:root,[data-theme=dark]{--bg: #0f172a;--panel: #1e293b;--panel-2: #334155;--text: #e2e8f0;--muted: #94a3b8;--accent: #6366f1;--accent-2: #8b5cf6;--ok: #22c55e;--ng: #ef4444;--border: #475569}[data-theme=light]{--bg: #f8fafc;--panel: #ffffff;--panel-2: #eef2f7;--text: #1e293b;--muted: #64748b;--accent: #4f46e5;--accent-2: #7c3aed;--ok: #16a34a;--ng: #dc2626;--border: #cbd5e1}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Hiragino Kaku Gothic ProN,Meiryo,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}button{font:inherit;cursor:pointer;border:none;border-radius:8px;padding:10px 16px;background:var(--accent);color:#fff;transition:opacity .15s}button:hover{opacity:.9}button:disabled{opacity:.4;cursor:not-allowed}button.secondary{background:var(--panel-2);color:var(--text)}button.danger{background:var(--ng);color:#fff;padding:6px 12px}.deck-header{display:flex;align-items:center;justify-content:space-between;gap:12px}.app{max-width:720px;margin:0 auto;padding:16px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:16px}.topbar h1{font-size:20px;margin:0}.card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:16px;margin-bottom:12px}.deck-list{display:grid;gap:10px}.deck-item{display:flex;align-items:center;justify-content:space-between;gap:12px}.deck-meta{font-size:13px;color:var(--muted)}.field{display:flex;align-items:center;gap:8px;margin:8px 0}.field label{min-width:120px;color:var(--muted)}select,input[type=number],input[type=text]{font:inherit;font-size:16px;padding:8px 12px;border-radius:8px;border:1px solid var(--border);background:var(--panel-2);color:var(--text);line-height:1.4}select{min-height:40px;padding-right:28px}input[type=number]{width:90px}.quiz{padding:16px}.quiz-compact{padding:4px}.quiz-compact .question{margin-bottom:4px}.quiz-compact .answer{margin-top:4px}.card:has(.quiz-compact){padding:4px}.quiz .question{font-size:18px;font-weight:600;margin-bottom:12px}.quiz .answer{font-size:16px;color:var(--accent-2);margin-top:8px}.quiz .answer .answer-body{display:block}.choices{display:grid;gap:8px;margin:12px 0}.choice{display:flex;align-items:center;gap:8px;padding:8px 10px;border:1px solid var(--border);border-radius:8px;background:var(--panel-2)}.choice.correct{border-color:var(--ok);border-width:3px}.choice.wrong{border-color:var(--ng);border-width:3px}.result.ok{color:var(--ok);font-weight:700}.result.ng{color:var(--ng);font-weight:700}.timerbar{font-variant-numeric:tabular-nums;color:var(--muted);font-size:13px}.ad{text-align:center;padding:16px}.ad img{max-width:100%;border-radius:12px}.ad .countdown{color:var(--muted);margin:12px 0;font-size:14px}.error{color:var(--ng);font-size:14px}.muted{color:var(--muted)}.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.terms-link{background:none;color:var(--accent);padding:4px 0;text-decoration:underline;font-size:13px}.terms-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:16px}.terms-modal{background:var(--panel);color:var(--text);border:1px solid var(--border);border-radius:12px;padding:16px;max-width:600px;max-height:80vh;overflow:auto;display:flex;flex-direction:column;gap:12px}.terms-text{white-space:pre-wrap;word-break:break-word;font-family:inherit;font-size:13px;line-height:1.7;margin:0}.signup-notice{background:var(--panel-2);border:1px solid var(--border);border-radius:8px;padding:10px 12px;margin-bottom:12px;font-size:13px;line-height:1.6;color:var(--text)}.account-danger{margin-top:24px}.lang-select{border-radius:8px;border:1px solid var(--border);background:var(--panel-2);color:var(--text)}.ad-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:1100;padding:16px}.ad-modal{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:16px;max-width:420px;width:100%}.tap-to-play-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1200;display:flex;align-items:center;justify-content:center;background:#0000008c;cursor:pointer;-webkit-tap-highlight-color:transparent}.tap-to-play-inner{background:var(--accent);color:#fff;font-size:18px;font-weight:700;padding:14px 22px;border-radius:12px;box-shadow:0 4px 16px #00000059;text-align:center}