/* ============================================================================
   Kitty英语乐园 · 主题样式表
   ----------------------------------------------------------------------------
   本文件负责所有 Tailwind 覆盖不到的"手感"层：
   1) 全局字体 / 背景 / 滚动条
   2) 关键帧动画（漂浮、摇摆、弹出、掉落花瓣、星星爆裂、翻牌……）
   3) 组件类（kitty 卡片、按钮、聊天气泡、记忆翻牌、反馈弹窗）
   设计语言：樱花粉 + 奶油白 + 大圆角 + 轻柔动画
   ============================================================================ */

/* ---------- 1. 全局基础 ---------- */

:root {
  /* 品牌色变量：改这里即可全局换肤（ZyCode 迭代常用入口） */
  --k-primary:   #ff5c8a;   /* 主粉 */
  --k-primary-d: #d92d60;   /* 深粉 */
  --k-bg-1:      #fff0f5;   /* 页面渐变起点 */
  --k-bg-2:      #ffe0ec;   /* 页面渐变终点 */
  --k-ink:       #7a3b52;   /* 樱花色文字 */
}

html { -webkit-tap-highlight-color: transparent; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  background: linear-gradient(160deg, var(--k-bg-1) 0%, var(--k-bg-2) 55%, #ffd9e8 100%);
  background-attachment: fixed; /* 渐变固定，页面滚动时不闪 */
  color: #6b3a4e;
}

/* 粉色系细滚动条 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: #ffb1c9; border-radius: 8px; }
::-webkit-scrollbar-track { background: transparent; }

/* ---------- 2. 关键帧动画 ---------- */

/* 轻柔上下漂浮（主视觉Kitty、入口图标） */
@keyframes k-bob {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}
.animate-bob { animation: k-bob 3.2s ease-in-out infinite; }

/* 挥手臂（SVG 内 transform-origin 已设到肩部） */
@keyframes k-wave {
  0%, 100% { transform: rotate(8deg); }
  50%      { transform: rotate(-18deg); }
}
.kitty-arm-wave { animation: k-wave 1.6s ease-in-out infinite; transform-origin: 78% 30%; transform-box: fill-box; }

/* 尾巴/蝴蝶结小摆动 */
@keyframes k-wiggle {
  0%, 100% { transform: rotate(-6deg); }
  50%      { transform: rotate(6deg); }
}
.animate-wiggle { animation: k-wiggle 2.4s ease-in-out infinite; transform-origin: 50% 80%; }

/* 弹出登场（卡片/弹窗） */
@keyframes k-pop {
  0%   { transform: scale(0.7); opacity: 0; }
  60%  { transform: scale(1.05); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}
.animate-pop { animation: k-pop 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) both; }

/* 上滑淡入（页面切换 / 列表项） */
@keyframes k-fade-up {
  from { transform: translateY(18px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}
.animate-fade-up { animation: k-fade-up 0.5s ease both; }

/* 答错时的左右摇头 */
@keyframes k-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-9px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(4px); }
}
.animate-shake { animation: k-shake 0.5s ease; }

/* 开心跳跃（答对Kitty） */
@keyframes k-jump {
  0%, 100% { transform: translateY(0) scale(1); }
  30%      { transform: translateY(-16px) scale(1.04); }
  60%      { transform: translateY(0) scale(0.98); }
}
.animate-jump { animation: k-jump 0.7s ease-in-out infinite; }

/* 星星积分跳动 */
@keyframes k-star-pop {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.5) rotate(12deg); }
  100% { transform: scale(1); }
}
.animate-star-pop { animation: k-star-pop 0.5s ease; }

/* 说话按钮的声波扩散 */
@keyframes k-sound {
  0%   { box-shadow: 0 0 0 0 rgba(255, 92, 138, 0.45); }
  100% { box-shadow: 0 0 0 14px rgba(255, 92, 138, 0); }
}
.animate-sound { animation: k-sound 1.1s ease-out infinite; }

/* 花瓣/爱心从上往下飘落（背景装饰） */
@keyframes k-fall {
  0%   { transform: translateY(-8vh) translateX(0) rotate(0deg); opacity: 0; }
  10%  { opacity: var(--petal-opacity, 0.7); }
  100% { transform: translateY(106vh) translateX(var(--petal-sway, 40px)) rotate(340deg); opacity: 0.15; }
}

/* 答对时星星/爱心爆裂粒子 */
@keyframes k-burst {
  0%   { transform: translate(0, 0) scale(0.4); opacity: 1; }
  100% { transform: translate(var(--dx), var(--dy)) scale(1.15) rotate(200deg); opacity: 0; }
}

/* 聊天气泡登场 */
@keyframes k-bubble-in {
  0%   { transform: translateY(14px) scale(0.92); opacity: 0; }
  100% { transform: translateY(0) scale(1); opacity: 1; }
}
.animate-bubble { animation: k-bubble-in 0.35s ease both; }

/* 消消乐卡片消除时缩小消失 */
@keyframes k-vanish {
  0%   { transform: scale(1); opacity: 1; }
  55%  { transform: scale(1.18) rotate(6deg); opacity: 1; }
  100% { transform: scale(0); opacity: 0; }
}
.animate-vanish { animation: k-vanish 0.5s ease both; }

/* 进度条加载流光 */
@keyframes k-shine {
  0%   { background-position: -200px 0; }
  100% { background-position: 260px 0; }
}

/* ---------- 3. 组件类 ---------- */

/* 白色奶fufu卡片 */
.kitty-card {
  background: rgba(255, 255, 255, 0.92);
  border: 2px solid #ffd3e1;
  border-radius: 1.75rem;
  box-shadow: 0 10px 30px -8px rgba(244, 63, 117, 0.18);
  backdrop-filter: blur(6px);
}
/* 卡片悬浮手感（仅桌面端悬停生效） */
@media (hover: hover) {
  .kitty-card-hover { transition: transform .25s ease, box-shadow .25s ease; }
  .kitty-card-hover:hover { transform: translateY(-6px) rotate(-0.5deg); box-shadow: 0 22px 46px -12px rgba(244, 63, 117, 0.32); }
}

/* 粉色主按钮 */
.btn-kitty {
  background: linear-gradient(135deg, #ff8fb2 0%, #ff5c8a 60%, #f43f75 100%);
  color: #fff;
  border-radius: 9999px;
  font-weight: 700;
  box-shadow: 0 8px 22px -6px rgba(244, 63, 117, 0.55), inset 0 -3px 0 rgba(0,0,0,0.06);
  transition: transform .15s ease, filter .15s ease;
  border: 2px solid rgba(255, 255, 255, 0.55);
}
.btn-kitty:active { transform: scale(0.94); filter: brightness(1.05); }
.btn-kitty:disabled { opacity: .55; pointer-events: none; }

/* 白色描边副按钮 */
.btn-ghost {
  background: #fff;
  color: var(--k-primary-d);
  border: 2px solid #ffb9cd;
  border-radius: 9999px;
  font-weight: 700;
  transition: transform .15s ease, background .15s ease;
}
.btn-ghost:active { transform: scale(0.94); background: #fff0f5; }

/* 四选一选项按钮 */
.option-btn {
  background: #fff;
  border: 2.5px solid #ffd3e1;
  border-radius: 1.4rem;
  font-weight: 700;
  transition: transform .12s ease, border-color .15s ease, background .15s ease;
}
.option-btn:active { transform: scale(0.96); }
.option-btn.correct {
  border-color: #34c98e; background: #e8fff4; color: #0f8a5f;
  animation: k-pop .4s ease;
}
.option-btn.wrong {
  border-color: #ff6b6b; background: #fff0f0; color: #d43c3c;
  animation: k-shake .5s ease;
}

/* 顶部标题栏毛玻璃 */
.kitty-header {
  background: rgba(255, 240, 246, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid rgba(255, 178, 204, 0.6);
}

/* 聊天气泡（对话页） */
.bubble {
  position: relative;
  max-width: 82%;
  padding: 0.7rem 1rem;
  border-radius: 1.4rem;
  line-height: 1.5;
}
.bubble-left  { background: #fff; border: 2px solid #ffd3e1; border-bottom-left-radius: .5rem; }
.bubble-right { background: linear-gradient(135deg, #ffe1ec, #ffcadd); border: 2px solid #ffb3cb; border-bottom-right-radius: .5rem; }

/* 消消乐翻牌 3D 结构 */
.flip-scene { perspective: 700px; }
.flip-inner {
  position: relative; width: 100%; height: 100%;
  transform-style: preserve-3d;
  transition: transform .45s cubic-bezier(0.34, 1.3, 0.64, 1);
}
.flip-inner.is-flipped { transform: rotateY(180deg); }
.flip-face {
  position: absolute; inset: 0;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  border-radius: 1.1rem;
  display: flex; align-items: center; justify-content: center;
}
.flip-back {
  background: linear-gradient(140deg, #ff8fb2, #f43f75);
  border: 3px solid #ffd3e1;
  box-shadow: inset 0 0 0 4px rgba(255,255,255,.35);
}
.flip-front {
  transform: rotateY(180deg);
  background: #fff;
  border: 3px solid #ffc3d6;
  flex-direction: column; gap: 2px;
}
/* 卡背蝴蝶结水印 */
.flip-back .bow-watermark { opacity: .85; filter: drop-shadow(0 2px 2px rgba(143, 40, 72, .3)); }

/* 学习时间柱状图 */
.bar-chart .bar {
  background: linear-gradient(180deg, #ff9ab8, #ff5c8a);
  border-radius: 8px 8px 4px 4px;
  min-height: 4px;
  transition: height .8s cubic-bezier(0.34, 1.3, 0.64, 1);
}

/* 樱花粉标题字 */
.kitty-title {
  color: var(--k-primary-d);
  text-shadow: 0 2px 0 #fff, 0 4px 14px rgba(244, 63, 117, 0.25);
  letter-spacing: 0.04em;
}

/* 全屏遮罩弹窗（Kitty反馈 / 用户管理） */
.overlay {
  position: fixed; inset: 0; z-index: 60;
  background: rgba(160, 60, 100, 0.28);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
}

/* 花瓣粒子（背景装饰元素） */
.petal { position: fixed; top: 0; pointer-events: none; will-change: transform; z-index: 0; }

/* 爆裂粒子（答对庆祝） */
.burst-particle { position: fixed; pointer-events: none; z-index: 70; will-change: transform, opacity; }

/* 单词详情行悬停 */
.word-row { transition: background .15s ease, transform .15s ease; }
.word-row:hover { background: #fff0f5; transform: translateX(3px); }

/* 进度条轨道 */
.track { background: #ffe0eb; border-radius: 999px; overflow: hidden; }
.track .fill {
  height: 100%;
  background: linear-gradient(90deg, #ff9ab8, #ff5c8a);
  border-radius: 999px;
  transition: width .7s ease;
}

/* 无动画偏好：尊重系统设置 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

/* ---------- 11. 3D 可拖拽立绘（ui/kitty3d.js） ---------- */

/* 舞台：提供 3D 透视；触屏拖动时禁止整页滚动 */
.kt-stage {
  position: relative;
  touch-action: none;          /* pointer 拖动时禁用手势滚动 */
  -webkit-user-select: none;
  user-select: none;
  margin: 0 auto;
}

/* 柔光晕：立绘背后的粉白发光圆盘 */
.kt-halo {
  position: absolute; inset: -2%;
  pointer-events: none;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 58%,
    rgba(255, 255, 255, 0.95) 0%,
    rgba(255, 236, 244, 0.55) 42%,
    rgba(255, 214, 232, 0.0) 72%);
  z-index: 0;
}

/* 影子：脚下的椭圆阴影，拖动时被 JS 缩放/偏移 */
.kt-shadow {
  position: absolute; left: 50%; bottom: -6px;
  width: 58%; height: 26px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center,
    rgba(219, 84, 136, 0.38) 0%, rgba(219, 84, 136, 0) 68%);
  filter: blur(3px);
  pointer-events: none;
  transition: opacity .25s ease;
  z-index: 1;
}

/* 可拖拽层：弹性回位的 spring 缓动 */
.kt-drag {
  position: relative; z-index: 2;
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform 0.65s cubic-bezier(0.22, 1.61, 0.36, 1), filter 0.25s ease;
  cursor: grab;
}
.kt-drag:active, .kt-drag.kt-hold { cursor: grabbing; }
/* 拖动中：取消过渡，跟手；拖起时加一点"上浮光晕" */
.kt-drag.kt-hold { transition: none; filter: drop-shadow(0 14px 18px rgba(255, 92, 138, 0.22)); }
.kt-drag:hover { filter: drop-shadow(0 8px 12px rgba(255, 92, 138, 0.18)); }

/* 漂浮层：平时上下漂浮（拖动时被 .kt-hold 停掉，避免跟手时抖动） */
.kt-bob { animation: k-bob 3.2s ease-in-out infinite; }
.kt-hold .kt-bob { animation-play-state: paused; }

/* 立绘本体：拖起来时禁止图片原生拖拽已由 draggable=false 处理 */
.kt-cat { display: block; pointer-events: none; }

/* 提示条：首次引导文字，拖动后自动隐藏（JS 控制） */
.kt-hint {
  position: absolute; left: 50%; bottom: -30px;
  transform: translateX(-50%);
  white-space: nowrap;
  font-size: 11px; font-weight: 700;
  color: #c2698b;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(255, 158, 190, 0.55);
  padding: 4px 12px;
  border-radius: 999px;
  box-shadow: 0 4px 10px rgba(255, 92, 138, 0.12);
  transition: opacity .5s ease, transform .5s ease;
  z-index: 3;
  pointer-events: none;
}
.kt-hint.kt-hidden { opacity: 0; transform: translateX(-50%) translateY(6px); }