/* css/layout/header.css */

/* 固定ヘッダー（初期は薄い背景） */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(20, 130, 159, 0.10);
  backdrop-filter: blur(10px);
  z-index: 3000;
  transition: background-color .2s ease;
}

/* スクロール後（JSで .is-solid 付与） */
header.is-solid {
  background-color: rgba(20, 130, 159, 0.90);
}

/* 中身レイアウト */
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .5rem 1rem;
  height: var(--header-h);
}

/* 左：ロゴ + テキスト */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #fff;
}
.logo {
  display: block;
  height: 40px;
  width: auto;
  opacity: 0.3;
  transition: opacity .2s ease;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}
.site-tagline {
  font-size: 14px;
  color: rgba(255, 255, 255, .3);
}
.site-title {
  margin: 0;
  font-size: 40px;
  font-weight: 800;
  letter-spacing: .5px;
  color: rgba(255, 255, 255, 0.3);
}

header.is-solid .logo { opacity: 1; }
header.is-solid .site-title,
header.is-solid .site-tagline { color: #fff; }

/* 右：PC用ナビ */
.site-nav { max-width: 1200px; }
.site-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav .nav-list a {
  position: relative;
  display: block;
  padding: .5rem 1rem;
  text-decoration: none;
  font-weight: 700;
  color: #fff;
  transition: color .2s ease, opacity .25s ease;
  opacity: .2;
}

header.is-solid .site-nav .nav-list a { opacity: 1; }
.site-nav .nav-list a:hover,
.site-nav .nav-list a:focus-visible { opacity: 1; color: #14829F; }

.site-nav .nav-list a::before {
  content: "";
  position: absolute;
  inset: 3px 0;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0);
  transform: scale(.96);
  opacity: 0;
  transition: background .18s ease, transform .18s ease, opacity .18s ease;
  z-index: -1;
}
.site-nav .nav-list a:hover::before,
.site-nav .nav-list a:focus-visible::before {
  background: #fff;
  opacity: 1;
  transform: scale(1);
}

/* モバイル用トグル（PCでは非表示） */
.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  position: absolute;
  top: 1rem;
  right: 1rem;
  z-index: 4000;
}

/* ---------- 768px以下：スマホ化 ---------- */
@media (max-width: 768px) {
  /* ハンバーガーボタンの表示・スタイル */
  .nav-toggle {
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    top: .75rem;
    width: 44px;
    height: 44px;
    -webkit-tap-highlight-color: transparent;
  }
  .nav-toggle .hamburger {
    position: relative;
    display: block;
    width: 26px;
    height: 2px;
    margin: 0 auto;
    background: #fff;
    border-radius: 2px;
    transition: transform .2s ease, background .2s ease;
  }
  .nav-toggle .hamburger::before,
  .nav-toggle .hamburger::after {
    content: "";
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: transform .2s ease, top .2s ease, opacity .2s ease;
    will-change: transform;
  }
  .nav-toggle .hamburger::before { transform: translateY(0px); }
  .nav-toggle .hamburger::after { transform: translateY(5px); }

  /* 開いたとき（X形） */
  .nav-toggle[aria-expanded="true"] .hamburger { background: transparent; }
  .nav-toggle[aria-expanded="true"] .hamburger::before { transform: rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .hamburger::after { transform: rotate(-45deg); }
  .nav-toggle[aria-expanded="true"] ~ .site-nav .nav-list a { color: #fff !important; opacity: 1 !important; }

  /* スマホ用ナビ（全画面） */
  header .site-nav {
    display: none;
  }
  header .site-nav.active {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 3200;
  }
  header .site-nav.active::before {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, .45);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
  }
  header .site-nav.active .nav-list {
    position: absolute;
    top: 0;
    right: 0;
    height: 100dvh;
    margin: 0;
    padding: 72px 24px 24px;
    flex-direction: column;
    gap: 10px;
    background-color: rgba(20, 130, 159, 0.9);
    color: #fff;
    overflow-y: auto;
  }
  header .site-nav .nav-list a {
    font-size: 1rem;
    padding: 12px 10px;
    border-radius: 10px;
    opacity: 1; /* PCの薄い初期状態を解除 */
  }
  header .site-nav .nav-list a:active,
  header .site-nav .nav-list a:hover {
    background: rgba(0, 0, 0, .06);
  }
}