.audio-cover-shell {
  position: relative;
  overflow: hidden;
  margin: 22px 0 14px;
  padding: 25px 22px 20px;
  border: 1px solid rgba(255, 255, 255, .7);
  border-radius: var(--radius-card, 24px);
  background:
    radial-gradient(circle at 82% 12%, rgba(234, 214, 168, .64), transparent 34%),
    linear-gradient(145deg, rgba(222, 239, 241, .9), rgba(251, 247, 237, .86));
  box-shadow: var(--shadow-soft, 0 12px 40px rgba(29, 79, 75, .08));
  color: var(--color-ink, #174f4c);
}

.audio-cover-shell::before,
.audio-cover-shell::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(47, 129, 121, .13);
  border-radius: 50%;
}

.audio-cover-shell::before { width: 190px; height: 190px; right: -70px; top: -95px; }
.audio-cover-shell::after { width: 130px; height: 130px; right: -42px; top: -64px; }

.audio-cover-kicker,
.audio-cover-title { position: relative; z-index: 1; display: block; }
.audio-cover-kicker { margin-bottom: 6px; color: rgba(23, 79, 76, .62); font-size: 12px; letter-spacing: .14em; }
.audio-cover-title { max-width: 85%; font-family: "Songti SC", STSong, serif; font-size: 18px; line-height: 1.55; }

.brand-audio-player { position: relative; z-index: 1; margin-top: 22px; }
.audio-engine { position: absolute; width: 1px; height: 1px; opacity: .001; pointer-events: none; }
.audio-controls { display: grid; grid-template-columns: 54px minmax(0, 1fr); gap: 13px; align-items: center; }
.audio-play {
  width: 54px;
  height: 54px;
  border: 1px solid rgba(234, 214, 168, .8);
  border-radius: 50%;
  background: linear-gradient(145deg, #236e68, #3d9188);
  box-shadow: 0 9px 22px rgba(23, 79, 76, .2), inset 0 1px rgba(255,255,255,.28);
  color: white;
  font-size: 19px;
  cursor: pointer;
}
.audio-play.is-playing { background: linear-gradient(145deg, #174f4c, #2f8179); }
.audio-timeline { min-width: 0; }
.audio-progress {
  width: 100%;
  height: 5px;
  margin: 0;
  border-radius: 999px;
  outline: none;
  appearance: none;
  background: linear-gradient(to right, var(--color-gold, #c99a4a) var(--audio-progress, 0%), rgba(23,79,76,.16) var(--audio-progress, 0%));
  cursor: pointer;
}
.audio-progress::-webkit-slider-thumb { appearance: none; width: 17px; height: 17px; border: 3px solid #fbf7ed; border-radius: 50%; background: #c99a4a; box-shadow: 0 2px 8px rgba(23,79,76,.24); }
.audio-progress::-moz-range-thumb { width: 12px; height: 12px; border: 3px solid #fbf7ed; border-radius: 50%; background: #c99a4a; }
.audio-meta { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 8px; color: rgba(23,79,76,.62); font-size: 12px; }
.audio-replay { border: 0; padding: 3px 0; background: transparent; color: #2f8179; font: inherit; cursor: pointer; }
.audio-status { min-height: 20px; margin: 10px 0 0; color: rgba(23,79,76,.68); font-size: 13px; }
.audio-status.is-error { color: #9a5b46; }
.audio-retry { margin-left: 8px; border: 0; border-bottom: 1px solid currentColor; background: none; color: inherit; font: inherit; cursor: pointer; }
.audio-fallback { margin: 10px 0 0; color: rgba(23,79,76,.72); font-size: 13px; line-height: 1.7; }
.transcript-toggle { display: block; margin: 13px auto 0; border: 0; border-bottom: 1px solid rgba(47,129,121,.35); background: transparent; color: #2f8179; font-size: 14px; cursor: pointer; }
.lesson-transcript { margin-top: 15px; padding: 16px 4px 2px; border-top: 1px solid rgba(47,129,121,.15); color: rgba(23,79,76,.78); font-size: 14px; line-height: 1.85; }
.lesson-transcript p { margin: 0 0 10px; }

@media (max-width: 420px) {
  .audio-cover-shell { padding: 22px 18px 18px; }
  .audio-controls { grid-template-columns: 50px minmax(0, 1fr); gap: 11px; }
  .audio-play { width: 50px; height: 50px; }
}