/* Usecase */
.usecase-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.usecase-card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 32px 28px; text-align: center; transition: transform .3s, box-shadow .3s;
}
.usecase-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.usecase-icon { font-size: 36px; margin-bottom: 14px; }
.usecase-card h4 { font-size: 16px; font-weight: 700; color: var(--navy); margin-bottom: 8px; }
.usecase-card p { font-size: 14px; color: var(--text-sub); line-height: 1.9; }

/* Steps */
.step-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; max-width: 960px; margin: 0 auto; }
.step-card { text-align: center; }
.step-num { display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; background: var(--red); color: var(--white); font-weight: 900; font-size: 16px; border-radius: 50%; margin-bottom: 16px; }
.step-card h4 { font-size: 15px; font-weight: 700; color: var(--navy); margin-bottom: 8px; }
.step-card p { font-size: 13px; color: var(--text-sub); line-height: 1.8; }

/* Set */
.set-box {
  background: var(--bg-light); border-radius: var(--radius-lg); padding: 48px 40px;
  max-width: 720px; margin: 0 auto; text-align: center;
}
.set-box h3 { font-size: 22px; font-weight: 900; color: var(--navy); margin-bottom: 12px; }
.set-box p { font-size: 15px; color: var(--text-sub); line-height: 2; }
.set-badge { display: inline-block; background: var(--red); color: var(--white); font-size: 13px; font-weight: 700; padding: 6px 18px; border-radius: 4px; margin-bottom: 16px; }

/* FAQ */
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item { background: var(--white); border: 1px solid var(--border); border-radius: 12px; margin-bottom: 12px; overflow: hidden; }
.faq-q { display: flex; align-items: center; gap: 12px; padding: 20px 24px; cursor: pointer; font-size: 16px; font-weight: 600; color: var(--navy); transition: background .2s; }
.faq-q:hover { background: rgba(4,52,90,.02); }
.faq-a { display: none; padding: 0 24px 20px; }
.faq-item.open .faq-a { display: block; }
.faq-a p { padding: 0 24px 20px 68px; font-size: 15px; line-height: 1.8; color: var(--text-sub); }

/* Responsive */
@media (max-width: 900px) {
  .usecase-grid { grid-template-columns: 1fr; }
  .step-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
}
@media (max-width: 480px) {
  .step-grid { grid-template-columns: 1fr; }
}