:root{
  --bg:#0c0a10; --panel:#161320; --ink:#f3ecdf; --muted:#9a93a6;
  --gold:#d8b44a; --gold-hi:#f2cd68; --vermilion:#e0523d; --line:rgba(216,180,74,.28);
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;background:var(--bg);color:var(--ink);
  font-family:"OnimureMincho","Zen Kaku Gothic New","Hiragino Kaku Gothic ProN",system-ui,sans-serif;
  -webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent}
body{display:flex;flex-direction:column;align-items:center}

.topbar{width:100%;max-width:960px;display:flex;align-items:center;justify-content:space-between;
  padding:8px 12px;gap:12px}
.back{color:var(--muted);text-decoration:none;font-size:14px}
.back:hover{color:var(--ink)}
.audio-ctl{display:flex;align-items:center;gap:8px}
.top-right{display:flex;align-items:center;gap:14px}
.lang-toggle{display:inline-flex;gap:2px;border:1px solid var(--line);border-radius:999px;padding:2px;background:rgba(0,0,0,.25)}
.lang-toggle button{appearance:none;border:0;background:transparent;color:var(--muted);cursor:pointer;
  font:inherit;font-size:12px;font-weight:700;padding:3px 10px;border-radius:999px;line-height:1}
.lang-toggle button[aria-pressed="true"]{background:var(--gold);color:#1a150a}

#stage{position:relative;width:100%;max-width:960px;aspect-ratio:3/2;flex-shrink:0;
  background:#000;border:1px solid var(--line);border-radius:12px;overflow:hidden;
  box-shadow:0 10px 40px rgba(0,0,0,.5)}
@media(max-width:760px){
  #stage{aspect-ratio:auto;height:min(74vh,640px)}
}
#cv{position:absolute;inset:0;width:100%;height:100%;display:block;
  image-rendering:pixelated;image-rendering:crisp-edges;touch-action:none}

/* HUD */
.hud{position:absolute;inset:0;pointer-events:none;padding:10px;display:flex;flex-direction:column;
  justify-content:space-between;font-variant-numeric:tabular-nums}
.hud-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.hp{width:46%;max-width:320px;height:16px;background:rgba(0,0,0,.5);border:1px solid rgba(255,255,255,.15);
  border-radius:8px;overflow:hidden}
.hp-fill{height:100%;width:100%;background:linear-gradient(90deg,#e0523d,#f2765f);transition:width .12s}
.hud-stats{display:flex;gap:16px;font-size:21px;font-weight:800;
  text-shadow:0 1px 3px #000}
#hud-time{color:var(--ink)}#hud-kills{color:var(--gold)}
.xp{position:relative;height:22px;background:rgba(0,0,0,.5);border:1px solid rgba(216,180,74,.3);
  border-radius:10px;overflow:hidden}
.xp-fill{height:100%;width:0%;background:linear-gradient(90deg,#d8b44a,#f2cd68);transition:width .18s}
.xp-lv{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  font-size:13px;font-weight:800;color:#1a150a;letter-spacing:.06em}

/* overlays */
.overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:safe center;
  gap:12px;text-align:center;padding:20px 24px;background:rgba(8,6,12,.72);backdrop-filter:blur(3px);z-index:5;
  overflow-y:auto;overscroll-behavior:contain}
.overlay.hidden{display:none}
.title{font-size:clamp(38px,9vw,72px);margin:0;letter-spacing:.14em;color:var(--vermilion);font-weight:900;
  text-shadow:0 0 28px rgba(224,82,61,.55),0 3px 0 #4a1712}
.sub{margin:0;color:var(--ink);font-size:17px;opacity:.9}
.hint{margin:6px 0 0;color:var(--muted);font-size:14px;line-height:1.7}
.hint b{color:var(--gold);font-weight:700}
.btn-main{margin-top:6px;padding:14px 40px;font-size:18px;font-weight:800;color:#1a150a;cursor:pointer;
  border:0;border-radius:999px;background:linear-gradient(180deg,var(--gold-hi),#d8a838);
  box-shadow:0 6px 20px rgba(216,180,74,.35);letter-spacing:.08em}
.btn-main:hover{filter:brightness(1.06)}
.btn-main:active{transform:translateY(1px)}

.lv-title{font-size:27px;margin:0 0 6px;color:var(--gold);letter-spacing:.08em}
.lv-choices{display:flex;gap:14px;flex-wrap:wrap;justify-content:center;max-width:720px}
.lv-card{width:210px;min-height:176px;padding:20px 16px;cursor:pointer;text-align:center;
  background:var(--panel);border:1px solid var(--line);border-radius:14px;transition:.12s}
.lv-card:hover{border-color:var(--gold);transform:translateY(-3px);box-shadow:0 8px 24px rgba(0,0,0,.4)}
.lv-ico{font-size:48px;line-height:1;height:60px;display:flex;align-items:center;justify-content:center}
.lv-ico-img{width:58px;height:58px;object-fit:contain;image-rendering:pixelated;image-rendering:crisp-edges}
@media(max-width:760px){.lv-ico-img{width:44px;height:44px}}
.lv-name{font-size:20.5px;font-weight:800;margin:9px 0 2px}
.lv-tag{font-size:13.5px;color:var(--gold);font-weight:700;letter-spacing:.05em}
.lv-desc{font-size:15px;color:var(--muted);margin-top:7px;line-height:1.5}
@media(max-width:760px){.lv-card{width:160px;min-height:150px;padding:14px 11px}.lv-ico{font-size:38px;height:48px}}
.lv-card.banishable{border-color:var(--vermilion)}
.lv-card.banishable:hover{background:rgba(224,82,61,.14)}
.lv-ctrl{display:flex;gap:12px;margin-top:8px}
.lv-btn{padding:11px 22px;font-size:15px;font-weight:700;color:var(--ink);cursor:pointer;
  border:1px solid var(--line);border-radius:999px;background:rgba(0,0,0,.25);transition:.12s}
.lv-btn:hover:not(:disabled){border-color:var(--gold);color:var(--gold-hi)}
.lv-btn:disabled{opacity:.35;cursor:not-allowed}
.lv-btn.armed{border-color:var(--vermilion);color:var(--vermilion);background:rgba(224,82,61,.12)}
.lv-btn b{color:var(--gold)}
.btn-ico{width:22px;height:22px;object-fit:contain;vertical-align:-5px;image-rendering:pixelated;image-rendering:crisp-edges}

/* ビルドHUD */
.hud-bottom{display:flex;flex-direction:column;gap:7px}
.hud-build{display:flex;flex-wrap:wrap;gap:5px;pointer-events:none}
.bi{display:inline-flex;align-items:center;gap:3px;padding:3px 7px;border-radius:7px;
  background:rgba(0,0,0,.42);border:1px solid rgba(255,255,255,.1);font-size:16px;line-height:1}
.bi-img{width:24px;height:24px;object-fit:contain;vertical-align:-2px;image-rendering:pixelated;image-rendering:crisp-edges}
.bi.evo{border-color:var(--gold);background:rgba(216,180,74,.2)}
.bi-lv{font-size:13px;font-weight:800;color:var(--gold-hi)}
.bi.pass{opacity:.9}.bi.pass .bi-lv{color:var(--muted)}

/* ショップ（永続強化） */
.shop-wrap{margin-top:14px;width:100%;max-width:560px}
.shop-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.shop-title{font-size:16.5px;color:var(--gold);font-weight:700;letter-spacing:.04em}
.shop-gold{font-size:19px;font-weight:800;color:var(--gold-hi);font-variant-numeric:tabular-nums}
.shop{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
.shop-item{background:var(--panel);border:1px solid var(--line);border-radius:11px;padding:11px 8px;
  text-align:center;cursor:pointer;transition:.12s}
.shop-item:hover:not(.maxed):not(.locked){border-color:var(--gold);transform:translateY(-2px)}
.shop-item.locked{opacity:.5;cursor:not-allowed}
.shop-item.maxed{border-color:var(--gold);cursor:default}
.si-ico{font-size:28px;line-height:1;height:40px;display:flex;align-items:center;justify-content:center}
.si-ico-img{width:40px;height:40px;object-fit:contain;image-rendering:pixelated;image-rendering:crisp-edges}
.si-ico .coin-ico{width:28px;height:38px;background-size:84px auto;vertical-align:0}
.si-name{font-size:15.5px;font-weight:700;margin:4px 0 1px}
.si-desc{font-size:12.5px;color:var(--muted);line-height:1.4;min-height:32px}
.si-lv{font-size:12px;color:var(--gold);letter-spacing:.04em}
.si-cost{font-size:14px;font-weight:800;color:var(--gold-hi);margin-top:4px}
.si-cost.max{color:var(--gold)}
@media(max-width:760px){.shop{grid-template-columns:repeat(2,1fr)}.shop-wrap{max-width:340px}}
#hud-gold{color:var(--gold-hi)}
/* 小判アイコン（余白の多い画像からコイン部分だけを切り出し） */
.coin-ico{display:inline-block;width:19px;height:26px;vertical-align:-6px;
  background:url("../assets/img/koban_transparent_full.png") no-repeat 50% 48%;
  background-size:56px auto;image-rendering:pixelated;image-rendering:crisp-edges}
.si-cost .coin-ico,.shop-gold .coin-ico{width:16px;height:22px;vertical-align:-4px;background-size:48px auto}

.over-title{font-size:34px;margin:0;color:var(--vermilion);letter-spacing:.1em}
.over-build{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;max-width:380px;margin:2px 0}
.over-build .bi{font-size:18px;padding:4px 8px}
.over-result{margin:0;font-size:17px;line-height:1.9}
.over-result b{color:var(--gold);font-size:22px}
.over-best{margin:0;color:var(--muted);font-size:13px}
/* 説明セクション（SEO・オンボーディング） */
.about{width:100%;max-width:780px;margin:26px auto 4px;padding:0 20px;text-align:left;
  color:var(--muted);line-height:1.9;font-size:16px}
.about h2{color:var(--gold-hi);font-size:23px;letter-spacing:.05em;margin:0 0 8px;
  border-bottom:1px solid var(--line);padding-bottom:8px}
.about h3{color:var(--gold);font-size:17.5px;letter-spacing:.04em;margin:22px 0 5px}
.about p{margin:0 0 4px}
.credit{color:var(--muted);font-size:11px;margin:18px 0 22px;opacity:.7;text-align:center}