:root{--bg:#f8fafc;--fg:#0f172a;--muted:#64748b;--card:#fff;--line:#e2e8f0;--acc:#4f46e5;--up:#e11d48;--down:#16a34a;color:var(--fg);background:var(--bg);font-family:system-ui,-apple-system,Segoe UI,Microsoft JhengHei,PingFang TC,Noto Sans TC,Noto Sans CJK TC,sans-serif}*{box-sizing:border-box}body{margin:0}a{color:var(--acc)}.fl{font-family:Yu Gothic UI,Meiryo,Hiragino Sans,Noto Sans CJK JP,Noto Sans JP,system-ui,sans-serif}.top{color:#fff;z-index:5;background:#0f172a;align-items:center;gap:24px;padding:10px 24px;display:flex;position:sticky;top:0}.top nav{flex-wrap:wrap;gap:4px;display:flex}.top nav a{color:#cbd5e1;border-radius:8px;padding:6px 12px;text-decoration:none}.top nav a.active{color:#fff;background:#334155}main{max-width:1100px;margin:0 auto;padding:20px 24px 40px}footer{text-align:center;padding:16px}h1{margin:8px 0;font-size:24px}h2{margin:18px 0 8px;font-size:18px}.muted{color:var(--muted)}.small{font-size:13px}.row{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.between{justify-content:space-between}.center{text-align:center;justify-content:center}button,.btn,select,input{font:inherit;border:1px solid var(--line);cursor:pointer;color:inherit;background:#fff;border-radius:8px;padding:7px 12px}input{cursor:text}button:disabled{opacity:.6;cursor:default}.btn{text-decoration:none;display:inline-block}button.primary{background:var(--acc);color:#fff;border-color:var(--acc)}button.link{color:var(--acc);background:0 0;border:none}button.icon{background:#eef2ff;border:none;border-radius:50%;width:34px;height:34px;padding:0}button.icon.small{width:26px;height:26px;font-size:12px}.pill{background:#e2e8f0;border-radius:99px;margin-left:6px;padding:2px 8px;font-size:12px;display:inline-block}.pill.ok{background:#dcfce7}.pill.bad{background:#fee2e2}.pill.new{background:#e0e7ff}.pills{gap:4px;display:flex}.warn{color:#b45309;margin-left:6px}.banner{background:#fef9c3;border-radius:8px;padding:10px 14px}.grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:12px 0;display:grid}.tile{background:var(--card);border:1px solid var(--line);color:inherit;border-radius:14px;padding:16px;text-decoration:none;display:block;box-shadow:0 1px 2px #0000000a}.tile:hover{border-color:var(--acc)}.tile.done{background:#f0fdf4}.tile.srs{background:linear-gradient(135deg,#eef2ff,#fff)}.tile-h{margin-bottom:6px;font-weight:600}.tile-t{margin:6px 0;font-size:17px}.big{font-size:34px;font-weight:700}.huge{margin:12px 0;font-size:40px;font-weight:700}.daytabs{gap:6px;margin:8px 0;display:flex}.daytabs button.on,.seg button.on{background:var(--fg);color:#fff}.seg{display:flex}.seg button{border-radius:0}.seg button:first-child{border-radius:8px 0 0 8px}.seg button:last-child{border-radius:0 8px 8px 0}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;margin:10px 0;padding:14px}.lesson .block{background:var(--card);border:1px solid var(--line);border-radius:12px;margin:12px 0;padding:12px 16px}.block.opt{border-style:dashed}.crumb{color:var(--muted);font-size:13px}.lines{padding:0;list-style:none}.lines li{margin:8px 0}.lines .fl{font-size:18px}.tbl{border-collapse:collapse;width:100%}.tbl td,.tbl th{border-bottom:1px solid var(--line);text-align:left;padding:6px 8px}.tbl.vocab .fl{font-size:18px;font-weight:600}.quiz{border-left:4px solid var(--line);margin:10px 0;padding:8px 12px}.quiz.right{border-color:var(--down)}.quiz.wrong{border-color:var(--up)}.choices{flex-wrap:wrap;gap:8px;margin:6px 0;display:flex}.choices button.correct{border-color:var(--down);background:#dcfce7}.feedback{margin-top:6px}.okc{color:var(--down)}.badc{color:var(--up)}.footer{margin-top:20px}.check{padding:0;list-style:none}.check li{margin:6px 0}.flash{background:var(--card);border:1px solid var(--line);text-align:center;border-radius:16px;max-width:640px;min-height:260px;margin:14px auto;padding:28px}.grades{justify-content:center;gap:10px;display:flex}.grades button{flex-direction:column;min-width:110px;display:flex}.grades .g1{border-color:var(--up)}.grades .g4{border-color:var(--down)}.tags{text-align:left}.kana-char{font-family:Yu Gothic UI,Meiryo,Noto Sans CJK JP,sans-serif;font-size:110px;line-height:1.1}.big4 button{min-width:90px;font-size:22px}.flash input{text-align:center;width:280px;margin-top:12px;font-size:22px}.chartbox{width:100%;margin:8px 0}.legend i{width:12px;height:3px;margin:0 4px 3px 10px;display:inline-block}button.buy{background:var(--up);color:#fff;border-color:var(--up)}button.sell{background:var(--down);color:#fff;border-color:var(--down)}td.up{color:var(--up)}td.down{color:var(--down)}.bar-row{grid-template-columns:260px 1fr 60px;align-items:center;gap:10px;margin:6px 0;display:grid}.bar{background:#e2e8f0;border-radius:5px;height:10px;overflow:hidden}.bar div{background:var(--acc);height:100%}.heat{grid-template-rows:repeat(7,14px);grid-auto-flow:column;gap:3px;display:grid}.heat i{background:#e2e8f0;border-radius:3px;width:14px;height:14px}.heat .h1{background:#c7d2fe}.heat .h2{background:#818cf8}.heat .h3{background:#4338ca}.settings label{flex-wrap:wrap;align-items:center;gap:10px;margin:8px 0;display:flex}.settings section{border:1px solid var(--line);background:#fff;border-radius:12px;margin:12px 0;padding:8px 16px}