.fsrs-simulation-header{text-align:center;max-width:600px;margin:0 auto 3rem}.fsrs-simulation-header h2{margin-bottom:1rem;font-size:2rem;font-weight:700}.fsrs-simulation-header p{color:var(--text-secondary);font-size:1.125rem;line-height:1.6}.expanded-container{max-width:1200px}.pulse-glow{animation:2s infinite pulseButton;box-shadow:0 0 15px #3b82f666}@keyframes pulseButton{0%{box-shadow:0 0 15px #3b82f666}50%{box-shadow:0 0 25px #3b82f6cc}to{box-shadow:0 0 15px #3b82f666}}.fsrs-interactive-section{max-width:1000px;margin:0 auto}.fsrs-visualizer{border-radius:var(--radius-lg);flex-direction:column;min-height:500px;display:flex;overflow:hidden}.fsrs-toolbar{background-color:var(--bg-secondary);border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:1rem 1.5rem;display:flex}.step-indicator{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;font-size:.875rem;font-weight:600}.fsrs-stats{gap:1rem;display:flex}.stat-badge{background-color:var(--bg-tertiary);border-radius:var(--radius-full);align-items:center;gap:.5rem;padding:.25rem .75rem;font-size:.875rem;font-weight:500;display:flex}.stat-badge.highlight{color:var(--accent-color);background-color:#3b82f61a;border:1px solid #3b82f633}.fsrs-content-area{flex:1;padding:3rem 2rem;position:relative}.simulation-layout{grid-template-columns:1fr;align-items:center;gap:4rem;display:grid}@media (min-width:768px){.simulation-layout{grid-template-columns:1fr 1fr}}.demo-flashcard-container{flex-direction:column;align-items:center;gap:2rem;display:flex}.demo-flashcard{aspect-ratio:4/3;background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);text-align:center;width:100%;max-width:320px;box-shadow:var(--shadow-md);justify-content:center;align-items:center;padding:2rem;font-size:1.25rem;font-weight:500;display:flex}.demo-actions{gap:.5rem;width:100%;max-width:320px;display:flex}.demo-btn{border-radius:var(--radius-sm);cursor:default;transition:opacity var(--transition-fast);border:none;flex:1;padding:.5rem 0;font-size:.875rem;font-weight:600}.again{color:#fff;opacity:.4;background-color:#ef4444}.hard{color:#fff;opacity:.4;background-color:#f59e0b}.good{color:#fff;opacity:.4;background-color:#22c55e}.easy{color:#fff;opacity:.4;background-color:#3b82f6}.demo-btn.clicking{opacity:1;box-shadow:0 0 0 3px var(--bg-primary),0 0 0 5px currentColor;animation:2s infinite pulseClick}@keyframes pulseClick{0%{transform:scale(1)}50%{transform:scale(1.05)}to{transform:scale(1)}}.demo-explanation h3{margin-bottom:1rem;font-size:1.5rem;font-weight:700}.demo-explanation p{color:var(--text-secondary);margin-bottom:2rem;line-height:1.6}.algorithm-insight{background:linear-gradient(to bottom right,#3b82f60d,#0000);border:1px solid #3b82f633;padding:1.5rem}.insight-header{text-transform:uppercase;letter-spacing:.05em;border-bottom:1px solid var(--border-color);align-items:center;gap:.5rem;margin-bottom:1rem;padding-bottom:.75rem;font-size:.875rem;font-weight:700;display:flex}.insight-data{flex-direction:column;gap:.75rem;display:flex}.data-row{justify-content:space-between;font-size:.9375rem;display:flex}.data-row span{color:var(--text-secondary)}.highlight-row{border-top:1px dashed var(--border-color);margin-top:.5rem;padding-top:.5rem;font-size:1.125rem}.fsrs-controls{background-color:var(--bg-secondary);border-top:1px solid var(--border-color);justify-content:flex-end;padding:1.5rem;display:flex}.next-btn,.reset-btn{align-items:center;gap:.5rem;display:flex}