/* ============================================
   DESIGN SYSTEM - Paleta Neutra Minimalista
   ============================================ */

:root {
  /* Backgrounds */
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #242424;
  --bg-elevated: #2a2a2a;

  /* Borders */
  --border-subtle: #2a2a2a;
  --border-medium: #3a3a3a;
  --border-strong: #4a4a4a;

  /* Text */
  --text-primary: #e8e8e8;
  --text-secondary: #9a9a9a;
  --text-muted: #6a6a6a;
  --text-disabled: #4a4a4a;

  /* Accents */
  --accent-primary: #f0f0f0;
  --accent-hover: #ffffff;
  --accent-active: #d0d0d0;

  /* Estados */
  --success: #88a880;
  --warning: #d4a574;
  --error: #b87474;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.5);

  /* Transições */
  --transition-fast: 150ms ease;
  --transition-medium: 250ms ease;
  --transition-slow: 400ms ease;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Typography */
  --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ============================================
   RESET & BASE
   ============================================ */

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

input[type="range"] {
  cursor: pointer;
}

/* ============================================
   LAYOUT PRINCIPAL
   ============================================ */

.app-container {
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-primary);
}

/* ============================================
   HEADER
   ============================================ */

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  height: 60px;
  flex-shrink: 0;
}

.header-center {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-md);
}

.header-left {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-md);
}

.app-title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.song-info {
  font-size: 13px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.header-right {
  display: flex;
  gap: var(--spacing-sm);
}

.btn-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background-color: var(--bg-elevated);
  color: var(--text-primary);
}

.btn-icon:active {
  transform: scale(0.95);
}

/* ============================================
   GAME CONTAINER
   ============================================ */

.game-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-primary);
  position: relative;
  overflow: hidden;
}

#gameCanvas {
  display: block;
  background-color: var(--bg-secondary);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  max-width: 100%;
  max-height: 100%;
}

/* ============================================
   FOOTER CONTROLS
   ============================================ */

.app-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  height: 80px;
  flex-shrink: 0;
}

.controls-left,
.controls-right {
  flex: 1;
  display: flex;
  align-items: center;
}

.controls-right {
  justify-content: flex-end;
}

.controls-center {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.btn-control {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.btn-control.btn-icon {
  width: 48px;
  height: 48px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-control:hover {
  background-color: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-control:active {
  transform: scale(0.98);
}

.btn-play {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--accent-primary);
  color: var(--bg-primary);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-play:hover {
  background-color: var(--accent-hover);
  transform: scale(1.05);
}

/* Volume Control */
.volume-control {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background-color: var(--bg-tertiary);
  border-radius: 6px;
  border: 1px solid var(--border-medium);
}

.volume-slider {
  width: 100px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border-medium);
  outline: none;
  border-radius: 2px;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  background: var(--accent-primary);
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.volume-slider::-webkit-slider-thumb:hover {
  background: var(--accent-hover);
  transform: scale(1.2);
}

.volume-slider::-moz-range-thumb {
  width: 12px;
  height: 12px;
  background: var(--accent-primary);
  border-radius: 50%;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
}

.volume-slider::-moz-range-thumb:hover {
  background: var(--accent-hover);
  transform: scale(1.2);
}

/* ============================================
   MIDI STATUS INDICATOR
   ============================================ */

.midi-status {
  /* position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg); */
  position: relative !important;
  top: auto !important;
  right: auto !important;
  bottom: auto !important;
  left: auto !important;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  box-shadow: var(--shadow-md);
  z-index: 100;
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--error);
  box-shadow: 0 0 8px var(--error);
  animation: pulse-disconnect 2s ease-in-out infinite;
}

.midi-status.connected .status-indicator {
  background-color: var(--success);
  box-shadow: 0 0 8px var(--success);
  animation: pulse-connect 2s ease-in-out infinite;
}

.midi-status.connected .status-text {
  color: var(--text-primary);
}

@keyframes pulse-connect {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes pulse-disconnect {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ============================================
   MODAL
   ============================================ */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.modal-content {
  background-color: var(--bg-secondary);
  border-radius: 12px;
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-medium);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-subtle);
}

.modal-header h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.btn-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--text-secondary);
  border-radius: 6px;
  transition: all var(--transition-fast);
}

.btn-close:hover {
  background-color: var(--bg-elevated);
  color: var(--text-primary);
}

.modal-body {
  padding: var(--spacing-lg);
  overflow-y: auto;
  flex: 1;
}

/* Song List */
.song-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.song-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.song-item:hover {
  background-color: var(--bg-elevated);
  border-color: var(--border-strong);
  transform: translateX(4px);
}

.song-item-info {
  flex: 1;
}

.song-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.song-meta {
  font-size: 12px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.song-item-duration {
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  .app-header,
  .app-controls {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .song-info {
    display: none;
  }

  .controls-left,
  .controls-right {
    flex: 0;
  }

  .volume-control {
    display: none;
  }
}