/* ============================================
   TRACK GRID, CARDS, COVER, OVERLAY, INFO
   ============================================ */

/* ── Grid ── */
.tracks {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(220px, 100%), 1fr));
    gap: 16px;
}

/* ── Card ── */
.track-card {
    background: rgba(255,255,255,0.025);
    border: 1px solid rgba(255,255,255,0.055);
    border-radius: 16px;
    cursor: pointer;
    transition:
        transform var(--transition-spring),
        box-shadow var(--transition-normal),
        border-color var(--transition-normal),
        background var(--transition-normal);
    position: relative;
    overflow: hidden;
    transform: translateY(16px);
    opacity: 0;
    animation: cardAppear 0.45s ease-out forwards;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
}

@keyframes cardAppear {
    to { transform: translateY(0); opacity: 1; }
}

.track-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(59,130,246,0.8),
        rgba(139,92,246,0.8),
        transparent
    );
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 2;
}

.track-card:hover {
    transform: translateY(-6px);
    background: rgba(255,255,255,0.045);
    border-color: rgba(255,255,255,0.1);
    box-shadow:
        inset 0 1px 0 rgba(255,255,255,0.08),
        0 24px 48px rgba(0,0,0,0.45),
        0 0 80px rgba(59,130,246,0.07);
}

.track-card:hover::before,
.track-card.playing::before { opacity: 1; }

.track-card.playing {
    background: rgba(59,130,246,0.07);
    border-color: rgba(59,130,246,0.28);
    box-shadow:
        inset 0 1px 0 rgba(255,255,255,0.08),
        0 0 0 1px rgba(59,130,246,0.15),
        0 24px 48px rgba(0,0,0,0.4),
        0 0 60px rgba(59,130,246,0.14);
}

/* ── Cover ── */
.track-cover-container {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.track-cover {
    width: 100%;
    height: 190px;
    object-fit: cover;
    object-position: center center;
    display: block;
    transition: transform 0.6s cubic-bezier(0.4,0,0.2,1), filter 0.3s ease;
}

.track-card:hover .track-cover {
    transform: scale(1.07);
    filter: brightness(0.85);
}

.track-cover-placeholder {
    width: 100%;
    height: 190px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    position: relative;
    flex-shrink: 0;
}

.track-cover-placeholder svg {
    width: 64px; height: 64px;
    color: rgba(255,255,255,0.75);
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.3));
}

/* Genre-specific cover gradients */
.track-cover-placeholder[data-genre="electronic"] { background: linear-gradient(135deg, #3B82F6, #06B6D4); }
.track-cover-placeholder[data-genre="rock"]        { background: linear-gradient(135deg, #F59E0B, #EC4899); }
.track-cover-placeholder[data-genre="hip-hop"]     { background: linear-gradient(135deg, #8B5CF6, #EC4899); }
.track-cover-placeholder[data-genre="jazz"]        { background: linear-gradient(135deg, #10B981, #3B82F6); }
.track-cover-placeholder[data-genre="pop"]         { background: linear-gradient(135deg, #EC4899, #8B5CF6); }
.track-cover-placeholder[data-genre="ambient"]     { background: linear-gradient(135deg, #06B6D4, #10B981); }
.track-cover-placeholder[data-genre="classical"]   { background: linear-gradient(135deg, #8B5CF6, #3B82F6); }
.track-cover-placeholder[data-genre="other"]       { background: linear-gradient(135deg, #3B82F6, #8B5CF6); }

/* ── Overlay ── */
.track-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.65) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
    backdrop-filter: blur(2px);
    gap: 16px;
}

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

/* Play Button */
.track-play-btn {
    background: rgba(255,255,255,0.1);
    border: 2px solid rgba(255,255,255,0.85);
    border-radius: 50%;
    width: 66px; height: 66px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: all var(--transition-spring);
    backdrop-filter: blur(12px);
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.track-play-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-normal);
    border-radius: 50%;
}

.track-play-btn:hover {
    transform: scale(1.12);
    border-color: white;
    box-shadow: 0 0 24px rgba(255,255,255,0.25);
}

.track-play-btn:hover::before { opacity: 1; }

.track-play-btn svg {
    width: 26px; height: 26px;
    color: white;
    position: relative;
    z-index: 1;
    margin-left: 3px;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

/* Share Button */
.share-btn {
    background: rgba(0,0,0,0.2);
    border: 2px solid rgba(255,255,255,0.6);
    border-radius: 50%;
    width: 46px; height: 46px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: all var(--transition-spring);
    backdrop-filter: blur(12px);
    overflow: hidden;
    position: relative;
    flex-shrink: 0;
}

.share-btn::before {
    content: '';
    position: absolute; inset: 0;
    background: var(--gradient-tertiary);
    opacity: 0;
    transition: opacity var(--transition-normal);
    border-radius: 50%;
}

.share-btn svg {
    width: 18px; height: 18px;
    color: white;
    position: relative; z-index: 1;
}

.share-btn:hover {
    transform: scale(1.12);
    border-color: white;
    box-shadow: 0 0 20px rgba(16,185,129,0.35);
}

.share-btn:hover::before { opacity: 1; }

/* Add to Playlist Button */
.add-to-playlist-btn {
    background: rgba(0,0,0,0.2);
    border: 2px solid rgba(255,255,255,0.6);
    border-radius: 50%;
    width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: all var(--transition-spring);
    backdrop-filter: blur(12px);
    color: white;
    flex-shrink: 0;
}

.add-to-playlist-btn:hover {
    transform: scale(1.12);
    border-color: white;
    background: var(--gradient-primary);
    box-shadow: 0 0 20px rgba(59,130,246,0.4);
}

/* ── Track Info ── */
.track-info { padding: 16px 18px 18px; }

.track-title {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 3px;
    color: var(--text);
    letter-spacing: -0.01em;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.track-artist {
    color: var(--text-dark);
    font-size: 0.77rem;
    margin-bottom: 12px;
    font-weight: 500;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.track-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.track-genre {
    background: rgba(255,255,255,0.06);
    color: var(--text-muted);
    padding: 3px 9px;
    border-radius: 100px;
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border: 1px solid rgba(255,255,255,0.07);
}

.track-duration {
    font-size: 0.72rem;
    color: var(--text-dark);
    font-variant-numeric: tabular-nums;
}

.track-stats {
    display: flex;
    align-items: center;
    gap: 10px;
}

.play-count, .listen-count, .rating {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.7rem;
    color: var(--text-dark);
    font-weight: 500;
}

.play-count svg, .listen-count svg { width: 11px; height: 11px; }
.rating svg { width: 11px; height: 11px; color: #F59E0B; }

/* ── Live Listening Indicator ── */
.track-card.listening::after {
    content: '';
    position: absolute;
    top: 12px; right: 12px;
    width: 9px; height: 9px;
    background: var(--green);
    border-radius: 50%;
    z-index: 10;
    box-shadow: 0 0 0 0 rgba(16,185,129,0.5);
    animation: livePulse 1.8s ease-in-out infinite;
}