:root {
  color-scheme: dark;
  --bg: #071014;
  --panel: rgba(8, 17, 21, 0.74);
  --panel-strong: rgba(12, 25, 30, 0.9);
  --line: rgba(216, 239, 238, 0.16);
  --text: #eef8f5;
  --muted: #99aaa8;
  --accent: #51f2d5;
  --accent-2: #ffcf5a;
  --danger: #ff6b8a;
  --shadow: 0 18px 70px rgba(0, 0, 0, 0.32);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100%;
  min-height: 100dvh;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

body.controls-hidden {
  overflow: hidden;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

#stage {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  display: block;
  background: radial-gradient(circle at 50% 42%, #0a2228 0%, #061014 48%, #020609 100%);
}

.shell {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-content: end;
  grid-template-columns: minmax(320px, 420px) minmax(280px, 360px);
  gap: 14px;
  padding: 22px;
  pointer-events: none;
  transition:
    opacity 240ms ease,
    transform 240ms ease,
    filter 240ms ease;
}

body.controls-hidden .shell {
  opacity: 0;
  transform: translateY(22px) scale(0.985);
  filter: blur(8px);
  pointer-events: none;
}

.panel {
  pointer-events: auto;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(24px) saturate(140%);
  border-radius: 8px;
}

.controls-toggle {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 4;
  min-width: 116px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid rgba(216, 239, 238, 0.22);
  border-radius: 8px;
  color: var(--text);
  background: rgba(8, 17, 21, 0.62);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(140%);
  transition:
    transform 160ms ease,
    background 160ms ease,
    border-color 160ms ease,
    opacity 160ms ease;
}

.controls-toggle:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.36);
  background: rgba(12, 25, 30, 0.82);
}

body:not(.controls-hidden) .controls-toggle {
  opacity: 0.86;
}

body.controls-hidden .controls-toggle {
  min-width: 92px;
  background: rgba(8, 17, 21, 0.5);
}

.immersive-controls {
  position: fixed;
  left: 50%;
  bottom: calc(18px + env(safe-area-inset-bottom, 0px));
  z-index: 4;
  display: flex;
  gap: 10px;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 14px);
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

body.controls-hidden .immersive-controls {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

.immersive-button {
  min-width: 82px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid rgba(216, 239, 238, 0.22);
  border-radius: 8px;
  padding: 0 16px;
  color: var(--text);
  background: rgba(8, 17, 21, 0.58);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(140%);
  text-decoration: none;
  user-select: none;
}

.immersive-button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.control-panel {
  padding: 18px;
}

.settings-panel {
  align-self: end;
  padding: 18px;
}

.brand,
.section-head,
.track-row,
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 11px;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  line-height: 1.08;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(24px, 3vw, 34px);
}

h2 {
  font-size: 18px;
}

.icon-button,
.ghost-button,
.primary-button {
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    background 160ms ease;
}

.icon-button {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  font-size: 19px;
  flex: 0 0 auto;
}

.ghost-button {
  min-height: 36px;
  padding: 0 13px;
}

.primary-button {
  min-width: 112px;
  min-height: 48px;
  padding: 0 18px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #061014;
  border-color: transparent;
  font-weight: 800;
}

.primary-button:disabled {
  cursor: not-allowed;
  filter: grayscale(0.8);
  opacity: 0.55;
}

.icon-button:hover,
.ghost-button:hover,
.primary-button:not(:disabled):hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.35);
}

.drop-zone {
  min-height: 150px;
  margin: 18px 0 16px;
  border: 1px dashed rgba(216, 239, 238, 0.28);
  border-radius: 8px;
  display: grid;
  place-items: center;
  padding: 20px;
  text-align: center;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02)),
    rgba(255, 255, 255, 0.03);
  transition:
    border-color 160ms ease,
    background 160ms ease;
}

.drop-zone.is-dragging {
  border-color: var(--accent);
  background: rgba(81, 242, 213, 0.12);
}

.drop-zone input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.drop-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line);
  color: var(--accent-2);
  font-size: 26px;
  background: rgba(0, 0, 0, 0.18);
}

.drop-title {
  margin-top: 10px;
  font-weight: 800;
  font-size: 17px;
}

.drop-copy,
.track-meta span,
.field label,
.slider-field label,
.meter span {
  color: var(--muted);
  font-size: 12px;
}

.track-meta {
  min-width: 0;
  flex: 1;
}

.track-meta strong,
.track-meta span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.track-meta strong {
  font-size: 14px;
  margin-bottom: 5px;
}

.seek {
  width: 100%;
  margin: 16px 0;
  accent-color: var(--accent);
}

.meter-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 9px;
}

.meter {
  min-width: 0;
  padding: 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.16);
}

.meter span {
  display: block;
  margin-bottom: 8px;
}

.meter i {
  display: block;
  width: 100%;
  height: 38px;
  border-radius: 6px;
  transform-origin: bottom;
  transform: scaleY(0.08);
  background: linear-gradient(180deg, var(--accent-2), var(--accent));
  box-shadow: 0 0 22px rgba(81, 242, 213, 0.22);
}

.section-head {
  margin-bottom: 15px;
}

.field,
.slider-field {
  margin-top: 14px;
}

.field label,
.slider-field label {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 7px;
}

.field input,
.field select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  color: var(--text);
  background: var(--panel-strong);
  outline: none;
}

.field input:focus,
.field select:focus {
  border-color: rgba(81, 242, 213, 0.6);
}

.slider-field input {
  width: 100%;
  accent-color: var(--accent-2);
}

.toggle-row {
  margin-top: 17px;
}

.toggle-row label {
  width: 100%;
  min-height: 42px;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-size: 13px;
}

.toggle-row input {
  accent-color: var(--accent);
}

@media (max-width: 860px) {
  .shell {
    grid-template-columns: 1fr;
    align-content: end;
    padding: 12px;
  }

  .settings-panel {
    align-self: auto;
  }
}

@media (max-width: 520px) {
  .controls-toggle {
    top: 10px;
    right: 10px;
    min-width: 44px;
    width: 44px;
    padding: 0;
  }

  .controls-toggle span:last-child {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }

  .shell {
    padding: 8px;
  }

  .immersive-controls {
    width: calc(100vw - 20px);
    justify-content: center;
    bottom: calc(12px + env(safe-area-inset-bottom, 0px));
  }

  .immersive-button {
    flex: 1;
    max-width: 156px;
  }

  .control-panel,
  .settings-panel {
    padding: 13px;
  }

  .drop-zone {
    min-height: 126px;
    margin-top: 14px;
  }

  .track-row,
  .toggle-row {
    align-items: stretch;
    flex-direction: column;
  }

  .primary-button {
    width: 100%;
  }

  .meter-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}