:root {
    --bg-dark: #121212;
    --bg-panel: #181818;
    --bg-hover: #282828;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --accent: #1db954;
    --border: #282828;
}

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

body {
    font-family: 'Circular', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: grid;
    grid-template-columns: 240px 1fr;
    grid-template-rows: 60px 1fr 90px;
    height: 100vh;
    grid-template-areas: 
        "nav header"
        "nav main"
        "nav player";
}

/* Header */
.top-bar {
    grid-area: header;
    background-color: rgba(0,0,0,0.5);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 10;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -1px;
}

.dot { color: var(--accent); }

.user-profile {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--bg-panel);
    padding: 0.25rem 1rem 0.25rem 0.25rem;
    border-radius: 20px;
}

.status { font-size: 0.8rem; font-weight: 600; }
.avatar { width: 28px; height: 28px; background: var(--text-secondary); border-radius: 50%; }

/* Sidebar */
.sidebar-nav {
    grid-area: nav;
    background-color: black;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.sidebar-nav ul { list-style: none; }
.sidebar-nav li { margin-bottom: 1rem; }
.sidebar-nav a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: color 0.2s;
}

.sidebar-nav a:hover, .sidebar-nav li.active a { color: var(--text-primary); }

.playlist-section h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.playlist-section li {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
}
.playlist-section li:hover { color: var(--text-primary); }

/* Main Content */
.content-area {
    grid-area: main;
    background: linear-gradient(180deg, #202020 0%, var(--bg-dark) 100%);
    overflow-y: auto;
    padding: 2rem;
}

.hero-banner {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-bottom: 3rem;
    background: linear-gradient(90deg, #400080 0%, transparent 100%);
    padding: 2rem;
    border-radius: 8px;
}

.banner-text h2 { font-size: 3rem; margin-bottom: 0.5rem; }
.banner-text p { color: var(--text-secondary); margin-bottom: 1.5rem; }
.play-btn {
    background: var(--accent);
    border: none;
    color: black;
    padding: 0.8rem 2rem;
    border-radius: 20px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.1s;
}
.play-btn:hover { transform: scale(1.05); }

.section-header {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.album-card {
    background: var(--bg-panel);
    padding: 1rem;
    border-radius: 8px;
    transition: background 0.3s;
    cursor: pointer;
}

.album-card:hover { background: var(--bg-hover); }

.cover-art {
    width: 100%;
    aspect-ratio: 1;
    background-size: cover;
    border-radius: 4px;
    margin-bottom: 1rem;
    position: relative;
    box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}

.overlay {
    position: absolute;
    bottom: 10px;
    right: 10px;
    width: 40px;
    height: 40px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: black;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.album-card:hover .overlay { opacity: 1; transform: translateY(0); }

.album-info h4 { margin-bottom: 0.5rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.album-info p { color: var(--text-secondary); font-size: 0.85rem; }

/* Track List */
.track-table {
    width: 100%;
    border-collapse: collapse;
    color: var(--text-secondary);
}

.track-table th {
    text-align: left;
    padding: 0.5rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.8rem;
    text-transform: uppercase;
}

.track-table td {
    padding: 0.8rem 0.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.track-table tr:hover td { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.track-table .heart { color: var(--accent); cursor: pointer; }

/* Player Bar */
.player-bar {
    grid-area: player;
    background-color: var(--bg-panel);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem;
}

.current-track { display: flex; align-items: center; gap: 1rem; width: 30%; }
.mini-cover { width: 56px; height: 56px; background: #333; }
.track-details { display: flex; flex-direction: column; }
.t-name { color: var(--text-primary); font-size: 0.9rem; }
.t-artist { color: var(--text-secondary); font-size: 0.75rem; }

.controls { display: flex; align-items: center; gap: 1.5rem; }
.ctrl-btn { background: none; border: none; color: var(--text-secondary); font-size: 1.2rem; cursor: pointer; }
.ctrl-btn:hover { color: var(--text-primary); }
.ctrl-btn.play {
    background: var(--text-primary);
    color: black;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}
.ctrl-btn.play:hover { transform: scale(1.1); }

.volume-control { width: 30%; display: flex; justify-content: flex-end; align-items: center; gap: 0.5rem; }
.progress-bar { width: 100px; height: 4px; background: #535353; border-radius: 2px; }
.fill { width: 70%; height: 100%; background: var(--text-primary); border-radius: 2px; }

@media (max-width: 768px) {
    .app-container {
        grid-template-columns: 1fr;
        grid-template-areas: 
            "header"
            "main"
            "player";
    }
    .sidebar-nav { display: none; }
    .hero-banner { flex-direction: column; text-align: center; }
    .volume-control { display: none; }
}