/* ============================================================
   AI観測ラボ ブログ — observatory-common.css
   全ページ共通スタイル / Observatory Design System
   2026.02
   ============================================================ */

/* ===== CSS Variables ===== */
:root {
  --bg:             #F4F6FB;
  --bg2:            #ECEEF7;
  --bg3:            #E4E8F4;
  --ink:            #1E2235;
  --ink-mid:        #4A5068;
  --ink-soft:       #8B92AA;
  --star-blue:      #6B8FBF;
  --star-blue-pale: #D4E2F2;
  --gold:           #B8954A;
  --gold-pale:      #F0E4C0;
  --line:           rgba(107,143,191,0.15);
  --line-strong:    rgba(107,143,191,0.28);
  --white:          #ffffff;
  --font-serif:     'Cormorant Garamond', 'Hiragino Mincho ProN', serif;
  --font-sans:      'Noto Sans JP', 'Hiragino Sans', sans-serif;
  --font-mono:      'DM Mono', 'IBM Plex Mono', monospace;
  --transition:     .22s ease;
}

/* ===== SP 横スクロール防止 ===== */
html,
body {
  overflow-x: hidden !important;
  max-width: 100vw !important;
}

.site,
.site-content,
.inside-article,
.grid-container {
  max-width: 100vw !important;
  width: 100% !important;
  box-sizing: border-box !important;
}

/* ===== ページ背景 ===== */
body {
  background: var(--bg) !important;
  color: var(--ink) !important;
  font-family: var(--font-sans) !important;
}

/* テーマデフォルトの背景画像・グラデーション除去 */
body::before,
body::after {
  background-image: none !important;
}

/* ===== ヘッダー ===== */
.site-header,
#masthead {
  background: rgba(244,246,251,0.88) !important;
  border-bottom: 1px solid var(--line-strong) !important;
  backdrop-filter: blur(12px) !important;
  -webkit-backdrop-filter: blur(12px) !important;
  box-shadow: none !important;
  position: sticky !important;
  top: 0 !important;
  z-index: 100 !important;
  padding-left: 24px !important;
  padding-right: 24px !important;
}

/* ===== ロゴ ===== */
.main-title a,
.site-title a {
  font-family: var(--font-serif) !important;
  font-size: 17px !important;
  font-weight: 300 !important;
  letter-spacing: .04em !important;
  color: var(--ink) !important;
  background: none !important;
  -webkit-text-fill-color: var(--ink) !important;
  -webkit-background-clip: initial !important;
  background-clip: initial !important;
  text-shadow: none !important;
  position: relative !important;
}

.main-title a::after,
.site-title a::after {
  content: none !important;
}

/* "AI" だけモノスペース・星ブルーで前置き */
.main-title a::before,
.site-title a::before {
  content: 'AI' !important;
  font-family: var(--font-mono) !important;
  font-size: 12px !important;
  font-weight: 400 !important;
  letter-spacing: .14em !important;
  color: var(--star-blue) !important;
  -webkit-text-fill-color: var(--star-blue) !important;
  margin-right: 3px !important;
  vertical-align: middle !important;
}

/* ===== ナビゲーション ===== */
.main-navigation a,
.main-nav a {
  font-family: var(--font-mono) !important;
  font-size: 11px !important;
  letter-spacing: .12em !important;
  text-transform: uppercase !important;
  color: var(--ink-soft) !important;
  font-weight: 400 !important;
  text-shadow: none !important;
  background: none !important;
}

.main-navigation a:hover,
.main-nav a:hover {
  color: var(--star-blue) !important;
  text-shadow: none !important;
  background: none !important;
}

/* 現在ページのナビリンク */
.main-navigation .current-menu-item > a,
.main-nav .current-menu-item > a {
  color: var(--star-blue) !important;
}

/* ===== SP ハンバーガーメニュー ===== */
@media (max-width: 680px) {
  .main-navigation .menu-toggle {
    background: transparent !important;
    border: 1px solid var(--line-strong) !important;
    border-radius: 0 !important;
    box-shadow: none !important;
    color: var(--ink-mid) !important;
    padding: 8px 12px !important;
    font-family: var(--font-mono) !important;
    font-size: 16px !important;
    letter-spacing: .05em !important;
  }

  .main-navigation.toggled .main-nav {
    margin-top: 8px !important;
    background: rgba(244,246,251,0.97) !important;
    border: 1px solid var(--line-strong) !important;
    border-radius: 0 !important;
    backdrop-filter: blur(12px) !important;
    -webkit-backdrop-filter: blur(12px) !important;
    box-shadow: 0 8px 24px rgba(107,143,191,.1) !important;
  }

  .main-navigation .main-nav ul li a {
    color: var(--ink-mid) !important;
    font-family: var(--font-mono) !important;
    font-size: 11px !important;
    letter-spacing: .16em !important;
    text-transform: uppercase !important;
    padding: 16px 20px !important;
    border-bottom: 1px solid var(--line) !important;
    background: transparent !important;
  }

  .main-navigation .main-nav ul li a:hover {
    color: var(--star-blue) !important;
    background: rgba(107,143,191,.04) !important;
  }
}

@media (max-width: 680px) {
  .main-navigation {
    display: flex !important;
    justify-content: flex-end !important;
    align-items: center !important;
  }
}

/* ===== フッター ===== */
.site-footer,
#colophon {
  background: var(--bg2) !important;
  border-top: 1px solid var(--line-strong) !important;
  box-shadow: none !important;
  color: var(--ink-soft) !important;
  font-family: var(--font-mono) !important;
  font-size: 10px !important;
  letter-spacing: .12em !important;
}

.site-footer a,
#colophon a {
  color: var(--star-blue) !important;
  text-decoration: none !important;
}

.site-footer a:hover,
#colophon a:hover {
  color: var(--ink) !important;
}

/* ===== フッター中央寄せ ===== */
.site-footer .copyright-bar,
.site-footer p,
#colophon .copyright-bar,
#colophon p {
  text-align: center !important;
}

@media (max-width: 767px) {
  .obs-footer-cta-pc-only {
    display: none;
  }
}

/* GeneratePressデフォルトフッター非表示 */
footer.site-info {
  display: none !important;
}

@media (max-width: 680px) {
  .inside-header.grid-container {
    display: flex !important;
    flex-direction: row !important;
    justify-content: space-between !important;
    align-items: center !important;
    padding-left: 16px !important;
    padding-right: 16px !important;
  }

  .site-branding {
    flex-shrink: 0 !important;
  }

  .main-navigation {
    flex-shrink: 0 !important;
  }
}