/* === ANIMATIONS ===
   모든 애니메이션과 트랜지션을 정의합니다. */

/* === 기본 애니메이션 === */
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

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

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

@keyframes slideInUp {
  from {
    transform: translateY(100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideInDown {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes bounce {
  0%, 20%, 53%, 80%, 100% {
    transform: translate3d(0,0,0);
  }
  40%, 43% {
    transform: translate3d(0, -30px, 0);
  }
  70% {
    transform: translate3d(0, -15px, 0);
  }
  90% {
    transform: translate3d(0, -4px, 0);
  }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-10px); }
  20%, 40%, 60%, 80% { transform: translateX(10px); }
}

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

/* === 콤보 팝 애니메이션 === */
@keyframes combo-pop-animation {
  0% { transform: scale(1); }
  50% { transform: scale(1.4); }
  100% { transform: scale(1); }
}

/* === 게임 시작 버튼 애니메이션 === */
@keyframes pulse-start-btn {
  0% {
    transform: scale(1);
    box-shadow: 5px 5px 0px var(--secondary);
  }
  50% {
    transform: scale(1.05);
    box-shadow: 8px 8px 15px var(--secondary);
  }
  100% {
    transform: scale(1);
    box-shadow: 5px 5px 0px var(--secondary);
  }
}

/* === 글로우 효과 === */
@keyframes glow {
  0% { box-shadow: 0 0 5px var(--accent); }
  50% { box-shadow: 0 0 20px var(--accent); }
  100% { box-shadow: 0 0 5px var(--accent); }
}

/* === 정답 펄스 효과 === */
@keyframes correct-pulse {
  0% {
    background-color: var(--correct);
    transform: scale(1);
  }
  50% {
    background-color: var(--correct);
    transform: scale(1.02);
    box-shadow: 0 0 15px var(--correct);
  }
  100% {
    background-color: var(--correct);
    transform: scale(1);
  }
}

/* === 오답 흔들기 효과 === */
@keyframes incorrect-shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
  20%, 40%, 60%, 80% { transform: translateX(5px); }
}

/* === 페이드 인/아웃 클래스 === */
.fade-in {
  animation: fadeIn 0.3s ease-in-out;
}

.fade-out {
  animation: fadeOut 0.3s ease-in-out;
}

.slide-in-up {
  animation: slideInUp 0.4s ease-out;
}

.slide-in-down {
  animation: slideInDown 0.4s ease-out;
}

.bounce {
  animation: bounce 1s ease-in-out;
}

.shake {
  animation: shake 0.5s ease-in-out;
}

.pulse {
  animation: pulse 2s infinite;
}

.glow {
  animation: glow 2s infinite;
}

.correct-pulse {
  animation: correct-pulse 0.6s ease-out;
}

.incorrect-shake {
  animation: incorrect-shake 0.5s ease-out;
}

/* === 트랜지션 클래스 === */
.transition-all {
  transition: all 0.3s ease;
}

.transition-fast {
  transition: all 0.15s ease;
}

.transition-slow {
  transition: all 0.5s ease;
}

/* === 호버 효과 === */
.hover-lift:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.hover-grow:hover {
  transform: scale(1.05);
}

.hover-shrink:hover {
  transform: scale(0.95);
}

/* === 로딩 애니메이션 === */
.loading-dots {
  display: inline-block;
}

.loading-dots:after {
  content: '';
  animation: loading-dots 1.5s infinite;
}

@keyframes loading-dots {
  0%, 20% { content: ''; }
  40% { content: '.'; }
  60% { content: '..'; }
  80%, 100% { content: '...'; }
}