:root{--bg:#f6f8fb;--card:#fff;--ink:#1f2937;--muted:#6b7280;--primary:#4f46e5;--primary-2:#7c3aed;--good:#16a34a;--bad:#dc2626;--warn:#d97706;--line:#e5e7eb}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Segoe UI,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.container{max-width:720px;margin:0 auto;padding:16px 16px 96px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;position:-webkit-sticky;position:sticky;top:0;z-index:10;background:rgba(246,248,251,.92);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}.topbar .brand{font-weight:700;font-size:17px}.topbar .brand .en{color:var(--primary)}.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;box-shadow:0 1px 2px rgba(0,0,0,.04)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;border-radius:12px;padding:12px 16px;font-size:16px;font-weight:600;cursor:pointer;background:var(--primary);color:#fff;transition:transform .06s,opacity .12s}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn.ghost{background:#eef0ff;color:var(--primary)}.btn.good{background:var(--good)}.btn.bad{background:var(--bad)}.btn.warn{background:var(--warn)}.btn.block{width:100%}.btn.sm{padding:8px 12px;font-size:14px;border-radius:10px}h1{font-size:22px;margin:8px 0 4px}h2{font-size:18px;margin:16px 0 8px}.muted{color:var(--muted);font-size:13px}.center{text-align:center}.grid2{display:grid;grid-template-columns:1fr 1fr;grid-gap:10px;gap:10px}.grid3{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:8px;gap:8px}.day-grid{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:10px;gap:10px}@media (max-width:420px){.day-grid{grid-template-columns:repeat(3,1fr)}}.day-cell{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px 6px;text-align:center;cursor:pointer;position:relative}.day-cell.active{border-color:var(--primary);background:#eef0ff}.day-cell .dn{font-weight:700;font-size:15px}.day-cell .dp{font-size:11px;color:var(--muted);margin-top:2px}.day-cell.done{background:#ecfdf5;border-color:#bbf7d0}.wordpic{display:block;margin:8px auto 4px;max-width:220px;max-height:150px;object-fit:contain;border-radius:12px}.bigword{font-size:34px;font-weight:800;letter-spacing:.5px;padding:24px 8px 8px}.bigword,.bigzh{text-align:center}.bigzh{font-size:22px;color:#374151;margin-top:4px}.phon{text-align:center;font-size:17px;color:var(--primary);letter-spacing:.5px;margin-top:2px}.progressbar{height:8px;border-radius:999px;background:#e5e7eb;overflow:hidden}.progressbar>div{height:100%;background:linear-gradient(90deg,var(--primary),var(--primary-2));border-radius:999px;transition:width .3s}.pill{display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:600}.pill.green{background:#dcfce7;color:#166534}.pill.gray{background:#e5e7eb;color:#374151}.tabs{display:flex;gap:8px;margin:12px 0}.tabs .tab{flex:1 1;text-align:center;padding:10px 4px;border-radius:12px;font-weight:600;background:#eef0ff;color:var(--primary);cursor:pointer;font-size:15px;border:1px solid transparent}.tabs .tab.on{background:var(--primary);color:#fff}.option{display:block;width:100%;text-align:left;padding:13px 14px;margin:8px 0;border:1px solid var(--line);border-radius:12px;background:#fff;cursor:pointer;font-size:16px}.option.correct{border-color:var(--good);background:#ecfdf5}.option.wrong{border-color:var(--bad);background:#fef2f2}table.report{width:100%;border-collapse:collapse;font-size:14px}table.report td,table.report th{padding:8px 6px;border-bottom:1px solid var(--line);text-align:left}table.report th{color:var(--muted);font-weight:600;font-size:12px}.stat{text-align:center}.stat .n{font-size:26px;font-weight:800}.stat .l{font-size:12px;color:var(--muted)}.footer-nav{position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);display:flex;z-index:20}.footer-nav a,.footer-nav button{flex:1 1;padding:12px 4px;text-align:center;font-size:13px;font-weight:600;color:var(--muted);background:none;border:none;cursor:pointer}.footer-nav .on{color:var(--primary)}input[type=password],input[type=text]{width:100%;padding:12px;border:1px solid var(--line);border-radius:12px;font-size:16px;outline:none}input:focus{border-color:var(--primary)}.kid-card{text-align:center;padding:20px 10px;cursor:pointer;border:1px solid var(--line);border-radius:16px;background:#fff}.kid-card .emoji{font-size:44px}.kid-card .nm{font-weight:700;font-size:17px;margin-top:6px}.audio-btn{display:inline-flex;align-items:center;gap:6px;cursor:pointer;border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 14px;font-size:14px}