:root {
    --bg-color: #fafafa;
    --text-color: #333333;
    --text-muted: #666666;
    --border-color: #e0e0e0;
    --primary-color: #d51007; /* Last.fm red */
    --card-bg: #ffffff;
    --graduated-color: #008C4A; /* Autodesk Green */
    --hover-color: #f5f5f5;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #121212;
        --text-color: #e0e0e0;
        --text-muted: #a0a0a0;
        --border-color: #333333;
        --card-bg: #1e1e1e;
        --hover-color: #2a2a2a;
    }
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 40px 0;
    margin-bottom: 40px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.stats-bar {
    display: flex;
    gap: 20px;
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.stat-item span {
    font-weight: 600;
    color: var(--text-color);
}

.controls {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    align-items: center;
}

input[type="text"], select {
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--card-bg);
    color: var(--text-color);
    font-family: inherit;
    font-size: 0.95rem;
}

input[type="text"] {
    flex: 1;
    min-width: 250px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    cursor: pointer;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 60px;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.artist-name {
    font-size: 1.2rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--text-color);
}

.artist-name:hover {
    color: var(--primary-color);
}

.badge {
    font-size: 0.7rem;
    font-weight: 800;
    padding: 4px 8px;
    border-radius: 12px;
    text-transform: uppercase;
}

.badge-new {
    background-color: rgba(213, 16, 7, 0.1);
    color: var(--primary-color);
}

.badge-graduated {
    background-color: rgba(0, 140, 74, 0.1);
    color: var(--graduated-color);
}

.card-body {
    flex: 1;
}

.track-info {
    margin-bottom: 15px;
}

.track-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.track-name {
    font-weight: 600;
    text-decoration: none;
    color: var(--text-color);
    display: block;
}

.track-name:hover {
    text-decoration: underline;
}

.meta-info {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

.meta-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 4px;
}

footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}

.loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}