/* リセットと基本設定 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}


body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: #121212;
  color: #ffffff;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* コンテナ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* 見出し */
h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ボタン */
.button {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: #4ecdc4;
  color: #121212;
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.button:hover {
  background-color: #ff6b6b;
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

/* カード */
.card {
  background-color: #1e1e1e;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease;
  max-width: 50px;
  text-align: center;
}

.card:hover {
  transform: scale(1.05);
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  .container {
    padding: 1rem;
  }

  .card {
    padding: 1.5rem;
  }
}