:root {
    --bg: #050505;
    --text: #ffffff;
    --text-muted: #666;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: radial-gradient(circle at center, #111 0%, var(--bg) 100%);
}
#app {
    position: relative;
    width: 100%;
    max-width: 1000px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 3vw;
    width: 80vw;
    max-width: 800px;
    aspect-ratio: 1; /* Keep it square */
    position: relative;
    z-index: 2;
}
.cell {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}
.album {
    width: 100%;
    height: 100%;
    cursor: pointer;
    perspective: 1000px;
    transform-style: preserve-3d;
    will-change: transform;
    transition: transform 0.1s ease-out;
    z-index: 10;
}
.album-art {
    width: 100%;
    height: 100%;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 40px rgba(0,0,0,0.6);
    border: 1px solid rgba(255,255,255,0.05);
    pointer-events: none; 
    transition: box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-color: #111; 
}
.album:hover .album-art {
    box-shadow: 0 20px 50px rgba(0,0,0,0.8), 0 0 30px rgba(255,255,255,0.05);
}
.glare {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    opacity: 0;
    transition: opacity 0.5s ease;
    pointer-events: none;
    z-index: 1;
    mix-blend-mode: overlay;
}

/* Player layout styles */
.player-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80vw;
    max-width: 800px;
    height: 80vw;
    max-height: 800px;
    display: flex;
    align-items: center;
    pointer-events: none;
    z-index: 1;
}
.tracklist-wrapper {
    margin-left: calc(33.333% + 3vw);
    width: calc(66.666% - 3vw);
    opacity: 0;
    transform: translateX(20px);
    transition: all 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    display: flex;
    flex-direction: column;
    max-height: 100%;
}
.back-btn {
    position: absolute;
    top: -60px; 
    left: 0;
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.3s ease, color 0.2s;
    pointer-events: none;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.back-btn:hover { color: var(--text); }
h2 { margin-bottom: 1.5rem; font-weight: 300; font-size: 3rem; letter-spacing: -1px; flex-shrink: 0; }
.tracklist { 
    list-style: none; 
    overflow-y: auto; 
    padding-right: 10px;
    scrollbar-width: thin;
    scrollbar-color: #333 transparent;
}
.tracklist::-webkit-scrollbar {
    width: 6px;
}
.tracklist::-webkit-scrollbar-thumb {
    background-color: #333;
    border-radius: 10px;
}
.tracklist li {
    display: flex;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.2s;
}
.tracklist li:hover { color: var(--text); transform: translateX(5px); }
.tracklist li.playing-track { color: var(--text); font-weight: 600; }
.track-num { width: 40px; font-size: 1rem; font-weight: 300; }
.track-name { flex-grow: 1; font-weight: 400; font-size: 1.1rem; }
.play-btn { font-size: 1.2rem; opacity: 0; transition: opacity 0.2s; color: #fff; }
.tracklist li:hover .play-btn, .tracklist li.playing-track .play-btn { opacity: 1; }

/* State: Player Active */
body.player-active .cell:not(.selected-cell) .album {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}
body.player-active .player-container {
    pointer-events: auto;
    z-index: 10;
}
body.player-active .tracklist-wrapper {
    opacity: 1;
    transform: translateX(0);
    transition-delay: 0.3s;
}
body.player-active .back-btn {
    opacity: 1;
    pointer-events: auto;
    transition-delay: 0.5s;
}
.cell.selected-cell { z-index: 100; }

/* Progress Bar */
.progress-container {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 2rem;
    background: rgba(5, 5, 5, 0.9);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255,255,255,0.05);
    display: flex;
    align-items: center;
    gap: 1rem;
    z-index: 50;
    transform: translateY(100%);
    transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}
body.player-active .progress-container {
    transform: translateY(0);
}
.progress-bar-wrapper {
    flex-grow: 1;
    height: 6px;
    background: rgba(255,255,255,0.1);
    border-radius: 3px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: #fff;
    border-radius: 3px;
    pointer-events: none;
}
#current-time, #duration {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
    width: 40px;
    text-align: center;
}