body {
  font-family: "Inter", sans-serif;
}

/* Language-based visibility */
:lang(pl) .img-pl {
  display: block;
}
:lang(pl) .img-en {
  display: none;
}
:lang(en) .img-pl {
  display: none;
}
:lang(en) .img-en {
  display: block;
}

/* --- GŁÓWNA ANIMACJA MCAS (ZMIANA NA FIOLET + DARK MODE) --- */
.vis-container {
  position: relative;
  height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: radial-gradient(circle at center, #f8fafc 0%, #f1f5f9 100%);
  border-radius: 1.5rem;
  border: 1px solid #e2e8f0;
  transition: background 0.3s, border-color 0.3s;
}

/* Dark Mode dla kontenera wizualizacji */
.dark .vis-container {
  background: radial-gradient(circle at center, #1e293b 0%, #0f172a 100%);
  border-color: #334155;
}

.mast-cell {
  width: 200px;
  height: 200px;
  background: radial-gradient(circle at 30% 30%, #d8b4fe, #9333ea);
  border-radius: 50%;
  position: relative;
  box-shadow: 0 10px 40px -10px rgba(147, 51, 234, 0.5);
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 6px solid #581c87;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nucleus {
  width: 80px;
  height: 80px;
  background: #3b0764;
  border-radius: 50%;
  z-index: 22;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.4);
  position: relative;
}

.receptor {
  position: absolute;
  width: 14px;
  height: 28px;
  background-color: #1e40af;
  border-radius: 8px;
  top: 50%;
  left: 50%;
  margin-top: -14px;
  margin-left: -7px;
  z-index: 19;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.granule {
  position: absolute;
  width: 12px;
  height: 12px;
  background-color: #f3e8ff;
  border: 2px solid #a855f7;
  border-radius: 50%;
  z-index: 21;
  transition: all 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
  pointer-events: none;
}

.diagram-label {
  position: absolute;
  background: rgba(255, 255, 255, 0.95);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  color: #334155;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
  border: 1px solid #e2e8f0;
  pointer-events: none;
  z-index: 30;
  white-space: nowrap;
  transition: background 0.3s, color 0.3s, border-color 0.3s;
}

.dark .diagram-label {
  background: rgba(30, 41, 59, 0.95);
  color: #e2e8f0;
  border-color: #475569;
}

.line-pointer {
  position: absolute;
  background: #94a3b8;
  z-index: 29;
  transform-origin: 0 0;
}

.shockwave {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 4px solid rgba(147, 51, 234, 0.6);
  transform: translate(-50%, -50%) scale(0.9);
  opacity: 0;
  z-index: 10;
  pointer-events: none;
}

.anim-shake {
  animation: shake-hard 0.4s ease-in-out infinite;
}
.anim-explode .shockwave {
  animation: ripple 0.8s ease-out forwards;
}
.anim-explode .mast-cell {
  transform: scale(0.85);
  filter: brightness(1.1) saturate(1.2);
  border-color: #7e22ce;
  box-shadow: 0 0 60px rgba(126, 34, 206, 0.6);
}

.anim-explode ~ .diagram-label,
.anim-explode ~ .line-pointer {
  opacity: 0;
  transition: opacity 0.2s;
}

@keyframes shake-hard {
  0% {
    transform: translate(1px, 1px) rotate(0deg);
  }
  25% {
    transform: translate(-3px, 0px) rotate(2deg);
  }
  50% {
    transform: translate(-1px, 2px) rotate(-2deg);
  }
  75% {
    transform: translate(3px, 1px) rotate(-2deg);
  }
  100% {
    transform: translate(1px, -2px) rotate(-2deg);
  }
}

@keyframes ripple {
  0% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.8;
    border-width: 20px;
  }
  100% {
    transform: translate(-50%, -50%) scale(3.5);
    opacity: 0;
    border-width: 0px;
  }
}

@keyframes dash {
  to {
    stroke-dashoffset: -24;
  }
}
.animate-dash {
  animation: dash 1s linear infinite;
}

.mist-particle {
  position: absolute;
  background: rgba(216, 180, 254, 0.4);
  border-radius: 50%;
  pointer-events: none;
  opacity: 0;
}

/* --- SYMULATOR LUDZIKA (CANVAS) --- */
.spine-container {
  position: relative;
  background: radial-gradient(circle at 50% 50%, #ffffff, #f1f5f9);
  border-radius: 1rem;
  overflow: hidden;
  border: 1px solid #e2e8f0;
  box-shadow: inset 0 0 40px rgba(226, 232, 240, 0.5);
  display: flex;
  flex-direction: column;
  transition: border-color 0.3s;
}

.dark .spine-container {
  background: radial-gradient(circle at 50% 50%, #1e293b, #0f172a);
  border-color: #334155;
  box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.5);
}

.sim-wrapper {
  position: relative;
  width: 100%;
}

canvas#simCanvas {
  width: 100%;
  aspect-ratio: 1 / 1;
  display: block;
}

.tension-panel {
  position: relative;
  width: 100%;
  background: white;
  padding: 16px;
  border-top: 1px solid #e2e8f0;
  z-index: 20;
  transition: background 0.3s, border-color 0.3s;
}

.dark .tension-panel {
  background: #1e293b;
  border-top-color: #334155;
}

.instruction-overlay {
  position: absolute;
  bottom: 10px;
  left: 0;
  right: 0;
  text-align: center;
  pointer-events: none;
  opacity: 0.8;
}

/* Desktop Overrides */
@media (min-width: 768px) {
  .spine-container {
    display: block;
    height: 550px;
  }

  .sim-wrapper {
    height: 100%;
  }

  canvas#simCanvas {
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
  }

  .tension-panel {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 220px;
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(4px);
    pointer-events: none;
    border-top: 1px solid #e2e8f0;
  }

  .dark .tension-panel {
    background: rgba(30, 41, 59, 0.95);
    border-color: #475569;
    box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.3);
  }
}

/* Przyciski pozycji - POPRAWIONY STYL */
.pose-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  border-width: 2px;
  border-color: #cbd5e1;
  background-color: white;
  color: #334155;
  font-size: 0.875rem;
  font-weight: 600;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.dark .pose-btn {
  background-color: #1e293b;
  border-color: #475569;
  color: #e2e8f0;
}

.pose-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  border-color: #94a3b8;
  background-color: #f8fafc;
}

.dark .pose-btn:hover {
  background-color: #334155;
  border-color: #64748b;
}

.symptom-card {
  transition: all 0.3s ease;
  border-left: 4px solid transparent;
}
.symptom-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
  border-left-color: #ef4444;
}

/* Language & Theme Toggle */
.nav-btn {
  cursor: pointer;
  font-weight: 700;
  padding: 6px 10px;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
}
.nav-btn:hover {
  background: #f1f5f9;
}
.dark .nav-btn:hover {
  background: #334155;
}

/* Connection Flow Styles */
.connection-step {
  position: relative;
  z-index: 1;
}
.connection-arrow {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1rem 0;
  color: #94a3b8;
}
@media (min-width: 768px) {
  .connection-arrow {
    padding: 0 1rem;
    transform: rotate(-90deg);
  }
}

::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: #f1f1f1;
}
::-webkit-scrollbar-thumb {
  background: #94a3b8;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #64748b;
}

.dark ::-webkit-scrollbar-track {
  background: #0f172a;
}
.dark ::-webkit-scrollbar-thumb {
  background: #475569;
}

/* Fade in on scroll */
/* Only hide if JS is loaded (prevents invisible content if JS fails) */
.js-loaded .fade-in-section {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
  will-change: opacity, transform;
}

.fade-in-section.is-visible {
  opacity: 1;
  transform: none;
}

/* Disable animation if user prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
  .js-loaded .fade-in-section {
    opacity: 1;
    transform: none;
    transition: none;
  }
}