/* ============================================
   安安学习乐园 - 活泼幼儿风格
   ============================================ */
:root {
  --coral:  #FF6B6B;
  --orange: #FF9F43;
  --yellow: #FFC93C;
  --green:  #2ECC71;
  --teal:   #1DD3B0;
  --blue:   #4DA8FF;
  --purple: #A78BFA;
  --pink:   #FF7EB3;
  --ink:    #4A3B2A;
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html { font-size: 16px; }

body {
  font-family: "Comic Sans MS", "幼圆", "YouYuan", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #8BD5FF 0%, #C9EFFF 40%, #E4FFF2 75%, #D6F9C9 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

button, a { touch-action: manipulation; }

/* ---------- 天空装饰 ---------- */
.deco { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }

.sun {
  position: absolute; top: 14px; right: 16px;
  font-size: 64px;
  animation: spinSlow 18s linear infinite;
  filter: drop-shadow(0 0 18px rgba(255, 220, 80, .9));
}
@keyframes spinSlow { to { transform: rotate(360deg); } }

.cloud { position: absolute; opacity: .9; animation: drift linear infinite; }
.c1 { font-size: 52px; top: 8%;  animation-duration: 46s; }
.c2 { font-size: 40px; top: 22%; animation-duration: 62s; animation-delay: -30s; }
.c3 { font-size: 60px; top: 4%;  animation-duration: 78s; animation-delay: -55s; }
@keyframes drift {
  from { left: -120px; }
  to   { left: 110%; }
}

.balloon { position: absolute; font-size: 40px; animation: floaty 5s ease-in-out infinite alternate; }
.b1 { top: 30%; animation-duration: 5.5s; }
.b2 { top: 48%; animation-duration: 7s; animation-delay: -2s; }
@keyframes floaty { from { transform: translateY(0) rotate(-4deg); } to { transform: translateY(-26px) rotate(5deg); } }

/* ---------- 布局 ---------- */
.wrap { position: relative; z-index: 1; max-width: 820px; margin: 0 auto; padding: 22px 18px 30px; }

/* ---------- 首页头部 ---------- */
.home-header { text-align: center; margin-bottom: 26px; }

.star-pill {
  display: inline-block;
  background: #fff;
  border: 3px solid var(--yellow);
  border-radius: 999px;
  padding: 6px 18px;
  font-size: 17px;
  font-weight: bold;
  box-shadow: 0 4px 0 rgba(0,0,0,.08);
  margin-bottom: 14px;
}

.rainbow-title { font-size: clamp(30px, 7vw, 48px); letter-spacing: 6px; line-height: 1.2; }
.rainbow-title span { display: inline-block; animation: hop 2.4s ease-in-out infinite; text-shadow: 0 3px 0 rgba(255,255,255,.8); }
.rainbow-title span:nth-child(1) { color: #FF4757; animation-delay: 0s; }
.rainbow-title span:nth-child(2) { color: #FF9F1C; animation-delay: .15s; }
.rainbow-title span:nth-child(3) { color: #2ECC71; animation-delay: .3s; }
.rainbow-title span:nth-child(4) { color: #1E90FF; animation-delay: .45s; }
.rainbow-title span:nth-child(5) { color: #9B59B6; animation-delay: .6s; }
.rainbow-title span:nth-child(6) { color: #FF7EB3; animation-delay: .75s; }
@keyframes hop { 0%,100% { transform: translateY(0); } 30% { transform: translateY(-10px); } 50% { transform: translateY(0); } }

.subtitle { margin-top: 10px; font-size: 17px; color: #3A6EA5; font-weight: bold; }

/* ---------- 方格按钮（App 图标风） ---------- */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 20px;
}

.app-btn {
  aspect-ratio: 1;
  border-radius: 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
  color: #fff;
  cursor: pointer;
  user-select: none;
  box-shadow: 0 9px 0 rgba(0,0,0,.14), inset 0 -7px 0 rgba(0,0,0,.10), inset 0 4px 0 rgba(255,255,255,.35);
  transition: transform .16s ease, box-shadow .16s ease;
}
.app-btn:active { transform: translateY(6px) scale(.97); box-shadow: 0 3px 0 rgba(0,0,0,.14), inset 0 -4px 0 rgba(0,0,0,.10); }

.app-btn .icon { font-size: clamp(44px, 9vw, 58px); filter: drop-shadow(0 4px 3px rgba(0,0,0,.18)); animation: bobble 3.2s ease-in-out infinite alternate; }
@keyframes bobble { from { transform: translateY(0); } to { transform: translateY(-6px); } }

.app-btn .label { font-size: 18px; font-weight: bold; letter-spacing: 1px; text-shadow: 0 2px 0 rgba(0,0,0,.15); }

.app-btn .badge {
  font-size: 12px;
  background: rgba(255,255,255,.92);
  color: #E8590C;
  border-radius: 999px;
  padding: 3px 12px;
  font-weight: bold;
}

.c-blue   { background: linear-gradient(160deg, #6FB9FF, #3D8BFF); }
.c-orange { background: linear-gradient(160deg, #FFB562, #FF8C1A); }
.c-green  { background: linear-gradient(160deg, #55DDA0, #1FBF6E); }
.c-pink   { background: linear-gradient(160deg, #FF9ECD, #FF5FA8); }
.c-purple { background: linear-gradient(160deg, #C4A8FF, #8E6BFF); }
.c-red    { background: linear-gradient(160deg, #FF8787, #F03E3E); }
.c-teal   { background: linear-gradient(160deg, #5CE8CB, #0FBFA0); }
.c-yellow { background: linear-gradient(160deg, #FFDF70, #FFB900); }
.c-yellow .label { color: #6B4A00; text-shadow: 0 2px 0 rgba(255,255,255,.4); }
.c-yellow .badge { color: #B35C00; }

/* 上线课件呼吸光圈 */
.pop { animation: glowPulse 2s ease-in-out infinite; }
@keyframes glowPulse {
  0%, 100% { box-shadow: 0 9px 0 rgba(0,0,0,.14), 0 0 0 0 rgba(255,255,255,.75), inset 0 -7px 0 rgba(0,0,0,.10); }
  50%      { box-shadow: 0 9px 0 rgba(0,0,0,.14), 0 0 0 14px rgba(255,255,255,0), inset 0 -7px 0 rgba(0,0,0,.10); }
}

/* 敬请期待 */
.soon { filter: saturate(.55); opacity: .8; cursor: default; }
.soon .icon { animation: none; }
.soon .badge { background: rgba(255,255,255,.75); color: #777; }

/* ---------- 页脚 ---------- */
.home-footer { margin-top: 34px; text-align: center; font-size: 15px; color: #4F7A5B; }
.home-footer .copy { margin-top: 6px; font-size: 13px; color: #7FA98B; }

/* ============================================
   课件页（math10 等）
   ============================================ */
body.course {
  background: linear-gradient(180deg, #FFE9A8 0%, #FFD6E8 45%, #D6F0FF 100%);
}

.quiz-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  max-width: 640px;
  margin: 0 auto;
  padding: 16px 4px 6px;
  position: relative;
  z-index: 1;
}

.btn-home {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #fff;
  border: 3px solid var(--blue);
  color: #1E6FCC;
  font-size: 16px;
  font-weight: bold;
  padding: 8px 16px;
  border-radius: 999px;
  text-decoration: none;
  box-shadow: 0 4px 0 rgba(30,111,204,.25);
  font-family: inherit;
}
.btn-home:active { transform: translateY(3px); box-shadow: none; }

.quiz-progress { flex: 1; text-align: center; }
.quiz-progress .p-label { font-size: 17px; font-weight: bold; color: #B34A00; }
.p-bar { height: 16px; background: rgba(255,255,255,.8); border-radius: 999px; margin-top: 6px; overflow: hidden; border: 2px solid #fff; }
.p-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, #FF9F1C, #2ECC71);
  border-radius: 999px;
  transition: width .45s cubic-bezier(.34,1.56,.64,1);
}

.quiz-score { font-size: 17px; font-weight: bold; background: #fff; border: 3px solid var(--pink); border-radius: 999px; padding: 7px 14px; white-space: nowrap; }

/* 屏幕切换 */
.screen { display: none; animation: screenIn .45s ease; }
.screen.active { display: block; }
@keyframes screenIn { from { opacity: 0; transform: translateY(16px) scale(.98); } to { opacity: 1; transform: none; } }

.quiz-wrap { max-width: 640px; margin: 0 auto; padding: 10px 18px 40px; position: relative; z-index: 1; }

/* 开始屏 */
.start-card {
  background: #fff;
  border: 6px dashed var(--yellow);
  border-radius: 34px;
  padding: 34px 22px;
  text-align: center;
  box-shadow: 0 12px 30px rgba(180,120,0,.12);
}
.start-card h2 { font-size: clamp(26px, 6vw, 36px); margin-bottom: 8px; }
.start-card .hint { color: #A06B1C; font-size: 16px; margin-bottom: 24px; font-weight: bold; }

.mode-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.mode-btn {
  font-family: inherit;
  border: none;
  border-radius: 24px;
  padding: 20px 6px;
  font-size: 19px;
  font-weight: bold;
  color: #fff;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  box-shadow: 0 7px 0 rgba(0,0,0,.15), inset 0 -6px 0 rgba(0,0,0,.10);
  transition: transform .15s;
}
.mode-btn .mi { font-size: 40px; }
.mode-btn:active { transform: translateY(5px); box-shadow: 0 2px 0 rgba(0,0,0,.15); }

/* 题目卡 */
.q-card {
  background: #fff;
  border-radius: 34px;
  border: 6px solid #FFF;
  outline: 5px dashed #FFB900;
  outline-offset: -16px;
  padding: 30px 16px 26px;
  text-align: center;
  box-shadow: 0 14px 34px rgba(180,120,0,.14);
  margin-top: 8px;
}

/* 图示算式：CSS 形状计数（不依赖 emoji 字体，任何设备不乱码） */
.q-shapes {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 9px 7px;
  min-height: 1.6em;
  padding: 4px 6px;
}
.q-shapes .u {
  width: clamp(17px, 4.6vw, 23px);
  height: clamp(17px, 4.6vw, 23px);
  background: var(--c, #FF6B6B);
  display: inline-block;
  border-radius: 4px;
  flex: 0 0 auto;
}
.q-shapes .sh-dot { border-radius: 50%; }
.q-shapes .sh-tri { border-radius: 0; clip-path: polygon(50% 0, 100% 100%, 0 100%); transform: scaleY(1.18); }
.q-shapes .sh-dia { border-radius: 0; clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%); }
.q-shapes .sh-star { border-radius: 0; clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%); }
.q-shapes .op {
  font-size: clamp(24px, 5.6vw, 30px);
  font-weight: bold;
  color: #FF6B6B;
  padding: 0 5px;
  line-height: 1;
}
.q-shapes .qm {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.7em;
  height: 1.7em;
  border: 3px dashed #E8590C;
  border-radius: 12px;
  background: #FFF3E4;
  color: #E8590C;
  font-size: clamp(20px, 5vw, 26px);
  font-weight: bold;
  animation: wiggle 1.1s ease-in-out infinite;
}
.q-shapes .ans-group { display: inline-flex; flex-wrap: wrap; gap: 7px; align-items: center; justify-content: center; max-width: 100%; }
.q-shapes .ans-pop { animation: popIn .45s cubic-bezier(.34,1.8,.64,1); }
@keyframes wiggle { 0%,100% { transform: rotate(-8deg) scale(1); } 50% { transform: rotate(8deg) scale(1.15); } }

.q-numeric {
  font-size: clamp(46px, 11vw, 64px);
  font-weight: bold;
  margin-top: 12px;
  color: #2C3E7A;
  letter-spacing: 4px;
  font-variant-numeric: tabular-nums;
}
.q-numeric .ans-slot {
  display: inline-block;
  min-width: 1.2em;
  color: #E8590C;
}
.q-numeric .ans-slot.pop-in { animation: popIn .5s cubic-bezier(.34,1.8,.64,1); }
@keyframes popIn { from { transform: scale(0); } to { transform: scale(1); } }

/* 选项按钮 */
.options { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 26px; }
.opt-btn {
  font-family: inherit;
  border: none;
  border-radius: 22px;
  min-height: 84px;
  font-size: clamp(30px, 7vw, 40px);
  font-weight: bold;
  color: #fff;
  cursor: pointer;
  box-shadow: 0 7px 0 rgba(0,0,0,.15), inset 0 -5px 0 rgba(0,0,0,.10);
  transition: transform .13s, opacity .2s;
  font-variant-numeric: tabular-nums;
}
.opt-btn:active { transform: translateY(4px); box-shadow: 0 2px 0 rgba(0,0,0,.15); }
.opt-btn.o1 { background: linear-gradient(160deg, #FF8787, #F03E3E); }
.opt-btn.o2 { background: linear-gradient(160deg, #FFB562, #FF8C1A); }
.opt-btn.o3 { background: linear-gradient(160deg, #6FB9FF, #3D8BFF); }
.opt-btn.o4 { background: linear-gradient(160deg, #C4A8FF, #8E6BFF); }
.opt-btn.correct { background: linear-gradient(160deg, #7BED9F, #2ED573) !important; animation: popIn .4s; }
.opt-btn.wrong { background: #CFCFCF !important; opacity: .65; animation: shake .4s; }
.opt-btn:disabled { cursor: default; }
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20% { transform: translateX(-8px); } 40% { transform: translateX(8px); }
  60% { transform: translateX(-5px); } 80% { transform: translateX(5px); }
}

/* 反馈气泡 */
.feedback {
  margin-top: 18px;
  min-height: 42px;
  font-size: 24px;
  font-weight: bold;
  animation: popIn .35s;
}
.feedback.good { color: #1E8E4E; }
.feedback.bad  { color: #E8590C; }

/* 结果屏 */
.result-card {
  background: #fff;
  border: 6px solid #FFF;
  outline: 5px dashed #FF7EB3;
  outline-offset: -16px;
  border-radius: 34px;
  padding: 36px 20px 30px;
  text-align: center;
  box-shadow: 0 14px 34px rgba(200,80,120,.14);
}
.result-stars { font-size: 62px; letter-spacing: 8px; min-height: 74px; }
.result-stars .s { display: inline-block; opacity: 0; transform: scale(0); }
.result-stars .s.on { animation: starPop .55s cubic-bezier(.34,1.8,.64,1) forwards; }
.result-stars .s.off { opacity: .35; transform: none; animation: none; }
@keyframes starPop { from { opacity: 0; transform: scale(0) rotate(-180deg); } to { opacity: 1; transform: scale(1) rotate(0); } }

.result-msg { font-size: clamp(24px, 6vw, 32px); font-weight: bold; margin: 10px 0 6px; color: #C0398D; }
.result-detail { font-size: 17px; color: #7A6A52; margin-bottom: 24px; }

.result-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.action-btn { flex: 1; min-width: 130px; }
.action-btn {
  font-family: inherit;
  border: none;
  border-radius: 999px;
  padding: 16px 10px;
  font-size: 19px;
  font-weight: bold;
  color: #fff;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 6px 0 rgba(0,0,0,.15), inset 0 -5px 0 rgba(0,0,0,.10);
  transition: transform .13s;
}
.action-btn:active { transform: translateY(4px); box-shadow: 0 2px 0 rgba(0,0,0,.15); }
.action-btn.again { background: linear-gradient(160deg, #FFB562, #FF8C1A); }
.action-btn.gohome { background: linear-gradient(160deg, #6FB9FF, #3D8BFF); }

/* 彩带 */
#confetti { position: fixed; inset: 0; pointer-events: none; z-index: 50; overflow: hidden; }
#confetti i {
  position: absolute;
  width: 12px; height: 12px;
  border-radius: 3px;
  animation: fall 1.25s ease-in forwards;
}
@keyframes fall {
  from { transform: translate(0, 0) rotate(0); opacity: 1; }
  to   { transform: translate(var(--dx, 0), 62vh) rotate(var(--rot, 540deg)); opacity: 0; }
}

/* 窄屏适配 */
@media (max-width: 420px) {
  .q-shapes { gap: 7px 5px; }
  .options { gap: 10px; }
  .opt-btn { min-height: 74px; border-radius: 18px; }
  .mode-row { grid-template-columns: 1fr; }
  .mode-btn { flex-direction: row; justify-content: center; padding: 16px 6px; }
  .result-actions { flex-direction: column; }
}

/* ============================================
   通用课件引擎组件（所有课程共用）
   ============================================ */

/* 题面区 */
.prompt-area { min-height: 120px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; padding: 6px 0; }

/* 大字展示（汉字/字母/拼音） */
.big-char { font-size: clamp(64px, 17vw, 100px); font-weight: bold; color: #2C3E7A; line-height: 1.15; }
.big-char.py { font-size: clamp(44px, 11vw, 64px); color: #C0392D; letter-spacing: 2px; }

/* 颜色课：大色块 */
.color-view {
  width: clamp(110px, 28vw, 150px);
  height: clamp(110px, 28vw, 150px);
  border-radius: 42% 58% 55% 45% / 50% 44% 56% 50%;
  border: 5px solid #fff;
  box-shadow: 0 8px 20px rgba(0,0,0,.16);
}
.opt-inner .swatch {
  width: 56px; height: 56px; border-radius: 50%;
  display: inline-block;
  border: 4px solid #fff;
  box-shadow: 0 3px 8px rgba(0,0,0,.22);
}

/* 形状课：CSS 形状（通用，不限 .q-shapes 内） */
.shp { display: inline-block; background: var(--c, #FF6B6B); border-radius: 4px; }
.shp.dot { border-radius: 50%; }
.shp.tri { border-radius: 0; clip-path: polygon(50% 0, 100% 100%, 0 100%); transform: scaleY(1.15); }
.shp.dia { border-radius: 0; clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%); }
.shp.star { border-radius: 0; clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%); }
.shp.heart { border-radius: 0; clip-path: polygon(50% 92%, 8% 55%, 8% 25%, 28% 8%, 50% 20%, 72% 8%, 92% 25%, 92% 55%); }
.shp.oval { border-radius: 50%; width: 1.55em; height: 1em; }
.shp.rect { border-radius: 3px; width: 1.6em; height: 1em; }
.shp.pent { border-radius: 0; clip-path: polygon(50% 0%, 100% 38%, 82% 100%, 18% 100%, 0% 38%); }
.shp.hex { border-radius: 0; clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%); }
.shape-view .shp { width: clamp(64px, 16vw, 90px); height: clamp(64px, 16vw, 90px); font-size: 20px; }
.opt-shp { width: 44px; height: 44px; font-size: 12px; }

/* 动物课：SVG */
svg.animal { width: clamp(140px, 32vw, 185px); height: auto; }

/* 古诗课 */
.poem-line { font-size: clamp(26px, 6.6vw, 34px); font-weight: bold; color: #8E44AD; letter-spacing: 3px; }
.poem-sub { font-size: 15px; color: #A06B1C; font-weight: bold; }
.blank { color: #E8590C; }

/* 儿歌课：播放按钮 */
.play-btn {
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: linear-gradient(160deg, #55DDA0, #1FBF6E);
  color: #fff;
  font-size: 22px;
  font-weight: bold;
  border: none;
  border-radius: 999px;
  padding: 16px 34px;
  cursor: pointer;
  box-shadow: 0 7px 0 rgba(0,0,0,.15), inset 0 -5px 0 rgba(0,0,0,.10);
  transition: transform .13s;
  margin: 8px 0;
}
.play-btn:active { transform: translateY(4px); box-shadow: 0 2px 0 rgba(0,0,0,.15); }
.play-btn .tri {
  width: 0; height: 0;
  border-left: 20px solid #fff;
  border-top: 13px solid transparent;
  border-bottom: 13px solid transparent;
}
.play-btn.playing { background: linear-gradient(160deg, #FFB562, #FF8C1A); }
.lyric-line { font-size: clamp(20px, 5.2vw, 26px); font-weight: bold; color: #0E7490; letter-spacing: 1px; }

/* 文字型选项（诗歌/歌名等较长选项）：2x2 */
.options.opt-text { grid-template-columns: 1fr 1fr; }
.options.opt-text .opt-btn { min-height: 64px; font-size: clamp(20px, 5vw, 26px); }

/* 答案讲解框（答对/答错后显示完整知识点） */
.q-note {
  margin-top: 14px;
  background: #FFF8E7;
  border: 3px dashed #FFC93C;
  border-radius: 16px;
  padding: 10px 14px;
  font-size: 20px;
  font-weight: bold;
  color: #7A5A00;
  display: none;
}
.q-note.show { display: block; animation: popIn .4s; }

/* 错题复习 */
.review-box { margin: 6px 0 20px; text-align: left; }
.rv-title { font-size: 20px; font-weight: bold; color: #C0392D; margin-bottom: 10px; text-align: center; }
.rv-item {
  background: #FFF4F4;
  border: 3px solid #FFD3D3;
  border-radius: 16px;
  padding: 10px 12px;
  margin-bottom: 10px;
}
.rv-item .rv-prompt { display: flex; flex-direction: column; align-items: center; gap: 4px; font-size: 17px; color: #5A4A3A; }
.rv-item .rv-prompt .big-char { font-size: 40px; }
.rv-item .rv-prompt .color-view { width: 44px; height: 44px; border-width: 3px; }
.rv-item .rv-prompt .shape-view .shp { width: 36px; height: 36px; }
.rv-item .rv-prompt .q-shapes { gap: 5px 4px; min-height: 0; padding: 0; }
.rv-item .rv-prompt .q-shapes .u { width: 14px; height: 14px; }
.rv-item .rv-prompt .q-numeric { font-size: 26px; margin-top: 2px; }
.rv-item .rv-prompt .poem-line { font-size: 19px; letter-spacing: 1px; }
.rv-item .rv-prompt .lyric-line { font-size: 17px; }
.rv-item .rv-prompt .play-btn { display: none; }
.rv-item svg.animal { width: 64px; height: auto; }
.rv-ans { text-align: center; font-size: 17px; font-weight: bold; color: #1E8E4E; margin-top: 6px; }
.rv-none {
  text-align: center;
  font-size: 18px;
  font-weight: bold;
  color: #1E8E4E;
  background: #EFFFEF;
  border: 3px solid #C8F5C8;
  border-radius: 16px;
  padding: 12px;
  margin-bottom: 20px;
}

/* 错题重练按钮 */
.action-btn.redo { background: linear-gradient(160deg, #C4A8FF, #8E6BFF); }

/* 数学：整捆表示（10 一捆的药丸标签，配合零散形状） */
.q-shapes .u.bundle {
  width: auto;
  min-width: 46px;
  height: 26px;
  border-radius: 13px;
  color: #fff;
  font-size: 15px;
  font-weight: bold;
  font-style: normal;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
  letter-spacing: 1px;
  box-shadow: inset 0 -3px 0 rgba(0,0,0,.12);
}
.rv-item .q-shapes .u.bundle { min-width: 32px; height: 18px; border-radius: 9px; font-size: 11px; padding: 0 6px; }

/* 英语句子填空 */
.sent-line { font-size: clamp(22px, 5.8vw, 30px); font-weight: bold; color: #1E6FCC; letter-spacing: 1px; line-height: 1.5; }
.sent-line .blank { color: #E8590C; letter-spacing: 2px; }

/* 钟表课配色按钮 + 长句选项（单列） */
.c-cyan { background: linear-gradient(160deg, #7EE8FA, #0891B2); }
.options.opt-sent { grid-template-columns: 1fr; }
.options.opt-sent .opt-btn { min-height: 52px; font-size: clamp(17px, 4.4vw, 22px); }
.rv-item .rv-prompt .sent-line { font-size: 17px; }
.rv-item svg.animal { width: 84px; }