/* page-install-steps.css — 8단계 시공 절차 (checklist page) */

:root {
  --cta-primary: #1E40AF;
  --cta-secondary: #EFF4FB;
}

body { font-family: 'Gothic A1', sans-serif; background: #EFF4FB; }

h1, h2, h3 { font-family: 'Gothic A1', sans-serif; font-weight: 800; color: #0f172a; }

.ist-hero {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 20px 24px;
  text-align: center;
}
.ist-hero h1 { font-size: clamp(1.6rem, 4vw, 2.1rem); margin-bottom: 16px; }
.ist-hero p { color: #334155; font-size: .98rem; }

.ist-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 20px 40px;
}
.ist-divider {
  display: block;
  width: 56px;
  height: 4px;
  border-radius: 2px;
  background: var(--cta-secondary-strong, #3B82F6);
  margin: 0 auto 18px;
}
.ist-section h2 {
  text-align: center;
  font-size: 1.4rem;
  margin-bottom: 24px;
}

.ist-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}

.ist-card {
  background: #fff;
  border: 1px solid #DCE6F5;
  border-radius: 14px;
  padding: 18px 18px 20px;
  position: relative;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.ist-card:hover,
.ist-card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 10px 22px rgba(30, 64, 175, .14);
  border-color: #93B4EC;
}
.ist-num {
  display: inline-block;
  font-weight: 800;
  font-size: .85rem;
  letter-spacing: .04em;
  color: #fff;
  background: var(--cta-primary);
  border-radius: 999px;
  padding: 3px 12px;
  margin-bottom: 10px;
}
.ist-card h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px dashed #CBD9F0;
}
.ist-card ul { list-style: none; display: flex; flex-direction: column; gap: 7px; }
.ist-card li {
  font-size: .9rem;
  color: #334155;
  padding-left: 18px;
  position: relative;
  line-height: 1.5;
}
.ist-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: #3B82F6;
}

/* 용어 정의 리스트 */
.ist-terms {
  max-width: 720px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid #DCE6F5;
  border-radius: 14px;
  padding: 22px 26px;
}
.ist-terms dt {
  font-weight: 800;
  color: #1E40AF;
  margin-top: 12px;
}
.ist-terms dt:first-child { margin-top: 0; }
.ist-terms dd {
  color: #334155;
  font-size: .92rem;
  margin: 4px 0 0;
}

/* 아코디언 FAQ */
.ist-faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.ist-faq-list details {
  background: #fff;
  border: 1px solid #DCE6F5;
  border-radius: 12px;
  padding: 14px 18px;
}
.ist-faq-list summary {
  font-weight: 700;
  color: #0f172a;
  font-size: .96rem;
  position: relative;
  padding-right: 28px;
}
.ist-faq-list summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-weight: 800;
  color: var(--cta-primary);
}
.ist-faq-list details[open] summary::after { content: "\2212"; }
.ist-faq-list p {
  margin-top: 10px;
  font-size: .9rem;
  color: #475569;
}

.cta { background: #fff; }
.cta-lead { color: #0f172a; }

@media (max-width: 480px) {
  .ist-terms, .ist-faq-list details { padding: 16px; }
}

/* ---- photo row: 1:1 crop (요청 반영) ---- */
.photo-row img { aspect-ratio: 1 / 1; }