(135deg, #7c6af7 0%, #56cfea 100%);--text-primary:#e8ecf4;--text-secondary:#8b92a9;--text-muted:#555d74;--text-accent:#7c6af7;--green:#3dd68c;--yellow:#f5c542;--red:#f56565;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;--shadow-sm:0 1px 3px #0006;--shadow-md:0 4px 16px #00000080;--shadow-glow:0 0 32px #7c6af733;--transition-fast:.12s ease;--transition-med:.25s ease;--transition-slow:.4s ease}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html,body{background:var(--bg-base);height:100%;color:var(--text-primary);-webkit-font-smoothing:antialiased;font-family:Inter,system-ui,sans-serif;font-size:15px;line-height:1.6;overflow:hidden}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-default);border-radius:99px}::-webkit-scrollbar-thumb:hover{background:var(--border-strong)}h1,h2,h3,h4{color:var(--text-primary);font-weight:600;line-height:1.3}code,pre{font-family:JetBrains Mono,monospace;font-size:.875em}pre{background:var(--bg-base);border:1px solid var(--border-subtle);border-radius:var(--radius-md);margin:1rem 0;padding:1.25rem 1.5rem;overflow-x:auto}code:not(pre code){color:var(--accent-secondary);background:#7c6af71f;border-radius:4px;padding:1px 6px}a{color:var(--accent-primary);text-decoration:none}a:hover{text-decoration:underline}.gradient-text{background:var(--accent-gradient);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.glass{-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border:1px solid var(--border-subtle);background:#1a1d2eb3}.badge{letter-spacing:.04em;text-transform:uppercase;border-radius:99px;align-items:center;gap:5px;padding:3px 10px;font-size:11px;font-weight:600;display:inline-flex}.badge-purple{color:var(--accent-primary);background:#7c6af726;border:1px solid #7c6af740}.badge-cyan{color:var(--accent-secondary);background:#56cfea1f;border:1px solid #56cfea33}.badge-green{color:var(--green);background:#3dd68c1f;border:1px solid #3dd68c33}@keyframes fadeUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes shimmer{0%{background-position:-200%}to{background-position:200%}}@keyframes pulse-dot{0%,to{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.8)}}@keyframes spin{to{transform:rotate(360deg)}}.animate-fadeUp{animation:fadeUp var(--transition-slow) both}.animate-spin{animation:1s linear infinite spin}.lesson-layout{background:var(--bg-base);width:100vw;height:100vh;display:flex;overflow:hidden}.topbar{z-index:100;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--border-subtle);background:#0d0e14d9;align-items:center;gap:16px;height:52px;padding:0 20px;display:flex;position:fixed;top:0;left:0;right:0}.topbar-logo{letter-spacing:-.02em;white-space:nowrap;align-items:center;gap:8px;font-size:15px;font-weight:700;display:flex}.topbar-logo .logo-icon{border-radius:var(--radius-sm);background:var(--accent-gradient);width:28px;height:28px;box-shadow:var(--shadow-glow);justify-content:center;align-items:center;font-size:14px;display:flex}.topbar-sep{flex:1}.panels-container{width:100%;height:100vh;padding-top:52px;display:flex;overflow:hidden}.panel-lesson{background:var(--bg-surface);flex-direction:column;min-width:280px;height:100%;display:flex;overflow:hidden}.panel-resize-handle{background:var(--border-subtle);cursor:col-resize;width:4px;height:100%;transition:background var(--transition-fast);flex-shrink:0;position:relative}.panel-resize-handle:after{content:"";background:var(--border-strong);width:2px;height:40px;transition:background var(--transition-fast), height var(--transition-fast);border-radius:99px;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.panel-resize-handle:hover,.panel-resize-handle.dragging{background:#7c6af74d}.panel-resize-handle:hover:after,.panel-resize-handle.dragging:after{background:var(--accent-primary);height:80px}.panel-code-server{background:var(--bg-base);flex-direction:column;flex:1;min-width:300px;display:flex;overflow:hidden}.lesson-header{border-bottom:1px solid var(--border-subtle);flex-shrink:0;padding:20px 24px 16px}.lesson-title{margin-bottom:8px;font-size:17px;font-weight:700;line-height:1.3}.lesson-meta{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.lesson-progress-bar-wrap{border-bottom:1px solid var(--border-subtle);flex-shrink:0;padding:12px 24px}.lesson-progress-label{color:var(--text-muted);letter-spacing:.05em;text-transform:uppercase;justify-content:space-between;margin-bottom:6px;font-size:11px;font-weight:600;display:flex}.progress-bar-track{background:var(--border-subtle);border-radius:99px;height:3px;overflow:hidden}.progress-bar-fill{background:var(--accent-gradient);border-radius:99px;height:100%;transition:width .5s cubic-bezier(.4,0,.2,1);box-shadow:0 0 8px #7c6af780}.lesson-steps-nav{border-bottom:1px solid var(--border-subtle);flex-direction:column;flex-shrink:0;gap:2px;max-height:200px;padding:12px 16px;display:flex;overflow-y:auto}.step-item{border-radius:var(--radius-sm);cursor:pointer;transition:background var(--transition-fast);color:var(--text-secondary);align-items:center;gap:10px;padding:8px 10px;font-size:13px;display:flex}.step-item:hover{background:var(--bg-hover)}.step-item.active{color:var(--text-primary);background:#7c6af71f}.step-item.completed{color:var(--text-muted)}.step-dot{border:2px solid var(--border-default);width:20px;height:20px;transition:all var(--transition-fast);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:10px;display:flex}.step-item.active .step-dot{border-color:var(--accent-primary);color:var(--accent-primary);background:#7c6af726}.step-item.completed .step-dot{border-color:var(--green);color:var(--green);background:#3dd68c1a}.lesson-content{flex:1;padding:24px;overflow-y:auto}.mdx-content{animation:.35s both fadeUp}.mdx-content h1{margin-bottom:12px;font-size:22px}.mdx-content h2{color:var(--text-primary);margin:20px 0 10px;font-size:18px}.mdx-content h3{color:var(--accent-secondary);margin:16px 0 8px;font-size:15px}.mdx-content p{color:var(--text-secondary);margin-bottom:12px;line-height:1.7}.mdx-content ul,.mdx-content ol{margin:8px 0 14px 20px}.mdx-content li{color:var(--text-secondary);margin-bottom:6px}.mdx-content blockquote{border-left:3px solid var(--accent-primary);border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--text-secondary);background:#7c6af70f;margin:12px 0;padding:8px 16px;font-style:italic}.mdx-content table{border-collapse:collapse;width:100%;margin:12px 0;font-size:13px}.mdx-content th{background:var(--bg-elevated);color:var(--text-primary);text-align:left;border-bottom:2px solid var(--border-default);padding:8px 12px;font-weight:600}.mdx-content td{color:var(--text-secondary);border-bottom:1px solid var(--border-subtle);padding:8px 12px}.mdx-content tr:last-child td{border-bottom:none}.lesson-footer{border-top:1px solid var(--border-subtle);background:var(--bg-surface);flex-shrink:0;justify-content:space-between;align-items:center;padding:14px 20px;display:flex}.btn{border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);border:none;align-items:center;gap:6px;padding:8px 16px;font-family:inherit;font-size:13px;font-weight:600;display:inline-flex}.btn:disabled{opacity:.3;cursor:not-allowed}.btn-ghost{color:var(--text-secondary);border:1px solid var(--border-default);background:0 0}.btn-ghost:hover:not(:disabled){background:var(--bg-hover);color:var(--text-primary)}.btn-primary{background:var(--accent-gradient);color:#fff;box-shadow:0 2px 12px #7c6af759}.btn-primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 4px 20px #7c6af773}.btn-primary:active:not(:disabled){transform:translateY(0)}.code-server-header{background:var(--bg-elevated);border-bottom:1px solid var(--border-subtle);flex-shrink:0;align-items:center;gap:10px;height:36px;padding:0 16px;display:flex}.status-dot{background:var(--green);width:8px;height:8px;box-shadow:0 0 6px var(--green);border-radius:50%;animation:2s infinite pulse-dot}.status-dot.offline{background:var(--yellow);box-shadow:0 0 6px var(--yellow)}.code-server-url{color:var(--text-muted);text-overflow:ellipsis;white-space:nowrap;flex:1;font-family:JetBrains Mono,monospace;font-size:11px;overflow:hidden}.code-server-iframe{background:#1e1e2e;border:none;flex:1;width:100%;display:block}.code-server-placeholder{text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:16px;padding:40px;display:flex}.placeholder-icon{border-radius:var(--radius-lg);background:var(--accent-gradient);width:64px;height:64px;box-shadow:var(--shadow-glow);justify-content:center;align-items:center;margin-bottom:8px;font-size:28px;display:flex}.catalog-page{background:var(--bg-base);min-height:100vh;padding-top:52px}.catalog-hero{text-align:center;padding:80px 40px 60px;position:relative;overflow:hidden}.catalog-hero:before{content:"";pointer-events:none;background:radial-gradient(80% 60% at 50% 0,#7c6af72e 0%,#0000 70%);position:absolute;inset:0}.catalog-hero h1{letter-spacing:-.03em;margin-bottom:16px;font-size:clamp(36px,6vw,64px);font-weight:800}.catalog-hero p{color:var(--text-secondary);max-width:560px;margin:0 auto;font-size:18px}.catalog-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;max-width:1200px;margin:0 auto;padding:0 40px 80px;display:grid}.lesson-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-med);padding:24px;text-decoration:none;display:block;position:relative;overflow:hidden}.lesson-card:before{content:"";background:var(--accent-gradient);opacity:0;transition:opacity var(--transition-med);pointer-events:none;position:absolute;inset:0}.lesson-card:hover{box-shadow:0 12px 40px #0006, var(--shadow-glow);border-color:#7c6af766;transform:translateY(-3px)}.lesson-card:hover:before{opacity:.04}.lesson-card-icon{border-radius:var(--radius-md);background:var(--bg-elevated);border:1px solid var(--border-subtle);justify-content:center;align-items:center;width:48px;height:48px;margin-bottom:16px;font-size:22px;display:flex}.lesson-card h3{color:var(--text-primary);margin-bottom:8px;font-size:16px;font-weight:700}.lesson-card-desc{color:var(--text-secondary);margin-bottom:16px;font-size:13px;line-height:1.6}.lesson-card-footer{border-top:1px solid var(--border-subtle);justify-content:space-between;align-items:center;padding-top:14px;display:flex}.lesson-duration{color:var(--text-muted);align-items:center;gap:4px;font-size:12px;display:flex}.hint-box{border-radius:var(--radius-md);color:var(--text-secondary);background:#7c6af714;border:1px solid #7c6af733;gap:10px;margin:14px 0;padding:12px 14px;font-size:13px;display:flex}.hint-box .hint-icon{flex-shrink:0;font-size:15px}.skeleton{background:linear-gradient(90deg, var(--bg-elevated) 25%, var(--bg-hover) 50%, var(--bg-elevated) 75%);border-radius:var(--radius-sm);background-size:200%;animation:1.5s linear infinite shimmer}.landing-page{background:var(--bg-base);height:100vh;overflow-y:auto}.landing-nav{z-index:100;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--border-subtle);background:#0d0e14d9;justify-content:space-between;align-items:center;height:52px;padding:0 40px;display:flex;position:fixed;top:0;left:0;right:0}.landing-nav-logo{letter-spacing:-.02em;color:var(--text-primary);align-items:center;gap:8px;font-size:15px;font-weight:700;text-decoration:none;display:flex}.landing-nav-logo .logo-icon{border-radius:var(--radius-sm);background:var(--accent-gradient);width:28px;height:28px;box-shadow:var(--shadow-glow);justify-content:center;align-items:center;font-size:14px;display:flex}.landing-hero{text-align:center;max-width:800px;margin:0 auto;padding:140px 40px 80px;position:relative;overflow:hidden}.landing-hero:before{content:"";pointer-events:none;background:radial-gradient(80% 60% at 50% 0,#7c6af72e 0%,#0000 70%);position:absolute;inset:0}.landing-hero h1{letter-spacing:-.03em;margin-bottom:20px;font-size:clamp(40px,6vw,68px);font-weight:800;line-height:1.1}.landing-hero>p{color:var(--text-secondary);max-width:560px;margin:0 auto 32px;font-size:18px;line-height:1.7}.landing-ctas{flex-wrap:wrap;justify-content:center;gap:16px;display:flex}.landing-features{max-width:1100px;margin:0 auto;padding:80px 40px}.landing-features h2{text-align:center;margin-bottom:48px;font-size:clamp(24px,4vw,36px);font-weight:700}.landing-features-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;display:grid}.landing-feature-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);transition:all var(--transition-med);padding:32px}.landing-feature-card:hover{box-shadow:0 12px 40px #0006, var(--shadow-glow);border-color:#7c6af766;transform:translateY(-3px)}.landing-feature-icon{border-radius:var(--radius-md);background:var(--accent-gradient);width:48px;height:48px;box-shadow:var(--shadow-glow);justify-content:center;align-items:center;margin-bottom:20px;font-size:22px;display:flex}.landing-feature-card h3{margin-bottom:8px;font-size:17px;font-weight:700}.landing-feature-card p{color:var(--text-secondary);font-size:14px;line-height:1.7}.landing-lessons-preview{max-width:1100px;margin:0 auto;padding:40px 40px 80px}.landing-lessons-preview h2{text-align:center;margin-bottom:48px;font-size:clamp(24px,4vw,36px);font-weight:700}.landing-preview-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;margin-bottom:32px;display:grid}.landing-view-all{text-align:center;color:var(--accent-primary);font-size:14px;font-weight:600;display:block}.landing-view-all:hover{color:var(--accent-secondary)}.landing-cta{text-align:center;border-top:1px solid var(--border-subtle);padding:60px 40px 100px}.landing-cta h2{margin-bottom:16px;font-size:clamp(24px,4vw,36px);font-weight:700}.landing-cta p{color:var(--text-secondary);margin-bottom:32px;font-size:16px}@media (max-width:768px){.landing-hero{padding:120px 24px 60px}.landing-features{padding:60px 24px}.landing-lessons-preview{padding:40px 24px 60px}.landing-cta{padding:40px 24px 80px}.landing-nav{padding:0 20px}}