body {
    font-family: 'Sora', sans-serif; /* New Font */
    background-color: #000000;
    color: #ffffff;
    overflow: hidden;
}
.app-container {
    display: grid;
    grid-template-columns: 250px 1fr;
    height: 100vh;
}
.sidebar {
    background-color: rgba(10, 10, 10, 0.8); /* Darker Sidebar */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}
.nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    margin: 0.25rem 0;
    border-radius: 0.25rem;
    color: #b3b3b3;
    font-weight: 600;
    transition: all 0.2s ease;
}
.nav-link:hover {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.1);
}
.nav-link.active {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.15);
}
.main-content {
    background: linear-gradient(to bottom, #2a0a4a, #121212 400px); /* Refined Gradient */
    overflow-y: auto;
    padding-bottom: 120px;
}
/* --- Custom Scrollbar --- */
.main-content::-webkit-scrollbar {
    width: 12px;
}
.main-content::-webkit-scrollbar-track {
    background: transparent;
}
.main-content::-webkit-scrollbar-thumb {
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    border: 3px solid #121212;
}
.search-bar:focus {
    box-shadow: 0 0 0 2px #ffffff;
    outline: none;
}
.filter-btn {
    padding: 0.5rem 1.25rem;
    border-radius: 9999px;
    font-weight: 600; /* Bolder font */
    background-color: rgba(0, 0, 0, 0.3);
    color: #ffffff;
    transition: all 0.2s ease;
}
.filter-btn:hover {
    background-color: rgba(0, 0, 0, 0.5);
}
.filter-btn.active {
    background-color: #ffffff;
    color: #000000;
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.3); /* Subtle Glow */
}
.result-card {
    background-color: rgba(255, 255, 255, 0.05);
    padding: 1rem;
    border-radius: 0.5rem;
    transition: background-color 0.2s ease-in-out, transform 0.2s ease-in-out;
    opacity: 0;
}
.result-card:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}
.track-row {
    display: grid;
    grid-template-columns: 2rem 1fr;
    gap: 1rem;
    align-items: center;
    padding: 0.5rem;
    border-radius: 0.25rem;
    transition: background-color 0.2s ease, transform 0.2s ease;
    opacity: 0;
}
.track-row:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateX(4px);
}
.track-row .track-number {
    transition: color 0.2s ease, transform 0.2s ease;
}
.track-row:hover .track-number {
    color: #1DB954; /* Spotify Green on hover */
    transform: scale(1.1);
}
.track-row-content {
    display: grid;
    grid-template-columns: minmax(0, 4fr) minmax(0, 2fr) minmax(0, 50px);
    gap: 1rem;
    align-items: center;
}
.mini-player {
    background-color: rgba(18, 18, 18, 0.8); /* Darker Player */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateY(100%);
    z-index: 100;
}
.mini-player.visible {
    transform: translateY(0);
}
#mini-player-progress-bar-container {
    height: 2px; /* Thicker Progress Bar */
}
.now-playing-canvas {
    background-color: rgba(0,0,0,0.5);
    backdrop-filter: blur(50px);
    -webkit-backdrop-filter: blur(50px);
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    visibility: hidden;
}
.now-playing-canvas.visible {
    opacity: 1;
    visibility: visible;
}
#now-playing-bg {
    transition: opacity 0.5s ease;
    opacity: 0.2;
    filter: blur(40px);
    transform: scale(1.2);
}
.back-btn {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 9999px;
    padding: 0.5rem 1rem;
    transition: background-color 0.2s ease;
}
.back-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
}
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse { 50% { opacity: .5; } }
.skeleton { animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite; }

/* --- Responsive Styles --- */
@media (max-width: 768px) {
    .app-container {
        grid-template-columns: 1fr;
    }
    .sidebar {
        display: none;
    }
    /* Mobile track list layout fix */
    .track-row-content {
        grid-template-columns: minmax(0, 1fr) auto;
    }
    .track-album-name {
        display: none;
    }
}