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

body {
  font-family: "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  line-height: 1.6;
  color: #333;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  padding: 2rem;
  text-align: center;
  background: #1a1a2e;
  color: #fff;
}

main {
  flex: 1;
  padding: 2rem;
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
}

footer {
  padding: 1rem 2rem;
  text-align: center;
  background: #f5f5f5;
  color: #666;
  font-size: 0.875rem;
}