(() => {
  const SHOW_AUDIO_CONTROL = true
  const AUDIO_SOURCE = '/Locil%20Forecast%20-%20Elevator.mp3'

  const style = document.createElement('style')
  style.textContent = `
    #mclive-floating-controls {
      --mclive-control-night: #041117;
      --mclive-control-ice: #d7f1e8;
      --mclive-control-mist: #8fafb2;
      --mclive-control-gold: #c6a15b;
      --mclive-control-online: #72aa86;
      --mclive-control-line: rgba(166, 209, 203, 0.22);
      position: fixed;
      z-index: 2147483647;
      top: 94px;
      right: clamp(20px, 3vw, 44px);
      width: 190px;
      display: flex;
      flex-direction: column;
      align-items: stretch;
      border: 1px solid var(--mclive-control-line);
      background: rgba(4, 17, 23, 0.92);
      box-shadow: 0 18px 52px rgba(0, 0, 0, 0.3);
      -webkit-backdrop-filter: blur(14px);
      backdrop-filter: blur(14px);
      pointer-events: none;
    }

    #mclive-floating-controls:has(.mclive-countdown-restore:not(.is-visible)) .mclive-audio-control {
      border-bottom: 0;
    }

    .mclive-floating-control {
      width: 100%;
      min-height: 46px;
      padding: 0 13px;
      display: inline-flex;
      align-items: center;
      justify-content: flex-start;
      gap: 9px;
      border: 0;
      border-bottom: 1px solid var(--mclive-control-line);
      color: var(--mclive-control-ice);
      background: transparent;
      cursor: pointer;
      font-family: 'IBM Plex Mono', ui-monospace, monospace;
      font-size: 8px;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      pointer-events: auto;
    }

    .mclive-floating-control:hover {
      background: rgba(198, 161, 91, 0.08);
    }

    .mclive-floating-control:focus-visible {
      outline: 2px solid var(--mclive-control-gold);
      outline-offset: 4px;
    }

    .mclive-floating-control svg {
      width: 14px;
      height: 14px;
      fill: currentColor;
    }

    .mclive-control-status {
      width: 6px;
      height: 6px;
      flex: 0 0 auto;
      background: var(--mclive-control-mist);
      box-shadow: 0 0 0 transparent;
      transition: background 0.2s ease, box-shadow 0.2s ease;
    }

    .mclive-audio-control.is-playing .mclive-control-status {
      background: var(--mclive-control-online);
      box-shadow: 0 0 10px rgba(114, 170, 134, 0.7);
    }

    .mclive-control-name {
      min-width: 0;
      flex: 1;
      color: var(--mclive-control-mist);
      text-align: left;
    }

    .mclive-control-value {
      color: var(--mclive-control-ice);
      font-variant-numeric: tabular-nums;
      text-align: right;
    }

    .mclive-audio-icon {
      width: 14px;
      height: 14px;
      display: grid;
      place-items: center;
      color: var(--mclive-control-gold);
    }

    @media (max-width: 620px) {
      #mclive-floating-controls {
        top: auto;
        right: 16px;
        bottom: 16px;
        width: 168px;
      }

      .mclive-floating-control {
        min-height: 44px;
        padding: 0 11px;
      }
    }
  `

  let controls = document.getElementById('mclive-floating-controls')
  if (!controls) {
    controls = document.createElement('div')
    controls.id = 'mclive-floating-controls'
    document.body.appendChild(controls)
  }

  const audioButton = document.createElement('button')
  audioButton.className = 'mclive-floating-control mclive-audio-control'
  audioButton.type = 'button'
  audioButton.hidden = !SHOW_AUDIO_CONTROL
  audioButton.setAttribute('aria-label', '播放背景音乐')
  audioButton.innerHTML = `
    <span class="mclive-control-status" aria-hidden="true"></span>
    <span class="mclive-control-name">AUDIO</span>
    <span class="mclive-control-value mclive-audio-label">OFF</span>
    <span class="mclive-audio-icon" aria-hidden="true"></span>
  `
  controls.appendChild(audioButton)
  document.head.appendChild(style)

  const audioIcon = audioButton.querySelector('.mclive-audio-icon')
  const audioLabel = audioButton.querySelector('.mclive-audio-label')
  const audio = new Audio(AUDIO_SOURCE)
  audio.loop = true
  audio.preload = 'auto'

  const playIcon = '<svg viewBox="0 0 24 24"><path d="M8 5v14l11-7z"/></svg>'
  const pauseIcon = '<svg viewBox="0 0 24 24"><path d="M6 5h4v14H6zm8 0h4v14h-4z"/></svg>'

  function updateAudioControl() {
    const playing = !audio.paused
    audioIcon.innerHTML = playing ? pauseIcon : playIcon
    audioLabel.textContent = playing ? 'ON' : 'OFF'
    audioButton.classList.toggle('is-playing', playing)
    audioButton.setAttribute('aria-label', playing ? '暂停背景音乐' : '播放背景音乐')
  }

  async function startAudio() {
    if (!audio.paused) return
    try {
      await audio.play()
    } catch {
      // Browsers may reject playback until a qualifying user gesture occurs.
    }
    updateAudioControl()
  }

  function handleFirstInteraction(event) {
    if (audioButton.contains(event.target)) return
    startAudio()
  }

  audioButton.addEventListener('click', async () => {
    if (audio.paused) await startAudio()
    else audio.pause()
    updateAudioControl()
  })
  audio.addEventListener('play', updateAudioControl)
  audio.addEventListener('pause', updateAudioControl)
  document.addEventListener('pointerdown', handleFirstInteraction, { passive: true })
  document.addEventListener('touchstart', handleFirstInteraction, { passive: true })
  document.addEventListener('keydown', handleFirstInteraction)
  updateAudioControl()
})()