.detail-hero { padding: 96px 0 72px; background: linear-gradient(180deg, var(--blue-soft), var(--page)); }
.detail-hero__layout { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(340px, .85fr); align-items: center; gap: clamp(42px, 7vw, 88px); }
.detail-hero__copy { min-width: 0; }
.detail-hero h1 { max-width: 13ch; margin: 16px 0 20px; font-size: clamp(42px, 6vw, 68px); line-height: 1.08; }
.detail-hero h1 span { display: block; }
.detail-hero__brief { position: relative; overflow: hidden; padding: clamp(28px, 4vw, 42px); color: #fff; background: var(--blue-dark); }
.detail-hero__brief::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image:
    linear-gradient(rgba(255,255,255,.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.1) 1px, transparent 1px);
  background-size: 52px 52px;
  opacity: .4;
}
.detail-hero__brief > * { position: relative; }
.detail-hero__brief-item + .detail-hero__brief-item { margin-top: 28px; padding-top: 28px; border-top: 1px solid rgba(255,255,255,.28); }
.detail-hero__brief-label { display: block; margin-bottom: 12px; color: #a9ddff; font-size: 14px; font-weight: 700; letter-spacing: .12em; }
.detail-hero__brief p { margin-bottom: 0; color: rgba(255,255,255,.82); font-size: 17px; }
.detail-hero__brief p.detail-hero__brief-lead { color: #fff; font-size: clamp(22px, 2.2vw, 28px); font-weight: 600; line-height: 1.45; }
.detail-section { padding: 72px 0; border-top: 1px solid var(--line); }
.reading-width { max-width: 760px; }
.definition { padding: 32px; background: var(--blue-soft); border-left: 4px solid var(--blue); }
.scenario-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.scenario { padding: 24px; background: var(--surface); border-top: 2px solid var(--blue); }
.system-links { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.delivery-steps { counter-reset: delivery; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.delivery-steps article { counter-increment: delivery; padding: 24px; border-top: 2px solid var(--blue); border-right: 1px solid var(--line); }
.security-notes { max-width: 840px; padding: 32px; background: var(--surface); border: 1px solid var(--line); }
.case-fact { margin-top: 24px; color: var(--blue-dark); font-weight: 600; }

.detail-section h2 { margin-bottom: 18px; font-size: clamp(32px, 4vw, 48px); line-height: 1.2; }
#data-security-title span { display: block; }
.detail-section h3 { margin-bottom: 10px; font-size: 21px; line-height: 1.35; }
.detail-section p { color: var(--muted); font-size: 18px; }
.detail-section p.section-kicker { color: var(--blue); font-size: 14px; }
.detail-section p:last-child, .scenario p:last-child, .system-links p:last-child, .delivery-steps p:last-child { margin-bottom: 0; }
.detail-hero__intro { max-width: 760px; margin-bottom: 0; color: var(--muted); font-size: 20px; }
.definition p { margin-bottom: 0; color: var(--ink); font-size: 19px; }
.scenario h3, .system-links h3, .delivery-steps h3 { color: var(--ink); }
.system-links article { padding: 24px; background: var(--surface); border: 1px solid var(--line); }
.system-links__code { display: block; margin-bottom: 28px; color: var(--blue); font-size: 14px; font-weight: 700; letter-spacing: 0.1em; }
.delivery-steps article::before { display: block; margin-bottom: 28px; color: var(--blue); content: "0" counter(delivery); font-size: 14px; font-weight: 700; letter-spacing: 0.1em; }
.security-notes ul { margin: 0; padding-left: 1.2em; }
.security-notes li + li { margin-top: 12px; }
.case-study { display: grid; grid-template-columns: minmax(220px, .7fr) minmax(0, 1.3fr); gap: clamp(32px, 7vw, 92px); padding: 72px 0; border-top: 1px solid var(--line); }
.case-study:nth-of-type(even) { grid-template-columns: minmax(0, 1.3fr) minmax(220px, .7fr); }
.case-study:nth-of-type(even) .case-study__heading { grid-column: 2; }
.case-study:nth-of-type(even) .case-study__body { grid-column: 1; grid-row: 1; }
.case-study__body p { max-width: 720px; }
.case-study__body h3 { margin: 28px 0 8px; color: var(--blue-dark); }
.case-study__heading h2 { margin-bottom: 0; }

@media (max-width: 960px) {
  .detail-hero__layout { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .scenario-list, .system-links, .delivery-steps { grid-template-columns: 1fr; }
  .detail-hero { padding: 64px 0 48px; }
  .detail-hero__brief { padding: 28px 24px; }
  .delivery-steps article { border-right: 0; border-bottom: 1px solid var(--line); }
  .case-study, .case-study:nth-of-type(even) { grid-template-columns: 1fr; gap: 20px; padding: 48px 0; }
  .case-study:nth-of-type(even) .case-study__heading,
  .case-study:nth-of-type(even) .case-study__body { grid-column: 1; grid-row: auto; }
  .detail-section { padding: 56px 0; }
  .definition, .security-notes { padding: 24px; }
}