:root {
  --primary-color: #1db954;
  --primary-dark: #1ed760;
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-tertiary: #282828;
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --text-tertiary: #808080;
  --accent-purple: #667eea;
  --accent-blue: #2a5298;
  --border-color: #404040;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  --transition: all 0.3s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
}

html,
body {
  height: 100%;
}

/* Layout */
.main-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  margin-left: 250px;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: 250px;
  height: 100vh;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  z-index: 1000;
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.3);
}

.sidebar-header {
  padding: 24px 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -1px;
}

.logo i {
  color: var(--primary-dark);
  animation: spin 3s linear infinite;
}

.brand-name {
  background: linear-gradient(135deg, var(--primary-dark), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.toggle-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 24px;
  cursor: pointer;
  display: none;
}

.toggle-btn:hover {
  color: var(--primary-dark);
}

.sidebar-menu {
  padding: 16px 0;
}

.menu-section {
  padding: 8px 0;
  border-bottom: 1px solid var(--border-color);
}

.menu-section:last-child {
  border-bottom: none;
}

.section-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-tertiary);
  padding: 8px 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.nav-links,
.playlist-links {
  list-style: none;
}

.nav-link,
.playlist-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  font-size: 14px;
  border-left: 3px solid transparent;
}

.nav-link:hover,
.playlist-item:hover {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.05);
  padding-left: 18px;
}

.nav-link.active {
  color: var(--primary-dark);
  background-color: rgba(29, 185, 84, 0.1);
  border-left-color: var(--primary-dark);
}

.nav-link i,
.playlist-item i {
  width: 20px;
  text-align: center;
}

/* Header */
.top-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: linear-gradient(180deg, rgba(30, 30, 30, 0.9) 0%, rgba(18, 18, 18, 0.7) 100%);
  border-bottom: 1px solid var(--border-color);
  flex: 0 0 auto;
  backdrop-filter: blur(10px);
}

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

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

.header-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.search-bar {
  display: flex;
  align-items: center;
  background-color: var(--bg-tertiary);
  padding: 8px 16px;
  border-radius: 24px;
  border: 1px solid var(--border-color);
  flex: 1;
  min-width: 250px;
}

.search-bar input {
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  margin-left: 8px;
  width: 100%;
}

.search-bar input::placeholder {
  color: var(--text-tertiary);
}

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

.icon-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 18px;
  cursor: pointer;
  padding: 8px;
  transition: var(--transition);
  position: relative;
}

.icon-btn:hover {
  color: var(--text-primary);
  transform: scale(1.1);
}

.user-menu {
  position: relative;
}

.user-btn {
  background: none;
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
}

.user-btn:hover {
  box-shadow: 0 0 12px rgba(29, 185, 84, 0.5);
}

.user-btn img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  min-width: 200px;
  display: none;
  flex-direction: column;
  z-index: 1001;
  box-shadow: var(--shadow);
}

.user-menu:hover .dropdown-menu {
  display: flex;
}

.dropdown-menu a {
  padding: 12px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  font-size: 14px;
}

.dropdown-menu a:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

.dropdown-menu hr {
  margin: 8px 0;
  border-color: var(--border-color);
}

/* Content Area */
.content-wrapper {
  flex: 1;
  overflow-y: auto;
  padding-bottom: 100px;
  scroll-behavior: smooth;
}

.page-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

.page-content.active {
  display: block;
}

/* Hero Section */
.hero-section {
  padding: 60px 24px;
  margin-bottom: 32px;
  border-radius: 12px;
  margin: 24px;
  text-align: center;
  color: white;
}

.hero-content h1 {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 12px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.hero-content p {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 24px;
}

/* Sections */
.section {
  margin: 32px 24px;
}

.section h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

/* Grid Layouts */
.tracks-grid,
.discover-grid,
.artists-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}

.track-card,
.discover-card,
.artist-card {
  background-color: var(--bg-secondary);
  border-radius: 8px;
  padding: 16px;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.track-card:hover,
.discover-card:hover,
.artist-card:hover {
  background-color: var(--bg-tertiary);
  transform: translateY(-4px);
  border-color: var(--primary-dark);
  box-shadow: 0 4px 12px rgba(29, 185, 84, 0.2);
}

.track-image {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 6px;
  margin-bottom: 12px;
  object-fit: cover;
}

.track-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.track-artist {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Buttons */
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 24px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-primary {
  background-color: var(--primary-dark);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background-color: #1ed760;
  transform: scale(1.05);
}

.btn-outline-light {
  background-color: transparent;
  border: 1px solid var(--text-secondary);
  color: var(--text-secondary);
}

.btn-outline-light:hover {
  border-color: var(--text-primary);
  color: var(--text-primary);
}

/* Discover */
.discover-header {
  padding: 32px 24px 24px;
  text-align: center;
}

.discover-header h1 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 8px;
}

.discover-header p {
  color: var(--text-secondary);
}

.discover-filters {
  display: flex;
  gap: 12px;
  padding: 0 24px;
  overflow-x: auto;
  margin-bottom: 32px;
}

.discover-filters::-webkit-scrollbar {
  display: none;
}

.filter-btn {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.filter-btn:hover,
.filter-btn.active {
  background-color: var(--primary-dark);
  color: var(--bg-primary);
  border-color: var(--primary-dark);
}

/* Search */
.search-section {
  padding: 32px 24px;
}

.search-input-large {
  display: flex;
  align-items: center;
  background-color: var(--bg-secondary);
  padding: 12px 20px;
  border-radius: 32px;
  border: 2px solid var(--border-color);
  margin-bottom: 32px;
}

.search-input-large input {
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  margin-left: 12px;
  width: 100%;
  font-size: 16px;
}

.search-input-large input::placeholder {
  color: var(--text-tertiary);
}

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

.search-cat-btn {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition);
}

.search-cat-btn:hover,
.search-cat-btn.active {
  background-color: var(--primary-dark);
  color: var(--bg-primary);
}

.search-results {
  display: grid;
  gap: 12px;
}

.search-result-item {
  background-color: var(--bg-secondary);
  padding: 12px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: var(--transition);
}

.search-result-item:hover {
  background-color: var(--bg-tertiary);
  transform: translateX(4px);
}

.search-result-item img {
  width: 50px;
  height: 50px;
  border-radius: 4px;
  object-fit: cover;
}

.empty-state {
  text-align: center;
  color: var(--text-tertiary);
  padding: 60px 24px;
}

/* Library */
.library-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 32px 24px 24px;
}

.library-header h1 {
  font-size: 32px;
  font-weight: 800;
}

.library-actions {
  display: flex;
  gap: 12px;
}

.library-content {
  padding: 0 24px;
}

.playlist-section,
.liked-section {
  margin-bottom: 40px;
}

.playlist-section h3,
.liked-section h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 16px;
}

.playlists-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.playlist-card {
  background-color: var(--bg-secondary);
  border-radius: 8px;
  padding: 16px;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.playlist-card:hover {
  background-color: var(--bg-tertiary);
  transform: translateY(-4px);
}

.playlist-icon {
  font-size: 48px;
  margin-bottom: 12px;
  color: var(--primary-dark);
}

.playlist-name {
  font-weight: 600;
  margin-bottom: 4px;
}

.playlist-count {
  font-size: 12px;
  color: var(--text-secondary);
}

/* Tracks List */
.tracks-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.track-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background-color: var(--bg-secondary);
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
}

.track-row:hover {
  background-color: var(--bg-tertiary);
}

.track-row img {
  width: 40px;
  height: 40px;
  border-radius: 4px;
  object-fit: cover;
}

.track-row-info {
  flex: 1;
}

.track-row-title {
  font-weight: 600;
  color: var(--text-primary);
}

.track-row-artist {
  font-size: 12px;
  color: var(--text-secondary);
}

.track-row-actions {
  display: flex;
  gap: 8px;
}

/* Profile */
.profile-header {
  padding: 60px 24px;
  text-align: center;
  color: white;
}

.profile-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin-bottom: 20px;
  object-fit: cover;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.profile-header h1 {
  font-size: 40px;
  font-weight: 800;
  margin-bottom: 8px;
}

.profile-header p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 16px;
}

.profile-content {
  padding: 32px 24px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}

.stat-card {
  background-color: var(--bg-secondary);
  padding: 20px;
  border-radius: 8px;
  text-align: center;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.profile-section {
  margin-bottom: 40px;
}

.profile-section h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
}

/* Settings */
.settings-container {
  max-width: 600px;
  padding: 32px 24px;
}

.settings-container h1 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 32px;
}

.settings-section {
  background-color: var(--bg-secondary);
  padding: 24px;
  border-radius: 8px;
  margin-bottom: 24px;
}

.settings-section h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--primary-dark);
}

.setting-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.setting-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.setting-item label {
  color: var(--text-primary);
  cursor: pointer;
}

.setting-item input[type="range"] {
  width: 200px;
}

.setting-item select {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: 6px;
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  width: 50px;
  height: 28px;
}

.toggle-switch input {
  display: none;
}

.slider {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--text-tertiary);
  cursor: pointer;
  border-radius: 14px;
  transition: var(--transition);
}

.slider::before {
  position: absolute;
  content: "";
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: white;
  top: 3px;
  left: 3px;
  transition: var(--transition);
}

.toggle-switch input:checked + .slider {
  background-color: var(--primary-dark);
}

.toggle-switch input:checked + .slider::before {
  transform: translateX(22px);
}

/* Responsive */
@media (max-width: 1024px) {
  .main-container {
    margin-left: 0;
  }

  .sidebar {
    transform: translateX(-100%);
    transition: var(--transition);
  }

  .sidebar.active {
    transform: translateX(0);
  }

  .toggle-btn {
    display: block;
  }

  .tracks-grid,
  .discover-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }

  .search-bar {
    min-width: 200px;
  }
}

@media (max-width: 768px) {
  .header-right {
    gap: 12px;
  }

  .search-bar {
    display: none;
  }

  .section {
    margin: 24px 12px;
  }

  .tracks-grid,
  .discover-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 12px;
  }

  .hero-section {
    padding: 40px 16px;
  }

  .hero-content h1 {
    font-size: 32px;
  }

  .section h2 {
    font-size: 20px;
  }

  #player {
    flex-direction: column;
    padding: 12px;
    gap: 12px;
  }

  .player-controls {
    width: 100%;
  }

  .content-wrapper {
    padding-bottom: 140px;
  }
}

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 24px;
  }

  .section h2 {
    font-size: 18px;
  }

  .tracks-grid,
  .discover-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 8px;
  }

  .settings-section {
    padding: 16px;
  }

  .profile-avatar {
    width: 80px;
    height: 80px;
  }

  .profile-header h1 {
    font-size: 28px;
  }
}