:root {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --accent: #38bdf8;
  --text-main: #f8fafc;
  --text-sub: #94a3b8;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  margin: 0;
  padding: 2rem;
}

header {
  text-align: center;
  margin-bottom: 3rem;
}

header h1 {
  font-size: 2.5rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

header p {
  color: var(--text-sub);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.track-card {
  background: var(--card-bg);
  border: 1px solid #334155;
  border-radius: 8px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.track-card h3 {
  margin: 0 0 0.5rem 0;
  color: #fff;
}

.track-card p {
  margin: 0.25rem 0;
  color: var(--text-sub);
  font-size: 0.9rem;
}

.track-card a {
  display: inline-block;
  margin-top: 1rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: bold;
}

.track-card a:hover {
  text-decoration: underline;
}

.user-tag {
  display: block;
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--text-sub);
  border-top: 1px solid #334155;
  padding-top: 0.5rem;
}