:root{--bg:#f6f7fb;--card:#fff;--text:#172033;--muted:#667085;--brand:#2563eb;--ok:#16a34a;--bad:#dc2626;--line:#e5e7eb}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;padding-bottom:84px}header{padding:22px 18px 8px;max-width:980px;margin:auto}.headrow{display:flex;justify-content:space-between;gap:16px;align-items:flex-start}h1{font-size:24px;margin:0 0 6px}header p{margin:0;color:var(--muted)}.identity{min-width:230px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px;display:grid;grid-template-columns:1fr auto;gap:6px;align-items:center}.identity span{grid-column:1/-1;font-size:12px;color:var(--muted)}.identity input{border:1px solid var(--line);border-radius:10px;padding:9px 10px;font-size:14px;min-width:0}.identity button{width:auto;margin:0;padding:9px 12px}.identity small{grid-column:1/-1;color:var(--muted);font-size:11px;word-break:break-all}main{max-width:980px;margin:auto;padding:10px 14px}.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:8px 0 14px}.stat,.panel{background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:0 8px 24px #1118270a}.stat{padding:14px}.stat b{display:block;font-size:24px;margin-bottom:4px}.stat span{color:var(--muted);font-size:13px}.panel{padding:16px;margin-bottom:14px}.grid{display:grid;grid-template-columns:1fr 1.25fr 1fr 1fr auto;gap:10px;align-items:end}label{font-size:13px;color:var(--muted)}select,button{width:100%;margin-top:6px;border:1px solid var(--line);border-radius:12px;background:#fff;padding:11px 12px;font-size:15px}button{background:var(--brand);color:#fff;border-color:var(--brand);font-weight:700;cursor:pointer}.ghost{background:#fff;color:var(--brand)}.qtop{display:flex;justify-content:space-between;align-items:center;gap:10px;color:var(--muted)}#fav{width:auto;min-width:96px}h2{font-size:20px;line-height:1.55}.options{display:grid;gap:10px}.option{border:1px solid var(--line);border-radius:14px;padding:13px 14px;background:#fff;display:flex;gap:10px;align-items:flex-start}.option.selected{border-color:var(--brand);background:#eff6ff}.option .key{font-weight:800;color:var(--brand);min-width:24px}.judge{grid-template-columns:1fr 1fr}.result{margin-top:14px;border-radius:14px;padding:14px;background:#f8fafc;border:1px solid var(--line);line-height:1.7}.learn{margin-top:10px;padding-top:10px;border-top:1px dashed #cbd5e1}.learn ol{margin:8px 0 0 20px;padding:0}.learn li{margin:7px 0}.result.ok{border-color:#86efac;background:#f0fdf4}.result.bad{border-color:#fecaca;background:#fef2f2}.hidden{display:none}.tag{display:inline-block;border-radius:999px;padding:2px 9px;background:#eef2ff;color:#3730a3;margin:2px 4px 2px 0;font-size:12px}.bottom{position:fixed;left:0;right:0;bottom:0;background:#ffffffee;backdrop-filter:blur(10px);border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr 1fr 1fr;gap:8px;padding:10px max(10px,env(safe-area-inset-left)) calc(10px + env(safe-area-inset-bottom));z-index:10}.bottom button{margin:0;padding:12px 8px}.bottom button:nth-child(1),.bottom button:nth-child(3),.bottom button:nth-child(4){background:#fff;color:var(--brand)}@media(max-width:900px){.grid{grid-template-columns:1fr 1fr}.headrow{flex-direction:column}.identity{width:100%}}@media(max-width:760px){.stats{grid-template-columns:repeat(2,1fr)}.grid{grid-template-columns:1fr}.stat b{font-size:22px}h2{font-size:18px}.panel{border-radius:14px;padding:14px}.bottom{grid-template-columns:1fr 1fr 1fr 1fr}.bottom button{font-size:13px}}@media(min-width:761px){.bottom{max-width:980px;left:50%;transform:translateX(-50%);border:1px solid var(--line);border-bottom:0;border-radius:18px 18px 0 0}}