/* ============================================
   Birthday Welcome Site - Animation Keyframes
   ============================================ */

/* --- Balloons: Float upward with gentle horizontal sway --- */
@keyframes floatUp {
  0% {
    transform: translateY(110vh) translateX(0);
    opacity: 0.9;
  }
  10% {
    opacity: 1;
  }
  25% {
    transform: translateY(75vh) translateX(15px);
  }
  50% {
    transform: translateY(45vh) translateX(-10px);
  }
  75% {
    transform: translateY(15vh) translateX(12px);
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-20vh) translateX(-5px);
    opacity: 0;
  }
}

/* --- Garland: Gentle pendulum sway --- */
@keyframes gentleSway {
  0% { transform: rotate(0deg); }
  25% { transform: rotate(2deg); }
  50% { transform: rotate(0deg); }
  75% { transform: rotate(-2deg); }
  100% { transform: rotate(0deg); }
}

/* 개별 깃발 바람 흔들림 — 비대칭 움직임으로 자연스러움 */
@keyframes flagWave {
  0%   { transform: rotate(0deg); }
  20%  { transform: rotate(var(--sw, 5deg)); }
  40%  { transform: rotate(calc(var(--sw, 5deg) * -0.5)); }
  60%  { transform: rotate(calc(var(--sw, 5deg) * 0.65)); }
  80%  { transform: rotate(calc(var(--sw, 5deg) * -0.85)); }
  100% { transform: rotate(0deg); }
}

/* --- Gift box: Playful bounce --- */
@keyframes bounce {
  0% { transform: translateY(0); }
  40% { transform: translateY(-8px); }
  60% { transform: translateY(-3px); }
  100% { transform: translateY(0); }
}

/* --- Name entrance: Slide in from right --- */
@keyframes slideInRight {
  0% {
    transform: translateX(100vw);
    opacity: 0;
  }
  70% {
    transform: translateX(-10px);
    opacity: 1;
  }
  85% {
    transform: translateX(4px);
  }
  100% {
    transform: translateX(0);
    opacity: 1;
  }
}

/* --- Name exit: Slide out to left --- */
@keyframes slideOutLeft {
  0% {
    transform: translateX(0);
    opacity: 1;
  }
  100% {
    transform: translateX(-100vw);
    opacity: 0;
  }
}

/* --- Sparkles: Pop outward from edges then fade --- */
@keyframes sparklePopFade {
  0% {
    transform: translate(0, 0) scale(0);
    opacity: 0;
  }
  20% {
    transform: translate(var(--sx), var(--sy)) scale(1.2);
    opacity: 1;
  }
  60% {
    transform: translate(calc(var(--sx) * 2.2), calc(var(--sy) * 2.2)) scale(0.9);
    opacity: 0.7;
  }
  100% {
    transform: translate(calc(var(--sx) * 3), calc(var(--sy) * 3)) scale(0.3);
    opacity: 0;
  }
}

/* --- Teddy bear: Gentle wobble tilt --- */
@keyframes wobble {
  0% { transform: rotate(0deg); }
  20% { transform: rotate(5deg); }
  40% { transform: rotate(0deg); }
  60% { transform: rotate(-5deg); }
  80% { transform: rotate(0deg); }
  100% { transform: rotate(0deg); }
}

/* --- Lollipop: Slow continuous spin --- */
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* --- General floating: Smooth drifting path --- */
@keyframes drift {
  0% {
    transform: translate(0, 0);
  }
  20% {
    transform: translate(25px, -15px);
  }
  40% {
    transform: translate(-10px, -30px);
  }
  60% {
    transform: translate(15px, -10px);
  }
  80% {
    transform: translate(-20px, -25px);
  }
  100% {
    transform: translate(0, 0);
  }
}

/* --- Cake: Gentle breathing scale --- */
@keyframes breathe {
  0% { transform: scale(0.97); }
  50% { transform: scale(1.03); }
  100% { transform: scale(0.97); }
}

/* --- Party hat: Bounce synced with name appearance --- */
@keyframes hatBounce {
  0% {
    transform: translateY(0);
  }
  20% {
    transform: translateY(-6px);
  }
  40% {
    transform: translateY(0);
  }
  55% {
    transform: translateY(-3px);
  }
  70% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(0);
  }
}

/* --- Ribbon bow: Butterfly-like fluttering --- */
@keyframes butterflyFloat {
  0% {
    transform: translateX(0) rotate(0deg);
  }
  15% {
    transform: translateX(20px) rotate(5deg);
  }
  30% {
    transform: translateX(-5px) rotate(-3deg);
  }
  50% {
    transform: translateX(15px) rotate(4deg);
  }
  65% {
    transform: translateX(-15px) rotate(-5deg);
  }
  80% {
    transform: translateX(10px) rotate(3deg);
  }
  100% {
    transform: translateX(0) rotate(0deg);
  }
}

/* --- Magic wand: Curved S-path drift --- */
@keyframes curvedDrift {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  20% {
    transform: translate(30px, -20px) rotate(8deg);
  }
  40% {
    transform: translate(-15px, -45px) rotate(-5deg);
  }
  60% {
    transform: translate(25px, -25px) rotate(6deg);
  }
  80% {
    transform: translate(-20px, -40px) rotate(-8deg);
  }
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
}

/* --- Cupcake/Macaron: Diagonal bounce --- */
@keyframes diagonalBounce {
  0% {
    transform: translate(0, 0);
  }
  20% {
    transform: translate(12px, -18px);
  }
  40% {
    transform: translate(5px, -8px);
  }
  60% {
    transform: translate(-10px, -22px);
  }
  80% {
    transform: translate(-4px, -10px);
  }
  100% {
    transform: translate(0, 0);
  }
}

/* --- Name container entrance --- */
@keyframes fadeInScale {
  0% {
    transform: scale(0.6);
    opacity: 0;
  }
  60% {
    transform: scale(1.05);
    opacity: 1;
  }
  80% {
    transform: scale(0.97);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* --- Confetti: Fall from top with spin and drift --- */
@keyframes confettiFloat {
  0% {
    transform: translateY(-10vh) translateX(0) rotate(0deg);
    opacity: 1;
  }
  25% {
    transform: translateY(20vh) translateX(15px) rotate(90deg);
  }
  50% {
    transform: translateY(45vh) translateX(-10px) rotate(180deg);
  }
  75% {
    transform: translateY(70vh) translateX(12px) rotate(270deg);
  }
  100% {
    transform: translateY(110vh) translateX(-5px) rotate(360deg);
    opacity: 0;
  }
}


/* ============================================
   Utility Animation Classes
   ============================================ */

/* --- Float up (balloons) --- */
.anim-float-up {
  animation: floatUp 14s ease-in-out infinite;
  will-change: transform, opacity;
}

/* --- Gentle sway (garland) --- */
.anim-sway {
  /* 컨테이너 전체 회전 제거 — 개별 깃발이 각자 흔들림 */
  transform-origin: top center;
}

/* --- Bounce (gift box) --- */
.anim-bounce {
  animation: bounce 2s ease-in-out infinite;
  will-change: transform;
}

/* --- (sparkle particles use JS-triggered .active class instead) --- */

/* --- Wobble (teddy bear) --- */
.anim-wobble {
  animation: wobble 3s ease-in-out infinite;
  will-change: transform;
}

/* --- Spin (lollipop) --- */
.anim-spin {
  animation: spin 9s linear infinite;
  will-change: transform;
}

/* --- Drift (general floating) --- */
.anim-drift {
  animation: drift 12s ease-in-out infinite;
  will-change: transform;
}

/* --- Breathe (cake) --- */
.anim-breathe {
  animation: breathe 4s ease-in-out infinite;
  will-change: transform;
}

/* --- Hat bounce (party hat) --- */
.anim-hat-bounce {
  animation: hatBounce 1.8s ease-in-out infinite;
  will-change: transform;
}

/* --- Butterfly float (ribbon bow) --- */
.anim-butterfly-float {
  animation: butterflyFloat 6s ease-in-out infinite;
  will-change: transform;
}

/* --- Curved drift (magic wand) --- */
.anim-curved-drift {
  animation: curvedDrift 10s ease-in-out infinite;
  will-change: transform;
}

/* --- Diagonal bounce (cupcake/macaron) --- */
.anim-diagonal-bounce {
  animation: diagonalBounce 5s ease-in-out infinite;
  will-change: transform;
}

/* --- Fade in with scale (name container) --- */
.anim-fade-in-scale {
  animation: fadeInScale 0.6s ease-out forwards;
  will-change: transform, opacity;
}

/* --- Confetti float --- */
.anim-confetti {
  animation: confettiFloat 6s linear infinite;
  will-change: transform, opacity;
}

/* --- Name slide transitions --- */
.slide-in {
  animation: slideInRight 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
  will-change: transform, opacity;
}

.slide-out {
  animation: slideOutLeft 0.6s cubic-bezier(0.55, 0.085, 0.68, 0.53) forwards;
  will-change: transform, opacity;
}

/* --- Floating decoration base style --- */
.floating-decoration {
  position: fixed;
  pointer-events: none;
  z-index: 10;
  will-change: transform, opacity;
}