/* 通分トレーニング — テーマ干渉を避けるため .tsukun- でスコープ */
.tsukun-training{
  --panel:#fff;--ink:#1e293b;--line:#cbd5e1;--accent:#3b82f6;--ok:#059669;
  --bad:#dc2626;--muted:#64748b;--warning:#d97706;--info:#0891b2;
  --radius:16px;--shadow:0 12px 32px rgba(0,0,0,.08);--soft-blue:#f1f5f9;--hover-blue:#e2e8f0;
  font-family:"Hiragino Kaku Gothic ProN","Noto Sans JP",system-ui,-apple-system,"Segoe UI",Roboto,Meiryo,sans-serif
}
.tsukun-body{padding:20px;background:linear-gradient(135deg,#334155,#1e293b);color:#fff;min-height:80vh;display:flex;align-items:center;justify-content:center;border-radius:12px}
.tsukun-app{width:min(1200px,96vw);background:var(--panel);color:var(--ink);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.tsukun-top{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:16px;flex-wrap:wrap}
.tsukun-badges{display:flex;gap:10px;flex-wrap:wrap}
.tsukun-badge{background:var(--accent);color:#fff;font-weight:700;padding:8px 14px;border-radius:999px;font-size:14px;box-shadow:0 2px 8px rgba(59,130,246,.3)}
.tsukun-badge.random{background:var(--warning)}
.tsukun-score{font-weight:700;font-size:16px}
.tsukun-stats{display:flex;gap:20px;margin-top:10px;font-size:14px;color:var(--muted);flex-wrap:wrap}
.tsukun-progress{background:#e2e8f0;height:6px;border-radius:3px;margin:12px 0;overflow:hidden}
.tsukun-progress-bar{background:var(--ok);height:100%;transition:width .4s ease;border-radius:3px}
.tsukun-board{display:grid;grid-template-columns:1fr 400px;gap:24px}
.tsukun-problem{background:#fff;border:2px solid var(--line);border-radius:16px;padding:28px;box-shadow:0 4px 16px rgba(0,0,0,.05)}
.tsukun-caption{font-weight:800;color:var(--ink);margin-bottom:16px;font-size:17px;text-align:center}
.tsukun-pair{display:flex;align-items:center;justify-content:center;gap:14px;margin:12px 0 16px;font-size:clamp(20px,2.8vw,32px);font-weight:900;flex-wrap:wrap}
.tsukun-paren,.tsukun-comma{color:#475569;font-weight:700}
.tsukun-comma{margin:0 .3em}
.tsukun-frac{display:inline-grid;grid-template-rows:auto auto;gap:6px;align-items:center;justify-items:center}
.tsukun-row{display:flex;align-items:center;gap:8px}
.tsukun-num,.tsukun-den{min-width:2em;text-align:center;font-weight:900}
.tsukun-bar{display:block;width:100%;height:0;border-top:4px solid #1e293b;border-radius:2px;margin:.05em 0;justify-self:stretch}
.tsukun-times{font-weight:900;padding:0 .15em;color:#64748b;font-size:.85em}
.tsukun-slot{display:inline-flex;align-items:center;justify-content:center;min-width:1.8em;padding:.15em .35em;border:2px dashed #94a3b8;border-radius:8px;font-weight:900;background:var(--soft-blue);color:var(--ink)}
.tsukun-slot:hover,.tsukun-slot.active{border-color:var(--accent);background:#dbeafe}
.tsukun-res{display:none;align-items:center;gap:10px;font-weight:900;color:#1e293b}
.tsukun-res.show{display:inline-flex}
.tsukun-pad{background:var(--soft-blue);border:2px solid var(--line);border-radius:16px;padding:20px}
.tsukun-keys{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:12px}
.tsukun-key{user-select:none;cursor:pointer;border:2px solid var(--line);background:#fff;padding:16px 12px;text-align:center;border-radius:12px;font-weight:700;font-size:20px;color:var(--ink)}
.tsukun-key.ok{background:var(--accent);color:#fff;border-color:var(--accent)}
.tsukun-key.fn{background:var(--info);color:#fff;border-color:var(--info)}
.tsukun-key.del{background:var(--bad);color:#fff;border-color:var(--bad)}
.tsukun-row2{display:grid;grid-template-columns:1fr 1fr 1fr 2fr;gap:10px}
.tsukun-feedback{text-align:center;font-weight:700;margin:12px 0;min-height:28px;font-size:16px}
.tsukun-feedback.ok{color:var(--ok)} .tsukun-feedback.bad{color:var(--bad)} .tsukun-feedback.info{color:var(--info)}
.tsukun-ctr{display:flex;justify-content:center;gap:16px;margin-top:16px;flex-wrap:wrap}
.tsukun-btn{background:#1e293b;color:#fff;border:none;border-radius:12px;padding:14px 24px;font-weight:700}
.tsukun-btn:disabled{opacity:.5;cursor:not-allowed}
.tsukun-controls{display:flex;gap:12px;margin-top:12px;align-items:center;flex-wrap:wrap}
.tsukun-control-label{font-size:13px;color:#334155;font-weight:700}
.tsukun-control-select{appearance:none;background:#fff url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12"><path d="M2 4l4 4 4-4" fill="%23334155"/></svg>') no-repeat right .7rem center/12px 12px;border:2px solid var(--line);border-radius:8px;padding:8px 32px 8px 14px;font-size:13px;font-weight:600;color:#334155}
@media (max-width:920px){
  .tsukun-board{grid-template-columns:1fr}
  .tsukun-pair{font-size:clamp(18px,3.5vw,28px)}
  .tsukun-app{padding:20px}
  .tsukun-problem{padding:24px 20px}
  .tsukun-pad{padding:16px}
}