:root {
  color-scheme: dark;
  --background: #151515;
  --surface: #20201f;
  --surface-raised: #292927;
  --line: #3b3b37;
  --text: #f6f3ea;
  --muted: #a4a39d;
  --accent: #57d4a0;
  --accent-strong: #31b982;
  --warm: #ff7b62;
  --danger: #ff6d6d;
  --radius: 6px;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: Inter, "Segoe UI", "Microsoft YaHei", sans-serif;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
input:focus-visible,
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.topbar {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 clamp(20px, 4vw, 52px);
  border-bottom: 1px solid var(--line);
  background: rgba(21, 21, 21, 0.94);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  gap: 11px;
  align-items: center;
  color: var(--text);
  font-size: 19px;
  font-weight: 750;
  text-decoration: none;
}

.brand-mark {
  display: flex;
  gap: 3px;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius);
  background: var(--accent);
}

.brand-mark span {
  width: 2px;
  border-radius: 2px;
  background: #11251d;
}

.brand-mark span:nth-child(1) {
  height: 8px;
}

.brand-mark span:nth-child(2) {
  height: 17px;
}

.brand-mark span:nth-child(3) {
  height: 12px;
}

.brand-mark span:nth-child(4) {
  height: 20px;
}

.command-button,
.default-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  gap: 8px;
  border: 0;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 700;
  transition: background-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.command-button {
  padding: 0 16px;
  background: var(--accent);
  color: #10251c;
}

.command-button:hover {
  background: #70deb0;
}

.command-button:active,
.default-button:active,
.icon-button:active,
.play-button:active {
  transform: translateY(1px);
}

.command-button svg,
.default-button svg,
.icon-button svg,
.play-button svg,
.volume-button svg,
.mode-button svg,
.search-field svg,
.empty-state svg {
  width: 19px;
  height: 19px;
  stroke-width: 2;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  min-height: calc(100vh - var(--header-height));
}

.library {
  min-width: 0;
  padding: 36px 24px;
  border-right: 1px solid var(--line);
  background: #191918;
}

.section-heading,
.title-row,
.time-row,
.volume-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.section-heading {
  gap: 16px;
  margin-bottom: 22px;
}

.eyebrow {
  margin: 0 0 7px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.section-heading h2 {
  margin: 0;
  font-size: 24px;
  line-height: 1.15;
}

.track-count {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.search-field {
  display: flex;
  align-items: center;
  height: 42px;
  margin-bottom: 18px;
  padding: 0 13px;
  gap: 9px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
}

.search-field:focus-within {
  border-color: var(--accent);
}

.search-field input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
}

.search-field input::placeholder {
  color: #777771;
}

.track-list {
  display: grid;
  gap: 8px;
}

.track-item {
  position: relative;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 24px;
  align-items: center;
  width: 100%;
  min-height: 64px;
  padding: 9px 11px;
  gap: 11px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  text-align: left;
  transition: border-color 160ms ease, background-color 160ms ease;
}

.track-item:hover {
  background: var(--surface);
}

.track-item.is-current {
  border-color: #4e514c;
  background: var(--surface-raised);
}

.track-index {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 4px;
  background: #343431;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.track-item.is-current .track-index {
  background: var(--accent);
  color: #10251c;
}

.track-copy {
  min-width: 0;
}

.track-name,
.track-file {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.track-name {
  margin-bottom: 5px;
  font-size: 14px;
  font-weight: 700;
}

.track-file {
  color: var(--muted);
  font-size: 11px;
}

.track-default {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  color: var(--warm);
}

.track-default svg {
  width: 15px;
  height: 15px;
  fill: currentColor;
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 180px;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
}

.empty-state[hidden] {
  display: none;
}

.empty-state svg {
  width: 30px;
  height: 30px;
  color: var(--warm);
}

.player {
  display: grid;
  grid-template-columns: minmax(260px, 430px) minmax(280px, 520px);
  align-items: center;
  justify-content: center;
  min-width: 0;
  padding: clamp(34px, 7vw, 96px);
  gap: clamp(34px, 6vw, 88px);
}

.player-visual {
  position: relative;
  width: 100%;
  max-width: 430px;
  aspect-ratio: 1;
}

.player-visual img {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: var(--radius);
  object-fit: cover;
  background: #2c2b29;
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.32);
}

.playing-indicator {
  position: absolute;
  right: 16px;
  bottom: 16px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  width: 46px;
  height: 34px;
  padding: 8px;
  gap: 3px;
  border-radius: 4px;
  background: rgba(20, 20, 20, 0.82);
  opacity: 0;
  transition: opacity 160ms ease;
}

.playing-indicator.is-active {
  opacity: 1;
}

.playing-indicator span {
  width: 3px;
  height: 6px;
  border-radius: 2px;
  background: var(--accent);
}

.playing-indicator.is-active span {
  animation: meter 900ms ease-in-out infinite alternate;
}

.playing-indicator span:nth-child(2) {
  animation-delay: -520ms;
}

.playing-indicator span:nth-child(3) {
  animation-delay: -210ms;
}

.playing-indicator span:nth-child(4) {
  animation-delay: -690ms;
}

@keyframes meter {
  from {
    height: 5px;
  }
  to {
    height: 18px;
  }
}

.now-playing {
  min-width: 0;
}

.now-playing > .eyebrow {
  margin-bottom: 13px;
}

.title-row {
  align-items: flex-start;
  min-width: 0;
  gap: 20px;
}

.title-copy {
  min-width: 0;
}

.title-copy h1 {
  max-width: 100%;
  margin: 0 0 10px;
  overflow-wrap: anywhere;
  font-size: clamp(30px, 4vw, 54px);
  line-height: 1.05;
}

.title-copy p {
  max-width: 100%;
  margin: 0;
  overflow: hidden;
  color: var(--muted);
  font-size: 14px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.default-button {
  flex: 0 0 auto;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-size: 12px;
}

.default-button:not(:disabled):hover {
  border-color: var(--warm);
  color: var(--warm);
}

.default-button.is-default {
  border-color: #75503e;
  color: var(--warm);
  cursor: default;
}

.default-button.is-default svg {
  fill: currentColor;
}

.default-button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.timeline {
  margin-top: 58px;
}

.range {
  width: 100%;
  height: 22px;
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

.time-row {
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.transport {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 30px;
  gap: 18px;
}

.icon-button,
.play-button,
.volume-button {
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
}

.icon-button {
  width: 46px;
  height: 46px;
  background: transparent;
  color: var(--muted);
}

.icon-button:hover,
.volume-button:hover {
  color: var(--text);
  background: var(--surface-raised);
}

.play-button {
  width: 68px;
  height: 68px;
  background: var(--accent);
  color: #10251c;
}

.play-button:hover {
  background: #70deb0;
}

.play-button svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.mode-control {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  width: min(100%, 330px);
  margin: 26px auto 0;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.mode-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  min-height: 38px;
  padding: 0 12px;
  gap: 7px;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
  transition: background-color 160ms ease, color 160ms ease;
}

.mode-button:hover {
  color: var(--text);
}

.mode-button.is-active {
  background: #3a3d38;
  color: var(--accent);
}

.mode-button:disabled {
  cursor: wait;
  opacity: 0.6;
}

.volume-row {
  justify-content: center;
  max-width: 260px;
  margin: 18px auto 0;
  gap: 8px;
}

.volume-button {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  background: transparent;
  color: var(--muted);
}

.volume-range {
  min-width: 0;
}

.toast {
  position: fixed;
  z-index: 50;
  right: 22px;
  bottom: 22px;
  max-width: min(360px, calc(100vw - 44px));
  padding: 12px 15px;
  border: 1px solid #4a4a45;
  border-radius: var(--radius);
  background: #2b2b28;
  color: var(--text);
  box-shadow: 0 16px 42px rgba(0, 0, 0, 0.35);
  font-size: 13px;
}

.toast.is-error {
  border-color: var(--danger);
}

@media (max-width: 1020px) {
  .app-shell {
    grid-template-columns: 280px minmax(0, 1fr);
  }

  .player {
    grid-template-columns: minmax(230px, 340px);
    align-content: center;
    gap: 34px;
  }

  .player-visual {
    max-width: 340px;
    margin: 0 auto;
  }

  .timeline {
    margin-top: 34px;
  }
}

@media (max-width: 720px) {
  :root {
    --header-height: 64px;
  }

  .topbar {
    padding: 0 16px;
  }

  .command-button {
    width: 42px;
    min-height: 42px;
    padding: 0;
  }

  .command-button span {
    position: absolute;
    overflow: hidden;
    width: 1px;
    height: 1px;
    clip: rect(0 0 0 0);
  }

  .app-shell {
    display: flex;
    flex-direction: column;
  }

  .player {
    order: 1;
    grid-template-columns: minmax(0, 1fr);
    padding: 28px 20px 42px;
    gap: 30px;
  }

  .player-visual {
    width: min(76vw, 340px);
  }

  .title-row {
    gap: 12px;
  }

  .title-copy h1 {
    font-size: 31px;
  }

  .default-button span {
    position: absolute;
    overflow: hidden;
    width: 1px;
    height: 1px;
    clip: rect(0 0 0 0);
  }

  .default-button {
    width: 40px;
    padding: 0;
  }

  .timeline {
    margin-top: 32px;
  }

  .library {
    order: 2;
    padding: 32px 18px 48px;
    border-top: 1px solid var(--line);
    border-right: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}