/* ============================================
 * animations.css - 纯动画关键帧与工具类
 * ============================================ */

/* ---------- fadeInUp ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- fadeInDown ---------- */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- fadeInLeft ---------- */
@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ---------- fadeInRight ---------- */
@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ---------- scaleIn ---------- */
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ---------- float ---------- */
@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-15px);
  }
}

/* ---------- gradient ---------- */
@keyframes gradient {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* ---------- shimmer ---------- */
@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

/* ---------- pulse ---------- */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.7;
    transform: scale(1.05);
  }
}

/* ---------- slideIn ---------- */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ============================================
 * 动画工具类
 * ============================================ */

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

.animate-fade-in-down {
  animation: fadeInDown 0.6s ease-out forwards;
}

.animate-fade-in-left {
  animation: fadeInLeft 0.6s ease-out forwards;
}

.animate-fade-in-right {
  animation: fadeInRight 0.6s ease-out forwards;
}

.animate-scale-in {
  animation: scaleIn 0.5s ease-out forwards;
}

.animate-float {
  animation: float 4s ease-in-out infinite;
}

.animate-gradient {
  background-size: 200% 200%;
  animation: gradient 6s ease infinite;
}

.animate-shimmer {
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.4) 50%,
    transparent 100%
  );
  background-size: 200% 100%;
  animation: shimmer 2s infinite;
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

.animate-slide-in {
  animation: slideIn 0.5s ease-out forwards;
}

/* 延迟工具类 */
.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }
.delay-500 { animation-delay: 0.5s; }
.delay-700 { animation-delay: 0.7s; }
.delay-1000 { animation-delay: 1s; }

/* 初始隐藏（用于触发式动画） */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-up, .fade-in-down, .fade-in-left, .fade-in-right,
.slide-up, .slide-down, .slide-left, .slide-right,
.scale-in, .scale-up {
  opacity: 0;
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in-up { transform: translateY(24px); }
.fade-in-down { transform: translateY(-24px); }
.fade-in-left { transform: translateX(-24px); }
.fade-in-right { transform: translateX(24px); }
.slide-up { transform: translateY(40px); }
.slide-down { transform: translateY(-40px); }
.slide-left { transform: translateX(-40px); }
.slide-right { transform: translateX(40px); }
.scale-in { transform: scale(0.92); }
.scale-up { transform: scale(0.88); }

.fade-in-up.visible, .fade-in-down.visible, .fade-in-left.visible, .fade-in-right.visible,
.slide-up.visible, .slide-down.visible, .slide-left.visible, .slide-right.visible,
.scale-in.visible, .scale-up.visible {
  opacity: 1;
  transform: none;
}