.sidebar{width:280px;background:#111;border-right:1px solid #222;position:fixed;height:100vh;display:flex;flex-direction:column;overflow-y:auto;transition:width .3s ease;z-index:100}.sidebar.collapsed{width:60px}.sidebar-header{padding:24px;background:linear-gradient(135deg,#1a1a1a 0%,#2a2a2a 100%);text-align:center;position:relative;border-bottom:1px solid #333}.sidebar.collapsed .sidebar-header{padding:16px 8px}.logo{display:flex;align-items:center;justify-content:center;margin-bottom:8px}.logo-image{width:100%;max-width:200px;height:auto;object-fit:contain;transition:all .3s ease;filter:brightness(1.1)}.sidebar.collapsed .logo-image{max-width:40px}.tagline{font-size:13px;font-weight:500;color:#999;margin:0;background:linear-gradient(135deg,#6366f1,#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.nav-section{flex:1;padding:20px 12px}.chapters-divider{font-size:11px;text-transform:uppercase;letter-spacing:1px;color:#888;margin:20px 8px 12px;font-weight:600;background:linear-gradient(135deg,#ff6b6b,#ffa726);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.nav-item{width:100%;padding:12px 16px;background:transparent;border:1px solid transparent;border-radius:8px;color:#999;display:flex;align-items:center;gap:12px;cursor:pointer;margin-bottom:4px;transition:all .2s ease;text-align:left;font-size:14px;font-weight:500}.nav-item:hover{background:rgba(99,102,241,.1);color:#fff;border-color:#6366f14d;transform:translate(4px)}.nav-item.active{background:linear-gradient(135deg,rgba(99,102,241,.2) 0%,rgba(139,92,246,.2) 100%);border-color:#6366f180;color:#fff;box-shadow:0 2px 8px #6366f14d}.nav-icon{font-size:18px;min-width:18px;text-align:center;transition:transform .2s ease}.nav-item:hover .nav-icon{transform:scale(1.1)}.nav-content{display:flex;flex-direction:column;min-width:0}.nav-title{font-weight:600;font-size:14px;color:inherit;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.nav-description{font-size:11px;color:#666;margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.nav-item.active .nav-description{color:#aaa}.sidebar-footer{padding:20px;border-top:1px solid #333;background:linear-gradient(135deg,#1a1a1a 0%,#0f0f0f 100%)}.progress-indicator{text-align:center}.progress-label{font-size:11px;text-transform:uppercase;letter-spacing:1px;color:#666;font-weight:600;display:block;margin-bottom:8px}.completion-status{font-size:12px;color:#4ade80;font-weight:500;padding:8px 12px;background:rgba(74,222,128,.1);border:1px solid rgba(74,222,128,.3);border-radius:6px}.sidebar::-webkit-scrollbar{width:6px}.sidebar::-webkit-scrollbar-track{background:#1a1a1a}.sidebar::-webkit-scrollbar-thumb{background:#333;border-radius:3px}.sidebar::-webkit-scrollbar-thumb:hover{background:#444}@media (max-width: 768px){.sidebar{width:100%;height:auto;position:relative;border-right:none;border-bottom:1px solid #222}.sidebar.collapsed{width:100%;height:80px}.sidebar.collapsed .nav-section,.sidebar.collapsed .sidebar-footer{display:none}.nav-item{padding:16px}.tagline{font-size:12px}}.video-placeholder{margin:2rem 0}.video-container{position:relative;background:#1a1a1a;border-radius:12px;overflow:hidden;border:1px solid #333;box-shadow:0 4px 12px #0000004d}.video-overlay{position:relative;width:100%;height:200px;background:linear-gradient(135deg,#1a1a1a 0%,#2a2a2a 100%);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .3s ease}.video-overlay:hover{background:linear-gradient(135deg,#2a2a2a 0%,#3a3a3a 100%)}.play-button{width:60px;height:60px;background:rgba(255,255,255,.1);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .3s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2)}.play-button:hover{background:rgba(255,255,255,.2);transform:scale(1.1)}.play-button.playing{background:rgba(255,107,107,.2)}.play-button svg{width:24px;height:24px;color:#fff;margin-left:2px}.play-button.playing svg{margin-left:0}.video-info{padding:1.5rem;background:#151515}.video-title{color:#fff;font-size:1.2rem;font-weight:600;margin:0 0 .5rem}.video-description{color:#aaa;font-size:.9rem;margin:0;line-height:1.5}@media (max-width: 768px){.video-overlay{height:150px}.play-button{width:50px;height:50px}.play-button svg{width:20px;height:20px}.video-info{padding:1rem}.video-title{font-size:1.1rem}.video-description{font-size:.85rem}}.tab-interface{margin:2rem 0;background:#1a1a1a;border-radius:12px;overflow:hidden;border:1px solid #333;box-shadow:0 4px 12px #0000004d}.tab-nav{display:flex;background:#0f0f0f;border-bottom:1px solid #333;overflow-x:auto}.tab-btn{display:flex;align-items:center;gap:.5rem;padding:1rem 1.5rem;background:transparent;border:none;color:#999;cursor:pointer;transition:all .3s ease;border-bottom:3px solid transparent;white-space:nowrap;font-weight:500;min-width:140px;justify-content:center}.tab-btn:hover{background:rgba(255,255,255,.05);color:#fff}.tab-btn.active{background:rgba(99,102,241,.1);color:#fff;border-bottom-color:#6366f1}.tab-content{padding:0}.tab-panel{padding:2rem;min-height:300px;background:#1a1a1a}.tab-nav::-webkit-scrollbar{height:3px}.tab-nav::-webkit-scrollbar-track{background:#0f0f0f}.tab-nav::-webkit-scrollbar-thumb{background:#333;border-radius:2px}.tab-nav::-webkit-scrollbar-thumb:hover{background:#444}@media (max-width: 768px){.tab-btn{min-width:120px;padding:.875rem 1rem}.tab-text{font-size:.8rem}.tab-icon{font-size:1.1rem}.tab-panel{padding:1.5rem}}@media (max-width: 480px){.tab-btn{flex-direction:column;gap:.25rem;min-width:100px;padding:.75rem .5rem}.tab-text{font-size:.75rem}.tab-icon{font-size:1rem}}.project-overview{max-width:1200px;margin:0 auto;padding:0 20px}.overview-layout{display:flex;gap:2rem;align-items:flex-start}.overview-video{width:100%;height:auto;display:block;background:#000}.content-section{flex:1;min-width:0}.tab-content ul{margin:0;padding-left:1.5rem}.tab-content li{color:#ccc;margin-bottom:.5rem;line-height:1.4}.tab-content code{background:rgba(255,255,255,.1);padding:.125rem .25rem;border-radius:3px;font-family:JetBrains Mono,monospace;font-size:.9em;color:#fff}@media (max-width: 768px){.chapter-title{font-size:1.75rem}.overview-layout{flex-direction:column;gap:1.5rem}}.portfolio{max-width:1200px;margin:0 auto;padding:0 20px}.portfolio-layout{display:flex;gap:2rem;align-items:flex-start}.portfolio-video{width:100%;height:auto;display:block;background:#000}.portfolio-info{flex:1;min-width:0;display:flex;align-items:center;justify-content:center}.info-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:2rem;text-align:center;width:100%;max-width:400px}.card-icon{font-size:3rem;margin-bottom:1rem}.info-card h3{color:#fff;font-size:1.25rem;font-weight:600;margin:0 0 1rem}.info-card p{color:#ccc;line-height:1.5;margin-bottom:1.5rem}.portfolio-link{display:inline-flex;align-items:center;gap:.5rem;background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;text-decoration:none;padding:.75rem 1.5rem;border-radius:8px;font-weight:600;transition:all .3s ease}.portfolio-link:hover{background:linear-gradient(135deg,#5b21b6,#7c3aed);transform:translateY(-2px)}@media (max-width: 768px){.chapter-title{font-size:1.75rem}.portfolio-layout{flex-direction:column;gap:1.5rem}.info-card{padding:1.5rem}}.tools{max-width:1200px;margin:0 auto;padding:0 20px}.tools-container{background:#1a1a1a;border-radius:12px;overflow:hidden;border:1px solid #333;box-shadow:0 4px 12px #0000004d}.tools-tab-nav{display:flex;background:#0f0f0f;border-bottom:1px solid #333;overflow-x:auto}.tools-tab-btn{display:flex;align-items:center;gap:.5rem;padding:1.25rem 2rem;background:transparent;border:none;border-bottom:3px solid transparent;color:#999;cursor:pointer;transition:all .3s ease;white-space:nowrap;font-weight:500;min-width:140px;justify-content:center}.tools-tab-btn:hover{background:rgba(255,255,255,.05);color:#fff}.tools-tab-btn.active{background:rgba(34,197,94,.1);color:#fff;border-bottom-color:#22c55e}.tools-content,.tool-content{padding:0}.tool-layout{display:flex;gap:2rem;align-items:flex-start}.video-section{flex:1;min-width:0}.video-wrapper{width:100%;background:#0f0f0f;border-radius:12px;overflow:hidden;box-shadow:0 8px 24px #0006}.tool-video{width:100%;height:auto;display:block;background:#000}.tool-info{flex:1;min-width:0;display:flex;align-items:center;justify-content:center}.tool-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:2rem;width:100%;max-width:400px}.tool-card h3{color:#fff;font-size:1.25rem;font-weight:600;margin:0 0 1rem}.tool-card p{color:#ccc;line-height:1.5;margin-bottom:1rem}.tool-card ul{margin:0 0 1.5rem;padding-left:1.5rem}.tool-card li{color:#ccc;margin-bottom:.5rem;line-height:1.4}.tool-link{display:inline-flex;align-items:center;gap:.5rem;background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;text-decoration:none;padding:.75rem 1.5rem;border-radius:8px;font-weight:600;transition:all .3s ease}.tool-link:hover{background:linear-gradient(135deg,#5b21b6,#7c3aed);transform:translateY(-2px)}.tools-tab-nav::-webkit-scrollbar{height:3px}.tools-tab-nav::-webkit-scrollbar-track{background:#0f0f0f}.tools-tab-nav::-webkit-scrollbar-thumb{background:#333;border-radius:2px}.tools-tab-nav::-webkit-scrollbar-thumb:hover{background:#444}@media (max-width: 768px){.chapter-title{font-size:1.75rem}.tools-tab-btn{min-width:120px;padding:1rem 1.25rem}.tab-text{font-size:.8rem}.tab-icon{font-size:1.1rem}.tool-layout{flex-direction:column;gap:1.5rem}.tool-card{padding:1.5rem}}@media (max-width: 480px){.tools-tab-btn{flex-direction:column;gap:.25rem;min-width:80px;padding:.75rem .5rem}.tab-text{font-size:.75rem}.tab-icon{font-size:1rem}}.netlify{max-width:1400px;margin:0 auto;padding:0 20px}.chapter-header{margin-bottom:2rem}.chapter-title{font-size:2rem;font-weight:600;color:#fff;margin:0}.netlify-container{background:#1a1a1a;border-radius:12px;overflow:hidden;border:1px solid #333;box-shadow:0 4px 12px #0000004d}.netlify-tabs{display:flex;flex-direction:column}.netlify-tab-nav{display:flex;background:#0f0f0f;border-bottom:1px solid #333;overflow-x:auto}.netlify-tab-btn{display:flex;align-items:center;gap:.5rem;padding:1.25rem 2rem;background:transparent;border:none;border-bottom:3px solid transparent;color:#999;cursor:pointer;transition:all .3s ease;white-space:nowrap;font-weight:500;min-width:140px;justify-content:center}.netlify-tab-btn:hover{background:rgba(255,255,255,.05);color:#fff}.netlify-tab-btn.active{background:rgba(34,197,94,.1);color:#fff;border-bottom-color:#22c55e}.tab-icon{font-size:1.2rem}.tab-text{font-size:.9rem;font-weight:600}.netlify-content{padding:0}.netlify-panel{padding:3rem;background:#1a1a1a}.netlify-description{color:#ccc;font-size:1.2rem;line-height:1.6;margin-bottom:3rem;text-align:center;background:rgba(255,255,255,.05);padding:2rem;border-radius:12px;border:1px solid rgba(255,255,255,.1)}.video-wrapper{width:100%;max-width:1000px;margin:0 auto;background:#0f0f0f;border-radius:12px;overflow:hidden;box-shadow:0 8px 24px #0006}.netlify-video{width:100%;height:auto;display:block;background:#000;min-height:300px}.netlify-video::-webkit-media-controls-panel{background-color:#000c}.video-wrapper{position:relative}.netlify-tab-nav::-webkit-scrollbar{height:3px}.netlify-tab-nav::-webkit-scrollbar-track{background:#0f0f0f}.netlify-tab-nav::-webkit-scrollbar-thumb{background:#333;border-radius:2px}.netlify-tab-nav::-webkit-scrollbar-thumb:hover{background:#444}@media (max-width: 768px){.chapter-title{font-size:1.75rem}.netlify-tab-btn{min-width:120px;padding:1rem 1.25rem}.tab-text{font-size:.8rem}.tab-icon{font-size:1.1rem}.netlify-panel{padding:2rem}.netlify-description{padding:1.5rem;font-size:1rem}.video-wrapper{max-width:100%}}@media (max-width: 480px){.netlify-tab-btn{flex-direction:column;gap:.25rem;min-width:80px;padding:.75rem .5rem}.tab-text{font-size:.75rem}.tab-icon{font-size:1rem}}.app{display:flex;min-height:100vh;background:#0a0a0a}.main-content{flex:1;margin-left:280px;padding:40px;max-width:100%;overflow-y:auto;transition:margin-left .3s ease}.main-content.sidebar-collapsed{margin-left:60px}.chapter-container{animation:fadeIn .3s ease-in}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 768px){.app{flex-direction:column}.main-content{margin-left:0;padding:20px}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;background:#0a0a0a;color:#fff;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}code{font-family:JetBrains Mono,Courier New,monospace}button{cursor:pointer;font-family:inherit}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:#1a1a1a}::-webkit-scrollbar-thumb{background:#333;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#444}