body.page-bgm {
  --site-header-height: 68px;
  --bgm-bg: #0b0d10;
  --bgm-panel: #161b22;
  --bgm-panel-2: #161b22;
  --bgm-stroke: #2c3139;
  --bgm-stroke-strong: #3a414b;
  --bgm-ink: #dfe7ef;
  --bgm-muted: rgba(223, 231, 239, 0.55);
  --bgm-accent: #23e7f2;
  --bgm-accent-strong: #0bb8c5;
  --bgm-glow: 0 0 12px rgba(35, 231, 242, 0.35);
  --bgm-stop-accent: #ff2f7a;
  --bgm-stop-accent-soft: rgba(255, 47, 122, 0.35);
  --bgm-genre-accent: #b44bff;
  --bgm-genre-accent-strong: #8b2be3;
  --bgm-genre-accent-soft: rgba(180, 75, 255, 0.35);
  --bgm-ambience-accent: #f7c62f;
  --bgm-ambience-accent-soft: rgba(247, 198, 47, 0.35);
  --bgm-side-header-size: 0.8rem;
  --bgm-side-header-spacing: 0.26em;
  --bgm-side-header-icon: 24px;
  --bgm-side-header-gap: 12px;
  --bgm-center-width: 1200px;
  --bgm-side-width: 288px;
  --bgm-layout-gap: 18px;
  --bgm-music-panel-viewport-gap: 28px;
  --bgm-timer-digit-size: 2.0rem;
  --bgm-timer-wheel-item: 50px;
  --bgm-timer-wheel-max-width: 170px;
  --bgm-genre-row-height: 50px;
  --bgm-genre-row-gap: 10px;
  --bgm-genre-visible-full-rows: 6;
  --bgm-genre-visible-gaps: 5;
  background:
    radial-gradient(120% 160% at 10% -20%, rgba(35, 231, 242, 0.08), transparent 55%),
    radial-gradient(120% 180% at 110% 10%, rgba(35, 231, 242, 0.06), transparent 65%),
    var(--bgm-bg);
  color: var(--bgm-ink);
  min-height: 100vh;
}

body.page-bgm .brand-icon {
  color: var(--bgm-accent);
}

body.page-bgm .brand-copy {
  position: relative;
  display: inline-flex;
  align-items: center;
  line-height: 1;
}

body.page-bgm .brand-copy > .brand {
  align-items: center;
}

body.page-bgm .brand-name {
  line-height: 1;
}

body.page-bgm .brand-subtitle {
  position: absolute;
  left: 40px;
  top: 28px;
  font-family: "Orbitron", "Rajdhani", sans-serif;
  font-size: 0.66rem;
  font-weight: 400;
  letter-spacing: 0.30em;
  text-transform: uppercase;
  line-height: 1;
  color: #38ebff;
  text-shadow:
    0 0 8px rgba(56, 235, 255, 0.72),
    0 0 22px rgba(56, 235, 255, 0.38);
  pointer-events: none;
  user-select: none;
}

body.page-bgm .bgm-site-header .bgm-header-inner {
  max-width: var(--bgm-center-width);
}

body.page-bgm .bgm-site-header {
  position: relative;
  z-index: 30;
}

body.page-bgm .bgm-site-header .tools-menu {
  z-index: 31;
}

body.page-bgm .bgm-site-header .tools-dropdown {
  z-index: 32;
  background: #000;
  border-color: rgba(148, 163, 184, 0.28);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.58);
}

body.page-bgm .bgm-site-header .tools-item {
  color: rgba(233, 233, 233, 0.94);
}

body.page-bgm .bgm-site-header .tools-item:hover,
body.page-bgm .bgm-site-header .tools-item:focus-visible {
  background: rgba(255, 255, 255, 0.12);
}

body.page-bgm .bgm-site-header .tools-item[aria-current="page"] {
  background: rgba(255, 255, 255, 0.18);
}

body.page-bgm .bgm-site-header .tools-menu>summary .material-symbols-outlined {
  color: #fff;
}

.bgm-stage {
  min-height: calc(100vh - var(--site-header-height));
  min-height: calc(100svh - var(--site-header-height));
  min-height: calc(100dvh - var(--site-header-height));
  display: grid;
  justify-items: center;
  align-content: start;
  /* padding: 6px 0 0; */
}

body.page-bgm .site-footer {
  margin-top: 0;
  background: transparent;
  border-top: none;
}

body.page-bgm .site-footer,
body.page-bgm .site-footer .footer-inner,
body.page-bgm .site-footer .footer-legal,
body.page-bgm .site-footer .footer-legal a,
body.page-bgm .site-footer .copyright,
body.page-bgm .site-footer .footer-tools a {
  color: #fff !important;
}

body.page-bgm .site-footer .footer-legal a+a::before {
  color: rgba(255, 255, 255, 0.55) !important;
}

.bgm-layout {
  width: 100%;
  max-width: var(--bgm-center-width);
  display: grid;
  grid-template-columns: var(--bgm-side-width) minmax(0, 1fr) var(--bgm-side-width);
  gap: var(--bgm-layout-gap);
  align-items: start;
}

.bgm-side {
  width: 100%;
  display: grid;
  align-content: start;
  min-width: 0;
}

.bgm-side-left {
  justify-self: end;
}

.bgm-side-right {
  justify-self: start;
}

.bgm-panel {
  width: 100%;
  max-width: var(--bgm-center-width);
  min-width: 0;
  background: var(--bgm-panel);
  border: 1px solid var(--bgm-stroke);
  border-radius: 18px;
  box-shadow:
    0 18px 40px rgba(0, 0, 0, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  padding: 22px 26px 28px;
  position: relative;
  overflow: hidden;
}

.bgm-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: none;
  opacity: 0;
  pointer-events: none;
}

.bgm-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 6px 4px;
  border-bottom: 1px solid var(--bgm-stroke-strong);
}

.bgm-title {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.85rem;
  font-weight: 700;
}

.bgm-title-icon {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--bgm-accent);
  box-shadow: var(--bgm-glow);
  position: relative;
}

.bgm-title-icon::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: var(--bgm-accent);
  box-shadow: var(--bgm-glow);
}

.bgm-title span {
  color: var(--bgm-ink);
}

.bgm-title small {
  color: var(--bgm-accent);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  margin-left: 8px;
}

.bgm-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: var(--bgm-side-header-spacing);
  color: rgba(214, 225, 241, 0.9);
  text-transform: uppercase;
}

.bgm-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(35, 231, 242, 0.55);
  box-shadow: 0 0 10px rgba(35, 231, 242, 0.45);
}

.bgm-panel.is-running .bgm-status-dot {
  background: var(--bgm-accent-strong);
  box-shadow: 0 0 12px rgba(11, 184, 197, 0.8);
}

.bgm-panel-body {
  padding: 20px 4px 0;
  display: grid;
  gap: 28px;
}

.bgm-time-group {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  background: var(--bgm-panel-2);
  border: none;
  border-radius: 14px;
  padding: 0;
  box-shadow: none;
}

.bgm-time-group.is-running {
  pointer-events: none;
}

.bgm-time-card {
  display: grid;
  gap: 10px;
  justify-items: center;
}

.bgm-time-label {
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(214, 225, 241, 0.9);
  text-align: center;
}

.bgm-wheel {
  --wheel-item: var(--bgm-timer-wheel-item);
  --wheel-visible: 5;
  position: relative;
  width: 100%;
  max-width: var(--bgm-timer-wheel-max-width);
  border-radius: 12px;
  border: 1px solid var(--bgm-stroke-strong);
  background: #0b0e12;
  box-shadow:
    inset 0 0 22px rgba(0, 0, 0, 0.7),
    0 12px 26px rgba(0, 0, 0, 0.45);
  overflow: hidden;
}

.bgm-wheel::before,
.bgm-wheel::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: calc(var(--wheel-item) * 1.4);
  pointer-events: none;
  z-index: 2;
}

.bgm-wheel::before {
  top: 0;
  background: linear-gradient(180deg, rgba(11, 14, 18, 0.95), rgba(11, 14, 18, 0));
}

.bgm-wheel::after {
  bottom: 0;
  background: linear-gradient(0deg, rgba(11, 14, 18, 0.95), rgba(11, 14, 18, 0));
}

.bgm-wheel-track {
  height: calc(var(--wheel-item) * var(--wheel-visible));
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  padding-block: calc((var(--wheel-visible) - 1) * var(--wheel-item) / 2);
  scrollbar-width: none;
  display: grid;
  align-content: start;
  position: relative;
  z-index: 1;
  overscroll-behavior: contain;
}

.bgm-wheel-track::-webkit-scrollbar {
  width: 0;
  height: 0;
}

.bgm-wheel-item {
  height: var(--wheel-item);
  display: grid;
  place-items: center;
  scroll-snap-align: center;
  scroll-snap-stop: always;
  font-family: "Orbitron", "Rajdhani", "Segoe UI", sans-serif;
  letter-spacing: 0.18em;
  font-size: var(--bgm-timer-digit-size);
  color: rgba(132, 149, 171, 0.42);
  opacity: 0.34;
  transform: scale(0.78);
  transition: color 180ms ease, opacity 180ms ease, transform 180ms ease, text-shadow 180ms ease;
  text-shadow: none;
}

.bgm-wheel-item.is-mid {
  color: rgba(132, 149, 171, 0.58);
  opacity: 0.48;
  transform: scale(0.94);
}

.bgm-wheel-item.is-near {
  color: rgba(158, 177, 201, 0.76);
  opacity: 0.58;
  transform: scale(1);
}

.bgm-wheel-item.is-active {
  color: var(--bgm-accent);
  opacity: 1;
  text-shadow: 0 0 14px rgba(35, 231, 242, 0.42);
  transform: scale(1.08);
}

.bgm-wheel-static {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  height: var(--wheel-item);
  display: grid;
  place-items: center;
  font-family: "Orbitron", "Rajdhani", "Segoe UI", sans-serif;
  letter-spacing: 0.18em;
  font-size: var(--bgm-timer-digit-size);
  color: var(--bgm-accent);
  text-shadow: 0 0 16px rgba(35, 231, 242, 0.35);
  opacity: 0;
  pointer-events: none;
  z-index: 4;
}

.bgm-wheel.is-static .bgm-wheel-item {
  opacity: 0.25;
  color: rgba(132, 149, 171, 0.55);
  text-shadow: none;
  transform: none;
}

.bgm-wheel.is-static .bgm-wheel-item.is-active {
  opacity: 0;
}

.bgm-wheel.is-static .bgm-wheel-static {
  transform: translateY(-50%) scale(1.08);
  opacity: 1;
}

.bgm-wheel-highlight {
  position: absolute;
  left: 10px;
  right: 10px;
  top: 50%;
  height: var(--wheel-item);
  transform: translateY(-50%);
  border-radius: 10px;
  border: 1px solid rgba(35, 231, 242, 0.35);
  background: linear-gradient(90deg, rgba(35, 231, 242, 0.12), rgba(35, 231, 242, 0));
  box-shadow:
    inset 0 0 12px rgba(35, 231, 242, 0.15),
    0 0 12px rgba(35, 231, 242, 0.15);
  pointer-events: none;
  z-index: 3;
}

@media (min-width: 601px) {
  .bgm-panel-header {
    border-bottom-color: rgba(35, 231, 242, 0.38);
  }

  .bgm-wheel {
    border-color: rgba(35, 231, 242, 0.38);
    box-shadow:
      inset 0 0 22px rgba(0, 0, 0, 0.7),
      inset 0 0 0 1px rgba(35, 231, 242, 0.12),
      0 12px 26px rgba(0, 0, 0, 0.45);
  }

  .bgm-wheel-highlight {
    border-color: rgba(35, 231, 242, 0.58);
    background: linear-gradient(90deg, rgba(35, 231, 242, 0.16), rgba(35, 231, 242, 0.02));
    box-shadow:
      inset 0 0 14px rgba(35, 231, 242, 0.22),
      0 0 16px rgba(35, 231, 242, 0.22);
  }
}

.bgm-time-box {
  background: #0c0f13;
  border: 1px solid var(--bgm-stroke-strong);
  border-radius: 10px;
  padding: 14px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 16px;
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.04),
    0 10px 24px rgba(0, 0, 0, 0.45);
}

.bgm-time-display {
  background: #05070a;
  border: 1px solid var(--bgm-stroke-strong);
  border-radius: 10px;
  padding: 18px 16px;
  text-align: center;
  font-family: "Orbitron", "Rajdhani", "Segoe UI", sans-serif;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--bgm-accent);
  text-shadow: 0 0 16px rgba(35, 231, 242, 0.35);
  font-size: clamp(26px, 3vw, 40px);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

.bgm-time-fader-wrap {
  width: 62px;
  height: 148px;
  border-radius: 12px;
  border: 1px solid #2e343c;
  background: #0b0d10;
  display: grid;
  place-items: center;
  box-shadow:
    inset 0 0 18px rgba(0, 0, 0, 0.7),
    0 0 0 1px rgba(255, 255, 255, 0.03);
  position: relative;
  padding: 10px 12px;
}

.bgm-time-fader-wrap::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 50%;
  width: 10px;
  transform: translateX(-50%);
  border-radius: 999px;
  background: linear-gradient(180deg, #0b0d10, #000);
  box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.8);
  z-index: 1;
  pointer-events: none;
}

.bgm-time-fader-wrap::after {
  content: "";
  position: absolute;
  right: 8px;
  top: 14px;
  bottom: 14px;
  width: 8px;
  background:
    repeating-linear-gradient(to bottom,
      rgba(255, 255, 255, 0.28),
      rgba(255, 255, 255, 0.28) 2px,
      transparent 2px,
      transparent 18px);
  opacity: 0.35;
  z-index: 1;
  pointer-events: none;
}

.bgm-time-fader {
  -webkit-appearance: none;
  appearance: none;
  writing-mode: vertical-rl;
  width: 44px;
  height: 110px;
  background: transparent;
  outline: none;
  margin: 0;
  padding: 0;
  accent-color: transparent;
  position: relative;
  z-index: 2;
  transform: rotate(180deg);
  transform-origin: center;
  margin-left: -4px;
}

.bgm-time-fader::-webkit-slider-runnable-track {
  width: 100%;
  height: 100%;
  background: transparent;
}

.bgm-time-fader::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 44px;
  height: 23px;
  border-radius: 6px;
  background:
    linear-gradient(180deg,
      transparent 0%,
      transparent calc(50% - 1px),
      #25e6f2 calc(50% - 1px),
      #25e6f2 calc(50% + 1px),
      transparent calc(50% + 1px),
      transparent 100%),
    linear-gradient(180deg, #2b3138 0%, #1d2227 100%);
  background-size: calc(100% - 20px) 100%, 100% 100%;
  background-position: center, center;
  background-repeat: no-repeat;
  border: 1px solid #3a4048;
  box-shadow:
    0 0 12px rgba(35, 231, 242, 0.35),
    inset 0 1px 2px rgba(255, 255, 255, 0.12),
    inset 0 -1px 2px rgba(0, 0, 0, 0.5);
}

.bgm-time-fader::-moz-range-track {
  width: 100%;
  height: 100%;
  background: transparent;
}

.bgm-time-fader::-moz-range-thumb {
  width: 44px;
  height: 23px;
  border-radius: 6px;
  background:
    linear-gradient(180deg,
      transparent 0%,
      transparent calc(50% - 1px),
      #25e6f2 calc(50% - 1px),
      #25e6f2 calc(50% + 1px),
      transparent calc(50% + 1px),
      transparent 100%),
    linear-gradient(180deg, #2b3138 0%, #1d2227 100%);
  background-size: calc(100% - 20px) 100%, 100% 100%;
  background-position: center, center;
  background-repeat: no-repeat;
  border: 1px solid #3a4048;
  box-shadow:
    0 0 12px rgba(35, 231, 242, 0.35),
    inset 0 1px 2px rgba(255, 255, 255, 0.12),
    inset 0 -1px 2px rgba(0, 0, 0, 0.5);
}

.bgm-presets {
  display: grid;
  gap: 12px;
}

.bgm-presets-label {
  font-size: 0.65rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: rgba(132, 149, 171, 0.8);
}

.bgm-presets-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.bgm-preset {
  background: linear-gradient(180deg, #2a2f36, #20242a);
  border: 1px solid #2a2f36;
  color: var(--bgm-muted);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  padding: 12px 8px;
  border-radius: 8px;
  box-shadow: 0 10px 18px rgba(0, 0, 0, 0.45);
  transition: transform 150ms ease, border-color 200ms ease, color 200ms ease;
}

.bgm-preset:hover {
  transform: translateY(-1px);
  border-color: var(--bgm-stroke-strong);
  color: var(--bgm-ink);
}

.bgm-preset.is-active {
  color: var(--bgm-accent);
  border-color: var(--bgm-accent-strong);
  box-shadow:
    0 10px 18px rgba(0, 0, 0, 0.45),
    inset 0 -2px 0 var(--bgm-accent);
}

.bgm-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.bgm-control {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0;
  width: 100%;
  height: 48px;
  border-radius: 6px;
  border: 1px solid transparent;
  border-bottom-width: 3px;
  background: #0d1116;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.36em;
  text-transform: uppercase;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.04),
    0 12px 22px rgba(0, 0, 0, 0.45);
  transition: transform 150ms ease, border-color 200ms ease, color 200ms ease, box-shadow 200ms ease;
}

.bgm-control:hover {
  transform: translateY(-1px);
}

.bgm-control:active {
  transform: translateY(0);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.45);
}

.bgm-control-icon {
  width: 12px;
  height: 12px;
  position: relative;
  display: inline-block;
}

.bgm-control-icon-start::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 1px;
  width: 0;
  height: 0;
  border-left: 10px solid currentColor;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}

.bgm-control-icon-stop::before {
  content: "";
  position: absolute;
  inset: 1px;
  border-radius: 2px;
  background: currentColor;
}

.bgm-control-start {
  border-color: var(--bgm-accent);
  border-bottom-color: var(--bgm-accent);
  color: var(--bgm-accent);
  box-shadow:
    0 0 0 1px rgba(35, 231, 242, 0.35),
    0 12px 22px rgba(0, 0, 0, 0.45);
}

.bgm-control-start:hover {
  box-shadow:
    0 0 14px rgba(35, 231, 242, 0.35),
    0 12px 22px rgba(0, 0, 0, 0.45);
}

.bgm-control-stop {
  border-color: var(--bgm-stop-accent);
  border-bottom-color: var(--bgm-stop-accent);
  color: var(--bgm-stop-accent);
  box-shadow:
    0 0 0 1px rgba(255, 47, 122, 0.35),
    0 12px 22px rgba(0, 0, 0, 0.45);
}

.bgm-control-stop:hover {
  box-shadow:
    0 0 14px var(--bgm-stop-accent-soft),
    0 12px 22px rgba(0, 0, 0, 0.45);
}

.bgm-progress {
  display: grid;
  gap: 10px;
}

.bgm-progress-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  font-weight: 600;
}

.bgm-progress-label {
  color: rgba(35, 231, 242, 0.9);
}

.bgm-progress-percent {
  color: rgba(35, 231, 242, 0.95);
}

.bgm-progress-track {
  position: relative;
  width: 100%;
  height: 12px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(18, 31, 49, 0.92), rgba(24, 39, 61, 0.76));
  overflow: hidden;
  box-shadow:
    inset 0 0 0 1px rgba(35, 231, 242, 0.12),
    inset 0 2px 6px rgba(4, 8, 12, 0.7);
}

.bgm-progress-fill {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #15cfe2 0%, #1ce3f0 66%, #7ff4ff 100%);
  box-shadow:
    0 0 16px rgba(35, 231, 242, 0.52),
    0 0 28px rgba(35, 231, 242, 0.3);
  transition: width 180ms linear;
}

.bgm-progress-end-time {
  margin: 0;
  text-align: center;
  font-family: "Rajdhani", "Segoe UI", sans-serif;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  color: rgba(35, 231, 242, 0.56);
  text-shadow: 0 0 16px rgba(35, 231, 242, 0.24);
}

/* =========================================================
  Genre select (side panel)
========================================================= */
.bgm-genre-panel {
  background: var(--bgm-panel);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  justify-content: center;
  align-items: start;
  grid-auto-rows: max-content;
  gap: 14px;
  position: relative;
  max-height: none;
  overflow: visible;
  padding-top: 0;
  padding-right: 0;
}

@media (min-width: 1001px) {
  .bgm-layout {
    align-items: stretch;
  }

  .bgm-panel {
    min-height: 0;
    height: 100%;
    max-height: calc(100vh - var(--site-header-height) - var(--bgm-music-panel-viewport-gap));
    max-height: calc(100svh - var(--site-header-height) - var(--bgm-music-panel-viewport-gap));
    max-height: calc(100dvh - var(--site-header-height) - var(--bgm-music-panel-viewport-gap));
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
  }

  .bgm-panel-body {
    min-height: 0;
    overflow-y: auto;
    align-content: start;
  }

  .bgm-side-left .bgm-matrix-card {
    min-height: 0;
    max-height: calc(100vh - var(--site-header-height) - var(--bgm-music-panel-viewport-gap));
    max-height: calc(100svh - var(--site-header-height) - var(--bgm-music-panel-viewport-gap));
    max-height: calc(100dvh - var(--site-header-height) - var(--bgm-music-panel-viewport-gap));
    grid-template-rows: auto minmax(0, 1fr);
    overflow: hidden;
  }

  .bgm-side-left .bgm-matrix-collapsible {
    min-height: 0;
    display: grid;
    grid-template-rows: minmax(0, 1fr) auto;
    gap: var(--bgm-side-header-gap);
    overflow: hidden;
  }

  .bgm-side-left .bgm-genre-panel {
    --genre-scrollbar-size: 10px;
    min-height: 0;
    align-content: start;
    overflow-y: auto;
    overflow-x: hidden;
    width: 100%;
    margin-right: 0;
    padding-right: 2px;
    scrollbar-width: thin;
    scrollbar-color: transparent transparent;
    scrollbar-gutter: stable;
    box-sizing: border-box;
  }

  .bgm-side-left .bgm-genre-panel::-webkit-scrollbar {
    width: var(--genre-scrollbar-size);
  }

  .bgm-side-left .bgm-genre-panel::-webkit-scrollbar-track {
    background: transparent;
    border-left: 1px solid transparent;
    border-right: 1px solid transparent;
    border-radius: 2px;
  }

  .bgm-side-left .bgm-genre-panel::-webkit-scrollbar-thumb {
    background: transparent;
    border: 1px solid transparent;
    border-radius: 2px;
    box-shadow: none;
  }

  .bgm-side-left .bgm-matrix-card:hover .bgm-genre-panel,
  .bgm-side-left .bgm-genre-panel:hover,
  .bgm-side-left .bgm-genre-panel:focus-within {
    scrollbar-color: rgba(200, 205, 214, 0.5) rgba(6, 8, 12, 0.92);
  }

  .bgm-side-left .bgm-matrix-card:hover .bgm-genre-panel::-webkit-scrollbar-track,
  .bgm-side-left .bgm-genre-panel:hover::-webkit-scrollbar-track,
  .bgm-side-left .bgm-genre-panel:focus-within::-webkit-scrollbar-track {
    background: linear-gradient(180deg, rgba(3, 5, 8, 0.96), rgba(10, 12, 17, 0.94));
    border-left: 1px solid rgba(255, 255, 255, 0.04);
    border-right: 1px solid rgba(255, 255, 255, 0.02);
  }

  .bgm-side-left .bgm-matrix-card:hover .bgm-genre-panel::-webkit-scrollbar-thumb,
  .bgm-side-left .bgm-genre-panel:hover::-webkit-scrollbar-thumb,
  .bgm-side-left .bgm-genre-panel:focus-within::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, rgba(226, 231, 239, 0.5), rgba(162, 170, 181, 0.52));
    border: 1px solid rgba(245, 248, 252, 0.24);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28);
  }

  .bgm-side-left .bgm-matrix-card:hover .bgm-genre-panel::-webkit-scrollbar-thumb:hover,
  .bgm-side-left .bgm-genre-panel:hover::-webkit-scrollbar-thumb:hover,
  .bgm-side-left .bgm-genre-panel:focus-within::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, rgba(236, 241, 247, 0.62), rgba(175, 184, 196, 0.62));
  }

  .bgm-side-right .bgm-ambience-card {
    min-height: 0;
    max-height: calc(100vh - var(--site-header-height) - var(--bgm-music-panel-viewport-gap));
    max-height: calc(100svh - var(--site-header-height) - var(--bgm-music-panel-viewport-gap));
    max-height: calc(100dvh - var(--site-header-height) - var(--bgm-music-panel-viewport-gap));
    grid-template-rows: auto minmax(0, 1fr);
    overflow: hidden;
  }

  .bgm-side-right .bgm-ambience-collapsible {
    min-height: 0;
    display: grid;
    grid-template-rows: minmax(0, 1fr);
    overflow: hidden;
  }

  .bgm-side-right .bgm-ambience-grid {
    --ambience-scrollbar-size: 10px;
    min-height: 0;
    height: 100%;
    align-content: start;
    overflow-y: auto;
    overflow-x: hidden;
    width: 100%;
    margin-right: 0;
    padding-top: 1px;
    padding-right: 2px;
    scrollbar-width: thin;
    scrollbar-color: transparent transparent;
    scrollbar-gutter: stable;
    box-sizing: border-box;
  }

  .bgm-side-right .bgm-ambience-grid::-webkit-scrollbar {
    width: var(--ambience-scrollbar-size);
  }

  .bgm-side-right .bgm-ambience-grid::-webkit-scrollbar-track {
    background: transparent;
    border-left: 1px solid transparent;
    border-right: 1px solid transparent;
    border-radius: 2px;
  }

  .bgm-side-right .bgm-ambience-grid::-webkit-scrollbar-thumb {
    background: transparent;
    border: 1px solid transparent;
    border-radius: 2px;
    box-shadow: none;
  }

  .bgm-side-right .bgm-ambience-card:hover .bgm-ambience-grid,
  .bgm-side-right .bgm-ambience-grid:hover,
  .bgm-side-right .bgm-ambience-grid:focus-within {
    scrollbar-color: rgba(200, 205, 214, 0.5) rgba(6, 8, 12, 0.92);
  }

  .bgm-side-right .bgm-ambience-card:hover .bgm-ambience-grid::-webkit-scrollbar-track,
  .bgm-side-right .bgm-ambience-grid:hover::-webkit-scrollbar-track,
  .bgm-side-right .bgm-ambience-grid:focus-within::-webkit-scrollbar-track {
    background: linear-gradient(180deg, rgba(3, 5, 8, 0.96), rgba(10, 12, 17, 0.94));
    border-left: 1px solid rgba(255, 255, 255, 0.04);
    border-right: 1px solid rgba(255, 255, 255, 0.02);
  }

  .bgm-side-right .bgm-ambience-card:hover .bgm-ambience-grid::-webkit-scrollbar-thumb,
  .bgm-side-right .bgm-ambience-grid:hover::-webkit-scrollbar-thumb,
  .bgm-side-right .bgm-ambience-grid:focus-within::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, rgba(226, 231, 239, 0.5), rgba(162, 170, 181, 0.52));
    border: 1px solid rgba(245, 248, 252, 0.24);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28);
  }

  .bgm-side-right .bgm-ambience-card:hover .bgm-ambience-grid::-webkit-scrollbar-thumb:hover,
  .bgm-side-right .bgm-ambience-grid:hover::-webkit-scrollbar-thumb:hover,
  .bgm-side-right .bgm-ambience-grid:focus-within::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, rgba(236, 241, 247, 0.62), rgba(175, 184, 196, 0.62));
  }
}

.bgm-genre-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 120% at 15% -10%, rgba(180, 75, 255, 0.22), transparent 60%),
    radial-gradient(120% 100% at 110% 0%, rgba(180, 75, 255, 0.12), transparent 62%);
  opacity: 0;
  pointer-events: none;
}

.bgm-genre-item-wrap {
  position: relative;
  display: block;
  width: 100%;
  min-height: 0;
  align-self: start;
}

.bgm-genre-item {
  --genre-image: none;
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: #0e1217;
  color: var(--bgm-ink);
  padding: 0;
  border-radius: 12px;
  display: block;
  text-align: center;
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  min-height: 0;
  aspect-ratio: 1 / 1;
  box-sizing: border-box;
  overflow: hidden;
  font-family: "Rajdhani", "Segoe UI", sans-serif;
  letter-spacing: 0.08em;
  transition: border-color 200ms ease, box-shadow 200ms ease, transform 200ms ease, color 200ms ease;
}

.bgm-genre-item::before {
  content: none;
}

.bgm-genre-item::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 3px solid transparent;
  pointer-events: none;
  opacity: 0;
  transition: opacity 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}

.bgm-genre-thumb {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(180deg, rgba(7, 9, 12, 0.08), rgba(7, 9, 12, 0.82)),
    var(--genre-image),
    radial-gradient(120% 120% at 15% -8%, rgba(180, 75, 255, 0.42), rgba(12, 16, 22, 0.96) 66%);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  transition: transform 220ms ease;
}

.bgm-genre-item[data-genre="lofi"] {
  --genre-image: url("../images/bgm/genres/lofi.webp");
}

.bgm-genre-item[data-genre="piano"] {
  --genre-image: url("../images/bgm/genres/piano.webp");
}

.bgm-genre-item[data-genre="classical"] {
  --genre-image: url("../images/bgm/genres/classical.webp");
}

.bgm-genre-item[data-genre="neo-classical"] {
  --genre-image: url("../images/bgm/genres/neo-classical.webp");
}

.bgm-genre-item[data-genre="ambient"] {
  --genre-image: url("../images/bgm/genres/ambient.webp");
}

.bgm-genre-item[data-genre="chillwave"] {
  --genre-image: url("../images/bgm/genres/chillwave.webp");
}

.bgm-genre-item[data-genre="bedroom-pop"] {
  --genre-image: url("../images/bgm/genres/bedroom-pop.webp");
}

.bgm-genre-item[data-genre="bossa-nova"] {
  --genre-image: url("../images/bgm/genres/bossa-nova.webp");
}

.bgm-genre-item[data-genre="none"] {
  --genre-image:
    radial-gradient(120% 120% at 20% 0%, rgba(155, 170, 189, 0.38), rgba(12, 16, 22, 0.96) 68%),
    linear-gradient(140deg, rgba(36, 43, 53, 0.95), rgba(9, 12, 17, 0.96));
}

.bgm-genre-item:hover {
  border-color: rgba(255, 255, 255, 0.22);
  transform: none;
}

.bgm-genre-item:hover .bgm-genre-thumb {
  transform: scale(1.04);
}

.bgm-genre-item:focus-visible {
  outline: 2px solid var(--bgm-genre-accent);
  outline-offset: 2px;
}

.bgm-genre-name {
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 8px;
  z-index: 2;
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  line-height: 1.25;
  text-transform: uppercase;
  color: rgba(224, 232, 241, 0.95);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
}

.bgm-genre-item.is-active {
  border-color: transparent;
  box-shadow:
    0 0 18px rgba(180, 75, 255, 0.48);
  transform: none;
}

.bgm-genre-item.is-active::before {
  content: "SELECTED";
  position: absolute;
  top: 7px;
  left: 7px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  z-index: 4;
  min-height: 16px;
  min-width: 68px;
  padding: 2px 8px 0;
  border-radius: 999px;
  border: 1px solid rgba(225, 193, 255, 0.72);
  background: rgba(10, 12, 16, 0.78);
  color: #f2e7ff;
  font-size: 0.5rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  line-height: 1;
  text-align: center;
  text-indent: 0;
}

.bgm-genre-item.is-active::after {
  opacity: 1;
  border-color: rgba(180, 75, 255, 0.95);
  box-shadow: 0 0 14px rgba(180, 75, 255, 0.52);
}

.bgm-genre-item.is-active .bgm-genre-name {
  color: #f5edff;
}

.bgm-genre-preview {
  --preview-progress: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 5;
  width: 52px;
  height: 52px;
  border-radius: 50% !important;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background:
    conic-gradient(var(--bgm-genre-accent) calc(var(--preview-progress) * 1turn),
      rgba(255, 255, 255, 0.12) 0);
  background-clip: padding-box;
  display: grid;
  place-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease;
  padding: 0;
}

.bgm-genre-preview::before {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 50% !important;
  background: rgba(8, 10, 14, 0.92);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.bgm-genre-preview-icon {
  position: relative;
  z-index: 1;
  display: block;
  opacity: 0;
  visibility: hidden;
  transition: opacity 160ms ease;
  grid-area: 1 / 1;
}

.bgm-genre-preview-icon-stop {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: var(--bgm-genre-accent);
  box-shadow: 0 0 12px var(--bgm-genre-accent-soft);
}

.bgm-genre-preview-icon-play {
  width: 0;
  height: 0;
  border-left: 16px solid var(--bgm-genre-accent);
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  margin-left: 2px;
  filter: drop-shadow(0 0 8px var(--bgm-genre-accent-soft));
}

.bgm-genre-item-wrap.is-preview-available:not(.is-previewing):hover .bgm-genre-preview {
  opacity: 1;
}

.bgm-genre-item-wrap.is-preview-available:not(.is-previewing):hover .bgm-genre-preview-icon-play {
  opacity: 1;
  visibility: visible;
}

.bgm-genre-item-wrap.is-preview-available:not(.is-previewing):hover .bgm-genre-item.is-active+.bgm-genre-preview {
  opacity: 0;
}

.bgm-genre-item-wrap.is-preview-available:not(.is-previewing):hover .bgm-genre-item.is-active+.bgm-genre-preview .bgm-genre-preview-icon-play {
  opacity: 0;
  visibility: hidden;
}

.bgm-genre-item-wrap.is-previewing .bgm-genre-preview {
  opacity: 1;
  pointer-events: auto;
}

.bgm-genre-item-wrap.is-previewing .bgm-genre-preview-icon-stop {
  opacity: 1;
  visibility: visible;
}

.bgm-genre-item-wrap.is-previewing .bgm-genre-preview-icon-play {
  opacity: 0;
  visibility: hidden;
}

.bgm-genre-preview:focus-visible {
  outline: 2px solid var(--bgm-genre-accent);
  outline-offset: 2px;
}

.bgm-genre-preview:disabled {
  cursor: default;
}

/* =========================================================
  Nature ambience chips
========================================================= */
.bgm-ambience-card {
  background: var(--bgm-panel);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 18px;
  padding: 16px;
  box-shadow:
    0 18px 34px rgba(0, 0, 0, 0.5),
    inset 0 0 0 1px rgba(255, 255, 255, 0.02);
  display: grid;
  gap: var(--bgm-side-header-gap);
  position: relative;
  overflow: hidden;
}

.bgm-ambience-card::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  width: 4px;
  background: var(--bgm-ambience-accent);
  box-shadow: 0 0 12px var(--bgm-ambience-accent-soft);
}

.bgm-ambience-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-transform: uppercase;
  letter-spacing: var(--bgm-side-header-spacing);
  font-size: var(--bgm-side-header-size);
  color: var(--bgm-ambience-accent);
  padding: 0 6px;
}

.bgm-ambience-header .material-symbols-outlined {
  font-size: var(--bgm-side-header-icon);
  color: var(--bgm-ambience-accent);
}

.bgm-ambience-collapsible {
  min-width: 0;
}

.bgm-ambience-sub {
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-transform: uppercase;
  letter-spacing: 0.32em;
  font-size: 0.6rem;
  color: rgba(150, 160, 175, 0.7);
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.bgm-ambience-active {
  color: var(--bgm-ambience-accent);
  letter-spacing: 0.24em;
  font-weight: 600;
}

.bgm-ambience-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.bgm-ambience-chip {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: #0e1217;
  color: rgba(205, 216, 232, 0.88);
  border-radius: 12px;
  padding: 10px 8px 8px;
  min-height: 98px;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 8px;
  text-align: center;
  transition: border-color 200ms ease, box-shadow 200ms ease, transform 200ms ease, color 200ms ease;
}

.bgm-ambience-chip:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.2);
}

.bgm-ambience-chip:focus-visible {
  outline: 2px solid var(--bgm-ambience-accent);
  outline-offset: 2px;
}

.bgm-ambience-icon {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  color: rgba(212, 223, 239, 0.82);
  font-size: 22px;
}

.bgm-ambience-name {
  display: block;
  width: 100%;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.58rem;
  line-height: 1.15;
  color: rgba(214, 225, 241, 0.86);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bgm-ambience-slider {
  width: 100%;
  max-width: 112px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 5px;
  justify-self: center;
  box-sizing: border-box;
  padding-inline: 2px;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  pointer-events: none;
  transition: opacity 200ms ease, max-height 200ms ease;
}

.bgm-ambience-slider .material-symbols-outlined {
  font-size: 16px;
  color: rgba(178, 186, 200, 0.6);
}

.bgm-ambience-slider input[type="range"] {
  width: 100%;
  min-width: 0;
  accent-color: var(--bgm-ambience-accent);
}

.bgm-ambience-chip.is-active {
  align-content: start;
  border-color: var(--bgm-ambience-accent);
  color: var(--bgm-ambience-accent);
  box-shadow:
    0 0 0 1px rgba(247, 198, 47, 0.35),
    0 10px 18px rgba(0, 0, 0, 0.45);
}

.bgm-ambience-chip.is-active .bgm-ambience-icon,
.bgm-ambience-chip.is-active .bgm-ambience-name {
  color: var(--bgm-ambience-accent);
}

.bgm-ambience-chip.is-active .bgm-ambience-slider {
  opacity: 1;
  max-height: 40px;
  pointer-events: auto;
}

.bgm-ambience-chip.is-active .bgm-ambience-slider .material-symbols-outlined {
  color: var(--bgm-ambience-accent);
}

@media (max-width: 860px) {
  .bgm-panel {
    padding: 20px 18px 24px;
  }

  .bgm-panel-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .bgm-presets-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 1000px) {
  .bgm-layout {
    width: 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .bgm-panel {
    max-width: 100%;
    grid-column: 1 / -1;
  }

  .bgm-side {
    width: 100%;
  }

  .bgm-side-left,
  .bgm-side-right {
    justify-self: stretch;
  }

  .bgm-panel {
    order: 1;
  }

  .bgm-side-left {
    order: 2;
  }

  .bgm-side-right {
    order: 3;
  }

  .bgm-stage {
    padding: 0 10px 24px;
  }
}

/* =========================================================
  Audio matrix section (below main panel)
========================================================= */
.bgm-matrix {
  width: min(980px, 94vw);
  margin-top: 20px;
  background: var(--bgm-panel);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 18px;
  box-shadow: 0 20px 38px rgba(0, 0, 0, 0.55);
  padding: 16px 18px 20px;
}

.bgm-matrix-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 6px 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.bgm-matrix-title {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--bgm-ink);
}

.bgm-matrix-title-accent {
  color: #f7b934;
}

.bgm-matrix-icon {
  width: 18px;
  height: 18px;
  position: relative;
}

.bgm-matrix-icon::before,
.bgm-matrix-icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: #f7b934;
  box-shadow: 0 0 10px rgba(247, 185, 52, 0.55);
}

.bgm-matrix-icon::before {
  top: 4px;
}

.bgm-matrix-icon::after {
  bottom: 4px;
}

.bgm-matrix-route {
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(154, 169, 186, 0.6);
}

.bgm-matrix-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding: 16px 6px 0;
}

.bgm-matrix-card {
  background: var(--bgm-panel);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 12px;
  padding: 14px 16px 16px;
  display: grid;
  gap: var(--bgm-side-header-gap);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02);
  position: relative;
}

.bgm-side-left .bgm-matrix-card::before,
.bgm-side-right .bgm-matrix-card::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--matrix-accent);
  box-shadow: 0 0 12px var(--matrix-accent-soft);
}

.bgm-side-left .bgm-matrix-card::before {
  left: 0;
}

.bgm-side-right .bgm-matrix-card::before {
  right: 0;
}

.bgm-matrix-card.is-purple {
  --matrix-accent: #bf2cf6;
  --matrix-accent-soft: rgba(191, 44, 246, 0.35);
}

.bgm-matrix-card.is-amber {
  --matrix-accent: #f1b227;
  --matrix-accent-soft: rgba(241, 178, 39, 0.35);
}

.bgm-matrix-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 6px;
}

.bgm-matrix-collapse-toggle {
  display: none;
  border: none;
  background: transparent;
  color: currentColor;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  place-items: center;
  padding: 0;
  cursor: pointer;
}

.bgm-matrix-collapse-toggle .material-symbols-outlined {
  font-size: 20px;
  line-height: 1;
  transition: transform 180ms ease;
}

.bgm-matrix-collapsible {
  min-width: 0;
}

.bgm-matrix-card-label {
  text-transform: uppercase;
  letter-spacing: var(--bgm-side-header-spacing);
  font-size: var(--bgm-side-header-size);
  color: var(--matrix-accent);
}

.bgm-matrix-card-state {
  display: inline-flex;
  gap: 6px;
}

.bgm-matrix-card-state span {
  width: 4px;
  height: 14px;
  background: var(--matrix-accent);
  border-radius: 2px;
  box-shadow: 0 0 10px var(--matrix-accent-soft);
}

.bgm-matrix-card-icon {
  width: var(--bgm-side-header-icon);
  height: var(--bgm-side-header-icon);
  color: var(--matrix-accent);
  flex-shrink: 0;
  font-size: var(--bgm-side-header-icon);
  line-height: 1;
}

.bgm-matrix-select {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: #0a0c10;
  color: var(--bgm-ink);
  padding: 10px 12px;
  border-radius: 8px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.68rem;
}

.bgm-matrix-select-icon {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  display: inline-grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.05);
  color: var(--matrix-accent);
  font-size: 0.75rem;
}

.bgm-matrix-select-text {
  color: rgba(217, 224, 235, 0.75);
  letter-spacing: 0.16em;
  font-size: 0.68rem;
}

.bgm-matrix-slider {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
}

.bgm-matrix-audio-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: center;
  gap: 12px;
}

.bgm-matrix-audio-row .bgm-matrix-slider,
.bgm-matrix-audio-row .bgm-now-playing {
  min-width: 0;
}

.bgm-now-playing {
  margin: 0;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  /* background: linear-gradient(90deg, rgba(180, 75, 255, 0.12), rgba(8, 10, 14, 0.92) 65%); */
  padding: 8px 10px;
  display: grid;
  gap: 4px;
}

.bgm-now-playing-label {
  font-size: 0.56rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: rgba(179, 191, 209, 0.72);
}

.bgm-now-playing-title {
  font-family: "Rajdhani", "Segoe UI", sans-serif;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #f5edff;
  display: block;
  position: relative;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
}

.bgm-now-playing-title-text {
  display: inline-block;
  min-width: 100%;
  white-space: nowrap;
}

.bgm-now-playing-title.is-marquee .bgm-now-playing-title-text {
  animation: bgm-now-playing-marquee var(--bgm-now-playing-duration, 10s) linear infinite;
  will-change: transform;
}

.bgm-now-playing-title.is-empty {
  color: rgba(179, 191, 209, 0.62);
}

@keyframes bgm-now-playing-marquee {

  0%,
  14% {
    transform: translateX(0);
  }

  86%,
  100% {
    transform: translateX(calc(-1 * var(--bgm-now-playing-scroll, 0px)));
  }
}

@media (prefers-reduced-motion: reduce) {
  .bgm-now-playing-title.is-marquee .bgm-now-playing-title-text {
    animation: none;
    transform: none;
  }
}

.bgm-matrix-play,
.bgm-matrix-pause-icon,
.bgm-matrix-play-icon {
  border: none;
}

.bgm-matrix-play {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  display: grid;
  place-items: center;
}

.bgm-matrix-play-icon {
  width: 0;
  height: 0;
  border-left: 10px solid var(--matrix-accent);
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  margin-left: 2px;
  filter: drop-shadow(0 0 6px var(--matrix-accent-soft));
}

.bgm-matrix-pause-icon {
  width: 12px;
  height: 12px;
  position: relative;
}

.bgm-matrix-pause-icon::before,
.bgm-matrix-pause-icon::after {
  content: "";
  position: absolute;
  top: 0;
  width: 4px;
  height: 12px;
  background: var(--matrix-accent);
  box-shadow: 0 0 6px var(--matrix-accent-soft);
}

.bgm-matrix-pause-icon::before {
  left: 0;
}

.bgm-matrix-pause-icon::after {
  right: 0;
}

.bgm-matrix-range {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.bgm-matrix-range-label {
  font-size: 0.6rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(129, 142, 160, 0.7);
}

.bgm-matrix-volume-icon {
  font-size: 18px;
  color: var(--matrix-accent);
  line-height: 1;
  filter: drop-shadow(0 0 6px var(--matrix-accent-soft));
}

.bgm-matrix-range input[type="range"] {
  width: 100%;
  accent-color: var(--matrix-accent);
}

.bgm-matrix-range-value {
  font-size: 0.68rem;
  color: var(--matrix-accent);
}

@media (max-width: 600px) {
  body.page-bgm {
    --bgm-timer-digit-size: 1.38rem;
    --bgm-timer-wheel-item: 44px;
    --bgm-timer-wheel-max-width: 150px;
  }

  .bgm-side-left .bgm-genre-panel {
    grid-template-columns: repeat(auto-fit, minmax(88px, 1fr));
  }

  .bgm-side-left .bgm-matrix-card {
    gap: 0;
  }

  .bgm-side-left .bgm-matrix-card-top {
    justify-content: flex-start;
    gap: 8px;
    cursor: pointer;
    user-select: none;
  }

  .bgm-side-left .bgm-matrix-card-icon {
    margin-left: auto;
  }

  .bgm-side-left .bgm-matrix-collapse-toggle {
    display: grid;
    color: var(--matrix-accent);
  }

  .bgm-side-left .bgm-matrix-collapsible {
    margin-top: var(--bgm-side-header-gap);
    max-height: 2000px;
    opacity: 1;
    overflow: hidden;
    transition: max-height 260ms ease, opacity 180ms ease, margin-top 260ms ease;
  }

  .bgm-side-left .bgm-matrix-card.is-collapsed .bgm-matrix-collapsible {
    margin-top: 0;
    max-height: 0;
    opacity: 0;
    pointer-events: none;
  }

  .bgm-side-left .bgm-matrix-card.is-collapsed .bgm-matrix-collapse-toggle .material-symbols-outlined {
    transform: rotate(-90deg);
  }

  .bgm-side-right .bgm-ambience-card {
    gap: 0;
  }

  .bgm-side-right .bgm-ambience-header {
    justify-content: flex-start;
    gap: 8px;
    cursor: pointer;
    user-select: none;
  }

  .bgm-side-right .bgm-ambience-header-icon {
    margin-left: auto;
  }

  .bgm-side-right .bgm-ambience-header .bgm-matrix-collapse-toggle {
    display: grid;
    color: var(--bgm-ambience-accent);
  }

  .bgm-side-right .bgm-ambience-collapsible {
    margin-top: var(--bgm-side-header-gap);
    max-height: 2200px;
    opacity: 1;
    overflow: hidden;
    transition: max-height 260ms ease, opacity 180ms ease, margin-top 260ms ease;
  }

  .bgm-side-right .bgm-ambience-card.is-collapsed .bgm-ambience-collapsible {
    margin-top: 0;
    max-height: 0;
    opacity: 0;
    pointer-events: none;
  }

  .bgm-side-right .bgm-ambience-card.is-collapsed .bgm-ambience-header .bgm-matrix-collapse-toggle .material-symbols-outlined {
    transform: rotate(-90deg);
  }

  .bgm-layout {
    grid-template-columns: 1fr;
  }

  .bgm-stage {
    padding: 0 8px 24px;
  }

  .bgm-time-group {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .bgm-side-right .bgm-ambience-card::after {
    left: 0;
    right: auto;
  }

  .bgm-matrix {
    padding: 14px 14px 18px;
  }

  .bgm-matrix-grid {
    grid-template-columns: 1fr;
  }
}