@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";
:root{--background:#0a0c10;--surface:#12151c;--surface-hover:#1c2030;--surface-active:#232840;--primary:#6366f1;--primary-hover:#4f46e5;--primary-glow:#6366f126;--accent:#38bdf8;--accent-glow:#38bdf81a;--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-tertiary:#64748b;--border:#ffffff12;--border-light:#ffffff1f;--error:#f87171;--success:#34d399;--warning:#fbbf24;--font-sans:"Inter", system-ui, -apple-system, sans-serif;--font-mono:"JetBrains Mono", "Fira Code", monospace;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--shadow-sm:0 2px 8px #0003;--shadow-md:0 8px 24px #0000004d;--shadow-lg:0 16px 48px #0006;--transition-fast:.15s ease;--transition-base:.25s ease;--transition-slow:.4s ease;--kind-concept:#6366f1;--kind-architecture:#8b5cf6;--kind-workflow:#06b6d4;--kind-tooling:#f59e0b;--kind-cloud:#0ea5e9;--kind-container:#3b82f6;--kind-security:#ef4444;--kind-troubleshooting:#f97316;--kind-comparison:#14b8a6;--z-modal:1000;--z-modal-backdrop:999}[data-theme=light]{--background:#f8fafc;--surface:#fff;--surface-hover:#f1f5f9;--surface-active:#e2e8f0;--primary:#4f46e5;--primary-hover:#4338ca;--primary-glow:#4f46e51a;--accent:#0284c7;--accent-glow:#0284c71a;--text-primary:#0f172a;--text-secondary:#334155;--text-tertiary:#64748b;--border:#0000001a;--border-light:#0000000d}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--background);color:var(--text-primary);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.6;overflow-x:hidden}a{color:inherit;text-decoration:none}h1,h2,h3,h4,h5,h6{color:var(--text-primary);margin-bottom:.75rem;font-weight:600;line-height:1.3}h1{letter-spacing:-.025em;font-size:2.25rem}h2{letter-spacing:-.015em;font-size:1.75rem}h3{font-size:1.25rem}p{color:var(--text-secondary);margin-bottom:1rem;line-height:1.7}.glass{-webkit-backdrop-filter:blur(20px);border:1px 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var(--border);border-radius:var(--radius-md);width:100%;color:var(--text-primary);font-size:.85rem;font-family:var(--font-sans);transition:border-color var(--transition-fast), box-shadow var(--transition-fast);outline:none;padding:10px 14px 10px 36px}.sidebar-search input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-glow)}.sidebar-search input::placeholder{color:var(--text-tertiary)}.sidebar-search-icon{color:var(--text-tertiary);pointer-events:none;position:absolute;top:50%;left:16px;transform:translateY(-50%)}.sidebar-nav{flex-direction:column;flex:1;gap:4px;display:flex}.topic-group{margin-bottom:4px}.topic-header{border-radius:var(--radius-sm);cursor:pointer;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.06em;-webkit-user-select:none;user-select:none;transition:color var(--transition-fast), background var(--transition-fast);justify-content:space-between;align-items:center;padding:10px 12px;font-size:.8rem;font-weight:600;display:flex}.topic-header:hover{color:var(--text-secondary);background:var(--surface)}.topic-header .chevron{transition:transform var(--transition-base);flex-shrink:0}.topic-header.expanded .chevron{transform:rotate(90deg)}.topic-videos{transition:max-height var(--transition-slow), opacity var(--transition-base);opacity:0;max-height:0;overflow:hidden}.nav-link{border-radius:var(--radius-sm);color:var(--text-secondary);transition:all var(--transition-fast);border:1px solid #0000;align-items:center;gap:10px;padding:9px 12px 9px 20px;font-size:.88rem;font-weight:450;line-height:1.4;text-decoration:none;display:flex}.nav-link:hover{background:var(--surface-hover);color:var(--text-primary)}.nav-link.active{background:var(--primary-glow);color:var(--primary);border-color:#6366f126;font-weight:500}.nav-link .link-badge{white-space:nowrap;border-radius:4px;flex-shrink:0;padding:2px 7px;font-size:.72rem;font-weight:700}.nav-link .link-badge.day{background:var(--primary-glow);color:var(--primary)}.nav-link .link-badge.bonus{background:var(--accent-glow);color:var(--accent)}.nav-link .link-title{text-overflow:ellipsis;-webkit-line-clamp:2;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}.overview-link{border-radius:var(--radius-md);color:var(--text-secondary);transition:all var(--transition-fast);border:1px solid #0000;align-items:center;gap:8px;margin-bottom:8px;padding:10px 14px;font-size:.9rem;font-weight:500;display:flex}.overview-link:hover{background:var(--surface-hover);color:var(--text-primary)}.overview-link.active{background:var(--primary);color:#fff}.main-content{flex:1;min-width:0;max-width:960px;margin:0 auto;padding:40px 48px}.tab-bar{background:var(--surface);border-radius:var(--radius-md);border:1px solid var(--border);gap:4px;margin-bottom:32px;padding:4px;display:flex}.tab-btn{border-radius:var(--radius-sm);cursor:pointer;font-size:.9rem;font-weight:600;font-family:var(--font-sans);color:var(--text-tertiary);transition:all var(--transition-fast);white-space:nowrap;background:0 0;border:none;flex:1;justify-content:center;align-items:center;gap:8px;padding:10px 16px;display:flex}.tab-btn:hover{color:var(--text-secondary);background:var(--surface-hover)}.tab-btn.active{background:var(--primary);color:#fff;box-shadow:0 2px 8px #6366f14d}.tab-btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.tab-panel{animation:fadeIn var(--transition-base) ease;min-height:300px}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.content-heading{border-bottom:1px solid var(--border);color:var(--text-primary);margin-top:36px;margin-bottom:16px;padding-bottom:8px}.content-paragraph{color:var(--text-secondary);margin-bottom:16px;font-size:1.05rem;line-height:1.75}.content-paragraph code{color:var(--primary);font-size:.88em;font-family:var(--font-mono);background:#6366f11a;border-radius:4px;padding:2px 7px}.content-paragraph strong{color:var(--text-primary);font-weight:600}.content-list{margin-bottom:24px;padding:0;list-style:none}.content-list li{color:var(--text-secondary);padding:8px 0 8px 24px;font-size:1.05rem;line-height:1.6;position:relative}.content-list li:before{content:"▸";color:var(--primary);font-weight:700;position:absolute;left:4px}.content-list li strong{color:var(--text-primary)}.qa-card{border:1px solid var(--border);border-radius:var(--radius-md);transition:border-color var(--transition-fast);margin-bottom:12px;overflow:hidden}.qa-card:hover{border-color:var(--border-light)}.qa-question{cursor:pointer;background:var(--surface);-webkit-user-select:none;user-select:none;transition:background var(--transition-fast);align-items:flex-start;gap:12px;padding:16px 20px;display:flex}.qa-question:hover{background:var(--surface-hover)}.qa-question .qa-icon{background:var(--primary-glow);width:24px;height:24px;color:var(--primary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.75rem;font-weight:700;display:flex}.qa-question .qa-text{color:var(--text-primary);flex:1;font-size:1rem;font-weight:500;line-height:1.5}.qa-question .qa-chevron{transition:transform var(--transition-base);color:var(--text-tertiary);flex-shrink:0}.qa-question.expanded .qa-chevron{transform:rotate(180deg)}.qa-answer{max-height:0;transition:max-height var(--transition-slow);overflow:hidden}.qa-answer.expanded{max-height:1000px}.qa-answer-inner{color:var(--text-secondary);padding:0 20px 16px 56px;font-size:1rem;line-height:1.7}.exercise-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);transition:border-color var(--transition-fast);margin-bottom:16px;padding:24px}.exercise-card:hover{border-color:var(--border-light)}.exercise-card h3{color:var(--accent);align-items:center;gap:8px;margin-bottom:10px;font-size:1.1rem;display:flex}.exercise-card h3:before{content:"🔬"}.exercise-card .exercise-desc{color:var(--text-secondary);margin-bottom:16px;font-size:.95rem;line-height:1.6}.exercise-card ol{counter-reset:step;padding-left:20px;list-style:none}.exercise-card ol li{color:var(--text-secondary);counter-increment:step;padding:6px 0 6px 28px;font-size:.95rem;line-height:1.6;position:relative}.exercise-card ol li:before{content:counter(step);background:var(--primary-glow);width:22px;height:22px;color:var(--primary);border-radius:50%;justify-content:center;align-items:center;font-size:.75rem;font-weight:700;display:flex;position:absolute;top:8px;left:0}.callout{border-radius:var(--radius-md);border:1px solid var(--border);flex-direction:column;gap:10px;margin:24px 0;padding:20px;display:flex}.callout-title{align-items:center;gap:8px;font-size:.95rem;font-weight:600;display:flex}.callout.prerequisite{background:var(--accent-glow);border-color:#38bdf833}.callout.prerequisite .callout-title{color:var(--accent)}.callout.correction{background:#f871710d;border-color:#f8717133}.callout.correction .callout-title{color:var(--error)}.empty-state{text-align:center;color:var(--text-tertiary);padding:60px 20px}.empty-state .empty-icon{opacity:.5;margin-bottom:16px;font-size:3rem}.empty-state p{color:var(--text-tertiary);font-size:.95rem}.nav-footer{border-top:1px solid var(--border);justify-content:space-between;align-items:center;gap:16px;margin-top:48px;padding-top:24px;display:flex}.nav-footer-btn{border-radius:var(--radius-md);transition:all var(--transition-fast);border:1px solid var(--border);color:var(--text-secondary);background:var(--surface);align-items:center;gap:8px;padding:12px 24px;font-size:.9rem;font-weight:500;text-decoration:none;display:inline-flex}.nav-footer-btn:hover{background:var(--surface-hover);color:var(--text-primary);border-color:var(--border-light)}.nav-footer-btn.primary{background:var(--primary);color:#fff;border-color:var(--primary)}.nav-footer-btn.primary:hover{background:var(--primary-hover)}.breadcrumb{color:var(--text-tertiary);align-items:center;gap:8px;margin-bottom:24px;font-size:.85rem;display:flex}.breadcrumb a{color:var(--text-tertiary);transition:color var(--transition-fast)}.breadcrumb a:hover{color:var(--primary)}.breadcrumb .separator{color:var(--text-tertiary);opacity:.5}.breadcrumb .current{color:var(--text-secondary)}.hero-section{text-align:center;padding:40px 0 48px}.hero-title{letter-spacing:-.03em;background:linear-gradient(135deg, var(--primary), var(--accent));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:16px;font-size:2.75rem;font-weight:700}.hero-subtitle{color:var(--text-secondary);max-width:540px;margin:0 auto 32px;font-size:1.15rem;line-height:1.6}.hero-stats{justify-content:center;gap:40px;margin-bottom:36px;display:flex}.hero-stat{text-align:center}.hero-stat .stat-number{color:var(--primary);font-size:2rem;font-weight:700;display:block}.hero-stat .stat-label{color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.05em;font-size:.8rem}.hero-cta{background:var(--primary);color:#fff;border-radius:var(--radius-md);transition:all var(--transition-fast);align-items:center;gap:8px;padding:14px 32px;font-size:1rem;font-weight:600;text-decoration:none;display:inline-flex;box-shadow:0 4px 16px #6366f14d}.hero-cta:hover{background:var(--primary-hover);transform:translateY(-2px);box-shadow:0 6px 24px #6366f166}.topics-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin-top:48px;display:grid}.topic-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);text-align:left;transition:all var(--transition-fast);padding:24px;text-decoration:none;display:block}.topic-card:hover{border-color:var(--primary);box-shadow:var(--shadow-md);transform:translateY(-2px)}.topic-card h3{color:var(--text-primary);margin-bottom:6px;font-size:1rem}.topic-card .card-count{color:var(--text-tertiary);font-size:.8rem}pre{border:1px solid var(--border);border-radius:var(--radius-md);color:#e2e8f0;font-family:var(--font-mono);background:#000;margin:16px 0;padding:16px;font-size:.9rem;overflow-x:auto}code{font-family:var(--font-mono);color:var(--primary);background:#6366f11a;border-radius:4px;padding:2px 6px;font-size:.88em}pre code{color:inherit;background:0 0;padding:0}.back-to-top{background:var(--primary);color:#fff;cursor:pointer;width:44px;height:44px;box-shadow:var(--shadow-md);opacity:0;transition:opacity var(--transition-base), transform var(--transition-base);z-index:50;border:none;border-radius:50%;justify-content:center;align-items:center;display:flex;position:fixed;bottom:32px;right:32px;transform:translateY(16px)}.back-to-top.visible{opacity:1;transform:translateY(0)}.back-to-top:hover{background:var(--primary-hover);transform:translateY(-2px)}.hamburger-btn{z-index:200;border-radius:var(--radius-sm);background:var(--surface);border:1px solid var(--border);width:44px;height:44px;color:var(--text-primary);cursor:pointer;box-shadow:var(--shadow-sm);justify-content:center;align-items:center;font-size:1.3rem;display:none;position:fixed;top:16px;left:16px}.sidebar-overlay{display:none}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--surface-hover);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}*{scrollbar-width:thin;scrollbar-color:var(--surface-hover) transparent}a:focus-visible,button:focus-visible{outline:2px solid var(--primary);outline-offset:2px}@media (max-width:1024px){.main-content{padding:32px 24px}}@media (max-width:768px){.hamburger-btn{display:flex}.sidebar{z-index:150;background:var(--background);width:300px;height:100vh;transition:left var(--transition-base);position:fixed;top:0;left:-100%}.sidebar.sidebar-open{left:0}.sidebar-overlay{z-index:140;opacity:0;pointer-events:none;transition:opacity var(--transition-base);background:#0009;display:block;position:fixed;inset:0}.sidebar-overlay.visible{opacity:1;pointer-events:all}.main-content{max-width:100%;padding:72px 16px 32px}.hero-title{font-size:2rem}.hero-stats{flex-wrap:wrap;gap:24px}.topics-grid{grid-template-columns:1fr}.nav-footer{flex-direction:column}.nav-footer-btn{justify-content:center;width:100%}.tab-bar{overflow-x:auto}.tab-btn{padding:8px 12px;font-size:.82rem}}@media (max-width:480px){h1{font-size:1.75rem}h2{font-size:1.35rem}.hero-title{font-size:1.75rem}.hero-subtitle{font-size:1rem}.hero-stat .stat-number{font-size:1.5rem}}.sidebar-title{color:var(--primary);letter-spacing:-.01em;margin-bottom:4px;font-size:1.15rem}.sidebar-subtitle{color:var(--text-tertiary);margin:0;font-size:.8rem}.sidebar-search-wrapper{margin-bottom:8px;padding:0 4px;position:relative}.sidebar-search-wrapper .search-icon{color:var(--text-tertiary);pointer-events:none;z-index:1;position:absolute;top:50%;left:16px;transform:translateY(-50%)}input.sidebar-search{background:var(--surface);border:1px solid 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var(--transition-base);color:var(--text-tertiary);flex-shrink:0}.chevron-expanded{transform:rotate(90deg)}.nav-link-badge{white-space:nowrap;background:var(--primary-glow);color:var(--primary);border-radius:4px;flex-shrink:0;padding:2px 7px;font-size:.72rem;font-weight:700}.nav-link-title{text-overflow:ellipsis;-webkit-line-clamp:2;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}.nav-link-icon{flex-shrink:0}.sidebar-empty{text-align:center;color:var(--text-tertiary);padding:20px;font-size:.85rem}.tab-content{min-height:300px}.rich-bold{color:var(--text-primary);font-weight:600}.rich-code{color:var(--primary);font-size:.88em;font-family:var(--font-mono);background:#6366f11a;border-radius:4px;padding:2px 7px}.qa-accordion{border:1px solid var(--border);border-radius:var(--radius-md);transition:border-color var(--transition-fast);margin-bottom:12px;overflow:hidden}.qa-accordion:hover{border-color:var(--border-light)}.qa-accordion__trigger{cursor:pointer;background:var(--surface);text-align:left;width:100%;font-family:var(--font-sans);transition:background var(--transition-fast);border:none;align-items:flex-start;gap:12px;padding:16px 20px;display:flex}.qa-accordion__trigger:hover{background:var(--surface-hover)}.qa-accordion__icon{background:var(--primary-glow);width:26px;height:26px;color:var(--primary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.75rem;font-weight:700;display:flex}.qa-accordion__icon--answer{background:var(--accent-glow);color:var(--accent)}.qa-accordion__question{color:var(--text-primary);flex:1;font-size:1rem;font-weight:500;line-height:1.5}.qa-accordion__chevron{color:var(--text-tertiary);transition:transform var(--transition-base);flex-shrink:0;margin-top:4px;font-size:.7rem}.qa-accordion__body{max-height:0;transition:max-height var(--transition-slow);overflow:hidden}.qa-accordion--open .qa-accordion__body{max-height:1000px}.qa-accordion__answer{color:var(--text-secondary);align-items:flex-start;gap:12px;padding:0 20px 16px;font-size:1rem;line-height:1.7;display:flex}.exercise-card__header{align-items:center;gap:8px;margin-bottom:10px;display:flex}.exercise-card__badge{font-size:1.2rem}.exercise-card__title{color:var(--accent);margin:0;font-size:1.1rem}.exercise-card__desc{color:var(--text-secondary);margin-bottom:16px;font-size:.95rem;line-height:1.6}.exercise-card__steps{counter-reset:step;padding-left:0;list-style:none}.exercise-card__step{color:var(--text-secondary);align-items:flex-start;gap:12px;padding:6px 0;font-size:.95rem;line-height:1.6;display:flex}.exercise-card__step-num{background:var(--primary-glow);width:24px;height:24px;color:var(--primary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;margin-top:2px;font-size:.75rem;font-weight:700;display:flex}.content-list__title{color:var(--text-primary);margin-bottom:10px;font-size:1.1rem}.content-list__items{padding:0;list-style:none}.content-list__item{color:var(--text-secondary);padding:6px 0 6px 24px;font-size:1.05rem;line-height:1.6;position:relative}.content-list__item:before{content:"▸";color:var(--primary);font-weight:700;position:absolute;left:4px}.content-list__item strong{color:var(--text-primary)}.callout--prerequisite{background:var(--accent-glow);border-color:#38bdf833}.callout--prerequisite .callout__title{color:var(--accent)}.callout--correction{background:#f871710d;border-color:#f8717133}.callout--correction .callout__title{color:var(--error)}.callout__title{align-items:center;gap:8px;font-size:.95rem;font-weight:600;display:flex}.callout__icon{flex-shrink:0}.callout__body{color:var(--text-secondary);font-size:1rem;line-height:1.7}.empty-state__icon{opacity:.5;margin-bottom:16px;font-size:3rem;display:block}.empty-state__text{color:var(--text-secondary);margin-bottom:4px;font-size:1rem}.empty-state__subtext{color:var(--text-tertiary);font-size:.85rem}.sidebar-resizer{cursor:col-resize;z-index:10;width:5px;height:100%;transition:background var(--transition-fast);position:absolute;top:0;right:-2px}.sidebar-resizer:hover,.sidebar-resizer.is-resizing{background:var(--primary)}.markdown-content{line-height:1.7}.markdown-content p{margin-bottom:1rem}.markdown-content p:last-child{margin-bottom:0}.markdown-content h1,.markdown-content h2,.markdown-content h3,.markdown-content h4,.markdown-content h5,.markdown-content 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