@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800&display=swap&subset=latin";:root{--bg-primary:#0d0d14;--bg-secondary:#12121c;--bg-card:#171724;--bg-hover:#1e1e2e;--surface-color:var(--bg-card);--text-primary:#f0f0f8;--text-secondary:#88a;--text-muted:#55556a;--accent-primary:#7c5cf6;--accent-secondary:#3b82f6;--accent-green:#10b981;--accent-yellow:#f59e0b;--warning-bg:#f59e0b1a;--warning-border:#f59e0b4d;--warning-text:#fbbf24;--warning-link:#fcd34d;--solution-bg:#10b9811a;--solution-border:#10b98159;--solution-header:#34d399;--border-color:#ffffff12;--border-active:#7c5cf680;--bg-subtle:#ffffff08;--bg-subtle-hover:#ffffff0f;--border-subtle:#ffffff14;--header-nav-bg:#ffffff08;--header-nav-border:#ffffff14;--bottom-nav-bg:#0d0d14;--bottom-nav-border:#ffffff14;--fade-color:#ffffff03;--shadow-subtle:0 4px 20px #00000026;--btn-outline-hover-border:#ffffff2e;--btn-primary-bg:var(--accent-primary);--btn-primary-hover:#8b5cf6;--btn-primary-active:#6d28d9;--btn-outline-bg:#ffffff0d;--btn-outline-hover:#ffffff1a;--btn-outline-active:#ffffff26;--btn-secondary-bg:transparent;--btn-secondary-hover:#7c5cf614;--btn-secondary-active:#7c5cf626;--section-logic-bg:#7c5cf60f;--section-logic-border:#7c5cf640;--section-karel-bg:#3b82f60f;--section-karel-border:#3b82f640;--section-auth-bg:#10b9810f;--section-auth-border:#10b98140;--glass-bg:#14141e;--glass-border:none;--glass-shadow:none;--font-family:"Inter", system-ui, -apple-system, sans-serif;--sp-1:.25rem;--sp-2:.5rem;--sp-3:.75rem;--sp-4:1rem;--sp-5:1.25rem;--sp-6:1.5rem;--sp-8:2rem;--sp-10:2.5rem;--sp-12:3rem;--spacing-xs:var(--sp-1);--spacing-sm:var(--sp-2);--spacing-md:var(--sp-4);--spacing-lg:var(--sp-6);--spacing-xl:var(--sp-8);--spacing-2xl:var(--sp-12);--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--transition-fast:.12s ease;--transition-normal:.18s ease;--heading-gradient:linear-gradient(135deg, #fff 0%, #9090bb 100%);--map-bg:#09090f;--map-grid-color:#ffffff05;--map-node-bg:#12121ceb;--bg-tooltip:#12121ceb;--bg-floating:#14141ee0;--border-floating:#7c5cf666;--shadow-floating:0 -4px 30px #0006, 0 0 24px #7c5cf61f;--border-floating-login:#f59e0b66;--shadow-floating-login:0 -4px 30px #0006, 0 0 24px #f59e0b1f;--nudge-bg:linear-gradient(135deg, #f59e0b14, #6366f108);--nudge-border:#f59e0b40;--nudge-title:#fff;--nudge-text:#cbd5e1;--bp-surface:#081020a6;--bp-input-bg:#050c1cbf;--cs-input-bg:#0a1428b3;--panel-fade:#171724f2;--track-bg:#ffffff14;--payment-surface:#00000040;--payment-divider:#ffffff0d;--payment-chip:#ffffff0a;--karel-heading:linear-gradient(135deg, #60a5fa, #3b82f6);--java-heading:linear-gradient(135deg, #a5b4fc, #6366f1);--cpp-heading:linear-gradient(135deg, #f87171, #ef4444);--guide-surface:#0f172a66;--guide-border:#1e293b;--guide-text:#cbd5e1;--locked-nav-opacity:.5;--disabled-opacity:.4;--disabled-tab-opacity:.45;--disabled-card-opacity:.65;--input-surface:#0003;--nona-input-border:#ffffff24;--junior-control-fade:#141823f2;--career-heading:linear-gradient(135deg, var(--text-primary), #a78bfa, #60a5fa);--portal-bg:#07080c;--portal-surface:#090d16;--portal-header:#08090df5;--portal-text:#f8fafc;--portal-border:#ffffff1f;--portal-footer:#ffffff05;--current-chip-text:#fbbf24;--mission-text:#fff9;--mission-text-55:#ffffff8c;--mission-text-70:#ffffffb3;--mission-status:#fff6;--mission-text-65:#ffffffa6;--mission-cyan-faint:#38bdf833;--mission-hint-text:#fbbf24cc;--mission-hint-text-75:#fbbf24bf;--mission-control-bg:#ffffff0d;--simulation-panel-60:#0a142899;--simulation-panel-70:#0a1428b3;--decision-option-bg:#0a142866;--decision-option-border:#fff3;--decision-feedback-text:#fffc;--simulation-slate:#0f172aa6;--code-green:#22c55e;--bughunt-accent-text:#f472b6;--python-heading:linear-gradient(135deg, #34d399, #059669);--python-task-text:#059669;--syntax-brand-heading:linear-gradient(135deg, #10b981, #3b82f6);--syntax-code-panel:#050a1899;--code-cyan:#38bdf8;--code-indigo:#a5b4fc;--code-violet:#818cf8;--code-amber:#fbbf24;--code-yellow:#fcd34d;--code-lavender:#c7d2fe;--bp-surface-strong:#081020e0;--bp-surface-locked:#0f172acc;--bp-popover:#0f172afa;--bp-border:#ffffff1a;--bp-text-faint:#fff6;--bp-text:#fff;--bp-text-locked:#e2e8f0;--bp-text-soft:#ffffffa6;--card-locked-bg:#0003;--hero-title:#fff;--hero-subtitle:#94a3b8;--hero-pill-bg:#1e1b4b;--hero-pill-text:#c7d2fe}:root[data-theme=light]{--bg-primary:#f0f2f8;--bg-secondary:#f8f9fc;--bg-card:#fff;--bg-hover:#edf0f7;--surface-color:var(--bg-card);--text-primary:#0d1426;--text-secondary:#3d4f70;--text-muted:#55658a;--accent-primary:#6d3cf0;--accent-secondary:#2563eb;--accent-green:#059669;--accent-yellow:#d97706;--warning-bg:#d9770614;--warning-border:#d9770640;--warning-text:#b45309;--warning-link:#92400e;--solution-bg:#05966914;--solution-border:#0596694d;--solution-header:#047857;--border-color:#0f1e501f;--border-active:#6d3cf08c;--bg-subtle:#0f1e500d;--bg-subtle-hover:#0f1e5017;--border-subtle:#0f1e501a;--header-nav-bg:#ffffffb3;--header-nav-border:#0f1e501a;--bottom-nav-bg:#f5f7fc;--bottom-nav-border:#0f1e501a;--fade-color:#f0f2f803;--shadow-subtle:0 4px 20px #0f1e5014;--btn-outline-hover-border:#0f1e5038;--btn-primary-bg:var(--accent-primary);--btn-primary-hover:#5b21b6;--btn-primary-active:#4c1d95;--btn-outline-bg:#0f1e500a;--btn-outline-hover:#0f1e5014;--btn-outline-active:#0f1e501f;--btn-secondary-bg:transparent;--btn-secondary-hover:#6d3cf014;--btn-secondary-active:#6d3cf026;--section-logic-bg:#6d3cf00f;--section-logic-border:#6d3cf033;--section-karel-bg:#2563eb0f;--section-karel-border:#2563eb33;--section-auth-bg:#0596690f;--section-auth-border:#05966933;--glass-bg:#fff;--glass-border:none;--glass-shadow:none;--heading-gradient:linear-gradient(135deg, #0d1426 0%, #3d4f70 100%);--map-bg:#e8ecf5;--map-grid-color:#2563eb1f;--map-node-bg:#fffffffa;--bg-tooltip:#fffffffa;--bg-floating:#fffffff7;--border-floating:#6d3cf04d;--shadow-floating:0 8px 40px #0f1e5024, 0 0 24px #6d3cf01a;--border-floating-login:#d977064d;--shadow-floating-login:0 8px 40px #0f1e5024, 0 0 24px #d977061a;--nudge-bg:linear-gradient(135deg, #d9770612, #6366f10d);--nudge-border:#d9770640;--nudge-title:var(--text-primary);--nudge-text:var(--text-secondary);--bp-surface:#fffffff2;--bp-input-bg:#fff;--cs-input-bg:#fff;--panel-fade:#fff;--track-bg:#0f1e501a;--payment-surface:#f5f7fc;--payment-divider:#0f1e501f;--payment-chip:#0f1e500d;--karel-heading:linear-gradient(135deg, #1d4ed8, #1e40af);--java-heading:linear-gradient(135deg, #4338ca, #3730a3);--cpp-heading:linear-gradient(135deg, #b91c1c, #991b1b);--guide-surface:#fff;--guide-border:#0f1e5029;--guide-text:var(--text-secondary);--locked-nav-opacity:.7;--disabled-opacity:.55;--disabled-tab-opacity:.7;--disabled-card-opacity:.8;--input-surface:#fff;--nona-input-border:#0f1e5029;--junior-control-fade:#fff;--career-heading:linear-gradient(135deg, var(--text-primary), #6d28d9, #1d4ed8);--portal-bg:var(--bg-primary);--portal-surface:var(--bg-card);--portal-header:#fffffff5;--portal-text:var(--text-primary);--portal-border:#0f1e5029;--portal-footer:#0f1e500a;--current-chip-text:#92400e;--mission-text:var(--text-secondary);--mission-text-55:var(--text-secondary);--mission-text-70:var(--text-secondary);--mission-status:var(--text-muted);--mission-text-65:var(--text-secondary);--mission-cyan-faint:#0369a1;--mission-hint-text:#92400e;--mission-hint-text-75:#92400e;--mission-control-bg:var(--bg-subtle);--simulation-panel-60:#0a1428;--simulation-panel-70:#0a1428;--decision-option-bg:#fff;--decision-option-border:#0f1e5033;--decision-feedback-text:var(--text-secondary);--simulation-slate:#0f172a;--code-green:#22c55e;--bughunt-accent-text:#be185d;--python-heading:linear-gradient(135deg, #047857, #065f46);--python-task-text:#047857;--syntax-brand-heading:linear-gradient(135deg, #047857, #1d4ed8);--syntax-code-panel:#050a18;--code-cyan:#38bdf8;--code-indigo:#a5b4fc;--code-violet:#818cf8;--code-amber:#fbbf24;--code-yellow:#fcd34d;--code-lavender:#c7d2fe;--bp-surface-strong:#fffffff7;--bp-surface-locked:#e8ecf6f2;--bp-popover:#fff;--bp-border:#0f1e5029;--bp-text-faint:var(--text-muted);--bp-text:var(--text-primary);--bp-text-locked:var(--text-secondary);--bp-text-soft:var(--text-secondary);--card-locked-bg:#0f1e500d;--hero-title:var(--text-primary);--hero-subtitle:var(--text-secondary);--hero-pill-bg:#4f46e5;--hero-pill-text:#fff}*,:before,:after{box-sizing:border-box;margin:0;padding:0}a{color:inherit;text-decoration:none}ul{list-style:none}img,svg{max-width:100%;display:block}button{font-family:inherit}html{max-width:100vw;overflow-x:clip}html,body{overscroll-behavior-y:contain}body{font-family:var(--font-family);background-color:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;text-rendering:optimizespeed;max-width:100vw;min-height:100dvh;line-height:1.6;overflow-x:clip}#root{flex-direction:column;max-width:100vw;min-height:100dvh;display:flex;overflow-x:clip}button,.btn,.site-bottom-nav__link,svg,img,.live-badge,.section-label,.filter-button,.pathfinder-option-btn,.interactive-cell,.blocklyWidgetDiv,.blocklyToolboxDiv{-webkit-user-select:none;user-select:none}a,button,.btn,.filter-button,.site-bottom-nav__link,.pathfinder-option-btn{touch-action:manipulation}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.2}.heading-gradient{background:var(--heading-gradient);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.section-label{letter-spacing:.12em;text-transform:uppercase;border-radius:var(--radius-full);margin-bottom:var(--sp-3);align-items:center;gap:6px;padding:3px 10px;font-size:.7rem;font-weight:700;display:inline-flex}.section-label--logic{color:#a78bfa;background:#7c5cf61f}.section-label--karel{color:#60a5fa;background:#3b82f61f}.section-label--auth{color:#34d399;background:#10b9811f}.card-base{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--sp-5);contain:layout;transform:translateZ(0)}:root[data-theme=light] .card-base{box-shadow:0 2px 12px #0f1e5012}.card-hover{cursor:pointer;transition:border-color var(--transition-normal), background var(--transition-normal)}.card-hover:hover{background:var(--bg-hover);border-color:#7c5cf659}.card-hover:active{transform:scale(.98)}.btn{align-items:center;gap:var(--sp-2);padding:var(--sp-2) var(--sp-4);border-radius:var(--radius-md);cursor:pointer;transition:opacity var(--transition-fast), transform var(--transition-fast);white-space:nowrap;border:none;font-size:.9rem;font-weight:600;line-height:1.4;display:inline-flex}.btn:active{transform:scale(.96)}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}.btn-primary{background:var(--accent-primary);color:#fff}.btn-primary:hover:not(:disabled){opacity:.88}.btn-blue{background:var(--accent-secondary);color:#fff}.btn-blue:hover:not(:disabled){opacity:.88}.btn-outline{border:1px solid var(--border-color);color:var(--text-secondary);background:0 0}.btn-outline:hover:not(:disabled){border-color:var(--btn-outline-hover-border);color:var(--text-primary)}.btn-ghost{color:var(--text-secondary);padding:var(--sp-2);background:0 0;border:none}.btn-ghost:hover:not(:disabled){color:var(--text-primary)}.btn-custom{justify-content:center;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);font-family:var(--font-family);cursor:pointer;transition:background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);border:none;outline:none;font-weight:600;display:inline-flex}.btn-custom-primary{background:var(--btn-primary-bg);color:var(--text-primary);box-shadow:0 4px 14px #8b5cf663}.btn-custom-primary:hover:not(:disabled){background:var(--btn-primary-hover);color:#fff;box-shadow:0 6px 20px #8b5cf680}.btn-custom-primary:active:not(:disabled){background:var(--btn-primary-active)}.btn-custom-secondary{background:var(--btn-secondary-bg);border:1px solid var(--accent-primary);color:var(--accent-primary)}.btn-custom-secondary:hover:not(:disabled){background:var(--btn-secondary-hover);color:var(--accent-primary)}.btn-custom-secondary:active:not(:disabled){background:var(--btn-secondary-active)}.btn-custom-outline{background:var(--btn-outline-bg);border:1px solid var(--border-color);color:var(--text-primary)}.btn-custom-outline:hover:not(:disabled){background:var(--btn-outline-hover);border-color:var(--btn-outline-hover-border)}.btn-custom-outline:active:not(:disabled){background:var(--btn-outline-active)}.filter-bar{background:var(--bg-subtle);border:1px solid var(--border-color);border-radius:var(--radius-full);scrollbar-width:none;align-items:center;gap:3px;padding:3px;display:flex;overflow-x:auto}.filter-bar::-webkit-scrollbar{display:none}.filter-button{border-radius:var(--radius-full);cursor:pointer;transition:background var(--transition-fast), color var(--transition-fast);white-space:nowrap;border:none;align-items:center;gap:5px;padding:6px 14px;font-size:.82rem;font-weight:600;line-height:1.4;display:flex}.filter-button.active{background:var(--accent-primary);color:#fff}.filter-button.inactive{color:var(--text-secondary);background:0 0}.filter-button.inactive:hover{color:var(--text-primary)}.search-container{background:var(--bg-subtle);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:0 var(--sp-4);transition:border-color var(--transition-fast);align-items:center;display:flex}.search-container:focus-within{border-color:var(--accent-primary)}.search-input{color:var(--text-primary);padding:var(--sp-3) var(--sp-2);background:0 0;border:none;outline:none;flex:1;font-family:inherit;font-size:.95rem}.search-input::placeholder{color:var(--text-muted)}.stat-card{align-items:center;gap:var(--sp-3);padding:var(--sp-3) var(--sp-4);border-radius:var(--radius-md);background:#7c5cf612;border:1px solid #7c5cf62e;display:flex}.hero-icon-container{margin-bottom:var(--sp-6);filter:drop-shadow(0 12px 24px #7c5cf673);background:0 0;justify-content:center;align-items:center;padding:0;display:inline-flex}.mode-card{text-align:center;padding:var(--sp-6);border-radius:var(--radius-xl);border:1px solid var(--border-color);background:var(--bg-card);transition:border-color var(--transition-normal), background var(--transition-normal), transform var(--transition-fast);cursor:pointer;flex-direction:column;align-items:center;height:100%;display:flex}.mode-card:hover{background:var(--bg-hover);transform:translateY(-3px)}.mode-card:active{transform:scale(.97)}.mode-card--logic{border-color:var(--section-logic-border)}.mode-card--logic:hover{border-color:#7c5cf680}.mode-card--karel{border-color:var(--section-karel-border)}.mode-card--karel:hover{border-color:#3b82f680}.mode-icon{width:64px;height:64px;margin-bottom:var(--sp-4);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:1.8rem;display:flex}.mode-icon--logic{background:#7c5cf61f}.mode-icon--karel{background:#3b82f61f}.mode-title{margin-bottom:var(--sp-2);font-size:1.25rem;font-weight:800}.mode-desc{color:var(--text-secondary);margin-bottom:var(--sp-5);flex:1;font-size:.88rem;line-height:1.5}.auth-banner{justify-content:space-between;align-items:center;gap:var(--sp-4);padding:var(--sp-4) var(--sp-5);border-radius:var(--radius-lg);background:#10b9810d;border:1px solid #10b98133;flex-wrap:wrap;display:flex}.auth-banner__icon{padding:var(--sp-2);background:#10b9811a;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;display:flex}.auth-banner__title{color:var(--text-primary);font-size:.95rem;font-weight:700}.auth-banner__text{color:var(--text-secondary);margin-top:2px;font-size:.82rem}.problem-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--sp-5);height:100%;transition:border-color var(--transition-normal), background var(--transition-normal);cursor:pointer;flex-direction:column;display:flex}.problem-card:hover{background:var(--bg-hover);border-color:#7c5cf64d}.problem-card:active{transform:scale(.985)}.problem-id-badge{color:var(--accent-primary);letter-spacing:.08em;text-transform:uppercase;margin-bottom:var(--sp-2);font-size:.7rem;font-weight:700}.problem-title{margin-bottom:var(--sp-3);font-size:1.05rem;font-weight:700;line-height:1.35}.problem-excerpt{color:var(--text-secondary);margin-bottom:var(--sp-4);-webkit-line-clamp:3;-webkit-box-orient:vertical;flex:1;font-size:.85rem;line-height:1.5;display:-webkit-box;overflow:hidden}.problem-footer{justify-content:space-between;align-items:center;margin-top:auto;display:flex}.live-badge{color:var(--accent-yellow);border-radius:var(--radius-full);background:#f59e0b1a;border:1px solid #f59e0b40;align-items:center;gap:3px;padding:2px 8px;font-size:.7rem;font-weight:700;display:inline-flex}.fav-btn{cursor:pointer;transition:transform var(--transition-fast);background:0 0;border:none;border-radius:50%;justify-content:center;align-items:center;padding:4px;display:flex}.fav-btn:hover{transform:scale(1.2)}.section-divider{align-items:center;gap:var(--sp-4);margin:var(--sp-8) 0 var(--sp-5);color:var(--text-muted);letter-spacing:.1em;text-transform:uppercase;font-size:.78rem;font-weight:700;display:flex}.section-divider:before,.section-divider:after{content:"";background:var(--border-color);flex:1;height:1px}.markdown-body ul,.markdown-body ol{margin-bottom:.75rem;padding-left:1.5rem;list-style:outside}.markdown-body p{margin-bottom:.75rem}.markdown-body li{margin-bottom:.35rem}@keyframes spin{to{transform:rotate(360deg)}}.spin{animation:.9s linear infinite spin}@media (width<=480px){.mode-card{padding:var(--sp-4)}.mode-icon{width:50px;height:50px;font-size:1.5rem}.mode-title{font-size:1.1rem}}@media (hover:none){.mode-card:hover{background:var(--bg-card);transform:none}.card-hover:hover,.problem-card:hover{background:var(--bg-card);border-color:var(--border-color)}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}.authors-section-container{background:var(--surface-color);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--sp-6) var(--sp-8);gap:var(--sp-8);flex-direction:column;max-width:1000px;margin:0 auto;display:flex;box-shadow:0 4px 30px #0003}.authors-container{gap:var(--sp-8);grid-template-columns:1fr auto 1fr auto 1fr;align-items:stretch;display:grid}.author-column{gap:var(--sp-5);flex-direction:column;display:flex}.author-header{align-items:center;gap:var(--sp-5);flex-wrap:wrap;display:flex}.author-avatar-container{width:100px;height:100px;transition:transform var(--transition-normal), box-shadow 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