:root {
    --spotify-black: #121212;
    --spotify-dark-gray: #181818;
    --spotify-gray: #282828;
    --spotify-light-gray: #b3b3b3;
    --spotify-white: #ffffff;
    --spotify-green: #1db954;
}

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

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background-color: var(--spotify-black);
    color: var(--spotify-white);
    height: 100vh;
    overflow: hidden;
}

.container {
    display: grid;
    grid-template-areas:
        'sidebar main-content'
        'player player';
    grid-template-columns: 250px 1fr;
    grid-template-rows: 1fr auto;
    height: 100vh;
}

.sidebar {
    grid-area: sidebar;
    background-color: #000;
    padding: 1.5rem;
    transition: transform 0.3s ease-in-out;
}
.sidebar nav ul { list-style: none; }
.sidebar nav ul li a {
    color: var(--spotify-light-gray);
    text-decoration: none;
    font-weight: 600;
    padding: 0.8rem 0;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: color 0.2s ease;
}
.sidebar nav ul li a:hover { color: var(--spotify-white); }

.main-content {
    grid-area: main-content;
    background: linear-gradient(var(--spotify-gray), var(--spotify-black) 80%);
    padding: 2rem;
    overflow-y: auto;
}
.main-content header {
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}
#menu-button {
    display: none;
    background: none;
    border: none;
    color: var(--spotify-white);
    font-size: 1.5rem;
    cursor: pointer;
}
#search-form { display: flex; flex-grow: 1; }
#search-input {
    flex-grow: 1;
    padding: 0.8rem;
    border-radius: 25px 0 0 25px;
    border: none;
    font-size: 1rem;
    background-color: var(--spotify-gray);
    color: var(--spotify-white);
}
#search-input:focus { outline: 2px solid var(--spotify-white); }
#search-form button {
    padding: 0.8rem 1rem;
    border-radius: 0 25px 25px 0;
    border: none;
    background-color: var(--spotify-green);
    color: var(--spotify-white);
    font-weight: 600;
    cursor: pointer;
    flex-shrink: 0; 
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.5rem;
}
.track-card {
    background-color: var(--spotify-dark-gray);
    padding: 1rem;
    border-radius: 8px;
    transition: background-color 0.2s ease;
    position: relative;
}
.track-card:hover { background-color: var(--spotify-gray); }
.track-card img {
    width: 100%;
    border-radius: 4px;
    margin-bottom: 0.8rem;
    cursor: pointer;
}
.track-card .track-name {
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color 0.2s ease;
    cursor: pointer;
}
.track-card .artist-name {
    color: var(--spotify-light-gray);
    font-size: 0.9rem;
    cursor: pointer;
}

.track-card.playing .track-name { color: var(--spotify-green); }

.playing-indicator {
    position: absolute;
    top: 55%;
    right: 1.5rem;
    font-size: 1.2rem;
    color: var(--spotify-green);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}
.track-card.playing .playing-indicator { opacity: 1; }

.player {
    grid-area: player;
    background-color: var(--spotify-dark-gray);
    border-top: 1px solid var(--spotify-gray);
    height: 90px;
    display: grid;
    grid-template-columns: 300px 1fr 300px;
    align-items: center;
    padding: 0 1.5rem;
}
.track-info { display: flex; align-items: center; gap: 1rem; }
.track-info img { width: 56px; height: 56px; }
.track-details { display: flex; flex-direction: column; }
#player-track-title { font-weight: 600; }
#player-artist-name { font-size: 0.8rem; color: var(--spotify-light-gray); }

.player-controls-container { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.player-controls { display: flex; justify-content: center; align-items: center; gap: 1.5rem; }
.player-controls button { background: none; border: none; color: var(--spotify-light-gray); font-size: 1.2rem; cursor: pointer; transition: all 0.2s ease; }
.player-controls button:hover { color: var(--spotify-white); }
#play-pause-button { font-size: 2.2rem; color: var(--spotify-white); }
#play-pause-button:hover { transform: scale(1.05); }

.progress-bar-container { display: flex; align-items: center; gap: 0.5rem; width: 100%; }
#progress-bar { width: 100%; height: 4px; background-color: var(--spotify-gray); border-radius: 2px; cursor: pointer; }
#progress { height: 100%; width: 0; background-color: var(--spotify-white); border-radius: 2px; transition: background-color 0.2s ease; }
#progress-bar:hover #progress { background-color: var(--spotify-green); }
#current-time, #total-duration { font-size: 0.8rem; color: var(--spotify-light-gray); }

.favorite-btn { background: none; border: none; color: var(--spotify-light-gray); font-size: 1rem; cursor: pointer; transition: color 0.2s ease; }
.favorite-btn:hover { color: var(--spotify-white); }
.favorite-btn.favorited { color: var(--spotify-green); }

.options-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--spotify-light-gray);
    font-size: 1rem;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s ease;
}
.track-card:hover .options-btn { opacity: 1; }
.context-menu {
    position: absolute;
    background-color: var(--spotify-gray);
    border-radius: 4px;
    padding: 0.5rem;
    box-shadow: 0 4px 8px rgba(0,0,0,0.5);
    z-index: 10;
}
.context-menu button {
    background: none;
    border: none;
    color: var(--spotify-white);
    padding: 0.5rem 1rem;
    width: 100%;
    text-align: left;
    cursor: pointer;
}
.context-menu button:hover { background-color: #404040; }


.volume-controls { display: flex; align-items: center; gap: 0.5rem; justify-self: end; }
.volume-controls button { background: none; border: none; color: var(--spotify-light-gray); font-size: 1rem; cursor: pointer; }
#volume-slider { -webkit-appearance: none; width: 100px; height: 4px; background: var(--spotify-gray); border-radius: 2px; outline: none; transition: opacity 0.2s; }
#volume-slider::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 12px; height: 12px; background: var(--spotify-white); cursor: pointer; border-radius: 50%; }

.skeleton-card { background-color: var(--spotify-gray); padding: 1rem; border-radius: 8px; animation: pulse 1.5s infinite ease-in-out; }
.skeleton-image { width: 100%; padding-bottom: 100%; border-radius: 4px; margin-bottom: 0.8rem; background-color: var(--spotify-light-gray); }
.skeleton-text { height: 1.2em; background-color: var(--spotify-light-gray); border-radius: 4px; margin-bottom: 0.5rem; }
.skeleton-text-artist { width: 60%; height: 1em; }
@keyframes pulse { 0% { opacity: 0.4; } 50% { opacity: 0.7; } 100% { opacity: 0.4; } }

#toast-container { position: fixed; bottom: 100px; right: 20px; z-index: 1000; }
.toast { background-color: var(--spotify-green); color: var(--spotify-white); padding: 1rem 1.5rem; border-radius: 8px; margin-bottom: 0.5rem; font-weight: 600; animation: toast-in 0.5s ease, toast-out 0.5s ease 2.5s forwards; }
@keyframes toast-in { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes toast-out { from { transform: translateX(0); opacity: 1; } to { transform: translateX(100%); opacity: 0; } }

@media (max-width: 768px) {
    .container {
        grid-template-areas: 'main-content' 'player';
        grid-template-columns: 1fr;
    }
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100%;
        width: 250px;
        transform: translateX(-100%);
        z-index: 100;
    }
    .sidebar.active { transform: translateX(0); }
    #menu-button { display: block; }
    .main-content header { flex-wrap: wrap; }
    #search-form { width: 100%; margin-top: 1rem; }
    
    .player {
        grid-template-columns: 1fr 1fr;
        grid-template-areas: 'info volume' 'controls controls';
        height: auto;
        padding: 1rem;
        gap: 1rem;
    }
    .player-controls-container {
        grid-area: controls;
        width: 100%;
    }
    .track-info { grid-area: info; }
    .volume-controls { grid-area: volume; }
}
.track-details {
    min-width: 0; 
}

#player-track-title,
#player-artist-name {
    white-space: nowrap;    
    overflow: hidden;         
    text-overflow: ellipsis;  
}