/* Source Coins — Technical Diagram Exhibits & Modal System */

:root {
  --exhibit-bg: rgba(7, 10, 16, 0.92);
  --exhibit-border: rgba(255, 255, 255, 0.1);
  --exhibit-border-hover: rgba(51, 210, 255, 0.45);
  --exhibit-radius: 0.75rem;
}

/* Exhibit Card */
.diagram-exhibit {
  position: relative;
  background: var(--exhibit-bg);
  border: 1px solid var(--exhibit-border);
  border-radius: var(--exhibit-radius);
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 16px 40px -12px rgba(0, 0, 0, 0.75);
}

.diagram-exhibit:hover {
  border-color: var(--exhibit-border-hover);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12), 0 20px 48px -10px rgba(51, 210, 255, 0.12), 0 8px 24px rgba(0, 0, 0, 0.9);
  transform: translateY(-2px);
}

/* Preview Frame */
.diagram-preview-surface {
  position: relative;
  width: 100%;
  background: #050505;
  border-radius: 0.5rem;
  overflow: hidden;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.diagram-preview-surface svg,
.diagram-preview-surface img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  transition: transform 0.4s ease;
}

.diagram-exhibit:hover .diagram-preview-surface svg,
.diagram-exhibit:hover .diagram-preview-surface img {
  transform: scale(1.008);
}

/* Hover Action Badge */
.diagram-hover-action {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(51, 210, 255, 0.08) 0%, rgba(0, 0, 0, 0.6) 80%);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}

.diagram-exhibit:hover .diagram-hover-action,
.diagram-preview-surface:focus-visible .diagram-hover-action {
  opacity: 1;
}

.diagram-cta-btn {
  background: rgba(5, 10, 20, 0.9);
  border: 1px solid rgba(51, 210, 255, 0.6);
  color: #ffffff;
  padding: 0.5rem 1.1rem;
  border-radius: 0.375rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 4px 16px rgba(51, 210, 255, 0.25);
  transform: translateY(4px);
  transition: transform 0.25s ease, background-color 0.2s;
}

.diagram-exhibit:hover .diagram-cta-btn {
  transform: translateY(0);
}

.diagram-cta-btn:hover {
  background: rgba(51, 210, 255, 0.2);
}

/* Modal Lightbox */
.diagram-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.diagram-modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.diagram-modal-container {
  width: 95vw;
  max-width: 1440px;
  height: 92vh;
  max-height: 960px;
  background: #070a12;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 0.875rem;
  display: flex;
  flex-direction: column;
  box-shadow: 0 25px 60px -12px rgba(0, 0, 0, 0.95), 0 0 40px rgba(51, 210, 255, 0.15);
  overflow: hidden;
  transform: scale(0.97);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.diagram-modal-overlay.active .diagram-modal-container {
  transform: scale(1);
}

.diagram-modal-header {
  padding: 0.875rem 1.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0, 0, 0, 0.4);
}

.diagram-modal-body {
  flex: 1;
  min-height: 0;
  position: relative;
  background: #050505;
}

.diagram-modal-body iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

.diagram-modal-footer {
  padding: 0.875rem 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.6);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .diagram-modal-footer {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    padding: 0.75rem;
  }
}