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beaker-cloud{0%{opacity:0}to{opacity:.97}}.tube-ppt{height:26%;transition:background .3s;position:absolute;bottom:0;left:0;right:0}.tube-bubbles{background-image:radial-gradient(circle,#ffffffb3 2px,#0000 3px);background-size:12px 16px;animation:1.4s linear infinite bubble-up;position:absolute;inset:0}@keyframes bubble-up{0%{background-position:0 16px}to{background-position:0 0}}.chip-right{background:#3fb9504d;border-color:#3fb950}.chip-wrong{background:#f8514940;border-color:#f85149}.spring-wrap{flex-direction:column;align-items:center;gap:4px;display:flex}.spring{background:repeating-linear-gradient(0deg,#90a4ae 0 3px,#0000 3px 8px);border-left:2px solid #90a4ae;border-right:2px solid #90a4ae;width:26px;transition:height .25s}.spring-mass{background:#1f6feb;border-radius:6px;padding:.2rem .8rem;font-size:.85rem;font-weight:600}.bulbs{justify-content:center;gap:1rem;font-size:2.2rem;display:flex}.bulb{border-radius:50%;transition:opacity .3s,box-shadow .3s;display:inline-block}.seo-static{max-width:880px;margin:0 auto;padding:1.5rem 1.5rem 3rem;line-height:1.7}.seo-static header nav{color:var(--text-muted);margin-bottom:1.5rem;font-weight:600}.seo-static h1{margin:.5rem 0 1rem;font-size:clamp(1.8rem,5vw,2.8rem)}.seo-static h2{margin:2rem 0 .6rem;font-size:1.3rem}.seo-static ul,.seo-static ol{padding-left:1.3rem}.seo-static li{margin-bottom:.5rem}.seo-static li span{color:var(--text-muted);font-size:.92rem}.seo-static footer{color:var(--text-muted);margin-top:3rem;font-size:.9rem}