.elt-shell{max-width:900px;margin:0 auto}.elt-context-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.elt-ctx-btn{padding:12px 14px;border:1px solid rgb(255 255 255 / .16);border-radius:10px;background:rgb(255 255 255 / .05);color:rgb(255 255 255 / .85);font-size:13px;font-weight:600;cursor:pointer;transition:background .2s,border-color .2s,color .2s;font-family:inherit;text-align:left;line-height:1.3}.elt-ctx-btn:hover{border-color:rgb(255 255 255 / .3)}.elt-ctx-btn.active{background:rgb(238 49 36 / .16);border-color:var(--red);color:#fff}.elt-ctx-inline{margin-top:16px;padding-top:16px;border-top:1px solid rgb(255 255 255 / .08)}.elt-ctx-inline>label{display:block;margin-bottom:9px;font-size:10px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:rgb(255 255 255 / .58)}.elt-ctx-inline>label em{font-style:normal;text-transform:none;letter-spacing:0;font-weight:500;color:rgb(255 255 255 / .42)}.elt-context-grid--sm{display:flex;flex-wrap:wrap;gap:6px}.elt-context-grid--sm .elt-ctx-btn{flex:1 1 auto;min-width:110px;text-align:center;padding:8px 12px;font-size:12px;font-weight:600;border-radius:8px}.elt-crosssection-wrap{display:flex;flex-direction:column;align-items:center;padding:8px 0 4px}.elt-crosssection{width:194px;height:194px}.elt-duct-wall{fill:none;stroke:url(#eltPipeWall);stroke-width:16}.elt-duct-ridges{opacity:.85}.elt-duct-ridges line{stroke:rgb(0 0 0 / .35);stroke-width:2.5;stroke-linecap:round}.elt-duct-outline{fill:#171b30;stroke:rgb(255 255 255 / .4);stroke-width:3;transition:r .6s cubic-bezier(.16,1,.3,1)}.elt-cable-dot{fill:var(--red);stroke:rgb(0 0 0 / .3);stroke-width:.75}.elt-crosssection-caption{font-size:11px;color:rgb(255 255 255 / .6);text-align:center;margin:10px 0 0;max-width:210px;line-height:1.45}.elt-viz-row{display:contents}.elt-viz-result{display:none}@media (max-width:640px){.elt-viz-row{display:flex;align-items:center;gap:12px}.elt-crosssection-wrap{flex:0 0 62%;padding:4px 0}.elt-crosssection{width:100%;height:auto}.elt-crosssection-caption{display:none}.elt-viz-result{display:flex;flex-direction:column;align-items:center;text-align:center;flex:1;min-width:0;gap:1px}.elt-viz-result .res-val{font-size:38px}.elt-viz-result .res-unit{font-size:10px;margin-top:2px}.elt-viz-result .res-lbl{font-size:9px;line-height:1.3}.elt-shell .result-panel .res-main{display:none}.elt-shell .res-secondary{grid-template-columns:1fr 1fr}}.elt-how{max-width:860px;margin:56px auto 0;padding-bottom:8px}.elt-how-eyebrow{display:inline-block;font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--red);margin-bottom:10px}.elt-how h2{font-size:26px;font-weight:800;color:var(--pg-heading,#2a2a2a);margin:0 0 14px;line-height:1.3}.elt-how-lead{font-size:16px;line-height:1.7;color:var(--pg-body,#555);max-width:640px;margin:0 0 32px}.elt-how-lead strong{color:var(--pg-heading,#2a2a2a)}.elt-reason-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:0 0 20px}.elt-reason-card{background:var(--light-bg,#f8f9fa);border:1px solid #e9ecef;border-radius:14px;padding:22px 22px 24px}.elt-reason-icon{display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:10px;background:rgb(238 49 36 / .08);color:var(--red);margin-bottom:14px}.elt-reason-icon svg{width:22px;height:22px}.elt-reason-card h3{font-size:16px;font-weight:700;color:var(--pg-heading,#2a2a2a);margin:0 0 8px}.elt-reason-card p{font-size:14.5px;line-height:1.6;color:var(--pg-body,#555);margin:0}.elt-reason-card em{color:var(--pg-heading,#2a2a2a);font-style:normal;font-weight:600}.elt-insight-card{display:flex;gap:16px;align-items:flex-start;background:rgb(238 49 36 / .05);border:1px solid rgb(238 49 36 / .18);border-radius:14px;padding:22px;margin:0 0 32px}.elt-insight-icon{flex-shrink:0;display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:10px;background:rgb(238 49 36 / .12);color:var(--red)}.elt-insight-icon svg{width:22px;height:22px}.elt-insight-card h3{font-size:16px;font-weight:700;color:var(--pg-heading,#2a2a2a);margin:0 0 8px}.elt-insight-card p{font-size:14.5px;line-height:1.65;color:var(--pg-body,#555);margin:0}.elt-insight-card strong{color:var(--red);font-weight:700}.elt-steps{background:var(--dark-bg,#171b30);border-radius:16px;padding:28px 28px 24px;margin:0 0 28px}.elt-steps-title{font-size:15px;font-weight:700;color:#fff;margin:0 0 18px}.elt-steps-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:16px}.elt-steps-list li{display:flex;gap:14px;align-items:flex-start}.elt-step-n{flex-shrink:0;display:flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:50%;background:var(--red);color:#fff;font-size:13px;font-weight:800;margin-top:1px}.elt-steps-list div{font-size:14.5px;line-height:1.6;color:rgb(255 255 255 / .82)}.elt-steps-list strong{color:#fff}.elt-distinction{display:flex;gap:14px;align-items:flex-start;padding:18px 20px;border-radius:12px;background:var(--pg-bg,#f6f7f8);border:1px solid var(--pg-border,#eaebed);margin:0 0 20px}.elt-distinction-icon{flex-shrink:0;width:20px;height:20px;color:var(--gray9,#777B83);margin-top:2px}.elt-distinction p{font-size:13.5px;line-height:1.65;color:var(--pg-muted,#888b90);margin:0}.elt-distinction strong{color:var(--pg-body,#555)}.elt-alert{display:flex;gap:14px;align-items:flex-start;padding:16px 20px;border-radius:12px;margin:0}.elt-alert-icon{flex-shrink:0;width:20px;height:20px;margin-top:2px}.elt-alert p{font-size:13.5px;line-height:1.6;margin:0}.elt-alert-warning{background:#fff3cd;border:1px solid #ffc107;color:#664d03}.elt-alert-warning .elt-alert-icon{color:#b8860b}.elt-alert-warning strong{color:#4a3800}@media (max-width:640px){.elt-context-grid--sm .elt-ctx-btn{min-width:46%}.elt-reason-grid{grid-template-columns:1fr}.elt-how{margin-top:40px}.elt-steps{padding:22px 20px}.elt-insight-card,.elt-distinction,.elt-alert{flex-direction:column}}