/* ==================== RESET & BASE ==================== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-primary: #0f0f0f;
  --bg-secondary: #181818;
  --bg-tertiary: #212121;
  --bg-hover: #2a2a2a;
  --bg-active: #333;
  --text-primary: #f1f1f1;
  --text-secondary: #aaaaaa;
  --text-muted: #717171;
  --accent: #ff0000;
  --accent-hover: #cc0000;
  --sidebar-width: 240px;
  --player-height: 80px;
  --radius: 8px;
  --radius-sm: 4px;
  --transition: 0.2s ease;
  --shadow: 0 2px 8px rgba(0,0,0,0.5);
}

html { font-size: 14px; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  min-height: 100vh;
  overflow: hidden;
  user-select: none;
}

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-active); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

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

input {
  font-family: inherit;
  color: inherit;
}

.empty-prompt {
  color: var(--text-muted);
  text-align: center;
  padding: 40px;
  font-size: 0.95rem;
}

/* ==================== SIDEBAR ==================== */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: calc(100vh - var(--player-height));
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 12px 0;
  transition: all 0.3s ease;
  border-right: 1px solid var(--bg-tertiary);
}

.sidebar.collapsed {
  width: 72px;
  min-width: 72px;
}

.sidebar.collapsed .sidebar-nav span,
.sidebar.collapsed .sidebar-title,
.sidebar.collapsed .playlists-list,
.sidebar.collapsed .create-playlist-btn,
.sidebar.collapsed .sidebar-section h3 {
  display: none;
}

.sidebar.collapsed .sidebar-nav .nav-item {
  justify-content: center;
  padding: 12px;
}

.sidebar-header {
  display: flex;
  align-items: center;
  padding: 8px 20px 20px;
  gap: 10px;
}

.sidebar-header .logo {
  width: 32px;
  height: 32px;
}

.sidebar-header .logo-text {
  font-size: 1.2rem;
  font-weight: 700;
  background: linear-gradient(135deg, #ff0000, #ff6b6b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sidebar-nav {
  padding: 0 8px;
  margin-bottom: 16px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 16px;
  width: 100%;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.nav-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.nav-item.active {
  background: var(--bg-active);
  color: var(--text-primary);
}

.sidebar-section {
  padding: 8px 16px;
  flex-grow: 1;
  overflow-y: auto;
}

.sidebar-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 8px;
  padding: 0 8px;
}

.playlists-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.playlist-item {
  text-align: left;
  padding: 8px 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  width: 100%;
}

.playlist-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.create-playlist-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 16px;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius);
  transition: all var(--transition);
  border: 1px dashed var(--bg-active);
  width: calc(100% - 32px);
  justify-content: center;
}

.create-playlist-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.create-playlist-btn.small {
  margin: 0;
  padding: 6px 12px;
  width: auto;
  border: 1px solid var(--bg-active);
}

/* ==================== MAIN CONTENT ==================== */
.main-content {
  flex-grow: 1;
  height: calc(100vh - var(--player-height));
  overflow-y: auto;
  position: relative;
  transition: all 0.3s ease;
}

.main-content.expanded {
  margin-left: 0;
}

/* ==================== VIEWS ==================== */
.view { display: none; }
.view.active { display: block; }

.top-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 24px;
  border-bottom: 1px solid var(--bg-tertiary);
  backdrop-filter: blur(10px);
  background: rgba(15, 15, 15, 0.9);
}

.menu-toggle {
  display: flex;
  align-items: center;
  padding: 8px;
  border-radius: 50%;
  transition: background var(--transition);
}

.menu-toggle:hover { background: var(--bg-hover); }

.top-bar-search {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-grow: 1;
  max-width: 560px;
  background: var(--bg-secondary);
  border: 1px solid var(--bg-tertiary);
  border-radius: 24px;
  padding: 8px 16px;
  transition: border-color var(--transition);
}

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

.top-bar-search svg {
  color: var(--text-muted);
  flex-shrink: 0;
}

.top-bar-search input {
  flex-grow: 1;
  background: none;
  border: none;
  outline: none;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.top-bar-text {
  font-size: 1.1rem;
  font-weight: 600;
}

/* ==================== HOME VIEW ==================== */
.content-area { padding: 24px; }

.greeting-section h1 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.content-section { margin-bottom: 32px; }

.content-section h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.explore-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.category-chip {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  transition: all var(--transition);
}

.category-chip:hover {
  background: var(--bg-active);
  color: var(--text-primary);
}

.category-chip.active {
  background: var(--accent);
  color: white;
}

/* ==================== CARDS GRID ==================== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}

.track-card {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 12px;
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
}

.track-card:hover {
  background: var(--bg-tertiary);
  transform: translateY(-2px);
}

.track-card:hover .card-play-overlay {
  opacity: 1;
}

.card-thumb {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 10px;
}

.card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.card-play-overlay {
  position: absolute;
  bottom: 8px;
  right: 8px;
  width: 40px;
  height: 40px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all var(--transition);
  box-shadow: var(--shadow);
}

.card-info { min-height: 50px; }

.card-title {
  font-size: 0.88rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.card-artist {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.playlist-card .card-thumb {
  background: linear-gradient(135deg, #1a1a2e, #16213e);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ==================== SEARCH VIEW ==================== */
.search-results {
  padding: 24px;
}

.search-placeholder {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
}

.search-placeholder h2 {
  font-size: 1.5rem;
  margin-top: 16px;
  color: var(--text-secondary);
}

.search-placeholder p {
  margin-top: 8px;
  font-size: 0.9rem;
}

/* ==================== LIBRARY VIEW ==================== */
.library-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.library-header h2 { font-size: 1.4rem; font-weight: 600; }

/* ==================== FAVORITES VIEW ==================== */
.section-banner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px 0;
  margin-bottom: 16px;
  background: linear-gradient(135deg, rgba(255,0,0,0.1), rgba(255,107,107,0.1));
  border-radius: var(--radius);
  border: 1px solid rgba(255,0,0,0.2);
}

.section-banner svg { color: var(--accent); flex-shrink: 0; }

.section-banner h2 {
  font-size: 1.3rem;
  font-weight: 600;
}

.section-banner p {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 4px;
}

/* ==================== TRACK LIST ==================== */
.track-list { display: flex; flex-direction: column; }

.track-list-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition);
}

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

.track-thumb {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
}

.track-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.track-list-info { flex-grow: 1; min-width: 0; }

.track-list-title {
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-list-artist {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.track-list-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ==================== NOW PLAYING BAR ==================== */
.now-playing-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--player-height);
  background: var(--bg-secondary);
  border-top: 1px solid var(--bg-tertiary);
  display: flex;
  align-items: center;
  padding: 0 16px;
  z-index: 1000;
  gap: 16px;
}

.now-playing-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 200px;
  max-width: 300px;
  cursor: pointer;
}

.now-playing-left:hover .track-info * { color: var(--text-primary); }

.video-thumbnail {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 1.5rem;
}

.video-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.track-title {
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color var(--transition);
}

.track-artist {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color var(--transition);
}

.fav-btn {
  display: flex;
  align-items: center;
  color: var(--text-muted);
  transition: all var(--transition);
  flex-shrink: 0;
}

.fav-btn:hover { color: var(--text-primary); }

.fav-btn.active,
.fav-btn.active svg { color: var(--accent); }

.fav-btn.small { flex-shrink: 0; }

/* ==================== CONTROLS ==================== */
.now-playing-controls {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.controls-center {
  display: flex;
  align-items: center;
  gap: 16px;
}

.control-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition);
  padding: 4px;
}

.control-btn:hover { color: var(--text-primary); }
.control-btn.active { color: var(--accent); }

.play-btn {
  width: 40px;
  height: 40px;
  background: var(--text-primary);
  color: var(--bg-primary);
  border-radius: 50%;
  transition: all var(--transition);
}

.play-btn:hover {
  transform: scale(1.08);
  background: white;
}

.progress-section {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  max-width: 600px;
}

.time {
  font-size: 0.7rem;
  color: var(--text-muted);
  min-width: 36px;
  text-align: center;
}

.progress-bar-container {
  flex-grow: 1;
  cursor: pointer;
  padding: 4px 0;
}

.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--bg-active);
  border-radius: 2px;
  overflow: hidden;
  transition: height var(--transition);
}

.progress-bar:hover { height: 6px; }

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.1s linear;
  width: 0%;
}

.now-playing-right {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 200px;
  justify-content: flex-end;
}

.volume-control {
  display: flex;
  align-items: center;
  gap: 4px;
}

.volume-slider {
  -webkit-appearance: none;
  width: 80px;
  height: 4px;
  background: var(--bg-active);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  background: var(--text-primary);
  border-radius: 50%;
}

/* ==================== QUEUE SIDEBAR ==================== */
.queue-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.queue-overlay.visible {
  opacity: 1;
  pointer-events: all;
}

.queue-sidebar {
  position: fixed;
  top: 0;
  right: -320px;
  width: 320px;
  height: calc(100vh - var(--player-height));
  background: var(--bg-secondary);
  z-index: 1000;
  transition: right 0.3s ease;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--bg-tertiary);
}

.queue-sidebar.open { right: 0; }

.queue-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px;
  border-bottom: 1px solid var(--bg-tertiary);
}

.queue-header h3 { font-size: 1.1rem; font-weight: 600; }

.close-queue {
  font-size: 1.5rem;
  color: var(--text-muted);
  padding: 4px 8px;
}

.close-queue:hover { color: var(--text-primary); }

.queue-now-playing, .queue-up-next {
  padding: 16px 20px;
  flex-grow: 1;
  overflow-y: auto;
}

.queue-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  display: block;
  margin-bottom: 12px;
}

.queue-track {
  padding: 8px 0;
}

.queue-track-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition);
  margin-bottom: 4px;
}

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

.queue-track-thumb {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
}

.queue-track-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.queue-track-info {
  flex-grow: 1;
  min-width: 0;
}

.queue-track-info .queue-track-title {
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.queue-track-info .queue-track-artist {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.queue-divider {
  border: none;
  border-top: 1px solid var(--bg-tertiary);
}

/* ==================== MODAL ==================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay.visible {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 24px;
  width: 360px;
  max-width: 90vw;
  box-shadow: var(--shadow);
}

.modal h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.modal input[type="text"] {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--bg-active);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-primary);
  margin-bottom: 16px;
  outline: none;
}

.modal input[type="text"]:focus {
  border-color: var(--accent);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.btn {
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover { background: var(--accent-hover); }

.btn-secondary {
  background: var(--bg-active);
  color: var(--text-secondary);
}

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

/* ==================== RESPONSIVE ==================== */
@media (max-width: 900px) {
  .sidebar {
    position: fixed;
    left: -280px;
    z-index: 1001;
    height: calc(100vh - var(--player-height));
  }
  .sidebar.collapsed,
  .sidebar:not(.collapsed) {
    left: -280px;
  }
  .sidebar.open-mobile {
    left: 0;
  }
  .now-playing-right { display: none; }
  .cards-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
}

@media (max-width: 600px) {
  :root { --player-height: 64px; }

  .now-playing-bar {
    padding: 0 8px;
    gap: 8px;
  }

  .now-playing-left { min-width: 0; max-width: 150px; }

  .video-thumbnail { width: 40px; height: 40px; }

  .track-title { font-size: 0.8rem; }
  .track-artist { font-size: 0.7rem; }

  .time { display: none; }

  .controls-center { gap: 8px; }

  .progress-section { max-width: 300px; }

  .cards-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 10px;
  }

  .content-area { padding: 16px; }
  .greeting-section h1 { font-size: 1.5rem; }
  .content-section h2 { font-size: 1.1rem; }
}