.engine-layout{display:grid;grid-template-columns:250px minmax(0,1fr) 285px;max-width:1900px;margin:auto}.engine-inventory,.engine-controls{padding:22px 16px;background:#fff}.engine-inventory{border-right:1px solid var(--line)}.engine-controls{border-left:1px solid var(--line)}.engine-workspace{padding:24px;min-width:0}.engine-parts{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:16px}.engine-part{height:118px;padding:7px 4px;display:flex;flex-direction:column;align-items:center;gap:4px;position:relative}.engine-part svg{width:45px;height:60px;flex-shrink:0}.engine-part strong{font-size:11px;line-height:1.25;max-width:100%;overflow-wrap:anywhere}.engine-part small{font-size:10px;color:#647078}.engine-part[aria-pressed=true]{border-color:#126b63;background:#edf6f2}.engine-part.is-installed small{color:#126b63}.engine-drawing{overflow-x:auto;border-bottom:3px solid #8da1ac;margin-top:20px}.engine-drawing svg{display:block;width:100%;min-width:680px;height:auto}.engine-workspace>progress{width:100%;height:10px;display:block;accent-color:#126b63;margin-top:15px}.engine-section{padding:22px 0;border-bottom:1px solid var(--line)}.engine-section dl{font-size:12px;grid-template-columns:minmax(0,1fr) auto}.engine-section p{line-height:1.7;font-size:13px;margin-top:12px}.stroke-tabs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;margin-top:16px}.stroke-tabs button{font-size:12px;padding:10px 4px;min-width:0}.stroke-tabs [aria-pressed=true]{background:#e7f1ed;border-color:#126b63;color:#126b63}.cycle-toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:14px}.cycle-toolbar .primary{width:auto}.cycle-toolbar label{display:flex;align-items:center;gap:10px;margin:0}.cycle-toolbar select{width:110px}.engine-controls>button{width:100%;margin:6px 0}.engine-controls h3{margin-top:22px}.engine-controls .selection-info{min-height:64px;line-height:1.7;margin-top:12px}.assembly-tools{display:grid;gap:8px;margin-top:10px}.hint-text{font-size:12px;color:#6f633f;line-height:1.7;margin-top:12px}.engine-workspace .results strong{font-size:23px}.engine-workspace .notice{padding:14px 0}.engine-controls select{font-size:12px}.engine-workspace .eyebrow{font-size:10px}.engine-workspace .model-details p{font-size:12px}
@media(max-width:1150px){.engine-layout{grid-template-columns:210px minmax(0,1fr)}.engine-controls{grid-column:1/-1;border-top:1px solid var(--line);border-left:0}.engine-workspace{padding:20px}.engine-controls .selection-info{min-height:0}}
@media(max-width:650px){.engine-layout{display:flex;flex-direction:column}.engine-inventory{order:0;border-right:0;border-bottom:1px solid var(--line)}.engine-controls{order:1}.engine-workspace{order:2;padding:18px 14px}.engine-parts{grid-template-columns:repeat(4,minmax(0,1fr));gap:6px}.engine-part{height:122px;font-size:10px}.engine-part svg{width:39px;height:55px}.engine-part strong{font-size:10px}.stroke-tabs{grid-template-columns:1fr 1fr}.engine-workspace .results strong{font-size:19px}.engine-workspace .results span{font-size:10px}}
/* Independent shelves and a fixed working frame on desktop. */
@media(min-width:901px){
 .engine-layout{height:calc(100vh - 105px);grid-template-columns:270px minmax(0,1fr) 310px;overflow:hidden}
 .engine-inventory,.engine-controls,.engine-workspace{height:100%;overflow-y:auto;min-height:0}
 .engine-controls{grid-column:auto;border-left:1px solid var(--line);border-top:0}
 .engine-workspace{padding:18px}
}
.engine-parts{grid-template-columns:1fr;gap:10px}
.engine-part{height:auto;min-height:164px;display:grid;grid-template-columns:85px 1fr;align-items:center;padding:12px;gap:7px;text-align:left}
.engine-part svg{width:85px;height:112px;grid-row:1/4}
.engine-part strong{font-size:13px;line-height:1.4}
.engine-part small{font-size:11px}
.part-number{position:absolute;left:8px;top:6px;border-radius:4px;background:#1b6175;color:#fff;padding:2px 6px;font-size:12px;font-weight:bold}
.engine-view-frame{margin-top:16px;border:1px solid #bfd1dc;border-radius:12px;background:#f4f9fb;padding:12px}
.engine-view-frame h3{margin:0 0 9px;color:#315e75}
.engine-view-buttons{display:flex;flex-wrap:wrap;gap:6px;position:sticky;top:0;background:#f4f9fb;padding:8px 0;z-index:2}
.engine-view-buttons button{font-size:12px;padding:7px 10px}
.engine-drawing{margin-top:6px;border:0;min-height:420px}
.engine-drawing svg{min-width:0;width:100%;height:auto;max-height:620px}
.engine-part-preview{border:1px solid #d1e0e8;background:#f1f7fa;border-radius:9px;margin:12px 0;text-align:center}
.engine-part-preview svg{width:130px;height:169px}
.engine-controls h3{margin-top:15px}
@media(min-width:901px) and (max-width:1150px){.engine-layout{grid-template-columns:220px minmax(0,1fr) 260px}.engine-drawing{min-height:300px}}
@media(max-width:900px){.engine-layout{display:flex;flex-direction:column}.engine-parts{grid-template-columns:repeat(2,minmax(0,1fr));max-height:380px;overflow:auto}.engine-inventory{order:0}.engine-workspace{order:1}.engine-controls{order:2;max-height:600px;overflow:auto}.engine-drawing{min-height:280px}}