:root {
    --bg-color: #121212;
    --card-color: #1e1e1e;
    --text-color: #ffffff;
    --accent-color: #1db954; /* Spotify green aesthetic */
    --hover-color: #2a2a2a;
    --control-size: 44px;
    --large-control-size: 60px;
}

body {
    font-family: Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    min-height: 100vh;
    box-sizing: border-box;
}

#player-container {
    width: 100%;
    max-width: 400px;
    background-color: var(--card-color);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

h1 {
    font-size: 1.5em;
    margin: 0;
}

h2 {
    font-size: 1.2em;
    margin-top: 20px;
    margin-bottom: 10px;
    border-bottom: 1px solid var(--hover-color);
    padding-bottom: 5px;
}

.add-music-btn {
    background-color: var(--accent-color);
    color: var(--bg-color);
    padding: 8px 15px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.2s;
    font-size: 0.9em;
}

.add-music-btn:hover {
    background-color: #1ed760;
}

/* Track Info */
#current-track-info {
    text-align: center;
    margin-bottom: 20px;
    padding: 10px;
    background-color: var(--bg-color);
    border-radius: 8px;
}

#track-title {
    display: block;
    font-size: 1.1em;
    font-weight: bold;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 5px;
}

#progress-bar-container {
    height: 6px;
    background-color: #444;
    border-radius: 3px;
    margin-top: 10px;
    cursor: pointer;
}

#progress-bar {
    height: 100%;
    width: 0%;
    background-color: var(--accent-color);
    border-radius: 3px;
    transition: width 0.1s linear;
}

/* Controls */
#controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-top: 20px;
}

.control-btn {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 1.5em;
    width: var(--control-size);
    height: var(--control-size);
    border-radius: 50%;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn:hover {
    background-color: var(--hover-color);
}

.control-btn.large {
    font-size: 2em;
    width: var(--large-control-size);
    height: var(--large-control-size);
    border: 2px solid var(--text-color);
    line-height: var(--large-control-size);
}

.control-btn.large:hover {
    background-color: var(--hover-color);
}

/* Active states for toggle buttons */
#shuffle-btn[data-state="on"],
#loop-btn[data-state="playlist"],
#loop-btn[data-state="single"] {
    color: var(--accent-color);
    background-color: #333;
}
#shuffle-btn[data-state="on"]:hover,
#loop-btn[data-state="playlist"]:hover,
#loop-btn[data-state="single"]:hover {
    background-color: #444;
}

/* Playlist */
#playlist {
    list-style: none;
    padding: 0;
    max-height: 300px; /* Limit height for better mobile fit */
    overflow-y: auto;
    background-color: var(--bg-color);
    border-radius: 8px;
}

.playlist-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    border-bottom: 1px solid #333;
    cursor: pointer;
    transition: background-color 0.2s;
    font-size: 0.9em;
}

.playlist-item:last-child {
    border-bottom: none;
}

.playlist-item:hover {
    background-color: var(--hover-color);
}

.playlist-item.active {
    background-color: rgba(29, 185, 84, 0.2); /* Transparent accent color */
    font-weight: bold;
}

.playlist-item-name {
    flex-grow: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.empty-list-msg {
    padding: 20px;
    text-align: center;
    color: #aaa;
}