:root {
    --bg-main: #000000;
    --bg-sidebar: #000000;
    --bg-surface: #121212;
    --bg-surface-hover: #1f1f1f;
    --bg-player: #181818;
    --text-primary: #ffffff;
    --text-secondary: #a7a7a7;
    --accent: #1db954; 
    --accent-hover: #1ed760;
    --divider: #282828;
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    overflow: hidden;
    user-select: none;
}

.app-container {
    display: flex;
    height: calc(100vh - 90px); 
}

/* Sidebar */
.sidebar {
    width: 260px; background-color: var(--bg-sidebar);
    padding: 24px; display: flex; flex-direction: column;
}
.logo {
    display: flex; align-items: center; gap: 12px; font-size: 24px;
    font-weight: 800; margin-bottom: 32px; color: var(--text-primary);
}
.logo ion-icon { color: var(--accent); }

.nav-links { display: flex; flex-direction: column; gap: 16px; }
.nav-links a {
    text-decoration: none; color: var(--text-secondary);
    font-weight: 600; font-size: 14px;
    display: flex; align-items: center; gap: 16px; transition: color 0.2s;
}
.nav-links a ion-icon { font-size: 24px; }
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); }

/* Main Content */
.main-content {
    flex: 1;
    background: linear-gradient(180deg, #1f1f1f 0%, #121212 300px);
    background-color: var(--bg-surface);
    border-radius: 8px 0 0 0;
    overflow-y: auto; position: relative; padding-bottom: 60px;
}

.hidden { display: none !important; }

/* Topbar */
.topbar {
    display: flex; justify-content: space-between; align-items: center;
    padding: 16px 32px; position: sticky; top: 0;
    background: rgba(18, 18, 18, 0.8); backdrop-filter: blur(20px); z-index: 10;
}
.nav-buttons .nav-btn {
    background: rgba(0,0,0,0.5); border: none; border-radius: 50%;
    width: 32px; height: 32px; color: var(--text-primary);
    cursor: pointer; display: flex; align-items: center; justify-content: center; margin-right: 16px;
}
.search-container {
    display: flex; align-items: center; background: #242424; border-radius: 500px;
    padding: 10px 16px; max-width: 400px; width: 100%;
}
.search-container input {
    background: transparent; border: none; color: white;
    font-size: 14px; font-family: inherit; margin-left: 8px; flex: 1; outline: none;
}
.search-container input::placeholder { color: var(--text-secondary); }
#searchButton { display: none; }

/* Views */
.view-section { padding: 0 32px; }
.section-title { font-size: 24px; font-weight: 700; margin: 24px 0; color: var(--text-primary); letter-spacing:-0.4px; }

/* Horizontal Scroll Row */
.horizontal-scroll {
    display: flex; gap: 24px; overflow-x: auto;
    padding-bottom: 16px; scroll-behavior: smooth;
    -ms-overflow-style: none; scrollbar-width: none;
}
.horizontal-scroll::-webkit-scrollbar { display: none; }

.scroll-arrows button {
    background: transparent; border: none; color: var(--text-secondary);
    font-size: 24px; cursor: pointer; padding: 4px; border-radius: 50%; transition: 0.2s;
}
.scroll-arrows button:hover { color: white; background: rgba(255,255,255,0.1); }

/* Loader */
.spinner {
    width: 32px; height: 32px; border: 3px solid var(--divider);
    border-top: 3px solid var(--accent); border-radius: 50%;
    animation: spin 1s linear infinite; margin: 40px auto;
}
@keyframes spin { 100% { transform: rotate(360deg); } }

/* Grid Cards */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 24px; }
.card {
    background-color: var(--bg-card); padding: 16px; border-radius: 8px;
    cursor: pointer; transition: background-color 0.3s;
    min-width: 160px; /* needed for horizontal scroll */
}
.card:hover { background-color: var(--bg-surface-hover); }
.card img {
    width: 100%; aspect-ratio: 1/1; object-fit: cover;
    border-radius: 50%; margin-bottom: 16px; box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}
.card-title { font-size: 16px; font-weight: 700; margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; text-align: center; }
.card-desc { font-size: 14px; color: var(--text-secondary); text-align: center; }

/* Playlist Detail View */
.playlist-header {
    display: flex; gap: 24px; align-items: flex-end; padding: 32px 0; border-bottom: 1px solid var(--divider);
}
.playlist-header img {
    width: 232px; height: 232px; object-fit: cover;
    box-shadow: 0 4px 60px rgba(0,0,0,0.5); border-radius: 4px;
}
.playlist-info h5 { font-size: 12px; font-weight: 700; color: var(--text-secondary); margin-bottom: 8px; }
.playlist-info h1 { font-size: 72px; font-weight: 900; letter-spacing: -2px; margin-bottom: 16px; line-height: 1; }
.playlist-info p { color: var(--text-secondary); font-size: 14px; margin-bottom: 24px; }
.btn-play-all {
    background: var(--accent); color: #000; border: none; border-radius: 500px;
    padding: 14px 32px; font-size: 14px; font-weight: 700; display: inline-flex; align-items: center; cursor: pointer; transition: transform 0.1s;
}
.btn-play-all:hover { transform: scale(1.04); background: var(--accent-hover); }

.track-list { margin-top: 24px; }
.track-list-header {
    display: grid; grid-template-columns: 40px 1fr 1fr 60px;
    color: var(--text-secondary); font-size: 13px; font-weight: 500;
    padding: 8px 16px; border-bottom: 1px solid var(--divider);
}
.track-row {
    display: grid; grid-template-columns: 40px 1fr 1fr 60px;
    align-items: center; padding: 12px 16px; border-radius: 4px; cursor: pointer; transition: background 0.2s; color: var(--text-secondary);
}
.track-row:hover { background-color: rgba(255,255,255,0.1); color: var(--text-primary); }
.track-row .row-num { font-size: 14px; position:relative;}
.track-row .row-play-icon { display: none; position:absolute; left:0; font-size: 18px; color:var(--text-primary);}
.track-row:hover .row-num span { display: none; }
.track-row:hover .row-play-icon { display: block; }

.track-row .row-title { font-size: 15px; font-weight: 500; color: var(--text-primary); }
.track-row .row-artist { font-size: 13px; }

/* Player Bar */
.player-bar {
    height: 90px; background-color: var(--bg-player);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 16px; box-sizing: border-box;
    transition: transform 0.3s ease-in-out;
}
.player-bar.hidden {
    transform: translateY(100%);
    display: flex !important; /* overrides standard .hidden */
}

.now-playing { display: flex; align-items: center; width: 30%; gap: 14px; }
.thumb-container { position: relative; height: 56px; width: 56px; }
.thumb-container img { height: 100%; width: 100%; border-radius: 4px; object-fit: cover; z-index: 2; position: relative; }

/* Sparkle Animation */
.sparkle-ring {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    border-radius: 4px; border: 2px solid var(--accent); opacity: 0; z-index: 1;
}
.thumb-container.playing .ring-1 {
    width: 100%; height: 100%; animation: subtle-pulse 2s infinite ease-out;
}
@keyframes subtle-pulse {
    0% { transform: translate(-50%, -50%) scale(1); opacity: 0.8; }
    100% { transform: translate(-50%, -50%) scale(1.15); opacity: 0; }
}

.track-info { display: flex; flex-direction: column; justify-content: center; }
.track-info .track-name { font-size: 14px; font-weight: 600; white-space: nowrap;}
.track-info .track-artist { font-size: 12px; color: var(--text-secondary); white-space: nowrap;}

.player-controls { display: flex; flex-direction: column; align-items: center; width: 40%; max-width: 722px; }
.controls-buttons { display: flex; gap: 24px; align-items: center; margin-bottom: 8px; }
.ctrl-btn { background: none; border: none; color: var(--text-primary); font-size: 20px; cursor: pointer; transition: color 0.1s, transform 0.1s; display: flex; align-items: center; justify-content: center;}
.subtext-color { color: var(--text-secondary); }
.subtext-color:hover { color: var(--text-primary); }
.active-icon { color: var(--accent) !important; }

.play-btn { background: white; color: black; height: 32px; width: 32px; border-radius: 50%; font-size: 18px; transition: transform 0.1s; }
.play-btn:hover { transform: scale(1.06); }

/* Native Progress Bar styling */
.progress-bar-container { display: flex; align-items: center; width: 100%; gap: 8px; font-size: 11px; color: var(--text-secondary); }

.progress-bar-bg {
    position: relative; width: 100%; height: 4px; background: #4d4d4d; border-radius: 2px;
    cursor: pointer; flex: 1; display:flex; align-items:center;
}
.progress-bar-bg:hover .progress-bar-fill { background: var(--accent-hover); }
.progress-bar-bg:hover .progress-bar-fill::after { display: block; }

.progress-bar-fill {
    width: 0%; height: 100%; background: var(--text-primary); border-radius: 2px; pointer-events: none;
    position: relative;
}
.progress-bar-fill::after {
    content: ''; position: absolute; right: -4px; top: -4px;
    width: 12px; height: 12px; background: white; border-radius: 50%;
    display: none; box-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.player-options { display: flex; align-items: center; justify-content: flex-end; width: 30%; gap: 16px; }

#btnBoost.active-boost { color: var(--bg-main) !important; background: var(--accent) !important; border-color: var(--accent) !important; }