.case-hero {
  background:
    radial-gradient(
      circle at 12% 18%,
      rgba(7, 150, 255, 0.18),
      transparent 30%
    ),
    radial-gradient(
      circle at 88% 30%,
      rgba(11, 222, 177, 0.16),
      transparent 28%
    ),
    linear-gradient(180deg, #f6fbff 0%, #ffffff 100%);
}

.proof-ribbon {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 22px 55px -42px rgba(8, 33, 50, 0.55);
}

.proof-ribbon > div {
  padding: 1.35rem 1.5rem;
}

.proof-ribbon > div + div {
  border-left: 1px solid var(--line);
}

.proof-ribbon strong {
  display: block;
  color: var(--ink);
  font-family: "Bricolage Grotesque", system-ui, sans-serif;
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  letter-spacing: -0.045em;
  line-height: 1;
}

.proof-ribbon span {
  display: block;
  margin-top: 0.45rem;
  color: var(--ink-mute);
  font-size: 0.75rem;
  line-height: 1.5;
}

.case-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--paper);
  box-shadow: 0 24px 65px -48px rgba(8, 33, 50, 0.6);
}

.case-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 5px;
  background: linear-gradient(90deg, var(--brand), var(--cyan), var(--mint));
}

.case-card-head {
  padding: 2rem 2rem 1.5rem;
}

.case-number {
  display: inline-grid;
  width: 2.3rem;
  height: 2.3rem;
  place-items: center;
  border-radius: 0.8rem;
  background: var(--ink);
  color: var(--mint);
  font:
    600 0.68rem/1 "JetBrains Mono",
    monospace;
}

.case-card h2 {
  margin-top: 1.15rem;
  color: var(--ink);
  font-family: "Bricolage Grotesque", system-ui, sans-serif;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 1.04;
}

.case-summary {
  margin-top: 0.9rem;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.75;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border-block: 1px solid var(--line);
  background: var(--line);
}

.metric {
  min-height: 124px;
  padding: 1.25rem 1.15rem;
  background: linear-gradient(145deg, #f3faff, #f2fffb);
}

.metric strong {
  display: block;
  color: var(--brand-deep);
  font-family: "Bricolage Grotesque", system-ui, sans-serif;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  letter-spacing: -0.04em;
  line-height: 1;
}

.metric span {
  display: block;
  margin-top: 0.5rem;
  color: var(--ink-soft);
  font-size: 0.73rem;
  line-height: 1.5;
}

.case-details {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 2rem;
  padding: 1.7rem 2rem 2rem;
}

.case-details h3 {
  color: var(--ink);
  font-family: "Bricolage Grotesque", system-ui, sans-serif;
  font-size: 1rem;
  font-weight: 600;
}

.case-details p,
.case-details li {
  color: var(--ink-soft);
  font-size: 0.86rem;
  line-height: 1.7;
}

.case-details ul {
  display: grid;
  gap: 0.55rem;
  margin-top: 0.7rem;
}

.case-details li {
  position: relative;
  padding-left: 1.2rem;
}

.case-details li::before {
  content: "";
  position: absolute;
  top: 0.66rem;
  left: 0;
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 999px;
  background: var(--mint);
}

.source-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-top: 1rem;
  color: var(--brand-deep);
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.evidence-note {
  border: 1px solid rgba(177, 137, 55, 0.3);
  border-radius: 20px;
  background: linear-gradient(135deg, #fff8e8, #fffdf7);
  padding: 1.35rem 1.5rem;
}

.business-fit-card {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: white;
  padding: 1.4rem;
}

.business-fit-card span {
  display: inline-block;
  color: var(--brand-deep);
  font:
    600 0.64rem/1 "JetBrains Mono",
    monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.business-fit-card h3 {
  margin-top: 0.8rem;
  color: var(--ink);
  font-family: "Bricolage Grotesque", system-ui, sans-serif;
  font-size: 1.22rem;
  font-weight: 600;
}

.business-fit-card p {
  margin-top: 0.55rem;
  color: var(--ink-soft);
  font-size: 0.86rem;
  line-height: 1.7;
}

.case-faq {
  display: grid;
  gap: 0.75rem;
}

.case-faq details {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--paper);
  padding: 0 1.3rem;
}

.case-faq summary {
  position: relative;
  cursor: pointer;
  padding: 1.2rem 2rem 1.2rem 0;
  color: var(--ink);
  font-weight: 700;
  list-style: none;
}

.case-faq summary::-webkit-details-marker {
  display: none;
}

.case-faq summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 0;
  color: var(--brand-deep);
  font-size: 1.35rem;
  transform: translateY(-50%);
}

.case-faq details[open] summary::after {
  content: "−";
}

.case-faq details p {
  padding: 0 0 1.25rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.75;
}

@media (max-width: 760px) {
  .proof-ribbon {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .proof-ribbon > div + div {
    border-left: 0;
  }

  .proof-ribbon > div:nth-child(even) {
    border-left: 1px solid var(--line);
  }

  .proof-ribbon > div:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }

  .metric-grid {
    grid-template-columns: 1fr;
  }

  .metric {
    min-height: 0;
  }

  .case-details {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
}

@media (max-width: 480px) {
  .proof-ribbon {
    grid-template-columns: 1fr;
  }

  .proof-ribbon > div:nth-child(even) {
    border-left: 0;
  }

  .proof-ribbon > div + div {
    border-top: 1px solid var(--line);
  }

  .case-card-head,
  .case-details {
    padding-inline: 1.35rem;
  }
}