/* ===== サイト共通の地とヘッダー（トップ／登場人物／使い方の3種すべてがこれを読む）=====
   ページ側のCSSより後に読み込む前提。ヘッダーと地の柄をここ以外に書かないこと。 */

/* ===== 地の柄（全ページ共通）=====
   ネオンのグリッドと光を敷きっぱなしにして、上に乗るパネルは半透明のまま。
   これで「どのページも同じ床の上に立っている」感じになる。 */
.site-bg {
  position: fixed; inset: -8%; z-index: -1; pointer-events: none;
  background:
    radial-gradient(900px 620px at 84% -8%, rgba(168,85,247,.20), transparent 62%),
    radial-gradient(820px 600px at -8% 18%, rgba(0,229,255,.15), transparent 62%),
    radial-gradient(720px 520px at 68% 92%, rgba(255,79,160,.11), transparent 62%);
}
.site-bg::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0,229,255,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,255,.055) 1px, transparent 1px);
  background-size: 56px 56px;
  /* 中央から外へ薄れる。全面に敷くと文字の邪魔になる */
  mask-image: radial-gradient(ellipse 86% 66% at 50% 26%, #000 18%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 86% 66% at 50% 26%, #000 18%, transparent 78%);
  animation: gridDrift 26s linear infinite;
}
/* 1マスぶん動いて元に戻る＝つなぎ目の見えない無限スクロール */
@keyframes gridDrift { to { transform: translate3d(56px, 56px, 0); } }
/* 走査線が上から下へゆっくり抜ける */
.site-bg::after {
  content: ""; position: absolute; left: 0; right: 0; height: 42%;
  background: linear-gradient(180deg, transparent, rgba(0,229,255,.045) 62%, transparent);
  animation: sweep 14s ease-in-out infinite;
}
@keyframes sweep {
  0% { transform: translateY(-45%); opacity: 0; }
  18% { opacity: 1; }
  82% { opacity: 1; }
  100% { transform: translateY(240%); opacity: 0; }
}

/* ===== ヘッダー =====
   スマホは「ロゴ＋メニューボタン」だけにして、行き先はパネルで見せる。
   ナビに項目を並べると幅が足りず、詰め込んだ小さな文字が並ぶ（以前の作り）。 */

.site-head {
  /* 棒（バー）は置かない。ロゴとメニューだけを画面の隅に浮かせる。
     場所を取らないので、どのページも中身が画面のいちばん上から始まる。 */
  position: fixed; top: 0; left: 0; right: 0; height: 0; z-index: 60;
  background: none; border: 0; pointer-events: none;
}
.site-head .nav { height: 0; padding: 0; }
.site-head .nav-links { display: none; }
.site-head .logo {
  /* 囲みは付けない。アイコンと文字だけを置いて、影で背景から浮かせる */
  position: fixed; top: 14px; left: max(16px, calc(50% - 560px + 22px));
  display: inline-flex; align-items: center; gap: 10px; pointer-events: auto;
  text-decoration: none; color: #fff;
  transition: opacity .3s ease, transform .3s ease;
}
.site-head .appicon {
  width: 28px; height: 28px; border-radius: 9px; display: block;
  box-shadow: 0 4px 16px rgba(0,0,0,.6), 0 0 0 1px rgba(255,255,255,.1);
}
/* ロゴタイプは公式ロゴの文字部分（scripts/build_logotype.py で白抜きにしたもの）。
   フォントで組み直さないこと＝字形が別物になる */
.site-head .logotype { height: 17px; width: auto; display: block; filter: drop-shadow(0 2px 10px rgba(0,0,0,.85)); }
.foot-logo img { height: 21px; width: auto; opacity: .9; }
/* 先頭にいるときだけ出す（スクロールしたら画面を広く使う） */
.site-head.stuck .logo { opacity: 0; transform: translateY(-8px); pointer-events: none; }

/* ハンバーガー（スマホのみ） */
.nav-toggle {
  display: inline-flex; position: fixed; top: 12px; right: 14px; z-index: 61; pointer-events: auto;
  width: 42px; height: 42px; padding: 0; margin-right: -6px;
  align-items: center; justify-content: center;
  background: rgba(10,10,20,.55); border: 1px solid rgba(255,255,255,.16);
  border-radius: 13px; cursor: pointer; -webkit-tap-highlight-color: transparent;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.nav-toggle .bars { position: relative; display: block; width: 17px; height: 11px; }
.nav-toggle .bars::before, .nav-toggle .bars::after {
  content: ""; position: absolute; left: 0; width: 100%; height: 2px; border-radius: 2px;
  background: #eef0ff; transition: transform .26s cubic-bezier(.4,0,.2,1), top .18s ease .1s;
}
.nav-toggle .bars::before { top: 0; }
.nav-toggle .bars::after { top: 9px; }
.nav-toggle[aria-expanded="true"] .bars::before,
.nav-toggle[aria-expanded="true"] .bars::after { top: 4.5px; transition: top .18s ease, transform .26s cubic-bezier(.4,0,.2,1) .12s; }
.nav-toggle[aria-expanded="true"] .bars::before { transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .bars::after { transform: rotate(-45deg); }

/* メニューパネル */
.nav-panel {
  position: fixed; inset: 0; z-index: 59; display: flex; flex-direction: column; justify-content: center;
  padding: 84px 26px 34px;
  background: rgba(5,5,12,.86);
  backdrop-filter: blur(22px) saturate(1.2); -webkit-backdrop-filter: blur(22px) saturate(1.2);
  opacity: 0; visibility: hidden; transition: opacity .26s ease, visibility .26s;
}
.nav-panel::before {                       /* パネルにもネオンの気配を残す */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(600px 380px at 90% 0%, rgba(168,85,247,.20), transparent 65%),
    radial-gradient(520px 340px at 0% 100%, rgba(0,229,255,.16), transparent 62%);
}
.nav-panel.open { opacity: 1; visibility: visible; }
.nav-panel a { position: relative; text-decoration: none; color: var(--text); }
.nav-panel .items { display: grid; gap: 2px; }
.nav-panel .items a {
  display: flex; align-items: baseline; gap: 12px;
  padding: 17px 4px; font-size: 21px; font-weight: 900; letter-spacing: .02em;
  border-bottom: 1px solid rgba(255,255,255,.08);
  opacity: 0; transform: translateY(14px);
}
.nav-panel.open .items a { opacity: 1; transform: none; transition: opacity .4s ease, transform .4s cubic-bezier(.2,.8,.3,1); }
.nav-panel.open .items a:nth-child(1) { transition-delay: .06s; }
.nav-panel.open .items a:nth-child(2) { transition-delay: .11s; }
.nav-panel.open .items a:nth-child(3) { transition-delay: .16s; }
.nav-panel.open .items a:nth-child(4) { transition-delay: .21s; }
.nav-panel .items i {
  font-family: var(--en); font-style: normal; font-size: 10.5px; font-weight: 700;
  letter-spacing: .22em; color: var(--cyan); opacity: .8; text-transform: uppercase;
}
.nav-panel .items a[aria-current] { color: var(--cyan); }
.nav-panel .items a::after {
  content: "→"; margin-left: auto; font-size: 15px; color: var(--dim); transform: translateX(-2px);
}
.nav-panel .panel-cta {
  margin-top: 26px; text-align: center; padding: 17px 20px; border-radius: 17px;
  font-weight: 900; font-size: 15.5px; color: #05060e !important;
  background: linear-gradient(135deg, var(--cyan) 0%, #4f7dff 55%, var(--purple) 100%);
  box-shadow: 0 12px 34px rgba(79,125,255,.35);
  opacity: 0; transform: translateY(14px);
}
.nav-panel.open .panel-cta { opacity: 1; transform: none; transition: opacity .4s ease .26s, transform .4s cubic-bezier(.2,.8,.3,1) .26s; }
.nav-panel .panel-cta small { display: block; font-size: 11px; font-weight: 800; opacity: .75; margin-top: 2px; }
.nav-panel .panel-foot {
  display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: center;
  margin-top: 24px; font-size: 12px; font-weight: 700;
}
.nav-panel .panel-foot a { color: var(--dim); }

@media (max-width: 780px) {
  .site-head .logo { top: 12px; left: 16px; gap: 8px; }
  .site-head .appicon { width: 25px; height: 25px; border-radius: 8px; }
  .site-head .logotype { height: 15px; }
  /* スマホでは細かい注意書きを出さない（読ませる場所ではない） */
  .foot-caution { display: none; }
}
@media (min-width: 781px) {
  .nav-panel { padding: 96px 32px 40px; }
  .nav-panel .items, .nav-panel .panel-cta { max-width: 560px; width: 100%; margin-left: auto; margin-right: auto; }
  .nav-toggle { top: 16px; right: max(16px, calc(50% - 560px + 22px)); }
}
@media (prefers-reduced-motion: reduce) {
  .site-bg::before, .site-bg::after { animation: none !important; }
  .nav-panel, .nav-panel .items a, .nav-panel .panel-cta { transition: none !important; }
  .nav-panel .items a, .nav-panel .panel-cta { opacity: 1; transform: none; }
}