/**
 * 爱刷题吖 (MiniProgram Official Website)
 * 动态微交互与物理粒子动画库
 */

/* ========== 1. 小程序同款物理爱心绽放动画系统 ========== */

/* 全屏粒子挂载容器 */
#heartParticlesOverlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 99999;
  overflow: hidden;
}

/* 外层：专职负责物理位移 (X/Y 位移通过 CSS 变量动态注入) */
.heart-particle {
  position: absolute;
  pointer-events: none;
  transform: translate(-50%, -50%);
  animation-name: heartMoveAnim;
  animation-timing-function: cubic-bezier(0.25, 0.1, 0.25, 1);
  animation-fill-mode: forwards;
}

/* 单击粒子：温润舒展 0.85s (与小程序最新调校完全一致) */
.heart-particle-click {
  animation-duration: 0.85s;
}

/* 划动微轨迹粒子：轻盈轻掠 0.7s */
.heart-particle-swipe {
  animation-duration: 0.7s;
}

/* 内层：专职负责 1.18 初始微放大与平滑衰减渐隐 */
.heart-inner {
  display: block;
  width: 100%;
  height: 100%;
  animation-name: heartScaleFadeAnim;
  animation-timing-function: cubic-bezier(0.25, 0.1, 0.25, 1);
  animation-fill-mode: forwards;
  will-change: transform, opacity;
}

.heart-inner-click {
  animation-duration: 0.85s;
}

.heart-inner-swipe {
  animation-duration: 0.7s;
}

.heart-inner img,
.heart-inner svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 2px 8px rgba(244, 114, 182, 0.45));
}

/* 物理位移关键帧 */
@keyframes heartMoveAnim {
  0% {
    transform: translate(-50%, -50%) translate(0px, 0px);
  }
  100% {
    transform: translate(-50%, -50%) translate(var(--target-x), var(--target-y));
  }
}

/* 缩放衰减关键帧 (由 1.18 舒展递减至 0.2) */
@keyframes heartScaleFadeAnim {
  0% {
    transform: scale(0.4) rotate(var(--rot, 0deg));
    opacity: 0.95;
  }
  20% {
    transform: scale(1.18) rotate(var(--rot, 0deg));
    opacity: 1;
  }
  70% {
    transform: scale(0.9) rotate(var(--rot, 0deg));
    opacity: 0.8;
  }
  100% {
    transform: scale(0.2) rotate(var(--rot, 0deg));
    opacity: 0;
  }
}

/* ========== 2. 3D 浮动手机样机慢速呼吸动效 ========== */
@keyframes phoneFloat {
  0% {
    transform: translateY(0px) rotate3d(1, 1, 0, 3deg);
  }
  50% {
    transform: translateY(-14px) rotate3d(1, 1, 0, 5deg);
  }
  100% {
    transform: translateY(0px) rotate3d(1, 1, 0, 3deg);
  }
}

.floating-phone {
  animation: phoneFloat 6s ease-in-out infinite;
  perspective: 1200px;
  transform-style: preserve-3d;
}

/* ========== 3. 动态光晕与彩带流动 ========== */
@keyframes gradientFlow {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.gradient-flowing {
  background-size: 200% 200%;
  animation: gradientFlow 5s ease infinite;
}

/* 脉冲徽章微光 */
@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.4);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(37, 99, 235, 0);
  }
}

.pulse-glow {
  animation: pulseGlow 2.5s infinite cubic-bezier(0.4, 0, 0.6, 1);
}

/* ========== 4. 页面元素入场动画 ========== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* 延迟序列 */
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }