:root{--bg: #f7f8fa;--card: #ffffff;--line: #e3e6ea;--text: #1f2430;--muted: #6b7280;--accent: #4f46e5;--accent-d: #4338ca;--due: #e8590c;--fresh: #2563eb;--done: #16a34a;--danger: #d92d20;font-family:system-ui,-apple-system,Segoe UI,Roboto,Hiragino Sans,Noto Sans JP,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);line-height:1.6}#app{max-width:760px;margin:0 auto;padding:16px 16px 64px}h1{font-size:1.4rem;margin:8px 0 2px}.sub{color:var(--muted);font-size:.85rem;margin:0 0 16px}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:16px}.card h2{font-size:1rem;margin:0}.card.center{text-align:center}.row{display:flex;gap:8px;align-items:center;margin-top:10px}.row.top{margin-top:0;margin-bottom:4px}.row.end{justify-content:flex-end}.row.center{justify-content:center}.row.between{justify-content:space-between}.card h2+.row,.row.between h2{margin:0}.row.between{margin-top:0;margin-bottom:12px}button{cursor:pointer;border:none;border-radius:8px;padding:9px 14px;font-size:.9rem;background:var(--accent);color:#fff;font-weight:600}button:hover{background:var(--accent-d)}button:disabled{background:#c7c9d1;cursor:default}button.ghost{background:transparent;color:var(--accent);border:1px solid var(--accent)}button.ghost:hover{background:#eef0ff}button.ghost.back{border-color:var(--line);color:var(--muted)}button.mini{padding:3px 10px;font-size:.8rem}button.danger{background:transparent;color:var(--danger);border:1px solid var(--danger)}button.danger:hover{background:#fdecea}button.wide{min-width:200px;padding:12px 14px}.grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}label{font-size:.78rem;color:var(--muted);display:block;margin-bottom:3px}input,select,textarea{width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:8px;font-size:.92rem;background:#fff;color:var(--text);font-family:inherit}textarea{resize:vertical}.full{grid-column:1 / -1}label.inline{display:inline-flex;align-items:center;gap:5px;color:var(--text);font-size:.85rem;margin-bottom:0}label.inline input{width:auto}.badges{display:flex;gap:8px;flex-wrap:wrap}.badge{flex:1 1 0;min-width:88px;text-align:center;border-radius:10px;padding:10px 6px;border:1px solid var(--line);background:#fff}.badge .num{font-size:1.5rem;font-weight:700;display:block}.badge .lbl{font-size:.72rem;color:var(--muted)}.badge.due .num{color:var(--due)}.badge.fresh .num{color:var(--fresh)}ul.decks,ul.cardlist{list-style:none;margin:8px 0 0;padding:0}li.deck{border:1px solid var(--line);border-radius:8px;padding:10px 12px;margin-bottom:8px;display:flex;align-items:center;gap:8px}li.deck .body{flex:1;min-width:0}li.deck .name{font-weight:600}.meta{font-size:.76rem;color:var(--muted);margin-top:2px}.tag{display:inline-block;font-size:.72rem;padding:1px 7px;border-radius:6px;background:#eef1f4;color:var(--muted);margin-right:4px}.tag.due{background:#fdf0e6;color:var(--due)}.tag.fresh{background:#e7effd;color:var(--fresh)}.tag.done{background:#e7f6ec;color:var(--done)}.actions{display:flex;gap:6px}li.ccard,li.pcard{border:1px solid var(--line);border-radius:8px;padding:8px 10px;margin-bottom:8px;display:flex;align-items:flex-start;gap:8px}li.ccard .body,li.pcard .body{flex:1;min-width:0}.front{font-weight:600;word-break:break-word}.back{color:var(--muted);font-size:.9rem;word-break:break-word}.preview{margin-top:12px;border-top:1px dashed var(--line);padding-top:10px}.counter{color:var(--muted);font-size:.85rem}.card.study{min-height:180px;display:flex;flex-direction:column;justify-content:center}.card.study hr{border:none;border-top:1px solid var(--line);width:100%;margin:14px 0}.face{text-align:center;word-break:break-word}.face.front{font-size:1.3rem;font-weight:600}.face.back{font-size:1.1rem;color:var(--text)}.big{font-size:1.05rem}.grades{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:12px}.grade{display:flex;flex-direction:column;align-items:center;gap:2px;padding:10px 4px;background:#fff;border:1px solid var(--line);color:var(--text)}.grade:hover{background:#f3f4f8}.grade .gl{font-weight:700;font-size:.92rem}.grade .gh{font-size:.65rem;color:var(--muted);font-weight:400}.grade.g-again{border-color:#f0b6b0}.grade.g-again .gl{color:var(--danger)}.grade.g-hard .gl{color:var(--due)}.grade.g-good .gl{color:var(--fresh)}.grade.g-easy .gl{color:var(--done)}details summary{cursor:pointer;font-weight:600;font-size:.95rem}.empty{color:var(--muted);text-align:center;padding:24px 0}.hint{font-size:.76rem;color:var(--muted);margin-top:6px}.warn{color:var(--danger);font-size:.82rem;margin-top:6px}footer{text-align:center;color:var(--muted);font-size:.74rem;margin-top:24px}footer a,.hint a{color:var(--accent)}@media(max-width:480px){.grid{grid-template-columns:1fr}.grade .gh{display:none}}