/* Анимации и переходы для математического тренажёра */

/* Базовые анимации */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-5px);
  }
  20%, 40%, 60%, 80% {
    transform: translateX(5px);
  }
}

@keyframes bounce {
  0%, 20%, 53%, 80%, 100% {
    transform: translate3d(0, 0, 0);
  }
  40%, 43% {
    transform: translate3d(0, -15px, 0);
  }
  70% {
    transform: translate3d(0, -7px, 0);
  }
  90% {
    transform: translate3d(0, -2px, 0);
  }
}

@keyframes correctAnswer {
  0% {
    background-color: var(--success-green);
    transform: scale(1);
  }
  50% {
    background-color: var(--success-green);
    transform: scale(1.1);
  }
  100% {
    background-color: var(--surface);
    transform: scale(1);
  }
}

@keyframes incorrectAnswer {
  0% {
    background-color: var(--error-red);
    transform: translateX(0);
  }
  25% {
    background-color: var(--error-red);
    transform: translateX(-5px);
  }
  75% {
    background-color: var(--error-red);
    transform: translateX(5px);
  }
  100% {
    background-color: var(--surface);
    transform: translateX(0);
  }
}

@keyframes scoreIncrease {
  0% {
    transform: scale(1);
    color: var(--text-primary);
  }
  50% {
    transform: scale(1.2);
    color: var(--success-green);
  }
  100% {
    transform: scale(1);
    color: var(--text-primary);
  }
}

@keyframes floatUpFadePositive {
  0% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translateY(-50px) scale(1.2);
  }
}

@keyframes floatUpFadeNegative {
  0% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translateY(-50px) scale(1.2);
  }
}

/* Применение анимаций */
.screen.active {
  animation: fadeIn 0.3s ease-out;
}

.grade-btn {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.grade-btn:active {
  animation: pulse 0.2s ease-out;
}

.exercise-card {
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.exercise-card:active {
  animation: pulse 0.15s ease-out;
}

.math-problem {
  animation: slideUp 0.4s ease-out;
}

.answer-input.correct {
  animation: correctAnswer 0.6s ease-out;
}

.answer-input.incorrect {
  animation: incorrectAnswer 0.6s ease-out;
}

.stat-value.score-increase {
  animation: scoreIncrease 0.5s ease-out;
}

.history-item {
  animation: slideUp 0.3s ease-out;
}

.progress-fill {
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Анимации кнопок */
button {
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

button:active {
  transform: translateY(1px);
}

.primary-btn:hover {
  box-shadow: 0 4px 12px rgba(49, 162, 255, 0.3);
}

.dont-know-btn:active {
  animation: shake 0.5s ease-out;
}

/* Анимации появления элементов */
.results-summary {
  animation: slideUp 0.5s ease-out;
}

.result-item {
  animation: fadeIn 0.4s ease-out;
}

.result-item:nth-child(1) { animation-delay: 0.1s; }
.result-item:nth-child(2) { animation-delay: 0.2s; }
.result-item:nth-child(3) { animation-delay: 0.3s; }
.result-item:nth-child(4) { animation-delay: 0.4s; }

/* Анимации для мобильных устройств */
@media (max-width: 768px) {
  .grade-btn:hover {
    transform: none;
  }
  
  .grade-btn:active {
    transform: scale(0.95);
  }
  
  .exercise-card:hover {
    transform: none;
  }
  
  .exercise-card:active {
    transform: scale(0.98);
  }
}

/* Анимации загрузки */
.loading {
  position: relative;
  overflow: hidden;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    transparent
  );
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% {
    left: -100%;
  }
  100% {
    left: 100%;
  }
}

/* Анимации для специальных состояний */
.celebration {
  animation: bounce 0.8s ease-out;
}

.level-up {
  animation: pulse 1s ease-out infinite;
}

/* Плавные переходы между экранами */
.screen-transition-enter {
  opacity: 0;
  transform: translateX(100%);
}

.screen-transition-enter-active {
  opacity: 1;
  transform: translateX(0);
  transition: all 0.3s ease-out;
}

.screen-transition-exit {
  opacity: 1;
  transform: translateX(0);
}

.screen-transition-exit-active {
  opacity: 0;
  transform: translateX(-100%);
  transition: all 0.3s ease-out;
}

/* Отключение анимаций для пользователей с ограниченными возможностями */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}