* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "Noto Sans TC", sans-serif;
  background: #0f172a;
  color: #e2e8f0;
}

header {
  padding: 24px 32px;
  border-bottom: 1px solid #1e293b;
}

header h1 {
  margin: 0;
  font-size: 22px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  padding: 32px;
}

.card {
  background: #1e293b;
  border-radius: 12px;
  padding: 20px;
  min-height: 140px;
}

.card h2 {
  margin: 0 0 12px;
  font-size: 16px;
  color: #93c5fd;
}

.placeholder {
  color: #64748b;
  font-size: 14px;
}