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ease}.ovl-sidebar-level-header:hover{background:var(--ovl-accent-subtle);color:var(--ovl-text)}.ovl-sidebar-level--active>.ovl-sidebar-level-header{color:var(--ovl-accent);font-weight:600;background:var(--ovl-accent-medium);border-left:3px solid var(--ovl-accent);padding-left:21px}.ovl-sidebar-level-number{font-family:var(--font-mono);font-size:12px;color:var(--ovl-accent);font-weight:500;flex-shrink:0}.ovl-sidebar-level-title{font-size:12px}.ovl-sidebar-lessons{padding:4px 0 12px}.ovl-sidebar-lesson{display:flex;align-items:center;gap:6px;padding:6px 16px 6px 42px;color:var(--ovl-text-secondary);border-left:3px solid transparent;transition:all .15s ease}.ovl-sidebar-lesson:hover{color:var(--ovl-text);background:var(--ovl-accent-subtle)}.ovl-sidebar-lesson--active{color:var(--ovl-accent);font-weight:600;border-left-color:var(--ovl-accent);background:var(--ovl-accent-medium)}.ovl-content{flex:1;min-width:0;max-width:1140px;padding:32px 48px 80px}.ovl-breadcrumbs{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-family:var(--font-mono);font-size:12px;color:var(--ovl-text-tertiary);margin-bottom:32px}.ovl-crumb{color:var(--ovl-text-secondary)!important}.ovl-crumb:hover{color:var(--ovl-accent)!important}.ovl-crumb--current{color:var(--ovl-text)!important;cursor:default}.ovl-crumb-sep{color:var(--ovl-text-tertiary);-webkit-user-select:none;user-select:none}.ovl-index-header{margin-bottom:48px}.ovl-index-title{font-family:var(--font-display);font-size:clamp(2rem,5vw,2.8rem);font-weight:800;color:var(--ovl-text);line-height:1.1;margin-bottom:12px}.ovl-index-subtitle{font-size:1.15rem;color:var(--ovl-text-secondary);line-height:1.6;margin-bottom:8px}.ovl-index-intro{font-size:1rem;color:var(--ovl-text-secondary);line-height:1.6}.ovl-index-grid{display:flex;flex-direction:column;gap:2px}.ovl-with-rail{display:grid;grid-template-columns:1fr 260px;gap:40px;align-items:start}.ovl-main{min-width:0}.ovl-rail{position:sticky;top:80px;display:flex;flex-direction:column;gap:16px}.ovl-rail-section{border:1px solid var(--ovl-border);background:var(--ovl-accent-subtle)}.ovl-rail-section-header{font-family:var(--font-mono);font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--ovl-text-tertiary);padding:14px 16px 10px;border-bottom:1px solid var(--ovl-border)}.ovl-rail-list{display:flex;flex-direction:column}.ovl-rail-list-item{display:block;padding:10px 16px;border-bottom:1px solid var(--ovl-border);color:var(--ovl-text)!important;transition:background .15s ease}.ovl-rail-list-item:last-child{border-bottom:none}.ovl-rail-list-item:hover{background:var(--ovl-accent-subtle)}.ovl-rail-list-top{display:flex;align-items:center;gap:8px;margin-bottom:2px}.ovl-rail-list-level{font-family:var(--font-mono);font-size:10px;color:var(--ovl-text-tertiary);letter-spacing:.02em}.ovl-rail-list-title{font-size:13px;font-weight:500;line-height:1.3;color:var(--ovl-text)}.ovl-rail-levels{display:flex;flex-direction:column}.ovl-rail-level-link{display:flex;align-items:center;gap:10px;padding:10px 16px;border-bottom:1px solid var(--ovl-border);color:var(--ovl-text)!important;transition:background .15s ease}.ovl-rail-level-link:last-child{border-bottom:none}.ovl-rail-level-link:hover{background:var(--ovl-accent-subtle)}.ovl-rail-level-num{font-family:var(--font-mono);font-size:16px;font-weight:700;color:var(--ovl-border-strong);width:28px;flex-shrink:0}.ovl-rail-level-title{font-size:13px;font-weight:500;color:var(--ovl-text)}.ovl-rail-toc{display:flex;flex-direction:column}.ovl-rail-toc-link{display:block;padding:7px 16px;font-size:12px;line-height:1.4;color:var(--ovl-text-secondary)!important;border-left:2px solid transparent;transition:background .15s ease,border-color .15s ease,color .15s ease}.ovl-rail-toc-link:hover{background:var(--ovl-accent-subtle);border-left-color:var(--ovl-accent);color:var(--ovl-accent)!important}.ovl-rail-signin{padding:16px;border:1px solid var(--ovl-accent-medium);background:var(--ovl-accent-subtle)}.ovl-rail-signin .ovl-rail-section-header{padding:0 0 10px;border-bottom:none}.ovl-rail-signin-text{font-size:12px;line-height:1.5;color:var(--ovl-text-secondary);margin:0 0 12px}.ovl-rail-signin-btn{display:block;width:100%;padding:8px 0;font-family:var(--font-mono);font-size:11px;font-weight:600;text-align:center;color:#fff;background:var(--ovl-accent);border:none;cursor:pointer;transition:background .15s ease}.ovl-rail-signin-btn:hover{background:var(--ovl-accent-hover)}@media(max-width:900px){.ovl-with-rail{grid-template-columns:1fr}.ovl-rail{position:static}}.ovl-level-card{display:flex;align-items:flex-start;gap:24px;padding:28px 24px;border:1px solid var(--ovl-border);color:var(--ovl-text)!important;transition:background .2s ease,border-color .2s ease}.ovl-level-card:hover{background:var(--ovl-accent-subtle);border-color:var(--ovl-accent-medium)}.ovl-level-card-number{font-family:var(--font-mono);font-size:clamp(2rem,4vw,2.8rem);font-weight:700;color:var(--ovl-border);line-height:1;flex-shrink:0;width:64px}.ovl-level-card-body{flex:1;min-width:0}.ovl-level-card-title{font-family:var(--font-display);font-size:1.25rem;font-weight:700;margin-bottom:4px;color:var(--ovl-text)}.ovl-level-card-subtitle{font-size:.95rem;color:var(--ovl-text-secondary);line-height:1.5;margin-bottom:10px}.ovl-level-card-meta{display:flex;gap:16px;font-family:var(--font-mono);font-size:11px;color:var(--ovl-text-tertiary);letter-spacing:.02em}.ovl-level-card-status{color:var(--ovl-accent)}.ovl-level-header{margin-bottom:48px}.ovl-level-header-number{font-family:var(--font-mono);font-size:clamp(3rem,8vw,5rem);font-weight:800;color:var(--ovl-border);line-height:1;margin-bottom:8px}.ovl-level-header-title{font-family:var(--font-display);font-size:clamp(2rem,5vw,3rem);font-weight:800;color:var(--ovl-text);line-height:1.1;margin-bottom:8px}.ovl-level-header-subtitle{font-size:1.2rem;color:var(--ovl-text-secondary);font-style:italic;margin-bottom:16px}.ovl-level-header-desc{font-size:1.05rem;color:var(--ovl-text);line-height:1.7}.ovl-level-lesson-list{margin-top:32px}.ovl-level-lesson-list-label{font-family:var(--font-mono);font-size:11px;font-weight:600;color:var(--ovl-accent);letter-spacing:.1em;text-transform:uppercase;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--ovl-border)}.ovl-level-lesson-item{display:flex;align-items:center;gap:16px;padding:16px;border-bottom:1px solid var(--ovl-border);color:var(--ovl-text)!important;transition:background .15s 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0;padding:20px 24px;border-left:3px solid var(--ovl-accent);background:var(--ovl-accent-subtle);font-size:1.05rem;line-height:1.7;color:var(--ovl-text);font-style:italic}.ovl-block-exercise{margin:36px 0;padding:24px;border:1px solid rgba(0,170,68,.3);background:#00aa440a;border-radius:4px}.ovl-exercise-label{font-family:var(--font-mono);font-size:11px;font-weight:600;color:var(--ovl-success);letter-spacing:.1em;text-transform:uppercase;margin-bottom:8px}.ovl-exercise-title{font-family:var(--font-display);font-size:1.1rem;font-weight:700;color:var(--ovl-text);margin-bottom:8px}.ovl-block-code{margin:36px 0;background:#0a0a0a;color:#e0e0e0;padding:20px 24px;font-family:var(--font-mono);font-size:14px;line-height:1.6;overflow-x:auto;border-radius:4px}.ovl-block-resources{margin:40px 0;padding:24px 28px;background:var(--ovl-accent-subtle);border-left:3px solid var(--ovl-accent);border-radius:4px}.ovl-resource-list{list-style:none;padding:0;margin:12px 0 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ovl-spin{to{transform:rotate(360deg)}}.ovl-signout-btn{font-family:var(--font-mono);font-size:11px;color:var(--ovl-text-tertiary);background:none;border:none;cursor:pointer;padding:0}.ovl-signout-btn:hover{color:var(--ovl-text-secondary)}.ovl-nav-group{position:relative}.ovl-nav-group-trigger{font-family:var(--font-mono);font-size:12px;font-weight:500;color:var(--ovl-text-secondary);background:none;border:none;cursor:pointer;padding:4px 0;display:flex;align-items:center;gap:4px;transition:color .15s ease;letter-spacing:.02em}.ovl-nav-group-trigger:hover{color:var(--ovl-text)}.ovl-nav-group-trigger--active{color:var(--ovl-accent)!important}.ovl-nav-more{display:flex;align-items:center;height:100%}.ovl-nav-more .ovl-nav-group-trigger{height:100%;padding:0 16px;font-weight:600;color:var(--ovl-text-tertiary);border-bottom:2px solid transparent}.ovl-nav-more .ovl-nav-group-trigger--active{color:var(--ovl-accent)!important;border-bottom-color:var(--ovl-accent)}.ovl-nav-more 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12px;border-radius:4px;cursor:pointer;width:100%;transition:color .15s ease,border-color .15s ease}.ovl-user-dropdown-signout:hover{color:var(--ovl-text);border-color:var(--ovl-accent)}.ovl-signin-prompt{display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--ovl-accent-subtle);border:1px solid var(--ovl-accent-medium);border-radius:6px;padding:14px 20px;margin-bottom:32px}.ovl-signin-prompt-text{font-family:var(--font-mono);font-size:13px;color:var(--ovl-text-secondary);margin:0}.ovl-signin-prompt-btn{font-family:var(--font-mono);font-size:12px;font-weight:500;color:#fff;background:var(--ovl-accent);border:none;padding:8px 16px;border-radius:4px;cursor:pointer;white-space:nowrap;transition:background .15s}.ovl-signin-prompt-btn:hover{background:var(--ovl-accent-hover)}.ovl-badge{display:inline-block;font-family:var(--font-mono);font-size:9px;font-weight:600;text-transform:uppercase;letter-spacing:.08em;padding:2px 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.ovl-mark-complete-check,.ovl-mark-complete-btn--done .ovl-mark-complete-label{color:#fff}.ovl-mark-complete-btn--done:hover{background:var(--ovl-accent-hover);border-color:var(--ovl-accent-hover)}.ovl-progress-ring{position:relative;width:28px;height:28px;flex-shrink:0}.ovl-progress-svg{width:100%;height:100%;transform:rotate(-90deg)}.ovl-progress-track{stroke:var(--ovl-border)}.ovl-progress-fill{stroke:var(--ovl-accent);stroke-linecap:round;transition:stroke-dasharray .3s ease}.ovl-progress-text{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:8px;font-weight:600;color:var(--ovl-accent)}.ovl-level-progress{display:flex;align-items:center;gap:12px;margin-top:16px}.ovl-level-progress-bar{flex:1;height:4px;background:var(--ovl-border);border-radius:2px;overflow:hidden}.ovl-level-progress-fill{height:100%;background:var(--ovl-accent);border-radius:2px;transition:width .3s 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