:root {
  --bg-0: #060d09;
  --bg-1: #0b1a12;
  --card-border: rgba(255,255,255,.09);
  --green: #26a269;
  --green-bright: #33d17a;
  --green-deep: #0c6c3e;
  --gold: #fadb24;
  --ink: #f2f7f3;
  --muted: rgba(242,247,243,.55);
  --faint: rgba(242,247,243,.35);
  --mono: 'JetBrains Mono', monospace;
  --serif: 'Playfair Display', serif;
  --sans: 'Inter', system-ui, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
html { -webkit-tap-highlight-color: transparent; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(900px 520px at 85% -10%, rgba(38,162,105,.16), transparent 60%),
    radial-gradient(720px 440px at -10% 110%, rgba(250,219,36,.05), transparent 55%),
    linear-gradient(160deg, var(--bg-1), var(--bg-0));
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}
#audioEl { display: none; }

.stage {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: clamp(18px, 3vw, 32px) clamp(18px, 4vw, 48px);
}

/* ─── TOPBAR ─── */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.institution-logo {
  width: clamp(118px, 14vw, 164px);
  height: auto;
  display: block;
}
.topbar-label {
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--card-border);
  padding: 8px 14px;
  white-space: nowrap;
}

/* ─── PLAYER CARD ─── */
.player-card {
  position: relative;
  margin: auto;
  width: min(880px, 100%);
  background: linear-gradient(150deg, rgba(255,255,255,.055), rgba(255,255,255,.018));
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: clamp(26px, 4.5vw, 52px);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0,0,0,.45);
}
.card-glow {
  position: absolute;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(38,162,105,.20), transparent 65%);
  top: -180px;
  right: -130px;
  filter: blur(8px);
  pointer-events: none;
}

/* ─── EPISODE ─── */
.episode {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: clamp(20px, 3.5vw, 36px);
  margin-bottom: clamp(26px, 4vw, 42px);
}
.mic-badge {
  position: relative;
  width: clamp(92px, 13vw, 124px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 25%, #2fbf7a, var(--green-deep));
  display: grid;
  place-items: center;
  box-shadow: 0 14px 40px rgba(38,162,105,.35);
  flex-shrink: 0;
}
.mic-badge svg { width: 46%; fill: #ffffff; }
.mic-badge .ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(51,209,122,.55);
  opacity: 0;
  pointer-events: none;
}
.is-playing .ring-1 { animation: pulse 2.2s ease-out infinite; }
.is-playing .ring-2 { animation: pulse 2.2s ease-out .7s infinite; }
@keyframes pulse {
  0% { opacity: .65; transform: scale(1); }
  100% { opacity: 0; transform: scale(1.55); }
}
.episode-meta { min-width: 0; }
.episode-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: .64rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 10px;
}
.episode-title {
  font: 800 clamp(1.5rem, 3.6vw, 2.5rem)/1.1 var(--serif);
  letter-spacing: -.02em;
}
.episode-course {
  color: var(--muted);
  font-size: .85rem;
  margin-top: 9px;
}

/* ─── WAVEFORM ─── */
.console { position: relative; z-index: 1; }
.wave-wrap {
  position: relative;
  height: clamp(72px, 11vw, 96px);
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}
.wave-wrap canvas { width: 100%; height: 100%; display: block; }
.wave-scrub {
  position: absolute;
  top: 6%;
  bottom: 6%;
  width: 2px;
  background: var(--gold);
  box-shadow: 0 0 10px rgba(250,219,36,.8);
  pointer-events: none;
  opacity: 0;
  transition: opacity .15s;
}
.wave-wrap:hover .wave-scrub,
.wave-wrap.scrubbing .wave-scrub { opacity: 1; }
.times {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: .76rem;
  color: var(--muted);
  margin-top: 10px;
}

/* ─── CONTROLS ─── */
.controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(16px, 3.5vw, 30px);
  margin-top: clamp(18px, 3vw, 28px);
}
.skip-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--card-border);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: border-color .2s, color .2s, transform .12s;
  flex-shrink: 0;
}
.skip-btn:hover { border-color: var(--green-bright); color: var(--green-bright); }
.skip-btn:active { transform: scale(.93); }
.skip-btn svg { width: 26px; height: 26px; }
.play-btn {
  position: relative;
  width: clamp(72px, 10vw, 88px);
  aspect-ratio: 1;
  border-radius: 50%;
  border: 0;
  background: linear-gradient(145deg, var(--green-bright), var(--green-deep));
  cursor: pointer;
  display: grid;
  place-items: center;
  box-shadow: 0 12px 34px rgba(38,162,105,.45);
  transition: transform .15s, box-shadow .2s;
  flex-shrink: 0;
}
.play-btn:hover { transform: scale(1.05); box-shadow: 0 16px 46px rgba(38,162,105,.6); }
.play-btn:active { transform: scale(.95); }
.play-btn:focus-visible, .skip-btn:focus-visible, .speed-btn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}
.play-btn .ring-svg {
  position: absolute;
  inset: -11px;
  width: calc(100% + 22px);
  height: calc(100% + 22px);
  transform: rotate(-90deg);
  pointer-events: none;
}
.ring-track { fill: none; stroke: rgba(255,255,255,.14); stroke-width: 3; }
.ring-fill {
  fill: none;
  stroke: var(--gold);
  stroke-width: 3;
  stroke-linecap: round;
  transition: stroke-dashoffset .2s linear;
}
.play-btn .icon { width: 34%; fill: #ffffff; }
.play-btn .icon-pause { display: none; }
.play-btn.playing .icon-play { display: none; }
.play-btn.playing .icon-pause { display: block; }
.speed-btn {
  font-family: var(--mono);
  font-size: .78rem;
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--ink);
  border-radius: 999px;
  padding: 12px 16px;
  cursor: pointer;
  transition: border-color .2s, color .2s;
  flex-shrink: 0;
}
.speed-btn:hover { border-color: var(--green-bright); color: var(--green-bright); }
.status {
  margin-top: 18px;
  text-align: center;
  font-size: .8rem;
  color: #ffd9d9;
}
.status[hidden] { display: none; }

/* ─── HINT ─── */
.hint {
  text-align: center;
  font-family: var(--mono);
  font-size: .6rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--faint);
  padding: 20px 0 4px;
}

/* ─── RESPONSIVE ─── */
@media (max-width: 560px) {
  .skip-btn { width: 46px; height: 46px; }
  .skip-btn svg { width: 22px; height: 22px; }
  .controls { gap: 14px; }
  .episode { align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) {
  .is-playing .ring-1, .is-playing .ring-2 { animation: none; }
  .play-btn, .skip-btn { transition: none; }
}