:root{
  --bg:#f4efe6; --card:#fffdf8; --ink:#26211a; --sub:#6b6154; --line:#ddd2bd; --accent:#2f5d50; --accent-ink:#ffffff;
  --soft:#e7efe9; --danger:#a5352c; --ok:#2a7a50;
  --othello:#2f7d54; --othello-line:#1f5a3a;
  --go:#e2b96d; --go-line:#4a3b1f; --shogi:#e8c47a; --shogi-line:#5a431c;
  --piece:#f7e2a8; --piece-edge:#8a6a2a; --piece-ink:#201a10; --promo:#b3261e;
  --stone-b:#1b1814; --stone-w:#f6f1e4; --hint:rgba(255,255,255,.55); --sel:rgba(255,196,0,.55);
  --serif:"Hiragino Mincho ProN","Yu Mincho","Noto Serif JP",serif;
  --sans:"Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic",system-ui,sans-serif;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#16140f; --card:#211e17; --ink:#efe7d6; --sub:#a89d88; --line:#3a3425; --accent:#7cc2a6; --accent-ink:#10231c;
    --soft:#23332d; --danger:#ff8a7f; --ok:#6fd49c;
    --othello:#1d5a3a; --othello-line:#123d27;
    --go:#a98446; --go-line:#241b0b; --shogi:#a98846; --shogi-line:#2a1f0b;
    --piece:#d9bf82; --piece-edge:#4a3714; --piece-ink:#17120a; --promo:#a52019;
    --stone-b:#0c0b09; --stone-w:#e4ddca; --hint:rgba(255,255,255,.4); --sel:rgba(255,196,0,.5);
  }
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);-webkit-text-size-adjust:100%}
body{min-height:100dvh}
button{font:inherit;color:inherit}
#app{max-width:560px;margin:0 auto;padding:max(12px,env(safe-area-inset-top)) 16px max(24px,env(safe-area-inset-bottom))}
.serif{font-family:var(--serif)}
h1,h2,h3{font-family:var(--serif);margin:0;font-weight:700;letter-spacing:.02em}
.top{display:flex;align-items:center;gap:8px;min-height:44px;margin-bottom:8px}
.top h2{font-size:19px;flex:1;text-align:center}
.top .sp{width:44px}
.iconbtn{width:44px;height:44px;border:0;background:none;font-size:22px;color:var(--ink);border-radius:12px;cursor:pointer}
.iconbtn:active{background:var(--soft)}
.btn{border:1px solid var(--line);background:var(--card);border-radius:12px;padding:11px 14px;min-height:44px;font-size:15px;cursor:pointer}
.btn:active{background:var(--soft)}
.btn.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);font-weight:700}
.btn.danger{color:var(--danger)}
.btn[disabled]{opacity:.45;cursor:default}
.row{display:flex;gap:8px;flex-wrap:wrap}
.row>.btn{flex:1;min-width:0}
.sub{color:var(--sub);font-size:13px;line-height:1.6}

/* ホーム */
.hero{text-align:center;padding:18px 0 14px}
.hero h1{font-size:30px}
.hero p{margin:6px 0 0}
.cards{display:grid;gap:12px}
.gcard{display:grid;grid-template-columns:64px 1fr;gap:14px;align-items:center;padding:14px;border:1px solid var(--line);border-radius:16px;background:var(--card);text-align:left;cursor:pointer;width:100%}
.gcard:active{background:var(--soft)}
.gcard .ico{width:64px;height:64px;border-radius:14px;display:grid;place-items:center;font-family:var(--serif);font-size:30px;font-weight:700;color:#fff}
.gcard .ico.go{background:#8a6a2a}.gcard .ico.oth{background:var(--othello)}.gcard .ico.shogi{background:#9a4b1d}
.gcard h3{font-size:20px}
.gcard .meta{font-size:12.5px;color:var(--sub);margin-top:3px}
.resume{margin-top:8px;display:inline-block;font-size:13px;color:var(--accent);font-weight:700}
.foot{margin-top:22px;text-align:center}

/* せってい */
.panel{border:1px solid var(--line);background:var(--card);border-radius:16px;padding:14px;margin-bottom:12px}
.panel h3{font-size:16px;margin-bottom:8px}
.levels{display:grid;gap:6px}
.lv{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--bg);cursor:pointer;text-align:left;width:100%}
.lv[aria-pressed=true]{border-color:var(--accent);background:var(--soft);box-shadow:inset 0 0 0 1px var(--accent)}
.lv .num{font-family:var(--serif);font-weight:700;font-size:18px;width:22px;text-align:center}
.lv .nm{font-weight:700;font-size:15px}
.lv .ds{font-size:12px;color:var(--sub);margin-top:1px}
.lv .st{font-size:12px;letter-spacing:1px;color:var(--accent)}
.seg{display:flex;gap:6px;flex-wrap:wrap}
.seg button{flex:1;min-width:72px;padding:10px 8px;border:1px solid var(--line);border-radius:12px;background:var(--bg);cursor:pointer;font-size:14.5px}
.seg button[aria-pressed=true]{border-color:var(--accent);background:var(--soft);font-weight:700;box-shadow:inset 0 0 0 1px var(--accent)}
.stat{font-size:13px;color:var(--sub);margin-top:6px}

/* 対局 */
.bar{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:2px 0 8px;min-height:40px}
.pill{display:flex;align-items:center;gap:8px;padding:6px 10px;border-radius:12px;border:1px solid var(--line);background:var(--card);font-size:14px;min-width:0}
.pill.turn{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
.pill b{font-family:var(--serif);font-size:20px}
.dot{width:16px;height:16px;border-radius:50%;flex:none}
.dot.b{background:var(--stone-b);border:1px solid #8a8272} .dot.w{background:var(--stone-w);border:1px solid #888}
.msg{min-height:24px;text-align:center;font-size:14px;color:var(--sub);margin:6px 0}
.msg strong{color:var(--ink)}
.msg.warn{color:var(--danger)}
.think::after{content:"";display:inline-block;width:12px;height:12px;border:2px solid var(--accent);border-right-color:transparent;border-radius:50%;margin-left:8px;vertical-align:-2px;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.ctl{margin-top:10px}

/* オセロ */
.oboard{--s:min(100%,calc(100dvh - 300px));width:var(--s);aspect-ratio:1;margin:0 auto;display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);background:var(--othello);border:3px solid var(--othello-line);border-radius:6px;gap:1px;position:relative}
.oboard{min-width:260px;max-width:100%}
.ocell{position:relative;background:var(--othello);border:0;padding:0;box-shadow:0 0 0 .5px var(--othello-line);cursor:default}
.ocell.can{cursor:pointer}
.ocell.can::after{content:"";position:absolute;left:50%;top:50%;width:26%;height:26%;margin:-13% 0 0 -13%;border-radius:50%;background:rgba(255,255,255,.7)}
.ocell.last::before{content:"";position:absolute;left:50%;top:50%;width:14%;height:14%;margin:-7% 0 0 -7%;border-radius:50%;background:#e8523f;z-index:2}
.disc{position:absolute;inset:9%;border-radius:50%;box-shadow:0 1px 2px rgba(0,0,0,.45);transition:background-color .12s .12s}
.disc.b{background:var(--stone-b)}
.disc.w{background:var(--stone-w)}
.disc.flip{animation:flip .34s ease}
.disc.drop{animation:pop .2s ease-out}
@keyframes flip{0%{transform:scaleX(1)}50%{transform:scaleX(.06)}100%{transform:scaleX(1)}}
@keyframes pop{from{transform:scale(.3);opacity:0}to{transform:scale(1);opacity:1}}

/* 将棋 */
.sg{width:100%}
.shand{display:flex;gap:6px;align-items:center;min-height:50px;padding:4px 6px;border:1px dashed var(--line);border-radius:10px;margin:6px 0;flex-wrap:wrap}
.shand .lbl{font-size:12px;color:var(--sub);margin-right:4px}
.hp{position:relative;border:0;background:none;padding:0;width:38px;height:42px;cursor:pointer}
.hp .n{position:absolute;right:-2px;top:-4px;background:var(--accent);color:var(--accent-ink);border-radius:9px;min-width:17px;height:17px;font-size:11px;line-height:17px;text-align:center;font-weight:700}
.hp[aria-pressed=true]{outline:3px solid #ffc400;outline-offset:1px;border-radius:6px}
.hp.op{cursor:default}
.sgwrap{display:grid;grid-template-columns:minmax(0,1fr) 18px;grid-template-rows:16px minmax(0,1fr);gap:2px;width:100%;max-width:min(100%,calc(100dvh - 340px));margin:0 auto;min-width:290px}
.sgfiles{grid-column:1;grid-row:1;display:grid;grid-template-columns:repeat(9,1fr);font-size:11px;color:var(--sub);text-align:center;line-height:16px}
.sgranks{grid-column:2;grid-row:2;display:grid;grid-template-rows:repeat(9,1fr);font-size:11px;color:var(--sub);align-items:center;text-align:left;padding-left:2px}
.sboard{min-width:0;grid-column:1;grid-row:2;aspect-ratio:1;display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);background:var(--shogi);border:2px solid var(--shogi-line);box-shadow:0 1px 3px rgba(0,0,0,.2)}
.scell{position:relative;border:0;padding:0;background:none;box-shadow:inset 0 0 0 .5px var(--shogi-line);cursor:default;min-width:0}
.scell.can{cursor:pointer}
.scell.can::after{content:"";position:absolute;left:50%;top:50%;width:26%;height:26%;margin:-13% 0 0 -13%;border-radius:50%;background:rgba(40,100,60,.6);z-index:3}
.scell.cap::after{width:84%;height:84%;margin:-42% 0 0 -42%;background:none;border:3px solid rgba(190,40,30,.85);border-radius:8px}
.scell.sel{background:var(--sel)}
.scell.last{background:rgba(255,120,60,.28)}
.pc{position:absolute;inset:6% 9%;display:grid;place-items:center;font-family:var(--serif);font-weight:700;color:var(--piece-ink);background:var(--piece-edge);clip-path:polygon(50% 0,86% 13%,100% 100%,0 100%,14% 13%);font-size:clamp(14px,5.4vw,26px);line-height:1}
.pc::before{content:"";position:absolute;inset:2px;background:var(--piece);clip-path:polygon(50% 0,86% 13%,100% 100%,0 100%,14% 13%)}
.pc>span{position:relative;top:8%;z-index:1}
.pc.promo{color:var(--promo)}
.pc.rot{transform:rotate(180deg)}
.hp .pc{inset:0;font-size:22px}
.star{position:absolute;width:5px;height:5px;border-radius:50%;background:var(--shogi-line);z-index:1}
.check{color:var(--danger);font-weight:700}

/* 囲碁 */
.gowrap{width:100%;max-width:min(100%,calc(100dvh - 320px));margin:0 auto;min-width:290px}
.gosvg{display:block;width:100%;height:auto;touch-action:manipulation;border-radius:6px;box-shadow:0 1px 4px rgba(0,0,0,.25)}
.score{display:grid;gap:4px;font-size:14px}
.score .line{display:flex;justify-content:space-between;gap:12px}
.score .big{font-family:var(--serif);font-size:19px;margin-top:4px}

/* ダイアログ・お知らせ */
.ovl{position:fixed;inset:0;background:rgba(0,0,0,.45);display:grid;place-items:center;padding:20px;z-index:50}
.dlg{background:var(--card);border-radius:18px;padding:20px;max-width:360px;width:100%;box-shadow:0 8px 30px rgba(0,0,0,.35)}
.dlg h3{font-size:20px;margin-bottom:8px}
.dlg p{margin:6px 0 14px;line-height:1.7;font-size:15px;white-space:pre-line}
.dlg .row{flex-direction:column}
.toast{position:fixed;left:50%;bottom:max(24px,env(safe-area-inset-bottom));transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:20px;font-size:14px;z-index:60;max-width:90vw;text-align:center}

/* 広告の枠・同意・規約のページ(広告がOFFのあいだは出ない) */
.adslot{margin:18px 0 6px;min-height:100px;border:1px dashed var(--line);border-radius:12px;display:grid;place-items:center;color:var(--sub);font-size:12px}
.legal{max-width:560px;margin:0 auto;padding:max(12px,env(safe-area-inset-top)) 16px 40px;line-height:1.85;font-size:15px}
.legal h1{font-size:24px;margin:10px 0 4px}.legal h2{font-size:17px;margin:22px 0 4px}
.legal p,.legal li{margin:6px 0}.legal ul{padding-left:20px}
.legal a{color:var(--accent)}.legal .meta{color:var(--sub);font-size:13px}
.foot a{color:var(--sub)}
.langbar{display:flex;gap:4px;justify-content:flex-end;margin:0 0 4px}
.langbar button{border:1px solid var(--line);background:var(--card);border-radius:10px;padding:6px 10px;min-height:34px;font-size:13px;cursor:pointer}
.langbar button[aria-pressed=true]{border-color:var(--accent);background:var(--soft);font-weight:700}
.pc.lat{font-family:var(--sans);font-size:clamp(11px,4.2vw,20px)}
.hp .pc.lat{font-size:15px}
.ocell.hintmv{box-shadow:inset 0 0 0 3px #2f7dd1}
.scell.hfrom{background:rgba(47,125,209,.28)}
.scell.hto{box-shadow:inset 0 0 0 3px #2f7dd1}
.ctl{flex-wrap:wrap}
.dlg{max-height:86vh;overflow:auto}
.share{display:flex;gap:8px;margin:18px 0 0}.share .btn{flex:1;text-align:center;text-decoration:none;color:var(--ink);padding:10px 6px;font-size:14px}
.install{display:flex;align-items:center;gap:6px;margin:14px 0 0;padding:4px 4px 4px 10px;border:1px dashed var(--line);border-radius:12px;font-size:13px}