/**
 * Holodepth — demo ses şeridi (kaset / holo band estetiği)
 * primitive-geometriler ve ileride diğer topic sayfaları
 *
 * .demo-audio-band: demo figure’dan ayrı; genişlik ana okuma kutusu (.doc-panel) ile aynı — viewport’a taşmaz.
 */

.demo-audio-band {
  width: 100%;
  max-width: 100%;
  margin-top: clamp(0.85rem, 2.2vw, 1.25rem);
  margin-bottom: 0.65rem;
  box-sizing: border-box;
}

.demo-audio-band .demo-audio-rail {
  width: 100%;
  max-width: none;
  margin: 0;
  border-radius: 14px;
  border: 1px solid rgba(94, 200, 255, 0.24);
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.4) inset,
    0 10px 36px rgba(0, 0, 0, 0.38),
    0 0 28px rgba(46, 231, 242, 0.1);
}

.demo-audio-rail {
  --rail-accent-a: #2ee7f2;
  --rail-accent-b: #b56cff;
  --rail-bg0: rgba(8, 10, 20, 0.92);
  --rail-bg1: rgba(14, 18, 32, 0.88);
  position: relative;
  margin: 0;
  padding: 0.55rem 0.75rem 0.6rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  background: linear-gradient(105deg, var(--rail-bg0), var(--rail-bg1));
  overflow: hidden;
}

.demo-audio-rail::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 80% at 10% 0%, rgba(46, 231, 242, 0.12), transparent 55%),
    radial-gradient(90% 70% at 92% 100%, rgba(181, 108, 255, 0.1), transparent 50%);
  pointer-events: none;
}

.demo-audio-rail__scan {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--rail-accent-a), var(--rail-accent-b), transparent);
  opacity: 0.35;
  transform: translateX(-30%);
  pointer-events: none;
}

.demo-audio-rail.is-playing .demo-audio-rail__scan {
  animation: demo-audio-scan 2.8s ease-in-out infinite;
  opacity: 0.85;
}

@keyframes demo-audio-scan {
  0% {
    transform: translateX(-40%);
  }
  50% {
    transform: translateX(20%);
  }
  100% {
    transform: translateX(80%);
  }
}

.demo-audio-rail__note {
  position: relative;
  z-index: 1;
  margin: 0 0 0.45rem;
  padding-left: 0.35rem;
  border-left: 2px solid rgba(46, 231, 242, 0.45);
  font-size: 0.62rem;
  line-height: 1.45;
  letter-spacing: 0.02em;
  color: rgba(170, 198, 230, 0.88);
  font-style: italic;
}

.demo-audio-rail__body {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem 0.75rem;
}

.demo-audio-rail__cassette {
  display: flex;
  align-items: center;
  gap: 0.28rem;
  padding: 0.2rem 0.45rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(0, 0, 0, 0.35);
  box-shadow: 0 0 0 1px rgba(46, 231, 242, 0.08) inset;
}

.demo-audio-rail__reel {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #2a3548, #0c0e16);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.demo-audio-rail.is-playing .demo-audio-rail__reel {
  animation: demo-audio-reel 0.9s linear infinite;
}

@keyframes demo-audio-reel {
  to {
    transform: rotate(360deg);
  }
}

.demo-audio-rail__waves {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 22px;
  padding: 0 0.15rem;
}

.demo-audio-rail__bar {
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--rail-accent-a), var(--rail-accent-b));
  opacity: 0.35;
  transform: scaleY(0.35);
  transform-origin: bottom;
}

.demo-audio-rail.is-playing .demo-audio-rail__bar {
  opacity: 0.95;
  animation: demo-audio-bar 0.85s ease-in-out infinite alternate;
}

.demo-audio-rail__bar:nth-child(1) {
  animation-delay: 0s;
}
.demo-audio-rail__bar:nth-child(2) {
  animation-delay: 0.08s;
}
.demo-audio-rail__bar:nth-child(3) {
  animation-delay: 0.16s;
}
.demo-audio-rail__bar:nth-child(4) {
  animation-delay: 0.24s;
}
.demo-audio-rail__bar:nth-child(5) {
  animation-delay: 0.32s;
}

@keyframes demo-audio-bar {
  0% {
    transform: scaleY(0.25);
  }
  100% {
    transform: scaleY(1);
  }
}

.demo-audio-rail__controls {
  display: flex;
  flex: 1 1 10rem;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.65rem;
  min-width: 0;
}

.demo-audio-rail__play-stack {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 0.42rem;
}

.demo-audio-rail__side-meter {
  width: 4px;
  height: 1.5rem;
  flex-shrink: 0;
  border-radius: 999px;
  background: linear-gradient(180deg, #8aefff 0%, #4ecfff 50%, #a78dff 100%);
  opacity: 0.65;
  transition: opacity 0.2s ease;
}

.demo-audio-rail.is-playing .demo-audio-rail__side-meter {
  opacity: 0.95;
}

.demo-audio-rail__play {
  flex-shrink: 0;
  display: inline-grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  padding: 0;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  color: #0a0c12;
  background: linear-gradient(165deg, #c4f7ff 0%, #6ed8f0 45%, #4aa8e8 100%);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.32) inset;
  transition: transform 0.16s ease, filter 0.16s ease;
}

.demo-audio-rail__play:hover {
  transform: scale(1.04);
  filter: brightness(1.05);
}

.demo-audio-rail__play:active {
  transform: scale(0.96);
}

.demo-audio-rail__play:focus-visible {
  outline: 2px solid rgba(46, 231, 242, 0.9);
  outline-offset: 2px;
}

.demo-audio-rail__play[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  filter: grayscale(0.4);
  box-shadow: none;
}

.demo-audio-rail__play-icon {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.demo-audio-rail__play-triangle {
  display: block;
  width: 0;
  height: 0;
  margin-left: 3px;
  border-style: solid;
  border-width: 7px 0 7px 11px;
  border-color: transparent transparent transparent currentColor;
}

.demo-audio-rail.is-playing .demo-audio-rail__play-triangle {
  display: none;
}

.demo-audio-rail__pause-bars {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 4px;
  height: 14px;
}

.demo-audio-rail.is-playing .demo-audio-rail__pause-bars {
  display: flex;
}

/** Klasik duraklat: iki düz çubuk — ekstra çizgi / gölge / gradyan yok */
.demo-audio-rail__pause-bar {
  width: 3px;
  height: 11px;
  border-radius: 0;
  background: currentColor;
}

.demo-audio-rail__meta {
  display: flex;
  flex-direction: column;
  gap: 0.12rem;
  min-width: 0;
  flex: 0 1 11rem;
}

.demo-audio-rail__title {
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(140, 200, 255, 0.82);
}

.demo-audio-rail__status {
  font-size: 0.65rem;
  font-variant-numeric: tabular-nums;
  color: rgba(200, 215, 240, 0.78);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.demo-audio-rail__scrub {
  flex: 1 1 7rem;
  width: auto;
  min-width: 4rem;
  max-width: 22rem;
  height: 4px;
  margin: 0;
  border-radius: 999px;
  accent-color: #5ec8ff;
  cursor: pointer;
  opacity: 0.85;
}

.demo-audio-rail__scrub[disabled] {
  opacity: 0.35;
  cursor: not-allowed;
}

.demo-audio-rail__volume {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 0.35rem;
}

.demo-audio-rail__vol-label {
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(150, 175, 210, 0.75);
  white-space: nowrap;
}

.demo-audio-rail__vol {
  width: 4.5rem;
  height: 4px;
  margin: 0;
  border-radius: 999px;
  accent-color: #5ec8ff;
  cursor: pointer;
}

.demo-audio-rail__vol[disabled] {
  opacity: 0.35;
  cursor: not-allowed;
}

.demo-audio-rail.is-error .demo-audio-rail__note {
  border-left-color: rgba(255, 140, 120, 0.55);
  color: rgba(255, 190, 170, 0.85);
}