/* ============================================================
   CG Viewer Engine - Transitions & Animations
   ============================================================ */

/* ----- Custom Properties ----- */
:root {
  --transition-duration: 500ms;
  --transition-easing: ease;
  --choice-stagger-delay: 80ms;
}


/* ============================================================
   Keyframes
   ============================================================ */

/* Text indicator blinking */
@keyframes blink {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
}

/* Choice buttons entrance */
@keyframes fadeInUp {
  0% {
    opacity: 0;
    transform: translateY(16px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}


/* ============================================================
   Fade
   ============================================================ */
.transition-fade-in {
  animation: transitionFadeIn var(--transition-duration, 500ms) var(--transition-easing) forwards;
}

.transition-fade-out {
  animation: transitionFadeOut var(--transition-duration, 500ms) var(--transition-easing) forwards;
}

@keyframes transitionFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes transitionFadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}


/* ============================================================
   Slide Left
   ============================================================ */
.transition-slide-left-in {
  animation: transitionSlideLeftIn var(--transition-duration, 500ms) var(--transition-easing) forwards;
}

.transition-slide-left-out {
  animation: transitionSlideLeftOut var(--transition-duration, 500ms) var(--transition-easing) forwards;
}

@keyframes transitionSlideLeftIn {
  from {
    transform: translateX(100%);
  }
  to {
    transform: translateX(0);
  }
}

@keyframes transitionSlideLeftOut {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-100%);
  }
}


/* ============================================================
   Slide Right
   ============================================================ */
.transition-slide-right-in {
  animation: transitionSlideRightIn var(--transition-duration, 500ms) var(--transition-easing) forwards;
}

.transition-slide-right-out {
  animation: transitionSlideRightOut var(--transition-duration, 500ms) var(--transition-easing) forwards;
}

@keyframes transitionSlideRightIn {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(0);
  }
}

@keyframes transitionSlideRightOut {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(100%);
  }
}


/* ============================================================
   Dissolve (fade + subtle scale)
   ============================================================ */
.transition-dissolve-in {
  animation: transitionDissolveIn var(--transition-duration, 500ms) var(--transition-easing) forwards;
}

.transition-dissolve-out {
  animation: transitionDissolveOut var(--transition-duration, 500ms) var(--transition-easing) forwards;
}

@keyframes transitionDissolveIn {
  from {
    opacity: 0;
    transform: scale(1.02);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes transitionDissolveOut {
  from {
    opacity: 1;
    transform: scale(1);
  }
  to {
    opacity: 0;
    transform: scale(0.98);
  }
}


/* ============================================================
   None (immediate, no animation)
   ============================================================ */
.transition-none {
  animation: none !important;
  transition: none !important;
}


/* ============================================================
   Choice Button Entrance (staggered)
   ============================================================ */
.choice-enter {
  opacity: 0;
  animation: fadeInUp 0.3s ease forwards;
}

.choice-enter:nth-child(1) {
  animation-delay: calc(var(--choice-stagger-delay, 80ms) * 0);
}

.choice-enter:nth-child(2) {
  animation-delay: calc(var(--choice-stagger-delay, 80ms) * 1);
}

.choice-enter:nth-child(3) {
  animation-delay: calc(var(--choice-stagger-delay, 80ms) * 2);
}

.choice-enter:nth-child(4) {
  animation-delay: calc(var(--choice-stagger-delay, 80ms) * 3);
}

.choice-enter:nth-child(5) {
  animation-delay: calc(var(--choice-stagger-delay, 80ms) * 4);
}

.choice-enter:nth-child(6) {
  animation-delay: calc(var(--choice-stagger-delay, 80ms) * 5);
}

.choice-enter:nth-child(7) {
  animation-delay: calc(var(--choice-stagger-delay, 80ms) * 6);
}

.choice-enter:nth-child(8) {
  animation-delay: calc(var(--choice-stagger-delay, 80ms) * 7);
}


/* ============================================================
   Visual Effects
   ============================================================ */

/* --- Effect overlay base --- */
.effect-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 25;
  opacity: 0;
}

/* --- Shake (applied to cg-viewport) --- */
.effect-shake {
  animation: effectShake 400ms ease-out;
}

@keyframes effectShake {
  0%  { transform: translate(0, 0); }
  10% { transform: translate(-6px, -3px); }
  20% { transform: translate(5px, 4px); }
  30% { transform: translate(-4px, 2px); }
  40% { transform: translate(4px, -4px); }
  50% { transform: translate(-3px, 3px); }
  60% { transform: translate(3px, -2px); }
  70% { transform: translate(-2px, 1px); }
  80% { transform: translate(1px, -1px); }
  100% { transform: translate(0, 0); }
}

/* --- Flash (applied to effect-overlay) --- */
.effect-flash {
  animation: effectFlash 300ms ease-out forwards;
}

@keyframes effectFlash {
  0%   { opacity: 0; background: #fff; }
  15%  { opacity: 1; }
  100% { opacity: 0; }
}

/* --- Fade to black and back (applied to effect-overlay) --- */
.effect-fade-black {
  animation: effectFadeBlack 1200ms ease-in-out forwards;
}

@keyframes effectFadeBlack {
  0%   { opacity: 0; background: #000; }
  30%  { opacity: 1; }
  70%  { opacity: 1; }
  100% { opacity: 0; }
}

/* --- Slow zoom (applied to cg-viewport) --- */
.effect-zoom-slow {
  animation: effectZoomSlow 3000ms ease-in-out;
}

@keyframes effectZoomSlow {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.05); }
  100% { transform: scale(1); }
}


/* ============================================================
   Scene Title Card
   ============================================================ */
.scene-title-card {
  position: absolute;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
  opacity: 0;
  pointer-events: none;
}

.scene-title-card.active {
  animation: sceneTitleShow 2400ms ease-in-out forwards;
}

.scene-title-text {
  color: #fff;
  font-size: 1.8rem;
  font-weight: 300;
  letter-spacing: 0.3em;
  text-align: center;
  line-height: 1.6;
  padding: 0 2rem;
  opacity: 0;
  transform: translateY(8px);
}

.scene-title-card.active .scene-title-text {
  animation: sceneTitleTextReveal 2400ms ease-in-out forwards;
}

@keyframes sceneTitleShow {
  0%   { opacity: 0; }
  15%  { opacity: 1; }
  75%  { opacity: 1; }
  100% { opacity: 0; }
}

@keyframes sceneTitleTextReveal {
  0%   { opacity: 0; transform: translateY(8px); }
  20%  { opacity: 1; transform: translateY(0); }
  70%  { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(-4px); }
}