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

body {
  background: #1a1a2e;
  color: #eee;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

#status-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 16px;
  background: #16213e;
  border-bottom: 1px solid #0f3460;
  flex-shrink: 0;
  flex-wrap: wrap;
}

#midi-status {
  font-size: 14px;
  white-space: nowrap;
}

#midi-status.connected {
  color: #00e676;
}

#midi-status.disconnected {
  color: #ff5252;
}

#device-select,
#time-sig {
  background: #0f3460;
  color: #eee;
  border: 1px solid #1a5276;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 13px;
  max-width: 300px;
}

/* --- Metronome Controls --- */
#metronome-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

#btn-metro {
  background: #0f3460;
  color: #eee;
  border: 1px solid #1a5276;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
}

#btn-metro:hover {
  background: #1a5276;
}

#btn-metro.active {
  background: #1b5e20;
  border-color: #2e7d32;
  color: #a5d6a7;
}

.bpm-label {
  font-size: 11px;
  color: #aaa;
  display: flex;
  align-items: center;
  gap: 4px;
}

#bpm-input {
  width: 52px;
  background: #0f3460;
  color: #eee;
  border: 1px solid #1a5276;
  border-radius: 4px;
  padding: 3px 6px;
  font-size: 12px;
  text-align: center;
  -moz-appearance: textfield;
}

#bpm-input::-webkit-inner-spin-button,
#bpm-input::-webkit-outer-spin-button {
  opacity: 1;
}

#beat-indicators {
  display: flex;
  align-items: center;
  gap: 4px;
}

.beat-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #2a2a4a;
  border: 1px solid #3a3a5a;
  transition: background 0.08s, box-shadow 0.08s;
}

.beat-dot.active {
  background: #4fc3f7;
  box-shadow: 0 0 6px rgba(79, 195, 247, 0.6);
}

.beat-dot.downbeat {
  background: #ff9800;
  box-shadow: 0 0 8px rgba(255, 152, 0, 0.7);
}

/* --- Volume Controls --- */
#volume-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.vol-label {
  font-size: 11px;
  color: #aaa;
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

.vol-label input[type="range"] {
  width: 60px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: #2a2a4a;
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.vol-label input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #4fc3f7;
  border: none;
  cursor: pointer;
}

.vol-label input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #4fc3f7;
  border: none;
  cursor: pointer;
}

#rec-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

#rec-controls button,
#rec-controls label {
  background: #0f3460;
  color: #eee;
  border: 1px solid #1a5276;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: background 0.15s, opacity 0.15s;
}

#rec-controls button:hover:not(:disabled),
#rec-controls label:hover {
  background: #1a5276;
}

#rec-controls button:disabled {
  opacity: 0.4;
  cursor: default;
}

#btn-rec.recording {
  background: #c62828;
  border-color: #e53935;
  color: #fff;
}

#btn-rec.recording::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ff5252;
  animation: rec-blink 0.8s ease-in-out infinite;
}

@keyframes rec-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

#btn-play.playing {
  background: #1b5e20;
  border-color: #2e7d32;
}

#waterfall {
  flex: 1;
  min-height: 0;
  width: 100%;
  display: block;
}

#piano {
  display: flex;
  position: relative;
  height: 120px;
  flex-shrink: 0;
  background: #111;
}

.key {
  position: relative;
  border: 1px solid #333;
  cursor: pointer;
  transition: background-color 0.05s;
}

.key.white {
  flex: 1;
  height: 100%;
  background: #f0f0f0;
  z-index: 1;
}

.key.black {
  position: absolute;
  width: 1.2%;
  height: 60%;
  background: #222;
  z-index: 2;
  border-radius: 0 0 4px 4px;
}

.key.white.active {
  background: var(--highlight, #4fc3f7);
}

.key.black.active {
  background: var(--highlight, #29b6f6);
}

/* --- Join Overlay --- */
#join-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.join-card {
  background: #16213e;
  border: 1px solid #0f3460;
  border-radius: 12px;
  padding: 32px 40px;
  text-align: center;
  max-width: 360px;
  width: 90%;
}

.join-card h2 {
  font-size: 22px;
  margin-bottom: 8px;
  color: #4fc3f7;
}

.join-card p {
  font-size: 13px;
  color: #aaa;
  margin-bottom: 20px;
}

#nickname-input {
  width: 100%;
  padding: 10px 14px;
  background: #0f3460;
  color: #eee;
  border: 1px solid #1a5276;
  border-radius: 6px;
  font-size: 15px;
  outline: none;
  margin-bottom: 14px;
}

#nickname-input:focus {
  border-color: #4fc3f7;
}

#join-btn {
  width: 100%;
  padding: 10px;
  background: #4fc3f7;
  color: #1a1a2e;
  border: none;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
}

#join-btn:hover {
  background: #29b6f6;
}

/* --- Share Bar --- */
#share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 16px;
  background: #0d1b2a;
  border-bottom: 1px solid #0f3460;
  flex-shrink: 0;
  flex-wrap: wrap;
  font-size: 13px;
}

#copy-link-btn {
  background: #0f3460;
  color: #4fc3f7;
  border: 1px solid #1a5276;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

#copy-link-btn:hover {
  background: #1a5276;
}

#connection-status {
  color: #ff9800;
  font-size: 12px;
}

/* --- User List --- */
#user-list {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-left: auto;
}

.user-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: #ccc;
  background: #16213e;
  padding: 2px 8px;
  border-radius: 10px;
  border: 1px solid #1a5276;
}

.user-tag.me {
  border-color: #4fc3f7;
  color: #fff;
}

.user-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

/* --- Tablet & Mobile responsive --- */
@media (max-width: 1024px) {
  #status-bar {
    padding: 6px 10px;
    gap: 8px;
    font-size: 12px;
  }

  #piano {
    height: 100px;
  }

  .vol-label input[type="range"] {
    width: 50px;
  }
}

@media (max-width: 768px) {
  #status-bar {
    padding: 4px 8px;
    gap: 6px;
    font-size: 11px;
  }

  #piano {
    height: 80px;
  }

  #rec-controls {
    margin-left: 0;
  }

  .vol-label input[type="range"] {
    width: 40px;
  }

  #bpm-input {
    width: 44px;
  }
}