/* assets/css/bifurcation.css */

/* ===== Section layout ===== */
.bifurcation {
  padding: var(--space-2xl) var(--content-padding);
  max-width: var(--content-max);
  margin: 0 auto;
}

.bifurcation__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

/* ===== Portal card base ===== */
.portal-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: var(--space-xl) var(--space-lg);
  cursor: pointer;
  overflow: hidden;
  transform-style: preserve-3d;
  will-change: transform;
  transition:
    box-shadow 0.4s var(--ease-standard),
    border-color 0.4s var(--ease-standard);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 400px;
  justify-content: center;
}

.portal-card:hover {
  box-shadow:
    0 4px 8px rgba(46, 31, 74, 0.04),
    0 12px 30px rgba(139, 107, 191, 0.08),
    0 30px 80px rgba(139, 107, 191, 0.06);
  border-color: var(--border-strong);
}

/* ===== Decorative concentric rings ===== */
.portal-card__rings {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.06;
  background:
    radial-gradient(
      circle at center,
      transparent 19%,
      var(--purpura-pale) 20%,
      transparent 21%
    ),
    radial-gradient(
      circle at center,
      transparent 34%,
      var(--purpura-pale) 35%,
      transparent 36%
    ),
    radial-gradient(
      circle at center,
      transparent 49%,
      var(--purpura-pale) 50%,
      transparent 51%
    );
}

/* ===== Icon ===== */
.portal-card__icon {
  width: 80px;
  height: 80px;
  margin-bottom: var(--space-lg);
}

.portal-card__icon svg {
  width: 100%;
  height: 100%;
}

/* ===== Title ===== */
.portal-card__title {
  font-family: var(--serif);
  font-weight: 300;
  font-size: var(--text-h1);
  color: var(--text-primary);
  transition: color 0.4s var(--ease-standard);
}

.portal-card__title em {
  font-style: italic;
}

.portal-card:hover .portal-card__title {
  color: var(--purpura-text-safe);
}

/* ===== Accent line ===== */
.portal-card__accent {
  width: 40px;
  height: 2px;
  background: linear-gradient(to right, var(--dourado), var(--dourado-light));
  margin: var(--space-md) auto;
  transition: width 0.5s ease-out;
}

.portal-card:hover .portal-card__accent {
  width: 80px;
}

/* ===== Description ===== */
.portal-card__desc {
  font-family: var(--sans);
  font-weight: 300;
  font-size: var(--text-body);
  color: var(--text-secondary);
  max-width: 320px;
  margin-bottom: var(--space-lg);
}

.portal-card__desc em {
  font-style: italic;
  color: var(--text-primary);
}

/* ===== CTA ===== */
.portal-card__cta {
  font-family: var(--sans);
  font-weight: 500;
  font-size: var(--text-caption);
  color: var(--dourado-text-safe);
  letter-spacing: 0.04em;
  transition: color 0.3s var(--ease-standard);
}

.portal-card__cta::after {
  content: " →";
  display: inline-block;
  transition: transform 0.3s var(--ease-standard);
}

.portal-card:hover .portal-card__cta {
  color: var(--dourado-text-safe);
}

.portal-card:hover .portal-card__cta::after {
  transform: translateX(4px);
}

/* ===== Accessibility ===== */
.portal-card:focus-visible {
  outline: 2px solid var(--purpura);
  outline-offset: 4px;
}

/* ===== Fading out state ===== */
.portal-card.fading-out {
  opacity: 0;
  filter: blur(4px);
  transform: scale(0.97);
  transition:
    opacity 0.3s var(--ease-standard),
    filter 0.3s var(--ease-standard),
    transform 0.3s var(--ease-standard);
  pointer-events: none;
}

/* ===== Responsive ===== */
@media (max-width: 767px) {
  .bifurcation__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .portal-card {
    min-height: 300px;
    padding: var(--space-lg);
  }
}

/* ===== Particles canvas dimmed state ===== */
#particles-canvas.dimmed {
  opacity: 0.3;
  transition: opacity 0.4s var(--ease-standard);
}

/* ===== Tunnel overlay ===== */
.tunnel-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s var(--ease-standard);
}

.tunnel-overlay.active {
  pointer-events: all;
  opacity: 1;
}

.tunnel-overlay__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(46, 31, 74, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* ===== Tunnel rings animation ===== */
.tunnel-overlay__rings {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.tunnel-overlay__rings.pulsing {
  animation: tunnelPulse 0.6s ease-out forwards;
}

.tunnel-overlay__rings::before,
.tunnel-overlay__rings::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px solid rgba(139, 107, 191, 0.4);
}

.tunnel-overlay__rings::before {
  width: 60vmax;
  height: 60vmax;
  border-color: rgba(139, 107, 191, 0.25);
}

.tunnel-overlay__rings::after {
  width: 90vmax;
  height: 90vmax;
  border-color: rgba(139, 107, 191, 0.12);
}

@keyframes tunnelPulse {
  0% {
    width: 0;
    height: 0;
    opacity: 0.8;
  }
  50% {
    width: 120vmax;
    height: 120vmax;
    opacity: 0.3;
  }
  100% {
    width: 150vmax;
    height: 150vmax;
    opacity: 0;
  }
}

/* ===== Expanded content container ===== */
.expanded-content {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.expanded-content[hidden] {
  display: none;
}

/* ===== Close button ===== */
.expanded-content__close {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 10;
  width: 48px;
  height: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    background 0.2s var(--ease-standard),
    border-color 0.2s var(--ease-standard),
    transform 0.2s var(--ease-standard);
  flex-shrink: 0;
}

.expanded-content__close:hover {
  background: var(--bg-subtle, var(--nevoa-deep));
  border-color: var(--border-strong);
  transform: scale(1.05);
}

.expanded-content__close:focus-visible {
  outline: 2px solid var(--purpura);
  outline-offset: 3px;
}

.expanded-content__close svg {
  width: 20px;
  height: 20px;
  stroke: var(--text-secondary);
  flex-shrink: 0;
}

/* ===== Expanded content body ===== */
.expanded-content__body {
  background: var(--bg-card);
  border-radius: 20px;
  width: 90vw;
  max-width: 800px;
  max-height: 85vh;
  overflow-y: auto;
  padding: var(--space-xl);
  box-shadow:
    0 8px 32px rgba(46, 31, 74, 0.2),
    0 32px 80px rgba(46, 31, 74, 0.15);
  opacity: 0;
  transform: scale(0.95);
  transition:
    opacity 0.4s var(--ease-standard) 0.3s,
    transform 0.4s var(--ease-standard) 0.3s;
  position: relative;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.expanded-content.entering .expanded-content__body {
  opacity: 1;
  transform: scale(1);
}

.expanded-content__body::-webkit-scrollbar {
  width: 6px;
}

.expanded-content__body::-webkit-scrollbar-track {
  background: transparent;
}

.expanded-content__body::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

/* ===== Expanded content inner typography ===== */
.expanded-content__body h2 {
  font-family: var(--serif);
  font-weight: 300;
  font-style: italic;
  font-size: var(--text-h1);
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  line-height: 1.2;
}

.expanded-content__body p {
  font-family: var(--sans);
  font-weight: 300;
  font-size: var(--text-body);
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-md);
}

.expanded-content__body p:last-child {
  margin-bottom: 0;
}

.expanded-content__body em {
  font-style: italic;
  color: var(--text-primary);
}

/* ===== History section ===== */
.history-section {
  margin-top: var(--space-xl);
  border-top: 1px solid var(--border);
  padding-top: var(--space-lg);
}

.history-toggle {
  font-family: var(--serif);
  font-style: italic;
  font-size: var(--text-h3);
  color: var(--purpura-text-safe);
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0;
  width: 100%;
  text-align: left;
  transition: color 0.2s var(--ease-standard);
}

.history-toggle:hover {
  color: var(--purpura-text);
}

.history-toggle:focus-visible {
  outline: 2px solid var(--purpura);
  outline-offset: 3px;
  border-radius: 3px;
}

.history-toggle .arrow {
  display: inline-block;
  transition: transform 0.3s var(--ease-standard);
  font-style: normal;
  font-size: var(--text-body-sm);
  color: var(--purpura-light, var(--purpura));
  flex-shrink: 0;
}

.history-section.open .history-toggle .arrow {
  transform: rotate(90deg);
}

/* ===== History expandable body ===== */
.history-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.5s var(--ease-standard);
}

.history-section.open .history-body {
  grid-template-rows: 1fr;
}

.history-inner {
  overflow: hidden;
  opacity: 0;
  transform: translateY(-8px);
  transition:
    opacity 0.4s var(--ease-standard) 0.1s,
    transform 0.4s var(--ease-standard) 0.1s;
}

.history-section.open .history-inner {
  opacity: 1;
  transform: translateY(0);
}

.history-inner > * {
  padding-top: var(--space-md);
}

/* ===== Clickable names ===== */
.clickable-name {
  font-family: var(--serif);
  font-weight: 400;
  font-style: italic;
  color: var(--purpura-text-safe);
  cursor: pointer;
  border-bottom: 1px solid rgba(139, 107, 191, 0.3);
  transition:
    color 0.2s var(--ease-standard),
    border-color 0.2s var(--ease-standard);
}

.clickable-name:hover {
  color: var(--purpura-text);
  border-color: var(--purpura);
}

/* ===== References ===== */
.references {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
}

.references h3 {
  font-family: var(--sans);
  font-weight: 500;
  font-size: var(--text-caption);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary, var(--text-secondary));
  margin-bottom: var(--space-md);
}

.references ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.references li {
  font-family: var(--mono);
  font-size: var(--text-caption);
  color: var(--text-tertiary, var(--text-secondary));
  line-height: 1.6;
}

.ref-author {
  font-weight: 500;
}

/* ===== Responsive — expanded content ===== */
@media (max-width: 767px) {
  .expanded-content {
    padding: 0;
  }

  .expanded-content__body {
    width: 100vw;
    max-width: 100vw;
    max-height: 100dvh;
    border-radius: 0;
    padding: calc(var(--space-xl) + 48px) var(--space-lg) var(--space-xl);
  }

  .expanded-content__close {
    top: var(--space-md);
    right: var(--space-md);
  }
}