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(width<=640px){.app-body,.panel{padding:12px}.sample-info-grid{grid-template-columns:1fr}.predictor-row,.custom-factor-row-top,.ds-f-settings,.stats-toolbar,.gsa-factor-inputs{flex-direction:column;align-items:stretch}.chart-header>div,.export-actions,.chart-view-toggle{width:100%}.chart-settings-popover{grid-template-columns:1fr;margin-bottom:12px;position:static}.export-actions .btn-secondary,.chart-view-toggle .btn-secondary{flex:auto}}.guide-overlay{z-index:9999;background:#00000080;justify-content:center;align-items:center;animation:.2s fadeIn;display:flex;position:fixed;inset:0}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.guide-modal{background:var(--surface);border-radius:12px;flex-direction:column;width:90vw;max-width:960px;height:80vh;animation:.25s slideUp;display:flex;box-shadow:0 20px 60px #0000004d}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.guide-header{border-bottom:1px solid var(--border);flex-shrink:0;justify-content:space-between;align-items:center;padding:16px 24px;display:flex}.guide-header h2{color:var(--text);font-size:18px;font-weight:700}.guide-close{color:var(--text-light);cursor:pointer;background:0 0;border:none;border-radius:4px;padding:4px 8px;font-size:24px;line-height:1}.guide-close:hover{background:var(--bg);color:var(--text)}.guide-body{flex:1;display:flex;overflow:hidden}.guide-nav{border-right:1px solid var(--border);background:var(--bg);flex-shrink:0;width:200px;padding:12px 0;overflow-y:auto}.guide-nav-item{text-align:left;width:100%;color:var(--text-light);cursor:pointer;background:0 0;border:none;padding:10px 20px;font-size:13px;transition:all .15s;display:block}.guide-nav-item:hover{color:var(--text);background:#0000000a}.guide-nav-item.active{color:var(--primary);background:var(--primary-light);border-right:3px solid var(--primary);font-weight:600}.guide-content{flex:1;padding:24px 32px;overflow-y:auto}.guide-content h3{color:var(--primary-dark);border-bottom:2px solid var(--primary-light);margin-bottom:16px;padding-bottom:8px;font-size:20px;font-weight:700}.guide-text p{color:var(--text);min-height:4px;margin:0;padding:0;font-size:14px;line-height:1.7}.guide-text p:empty{min-height:12px}