:root{--bg: #f6f6f6;--glass: rgba(255, 255, 255, .6);--card-stroke: rgba(0,0,0,.08);--ok: rgba(0, 200, 0, .14);--bad: rgba(255, 0, 0, .14)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,PingFang SC,Noto Sans CJK SC,Microsoft YaHei,sans-serif;background:radial-gradient(1200px 600px at 20% 10%,#dfeaff 0,transparent 60%),radial-gradient(1000px 800px at 80% 15%,#f7dfff 0,transparent 60%),radial-gradient(900px 700px at 85% 85%,#ffe9df 0,transparent 60%),var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.container{max-width:980px;margin:0 auto;padding:16px}.toolbar{position:sticky;bottom:0;display:flex;gap:12px;justify-content:space-between;padding:8px 0;background:linear-gradient(180deg,transparent,rgba(255,255,255,.85));backdrop-filter:blur(10px);margin-top:8px}button{padding:10px 14px;border-radius:12px;border:1px solid rgba(0,0,0,.1);background:#fff;cursor:pointer;font-size:14px}button[disabled]{opacity:.5;cursor:not-allowed}.button-primary{background:#0a66ff;color:#fff;border-color:#0a66ff}.row{display:flex;gap:12px;align-items:center}.grow{flex:1 1 auto}.center{text-align:center}.card{width:100%;height:280px;padding:20px;border-radius:24px;background:var(--glass);backdrop-filter:blur(15px);border:2px solid var(--card-stroke);display:flex;flex-direction:column;gap:12px;overflow:hidden}.card.correct{background:linear-gradient(var(--ok),var(--ok)),var(--glass);border-color:#00a00099}.card.wrong{background:linear-gradient(var(--bad),var(--bad)),var(--glass);border-color:#dc000099}input[type=text],input[type=number]{width:100%;padding:12px 14px;border-radius:16px;border:1px solid rgba(0,0,0,.1);background:#ffffffb3;backdrop-filter:blur(10px);outline:none;font-size:16px}input[type=text]::placeholder{color:#888}hr{border:none;height:1px;background:#0000000f;margin:6px 0}.badge{display:inline-block;padding:2px 8px;border-radius:10px;background:#0000000f;font-size:12px;color:#666}.list{display:flex;flex-direction:column;gap:8px}.list-item{display:flex;gap:12px;align-items:baseline;padding:12px;border-radius:12px;background:#ffffffb3;border:1px solid rgba(0,0,0,.08)}.header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}@media (max-width: 640px){.row{flex-direction:column;align-items:stretch}.toolbar{position:static}.card{height:320px}}