/**
 * Octopus KSA — Transitions, Ink Overlay & Fullscreen 8-Arms Modal
 * High-performance, Hardware-accelerated, WCAG 2.1 AA compliant.
 */

/* 1. Fullscreen Arms Navigation Overlay */
.oct-arms-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  color: #0F172A;
  display: flex;
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
  transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.4s ease;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.oct-arms-modal.is-open {
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
}

/* Modal Header Bar */
.oct-arms-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem clamp(1.5rem, 4vw, 3.5rem);
  border-block-end: 1px solid #E2E8F0;
  position: sticky;
  top: 0;
  z-index: 20;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
}

.oct-arms-modal-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--paper);
  margin: 0;
}

.oct-arms-modal-title .oct-tag {
  background: rgba(240, 88, 40, 0.2);
  color: var(--accent);
  border: 1px solid rgba(240, 88, 40, 0.4);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.oct-arms-close-btn {
  background: rgba(244, 239, 230, 0.08);
  border: 1px solid rgba(244, 239, 230, 0.2);
  color: var(--paper);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.5rem;
  line-height: 1;
  transition: all var(--duration-fast) var(--ease-out);
}

.oct-arms-close-btn:hover,
.oct-arms-close-btn:focus-visible {
  background: var(--accent);
  color: var(--deep);
  border-color: var(--accent);
  transform: rotate(90deg);
}

/* Modal Content & Anatomy Stage */
.oct-arms-modal-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 2.5rem clamp(1.5rem, 4vw, 3.5rem);
  max-width: 1400px;
  margin-inline: auto;
  width: 100%;
}

/* 3 Hearts Hub */
.oct-hearts-hub {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-block-end: 3rem;
}

.oct-heart-card {
  background: rgba(32, 40, 96, 0.45);
  border: 1px solid rgba(120, 168, 208, 0.2);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  position: relative;
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}

.oct-heart-card:hover {
  border-color: var(--accent);
  background: rgba(32, 40, 96, 0.7);
  transform: translateY(-2px);
}

.oct-heart-pulse {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: rgba(240, 88, 40, 0.15);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  flex-shrink: 0;
  position: relative;
}

.oct-heart-pulse::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: inherit;
  border: 1.5px solid var(--accent);
  opacity: 0.6;
  animation: octHeartbeat 1.8s ease-in-out infinite;
}

@keyframes octHeartbeat {
  0% { transform: scale(1); opacity: 0.6; }
  14% { transform: scale(1.18); opacity: 0.9; }
  28% { transform: scale(1); opacity: 0.6; }
  42% { transform: scale(1.12); opacity: 0.8; }
  70% { transform: scale(1); opacity: 0.4; }
  100% { transform: scale(1); opacity: 0.6; }
}

.oct-heart-info h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
  margin: 0 0 0.25rem 0;
}

.oct-heart-info p {
  font-size: 0.825rem;
  color: rgba(244, 239, 230, 0.75);
  margin: 0;
  line-height: 1.4;
}

/* 8 Arms Grid */
.oct-arms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.oct-arm-tile {
  background: rgba(32, 40, 96, 0.35);
  border: 1px solid rgba(120, 168, 208, 0.18);
  border-radius: var(--radius-md);
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
  color: var(--paper);
  position: relative;
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
  min-height: 230px;
}

.oct-arm-tile::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(240, 88, 40, 0.15), transparent 70%);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.oct-arm-tile:hover,
.oct-arm-tile:focus-visible {
  border-color: var(--accent);
  background: rgba(32, 40, 96, 0.65);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}

.oct-arm-tile:hover::before {
  opacity: 1;
}

.oct-arm-tile-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-block-end: 1rem;
  position: relative;
  z-index: 1;
}

.oct-arm-tile-num {
  font-family: var(--font-mono);
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(240, 88, 40, 0.12);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.oct-arm-tile-heart {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(244, 239, 230, 0.65);
}

.oct-arm-tile-title {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
  margin: 0 0 0.5rem 0;
  position: relative;
  z-index: 1;
}

.oct-arm-tile-desc {
  font-size: 0.85rem;
  line-height: 1.6;
  color: rgba(244, 239, 230, 0.72);
  margin: 0 0 1rem 0;
  position: relative;
  z-index: 1;
  flex: 1;
}

.oct-arm-tile-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  position: relative;
  z-index: 1;
  transition: transform var(--duration-fast) var(--ease-out);
}

.oct-arm-tile:hover .oct-arm-tile-cta {
  transform: translateX(-4px);
}

html[dir="ltr"] .oct-arm-tile:hover .oct-arm-tile-cta {
  transform: translateX(4px);
}

/* 2. Header Arms Trigger Button */
.oct-arms-trigger-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(240, 88, 40, 0.1);
  border: 1px solid rgba(240, 88, 40, 0.3);
  color: var(--accent-text);
  padding: 0.45rem 0.95rem;
  border-radius: var(--radius-full);
  font-family: var(--font-base);
  font-size: 0.875rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.oct-arms-trigger-btn:hover,
.oct-arms-trigger-btn:focus-visible {
  background: var(--accent);
  color: var(--deep);
  border-color: var(--accent);
  box-shadow: 0 4px 14px rgba(240, 88, 40, 0.3);
  transform: translateY(-1px);
}

.oct-arms-badge {
  font-family: var(--font-mono);
  font-size: 0.725rem;
  background: var(--accent);
  color: var(--deep);
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-full);
  font-weight: 700;
}

.oct-arms-trigger-btn:hover .oct-arms-badge {
  background: var(--deep);
  color: var(--paper);
}

/* 3. Sound Toggle Button */
.oct-sound-toggle {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.oct-sound-toggle:hover,
.oct-sound-toggle:focus-visible {
  border-color: var(--accent);
  color: var(--accent-text);
  background: rgba(240, 88, 40, 0.08);
}

.oct-sound-toggle.is-active {
  background: var(--accent);
  color: var(--deep);
  border-color: var(--accent);
}

/* 4. Gooey Ink Splash Page Transitions */
.oct-ink-overlay {
  position: fixed;
  inset: 0;
  z-index: 99999;
  pointer-events: none;
  overflow: hidden;
  visibility: hidden;
}

.oct-ink-overlay.is-splashing {
  visibility: visible;
  pointer-events: auto;
}

.oct-ink-cloud {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 140vmax;
  height: 140vmax;
  filter: url(#oct-goo);
  opacity: 0;
}

.oct-ink-drop {
  position: absolute;
  border-radius: var(--radius-full);
  background-color: var(--deep);
  transform: scale(0);
}

.oct-ink-overlay.is-splashing .oct-ink-drop {
  animation: octInkDropExpand 0.75s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes octInkDropExpand {
  0% {
    transform: scale(0);
    opacity: 0.7;
  }
  50% {
    transform: scale(1);
    opacity: 1;
  }
  100% {
    transform: scale(1.6);
    opacity: 1;
  }
}

/* Reduced Motion Fallback */
@media (prefers-reduced-motion: reduce) {
  .oct-arms-modal {
    transition: none !important;
  }
  .oct-heart-pulse::after {
    animation: none !important;
  }
  .oct-ink-overlay.is-splashing .oct-ink-drop {
    animation: none !important;
  }
  .oct-ink-overlay.is-splashing {
    background-color: var(--deep);
    opacity: 0.95;
    transition: opacity 0.2s ease;
  }
}

/* 5. Responsive Breakpoints */
@media (max-width: 1100px) {
  .oct-arms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .oct-hearts-hub {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .oct-arms-grid {
    grid-template-columns: 1fr;
  }
  .oct-arms-modal-header {
    padding: 1rem 1.25rem;
  }
  .oct-arms-modal-content {
    padding: 1.5rem 1.25rem;
  }
}