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

html, body {
  height: 100%;
  width: 100%;
}

body {
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "MS Mincho", serif;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background-image: url('../images/bronz_sp.avif');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

/* ヘッダー */
header {
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.logo {
  height: 24px;
  width: auto;
}

.instagram-link {
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.3s ease;
}

.instagram-link:hover {
  opacity: 0.8;
}

.instagram-icon {
  height: 40px;
  width: 40px;
}

/* メインコンテンツ */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;  /* 上寄せに変更 */
  align-items: center;
  padding: 210px 20px 40px;    /* 上のpaddingで位置調整 */
  text-align: center;
}

.message-primary {
  font-family: YakuHanMPs, "Hiragino Mincho ProN", "Yu Mincho", "MS Mincho", serif;
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  color: #fff;
  margin-bottom: 24px;
  font-weight: 500;
  font-feature-settings: "palt";  /* プロポーショナルメトリクス */
}

.message-secondary {
  font-family: YakuHanJPs, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  font-size: 0.875rem;
  line-height: 1.8;
  color: #fff;
  letter-spacing: 0.1em;
  font-weight: 400;
}

/* タブレット以上 */
@media (min-width: 768px) {
  header {
    padding: 20px 40px;
  }

  .logo {
    height: 32px;
  }

  .instagram-icon {
    height: 48px;
    width: 48px;
  }

  .message-primary {
    font-size: 3rem;
    letter-spacing: 0.1em;
  }

  .message-secondary {
    font-size: 1.1rem;
  }
}

/* PC以上 */
@media (min-width: 1024px) {
  body {
    background-image: url('../images/pc_bronz.avif');
  }

  main {
    justify-content: center;
    padding: 0 20px 80px;  /* 下にpaddingを入れて上に押し上げる */
  }
}