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0;border:none;border-radius:6px;padding:9px 18px;font-size:13.5px;font-weight:500}.learning-switch button[aria-pressed=true]{color:var(--primary);box-shadow:var(--shadow-sm);background:#fff;font-weight:600}.usage-step{border-bottom:1px solid var(--line);gap:20px;padding:22px 0;display:flex}.usage-step>span{background:var(--primary-light);width:36px;height:36px;color:var(--primary);border-radius:50%;flex-shrink:0;place-items:center;font-size:14px;font-weight:700;display:grid}.usage-step h2{margin-bottom:6px;font-size:18px;font-weight:700}.usage-step p{color:var(--text-muted);margin:0;font-size:14px;line-height:1.6}.model-tour{border-radius:var(--radius-lg);border:1px solid var(--line);box-shadow:var(--shadow-md);background:#fff;grid-template-columns:1fr 380px;gap:32px;padding:28px;display:grid}.model-plate{border-radius:var(--radius-md);background:#090d16;margin:0;overflow:hidden}.model-plate-label{color:#94a3b8;background:#0f172a;justify-content:space-between;padding:12px 18px;font-size:11px;display:flex}.model-image{place-items:center;height:360px;padding:16px;display:grid}.model-image img{object-fit:contain;max-width:100%;max-height:100%}.model-explanation select{border:1px solid var(--line);border-radius:var(--radius-sm);background:#fff;width:100%;height:44px;margin:8px 0 20px;padding:0 14px;font-size:13.5px}.model-description h2{margin-bottom:10px;font-size:24px;font-weight:700}.model-description p{color:var(--text-muted);font-size:14px;line-height:1.6}.model-pagination{border-top:1px solid var(--line);justify-content:space-between;align-items:center;margin-top:24px;padding-top:20px;display:flex}@media (width<=1024px){.reading-desk,.model-tour{grid-template-columns:1fr}.atlas-footer{flex-direction:column;align-items:flex-start;gap:16px}.footer-left{flex-direction:column;align-items:flex-start;gap:6px}}@media (width<=768px){.atlas-nav{flex-wrap:wrap;gap:12px}.atlas-nav nav{order:3;width:100%;padding-bottom:4px;overflow-x:auto}.workflow{flex-direction:column}.image-stage{height:340px}}