/* =========================================================
   Header
========================================================= */

/* ヒーロー画像の上に重ねる半透明ヘッダー */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  transition: box-shadow var(--duration) var(--ease);
}

/* 背景ぼかしは疑似要素に持たせる（header自体に付けるとドロワーのfixedが効かなくなるため） */
.header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(247, 250, 253, 0.55);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  transition: background-color var(--duration) var(--ease);
}

/* スクロール後は本文の可読性を優先して少し不透明度を上げる */
.header.is-scrolled::before,
.header.is-open::before {
  background: rgba(247, 250, 253, 0.8);
}

/* スクロール後にだけうっすら境界を出す */
.header.is-scrolled {
  box-shadow: 0 1px 0 var(--color-border), 0 8px 24px rgba(12, 67, 136, 0.04);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* ---------- Logo ---------- */
.header__logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  gap: 20px;
  color: var(--color-text);
  line-height: 1;
}

.header__logo-name {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.header__logo-divider {
  width: 1px;
  height: 28px;
  background: rgba(32, 36, 42, 0.25);
}

.header__logo-sub {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.12em;
}

/* ---------- Nav (PC) ---------- */
.header__nav {
  display: flex;
  align-items: center;
  gap: 48px;
}

.header__nav-list {
  display: flex;
  align-items: center;
  gap: 40px;
}

.header__nav-link {
  position: relative;
  display: inline-block;
  padding-block: 8px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1;
  white-space: nowrap;
  transition: color var(--duration) var(--ease);
}

.header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--duration) var(--ease);
}

.header__nav-link:hover {
  color: var(--color-primary);
}

.header__nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.header__entry {
  height: 56px;
  padding-inline: 54px;
  font-size: 15px;
}

/* ---------- Toggle (SP) ---------- */
.header__toggle {
  display: none;
}

/* ---------- 中間幅 ---------- */
@media (max-width: 1240px) {
  .header__nav { gap: 32px; }
  .header__nav-list { gap: 28px; }
  .header__nav-link { font-size: 14px; }
}

/* ---------- Tablet / SP ---------- */
@media (max-width: 1080px) {
  .header__logo { gap: 14px; }
  .header__logo-name { font-size: 22px; }
  .header__logo-divider { height: 20px; }
  .header__logo-sub { font-size: 13px; }

  .header__toggle {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 7px;
    width: 48px;
    height: 48px;
    margin-right: -8px;
    border-radius: 50%;
  }

  .header__toggle-line {
    display: block;
    width: 24px;
    height: 1.5px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform var(--duration) var(--ease);
  }

  .header__toggle[aria-expanded="true"] .header__toggle-line:nth-child(1) {
    transform: translateY(4.25px) rotate(45deg);
  }

  .header__toggle[aria-expanded="true"] .header__toggle-line:nth-child(2) {
    transform: translateY(-4.25px) rotate(-45deg);
  }

  /* ドロワー */
  .header__nav {
    position: fixed;
    inset: var(--header-height) 0 0 0;
    flex-direction: column;
    align-items: stretch;
    gap: 40px;
    padding: 24px var(--gutter) 48px;
    background: var(--color-bg-light);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--duration) var(--ease),
                transform var(--duration) var(--ease),
                visibility 0s linear var(--duration);
  }

  .header.is-open .header__nav {
    opacity: 1;
    visibility: visible;
    transform: none;
    transition-delay: 0s;
  }

  .header.is-open {
    box-shadow: 0 1px 0 var(--color-border);
  }

  .header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .header__nav-list li {
    border-bottom: 1px solid var(--color-border);
  }

  .header__nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: 22px;
    font-size: 16px;
  }

  /* SPでは下線の代わりに右端に矢印 */
  .header__nav-link::after {
    position: static;
    width: 8px;
    height: 8px;
    background: none;
    border-top: 1.5px solid var(--color-primary);
    border-right: 1.5px solid var(--color-primary);
    transform: rotate(45deg);
  }

  .header__nav-link:hover::after {
    transform: rotate(45deg) translate(2px, -2px);
  }

  .header__entry {
    width: 100%;
    height: 60px;
    font-size: 16px;
  }
}

@media (max-width: 767px) {
  .header__logo { gap: 12px; }
  .header__logo-name { font-size: 20px; letter-spacing: 0.14em; }
  .header__logo-divider { height: 18px; }
  .header__logo-sub { font-size: 12px; }
}