.seq-layout{height:calc(100vh - 44px);display:flex;overflow:hidden}#seq-canvas{background:#1e2127;flex:1;min-width:0}.seq-editor-panel{background:#21252b;border-left:1px solid #181a1f;flex-direction:column;flex-shrink:0;width:70vw;display:flex}.seq-editor-panel .cm-container{flex:1;min-height:0}.seq-editor-panel .console{height:140px}#start-overlay{z-index:10;background:#1e2127eb;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}#start-btn{color:#7ec87e;cursor:pointer;background:#2d4a2d;border:2px solid #4caf50;border-radius:6px;padding:14px 40px;font-size:18px;font-weight:700;transition:background .15s,color .15s}#start-btn:hover{color:#a8e0a8;background:#3a6b3a}