.concept{background:#FAFAFA}.concept-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:32px}.concept-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px}.concept-card .step{font-family:var(--mono);font-size:11px;color:var(--accent);letter-spacing:.12em}.concept-card .icon{width:36px;height:36px;border-radius:8px;background:#FBE8DD;display:grid;place-items:center;margin:18px 0 16px;color:#A04A2C}.concept-card h3{font-size:18px;font-weight:500;margin-bottom:8px;letter-spacing:-.005em}.concept-card p{font-size:14px;color:var(--fg-muted);line-height:1.55}@media (max-width:900px){.concept-grid{grid-template-columns:repeat(2,1fr)}}