/* ========================================
   青春的故事 - 动画效果
   ======================================== */

/* 页面进入动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

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

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

/* 浮动动画 */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes floatSlow {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-15px) rotate(2deg); }
}

@keyframes floatReverse {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(15px) rotate(-2deg); }
}

/* 摇曳动画 */
@keyframes sway {
  0%, 100% { transform: rotate(-3deg); }
  50% { transform: rotate(3deg); }
}

@keyframes swaySoft {
  0%, 100% { transform: rotate(-2deg); }
  50% { transform: rotate(2deg); }
}

/* 闪烁动画 */
@keyframes twinkle {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.8; }
}

/* 书写动画 */
@keyframes writing {
  from { width: 0; }
  to { width: 100%; }
}

/* 飘落动画 */
@keyframes fall {
  0% {
    transform: translateY(-10px) rotate(0deg);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotate(360deg);
    opacity: 0;
  }
}

/* 动画应用类 */
.animate-fade-in-up {
  animation: fadeInUp 0.8s ease forwards;
}

.animate-fade-in-down {
  animation: fadeInDown 0.8s ease forwards;
}

.animate-fade-in-left {
  animation: fadeInLeft 0.8s ease forwards;
}

.animate-fade-in-right {
  animation: fadeInRight 0.8s ease forwards;
}

.animate-scale-in {
  animation: scaleIn 0.6s ease forwards;
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

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

.animate-float-reverse {
  animation: floatReverse 5s ease-in-out infinite;
}

.animate-sway {
  animation: sway 3s ease-in-out infinite;
}

.animate-sway-soft {
  animation: swaySoft 4s ease-in-out infinite;
}

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

/* 延迟动画 */
.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-600 { animation-delay: 0.6s; }
.delay-700 { animation-delay: 0.7s; }
.delay-800 { animation-delay: 0.8s; }
.delay-900 { animation-delay: 0.9s; }
.delay-1000 { animation-delay: 1s; }

/* 页面过渡 */
.page-transition {
  animation: fadeInUp 0.6s ease forwards;
}

/* 装饰元素动画 */
.decoration-float {
  animation: floatSlow 6s ease-in-out infinite;
}

.decoration-sway {
  animation: swaySoft 5s ease-in-out infinite;
}

/* 便签飘落效果 */
.note-fall {
  animation: fall 10s linear forwards;
}

/* 标题渐入 */
.title-reveal {
  overflow: hidden;
}

.title-reveal span {
  display: inline-block;
  animation: fadeInUp 0.6s ease forwards;
  opacity: 0;
}

/* 首页标题特殊效果 */
.home-title {
  animation: float 3s ease-in-out infinite, fadeInDown 1s ease forwards;
}

.home-subtitle {
  animation: fadeInUp 1s ease 0.3s forwards;
  opacity: 0;
}

.home-enter {
  animation: fadeInUp 1s ease 0.6s forwards;
  opacity: 0;
}

/* 预加载隐藏 */
.preload {
  opacity: 0;
}

/* 减少动画（用户偏好） */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}