/* 基本動畫效果 */
.animate-fade-in {
  animation: fadeIn 1s ease-out forwards;
}

.animate-slide-up {
  animation: slideUp 0.8s ease-out forwards;
}

.animate-slide-in {
  animation: slideIn 0.8s ease-out forwards;
}

/* 淡入動畫 */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* 上滑動畫 */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 左滑入動畫 */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* 按鈕載入動畫 */
.button-loader {
  display: none;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #fff;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

button.loading span {
  visibility: hidden;
}

button.loading .button-loader {
  display: block;
}

/* 訊息顯示動畫 */
.success-message, .error-message {
  animation: slideDown 0.3s ease-out forwards;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 卡片漸進顯示 */
[data-aos="fade-up"] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

[data-aos="fade-up"].aos-animate {
  opacity: 1;
  transform: translateY(0);
}

/* 註解掉立刻觸發所有 AOS 動畫，以防背景卡片閃爍 */
/*body.loaded [data-aos] {
  opacity: 1;
  transform: translateY(0);
}*/

/* 自動觸發 AOS 動畫，無需額外套件 */
@media (prefers-reduced-motion: no-preference) {
  [data-aos] {
    transition-delay: calc(var(--data-aos-delay, 0) * 1ms);
  }
  
  /* 初始載入時的動畫 */
  .card[data-aos] {
    animation: cardFadeIn 0.6s forwards;
    animation-delay: calc(var(--data-aos-delay, 0) * 1ms);
  }
  
  @keyframes cardFadeIn {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

/* 卡片懸停效果增強 */
.card:after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  height: 4px;
  width: 100%;
  background: var(--main-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.card:hover:after {
  transform: scaleX(1);
}

/* 表單提交按鈕點擊效果 */
button[type="submit"]:after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 5px;
  height: 5px;
  background: rgba(255, 255, 255, 0.5);
  opacity: 0;
  border-radius: 100%;
  transform: scale(1, 1) translate(-50%);
  transform-origin: 50% 50%;
}

button[type="submit"]:focus:not(:active)::after {
  animation: ripple 1s ease-out;
}

@keyframes ripple {
  0% {
    transform: scale(0, 0);
    opacity: 1;
  }
  20% {
    transform: scale(25, 25);
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: scale(40, 40);
  }
}

/* 禁用卡片初始和重複動畫，避免背景卡片在頁面載入或打開模態時閃爍 */
.card[data-aos] {
  animation: none !important;
  transition: none !important;
  opacity: 1 !important;
  transform: none !important;
}