* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.4s ease, color 0.4s ease;
  display: flex;
}

.sidebar {
  width: 260px;
  min-height: 100vh;
  background: var(--sidebar);
  padding: 1rem;
  position: sticky;
  top: 0;
}

.sidebar h1 {
  margin-top: 0;
}

.sidebar ul {
  list-style: none;
  padding: 0;
}

.sidebar li {
  margin: 0.5rem 0;
}

.sidebar a {
  color: var(--text);
  text-decoration: none;
}

.content {
  flex: 1;
  padding: 2rem;
}

.hero {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  margin-bottom: 2rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

@media (max-width: 800px) {
  body {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    min-height: auto;
    position: relative;
  }
}