/* LearnMusic · 幻灯片引擎样式（PPT 式全屏课件）
 * 儿童友好 + 高级感：暖色渐变、超大字号、大圆角。
 * 仅课件页引入本文件（主页不引入，避免 overflow:hidden 影响滚动）。
 */

:root {
  --s-amber: #ffc94d;
  --s-orange: #ff8f5e;
  --s-pink: #ff7eb6;
  --s-mint: #5eead4;
  --s-sky: #7cc7ff;
  --s-violet: #b79cff;
  --s-ink: #f4f2ff;
  --s-ink-dim: rgba(244, 242, 255, 0.72);
  --s-card: rgba(255, 255, 255, 0.08);
  --s-card-border: rgba(255, 255, 255, 0.16);
}

html, body {
  height: 100%;
  overflow: hidden; /* 全屏不滚动 */
}

body {
  font-family: "PingFang SC", "Yuanti SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-weight: 600;
}

/* ---- 幻灯片页 ---- */
.slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 72px 6vw 132px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(28px) scale(0.985);
  transition: opacity 0.45s ease, transform 0.45s ease, visibility 0s linear 0.45s;
  overflow: hidden;
}
.slide.active {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition: opacity 0.45s ease, transform 0.45s ease;
  z-index: 2;
}

.slide-inner {
  position: relative;
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  text-align: center;
  z-index: 2;
}

.slide h1 {
  margin: 0 0 20px;
  font-size: clamp(46px, 7.5vw, 100px);
  font-weight: 800;
  letter-spacing: 3px;
  color: var(--s-ink);
  text-shadow: 0 6px 30px rgba(0, 0, 0, 0.35);
}
.slide h2 {
  margin: 0 0 18px;
  font-size: clamp(34px, 5vw, 66px);
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--s-ink);
}
.slide p {
  margin: 10px 0;
  font-size: clamp(22px, 3.2vw, 40px);
  line-height: 1.6;
  color: var(--s-ink);
}
.slide .dim { color: var(--s-ink-dim); font-size: clamp(18px, 2.2vw, 28px); }
.slide .accent { color: var(--s-amber); }
.slide .pink { color: var(--s-pink); }
.slide .mint { color: var(--s-mint); }
.slide .sky { color: var(--s-sky); }
.slide .violet { color: var(--s-violet); }

/* 进入级联动画：JS 给 [data-anim] 逐个加 .anim-in 并设置 transition-delay */
[data-anim] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
[data-anim].anim-in { opacity: 1; transform: none; }

/* ---- 解说喇叭按钮（每页右上角，由引擎注入） ---- */
.lm-tts-btn {
  position: absolute;
  top: 20px;
  right: 22px;
  z-index: 6;
  width: 62px;
  height: 62px;
  border-radius: 50%;
  border: 2px solid var(--s-card-border);
  background: var(--s-card);
  font-size: 27px;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}
.lm-tts-btn:hover { transform: scale(1.1); background: rgba(255, 255, 255, 0.18); }
.lm-tts-btn.playing {
  background: var(--s-amber);
  border-color: var(--s-amber);
  animation: tts-pulse 1.1s ease-in-out infinite;
}
@keyframes tts-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 201, 77, 0.5); }
  50% { box-shadow: 0 0 0 14px rgba(255, 201, 77, 0); }
}

/* ---- 顶部进度条 ---- */
.lm-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  z-index: 20;
}
.lm-progress-bar {
  height: 100%;
  width: 0;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(90deg, var(--s-amber), var(--s-pink));
  transition: width 0.4s ease;
}

/* ---- 底部导航条 ---- */
.lm-nav {
  position: fixed;
  bottom: 20px;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  z-index: 20;
}
.lm-nav-btn {
  width: 66px;
  height: 66px;
  border-radius: 50%;
  border: none;
  font-size: 26px;
  color: #3a1c00;
  background: linear-gradient(135deg, var(--s-amber), var(--s-orange));
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  transition: transform 0.12s ease, opacity 0.12s ease;
}
.lm-nav-btn:hover { transform: scale(1.08); }
.lm-nav-btn:disabled { opacity: 0.3; cursor: default; transform: none; }
.lm-dots { display: flex; gap: 9px; align-items: center; }
.lm-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: none;
  padding: 0;
  background: rgba(255, 255, 255, 0.28);
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}
.lm-dot.active { background: var(--s-amber); transform: scale(1.35); }

/* ---- 通用大按钮 ---- */
.btn-big {
  display: inline-block;
  border: none;
  border-radius: 999px;
  padding: 18px 52px;
  margin: 14px 8px 0;
  font-family: inherit;
  font-size: clamp(24px, 3vw, 38px);
  font-weight: 800;
  letter-spacing: 2px;
  color: #3a1c00;
  background: linear-gradient(135deg, var(--s-amber), var(--s-orange));
  cursor: pointer;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  transition: transform 0.12s ease, filter 0.12s ease;
}
.btn-big:hover { transform: scale(1.05); filter: brightness(1.06); }
.btn-big:active { transform: scale(0.97); }
.btn-big.alt { background: linear-gradient(135deg, var(--s-mint), var(--s-sky)); color: #05303a; }
.btn-big.ghost {
  background: var(--s-card);
  border: 2px solid var(--s-card-border);
  color: var(--s-ink);
  box-shadow: none;
}

/* 超大表情按钮（🐦/🐘、😊/😢） */
.choice-row {
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: 34px;
  flex-wrap: wrap;
  margin-top: 22px;
}
.huge-btn {
  border: 3px solid var(--s-card-border);
  background: var(--s-card);
  border-radius: 36px;
  padding: 26px 46px;
  font-family: inherit;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.huge-btn .emoji { display: block; font-size: clamp(72px, 11vw, 130px); line-height: 1.15; }
.huge-btn .cap { display: block; font-size: clamp(22px, 2.6vw, 32px); color: var(--s-ink); margin-top: 8px; }
.huge-btn:hover { transform: translateY(-6px) scale(1.03); background: rgba(255, 255, 255, 0.16); }
.huge-btn:active { transform: scale(0.96); }
.huge-btn.correct { border-color: var(--s-mint); background: rgba(94, 234, 212, 0.2); }
.huge-btn.wrong { border-color: var(--s-pink); background: rgba(255, 126, 182, 0.2); }

/* ---- 封面漂浮音符 ---- */
.float-note {
  position: absolute;
  z-index: 1;
  font-size: clamp(34px, 5vw, 64px);
  opacity: 0.55;
  animation: floaty 7s ease-in-out infinite;
  pointer-events: none;
}
@keyframes floaty {
  0%, 100% { transform: translateY(0) rotate(-8deg); }
  50% { transform: translateY(-34px) rotate(10deg); }
}

/* ---- 声波纹（第 2 页） ---- */
.ripple-box {
  position: relative;
  width: 220px;
  height: 220px;
  margin: 26px auto 0;
}
.ripple-box .bell {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 92px;
}
.ripple {
  position: absolute;
  inset: 0;
  border: 4px solid var(--s-sky);
  border-radius: 50%;
  opacity: 0;
  animation: ripple-out 2.6s ease-out infinite;
}
.ripple:nth-child(2) { animation-delay: 0.85s; }
.ripple:nth-child(3) { animation-delay: 1.7s; }
@keyframes ripple-out {
  0% { transform: scale(0.45); opacity: 0.9; }
  100% { transform: scale(1.6); opacity: 0; }
}

/* ---- 音高大滑块（第 4 页） ---- */
.slider-wrap { margin-top: 30px; }
.slider-wrap .ends {
  display: flex;
  justify-content: space-between;
  max-width: 760px;
  margin: 0 auto 6px;
  font-size: clamp(20px, 2.4vw, 30px);
  color: var(--s-ink-dim);
}
.slider-big {
  -webkit-appearance: none;
  appearance: none;
  width: min(760px, 84vw);
  height: 34px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--s-violet), var(--s-sky), var(--s-mint), var(--s-amber));
  outline: none;
  cursor: pointer;
}
.slider-big::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: #fff;
  border: 6px solid var(--s-amber);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.4);
  cursor: grab;
}
.slider-big::-moz-range-thumb {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: #fff;
  border: 6px solid var(--s-amber);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.4);
  cursor: grab;
}

/* ---- 幻灯片里的键盘 ---- */
.slide .lm-kbd {
  height: 230px;
  max-width: 920px;
  margin: 26px auto 10px;
  border-radius: 18px;
  border: none;
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.4);
}
.slide .lm-kbd-fixed { margin-left: auto; margin-right: auto; }
.slide .lm-kbd-label { font-size: 14px; font-weight: 700; }
.slide .lm-kbd-black .lm-kbd-label { font-size: 12px; }

/* ---- 彩色楼梯（第 12 页） ---- */
.stairs {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 10px;
  margin-top: 26px;
}
.stair {
  width: clamp(64px, 9vw, 108px);
  border: none;
  border-radius: 16px 16px 8px 8px;
  font-family: inherit;
  font-size: clamp(18px, 2.2vw, 28px);
  font-weight: 800;
  color: rgba(0, 0, 0, 0.66);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 10px;
  transition: transform 0.12s ease, filter 0.12s ease;
}
.stair:hover { transform: translateY(-6px); filter: brightness(1.08); }
.stair:active { transform: scale(0.96); }
.stair .gap {
  font-size: clamp(13px, 1.6vw, 18px);
  color: rgba(0, 0, 0, 0.5);
  margin-top: 2px;
}

/* ---- 测验反馈 / 庆祝 ---- */
.feedback-big {
  min-height: 60px;
  margin-top: 18px;
  font-size: clamp(26px, 3.4vw, 44px);
  font-weight: 800;
  color: var(--s-amber);
}
.quiz-count { color: var(--s-ink-dim); font-size: clamp(18px, 2.2vw, 26px); margin-top: 10px; }
.celebrate {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(20, 12, 44, 0.72);
  font-size: clamp(60px, 10vw, 130px);
  animation: pop-in 0.5s ease;
}
.celebrate .cap { font-size: clamp(28px, 4vw, 52px); color: var(--s-amber); font-weight: 800; margin-top: 12px; }
.celebrate[hidden] { display: none; }
@keyframes pop-in {
  0% { transform: scale(0.5); opacity: 0; }
  70% { transform: scale(1.08); opacity: 1; }
  100% { transform: scale(1); }
}

/* ---- 结尾三行总结 ---- */
.summary-lines { margin-top: 10px; }
.summary-lines p { margin: 14px 0; }

/* 返回主页小链接 */
.back-home {
  position: fixed;
  top: 16px;
  left: 20px;
  z-index: 20;
  color: var(--s-ink-dim);
  font-size: 16px;
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
}
.back-home:hover { color: var(--s-ink); text-decoration: none; background: rgba(255, 255, 255, 0.16); }

@media (max-width: 640px) {
  .slide { padding: 60px 5vw 120px; }
  .slide .lm-kbd { height: 170px; }
  .huge-btn { padding: 16px 26px; }
  .lm-nav-btn { width: 56px; height: 56px; }
}