:root{--primary:#2563eb;--primary-dark:#1d4ed8;--primary-light:#dbeafe;--secondary:#0f172a;--accent:#f59e0b;--accent-light:#fef3c7;--success:#10b981;--text-primary:#1e293b;--text-secondary:#64748b;--text-muted:#94a3b8;--bg-page:#f8fafc;--bg-white:#ffffff;--bg-light:#f1f5f9;--border:#e2e8f0;--border-hover:#cbd5e1;--shadow-sm:0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);--shadow-md:0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);--shadow-lg:0 10px 25px rgba(0,0,0,.1), 0 4px 10px rgba(0,0,0,.07);--shadow-xl:0 20px 40px rgba(0,0,0,.12);--radius-sm:6px;--radius-md:12px;--radius-lg:20px;--radius-xl:28px;--font-sans:'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;--transition:all .22s cubic-bezier(.4,0,.2,1)}*,*::before,*::after{box-sizing:border-box}body.lang-theme{background:var(--bg-page);color:var(--text-primary);font-family:var(--font-sans);line-height:1.7}body.lang-theme a{color:var(--primary);text-decoration:none;transition:var(--transition)}body.lang-theme a:hover{color:var(--primary-dark)}body.lang-theme img{max-width:100%;height:auto;display:block}.lt-container{max-width:1200px;margin:0 auto;padding:0 24px}.lt-section{padding:64px 0}.lt-section--sm{padding:40px 0}.lt-heading-xl{font-size:clamp(2rem, 5vw, 3.5rem);font-weight:800;line-height:1.15;letter-spacing:-.03em;color:var(--secondary)}.lt-heading-lg{font-size:clamp(1.5rem, 3vw, 2.25rem);font-weight:700;line-height:1.25;letter-spacing:-.02em;color:var(--secondary)}.lt-heading-md{font-size:1.35rem;font-weight:700;line-height:1.3;color:var(--secondary)}.lt-text-lead{font-size:1.15rem;color:var(--text-secondary);line-height:1.75}.lt-badge{display:inline-flex;align-items:center;gap:6px;padding:5px 14px;border-radius:100px;font-size:.78rem;font-weight:600;letter-spacing:.04em;text-transform:uppercase}.lt-badge--primary{background:var(--primary-light);color:var(--primary-dark)}.lt-badge--accent{background:var(--accent-light);color:#92400e}.lt-badge--success{background:#d1fae5;color:#065f46}.lt-badge--gray{background:var(--bg-light);color:var(--text-secondary)}.lt-btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;border-radius:var(--radius-md);font-size:.95rem;font-weight:600;cursor:pointer;transition:var(--transition);border:2px solid #fff0;text-decoration:none!important}.lt-btn--primary{background:var(--primary);color:#fff!important;border-color:var(--primary)}.lt-btn--primary:hover{background:var(--primary-dark);border-color:var(--primary-dark);transform:translateY(-1px);box-shadow:0 8px 20px rgb(37 99 235 / .35);color:#fff!important}.lt-btn--outline{background:#fff0;color:var(--primary)!important;border-color:var(--primary)}.lt-btn--outline:hover{background:var(--primary);color:#fff!important}.lt-btn--lg{padding:15px 32px;font-size:1rem;border-radius:var(--radius-lg)}.lt-card{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;transition:var(--transition);box-shadow:var(--shadow-sm)}.lt-card:hover{border-color:var(--primary);box-shadow:var(--shadow-lg);transform:translateY(-3px)}.lt-section-header{text-align:center;margin-bottom:48px}.lt-section-header .lt-badge{margin-bottom:16px}.lt-section-header .lt-heading-lg{margin-bottom:12px}.lt-divider{width:60px;height:4px;background:linear-gradient(90deg,var(--primary),var(--accent));border-radius:2px;margin:16px auto 0}.lt-hero{background:linear-gradient(135deg,#0f172a 0%,#1e3a8a 50%,#1e40af 100%);padding:100px 0 80px;position:relative;overflow:hidden}.lt-hero::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse 80% 80% at 20% 40%,rgb(59 130 246 / .25) 0%,transparent 60%),radial-gradient(ellipse 50% 50% at 80% 20%,rgb(245 158 11 / .15) 0%,transparent 50%);pointer-events:none}.lt-hero__inner{position:relative;z-index:1;max-width:700px}.lt-hero .lt-badge{background:rgb(255 255 255 / .12);color:rgb(255 255 255 / .9);border:1px solid rgb(255 255 255 / .2);margin-bottom:20px}.lt-hero .lt-heading-xl{color:#fff;margin-bottom:20px}.lt-hero .lt-text-lead{color:rgb(255 255 255 / .75);margin-bottom:36px}.lt-hero__actions{display:flex;gap:14px;flex-wrap:wrap}.lt-hero__stats{display:flex;gap:32px;flex-wrap:wrap;margin-top:56px;padding-top:32px;border-top:1px solid rgb(255 255 255 / .15)}.lt-hero__stat-num{font-size:1.75rem;font-weight:800;color:#fff;line-height:1}.lt-hero__stat-label{font-size:.82rem;color:rgb(255 255 255 / .6);margin-top:4px;text-transform:uppercase;letter-spacing:.06em}.lt-languages-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}.lt-lang-card{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px;display:flex;flex-direction:column;gap:14px;transition:var(--transition);box-shadow:var(--shadow-sm);cursor:pointer;text-decoration:none!important;color:inherit!important}.lt-lang-card:hover{border-color:var(--primary);box-shadow:var(--shadow-lg);transform:translateY(-4px)}.lt-lang-card__icon{width:56px;height:56px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:1.6rem;flex-shrink:0;background:var(--primary-light)}.lt-lang-card__name{font-size:1.1rem;font-weight:700;color:var(--secondary)}.lt-lang-card__meta{display:flex;align-items:center;gap:8px;font-size:.82rem;color:var(--text-muted)}.lt-lang-card__meta-dot{width:3px;height:3px;background:var(--border);border-radius:50%}.lt-lang-card__footer{margin-top:auto;padding-top:14px;border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.lt-lang-card__sub-count{font-size:.8rem;color:var(--text-secondary)}.lt-lang-card__arrow{width:30px;height:30px;background:var(--primary-light);color:var(--primary);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.9rem;transition:var(--transition)}.lt-lang-card:hover .lt-lang-card__arrow{background:var(--primary);color:#fff}.lt-cat-hero{background:linear-gradient(135deg,#0f172a 0%,#1e3a8a 100%);padding:60px 0;color:#fff}.lt-cat-hero__inner{display:flex;align-items:center;gap:32px}.lt-cat-hero__icon-wrap{width:90px;height:90px;background:rgb(255 255 255 / .1);border:2px solid rgb(255 255 255 / .2);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;font-size:2.5rem;flex-shrink:0}.lt-cat-hero__title{font-size:clamp(1.6rem, 4vw, 2.5rem);font-weight:800;color:#fff;margin-bottom:8px;line-height:1.2}.lt-cat-hero__desc{color:rgb(255 255 255 / .7);font-size:.95rem;max-width:600px;margin-bottom:16px}.lt-cat-hero__stats{display:flex;gap:20px;flex-wrap:wrap}.lt-cat-hero__stat{display:flex;align-items:center;gap:6px;background:rgb(255 255 255 / .1);border-radius:100px;padding:5px 14px;font-size:.82rem;color:rgb(255 255 255 / .85)}.lt-subcats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}.lt-subcat-card{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-md);padding:20px;display:flex;align-items:center;gap:14px;transition:var(--transition);text-decoration:none!important;color:inherit!important;box-shadow:var(--shadow-sm)}.lt-subcat-card:hover{border-color:var(--primary);box-shadow:var(--shadow-md);transform:translateX(3px)}.lt-subcat-card__icon{width:44px;height:44px;background:var(--primary-light);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:1.2rem;flex-shrink:0;color:var(--primary)}.lt-subcat-card__name{font-weight:600;font-size:.92rem;color:var(--secondary)}.lt-subcat-card__count{font-size:.78rem;color:var(--text-muted);margin-top:2px}.lt-posts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}.lt-post-card{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;transition:var(--transition);box-shadow:var(--shadow-sm);display:flex;flex-direction:column}.lt-post-card:hover{border-color:var(--primary);box-shadow:var(--shadow-lg);transform:translateY(-3px)}.lt-post-card__thumb{aspect-ratio:16/9;overflow:hidden;background:var(--bg-light);position:relative}.lt-post-card__thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}.lt-post-card:hover .lt-post-card__thumb img{transform:scale(1.04)}.lt-post-card__thumb-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:2.5rem;color:var(--border);background:linear-gradient(135deg,var(--bg-light) 0%,var(--border) 100%)}.lt-post-card__body{padding:20px;flex:1;display:flex;flex-direction:column}.lt-post-card__cats{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px}.lt-post-card__title{font-size:1rem;font-weight:700;color:var(--secondary);line-height:1.4;margin-bottom:8px;flex:1}.lt-post-card__title a{color:inherit!important;text-decoration:none!important}.lt-post-card__title a:hover{color:var(--primary)!important}.lt-post-card__excerpt{font-size:.85rem;color:var(--text-secondary);line-height:1.6;margin-bottom:16px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.lt-post-card__footer{display:flex;align-items:center;justify-content:space-between;padding-top:14px;border-top:1px solid var(--border)}.lt-post-card__date{font-size:.78rem;color:var(--text-muted);display:flex;align-items:center;gap:5px}.lt-post-card__read-more{font-size:.82rem;font-weight:600;color:var(--primary)!important;display:flex;align-items:center;gap:4px;text-decoration:none!important}.lt-pagination{display:flex;justify-content:center;align-items:center;gap:8px;margin-top:48px;flex-wrap:wrap}.lt-pagination a,.lt-pagination span{min-width:40px;height:40px;padding:0 14px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);font-size:.9rem;font-weight:600;border:1px solid var(--border);background:var(--bg-white);color:var(--text-secondary);text-decoration:none;transition:var(--transition)}.lt-pagination a:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-light)}.lt-pagination .current,.lt-pagination span.current{background:var(--primary);border-color:var(--primary);color:#fff}.lt-single-wrap{display:grid;grid-template-columns:1fr 340px;gap:32px;align-items:start;max-width:1200px;margin:0 auto;padding:40px 24px}.lt-lesson-header{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;margin-bottom:24px;box-shadow:var(--shadow-sm)}.lt-lesson-header__image{aspect-ratio:21/9;overflow:hidden;background:linear-gradient(135deg,#1e3a8a,#3b82f6);position:relative}.lt-lesson-header__image img{width:100%;height:100%;object-fit:cover}.lt-lesson-header__image-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:4rem;color:rgb(255 255 255 / .3)}.lt-lesson-header__body{padding:32px}.lt-lesson-header__meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:16px}.lt-lesson-header__title{font-size:clamp(1.4rem, 3vw, 2rem);font-weight:800;color:var(--secondary);line-height:1.3;margin-bottom:14px}.lt-lesson-header__info-bar{display:flex;align-items:center;gap:20px;padding-top:16px;border-top:1px solid var(--border);flex-wrap:wrap}.lt-lesson-header__info-item{display:flex;align-items:center;gap:6px;font-size:.82rem;color:var(--text-muted)}.lt-breadcrumb{display:flex;align-items:center;gap:6px;padding:14px 0;margin-bottom:8px;flex-wrap:wrap}.lt-breadcrumb a,.lt-breadcrumb span{font-size:.82rem;color:var(--text-muted);text-decoration:none}.lt-breadcrumb a:hover{color:var(--primary)}.lt-breadcrumb__sep{color:var(--border);font-size:.7rem}.lt-breadcrumb__current{font-size:.82rem;color:var(--text-secondary);font-weight:500;max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lt-lesson-content{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-lg);padding:36px;box-shadow:var(--shadow-sm);margin-bottom:24px;font-size:1rem;line-height:1.85;color:var(--text-primary)}.lt-lesson-content h2{font-size:1.45rem;font-weight:700;color:var(--secondary);margin:32px 0 14px;padding-bottom:10px;border-bottom:2px solid var(--border)}.lt-lesson-content h3{font-size:1.2rem;font-weight:700;color:var(--secondary);margin:24px 0 10px}.lt-lesson-content p{margin-bottom:18px}.lt-lesson-content table{width:100%;border-collapse:collapse;margin:24px 0;font-size:.9rem;border-radius:var(--radius-md);overflow:hidden;border:1px solid var(--border)}.lt-lesson-content table th{background:var(--primary);color:#fff;padding:12px 16px;font-weight:600;text-align:left}.lt-lesson-content table td{padding:10px 16px;border-bottom:1px solid var(--border)}.lt-lesson-content table tr:last-child td{border-bottom:none}.lt-lesson-content table tr:nth-child(even) td{background:var(--bg-light)}.lt-lesson-content ul,.lt-lesson-content ol{padding-left:24px;margin-bottom:18px}.lt-lesson-content li{margin-bottom:6px}.lt-lesson-content blockquote{border-left:4px solid var(--primary);background:var(--primary-light);padding:16px 20px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin:24px 0;color:var(--primary-dark);font-style:italic}.lt-lesson-content code{background:var(--bg-light);border:1px solid var(--border);padding:2px 8px;border-radius:4px;font-family:'Fira Code',monospace;font-size:.88em;color:var(--primary-dark)}.lt-lesson-tags{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;margin-bottom:24px;box-shadow:var(--shadow-sm)}.lt-lesson-tags__title{font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);margin-bottom:12px}.lt-lesson-tags__list{display:flex;flex-wrap:wrap;gap:8px}.lt-lesson-tags__tag{padding:5px 12px;border-radius:100px;background:var(--bg-light);border:1px solid var(--border);font-size:.8rem;color:var(--text-secondary);text-decoration:none;transition:var(--transition);font-weight:500}.lt-lesson-tags__tag:hover{background:var(--primary-light);border-color:var(--primary);color:var(--primary)!important}.lt-lesson-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:24px}.lt-lesson-nav__item{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-md);padding:18px;text-decoration:none!important;color:inherit!important;transition:var(--transition);box-shadow:var(--shadow-sm)}.lt-lesson-nav__item:hover{border-color:var(--primary);box-shadow:var(--shadow-md)}.lt-lesson-nav__label{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);font-weight:600;margin-bottom:6px;display:flex;align-items:center;gap:5px}.lt-lesson-nav__title{font-size:.88rem;font-weight:600;color:var(--secondary);line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.lt-lesson-nav__item--next{text-align:right}.lt-lesson-nav__item--next .lt-lesson-nav__label{justify-content:flex-end}.lt-sidebar{display:flex;flex-direction:column;gap:20px;position:sticky;top:24px}.lt-widget{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-sm)}.lt-widget__header{padding:16px 20px;border-bottom:1px solid var(--border);background:var(--bg-light)}.lt-widget__title{font-size:.85rem;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--text-secondary);display:flex;align-items:center;gap:8px}.lt-widget__body{padding:16px 20px}.lt-related-list{display:flex;flex-direction:column;gap:12px}.lt-related-item{display:flex;gap:12px;text-decoration:none!important;color:inherit!important;transition:var(--transition);padding:8px;border-radius:var(--radius-sm);margin:0 -8px}.lt-related-item:hover{background:var(--bg-light)}.lt-related-item__thumb{width:64px;height:64px;border-radius:var(--radius-sm);overflow:hidden;flex-shrink:0;background:var(--bg-light)}.lt-related-item__thumb 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var(--border);text-decoration:none!important;color:var(--text-primary)!important;font-size:.88rem;transition:var(--transition)}.lt-sidebar-cat-item:last-child{border-bottom:none}.lt-sidebar-cat-item:hover{color:var(--primary)!important;padding-left:6px}.lt-sidebar-cat-item__count{font-size:.75rem;color:var(--text-muted);background:var(--bg-light);border-radius:100px;padding:2px 8px}.lt-empty-state{text-align:center;padding:60px 24px;color:var(--text-muted)}.lt-empty-state__icon{font-size:3rem;margin-bottom:16px;opacity:.5}.lt-load-more{text-align:center;margin-top:40px}@media (max-width:960px){.lt-single-wrap{grid-template-columns:1fr}.lt-sidebar{position:static}.lt-lesson-nav{grid-template-columns:1fr}}@media (max-width:768px){.lt-section{padding:40px 0}.lt-hero{padding:60px 0 50px}.lt-cat-hero{padding:40px 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