:root {
    --bg-primary: #000000;
    --bg-secondary: #121212;
    --bg-card: #181818;
    --bg-hover: #282828;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --accent-color: #1ed760;
    --accent-hover: #1fdf64;
    --sidebar-width: 240px;
    --player-height: 90px;
}

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

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

.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    padding: 24px 12px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    overflow-y: auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 12px;
    margin-bottom: 18px;
}

.logo .material-icons {
    font-size: 32px;
    color: var(--accent-color);
}

.logo h2 {
    font-size: 20px;
    font-weight: 700;
}

.main-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.3s;
}

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

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

.nav-item .material-icons {
    font-size: 24px;
}

.playlists-nav {
    flex: 1;
}

.playlists-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
}

#playlists-list {
    margin-top: 12px;
}

.create-playlist {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 12px;
    margin-top: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.3s;
}

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

/* Main Content */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    background: var(--bg-primary);
}

/* Cards */
.music-grid, .artist-grid, .album-grid, .playlist-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 24px;
    margin-top: 20px;
}

.music-card, .artist-card, .album-card, .playlist-card {
    background: var(--bg-card);
    padding: 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
}

.music-card:hover, .artist-card:hover, .album-card:hover, .playlist-card:hover {
    background: var(--bg-hover);
    transform: translateY(-4px);
}

.music-card img, .artist-card img, .album-card img, .playlist-card img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 16px;
}

.artist-card img {
    border-radius: 50%;
}

.music-card h4, .artist-card h4, .album-card h4, .playlist-card h4 {
    font-size: 16px;
    margin-bottom: 4px;
}

.music-card p, .artist-card p, .album-card p, .playlist-card p {
    font-size: 14px;
    color: var(--text-secondary);
}

.play-music-btn {
    position: absolute;
    bottom: 80px;
    right: 20px;
    background: var(--accent-color);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    opacity: 0;
    transition: all 0.3s;
    transform: translateY(8px);
}

.music-card:hover .play-music-btn {
    opacity: 1;
    transform: translateY(0);
}

.play-music-btn .material-icons {
    font-size: 24px;
    color: #000;
}

/* Global Player */
.global-player {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--player-height);
    background: var(--bg-secondary);
    border-top: 1px solid #282828;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    z-index: 1000;
}

.player-info {
    display: flex;
    align-items: center;
    gap: 16px;
    min-width: 180px;
}

.player-info img {
    width: 56px;
    height: 56px;
    object-fit: cover;
    border-radius: 4px;
}

.player-track-info {
    display: flex;
    flex-direction: column;
}

.player-track-info span:first-child {
    font-size: 14px;
    font-weight: 500;
}

.player-track-info span:last-child {
    font-size: 12px;
    color: var(--text-secondary);
}

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

.control-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s;
}

.control-btn:hover {
    color: var(--text-primary);
    transform: scale(1.05);
}

.play-btn {
    background: var(--text-primary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.play-btn .material-icons {
    color: #000;
    font-size: 20px;
}

.player-progress {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 300px;
}

.progress-bar {
    flex: 1;
    height: 4px;
    background: #535353;
    border-radius: 2px;
    cursor: pointer;
    position: relative;
}

.progress-fill {
    width: 0;
    height: 100%;
    background: var(--accent-color);
    border-radius: 2px;
    position: relative;
}

#current-time, #total-time {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Artist Page */
.artist-header {
    margin-bottom: 32px;
}

.artist-cover {
    position: relative;
    height: 300px;
    overflow: hidden;
    border-radius: 8px;
}

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

.artist-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 32px;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
}

.artist-overlay h1 {
    font-size: 48px;
    margin-bottom: 16px;
}

.artist-bio {
    margin-top: 16px;
    color: var(--text-secondary);
}

.artist-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
}

.btn-follow {
    background: transparent;
    border: 1px solid var(--text-secondary);
    color: var(--text-secondary);
    padding: 8px 24px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
}

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

.btn-follow.following {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #000;
}

.btn-play-all {
    background: var(--accent-color);
    border: none;
    color: #000;
    padding: 12px 32px;
    border-radius: 24px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s;
}

.btn-play-all:hover {
    background: var(--accent-hover);
    transform: scale(1.02);
}

/* Music List */
.music-list {
    margin-top: 24px;
}

.music-list-item, .table-row, .history-item {
    display: grid;
    grid-template-columns: 50px 1fr 80px 50px;
    align-items: center;
    padding: 12px 16px;
    border-radius: 8px;
    transition: background 0.3s;
}

.table-header {
    display: grid;
    grid-template-columns: 50px 2fr 1fr 80px 50px;
    padding: 12px 16px;
    color: var(--text-secondary);
    font-size: 14px;
    border-bottom: 1px solid #282828;
}

.music-list-item:hover, .table-row:hover, .history-item:hover {
    background: var(--bg-hover);
}

.music-number {
    color: var(--text-secondary);
}

/* Search Page */
.search-header {
    margin-bottom: 32px;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border-radius: 40px;
    padding: 12px 24px;
    max-width: 600px;
    margin: 0 auto;
}

.search-box .material-icons {
    color: var(--text-secondary);
    margin-right: 12px;
}

.search-box input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    outline: none;
}

.search-box input::placeholder {
    color: var(--text-secondary);
}

.search-section {
    margin-bottom: 48px;
}

.search-section h2 {
    margin-bottom: 20px;
}

/* Library Page */
.library-tabs {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    border-bottom: 1px solid #282828;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 12px 24px;
    cursor: pointer;
    font-size: 16px;
    position: relative;
    transition: all 0.3s;
}

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

.tab-btn.active {
    color: var(--text-primary);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-color);
}

.tab-content {
    display: none;
}

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

/* History */
.history-item {
    grid-template-columns: 50px 60px 1fr 150px 50px;
}

.history-cover {
    width: 50px;
    height: 50px;
    object-fit: cover;
    border-radius: 4px;
}

.history-date {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Buttons */
.btn-primary {
    background: var(--accent-color);
    color: #000;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 600;
    cursor: pointer;
}

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

/* Loading */
.loading {
    text-align: center;
    padding: 48px;
    color: var(--text-secondary);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: #535353;
}

::-webkit-scrollbar-thumb:hover {
    background: #7f7f7f;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 70px;
        padding: 24px 8px;
    }
    
    .logo h2, .nav-item span:last-child, .playlists-nav, .auth-buttons span, .user-info span {
        display: none;
    }
    
    .music-grid, .artist-grid, .album-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}