/**
 * 交互动画系统
 * 借鉴Linear + Aesop的设计理念
 * 克制的动效，每一个动画都有意义
 */

/* ==================== 动画基础变量 ==================== */
:root {
  --anim-duration-xs: 150ms;
  --anim-duration-sm: 200ms;
  --anim-duration-md: 300ms;
  --anim-duration-lg: 500ms;
  --anim-duration-xl: 700ms;
  
  --anim-ease-out: cubic-bezier(0, 0, 0.2, 1);
  --anim-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --anim-ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --anim-ease-elastic: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ==================== 入场动画 ==================== */

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

.animate-fade-in {
  animation: fadeIn var(--anim-duration-md) var(--anim-ease-out) forwards;
}

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

.animate-slide-up {
  animation: slideUp var(--anim-duration-md) var(--anim-ease-out) forwards;
}

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

.animate-slide-down {
  animation: slideDown var(--anim-duration-md) var(--anim-ease-out) forwards;
}

/* 向左滑入 */
@keyframes slideLeft {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.animate-slide-left {
  animation: slideLeft var(--anim-duration-md) var(--anim-ease-out) forwards;
}

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

.animate-slide-right {
  animation: slideRight var(--anim-duration-md) var(--anim-ease-out) forwards;
}

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

.animate-scale-in {
  animation: scaleIn var(--anim-duration-md) var(--anim-ease-out) forwards;
}

/* 旋转进入 */
@keyframes rotateIn {
  from {
    opacity: 0;
    transform: rotate(-5deg) scale(0.95);
  }
  to {
    opacity: 1;
    transform: rotate(0deg) scale(1);
  }
}

.animate-rotate-in {
  animation: rotateIn var(--anim-duration-lg) var(--anim-ease-out) forwards;
}

/* ==================== 交错入场（用于列表） ==================== */
.animate-stagger > * {
  opacity: 0;
}

.animate-stagger.animated > *:nth-child(1) { animation: slideUp var(--anim-duration-md) var(--anim-ease-out) 0ms forwards; }
.animate-stagger.animated > *:nth-child(2) { animation: slideUp var(--anim-duration-md) var(--anim-ease-out) 50ms forwards; }
.animate-stagger.animated > *:nth-child(3) { animation: slideUp var(--anim-duration-md) var(--anim-ease-out) 100ms forwards; }
.animate-stagger.animated > *:nth-child(4) { animation: slideUp var(--anim-duration-md) var(--anim-ease-out) 150ms forwards; }
.animate-stagger.animated > *:nth-child(5) { animation: slideUp var(--anim-duration-md) var(--anim-ease-out) 200ms forwards; }
.animate-stagger.animated > *:nth-child(6) { animation: slideUp var(--anim-duration-md) var(--anim-ease-out) 250ms forwards; }
.animate-stagger.animated > *:nth-child(7) { animation: slideUp var(--anim-duration-md) var(--anim-ease-out) 300ms forwards; }
.animate-stagger.animated > *:nth-child(8) { animation: slideUp var(--anim-duration-md) var(--anim-ease-out) 350ms forwards; }

/* ==================== 微交互动画 ==================== */

/* 按钮悬停 */
.btn-animate-hover {
  transition: transform var(--anim-duration-sm) var(--anim-ease-out),
              box-shadow var(--anim-duration-sm) var(--anim-ease-out),
              background-color var(--anim-duration-sm) var(--anim-ease-out);
}

.btn-animate-hover:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* 按钮点击 */
.btn-animate-click {
  transition: transform var(--anim-duration-xs) var(--anim-ease-out);
}

.btn-animate-click:active {
  transform: scale(0.95);
}

/* 卡片悬停 */
.card-animate-hover {
  transition: transform var(--anim-duration-md) var(--anim-ease-out),
              box-shadow var(--anim-duration-md) var(--anim-ease-out),
              border-color var(--anim-duration-md) var(--anim-ease-out);
}

.card-animate-hover:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

/* 输入框焦点 */
.input-animate-focus {
  transition: border-color var(--anim-duration-sm) var(--anim-ease-out),
              box-shadow var(--anim-duration-sm) var(--anim-ease-out),
              transform var(--anim-duration-sm) var(--anim-ease-out);
}

.input-animate-focus:focus {
  border-color: var(--primary-400);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
  transform: scale(1.02);
}

/* 链接悬停 */
.link-animate-hover {
  position: relative;
  transition: color var(--anim-duration-sm) var(--anim-ease-out);
}

.link-animate-hover::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-400);
  transition: width var(--anim-duration-md) var(--anim-ease-out);
}

.link-animate-hover:hover::after {
  width: 100%;
}

/* ==================== 页面过渡动画 ==================== */

/* 页面进入 */
@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-animate-enter {
  animation: pageEnter var(--anim-duration-lg) var(--anim-ease-out) forwards;
}

/* 页面离开 */
@keyframes pageLeave {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-20px);
  }
}

.page-animate-leave {
  animation: pageLeave var(--anim-duration-md) var(--anim-ease-out) forwards;
}

/* 路由切换 */
.route-animate-transition {
  animation: pageEnter var(--anim-duration-lg) var(--anim-ease-out) forwards;
}

/* ==================== 滚动触发动画类 ==================== */

/* 初始状态 - 隐藏 */
.scroll-animate {
  opacity: 0;
  transition: opacity var(--anim-duration-lg) var(--anim-ease-out),
              transform var(--anim-duration-lg) var(--anim-ease-out);
}

/* 向上滑入 */
.scroll-animate-up {
  transform: translateY(40px);
}

/* 向左滑入 */
.scroll-animate-left {
  transform: translateX(40px);
}

/* 向右滑入 */
.scroll-animate-right {
  transform: translateX(-40px);
}

/* 缩放进入 */
.scroll-animate-scale {
  transform: scale(0.9);
}

/* 激活状态 - 显示 */
.scroll-animate.animated {
  opacity: 1;
  transform: translateY(0) translateX(0) scale(1);
}

/* 延迟类 */
.scroll-delay-1 { transition-delay: 100ms; }
.scroll-delay-2 { transition-delay: 200ms; }
.scroll-delay-3 { transition-delay: 300ms; }
.scroll-delay-4 { transition-delay: 400ms; }
.scroll-delay-5 { transition-delay: 500ms; }

/* ==================== 持续动画 ==================== */

/* 脉冲动画 */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.animate-pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* 弹跳动画 */
@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.animate-bounce {
  animation: bounce 2s var(--anim-ease-in-out) infinite;
}

/* 摇摆动画 */
@keyframes wiggle {
  0%, 100% {
    transform: rotate(-3deg);
  }
  50% {
    transform: rotate(3deg);
  }
}

.animate-wiggle {
  animation: wiggle 0.5s var(--anim-ease-in-out) infinite;
}

/* 呼吸动画 */
@keyframes breathe {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.animate-breathe {
  animation: breathe 3s var(--anim-ease-in-out) infinite;
}

/* ==================== 加载动画 ==================== */

/* 旋转加载 */
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.animate-spin {
  animation: spin 1s linear infinite;
}

/* 点跳动加载 */
@keyframes bounceDot {
  0%, 80%, 100% {
    transform: scale(0);
  }
  40% {
    transform: scale(1);
  }
}

.animate-dots {
  display: flex;
  gap: 4px;
}

.animate-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary-400);
  animation: bounceDot 1.4s var(--anim-ease-in-out) infinite both;
}

.animate-dots span:nth-child(1) { animation-delay: -0.32s; }
.animate-dots span:nth-child(2) { animation-delay: -0.16s; }
.animate-dots span:nth-child(3) { animation-delay: 0s; }

/* ==================== 特殊效果 ==================== */

/* 光晕效果 */
@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 20px rgba(14, 165, 233, 0.4);
  }
  50% {
    box-shadow: 0 0 40px rgba(14, 165, 233, 0.8);
  }
}

.animate-glow {
  animation: glow 2s var(--anim-ease-in-out) infinite;
}

/* 渐变背景动画 */
@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.animate-gradient {
  background-size: 200% 200%;
  animation: gradientShift 3s var(--anim-ease-in-out) infinite;
}

/* ==================== 工具类 ==================== */

/* 禁用动画 */
.animate-none {
  animation: none !important;
  transition: none !important;
}

/* 暂停动画 */
.animate-paused {
  animation-play-state: paused;
}

/* 动画速度 */
.animate-fast {
  --anim-duration-xs: 75ms;
  --anim-duration-sm: 100ms;
  --anim-duration-md: 150ms;
  --anim-duration-lg: 250ms;
  --anim-duration-xl: 350ms;
}

.animate-slow {
  --anim-duration-xs: 300ms;
  --anim-duration-sm: 400ms;
  --anim-duration-md: 600ms;
  --anim-duration-lg: 1000ms;
  --anim-duration-xl: 1400ms;
}