/* ============================================================
 * subaco Header
 *
 * 3円ハンバーガー + MENU/CLOSE ラベルのスティッキーヘッダー（B案）。
 * - home 初期：背景透過、ロゴ・ボタン・ラベルは Tinted（白）
 * - home スクロール50px超：背景 半透明Tinted + backdrop-filter blur、
 *   テキストは Charcoal に色反転
 * - home 以外：常時 半透明Tinted + blur、Charcoal テキスト
 *
 * グラスモーフィズム（backdrop-filter）非対応ブラウザ向けに
 * @supports でフォールバックを用意する。
 * ============================================================ */

:root {
  --sba-teal:        #427c89;
  --sba-terracotta:  #c45c3a;
  --sba-charcoal:    #1a1a1a;
  --sba-charcoal-2:  #0f0f0f;
  --sba-tinted:      #f5f4f2;
  --sba-tinted-dim:  rgba(245, 244, 242, 0.55);
  --sba-tinted-dimmer:rgba(245, 244, 242, 0.18);
  --sba-gold:        #f7ba39;
}

/* ------------------------------------------------------------
 * Header container
 * ------------------------------------------------------------ */

.sba-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: 64px;
  /* 固定ページ・archive・single のデフォルト：半透明Tinted + blur + Tealテキスト */
  color: var(--sba-teal);
  background-color: rgba(245, 244, 242, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background-color 0.3s ease, color 0.3s ease, backdrop-filter 0.3s ease;
}

/* home 初期：透過 + Tinted（白）テキスト */
body.home .sba-header {
  color: var(--sba-tinted);
  background-color: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

/* home スクロール50px超：半透明Tinted + blur + Tealテキストに反転 */
body.home .sba-header[data-scrolled="true"] {
  color: var(--sba-teal);
  background-color: rgba(245, 244, 242, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* backdrop-filter 非対応ブラウザ：不透明度を上げてフォールバック */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .sba-header,
  body.home .sba-header[data-scrolled="true"] {
    background-color: rgba(245, 244, 242, 0.92);
  }
}

/* .sba-header__inner には position: relative を入れない（落とし穴回避：
 * ハンバーガー位置の絶対配置基準がコンテンツ幅に固定されてしまうため） */
.sba-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 768px) {
  .sba-header__inner {
    padding: 0 16px;
  }
}

/* ------------------------------------------------------------
 * PC Navigation（961px以上で表示）
 * ------------------------------------------------------------ */

.sba-nav {
  display: none;
  margin-left: auto;
  margin-right: 1.5rem;
}

.sba-nav__list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 1.75rem;
  align-items: center;
}

.sba-nav__link {
  font-family: 'Outfit', 'Noto Sans JP', sans-serif;
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: currentColor;
  text-decoration: none;
  position: relative;
  padding: 0.25rem 0;
  transition: color 0.3s ease;
}

.sba-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background-color: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.sba-nav__link:hover::after,
.sba-nav__link:focus-visible::after {
  transform: scaleX(1);
}

@media (min-width: 961px) {
  .sba-nav {
    display: block;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sba-nav__link,
  .sba-nav__link::after {
    transition: none;
  }
}

/* ------------------------------------------------------------
 * Logo
 * ------------------------------------------------------------ */

.sba-header__logo {
  display: inline-flex;
  align-items: center;
  height: 28px;
  text-decoration: none;
  color: inherit;
}

.sba-header__logo svg {
  height: 100%;
  width: auto;
  display: block;
}

/* ------------------------------------------------------------
 * 3-Circle Menu Button + MENU label
 * ------------------------------------------------------------ */

.sba-menu-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  width: auto;
  min-width: 56px;
  height: auto;
  padding: 4px 6px;
  background: transparent;
  border: none;
  cursor: pointer;
  color: inherit;
}

.sba-menu-btn__icon {
  width: 44px;
  height: 44px;
  display: block;
  overflow: visible;
}

.sba-menu-btn__label {
  font-family: 'Outfit', sans-serif;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.2em;
  line-height: 1;
  color: currentColor;
  /* letter-spacing 分の右側余白を視覚的に相殺 */
  margin-left: 0.2em;
  transition: letter-spacing 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.sba-menu-btn:hover .sba-menu-btn__label {
  letter-spacing: 0.28em;
}

.sba-menu-circles {
  transform-box: fill-box;
}

.sba-menu-circle {
  fill: currentColor;
  opacity: 0.55;
  transform-box: fill-box;
  transform-origin: center;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s ease;
  animation: sba-menu-breathe 4s ease-in-out infinite;
}

/* 3円それぞれに 0.4s ずつ遅延を与えて呼吸の位相をずらす */
.sba-menu-circle--top { animation-delay: 0s; }
.sba-menu-circle--bl  { animation-delay: 0.4s; }
.sba-menu-circle--br  { animation-delay: 0.8s; }

@keyframes sba-menu-breathe {
  0%, 100% { opacity: 0.55; }
  50%      { opacity: 0.85; }
}

/* ホバー：3円が外側に散る */
.sba-menu-btn:hover .sba-menu-circle--top {
  transform: translate(0, -2px);
  opacity: 0.95;
}
.sba-menu-btn:hover .sba-menu-circle--bl {
  transform: translate(-2px, 1.5px);
  opacity: 0.95;
}
.sba-menu-btn:hover .sba-menu-circle--br {
  transform: translate(2px, 1.5px);
  opacity: 0.95;
}

/* prefers-reduced-motion：呼吸・ホバー変形・背景transitionを停止 */
@media (prefers-reduced-motion: reduce) {
  .sba-header,
  .sba-menu-circle,
  .sba-menu-btn__label {
    transition: none;
    animation: none;
  }
  .sba-menu-btn:hover .sba-menu-circle--top,
  .sba-menu-btn:hover .sba-menu-circle--bl,
  .sba-menu-btn:hover .sba-menu-circle--br {
    transform: none;
  }
  .sba-menu-btn:hover .sba-menu-btn__label {
    letter-spacing: 0.2em;
  }
}

/* ------------------------------------------------------------
 * Drawer (全画面オーバーレイ)
 * ------------------------------------------------------------ */

.sba-drawer {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--sba-charcoal);
  color: var(--sba-tinted);
  /* 右上（44pxマージン、32pxヘッダー中央あたり）から円形展開 */
  clip-path: circle(0% at calc(100% - 44px) 32px);
  transition: clip-path 0.65s cubic-bezier(0.65, 0, 0.35, 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.sba-drawer.is-open {
  clip-path: circle(150% at calc(100% - 44px) 32px);
  pointer-events: auto;
}

/* ラベル */
.sba-drawer__label {
  position: absolute;
  top: 36px;
  left: 48px;
  font-family: 'Outfit', sans-serif;
  font-size: 0.62rem;
  font-weight: 400;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sba-tinted-dim);
}

@media (max-width: 768px) {
  .sba-drawer__label {
    left: 24px;
    top: 28px;
  }
}

/* 閉じるボタン（右上 ×）— MENU ボタンと対称な構造に */
.sba-drawer__close {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  position: absolute;
  top: 16px;
  right: 16px;
  width: auto;
  min-width: 56px;
  height: auto;
  padding: 4px 6px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--sba-tinted);
  opacity: 0.75;
  transition: opacity 0.25s ease;
}

.sba-drawer__close:hover {
  opacity: 1;
}

.sba-drawer__close-icon {
  width: 32px;
  height: 32px;
  display: block;
  overflow: visible;
}

.sba-drawer__close-label {
  font-family: 'Outfit', sans-serif;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.2em;
  line-height: 1;
  color: currentColor;
  margin-left: 0.2em;
  transition: letter-spacing 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.sba-drawer__close:hover .sba-drawer__close-label {
  letter-spacing: 0.28em;
}

/* ナビゲーション */
.sba-drawer__nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.sba-drawer__item {
  display: block;
  text-decoration: none;
  text-align: center;
  margin-bottom: 0.6rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s cubic-bezier(0.34, 1, 0.64, 1);
}

.sba-drawer.is-open .sba-drawer__item { opacity: 1; transform: translateY(0); }
.sba-drawer.is-open .sba-drawer__item:nth-child(1) { transition-delay: 0.30s; }
.sba-drawer.is-open .sba-drawer__item:nth-child(2) { transition-delay: 0.38s; }
.sba-drawer.is-open .sba-drawer__item:nth-child(3) { transition-delay: 0.46s; }
.sba-drawer.is-open .sba-drawer__item:nth-child(4) { transition-delay: 0.54s; }
.sba-drawer.is-open .sba-drawer__item:nth-child(5) { transition-delay: 0.62s; }

.sba-drawer__item-en {
  display: block;
  font-family: 'Outfit', sans-serif;
  font-size: clamp(2.4rem, 6vw, 4.8rem);
  font-weight: 400;
  letter-spacing: 0.03em;
  line-height: 1.05;
  color: var(--sba-tinted);
  transition: color 0.22s ease, transform 0.22s cubic-bezier(0.34, 1.2, 0.64, 1);
}

.sba-drawer__item-jp {
  display: block;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.95rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  color: var(--sba-tinted);
  opacity: 0.55;
  margin-top: 0.4rem;
  margin-bottom: 0.4rem;
  transition: opacity 0.2s ease, color 0.2s ease;
}

.sba-drawer__item:hover .sba-drawer__item-en,
.sba-drawer__item:focus-visible .sba-drawer__item-en {
  color: var(--sba-gold);
}

.sba-drawer__item:hover .sba-drawer__item-jp,
.sba-drawer__item:focus-visible .sba-drawer__item-jp {
  opacity: 0.85;
}

.sba-drawer__item:focus-visible {
  outline: 1px dashed var(--sba-tinted-dimmer);
  outline-offset: 6px;
}

/* ESC ヒント（PCのみ） */
.sba-drawer__esc {
  position: absolute;
  bottom: 32px;
  font-family: 'Outfit', sans-serif;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sba-tinted-dim);
  user-select: none;
}

@media (max-width: 768px) {
  .sba-drawer__esc {
    display: none;
  }
}

/* body スクロールロック（drawer 開放中） */
body.sba-drawer-open {
  overflow: hidden;
}

/* prefers-reduced-motion：ドロワーの transition / stagger を簡略化 */
@media (prefers-reduced-motion: reduce) {
  .sba-drawer {
    transition: clip-path 0.2s ease;
  }
  .sba-drawer__item {
    transition: opacity 0.2s ease;
    transform: none;
  }
  .sba-drawer.is-open .sba-drawer__item {
    transition-delay: 0s;
  }
  .sba-drawer__close,
  .sba-drawer__close-label {
    transition: opacity 0.2s ease;
  }
  .sba-drawer__close:hover .sba-drawer__close-label {
    letter-spacing: 0.2em;
  }
}

/* ------------------------------------------------------------
 * アーカイブと個別記事ページのみ：
 * 独自ヒーロー帯を持たないテンプレートのため、
 * ヘッダー被り防止に上部余白を確保する。
 * ------------------------------------------------------------ */

body.archive,
body.single {
  padding-top: 64px;
}