/* ============ COMMON EXPERTISE LAYOUT ============ */

.expertise-head {
  position: relative;
  display: block;
  margin-bottom: 1rem;
}

/* ============ EXPERTISE VERTICAL SPLIT PANEL ============ */
#expertise-vertical-section {
  position: relative;
  height: 220vh;
}

#expertise-vertical-section .expertise-sticky-wrapper {
  position: sticky;
  top: -40px;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  padding-top: 80px;
}

.expertise-vertical-split {
  display: flex;
  gap: 4rem;
  align-items: stretch;
  margin-top: 3.1rem;
  height: 520px;
}

.expertise-left-panel {
  flex: 0 0 40%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
}

.expertise-right-panel {
  flex: 0 0 60%;
  position: relative;
  display: flex;
  align-items: stretch;
}

.expertise-vertical-item {
  padding: 1.5rem 2rem;
  border-left: 3px solid var(--line);
  opacity: 0.4;
  transform: scale(0.96);
  transform-origin: left center;
  transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
  cursor: pointer;
  background: rgba(255, 255, 255, 0.01);
  border-radius: 0 8px 8px 0;
}

.expertise-vertical-item:hover:not(.active) {
  opacity: 0.7;
  background: rgba(255, 255, 255, 0.02);
}

.expertise-vertical-item.active {
  opacity: 1;
  transform: scale(1.06);
  border-left-color: var(--accent);
  background: rgba(110, 231, 183, 0.03);
}

.evt-num {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.evt-title {
  font-size: 1.35rem;
  font-weight: 600;
  margin: 0;
  color: var(--fg-3);
  transition: color 0.4s ease;
}

.expertise-vertical-item.active .evt-title {
  color: #fff;
}

.expertise-detail-card {
  position: relative;
  width: 100%;
  height: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.02);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  padding: 3rem;
  overflow: hidden;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
}

.evt-detail-block {
  position: absolute;
  top: 3rem;
  left: 3rem;
  right: 3rem;
  bottom: 3rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.25, 1, 0.5, 1), visibility 0.5s ease;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-decoration: none;
  color: inherit;
}

.evt-detail-block.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.evt-problem-headline {
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1.3;
  color: #fff;
  margin-bottom: 0.75rem;
}

.evt-bridge-line {
  font-size: 1.05rem;
  color: var(--accent);
  margin-bottom: 1.5rem;
  font-style: italic;
}

.evt-detail-title {
  font-size: 1rem;
  font-family: var(--mono);
  color: var(--fg-3);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.evt-detail-desc {
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--fg-2);
  margin-bottom: 2rem;
}

.evt-detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: auto;
}

.evt-detail-tags span {
  font-size: 0.8rem;
  font-family: var(--mono);
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  color: var(--fg-2);
}

.evt-detail-tags span.highlight {
  background: rgba(110, 231, 183, 0.08);
  border-color: rgba(110, 231, 183, 0.2);
  color: var(--accent);
}

/* ============ ACCORDION SPACING UNIFICATION ============ */
.section--expertise-vertical {
  padding-top: 6rem !important;
  padding-bottom: 6rem !important;
}

/* ============ RESPONSIVE LAYOUTS ============ */
@media (max-width: 1080px) {
  #expertise-vertical-section {
    height: auto !important;
  }
  #expertise-vertical-section .expertise-sticky-wrapper {
    position: relative !important;
    height: auto !important;
    padding: 0 !important;
    overflow: visible;
  }
  .expertise-vertical-split {
    flex-direction: column;
    height: auto !important;
    gap: 0;
  }
  .expertise-left-panel {
    display: none !important;
  }
  .expertise-right-panel {
    width: 100% !important;
    min-height: auto !important;
  }
  .expertise-detail-card {
    display: flex !important;
    flex-direction: column !important;
    gap: 2rem !important;
    padding: 0 !important;
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    height: auto !important;
    min-height: auto !important;
    overflow: visible !important;
  }
  .evt-detail-block {
    position: relative !important;
    top: auto !important;
    left: auto !important;
    right: auto !important;
    bottom: auto !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: none !important;
    display: flex !important;
    pointer-events: auto !important;
    
    border: 0px solid var(--line);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    border-radius: 0;
    background: transparent;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    padding: 3rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  }
}

@media (max-width: 768px) {
  .evt-detail-block {
    padding: 2rem 1.5rem !important;
  }
  .evt-problem-headline {
    font-size: 1.45rem !important;
  }
}