*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f0f4f8;
  color: #1a202c;
  min-height: 100vh;
}

header {
  background: #2d3748;
  color: #fff;
  padding: 1rem 1.5rem;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 700;
}

main {
  max-width: 700px;
  margin: 1.5rem auto;
  padding: 0 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.card {
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,.08);
  padding: 1.25rem 1.5rem;
}

.card h2 {
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: #718096;
  margin-bottom: 1rem;
}

/* Playback */
.track-uri {
  font-size: .9rem;
  color: #4a5568;
  word-break: break-all;
  min-height: 1.2em;
  margin-bottom: .75rem;
}

.playback-controls {
  display: flex;
  gap: .5rem;
  margin-bottom: 1rem;
}

.volume-row {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.volume-row label { font-size: .875rem; color: #718096; white-space: nowrap; }
.volume-row input  { flex: 1; }
#volume-label      { font-size: .875rem; width: 2rem; text-align: right; }

/* Buttons */
.btn {
  padding: .45rem .9rem;
  border: none;
  border-radius: 6px;
  font-size: .875rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .15s;
}

.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn:not(:disabled):hover { opacity: .85; }

.btn-primary   { background: #4299e1; color: #fff; }
.btn-secondary { background: #e2e8f0; color: #2d3748; }
.btn-danger    { background: #fc8181; color: #fff; }

/* Device info */
.info-table { width: 100%; border-collapse: collapse; margin-bottom: .75rem; }
.info-table th, .info-table td { padding: .35rem .5rem; text-align: left; font-size: .875rem; }
.info-table th { color: #718096; width: 40%; }
.info-table tr:not(:last-child) th,
.info-table tr:not(:last-child) td { border-bottom: 1px solid #edf2f7; }

/* Storage */
.storage-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: .75rem;
  font-size: .875rem;
  color: #4a5568;
}

.cache-list { list-style: none; }

.cache-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .4rem 0;
  border-bottom: 1px solid #edf2f7;
  font-size: .875rem;
}

.cache-list li:last-child { border-bottom: none; }

.cache-list .cache-key { font-family: monospace; color: #4a5568; }
.cache-list .cache-size { color: #a0aec0; }

/* Bluetooth */
.bt-status { font-weight: 600; margin-bottom: .5rem; }
#btn-bt-toggle { margin-bottom: .5rem; }
.note { font-size: .8rem; color: #a0aec0; }