html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  overflow-x: hidden;
  height: 100%;
  background: #000;
  color: #fff;
  font-family: 'Noto Serif JP', serif;
}

/* ヘッダー（そのまま） */

.site-header {
  position: fixed;
  width: 100%;
  padding: 20px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  box-sizing: border-box; 
}

.logo {
  font-size: 24px;
  font-weight: bold;
  font-family: 'Futura', sans-serif;
}

.logo img {
  height: 60px;
}


.main-nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0;
}

.main-nav a {
  font-family: 'Poppins', sans-serif;
  letter-spacing: 0.1em;
  font-weight: 500;
  color: #fff;
  text-decoration: none;
  transition: opacity 0.3s ease;
  font-size: 22px;
  font-weight: 100;
}
.main-nav a:hover {
  opacity: 0.7;
}

/* HERO全体 */
.hero {
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
}

/* 中央揃えエリア */
.center-content {
  position: relative;
  width: 200px;
  height: 200px;
}

/* 円のアニメーション */
.circle-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  width: 200px;
  height: 200px;
  animation: rotate 10s linear infinite;
}
.circle-container {
    position: relative;
}
.circle {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 350px;
  height: 350px;
  transform: translate(-50%, -50%);
  transform-origin: center center;
}

/* テキスト中央表示 */
.catch {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 50px;
  line-height: 1.5;
  text-align: center;
  width: 300px;
  z-index: 1;
  margin: 0;
}
.catch span {
    padding-left: 60px;
}

/* アニメーション */
@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ------------------------------ */
/* スマホ対応（レスポンシブ） */
/* ------------------------------ */

@media screen and (max-width: 768px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    padding: 15px 20px;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
  }

  .main-nav a {
    font-size: 18px;
  }

  .logo img {
    height: 45px;
  }

  .circle {
    width: 250px;
    height: 250px;
  }

  .catch {
    font-size: 32px;
    width: 250px;
  }

  .catch span {
    padding-left: 30px;
  }
}