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#0000004d}.back-to-top.visible{opacity:1;visibility:visible;transform:translateY(0)}.back-to-top:hover{background:linear-gradient(135deg,var(--accent-red),var(--accent-purple));border-color:transparent;transform:translateY(-5px)}@media(max-width:768px){.back-to-top{bottom:1rem;right:1rem;width:40px;height:40px;font-size:1rem}}.promo-banner{position:relative;margin:0 auto;max-width:var(--max-width);padding:0 1.5rem}.promo-banner-inner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:1.5rem;padding:1rem 1.5rem 1rem 1.25rem;border-radius:var(--radius-xl);border:1px solid rgba(255,42,95,.2);background:linear-gradient(135deg,#ff2a5f14,#8c3fff14,#00e5ff0d);backdrop-filter:blur(24px);box-shadow:0 8px 32px #ff2a5f1f,0 2px 8px #0000004d,inset 0 1px #ffffff0f;overflow:hidden;animation:promoBannerSlideIn .6s cubic-bezier(.175,.885,.32,1.275) both}.promo-banner-inner:after{content:"";position:absolute;top:0;left:-100%;width:50%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.06),transparent);animation:promoShimmer 4s ease-in-out infinite;pointer-events:none}.promo-banner-glow{position:absolute;top:50%;left:30%;transform:translate(-50%,-50%);width:400px;height:200px;background:radial-gradient(ellipse,rgba(255,42,95,.15) 0%,rgba(140,63,255,.1) 50%,transparent 80%);filter:blur(60px);pointer-events:none;animation:promoGlowPulse 3s ease-in-out infinite alternate}.promo-banner-content{display:flex;align-items:center;gap:1rem;flex:1;min-width:0}.promo-banner-icon-wrap{position:relative;flex-shrink:0}.promo-banner-icon{width:48px;height:48px;border-radius:var(--radius-md);box-shadow:0 4px 12px #0006;border:2px solid rgba(255,255,255,.1)}.promo-banner-badge{position:absolute;bottom:-4px;right:-6px;background:linear-gradient(135deg,var(--accent-red),var(--accent-purple));color:#fff;font-size:.55rem;font-weight:800;padding:.15rem .35rem;border-radius:4px;letter-spacing:.05em;box-shadow:0 2px 6px #ff2a5f66;line-height:1}.promo-banner-text{display:flex;flex-direction:column;gap:.15rem;min-width:0}.promo-banner-title{font-size:.95rem;font-weight:800;color:var(--text-white);letter-spacing:-.01em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.promo-banner-subtitle{font-size:.78rem;color:var(--text-muted);line-height:1.3;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.promo-banner-actions{display:flex;align-items:center;gap:1rem;flex-shrink:0}.promo-btn-download{font-size:.85rem!important;padding:.6rem 1.5rem!important;white-space:nowrap;box-shadow:0 6px 20px #ef44444d}.promo-btn-download:after{display:none}.promo-btn-icon{font-size:.9em;margin-right:.15rem}.promo-btn-details{font-size:.8rem;font-weight:600;color:var(--text-muted);text-decoration:none;white-space:nowrap;transition:color var(--transition)}.promo-btn-details:hover{color:var(--accent-blue)}.promo-banner-close{position:absolute;top:50%;right:2.25rem;transform:translateY(-50%);background:#ffffff0f;border:1px solid rgba(255,255,255,.08);color:var(--text-dim);width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:.7rem;transition:all var(--transition);z-index:2}.promo-banner-close:hover{background:#ffffff1f;color:var(--text-white);border-color:#fff3;transform:translateY(-50%) scale(1.1)}@keyframes promoBannerSlideIn{0%{opacity:0;transform:translateY(-12px)}to{opacity:1;transform:translateY(0)}}@keyframes promoShimmer{0%,to{left:-100%}50%{left:150%}}@keyframes promoGlowPulse{0%{opacity:.5;transform:translate(-50%,-50%) scale(1)}to{opacity:.8;transform:translate(-50%,-50%) scale(1.2)}}.promo-banner-hiding .promo-banner-inner{animation:promoBannerSlideOut .4s cubic-bezier(.6,-.28,.74,.05) forwards}@keyframes promoBannerSlideOut{to{opacity:0;transform:translateY(-20px) scale(.98)}}@media(max-width:768px){.promo-banner-inner{flex-direction:column;align-items:flex-start;gap:1rem;padding:1.25rem 2.5rem 1.25rem 1.25rem}.promo-banner-close{top:.75rem;right:1rem;transform:none}.promo-banner-close:hover{transform:scale(1.1)}.promo-banner-subtitle,.promo-banner-title{white-space:normal}.promo-banner-actions{width:100%}.promo-btn-download{flex:1;text-align:center;justify-content:center}}@media(max-width:480px){.promo-banner-icon{width:40px;height:40px}.promo-banner-title{font-size:.88rem}.promo-banner-subtitle{font-size:.72rem}}.footer-author{margin-top:1.5rem;padding-top:1.5rem;border-top:1px solid var(--border-card)}.footer-author p{font-size:.82rem;color:var(--text-muted);line-height:1.6;max-width:800px}.lang-switcher{position:relative;margin-left:.5rem}.lang-toggle{background:none;border:1px solid var(--border-card);color:var(--text-white);cursor:pointer;padding:.4rem .6rem;border-radius:var(--radius-sm);font-size:1.1rem;transition:all var(--transition);display:flex;align-items:center}.lang-toggle:hover{background:var(--bg-tertiary);border-color:#ffffff26}.lang-dropdown{display:none;position:absolute;top:calc(100% + .5rem);right:0;min-width:160px;background:var(--bg-secondary);border:1px solid var(--border-card);border-radius:var(--radius-md);padding:.4rem;box-shadow:0 10px 30px #00000080;z-index:200;backdrop-filter:blur(20px)}.lang-dropdown.open{display:flex;flex-direction:column}.lang-dropdown a{padding:.5rem .75rem;color:var(--text-muted);text-decoration:none;font-size:.85rem;border-radius:var(--radius-sm);transition:all var(--transition);white-space:nowrap}.lang-dropdown a:hover{color:var(--text-white);background:var(--bg-tertiary)}.lang-dropdown a.lang-active{color:var(--accent-blue);font-weight:600}.lang-mobile-section{border-top:1px solid var(--border-subtle);padding-top:.75rem;margin-top:.5rem}.lang-mobile-label{display:block;font-size:.8rem;color:var(--text-dim);margin-bottom:.5rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em}.lang-mobile-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:.25rem}.lang-mobile-grid a{text-align:center;padding:.5rem;border-radius:var(--radius-sm);font-size:.8rem;color:var(--text-muted);text-decoration:none;background:var(--bg-tertiary)}.lang-mobile-grid a:hover{color:var(--text-white);background:#ffffff1a}.footer-col a.lang-active{color:var(--accent-blue)}@media(max-width:900px){.lang-switcher{display:none}}@media(max-width:480px){.lang-mobile-grid{grid-template-columns:repeat(3,1fr)}}