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li{display:flex;align-items:flex-start;gap:.75rem;font-size:.95rem;color:var(--text-2);line-height:1.6}.chk{width:22px;height:22px;border-radius:50%;flex-shrink:0;background:var(--green-soft);color:var(--green);font-size:.75rem;font-weight:800;display:flex;align-items:center;justify-content:center;margin-top:.15rem;border:1.5px solid var(--green)}#system{background:var(--bg)}.system-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:1.25rem;margin-top:3rem}.sys-card{background:var(--bg-card);border:1.5px solid var(--border);border-radius:var(--radius-lg);padding:1.75rem;transition:transform .25s,box-shadow .25s,border-color .25s;cursor:default;position:relative;overflow:hidden;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}.sys-card:after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,transparent,rgba(99,102,241,.04));opacity:0;transition:opacity 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p{font-size:.875rem;color:var(--text-3);line-height:1.7}#demo{background:var(--bg2)}.demo-wrapper{display:grid;grid-template-columns:1fr 1fr;gap:2.5rem;align-items:start;margin-top:3rem}.demo-problem-card{background:var(--bg-card);border:1.5px solid var(--border);border-radius:var(--radius-lg);padding:2rem;box-shadow:var(--shadow-md)}.demo-chapter{font-size:.7rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--pink);display:flex;align-items:center;gap:.4rem;margin-bottom:1.25rem}.demo-chapter:before{content:"";width:16px;height:2px;background:var(--pink);border-radius:1px}.demo-eq{font-family:JetBrains Mono,monospace;font-size:clamp(1.35rem,3.5vw,2rem);color:var(--text);text-align:center;padding:1.25rem;background:linear-gradient(135deg,var(--indigo-soft),var(--amber-soft));border-radius:10px;margin-bottom:1.5rem;border:1px solid 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