.hero {
  position: relative;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, #fdfdfd, #f5f5f5);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: rgba(200, 200, 255, 0.2);
  border-radius: 50%;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -120px;
  left: -120px;
  width: 500px;
  height: 500px;
  background: rgba(255, 200, 200, 0.2);
  border-radius: 50%;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 20px;
}

.hero-title {
  font-size: 3rem;
  font-weight: bold;
  color: #333;
  margin-bottom: 15px;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: #666;
  margin-bottom: 30px;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
  }
  
  .btn {
    padding: 12px 25px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
  }
  
  /* 既存ボタン */
  .btn-primary {
    background: #333;
    color: #fff;
  }
  .btn-primary:hover {
    background: #555;
  }
  
  .btn-secondary {
    background: #f0f0f0;
    color: #333;
  }
  .btn-secondary:hover {
    background: #ddd;
  }
  
  /* 新規: 会員登録 */
  .btn-accent {
    background: #ff6b6b;
    color: #fff;
  }
  .btn-accent:hover {
    background: #ff4c4c;
  }
  
  /* 新規: ログイン */
  .btn-outline {
    border: 2px solid #333;
    background: transparent;
    color: #333;
  }
  .btn-outline:hover {
    background: #333;
    color: #fff;
  }

  .howto {
    background: #fafafa;
    padding: 60px 20px;
    text-align: center;
  }
  
  .howto h2 {
    font-size: 2rem;
    margin-bottom: 40px;
    color: #333;
  }
  
  .steps {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
  }
  
  .step {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    width: 280px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: transform 0.3s;
  }
  
  .step:hover {
    transform: translateY(-5px);
  }
  
  .step-number {
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    border-radius: 50%;
    background: #333;
    color: #fff;
    font-weight: bold;
    margin-bottom: 15px;
  }