/* ==========================================
   CSS変数（プロジェクトごとに変更してください）
   ========================================== */
:root {
  --color-primary: #000000;
  --color-accent: #cccccc;
  --color-back: #f5f5f5;
  --color-black: #111111;
  --color-white: #ffffff;

  --font-sans: 'Noto Sans JP', sans-serif;
  --font-serif: 'Shippori Mincho B1', serif;
  --font-en: 'Figtree', sans-serif;
}

/* ==========================================
   ベーススタイル
   ========================================== */
html {
  font-size: 62.5%; /* 1rem = 10px */
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  line-height: 1.8;
  color: var(--color-black);
  background: var(--color-white);
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ==========================================
   共通レイアウト
   ========================================== */
#_ .content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

#_ .font-serif { font-family: var(--font-serif); }
#_ .font-en    { font-family: var(--font-en); }

/* ==========================================
   ボタン
   ========================================== */
#_ .button-l {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 48px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 1.5rem;
  font-weight: 700;
  border: 2px solid var(--color-primary);
  border-radius: 4px;
  transition: background 0.2s, color 0.2s;
  cursor: pointer;
}

#_ .button-l:hover {
  background: transparent;
  color: var(--color-primary);
}

/* ==========================================
   ヘッダー
   ========================================== */
#_ .header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: var(--color-white);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

#_ .header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
}

#_ .header__logo img {
  height: 40px;
  width: auto;
}

#_ .header__nav-list {
  display: flex;
  gap: 32px;
  list-style: none;
}

#_ .header__nav-list a {
  font-family: var(--font-en);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  transition: color 0.2s;
}

#_ .header__nav-list a:hover {
  color: var(--color-primary);
}

/* ハンバーガーボタン */
#_ .header__ham {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 42px;
  height: 42px;
  background: var(--color-primary);
  border-radius: 50%;
  border: none;
  cursor: pointer;
}

#_ .header__ham span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-white);
  transition: transform 0.3s, opacity 0.3s;
}

#_ .header.is-menu-open .header__ham {
  background: var(--color-black);
}

/* ==========================================
   セクション共通
   ========================================== */
#_ .section {
  padding: 80px 0;
}

#_ .section__head {
  text-align: center;
  margin-bottom: 48px;
}

#_ .section__en {
  display: block;
  font-family: var(--font-en);
  font-size: 4rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-primary);
}

#_ .section__ja {
  display: block;
  font-size: 1.4rem;
  color: #666;
  margin-top: 4px;
}

/* ==========================================
   フッター
   ========================================== */
#_ .footer {
  background: var(--color-black);
  color: var(--color-white);
  padding: 48px 24px;
}

#_ .footer__inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

#_ .footer__logo {
  height: 48px;
  width: auto;
  filter: brightness(0) invert(1);
}

#_ .footer__copy {
  font-size: 1.2rem;
  opacity: 0.6;
}

/* ==========================================
   レスポンシブ（SP: 767px以下）
   ========================================== */
@media (max-width: 767px) {
  body {
    font-size: 1.4rem;
  }

  #_ .header__nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    height: calc(100vh - 72px);
    background: var(--color-white);
    padding: 40px 24px;
    overflow-y: auto;
  }

  #_ .header.is-menu-open .header__nav {
    display: block;
  }

  #_ .header__nav-list {
    flex-direction: column;
    gap: 24px;
  }

  #_ .header__nav-list a {
    font-size: 2rem;
  }

  #_ .header__ham {
    display: flex;
  }

  #_ .section {
    padding: 56px 0;
  }

  #_ .section__en {
    font-size: 3rem;
  }
}