/* Business Research Frameworks - Two-column format (content left, image right) */

body {
  background: #ffffff;
}

.brf-hero {
  position: relative;
  padding: 4rem 2.5rem 3rem;
  border-bottom: 1px solid rgba(26, 43, 94, 0.08);
  background-image: url('https://images.unsplash.com/photo-1531297484001-80022131f5a1?auto=format&fit=crop&w=1920');
  background-size: cover;
  background-position: center;
}

.brf-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(26, 43, 94, 0.35) 0%,
    rgba(19, 29, 66, 0.3) 50%,
    rgba(26, 43, 94, 0.32) 100%
  );
  z-index: 0;
  pointer-events: none;
}

.brf-hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3rem;
  max-width: 1200px;
  margin: 0 auto;
}

.brf-hero-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.brf-hero-title {
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
  line-height: 1.2;
  text-align: center;
}

.brf-hero-description {
  font-size: 1.15rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.92);
  text-align: center;
}

/* Main - framework blocks */
.brf-main {
  background: #ffffff;
  padding: 0;
  max-width: 1400px;
  margin: 0 auto;
}

/* Two-column layout per framework block - all in one plane */
.brf-framework-block {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 4rem;
  align-items: center;
  padding: 4rem 2.5rem 5rem;
  border-bottom: 1px solid rgba(26, 43, 94, 0.08);
}

.brf-framework-block:last-child {
  border-bottom: none;
}

/* Left column - content */
.brf-block-content {
  max-width: 560px;
}

.brf-block-title {
  font-size: var(--subheading-font-size);
  font-weight: 700;
  color: #1a2b5e;
  margin: 0 0 1rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.brf-block-intro {
  font-size: 1.1rem;
  line-height: 1.65;
  color: #4a5568;
  margin: 0 0 2rem;
}

/* Accordions - light blue cards, rounded */
.brf-accordions {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.brf-accordion {
  background: #e8f4fc;
  border-radius: 12px;
  border: 1px solid rgba(26, 43, 94, 0.06);
  overflow: hidden;
}

.brf-accordion-summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: #1a2b5e;
  letter-spacing: 0.02em;
}

.brf-accordion-summary::-webkit-details-marker {
  display: none;
}

.brf-accordion-summary::after {
  content: ' ▾';
  margin-left: auto;
  font-size: 0.85em;
  opacity: 0.6;
}

.brf-accordion[open] .brf-accordion-summary::after {
  content: ' ▴';
}

.brf-accordion-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: #1a2b5e;
}

.brf-accordion-icon svg {
  width: 100%;
  height: 100%;
}

.brf-accordion-label {
  flex: 1;
}

.brf-accordion-content {
  padding: 0 1.25rem 1.25rem 3.25rem;
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
  color: #4a5568;
}

.brf-accordion[open] .brf-accordion-content {
  padding-top: 0;
  margin-top: -0.5rem;
}

/* Right column - illustration area (light blue bg) */
.brf-block-image {
  position: relative;
  min-height: 360px;
}

.brf-image-placeholder {
  position: absolute;
  inset: 0;
  background: #d4e8f7;
  border-radius: 12px;
  overflow: hidden;
}

.brf-image-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Responsive */
@media (max-width: 1000px) {
  .brf-framework-block {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 3rem 1.5rem 4rem;
  }

  .brf-block-image {
    order: -1;
    min-height: 280px;
  }
}

@media (max-width: 900px) {
  .brf-hero-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 600px) {
  .brf-hero {
    padding: 3rem 1.5rem 2.5rem;
  }

  .brf-hero-inner {
    gap: 2rem;
  }

  .brf-hero-title {
    white-space: normal;
  }

  .brf-framework-block {
    padding: 2.5rem 1.5rem 3rem;
  }

  .brf-block-image {
    min-height: 220px;
  }
}

@media (max-width: 480px) {
  .brf-hero {
    padding: 2rem 1rem 2rem;
  }

  .brf-hero-title {
    font-size: clamp(1.5rem, 5vw, 2rem);
  }

  .brf-hero-description {
    font-size: clamp(0.9rem, 2.5vw, 1rem);
  }

  .brf-framework-block {
    padding: 2rem 1rem 2.5rem;
  }

  .brf-block-image {
    min-height: 180px;
  }

  .brf-block-title {
    font-size: clamp(1.25rem, 4vw, 1.75rem);
  }
}