/* ============ DISCIPLINES FOLDER OVERLAY STACK ============ */
.disciplines-section-outer {
  position: relative;
  width: 100%;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  padding: 8rem 0;
}

.disciplines-split-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 4rem;
  margin-top: 7rem;
  width: 100%;
}

.disciplines-left {
  flex: 0 0 42%;
  max-width: 42%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.disciplines-right {
  flex: 0 0 52%;
  max-width: 52%;
}

.folder-container {
  position: relative;
  width: 100%;
  max-width: 400px;
  height: 440px;
  margin: 0 auto;
}

.folder-back {
  position: absolute;
  top: 30px;
  bottom: 0;
  left: 0;
  right: 0;
  background: #111111;
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 20px;
  z-index: 1;
}

.folder-cards-stack {
  position: absolute;
  inset: 0;
  z-index: 2;
}

.folder-front {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 52%;
  background: #1a1a1a;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-left: 1px solid rgba(255, 255, 255, 0.05);
  border-right: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 0 0 20px 20px;
  z-index: 5;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), 0 -10px 30px rgba(0, 0, 0, 0.3);
}

.folder-front::before {
  content: '';
  position: absolute;
  top: -16px;
  left: 0;
  height: 16px;
  width: 130px;
  background: #1a1a1a;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-left: 1px solid rgba(255, 255, 255, 0.05);
  border-right: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px 12px 0 0;
}

.folder-card {
  position: absolute;
  bottom: 25px;
  left: 5%;
  width: 90%;
  height: 350px;
  background: #1e1e1e;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
  transform-origin: bottom center;
  will-change: transform, opacity;
  transition:
    transform 0.6s cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 0.6s ease,
    border-color 0.4s ease,
    opacity 0.4s ease;
}

.folder-card .card-peek {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.06);
  padding-bottom: 1rem;
}

.folder-card .card-num {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  font-weight: 500;
}

.folder-card .card-inner-body {
  flex-grow: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--fg-3);
  transition: color 0.3s ease;
}

.folder-card .card-graphic {
  width: 100%;
  height: 220px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.07);
  overflow: hidden;
  position: relative;
  color: var(--fg-3);
  transition: all 0.3s ease;
}

.folder-card .card-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  opacity: 0.72;
  transition: opacity 0.3s ease, transform 0.4s ease;
}

.folder-card .card-thumb-icon {
  position: absolute;
  bottom: 8px;
  right: 8px;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(10, 10, 10, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--fg-2);
  transition: all 0.3s ease;
}

.folder-card:first-child { z-index: 2; transform: translateY(6px) rotate(-6.1deg); }
.folder-card:nth-child(even) { z-index: 3; transform: translateY(6px) rotate(-6.1deg); }
.folder-card:nth-child(odd) { z-index: 3; transform: translateY(0) rotate(3.5deg); }
.folder-card:last-child { z-index: 4; transform: translateY(0) rotate(3.5deg); }

.active-1 .folder-card:first-child {
  z-index: 6;
  transform: translateY(-130px) rotate(0deg);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.6);
  border-color: var(--accent);
}
.active-1 .folder-card:first-child .card-graphic { border-color: rgba(165, 243, 161, 0.35); }
.active-1 .folder-card:first-child .card-thumb { opacity: 1; transform: scale(1.04); }

.active-2 .folder-card:nth-child(even) {
  z-index: 6;
  transform: translateY(-130px) rotate(0deg);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.6);
  border-color: var(--accent);
}
.active-2 .folder-card:nth-child(even) .card-graphic { border-color: rgba(165, 243, 161, 0.35); }
.active-2 .folder-card:nth-child(even) .card-thumb { opacity: 1; transform: scale(1.04); }

.active-3 .folder-card:last-child {
  z-index: 6;
  transform: translateY(-130px) rotate(0deg);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.6);
  border-color: var(--accent);
}
.active-3 .folder-card:last-child .card-graphic { border-color: rgba(165, 243, 161, 0.35); }
.active-3 .folder-card:last-child .card-thumb { opacity: 1; transform: scale(1.04); }

.detail-panel {
  position: relative;
  width: 100%;
  height: 380px;
}

.detail-content {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  opacity: 0;
  visibility: hidden;
  transform: translateY(28px);
  transition:
    opacity 0.5s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.5s cubic-bezier(0.22, 1, 0.36, 1),
    visibility 0s linear 0.5s;
}


.detail-content .btn {
  margin-top: 22px;
}

.detail-eyebrow {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.detail-title {
  font-size: clamp(2rem, 3.5vw, 2.5rem);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0.75rem 0 1.25rem;
  color: var(--fg);
}

.detail-desc {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--fg-2);
  margin-bottom: 2rem;
}

.active-1 .detail-content-1,
.active-2 .detail-content-2,
.active-3 .detail-content-3 {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition:
    opacity 0.5s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.5s cubic-bezier(0.22, 1, 0.36, 1),
    visibility 0s linear 0s;
}

.active-2 .detail-content-1,
.active-3 .detail-content-1,
.active-3 .detail-content-2 {
  opacity: 0;
  visibility: hidden;
  transform: translateY(-30px);
}

/* ============ DISCIPLINES VERTICAL SPINE TIMELINE ============ */
.spine-container {
  position: relative;
  width: 100%;
  max-width: 900px;
  margin: 5rem auto 2rem;
  padding: 2rem 0;
}

.spine-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: rgba(255, 255, 255, 0.15);
  transform: translateX(-50%);
  z-index: 1;
}

.spine-item {
  position: relative;
  width: 100%;
  display: flex;
  margin-bottom: 120px;
}

.spine-item:last-child {
  margin-bottom: 0;
}

.spine-dot {
  position: absolute;
  left: 50%;
  top: 0.43rem;
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 2;
  box-shadow: 0 0 10px rgba(165, 243, 161, 0.5);
}

.spine-content {
  width: 50%;
  display: flex;
  flex-direction: column;
  position: relative;
}

.spine-content::after {
  content: '';
  position: absolute;
  top: 0.43rem;
  height: 1px;
  background: rgba(255, 255, 255, 0.15);
  z-index: 1;
  transition: opacity 0.45s ease-out, transform 0.45s ease-out;
}

.spine-category {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--fg-3);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  line-height: 1.2;
}

.spine-value {
  font-size: clamp(2rem, 3.5vw, 2.5rem);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0.5rem 0 0.85rem;
  color: white;
}

.spine-desc {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--fg-2);
  max-width: 320px;
}

.spine-item-left { justify-content: flex-start; text-align: right; }
.spine-item-left .spine-content {
  padding-right: 5.2rem;
  padding-left: 0;
  align-items: flex-end;
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.45s ease-out, transform 0.45s ease-out;
}
.spine-item-left .spine-content::after { right: 0; left: auto; width: 4rem; }

.spine-item-right { justify-content: flex-end; text-align: left; }
.spine-item-right .spine-content {
  padding-left: 5.2rem;
  padding-right: 0;
  align-items: flex-start;
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.45s ease-out, transform 0.45s ease-out;
}
.spine-item-right .spine-content::after { left: 0; right: auto; width: 4rem; }

.spine-item.visible .spine-content { opacity: 1; transform: translateX(0); }
.spine-item.visible .spine-dot { transform: translate(-50%, -50%) scale(1); }

/* ============ BREAKPOINT FALLBACKS ============ */
@media (max-width: 1024px) {
  .disciplines-section-outer { min-height: auto; padding: 8rem 0; }
  .disciplines-split-wrapper { flex-direction: column; gap: 0; margin-top: 2rem; }
  .disciplines-left { display: none; }
  .disciplines-right { flex: 0 0 100%; max-width: 100%; width: 100%; }
  .detail-panel { display: flex; flex-direction: column; gap: 0; height: auto; }
  
  .detail-content {
    position: relative;
    top: auto;
    left: auto;
    opacity: 1 !important;
    visibility: visible !important;
    transform: none !important;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 2rem 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  }
  .detail-content:last-of-type { margin-bottom: 0; }
}

@media (max-width: 768px) {
  .spine-container { margin-top: 3rem; padding: 1rem 0; }
  .spine-line { left: 15px; transform: none; }
  .spine-item { margin-bottom: 60px; justify-content: flex-start !important; text-align: left !important; }
  .spine-content { width: 100% !important; padding-left: 2.25rem !important; padding-right: 0 !important; align-items: flex-start !important; }
  .spine-item-left .spine-content::after,
  .spine-item-right .spine-content::after { left: 0 !important; right: auto !important; width: 2.25rem !important; top: 0.43rem !important; }
  .spine-dot { left: 15px !important; top: 0.43rem !important; }
  .spine-desc { max-width: 100%; }
  .spine-item-left .spine-content { transform: translateX(30px); }
}