:root{--bila-primary:#de7037;--bila-primary-dark:#c45e28;--bila-secondary:#059669;--bila-text:#363636;--bila-text-light:#666666;--bila-text-muted:#999999;--bila-bg:#ffffff;--bila-bg-alt:#faf8f5;--bila-border:#e5e5e5;--bila-radius:4px;--bila-shadow:0 1px 3px rgba(0,0,0,0.08);--bila-max-width:1200px;--bila-sidebar-width:300px}*,*::before,*::after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;text-size-adjust:100%}body{margin:0;font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:14px;line-height:1.6;color:var(--bila-text);background:var(--bila-bg)}a{color:var(--bila-primary);text-decoration:none}a:hover{color:var(--bila-primary-dark);text-decoration:underline}img{max-width:100%;height:auto}.site-container{max-width:var(--bila-max-width);margin:0 auto;padding:0 20px}.site-content{display:flex;gap:40px;padding:30px 0}.content-area{flex:1;min-width:0}.sidebar{width:var(--bila-sidebar-width);flex-shrink:0}.site-header{background:#2d3f3f;border-bottom:2px solid var(--bila-primary);position:sticky;top:0;z-index:100}.site-header .site-container{display:flex;align-items:center;justify-content:space-between;height:60px}.site-branding{display:flex;align-items:center;flex-shrink:0}.site-logo-link{display:block;line-height:0}.site-logo-link:hover{opacity:0.85}.site-logo{height:44px;width:auto}.main-navigation ul{list-style:none;margin:0;padding:0;display:flex;gap:0}.main-navigation a{display:block;padding:8px 14px;color:#d5d5d5;font-weight:500;font-size:0.8125rem;text-transform:uppercase;transition:color 0.2s}.main-navigation a:hover{color:var(--bila-primary);text-decoration:none}.main-navigation .current-menu-item>a{color:var(--bila-primary)}.main-navigation li{position:relative}.main-navigation ul ul{display:none;position:absolute;top:100%;left:0;background:#2d3f3f;border:1px solid #3d5050;border-radius:var(--bila-radius);box-shadow:0 4px 12px rgba(0,0,0,0.3);min-width:240px;flex-direction:column;padding:4px 0;z-index:200}.main-navigation li:hover>ul{display:flex}.main-navigation ul ul a{padding:6px 16px;font-size:0.8125rem;text-transform:none}.breadcrumbs{padding:12px 0;font-size:0.875rem;color:var(--bila-text-light)}.breadcrumbs a{color:var(--bila-text-light)}.breadcrumbs a:hover{color:var(--bila-primary);text-decoration:none}.breadcrumbs .separator{margin:0 6px}.hero{text-align:center;padding:40px 0 32px;background:var(--bila-bg-alt);border-bottom:1px solid var(--bila-border);margin:0 -20px;padding-left:20px;padding-right:20px}.hero__quote{margin:0 auto 20px;padding:0;border:none;font-style:italic;font-size:16px;line-height:1.6;color:var(--bila-text)}.hero__quote cite{display:block;margin-top:4px;font-style:normal;font-size:14px;color:var(--bila-text-muted)}.hero__title{font-size:28px;font-weight:600;margin:0 0 8px;color:var(--bila-text)}.hero__subtitle{font-size:15px;color:var(--bila-text-light);max-width:640px;margin:0 auto 24px;line-height:1.6}.hero .search-form{display:flex;align-items:stretch;max-width:560px;margin:0 auto}.hero .search-form label{flex:1;display:flex}.hero .search-field{width:100%;padding:10px 16px;border:2px solid var(--bila-border);border-right:none;border-radius:var(--bila-radius) 0 0 var(--bila-radius);font-size:14px;font-family:inherit;outline:none;transition:border-color 0.2s}.hero .search-field:focus{border-color:var(--bila-primary)}.hero .search-submit{padding:10px 24px;background:var(--bila-primary);color:#fff;border:2px solid var(--bila-primary);border-radius:0 var(--bila-radius) var(--bila-radius) 0;font-size:14px;font-weight:600;font-family:inherit;cursor:pointer;transition:background 0.2s;white-space:nowrap}.hero .search-submit:hover{background:var(--bila-primary-dark);border-color:var(--bila-primary-dark)}.materials-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}.material-card{background:var(--bila-bg);border:1px solid var(--bila-border);border-radius:var(--bila-radius);overflow:hidden;transition:box-shadow 0.2s}.material-card:hover{box-shadow:0 4px 12px rgba(0,0,0,0.1)}.material-card__image{aspect-ratio:16 / 9;overflow:hidden;background:var(--bila-bg-alt)}.material-card__image img{width:100%;height:100%;object-fit:cover}.material-card__body{padding:16px}.material-card__title{margin:0 0 8px;font-size:1.125rem;line-height:1.4}.material-card__title a{color:var(--bila-text)}.material-card__title a:hover{color:var(--bila-primary);text-decoration:none}.material-card__meta{display:flex;gap:12px;font-size:0.8125rem;color:var(--bila-text-light);margin-bottom:8px}.material-card__excerpt{font-size:0.9375rem;color:var(--bila-text-light);margin:0}.material-card__tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}.material-card__tag{display:inline-block;padding:2px 9px;background:var(--bila-primary);border-radius:2px;font-size:0.75rem;color:#fff;font-weight:600}a.material-card__tag{text-decoration:none;cursor:pointer;transition:background 0.2s}a.material-card__tag:hover{background:var(--bila-primary-dark);color:#fff}.material-single{max-width:800px}.material-single__header{margin-bottom:24px}.material-single__title{font-size:24px;font-weight:600;margin:0 0 12px;color:var(--bila-text)}.bila-font-size{display:flex;gap:8px;justify-content:flex-end;align-items:center;margin-bottom:16px}.bila-font-size__btn{display:inline-flex;align-items:center;justify-content:center;min-width:36px;height:36px;background:#fff;border:2px solid var(--bila-border);border-radius:var(--bila-radius);padding:0 10px;font-size:15px;font-family:inherit;font-weight:700;color:var(--bila-text);cursor:pointer;transition:all 0.2s;user-select:none}.bila-font-size__btn:hover{background:var(--bila-primary);color:#fff;border-color:var(--bila-primary)}.bila-font-size__btn:active{transform:scale(0.95)}.material-single__content{font-size:16px;line-height:1.9;color:#666;overflow-wrap:break-word;word-break:break-word}.material-single__content .katex{font-size:1em}.material-single__content .katex .sizing.reset-size3.size1,.material-single__content .katex .fontsize-ensurer.reset-size3.size1{font-size:0.85em !important}.material-single__content .katex .sizing.reset-size3.size2,.material-single__content .katex .fontsize-ensurer.reset-size3.size2{font-size:0.92em !important}.material-single__content .katex .sizing.reset-size6.size1,.material-single__content .katex .fontsize-ensurer.reset-size6.size1{font-size:0.65em !important}.material-single__content .katex .sizing.reset-size6.size2,.material-single__content .katex .fontsize-ensurer.reset-size6.size2{font-size:0.75em !important}.material-single__content .katex .sizing.reset-size6.size3,.material-single__content .katex .fontsize-ensurer.reset-size6.size3{font-size:0.85em !important}.material-single__content .katex-display{overflow-x:auto;overflow-y:hidden;padding:2px 0}.material-single__content h2{margin-top:2em}.material-single__content img{border-radius:var(--bila-radius);margin:1.5em 0;max-width:100% !important;height:auto !important}.material-single__content iframe{max-width:100%;width:100%;height:auto;aspect-ratio:16 / 9;border:0;border-radius:var(--bila-radius);margin:1em 0}.material-single__content table{width:100% !important;height:auto !important;border-collapse:collapse;margin:1em 0}.material-single__content td,.material-single__content th{padding:6px 10px;vertical-align:top}.material-single__content table:not([border="1"]) td{border-bottom:1px solid var(--bila-border)}.material-single__content table:not([border="1"]) tr:last-child td{border-bottom:none}.material-single__content table[border="1"] td,.material-single__content table[border="1"] th{border:1px solid var(--bila-border)}.bila-video{position:relative;padding-bottom:56.25%;height:0;margin:24px 0;border-radius:var(--bila-radius);overflow:hidden}.bila-video--hero{margin:0 0 24px}.bila-video iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0}.bila-download{margin:32px 0;padding:24px;border-radius:var(--bila-radius);text-align:center;border:1px solid var(--bila-border);background:var(--bila-bg-alt)}.bila-download--available{border-color:var(--bila-primary);border-left:4px solid var(--bila-primary)}.bila-download--locked{border-left:4px solid var(--bila-text-muted)}.bila-download--locked p{margin:0;color:var(--bila-text-light);font-size:0.9375rem}.bila-download--locked a{color:var(--bila-primary);font-weight:600}.bila-download--locked a:hover{color:var(--bila-primary-dark)}.bila-download__btn{display:inline-block;padding:12px 36px;background:var(--bila-primary);color:#fff !important;border-radius:var(--bila-radius);font-weight:600;font-size:1rem;transition:background 0.2s,box-shadow 0.2s;box-shadow:0 2px 4px rgba(222,112,55,0.3)}.bila-download__btn:hover{background:var(--bila-primary-dark);box-shadow:0 4px 8px rgba(222,112,55,0.4);text-decoration:none}.sidebar .widget{margin-bottom:24px;padding:20px;background:var(--bila-bg-alt);border-radius:var(--bila-radius)}.sidebar .widget-title{margin:0 0 12px;font-size:1rem;font-weight:600}.sidebar .widget ul{list-style:none;padding:0;margin:0}.sidebar .widget li{padding:6px 0;border-bottom:1px solid var(--bila-border)}.sidebar .widget li:last-child{border-bottom:0}.sidebar .widget li a{color:var(--bila-text);font-size:0.875rem}.sidebar .widget li a:hover{color:var(--bila-primary);text-decoration:none}.bila-filter{background:var(--bila-bg-alt);border-radius:var(--bila-radius);padding:20px}.bila-filter__title{margin:0 0 16px;font-size:16px;font-weight:600;color:var(--bila-text);text-transform:uppercase}.bila-filter__group{margin-bottom:14px}.bila-filter__label{display:block;font-size:12px;font-weight:600;color:var(--bila-text-muted);text-transform:uppercase;margin-bottom:4px}.bila-filter__search,.bila-filter__select{width:100%;padding:8px 10px;border:1px solid var(--bila-border);border-radius:var(--bila-radius);font-size:13px;font-family:inherit;background:#fff;color:var(--bila-text);outline:none;transition:border-color 0.2s}.bila-filter__search:focus,.bila-filter__select:focus{border-color:var(--bila-primary)}.bila-filter__btn{display:block;width:100%;padding:10px;background:var(--bila-primary);color:#fff;border:none;border-radius:var(--bila-radius);font-size:14px;font-weight:600;font-family:inherit;cursor:pointer;transition:background 0.2s;margin-top:4px}.bila-filter__btn:hover{background:var(--bila-primary-dark)}.bila-filter__reset{display:block;text-align:center;margin-top:10px;font-size:12px;color:var(--bila-text-muted)}.bila-filter__reset:hover{color:var(--bila-primary)}.category-header{margin-bottom:24px}.category-header__title{font-size:1.75rem;margin:0 0 8px}.category-header__description{color:var(--bila-text-light)}.subcategories-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;margin-bottom:32px}.subcategory-card{display:block;padding:16px;background:var(--bila-bg-alt);border:1px solid var(--bila-border);border-radius:var(--bila-radius);text-align:center;font-weight:500;color:var(--bila-text);transition:border-color 0.2s}.subcategory-card:hover{border-color:var(--bila-primary);text-decoration:none}.subcategory-card__count{display:block;font-size:0.8125rem;color:var(--bila-text-light);font-weight:400;margin-top:4px}.navigation.pagination{padding:32px 0}.navigation.pagination .screen-reader-text{display:none}.navigation.pagination .nav-links{display:flex;justify-content:center;gap:8px;flex-wrap:wrap}.navigation.pagination .page-numbers{display:inline-block;padding:8px 14px;border:1px solid var(--bila-border);border-radius:var(--bila-radius);font-size:0.9375rem;color:var(--bila-text)}.navigation.pagination .page-numbers:hover{border-color:var(--bila-primary);color:var(--bila-primary);text-decoration:none}.navigation.pagination .page-numbers.current{background:var(--bila-primary);color:#fff;border-color:var(--bila-primary)}.navigation.pagination .page-numbers.dots{border:none;padding:8px 4px}.front-section{margin-top:40px}.front-section__title{margin:0 0 16px;font-size:1.5rem;font-weight:600}.youtube-banner--sidebar{margin-top:20px}.youtube-banner__title{margin:0 0 10px;font-size:1rem;font-weight:600;color:var(--bila-primary)}.youtube-banner__link:hover .youtube-banner__title{color:var(--bila-primary-dark)}.youtube-banner__link{display:block;border-radius:var(--bila-radius);overflow:hidden;transition:box-shadow 0.2s}.youtube-banner__link:hover{box-shadow:0 4px 16px rgba(0,0,0,0.12);text-decoration:none}.youtube-banner__img{width:100%;height:auto;display:block;border-radius:var(--bila-radius)}.fb-page-banner{margin-top:20px}.fb-page-banner__title{margin:0 0 10px;font-size:1rem;font-weight:600;color:var(--bila-primary)}.fb-page-banner__iframe{display:block;width:100%;max-width:340px;height:214px;border:0;overflow:hidden;border-radius:var(--bila-radius);background:#f5f6f8}.site-footer{background:#333;border-top:none;padding:30px 0;margin-top:40px;font-size:0.8125rem;color:#999;text-align:center}.site-footer a{color:#d5d5d5}.site-footer a:hover{color:var(--bila-primary)}.site-footer .menu{list-style:none;padding:0;margin:12px 0 0;display:flex;justify-content:center;gap:16px;flex-wrap:wrap}.menu-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-shrink:0}.menu-toggle span{display:block;width:24px;height:2px;background:#fff;margin:5px 0;border-radius:1px;transition:transform 0.3s,opacity 0.3s}.menu-toggle.is-active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}.menu-toggle.is-active span:nth-child(2){opacity:0}.menu-toggle.is-active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}.post-navigation{margin-top:32px;padding-top:24px;border-top:1px solid var(--bila-border)}.post-navigation .screen-reader-text{display:none}.post-navigation .nav-links{display:flex;justify-content:space-between;gap:16px}.post-navigation .nav-previous,.post-navigation .nav-next{flex:1;min-width:0}.post-navigation .nav-next{text-align:right}.post-navigation a{display:block;padding:10px 20px;background:var(--bila-bg-alt);border:1px solid var(--bila-border);border-radius:var(--bila-radius);color:var(--bila-text);font-size:0.875rem;font-weight:500;transition:border-color 0.2s,background 0.2s}.post-navigation a:hover{border-color:var(--bila-primary);background:#fff;text-decoration:none;color:var(--bila-primary)}.post-navigation .nav-label{display:block;font-size:0.75rem;font-weight:600;color:var(--bila-text-muted);margin-bottom:2px}.post-navigation .nav-title{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.user-area{display:flex;align-items:center;gap:12px;flex-shrink:0;margin-left:16px}.user-area__login{color:#d5d5d5;font-size:0.8125rem;font-weight:500;padding:6px 12px;transition:color 0.2s}.user-area__login:hover{color:var(--bila-primary);text-decoration:none}.user-area__register{display:inline-block;padding:6px 16px;background:var(--bila-primary);color:#fff;border-radius:var(--bila-radius);font-size:0.8125rem;font-weight:600;transition:background 0.2s}.user-area__register:hover{background:var(--bila-primary-dark);color:#fff;text-decoration:none}.user-area__dropdown{position:relative}.user-area__toggle{display:flex;align-items:center;gap:4px;background:none;border:none;color:#d5d5d5;font-size:0.8125rem;font-weight:500;cursor:pointer;padding:6px 10px;font-family:inherit;transition:color 0.2s}.user-area__toggle:hover{color:var(--bila-primary)}.user-area__arrow{font-size:0.625rem;transition:transform 0.2s}.user-area__toggle[aria-expanded="true"] .user-area__arrow{transform:rotate(180deg)}.user-area__menu{display:none;position:absolute;top:100%;right:0;background:#2d3f3f;border:1px solid #3d5050;border-radius:var(--bila-radius);box-shadow:0 4px 12px rgba(0,0,0,0.3);min-width:160px;padding:4px 0;z-index:200}.user-area__menu.is-open{display:block}.user-area__menu a{display:block;padding:8px 16px;color:#d5d5d5;font-size:0.8125rem;transition:background 0.2s,color 0.2s}.user-area__menu a:hover{background:#3d5050;color:var(--bila-primary);text-decoration:none}.bila-auth{display:flex;justify-content:center;padding:20px 0}.bila-auth__card{width:100%;max-width:420px;background:var(--bila-bg);border:1px solid var(--bila-border);border-radius:var(--bila-radius);padding:32px}.bila-auth__card--wide{max-width:700px}.bila-auth__title{margin:0 0 20px;font-size:1.5rem;font-weight:600;color:var(--bila-text);text-align:center}.bila-auth__description{color:var(--bila-text-light);font-size:0.9375rem;text-align:center;margin-bottom:20px}.bila-auth__message{padding:10px 14px;border-radius:var(--bila-radius);font-size:0.875rem;margin-bottom:16px}.bila-auth__message--error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}.bila-auth__message--success{background:#f0fdf4;color:#166534;border:1px solid #bbf7d0}.bila-auth__message--info{background:#eff6ff;color:#1e40af;border:1px solid #bfdbfe}.bila-auth__field{margin-bottom:16px}.bila-auth__field label{display:block;font-size:0.875rem;font-weight:600;color:var(--bila-text);margin-bottom:4px}.bila-auth__field label .required{color:#dc2626}.bila-auth__field input[type="text"],.bila-auth__field input[type="email"],.bila-auth__field input[type="password"],.bila-auth__field input[type="tel"]{width:100%;padding:10px 12px;border:1px solid var(--bila-border);border-radius:var(--bila-radius);font-size:14px;font-family:inherit;color:var(--bila-text);outline:none;transition:border-color 0.2s}.bila-auth__field input:focus{border-color:var(--bila-primary)}.bila-auth__field--checkbox{display:flex;align-items:center}.bila-auth__field--checkbox label{display:flex;align-items:center;gap:6px;font-weight:400;font-size:0.875rem;cursor:pointer}.bila-auth__btn{display:block;width:100%;padding:12px;background:var(--bila-primary);color:#fff;border:none;border-radius:var(--bila-radius);font-size:1rem;font-weight:600;font-family:inherit;cursor:pointer;text-align:center;transition:background 0.2s;text-decoration:none}.bila-auth__btn:hover{background:var(--bila-primary-dark);color:#fff;text-decoration:none}.bila-auth__btn--danger{background:#dc2626}.bila-auth__btn--danger:hover{background:#b91c1c}.bila-auth__links{display:flex;justify-content:space-between;margin-top:16px;font-size:0.875rem}.bila-auth__links a{color:var(--bila-text-light)}.bila-auth__links a:hover{color:var(--bila-primary)}.bila-account__tabs{display:flex;gap:0;border-bottom:2px solid var(--bila-border);margin-bottom:24px}.bila-account__tab{padding:10px 20px;font-size:0.9375rem;font-weight:500;color:var(--bila-text-light);border-bottom:2px solid transparent;margin-bottom:-2px;transition:color 0.2s,border-color 0.2s}.bila-account__tab:hover{color:var(--bila-primary);text-decoration:none}.bila-account__tab.is-active{color:var(--bila-primary);border-bottom-color:var(--bila-primary);font-weight:600}.bila-account__section{margin-bottom:32px}.bila-account__section h3{margin:0 0 16px;font-size:1.125rem;font-weight:600}.bila-account__sub-status{padding:16px;border-radius:var(--bila-radius);border:1px solid var(--bila-border)}.bila-account__sub-status p{margin:8px 0 0;font-size:0.9375rem;color:var(--bila-text-light)}.bila-account__sub-status--active{background:#f0fdf4;border-color:#bbf7d0}.bila-account__sub-status--inactive{background:#fef2f2;border-color:#fecaca}.bila-account__sub-badge{display:inline-block;padding:3px 10px;border-radius:12px;font-size:0.75rem;font-weight:700;text-transform:uppercase;letter-spacing:0.5px}.bila-account__sub-status--active .bila-account__sub-badge{background:#166534;color:#fff}.bila-account__sub-status--inactive .bila-account__sub-badge{background:#991b1b;color:#fff}.bila-account__danger{padding:20px;border:1px solid #fecaca;border-radius:var(--bila-radius);background:#fef2f2}.bila-account__danger h3{color:#991b1b}.bila-account__danger p{color:#991b1b;font-size:0.875rem}.bila-subscription-info__lead{font-size:1rem;color:var(--bila-text-light);text-align:center;line-height:1.6;margin-bottom:24px}.bila-subscription-info__plans{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:24px}.bila-subscription-info__plan{padding:24px;border:1px solid var(--bila-border);border-radius:var(--bila-radius);text-align:center}.bila-subscription-info__plan h3{margin:0 0 12px;font-size:1.125rem}.bila-subscription-info__plan ul{list-style:none;padding:0;margin:16px 0 0;text-align:left}.bila-subscription-info__plan li{padding:4px 0;font-size:0.875rem;color:var(--bila-text-light)}.bila-subscription-info__plan li::before{content:"\2713 ";color:var(--bila-secondary);font-weight:700}.bila-subscription-info__plan--featured{border-color:var(--bila-primary);border-width:2px;position:relative}.bila-subscription-info__price{margin-bottom:4px}.bila-subscription-info__amount{font-size:2rem;font-weight:700;color:var(--bila-primary)}.bila-subscription-info__period{font-size:0.875rem;color:var(--bila-text-muted)}.bila-subscription-info__note{text-align:center;color:var(--bila-text-muted);font-size:0.875rem;font-style:italic;margin-bottom:16px}.bila-contact-section{max-width:700px}.front-section__subtitle{color:var(--bila-text-light);font-size:0.9375rem;margin:0 0 20px}.bila-contact__row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.bila-auth__field textarea{width:100%;padding:10px 12px;border:1px solid var(--bila-border);border-radius:var(--bila-radius);font-size:14px;font-family:inherit;color:var(--bila-text);outline:none;transition:border-color 0.2s;resize:vertical}.bila-auth__field 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var(--bila-radius);font-size:16px;outline:none;transition:border-color 0.2s}.error-404__search .search-field:focus{border-color:var(--bila-primary)}.error-404__search .search-submit{padding:14px 32px;background:var(--bila-primary);color:#fff;border:2px solid var(--bila-primary);border-radius:0 var(--bila-radius) var(--bila-radius) 0;font-size:16px;cursor:pointer;transition:background 0.2s}.error-404__search .search-submit:hover{background:var(--bila-primary-dark);border-color:var(--bila-primary-dark)}.error-404__home{display:inline-block;padding:14px 36px;background:var(--bila-bg);color:var(--bila-primary);border:2px solid var(--bila-primary);border-radius:var(--bila-radius);font-size:16px;font-weight:600;text-decoration:none;transition:background 0.2s,color 0.2s}.error-404__home:hover{background:var(--bila-primary);color:#fff}@media (max-width:768px){.menu-toggle{display:block}.site-header .site-container{flex-wrap:wrap;height:auto;padding:12px 16px}.site-branding{flex:1;min-width:0}.user-area{margin-left:auto;margin-right:12px;order:2}.main-navigation{display:none;width:100%;order:3;border-top:1px solid #3d5050;margin-top:8px;padding-top:4px}.main-navigation.is-open{display:block}.main-navigation ul{flex-direction:column}.main-navigation li{border-bottom:1px solid #3d5050}.main-navigation li:last-child{border-bottom:none}.main-navigation a{padding:10px 0}.main-navigation ul ul{display:none;position:static;box-shadow:none;border:none;border-radius:0;min-width:0;padding:0 0 0 16px;background:#253535}.main-navigation ul ul.is-open{display:flex}.main-navigation .menu-item-has-children>a::after{content:"▾";margin-left:6px;font-size:10px}.main-navigation .submenu-open>a::after{content:"▴"}.main-navigation li:hover>ul{display:none}.main-navigation li:hover>ul.is-open{display:flex}.site-content{flex-direction:column;gap:24px;padding:20px 0}.sidebar{width:100%}.hero{padding:28px 16px 24px;margin:0 -16px}.hero__title{font-size:22px}.hero__subtitle{font-size:14px;margin-bottom:20px}.hero .search-form{flex-direction:column;gap:8px}.hero .search-field{border-right:2px solid var(--bila-border);border-radius:var(--bila-radius)}.hero .search-field:focus{border-color:var(--bila-primary)}.hero .search-submit{border-radius:var(--bila-radius)}.materials-grid{grid-template-columns:1fr;gap:16px}.subcategories-grid{grid-template-columns:repeat(2,1fr);gap:12px}.material-single__title{font-size:1.375rem}.material-single__content{overflow-x:auto}.bila-contact__row{grid-template-columns:1fr}.front-section{margin-top:28px}.front-section__title{font-size:1.25rem}.bila-video{margin:16px -16px;border-radius:0}.breadcrumbs{padding:8px 0;font-size:0.8125rem}.category-header__title{font-size:1.375rem}.navigation.pagination{padding:24px 0}.post-navigation .nav-links{flex-direction:column}.post-navigation .nav-next{text-align:left}.site-footer{padding:20px 0;margin-top:24px}.site-footer .menu{flex-direction:column;gap:8px}.bila-auth__card{padding:24px 20px}.bila-auth__title{font-size:1.25rem}.bila-account__tabs{gap:0}.bila-account__tab{padding:8px 14px;font-size:0.8125rem}.bila-subscription-info__plans{grid-template-columns:1fr}.error-404{padding:40px 16px 60px}.error-404__icon svg{width:96px;height:96px}.error-404__code{font-size:110px}.error-404__title{font-size:26px}.error-404__text{font-size:15px}.error-404__search .search-form{flex-direction:column;gap:8px}.error-404__search .search-field{border-right:2px solid var(--bila-border);border-radius:var(--bila-radius)}.error-404__search .search-field:focus{border-color:var(--bila-primary)}.error-404__search .search-submit{border-radius:var(--bila-radius)}.site-container{padding:0 16px}}@media (max-width:480px){.subcategories-grid{grid-template-columns:1fr}.site-logo{height:32px}.hero__title{font-size:20px}.hero__subtitle{font-size:13px}.breadcrumbs{font-size:0.75rem}.material-card__body{padding:12px}.material-card__title{font-size:1rem}.subcategory-card{padding:12px;font-size:0.875rem}.navigation.pagination .page-numbers{padding:6px 10px;font-size:0.8125rem}.bila-filter{padding:16px}.bila-filter__title{font-size:14px}.user-area{gap:6px}.user-area__login,.user-area__register{font-size:0.75rem;padding:4px 8px}.user-area__toggle{font-size:0.75rem}.bila-auth__card{padding:20px 16px}.bila-auth__links{flex-direction:column;gap:8px;text-align:center}.bila-account__tabs{overflow-x:auto;-webkit-overflow-scrolling:touch}.bila-account__tab{padding:8px 10px;font-size:0.75rem;white-space:nowrap}.error-404__icon svg{width:80px;height:80px}.error-404__code{font-size:80px}.error-404__title{font-size:22px}.error-404__text{font-size:14px}}