/* ==========================================================
   共通レイアウト：ヘッダー・メニュー・フッター・ページ先頭へ
   ※ js/common.js が使う前提のid/class：#common_header、.common_header__toggle、#common_header_drawer、
      #common_fixed（.is-show で表示）、.common_header--lock（html に付く）
   ========================================================== */

/* ---------- ヘッダー（常に表示） ---------- */
.common_header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  display: flex;
  align-items: stretch;
  height: var(--header-h);
  background: var(--color-white);
  box-shadow: 0 0 8px var(--color-shadow-cyan);
}

.common_header__logo {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-right: auto;
  padding-left: clamp(12px, 1.6vw, 24px);
  white-space: nowrap;
}
@media (max-width: 767px) {
  .common_header__logo {
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
  }
}

.common_header__logo-en {
  font-family: var(--font-en);
  font-weight: 600;
  font-size: 26px;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--color-navy);
}
@media (max-width: 767px) {
  .common_header__logo-en {
    font-size: 20px;
  }
}

.common_header__logo-ja {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
}
@media (max-width: 767px) {
  .common_header__logo-ja {
    font-size: 10px;
    line-height: 1.5;
  }
}

.common_header__nav {
  display: flex;
}
@media (max-width: 767px) {
  .common_header__nav {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    flex: 0 1 216px;
  }
}

.common_header__nav a {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 104px;
  font-size: 13px;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.1em;
  text-align: center;
  transition: color 0.25s ease;
}
.common_header__nav a:hover {
  color: var(--color-brand);
}
@media (max-width: 767px) {
  .common_header__nav a {
    width: auto;
    font-size: 10px;
    letter-spacing: 0.04em;
    border-left: 1px solid var(--color-black);
  }
  .common_header__nav a:nth-child(-n + 2) {
    border-bottom: 1px solid var(--color-black);
  }
}

.common_header__nav a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22%;
  bottom: 22%;
  width: 1px;
  background: var(--color-black);
}
@media (max-width: 767px) {
  .common_header__nav a::before {
    display: none;
  }
}

.common_header__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 136px;
  border-left: 1px solid var(--color-black);
}
@media (max-width: 767px) {
  .common_header__toggle {
    flex: 0 0 var(--header-h);
    width: var(--header-h);
    border-left: 0;
    color: var(--color-white);
    background: var(--color-black);
  }
}

.common_header__toggle-icon {
  position: relative;
  display: block;
  width: 34px;
  height: 10px;
}

.common_header__toggle-bar {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform 0.3s ease, top 0.3s ease;
}
.common_header__toggle-bar:nth-child(1) { top: 0; }
.common_header__toggle-bar:nth-child(2) { top: 8px; }
.common_header.is-open .common_header__toggle-bar:nth-child(1) { top: 4px; transform: rotate(22deg); }
.common_header.is-open .common_header__toggle-bar:nth-child(2) { top: 4px; transform: rotate(-22deg); }

.common_header__toggle-text {
  font-family: var(--font-en);
  font-size: 13px;
  line-height: 1;
  letter-spacing: 0.14em;
}
@media (max-width: 767px) {
  .common_header__toggle-text {
    display: none;
  }
}

/* ---------- MENU（ヘッダーの下に開く） ---------- */
.common_header__drawer {
  position: fixed;
  inset: var(--header-h) 0 0;
  z-index: 99;
  overflow-y: auto;
  padding: clamp(32px, 4vw, 72px) var(--gutter);
  background: var(--gradient-soft);
  backdrop-filter: blur(10px);
}
.common_header__drawer[hidden] {
  display: none;
}

.common_header__drawer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(24px, 4vw, 64px);
  max-width: 1120px;
  margin-inline: auto;
}
@media (max-width: 767px) {
  .common_header__drawer-grid {
    grid-template-columns: 1fr;
  }
}

.common_header__drawer-title {
  display: block;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-black);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-brand);
}

.common_header__drawer-list a {
  display: block;
  padding: 10px 0;
  font-weight: 500;
  letter-spacing: 0.06em;
  transition: color 0.25s ease;
}
.common_header__drawer-list a:hover {
  color: var(--color-brand);
}

html.common_header--lock {
  overflow: hidden;
}

/* ---------- フッター ---------- */
.common_footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px clamp(20px, 3vw, 44px);
  padding: 28px 84px 28px clamp(16px, 1.6vw, 24px);   /* 右は固定の「ページ先頭へ」ボタンのぶん空ける */
  background: var(--color-white);
}
@media (max-width: 767px) {
  .common_footer {
    flex-direction: column;
    padding: 40px 16px 88px;
  }
}

.common_footer__logo {
  font-family: var(--font-en);
  font-weight: 600;
  font-size: 26px;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--color-navy);
}

.common_footer__nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 0;
}
@media (max-width: 767px) {
  .common_footer__nav-list {
    justify-content: center;
  }
}

.common_footer__nav-list a {
  display: block;
  padding: 0 14px;
  font-size: 12px;
  letter-spacing: 0.08em;
  border-left: 1px solid var(--color-line);
  transition: color 0.25s ease;
}
.common_footer__nav-list a:hover {
  color: var(--color-brand);
}

.common_footer__copy {
  margin: 0 0 0 auto;
  font-family: var(--font-en);
  font-size: 11px;
  line-height: 1.8;
  letter-spacing: 0.1em;
  text-align: right;
}
@media (max-width: 767px) {
  .common_footer__copy {
    margin: 0;
    text-align: center;
  }
}

.common_footer__note {
  display: block;
  font-family: var(--font-sans);
}

/* ---------- ページ先頭へ（MVを過ぎたら表示） ---------- */
.common_fixed {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 50;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.common_fixed.is-show {
  opacity: 1;
  visibility: visible;
}

.common_fixed__totop {
  position: relative;
  display: block;
  width: 48px;
  height: 48px;
  background: var(--gradient-bright);
  border: 1px solid var(--color-black);
  box-shadow: 2px 2px 0 var(--color-black);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.common_fixed__totop:hover {
  transform: translate(2px, 2px);
  box-shadow: 0 0 0 var(--color-black);
}

.common_fixed__totop::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 54%;
  width: 12px;
  height: 12px;
  border-top: 2px solid var(--color-white);
  border-left: 2px solid var(--color-white);
  transform: translate(-50%, -50%) rotate(45deg);
}