/* ========================================
   单词小锤手 Word Whack — v2 设计系统
   风格：卡通圆润 · 紧凑 · 暖色系
   完全重写于 2026-06-19
   原则：HTML/JS 一行不动，所有 class 保留
   ======================================== */

/* ========== 设计 Token ========== */
:root {
  /* 色板 */
  --bg: #FFF8E7;
  --card: #FFFFFF;
  --primary: #FFD93D;
  --primary-deep: #F4B400;
  --accent: #FF6B6B;
  --success: #4ECDC4;
  --success-deep: #3DB8B0;
  --text: #2D3142;
  --text-soft: #6B7280;
  --text-mute: #9CA3AF;
  --border: #F3E8C2;
  --border-soft: #EAEAEA;
  --warn: #FB923C;
  --wrong: #EF4444;
  --eye-care-bg: #2A2A3E;
  --eye-care-card: #3A3A52;
  --eye-care-text: #E5E5F0;

  /* 圆角 */
  --r-sm: 12px;
  --r-md: 16px;
  --r-lg: 20px;
  --r-xl: 24px;
  --r-pill: 999px;

  /* 阴影（卡通硬阴影） */
  --shadow-sm: 0 2px 0 rgba(45,49,66,.10);
  --shadow-md: 0 4px 0 rgba(45,49,66,.12);
  --shadow-lg: 0 6px 0 rgba(45,49,66,.14);
  --shadow-card: 0 2px 8px rgba(45,49,66,.08);

  /* 间距（4px 网格） */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-7: 32px;
  --sp-8: 40px;

  /* 字号 */
  --fs-xs: 11px;
  --fs-sm: 13px;
  --fs-base: 15px;
  --fs-md: 16px;
  --fs-lg: 18px;
  --fs-xl: 22px;
  --fs-2xl: 28px;
  --fs-3xl: 36px;

  /* 安全区 */
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

/* ========== 全局重置 ========== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}
html, body {
  width: 100%;
  height: 100%;
  height: 100dvh;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: var(--fs-base);
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  touch-action: manipulation;
  overscroll-behavior: none;
}
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  font-size: inherit;
}
img { max-width: 100%; display: block; }

/* ========== Screen 切换 ========== */
#game-container {
  width: 100%;
  height: 100vh;
  height: 100dvh;
  position: relative;
  overflow: hidden;
}
.screen {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  background: var(--bg);
  overflow: hidden;
  z-index: 1;
}
.screen.active { display: flex; z-index: 10; }
.screen.overlay {
  background: rgba(45,49,66,.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  align-items: center;
  justify-content: center;
  z-index: 100;
}

/* ========== 通用按钮 ========== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 14px var(--sp-6);
  background: var(--primary);
  color: var(--text);
  font-size: var(--fs-md);
  font-weight: 700;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-md);
  transition: transform .12s ease, box-shadow .12s ease;
  white-space: nowrap;
}
.btn-primary:active {
  transform: translateY(3px);
  box-shadow: 0 1px 0 rgba(45,49,66,.10);
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 12px var(--sp-5);
  background: var(--card);
  color: var(--text);
  font-size: var(--fs-sm);
  font-weight: 600;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-sm);
  transition: transform .12s ease, box-shadow .12s ease;
  white-space: nowrap;
}
.btn-secondary:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 rgba(45,49,66,.08);
}
.btn-icon {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--card);
  color: var(--text);
  font-size: var(--fs-lg);
  border-radius: var(--r-sm);
  box-shadow: var(--shadow-sm);
  transition: transform .12s ease, box-shadow .12s ease;
  flex-shrink: 0;
}
.btn-icon:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 rgba(45,49,66,.08);
}
.btn-skip {
  padding: 6px var(--sp-3);
  background: transparent;
  color: var(--text-soft);
  font-size: var(--fs-sm);
  font-weight: 600;
  border-radius: var(--r-sm);
  transition: background .12s;
}
.btn-skip:active { background: rgba(45,49,66,.06); }
.btn-danger {
  width: 100%;
  padding: 12px var(--sp-5);
  background: var(--wrong);
  color: #FFF;
  font-size: var(--fs-sm);
  font-weight: 600;
  border-radius: var(--r-md);
  box-shadow: 0 3px 0 rgba(239,68,68,.35);
  transition: transform .12s, box-shadow .12s;
}
.btn-danger:active { transform: translateY(2px); box-shadow: 0 1px 0 rgba(239,68,68,.35); }
.btn-speak {
  width: 36px; height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--card);
  color: var(--text);
  font-size: var(--fs-md);
  border-radius: var(--r-pill);
  box-shadow: var(--shadow-sm);
}

/* ========== 顶部导航栏 ========== */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
  padding: 0 var(--sp-4);
  padding-top: var(--safe-top);
  flex-shrink: 0;
  background: var(--card);
  border-bottom: 1px solid var(--border-soft);
  position: relative;
  z-index: 5;
}
.top-title {
  font-size: var(--fs-md);
  font-weight: 700;
  color: var(--text);
  flex: 1;
  text-align: center;
  margin: 0 var(--sp-2);
}
.top-stars {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: var(--bg);
  color: var(--text);
  font-size: var(--fs-xs);
  font-weight: 600;
  border-radius: var(--r-pill);
}

/* ========== Screen 1：启动页 ========== */
#screen-splash {
  background: linear-gradient(180deg, #FFD93D 0%, #FFE873 35%, #FFF8E7 70%, #B3E5FC 100%);
  position: relative;
  overflow: hidden;
}
#screen-splash .bg-sky { display: none; }  /* 用渐变替代 */
#screen-splash .bg-ground {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 56px;
  background: linear-gradient(180deg, transparent 0%, var(--success) 40%, var(--success-deep) 100%);
  border-top-left-radius: 50% 80%;
  border-top-right-radius: 50% 80%;
  pointer-events: none;
  z-index: 1;
}
#screen-splash .grass-hill { display: none; }
#screen-splash .flowers {
  position: absolute;
  bottom: 6px; left: 0; right: 0;
  display: flex;
  justify-content: space-around;
  font-size: 16px;
  pointer-events: none;
  z-index: 2;
  padding: 0 var(--sp-7);
}
#screen-splash .splash-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--sp-7) var(--sp-5) var(--sp-7);
  position: relative;
  z-index: 3;
  gap: var(--sp-4);
}
.mole-logo {
  width: 100px; height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: var(--sp-5);
}
.mole-body {
  width: 100px; height: 100px;
  background: linear-gradient(180deg, #C99B6E 0%, #8B5E3C 100%);
  border-radius: 50% 50% 45% 45%;
  position: relative;
  box-shadow: var(--shadow-lg), inset 0 -8px 0 rgba(0,0,0,.08);
  animation: bob 2.5s ease-in-out infinite;
}
@keyframes bob {
  0%,100% { transform: translateY(0); }
  50%     { transform: translateY(-4px); }
}
.mole-eyes {
  position: absolute;
  top: 35%; left: 0; right: 0;
  display: flex;
  justify-content: space-around;
  padding: 0 18%;
}
.eye {
  width: 14px; height: 14px;
  background: var(--text);
  border-radius: 50%;
  position: relative;
}
.pupil {
  position: absolute;
  width: 5px; height: 5px;
  background: #FFF;
  border-radius: 50%;
  top: 3px; left: 3px;
}
.mole-cheeks {
  position: absolute;
  top: 55%; left: 0; right: 0;
  display: flex;
  justify-content: space-between;
  padding: 0 8%;
}
.cheek {
  width: 18px; height: 9px;
  background: var(--accent);
  opacity: .55;
  border-radius: 50%;
}
.mole-mouth {
  position: absolute;
  bottom: 20%; left: 50%;
  transform: translateX(-50%);
  font-size: 18px;
  color: var(--text);
}
.game-title {
  font-size: var(--fs-2xl);
  font-weight: 800;
  letter-spacing: 1px;
  text-align: center;
  text-shadow: 0 2px 0 rgba(255,217,61,.4);
}
.game-subtitle {
  font-size: var(--fs-xs);
  color: var(--text-soft);
  letter-spacing: 4px;
  text-transform: uppercase;
  text-align: center;
}
.splash-buttons {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}
.splash-buttons .btn-primary {
  width: 220px;
  font-size: var(--fs-md);
}
.splash-nav {
  display: flex;
  gap: var(--sp-3);
  justify-content: center;
}
.splash-nav .btn-icon {
  width: 44px; height: 44px;
  font-size: var(--fs-md);
}

/* ========== Screen 2：章节地图 ========== */
#screen-map {
  display: none;
  flex-direction: column;
  background: linear-gradient(180deg, #FFF8E7 0%, #E0F7F1 100%);
}
#screen-map.active { display: flex; }
.map-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--sp-4) var(--sp-4) 0;
  -webkit-overflow-scrolling: touch;
}
.path-way {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-3);
  padding: var(--sp-3) 0;
}
.chapter-card {
  position: relative;
  background: var(--card);
  border-radius: var(--r-lg);
  padding: var(--sp-4);
  box-shadow: var(--shadow-card);
  border: 2px solid transparent;
  transition: transform .15s, box-shadow .15s, border-color .15s;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 110px;
}
.chapter-card:active { transform: translateY(2px); box-shadow: 0 1px 4px rgba(45,49,66,.06); }
.chapter-card.current {
  border-color: var(--primary);
  box-shadow: var(--shadow-card), 0 0 0 3px rgba(255,217,61,.25);
}
.chapter-card.locked {
  opacity: .5;
  background: var(--bg);
}
.chapter-card .ch-num {
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--text-mute);
  letter-spacing: 1px;
}
.chapter-card .ch-icon {
  font-size: 32px;
  line-height: 1;
  margin: 4px 0;
}
.chapter-card .ch-name {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--text);
}
.chapter-card .ch-meta {
  font-size: var(--fs-xs);
  color: var(--text-soft);
}
.chapter-card .ch-stars {
  display: flex;
  gap: 2px;
  margin-top: 4px;
  font-size: 12px;
}
.map-footer {
  display: flex;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-4) calc(var(--sp-3) + var(--safe-bottom));
  background: var(--card);
  border-top: 1px solid var(--border-soft);
  flex-shrink: 0;
}
.map-footer .btn-secondary { flex: 1; padding: 12px 8px; font-size: var(--fs-xs); }

/* ========== Screen：分类大乱斗选择 ========== */
#screen-category {
  display: none;
  flex-direction: column;
}
#screen-category.active { display: flex; }
.category-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-4);
  -webkit-overflow-scrolling: touch;
}
.category-hint {
  text-align: center;
  font-size: var(--fs-sm);
  color: var(--text-soft);
  margin-bottom: var(--sp-4);
}
.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-3);
}
.category-card {
  background: var(--card);
  border-radius: var(--r-lg);
  padding: var(--sp-4);
  text-align: center;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  transition: transform .15s;
}
.category-card:active { transform: translateY(2px); }
.category-card .cat-icon { font-size: 36px; }
.category-card .cat-name { font-size: var(--fs-sm); font-weight: 700; }
.category-card .cat-count { font-size: var(--fs-xs); color: var(--text-soft); }

/* ========== Screen 3：选关 ========== */
#screen-level {
  display: none;
  flex-direction: column;
}
#screen-level.active { display: flex; }
.level-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-4);
  -webkit-overflow-scrolling: touch;
}
.level-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-3);
  padding: var(--sp-2);
}
.level-item {
  aspect-ratio: 1;
  background: linear-gradient(160deg, var(--card) 0%, #FFF4D6 100%);
  border-radius: var(--r-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--text);
  box-shadow: 0 4px 0 rgba(45,49,66,.12), 0 2px 4px rgba(45,49,66,.06);
  border: 3px solid var(--card);
  transition: transform .15s cubic-bezier(.34,1.56,.64,1), border-color .15s;
  position: relative;
  cursor: pointer;
  overflow: hidden;
}
.level-item::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -30%;
  width: 60%;
  height: 60%;
  background: var(--primary);
  opacity: .15;
  border-radius: 50%;
  pointer-events: none;
}
.level-item .level-num {
  font-size: 36px;
  font-weight: 900;
  color: var(--text);
  line-height: 1;
  z-index: 1;
  text-shadow: 0 2px 0 rgba(0,0,0,.05);
}
.level-item .level-stars {
  font-size: 11px;
  letter-spacing: 1px;
  z-index: 1;
  min-height: 14px;
  color: var(--primary);
  font-weight: 800;
}
.level-item:active { transform: translateY(3px); box-shadow: 0 1px 0 rgba(45,49,66,.12); }
.level-item.selected {
  border-color: var(--accent);
  background: linear-gradient(160deg, #FFF9E0 0%, var(--primary) 100%);
  transform: scale(1.04);
}
.level-item.locked {
  opacity: .5;
  background: var(--bg);
  cursor: not-allowed;
}
.level-item.locked .level-num { color: var(--text-muted); }
.level-item.locked::before { opacity: 0; }
.level-footer {
  display: flex;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4) calc(var(--sp-3) + var(--safe-bottom));
  background: var(--card);
  border-top: 1px solid var(--border-soft);
  flex-shrink: 0;
}
.level-footer .btn-secondary { flex: 1; }
.level-footer .btn-primary { flex: 2; }

/* ========== Screen 4：战前预习 ========== */
#screen-preview {
  display: none;
  flex-direction: column;
}
#screen-preview.active { display: flex; }
.preview-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-4);
  -webkit-overflow-scrolling: touch;
}
.word-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-3);
}
.word-card {
  background: var(--card);
  border-radius: var(--r-md);
  padding: var(--sp-3);
  text-align: center;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-height: 88px;
  justify-content: center;
}
.word-card .wc-emoji { font-size: 28px; }
.word-card .wc-en { font-size: var(--fs-md); font-weight: 700; color: var(--text); }
.word-card .wc-zh { font-size: var(--fs-xs); color: var(--text-soft); }
.preview-hint {
  text-align: center;
  font-size: var(--fs-xs);
  color: var(--text-mute);
  margin-top: var(--sp-4);
}

/* ========== Screen 5：游戏主界面 ========== */
#screen-game {
  display: none;
  flex-direction: column;
  background: linear-gradient(180deg, #B3E5FC 0%, #E0F7F1 100%);
}
#screen-game.active { display: flex; }
.game-top-bar {
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.game-info {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.game-info > span {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  background: var(--card);
  color: var(--text);
  font-size: var(--fs-xs);
  font-weight: 600;
  border-radius: var(--r-pill);
  box-shadow: var(--shadow-sm);
}
.target-area {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-4) var(--sp-4) var(--sp-3);
  flex-shrink: 0;
}
.target-label {
  font-size: var(--fs-sm);
  color: var(--text);
  font-weight: 600;
}
.target-word {
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--text);
  background: var(--card);
  padding: 6px 16px;
  border-radius: var(--r-pill);
  box-shadow: var(--shadow-sm);
}
.game-board {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--sp-3) var(--sp-3);
  position: relative;
  overflow: hidden;
}
.holes-grid {
  display: grid;
  gap: var(--sp-2);
  width: 100%;
  max-width: 480px;
}
.holes-grid.mobile { grid-template-columns: repeat(3, 1fr); }
.holes-grid.desktop { grid-template-columns: repeat(4, 1fr); }
.hole-wrapper {
  aspect-ratio: 1;
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  overflow: hidden;
}

/* ---- 地鼠洞（棕色土堆）---- */
.hole {
  position: absolute;
  left: 10%;
  right: 10%;
  bottom: 4%;
  height: 26%;
  background: radial-gradient(ellipse at center top, #8B5A2B 0%, #5D3A1A 100%);
  border-radius: 50%;
  box-shadow: inset 0 4px 0 rgba(0,0,0,.25), 0 2px 0 var(--text);
  z-index: 1;
}

/* ---- 地鼠整体（从洞里冒出）---- */
.mole-entity {
  position: absolute;
  bottom: -100%;
  left: 50%;
  transform: translateX(-50%);
  width: 72%;
  height: 78%;
  z-index: 2;
  cursor: pointer;
  transition: bottom .35s cubic-bezier(.34, 1.56, .64, 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 22%;
  user-select: none;
}
.mole-entity.up { bottom: 12%; }
.mole-entity.hit {
  animation: mole-hit .4s ease-out forwards;
}
.mole-entity.miss {
  animation: mole-miss .25s ease-out;
}
@keyframes mole-hit {
  0%   { bottom: 12%; transform: translateX(-50%) scale(1); }
  40%  { bottom: 12%; transform: translateX(-50%) scale(.85); }
  100% { bottom: -100%; transform: translateX(-50%) scale(.7); }
}
@keyframes mole-miss {
  0%, 100% { transform: translateX(-50%); }
  50%      { transform: translateX(-50%) translateY(-6px) rotate(-3deg); }
}

/* ---- 地鼠头（米色圆头）---- */
.mole-head {
  width: 78%;
  aspect-ratio: 1;
  background: linear-gradient(180deg, #FFE0B2 0%, #FFCC80 100%);
  border-radius: 50% 50% 45% 45%;
  position: relative;
  box-shadow:
    inset 0 -6px 0 rgba(0,0,0,.08),
    0 4px 0 rgba(0,0,0,.15);
  border: 2.5px solid var(--text);
}

/* ---- 眼睛 ---- */
.mole-eyes-small {
  position: absolute;
  top: 32%;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-around;
  padding: 0 18%;
}
.mole-eyes-small .eye {
  width: 22%;
  aspect-ratio: 1;
  background: #FFFFFF;
  border: 2px solid var(--text);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 0 rgba(0,0,0,.12);
  position: relative;
}
.mole-eyes-small .pupil {
  width: 55%;
  aspect-ratio: 1;
  background: var(--text);
  border-radius: 50%;
}
.mole-eyes-small .eye.dizzy .pupil {
  background: transparent;
  border: 2px solid var(--text);
  border-radius: 0;
  transform: rotate(45deg);
  width: 60%;
  height: 2px;
}

/* ---- 腮红 ---- */
.mole-cheeks-small {
  position: absolute;
  top: 58%;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  padding: 0 8%;
  pointer-events: none;
}
.mole-cheeks-small .cheek {
  width: 18%;
  aspect-ratio: 1;
  background: var(--accent);
  opacity: .55;
  border-radius: 50%;
  filter: blur(2px);
}

/* ---- 单词牌（挂在头下面）---- */
.mole-word-sign {
  margin-top: 4px;
  padding: 5px 10px;
  background: var(--card);
  border: 2px solid var(--accent);
  border-radius: var(--r-md);
  font-size: var(--fs-xs);
  font-weight: 800;
  color: var(--text);
  white-space: nowrap;
  box-shadow: var(--shadow-card);
  max-width: 140%;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: center;
  line-height: 1.1;
}
.mole-word-sign.bomb-sign {
  background: var(--accent);
  color: #FFFFFF;
  border-color: var(--accent);
}
.mole-word-sign.gold-sign {
  background: var(--primary);
  color: var(--text);
  border-color: var(--primary);
}

/* ---- 选中/正确/错误高亮 ---- */
.mole-entity.correct-flash .mole-head {
  background: linear-gradient(180deg, var(--success) 0%, #3DB5AD 100%);
}
.mole-entity.wrong-flash .mole-head {
  background: linear-gradient(180deg, var(--accent) 0%, #E55353 100%);
}

/* ---- 冻结效果 ---- */
.hole-wrapper.frozen .hole { opacity: 0.5; filter: grayscale(0.6); }
.hole-wrapper.frozen .mole-entity { pointer-events: none; }

/* ---- 旧类兼容（splash/result 用）---- */
.mole-logo, .mole-result {
  width: 120px;
  height: 120px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}
.mole-logo .mole-body, .mole-result .mole-body {
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, #FFE0B2 0%, #FFCC80 100%);
  border-radius: 50% 50% 45% 45%;
  position: relative;
  border: 2.5px solid var(--text);
  box-shadow: inset 0 -8px 0 rgba(0,0,0,.08), 0 6px 0 rgba(0,0,0,.15);
  animation: mole-bob 2.4s ease-in-out infinite;
}
.mole-eyes {
  position: absolute;
  top: 30%;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-around;
  padding: 0 18%;
}
.mole-eyes .eye {
  width: 22%;
  aspect-ratio: 1;
  background: #FFFFFF;
  border: 2px solid var(--text);
  border-radius: 50%;
  box-shadow: 0 2px 0 rgba(0,0,0,.12);
}
.mole-eyes .pupil {
  width: 50%;
  aspect-ratio: 1;
  background: var(--text);
  border-radius: 50%;
  margin: 25% auto 0;
}
.mole-cheeks {
  position: absolute;
  top: 55%;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  padding: 0 10%;
  pointer-events: none;
}
.mole-cheeks .cheek {
  width: 18%;
  aspect-ratio: 1;
  background: var(--accent);
  opacity: .55;
  border-radius: 50%;
  filter: blur(2px);
}
.mole-mouth {
  position: absolute;
  top: 68%;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 22px;
  color: var(--text);
}

.hammer {
  position: fixed;
  width: 60px;
  height: 60px;
  pointer-events: none;
  z-index: 200;
  display: none;
}
.float-effects {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 150;
  overflow: hidden;
}
.float-text {
  position: absolute;
  font-size: var(--fs-xl);
  font-weight: 800;
  text-shadow: 0 2px 0 rgba(0,0,0,.1);
  animation: float-up 1s ease-out forwards;  /* 关键帧定义在 animations.css */
}
.float-text.correct { color: var(--success-deep); }
.float-text.wrong { color: var(--wrong); }
.coin-particle {
  position: absolute;
  font-size: 24px;
  pointer-events: none;
  animation: coin-fly 1.2s ease-out forwards;
}
@keyframes coin-fly {
  0%   { opacity: 1; transform: translate(0,0) scale(0); }
  30%  { opacity: 1; transform: translate(var(--dx,30px), var(--dy,-40px)) scale(1.2); }
  100% { opacity: 0; transform: translate(calc(var(--dx,30px) * 2), calc(var(--dy,-40px) * 1.5)) scale(.6); }
}

/* ========== Screen 6：暂停菜单 ========== */
.pause-panel {
  background: var(--card);
  border-radius: var(--r-xl);
  padding: var(--sp-6);
  width: min(320px, 88vw);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-3);
  box-shadow: 0 20px 60px rgba(0,0,0,.2);
}
.pause-panel h2 {
  font-size: var(--fs-xl);
  font-weight: 700;
  margin-bottom: var(--sp-2);
}
.pause-panel .btn-primary,
.pause-panel .btn-secondary {
  width: 100%;
}

/* ========== Screen 7：结算画面 ========== */
#screen-result {
  display: none;
  flex-direction: column;
  background: linear-gradient(180deg, #FFE9A8 0%, #FFF8E7 100%);
  position: relative;
  overflow: hidden;
}
#screen-result.active { display: flex; }
#screen-result .bg-sky { display: none; }
.result-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--sp-5) var(--sp-4) var(--sp-4);
  position: relative;
  z-index: 2;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.mole-result {
  width: 90px; height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--sp-2);
}
.mole-result .mole-body {
  width: 90px; height: 90px;
  animation: none;
}
.result-panel {
  width: 100%;
  max-width: 360px;
  background: var(--card);
  border-radius: var(--r-lg);
  padding: var(--sp-4);
  box-shadow: var(--shadow-card);
  text-align: center;
  margin-bottom: var(--sp-3);
}
.result-panel h2 {
  font-size: var(--fs-lg);
  font-weight: 800;
  color: var(--text);
  margin-bottom: var(--sp-2);
}
.stars-row {
  display: flex;
  justify-content: center;
  gap: var(--sp-2);
  margin-bottom: var(--sp-3);
  font-size: 28px;
}
.star { opacity: .25; transition: opacity .3s; }
.star:not(.empty) { opacity: 1; animation: star-pop .4s ease-out; }  /* 关键帧定义在 animations.css */
.result-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-2);
  margin-top: var(--sp-3);
  padding-top: var(--sp-3);
  border-top: 1px solid var(--border-soft);
}
.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.stat-num {
  font-size: var(--fs-lg);
  font-weight: 800;
  color: var(--text);
}
.stat span:last-child {
  font-size: var(--fs-xs);
  color: var(--text-soft);
}
.result-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-2);
  width: 100%;
  max-width: 360px;
  margin-bottom: var(--sp-3);
}
.result-buttons .btn-primary,
.result-buttons .btn-secondary {
  font-size: var(--fs-xs);
  padding: 12px 8px;
}
.achievements-area {
  width: 100%;
  max-width: 360px;
  background: var(--card);
  border-radius: var(--r-md);
  padding: var(--sp-3);
  text-align: center;
  box-shadow: var(--shadow-card);
}
.achievements-label {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--sp-2);
}
.achievements-badges {
  display: flex;
  justify-content: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
}
.confetti-container {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

/* ========== Screen 8：单词回顾 ========== */
#screen-review {
  display: none;
  flex-direction: column;
}
#screen-review.active { display: flex; }
.review-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-4);
  -webkit-overflow-scrolling: touch;
}
.review-section { margin-bottom: var(--sp-5); }
.review-label {
  font-size: var(--fs-sm);
  font-weight: 700;
  margin-bottom: var(--sp-3);
  padding: 6px 12px;
  border-radius: var(--r-pill);
  display: inline-block;
}
.review-label.correct { background: rgba(78,205,196,.18); color: var(--success-deep); }
.review-label.wrong { background: rgba(255,107,107,.18); color: var(--accent); }
.review-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-2);
}
.review-card {
  background: var(--card);
  border-radius: var(--r-md);
  padding: var(--sp-3);
  text-align: center;
  box-shadow: var(--shadow-sm);
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.review-card .card-img { font-size: 28px; }
.review-card .card-en {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--text);
}
.review-card .card-zh {
  font-size: var(--fs-xs);
  color: var(--text-soft);
}
.review-card .card-speak {
  position: absolute;
  top: 6px; right: 6px;
  font-size: var(--fs-xs);
  background: var(--bg);
  width: 24px; height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}
.review-card.wrong-card {
  border: 2px solid var(--accent);
}
.review-footer {
  display: flex;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4) calc(var(--sp-3) + var(--safe-bottom));
  background: var(--card);
  border-top: 1px solid var(--border-soft);
  flex-shrink: 0;
}
.review-footer .btn-secondary { flex: 1; }
.review-footer .btn-primary { flex: 1; }

/* ========== Screen：错题本 ========== */
#screen-mistakes {
  display: none;
  flex-direction: column;
}
#screen-mistakes.active { display: flex; }
.mistakes-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-4);
  -webkit-overflow-scrolling: touch;
}
.mistakes-info {
  text-align: center;
  padding: var(--sp-7) var(--sp-4);
  font-size: var(--fs-sm);
  color: var(--text-soft);
}
.mistakes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-3);
}
.mistake-card {
  background: var(--card);
  border-radius: var(--r-md);
  padding: var(--sp-3);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 2px solid rgba(255,107,107,.3);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.mistake-card .card-img { font-size: 28px; }
.mistake-card .card-en { font-size: var(--fs-sm); font-weight: 700; }
.mistake-card .card-zh { font-size: var(--fs-xs); color: var(--text-soft); }
.mistakes-footer {
  display: flex;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4) calc(var(--sp-3) + var(--safe-bottom));
  background: var(--card);
  border-top: 1px solid var(--border-soft);
  flex-shrink: 0;
}
.mistakes-footer .btn-secondary { flex: 1; }
.mistakes-footer .btn-primary { flex: 2; }

/* ========== Screen：家长面板 ========== */
#screen-parent {
  display: none;
  flex-direction: column;
}
#screen-parent.active { display: flex; }
.parent-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-4);
  -webkit-overflow-scrolling: touch;
}
.stat-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
}
.stat-cards > div,
.parent-content .stat-card {
  background: var(--card);
  border-radius: var(--r-md);
  padding: var(--sp-3);
  text-align: center;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.parent-content .parent-section {
  background: var(--card);
  border-radius: var(--r-lg);
  padding: var(--sp-4);
  margin-bottom: var(--sp-3);
  box-shadow: var(--shadow-sm);
}
.parent-content .parent-section h3 {
  font-size: var(--fs-sm);
  font-weight: 700;
  margin-bottom: var(--sp-3);
  color: var(--text);
}
.parent-achievements {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-2);
}
.badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: var(--sp-2);
  background: var(--bg);
  border-radius: var(--r-sm);
  font-size: 24px;
  opacity: .35;
  filter: grayscale(.8);
  transition: opacity .2s, filter .2s;
}
.badge.unlocked {
  opacity: 1;
  filter: none;
  background: #FFF9E0;
}
.badge .badge-title {
  font-size: var(--fs-xs);
  color: var(--text);
  font-weight: 600;
}
.parent-mistakes {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}
.mistake-stat-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-3);
  background: var(--bg);
  border-radius: var(--r-sm);
}
.mistake-stat-card .card-en { font-weight: 700; color: var(--text); }
.mistake-stat-card .card-zh { color: var(--text-soft); font-size: var(--fs-xs); }

/* ========== Screen 9：设置面板 ========== */
.settings-panel {
  background: var(--card);
  border-radius: var(--r-xl);
  width: min(380px, 92vw);
  max-height: 88vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0,0,0,.2);
}
.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-4);
  border-bottom: 1px solid var(--border-soft);
}
.settings-header h2 {
  font-size: var(--fs-lg);
  font-weight: 700;
}
.settings-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-3) var(--sp-4) var(--sp-4);
  -webkit-overflow-scrolling: touch;
}
.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--border-soft);
  gap: var(--sp-3);
}
.setting-row:last-child { border-bottom: none; }
.setting-row label {
  font-size: var(--fs-sm);
  color: var(--text);
  font-weight: 500;
  flex-shrink: 0;
}
.setting-row input[type="range"] {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg);
  border-radius: var(--r-pill);
  outline: none;
}
.setting-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;
  background: var(--primary);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}
.toggle {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: var(--border-soft);
  border-radius: var(--r-pill);
  transition: background .2s;
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
  left: 3px; top: 3px;
  background: #FFF;
  border-radius: 50%;
  transition: transform .2s;
  box-shadow: 0 2px 4px rgba(0,0,0,.15);
}
.toggle input:checked + .toggle-slider {
  background: var(--success);
}
.toggle input:checked + .toggle-slider::before {
  transform: translateX(20px);
}
.setting-row.danger {
  padding-top: var(--sp-4);
  border-top: 1px solid var(--border-soft);
  margin-top: var(--sp-2);
}

/* ========== 关于弹窗（btn-about） ========== */
/* 关于没有专门 screen，js 弹出 alert；不需要样式 */

/* ========== 响应式（平板+） ========== */
@media (min-width: 768px) {
  .holes-grid { gap: var(--sp-3); }
  .chapter-card { min-height: 130px; padding: var(--sp-5); }
  .word-cards { grid-template-columns: repeat(3, 1fr); }
  .review-grid { grid-template-columns: repeat(3, 1fr); }
  .mistakes-grid { grid-template-columns: repeat(3, 1fr); }
  .category-grid { grid-template-columns: repeat(3, 1fr); }
  .level-grid { grid-template-columns: repeat(5, 1fr); }
}
@media (min-width: 1024px) {
  .word-cards { grid-template-columns: repeat(4, 1fr); }
  .review-grid { grid-template-columns: repeat(4, 1fr); }
  .mistakes-grid { grid-template-columns: repeat(4, 1fr); }
  .category-grid { grid-template-columns: repeat(4, 1fr); }
  .level-grid { grid-template-columns: repeat(6, 1fr); }
}

/* ========== 护眼模式 ========== */
body.eye-care {
  background: var(--eye-care-bg);
  color: var(--eye-care-text);
}
body.eye-care .screen { background: var(--eye-care-bg); }
body.eye-care .top-bar,
body.eye-care .map-footer,
body.eye-care .level-footer,
body.eye-care .review-footer,
body.eye-care .mistakes-footer {
  background: var(--eye-care-card);
  border-color: rgba(255,255,255,.1);
}
body.eye-care .top-title,
body.eye-care .game-title { color: var(--eye-care-text); }
body.eye-care .chapter-card,
body.eye-care .word-card,
body.eye-care .level-item,
body.eye-care .category-card,
body.eye-care .review-card,
body.eye-care .mistake-card,
body.eye-care .result-panel,
body.eye-care .parent-content .parent-section,
body.eye-care .parent-content .stat-card,
body.eye-care .badge,
body.eye-care .mistake-stat-card,
body.eye-care .achievements-area,
body.eye-care .target-word {
  background: var(--eye-care-card);
  color: var(--eye-care-text);
}
body.eye-care .chapter-card .ch-name,
body.eye-care .word-card .wc-en,
body.eye-care .review-card .card-en,
body.eye-care .mistake-card .card-en,
body.eye-care .level-item,
body.eye-care .target-word,
body.eye-care .game-info > span { color: var(--eye-care-text); }
body.eye-care .btn-primary,
body.eye-care .btn-secondary,
body.eye-care .btn-icon {
  background: var(--eye-care-card);
  color: var(--eye-care-text);
}
body.eye-care #screen-splash {
  background: linear-gradient(180deg, #2A2A3E 0%, #1A1A28 100%);
}
body.eye-care #screen-game {
  background: linear-gradient(180deg, #2A3E3A 0%, #1A2828 100%);
}
body.eye-care #screen-result {
  background: linear-gradient(180deg, #2A2A3E 0%, #1A1A28 100%);
}