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.chapter-card{cursor:pointer;position:relative;padding:var(--space-4);border-radius:var(--radius-lg);transition:all var(--duration-normal) ease}.chapter-grid .chapter-number{position:absolute;top:var(--space-3);right:var(--space-3);width:32px;height:32px;background:var(--accent-primary);color:var(--text-inverse);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:var(--text-sm)}.chapter-grid .chapter-content{margin-bottom:var(--space-3)}.chapter-grid .chapter-title{font-size:var(--text-lg);margin-bottom:var(--space-1);color:var(--text-primary)}.chapter-grid .chapter-subtitle{font-size:var(--text-sm);color:var(--text-secondary);margin-bottom:var(--space-2)}.chapter-features{display:flex;flex-wrap:wrap;gap:var(--space-1);margin-top:var(--space-2)}.feature-tag{padding:2px var(--space-2);background:var(--accent-secondary);color:var(--text-inverse);border-radius:var(--radius-full);font-size:var(--text-xs);font-weight:500}.chapter-grid .chapter-progress{height:4px;background:rgba(255,255,255,.1);border-radius:2px;overflow:hidden}.chapter-grid .progress-bar{height:100%;background:linear-gradient(90deg,var(--accent-primary),var(--accent-secondary));width:var(--progress,0%);transition:width var(--duration-slow) ease}.chapter-nav{position:fixed;top:0;left:0;right:0;z-index:var(--z-fixed);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:var(--space-4) 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