/* =========================================================
   RESEARCH EXPLAINER PAGE
   ========================================================= */

.ex-container {
  width: min(1040px, calc(100% - 3rem));
  margin: 0 auto;
}

.ex-kicker,
.ex-summary-label {
  margin: 0;
  color: #2f7173;
  font-size: 0.7rem;
  font-weight: 760;
  letter-spacing: 0.17em;
}

.ex-hero {
  margin-top: -1rem;
  padding: 5rem 0 4.4rem;
  background:
    radial-gradient(circle at 88% 18%, rgba(47, 113, 115, 0.14), transparent 28%),
    linear-gradient(135deg, #f7f5f0, #ffffff);
  border-bottom: 1px solid #dfe6e7;
}

.ex-hero h1 {
  max-width: 920px;
  margin: 0.7rem 0 0.95rem;
  color: #17324d;
  font-size: clamp(3rem, 7vw, 5.15rem);
  line-height: 0.99;
  letter-spacing: -0.05em;
}

.ex-subtitle {
  max-width: 800px;
  margin: 0;
  color: #5f6d75;
  font-size: 1.15rem;
  line-height: 1.7;
}

.ex-source-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.ex-visual-section {
  padding-top: 3rem;
}

.ex-visual-frame {
  padding: 1rem;
  background: #ffffff;
  border: 1px solid #dfe6e7;
  border-radius: 24px;
  box-shadow: 0 18px 38px rgba(23, 50, 77, 0.08);
}

.ex-visual-frame img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 17px;
}

.ex-summary-section {
  padding-top: 2rem;
}

.ex-summary-card {
  padding: 1.65rem 1.75rem;
  background:
    radial-gradient(circle at 92% 16%, rgba(47, 113, 115, 0.08), transparent 26%),
    linear-gradient(145deg, #ffffff, #f7faf9);
  border: 1px solid #dfe6e7;
  border-left: 5px solid #2f7173;
  border-radius: 0 18px 18px 0;
  box-shadow: 0 10px 26px rgba(23, 50, 77, 0.05);
}

.ex-summary-card p:last-child {
  margin: 0.8rem 0 0;
  color: #44535b;
  font-size: 1.04rem;
  line-height: 1.8;
}

.ex-source-note {
  display: grid;
  grid-template-columns: minmax(360px, 1fr) auto;
  gap: 1.5rem;
  align-items: center;
  margin: 3.2rem 0 1rem;
  padding: 2.2rem;
  background:
    radial-gradient(circle at 88% 12%, rgba(255,255,255,0.1), transparent 24%),
    linear-gradient(120deg, #17324d, #2f7173);
  border-radius: 24px;
  box-shadow: 0 18px 45px rgba(23, 50, 77, 0.18);
}

.ex-source-note .ex-summary-label {
  color: #bfe1df;
}

.ex-source-note h2 {
  margin: 0.5rem 0 0.8rem;
  color: #ffffff;
  font-size: clamp(1.7rem, 3vw, 2.3rem);
}

.ex-source-note p {
  margin: 0;
  color: rgba(255,255,255,0.82);
  line-height: 1.75;
}

.ex-source-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.ex-source-actions .btn-outline-primary {
  color: #ffffff;
  border-color: rgba(255,255,255,0.74);
}

.ex-source-actions .btn-outline-primary:hover {
  color: #17324d;
  background: #ffffff;
  border-color: #ffffff;
}

@media (max-width: 800px) {
  .ex-source-note {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 650px) {
  .ex-container {
    width: min(100% - 2rem, 1040px);
  }

  .ex-hero {
    padding: 3.8rem 0 3.4rem;
  }

  .ex-hero h1 {
    font-size: 3rem;
  }

  .ex-summary-card,
  .ex-source-note,
  .ex-visual-frame {
    padding: 1.2rem;
  }

  .ex-source-links .btn,
  .ex-source-actions .btn {
    width: 100%;
  }
}