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1rem;font-size:.75rem;font-weight:500;font-family:inherit;color:var(--text-dim);background:var(--surface);border:1px solid var(--border);border-radius:20px;cursor:pointer;letter-spacing:.02em;transition:border-color .15s,color .15s}.btn-info:hover{color:var(--text);border-color:var(--accent-propano)}.overlay{position:fixed;inset:0;z-index:100;background:#000c;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;padding:1.5rem;animation:fadeIn .2s ease}.overlay.hidden{display:none}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.overlay-inner{max-width:560px;width:100%;display:flex;flex-direction:column;gap:1rem;touch-action:pan-y}.overlay-header{display:flex;justify-content:space-between;align-items:center}.page-indicator{font-size:.72rem;color:var(--text-dim);font-variant-numeric:tabular-nums}.btn-close{width:36px;height:36px;font-size:1.4rem;line-height:1;font-family:inherit;color:var(--text-dim);background:var(--surface);border:1px solid var(--border);border-radius:50%;cursor:pointer;transition:color .15s,border-color .15s}.btn-close:hover{color:var(--text);border-color:var(--accent-propano)}.carousel{position:relative;overflow:hidden}.carousel .card{display:none;animation:slideIn .25s ease}.carousel .card.active{display:block}@keyframes slideIn{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}.carousel-nav{display:flex;align-items:center;justify-content:center;gap:1rem}.btn-nav{width:36px;height:36px;font-size:1rem;font-family:inherit;color:var(--text-dim);background:var(--surface);border:1px solid var(--border);border-radius:50%;cursor:pointer;transition:color .15s,border-color .15s;flex-shrink:0}.btn-nav:hover{color:var(--text);border-color:var(--accent-propano)}.btn-nav:disabled{opacity:.25;cursor:default}.dots{display:flex;gap:.4rem}.dots span{width:6px;height:6px;border-radius:50%;background:var(--border);transition:background .15s}.dots span.active{background:var(--accent-propano)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem 1.5rem}.card h2{font-size:.9rem;font-weight:600;color:var(--text);margin-bottom:.6rem;letter-spacing:-.01em}.card p{font-size:.8rem;line-height:1.6;color:var(--text-dim);margin-bottom:.5rem}.card p:last-child{margin-bottom:0}.card strong{color:var(--text);font-weight:500}.card em{font-style:italic}.card .formula{font-family:Courier New,monospace;font-size:.85rem;color:var(--accent-propano);text-align:center;padding:.5rem 0}.card ul{list-style:none;padding:0;display:flex;flex-direction:column;gap:.4rem}.card li{font-size:.78rem;line-height:1.5;color:var(--text-dim);padding-left:1rem;position:relative}.card li:before{content:"";position:absolute;left:0;top:.5em;width:4px;height:4px;border-radius:50%;background:var(--border)}.card-warning{border-color:#ef44444d}.card-warning h2{color:#ef4444}.param-grid{display:grid;grid-template-columns:1fr 1fr;gap:.6rem}.param{display:flex;flex-direction:column;gap:.15rem}.param strong{font-size:.78rem;color:var(--text)}.param span{font-size:.72rem;color:var(--text-dim);line-height:1.5}@media(max-width:768px){main{grid-template-columns:1fr}.controls{position:static}.chart-container{aspect-ratio:4 / 3}}