/* NEON GRID 共通スタイル */
:root{
  --bg:#0a0e1a; --panel:#101628; --panel2:#0c1220;
  --cyan:#00e5ff; --pink:#ff2d78; --amber:#ffb020; --green:#2dffa8; --purple:#a06bff;
  --text:#e8ecf5; --muted:#8a93ad; --line:rgba(0,229,255,.18);
}
*{margin:0;padding:0;box-sizing:border-box}
body{background:var(--bg);color:var(--text);font-family:'Noto Sans JP',sans-serif;line-height:1.75;
  background-image:linear-gradient(rgba(0,229,255,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,229,255,.04) 1px,transparent 1px);background-size:32px 32px;}
.wrap{max-width:760px;margin:0 auto;padding:0 16px 64px}
a{color:var(--cyan)}
/* 視覚的に非表示だが、クローラー / スクリーンリーダーには読まれる要素。
   ヒーローを持たないページで h1 を保持するために使う */
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;
  clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}
/* 共通ナビ */
.gnav{position:sticky;top:0;z-index:60;background:rgba(10,14,26,.94);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.gnav .inner{max-width:760px;margin:0 auto;padding:11px 16px;
  display:flex;align-items:center;justify-content:space-between;gap:14px}
.gnav .brand{font-family:'Chakra Petch';font-weight:700;font-size:15px;letter-spacing:.1em;
  color:var(--text);text-decoration:none;white-space:nowrap}
.gnav .brand span{color:var(--pink);text-shadow:0 0 12px rgba(255,45,120,.45)}
/* ハンバーガー */
.burger{width:34px;height:28px;border:1px solid var(--line);border-radius:2px;background:none;
  cursor:pointer;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:4px;padding:0}
.burger i{display:block;width:16px;height:1.5px;background:var(--cyan);transition:.22s}
.burger[aria-expanded="true"] i:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.burger[aria-expanded="true"] i:nth-child(2){opacity:0}
.burger[aria-expanded="true"] i:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}
/* ドロワー */
.drawer{position:fixed;inset:0;z-index:55;background:rgba(5,8,16,.72);
  backdrop-filter:blur(3px);opacity:0;pointer-events:none;transition:opacity .2s}
.drawer.open{opacity:1;pointer-events:auto}
.drawer .panelmenu{position:absolute;top:51px;right:0;left:0;margin:0 auto;max-width:760px;
  background:var(--panel);border-bottom:1px solid var(--line);
  padding:8px 16px 14px;transform:translateY(-8px);transition:transform .22s}
.drawer.open .panelmenu{transform:translateY(0)}
.drawer a{display:flex;align-items:center;justify-content:space-between;
  font-family:'Chakra Petch';font-size:14px;letter-spacing:.06em;text-decoration:none;
  color:var(--muted);padding:11px 4px;border-bottom:1px solid rgba(0,229,255,.08)}
.drawer a:last-child{border-bottom:none}
.drawer a.on{color:var(--cyan)}
.drawer a::after{content:"→";opacity:.35;font-size:12px}
.eyebrow{font-family:'Chakra Petch';font-size:11px;letter-spacing:.25em;color:var(--cyan);text-transform:uppercase}
h1{font-family:'Chakra Petch';font-size:clamp(24px,5.5vw,34px);font-weight:700;line-height:1.2;margin:6px 0 10px}
h1 .accent{color:var(--pink)}
h2{font-family:'Chakra Petch';font-size:17px;letter-spacing:.06em;color:var(--cyan);
  display:flex;align-items:center;gap:10px;margin-bottom:14px}
h2::after{content:"";flex:1;height:1px;background:var(--line)}
section{margin-top:36px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:16px;position:relative}
.panel::before,.panel::after{content:"";position:absolute;width:10px;height:10px;border-color:var(--cyan);border-style:solid}
.panel::before{top:-1px;left:-1px;border-width:2px 0 0 2px}
.panel::after{bottom:-1px;right:-1px;border-width:0 2px 2px 0}
.note{font-size:12px;color:var(--muted);margin-top:10px}
.mono{font-family:'Chakra Petch'}
footer{margin-top:52px;border-top:1px solid var(--line);padding-top:16px;font-size:12px;color:var(--muted)}
footer .disc{margin-top:8px}