*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--bg-deep:#050505;--bg-primary:#0b0b0b;--bg-surface:#141414;--bg-elevated:#1c1c1c;--bg-hover:#252525;--accent:#e50914;--accent-bright:#ff2d2d;--accent-warm:#ff6b35;--accent-glow:rgba(229,9,20,.35);--green:#2ecc71;--green-dim:#1a7a42;--text-primary:#e8e8e8;--text-secondary:#999;--text-muted:#555;--font-display:"Bebas Neue",Impact,sans-serif;--font-body:"DM Sans",system-ui,sans-serif;--font-mono:"JetBrains Mono",monospace;--sidebar-w:300px;--navbar-h:56px;--radius:8px;--radius-lg:12px;--ease-out:cubic-bezier(.16,1,.3,1);--ease-bounce:cubic-bezier(.34,1.56,.64,1)}html{scroll-behavior:smooth}body{font-family:var(--font-body);background:var(--bg-deep);color:var(--text-primary);overflow-x:hidden;min-height:100vh}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#2a2a2a;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#444}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}.top-bar{position:fixed;top:0;left:0;right:0;height:3px;z-index:1000;background:transparent}.top-bar-fill{height:100%;width:0%;background:linear-gradient(90deg,var(--accent),var(--accent-warm));transition:width .3s ease;border-radius:0 2px 2px 0}.navbar{position:fixed;top:3px;left:0;right:0;height:var(--navbar-h);background:#050505d9;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid rgba(255,255,255,.04);display:flex;align-items:center;padding:0 20px;gap:16px;z-index:500}.nav-btn{width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius);transition:background .2s}.nav-btn:hover{background:var(--bg-hover)}.nav-btn svg{width:20px;height:20px;fill:var(--text-secondary);transition:fill .2s}.nav-btn:hover svg{fill:var(--text-primary)}.nav-brand{font-family:var(--font-display);font-size:1.4rem;letter-spacing:3px;cursor:pointer;transition:opacity .2s}.nav-brand:hover{opacity:.8}.nav-spacer{flex:1}.nav-progress{display:flex;align-items:center;gap:10px}.nav-progress-text{font-family:var(--font-mono);font-size:.75rem;color:var(--text-secondary);white-space:nowrap}.nav-progress-bar{width:120px;height:4px;background:var(--bg-elevated);border-radius:2px;overflow:hidden}.nav-progress-fill{height:100%;border-radius:2px;transition:width .6s var(--ease-out)}.sidebar{position:fixed;top:calc(var(--navbar-h) + 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.2s}.chapter-header:hover{background:var(--bg-surface)}.chapter-num{font-family:var(--font-mono);font-size:.7rem;color:var(--text-muted);min-width:20px}.chapter-info{flex:1;min-width:0}.chapter-title{font-size:.85rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chapter-meta{font-size:.7rem;color:var(--text-muted);margin-top:2px;font-family:var(--font-mono)}.chapter-chevron{width:16px;height:16px;fill:var(--text-muted);transition:transform .3s var(--ease-out);flex-shrink:0}.chapter.expanded .chapter-chevron{transform:rotate(90deg)}.chapter-progress-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0;border:1.5px solid var(--text-muted);transition:all .3s}.chapter-progress-dot.partial{border-color:var(--accent);background:transparent}.chapter-progress-dot.complete{border-color:var(--green);background:var(--green)}.chapter-lessons{overflow:hidden;max-height:0;transition:max-height .4s var(--ease-out)}.chapter.expanded .chapter-lessons{max-height:600px}.lesson-item{display:flex;align-items:center;gap:10px;padding:10px 20px 10px 52px;cursor:pointer;transition:all .2s;position:relative}.lesson-item:hover{background:var(--bg-surface)}.lesson-item.active{background:var(--bg-elevated)}.lesson-item.active:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--accent);border-radius:0 2px 2px 0}.lesson-status{width:22px;height:22px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;border:1.5px solid var(--text-muted);transition:all .3s}.lesson-status.completed{border-color:var(--green);background:var(--green)}.lesson-status.completed svg{fill:#fff}.lesson-status.in-progress{border-color:var(--accent);position:relative}.lesson-status.in-progress:after{content:"";position:absolute;inset:3px;border-radius:50%;background:var(--accent)}.lesson-status svg{width:10px;height:10px;fill:transparent}.lesson-name{font-size:.78rem;color:var(--text-secondary);line-height:1.3;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.lesson-item:hover .lesson-name,.lesson-item.active .lesson-name{color:var(--text-primary)}.lesson-type-icon{width:14px;height:14px;fill:var(--text-muted);flex-shrink:0}.main-content{margin-left:var(--sidebar-w);padding-top:calc(var(--navbar-h) + 3px);min-height:100vh;transition:margin-left .4s var(--ease-out)}.sidebar.collapsed~.main-content{margin-left:0}.home{padding:80px 24px;max-width:900px;margin:0 auto}.home h1{font-family:var(--font-display);font-size:clamp(2.5rem,6vw,4rem);letter-spacing:4px;margin-bottom:8px}.home p{color:var(--text-secondary);margin-bottom:48px;font-size:1.05rem}.course-list{display:grid;gap:16px}.course-card{background:var(--bg-surface);border:1px solid 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var(--accent-glow))}}.hero-subtitle{font-family:var(--font-display);font-size:clamp(1rem,3vw,1.6rem);letter-spacing:8px;color:var(--text-secondary);margin-bottom:32px;opacity:0;animation:fadeUp .6s .4s var(--ease-out) forwards}.hero-stats{display:flex;gap:32px;margin-bottom:40px;opacity:0;animation:fadeUp .6s .5s var(--ease-out) forwards}.hero-stat-num{font-family:var(--font-display);font-size:2rem;color:var(--text-primary)}.hero-stat-label{font-family:var(--font-mono);font-size:.65rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:1px}.hero-cta{opacity:0;animation:fadeUp .6s .6s var(--ease-out) forwards}.hero-resume-info{margin-top:12px;font-size:.8rem;color:var(--text-muted);opacity:0;animation:fadeUp .6s .7s var(--ease-out) forwards}.btn-primary{display:inline-flex;align-items:center;gap:10px;padding:14px 36px;color:#fff;font-weight:600;font-size:.95rem;border-radius:var(--radius);transition:all 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var(--ease-bounce)}.chapter-card-check svg{width:12px;height:12px;fill:#fff}.video-wrapper{position:relative;width:100%;background:#000;aspect-ratio:16/9;max-height:calc(100vh - var(--navbar-h) - 3px - 120px)}.video-wrapper video{width:100%;height:100%;display:block;outline:none}.video-loading{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#000c}.spinner{width:40px;height:40px;border:3px solid var(--bg-elevated);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}.video-error{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#000000e6;gap:12px}.video-error p{color:var(--text-secondary);font-size:.9rem}.video-error button{padding:8px 20px;background:var(--bg-elevated);border-radius:var(--radius);font-size:.85rem;transition:background .2s}.video-error button:hover{background:var(--bg-hover)}.pdf-viewer{width:100%;height:calc(100vh - var(--navbar-h) 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svg{width:14px;height:14px;fill:currentColor}.next-overlay{position:absolute;inset:0;background:#000000d9;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;opacity:0;pointer-events:none;transition:opacity .4s}.next-overlay.visible{opacity:1;pointer-events:auto}.next-overlay-label{font-family:var(--font-mono);font-size:.7rem;text-transform:uppercase;letter-spacing:2px;color:var(--text-muted)}.next-overlay-title{font-weight:600;font-size:1.2rem;max-width:400px;text-align:center}.next-overlay-ring{width:60px;height:60px;position:relative;margin:8px 0}.next-overlay-ring svg{width:60px;height:60px;transform:rotate(-90deg)}.next-overlay-ring circle.track{fill:none;stroke:var(--bg-elevated);stroke-width:3}.next-overlay-ring circle.progress{fill:none;stroke:var(--accent);stroke-width:3;stroke-dasharray:163.36;stroke-dashoffset:0;transition:stroke-dashoffset 8s linear}.next-overlay-ring circle.progress.animate{stroke-dashoffset:163.36}.countdown-num{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:1.2rem}.next-overlay-cancel{padding:8px 20px;background:var(--bg-elevated);border-radius:var(--radius);font-size:.85rem;color:var(--text-secondary);transition:all .2s;border:1px solid rgba(255,255,255,.06)}.next-overlay-cancel:hover{color:var(--text-primary);background:var(--bg-hover)}@keyframes fadeUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes checkBounce{0%{transform:scale(0)}60%{transform:scale(1.2)}to{transform:scale(1)}}@keyframes glitchIn{0%{opacity:0;transform:translateY(18px) scale(.98);filter:blur(10px);text-shadow:3px 0 var(--accent),-3px 0 rgba(0,255,255,.45)}30%{opacity:1;transform:translateY(0) skew(-4deg);filter:blur(0);text-shadow:-2px 0 var(--accent),2px 0 rgba(0,255,255,.35)}55%{transform:skew(2deg);text-shadow:2px 0 var(--accent),-2px 0 rgba(0,255,255,.25)}to{opacity:1;transform:none;filter:none;text-shadow:none}}@media(max-width:900px){:root{--sidebar-w:260px}}@media(max-width:768px){.sidebar{position:fixed;transform:translate(-100%);width:280px;z-index:600}.sidebar.open{transform:translate(0)}.sidebar-backdrop.visible{display:block}.main-content{margin-left:0!important}.hero-stats{gap:20px}.chapter-grid{grid-template-columns:1fr}.lesson-bar{flex-wrap:wrap}.lesson-bar-nav{width:100%;justify-content:flex-end}.video-wrapper{aspect-ratio:auto;max-height:50vh}.nav-progress-bar{width:80px}}@media(max-width:480px){.hero{min-height:60vh;padding:40px 16px}.chapter-browser{padding:0 16px 60px}.lesson-bar{padding:12px 16px}}