:root{--bg: #f4f7ff;--card: #ffffff;--ink: #23305e;--muted: #7b86a8;--primary: #4f7cff;--primary-ink: #ffffff;--good: #2fbf71;--bad: #ff6b6b;--radius: 22px;--shadow: 0 8px 24px rgba(45, 70, 160, .12);font-family:system-ui,-apple-system,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--ink)}.screen{max-width:560px;margin:0 auto;min-height:100dvh;padding:max(24px,env(safe-area-inset-top)) 20px calc(24px + env(safe-area-inset-bottom));display:flex;flex-direction:column}.home-head{text-align:center;margin:32px 0 40px}.logo{font-size:40px;margin:0}.tagline{color:var(--muted);font-size:18px;margin:8px 0 0}.home-actions{display:flex;flex-direction:column;gap:18px;flex:1;justify-content:center}.big-btn{display:flex;align-items:center;gap:18px;width:100%;padding:26px 28px;border:none;border-radius:var(--radius);background:var(--card);color:var(--ink);box-shadow:var(--shadow);font-size:24px;font-weight:700;cursor:pointer;transition:transform .08s ease}.big-btn:active{transform:scale(.97)}.big-btn.primary{background:var(--primary);color:var(--primary-ink)}.big-btn-emoji{font-size:34px}.home-foot{margin-top:32px;text-align:center;min-height:20px}.status{font-size:13px;color:var(--muted)}.status.bad{color:var(--bad)}.link-btn{background:none;border:none;color:var(--primary);font-size:17px;padding:6px 4px;cursor:pointer;white-space:nowrap}.muted{color:var(--muted)}.big-btn{position:relative}.big-btn-label{flex:1;text-align:left}.badge{min-width:34px;height:34px;padding:0 10px;border-radius:17px;background:var(--bad);color:#fff;font-size:18px;display:inline-flex;align-items:center;justify-content:center}.big-btn.primary .badge{background:#fff;color:var(--primary)}.badge.ghost{background:#eef1fb;color:var(--muted)}.topbar{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:16px}.topbar-title{margin:0;font-size:20px}.card-form{display:flex;flex-direction:column;gap:12px;background:var(--card);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);margin-bottom:18px}.fld-row{display:flex;gap:12px}.fld{flex:1;width:100%;padding:14px 16px;border:2px solid #e6eaf6;border-radius:14px;font-size:17px;background:#fafbff;color:var(--ink)}.fld:focus{outline:none;border-color:var(--primary)}.check{display:flex;align-items:center;gap:10px;font-size:16px;color:var(--muted)}.check input{width:22px;height:22px}.btn-solid{padding:16px;border:none;border-radius:14px;background:var(--primary);color:#fff;font-size:18px;font-weight:700;cursor:pointer}.btn-solid:disabled{opacity:.6}.card-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}.empty{color:var(--muted);text-align:center;padding:40px 20px;line-height:1.6}.card-row{display:flex;align-items:center;gap:10px;background:var(--card);border-radius:16px;padding:14px 16px;box-shadow:var(--shadow)}.card-row-main{display:flex;flex-direction:column;gap:2px;min-width:0;flex:1}.card-row-word{font-size:19px;font-weight:700}.card-row-cn{font-size:14px;color:var(--muted)}.card-row-meta{display:flex;flex-direction:column;gap:4px;align-items:flex-end}.tag{font-size:12px;color:var(--primary);background:#eef2ff;border-radius:8px;padding:3px 8px;white-space:nowrap}.tag.ghost{color:var(--muted);background:#f1f3f9}.del-btn{border:none;background:none;color:var(--muted);font-size:18px;padding:8px;cursor:pointer}.screen.center{align-items:center;justify-content:center;text-align:center;gap:8px}.finish-emoji{font-size:72px}.finish-actions{margin-top:24px;display:flex;flex-direction:column;gap:14px;align-items:center}.finish-actions .btn-solid{padding:16px 40px}.review-top{display:flex;align-items:center;justify-content:space-between}.progress{font-size:16px;font-weight:700;color:var(--muted)}.progress-bar{height:8px;background:#e6eaf6;border-radius:4px;overflow:hidden;margin:10px 0 4px}.progress-fill{height:100%;background:var(--primary);border-radius:4px;transition:width .25s ease}.flash-area{flex:1;display:flex;align-items:center;justify-content:center;padding:16px 0;min-height:0}.flash{width:100%;background:var(--card);border-radius:28px;box-shadow:var(--shadow);padding:32px 24px;display:flex;flex-direction:column;align-items:center;gap:14px;position:relative}.flash-front{min-height:320px;justify-content:center}.flash-word{font-size:52px;font-weight:800;color:var(--ink);text-align:center;word-break:break-word}.flash-phonetic{font-size:22px;color:var(--muted)}.speak-btn{margin-top:12px;width:64px;height:64px;border-radius:50%;border:none;background:#eef2ff;font-size:28px;cursor:pointer}.speak-btn:active{transform:scale(.94)}.speak-btn-sm{border:none;background:#eef2ff;border-radius:50%;width:34px;height:34px;font-size:16px;cursor:pointer;vertical-align:middle}.flash-back{align-items:stretch;text-align:center}.flash-word-sm{font-size:24px;font-weight:800;display:flex;align-items:center;justify-content:center;gap:10px}.flash-img{width:100%;max-height:220px;object-fit:contain;border-radius:18px;background:#f4f7ff}.flash-cn{font-size:30px;font-weight:800;color:var(--ink)}.flash-en{font-size:17px;color:var(--muted);line-height:1.5}.flash-ex{margin-top:6px;padding-top:14px;border-top:1px dashed #e0e5f2;display:flex;flex-direction:column;gap:6px}.flash-ex-en{font-size:18px;color:var(--ink);line-height:1.5;display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap}.flash-ex-cn{font-size:15px;color:var(--muted)}.flip-btn{margin-top:8px}.grade-row{display:flex;gap:14px;margin-top:8px}.grade{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;padding:20px 0;border:none;border-radius:20px;font-size:20px;font-weight:800;color:#fff;cursor:pointer}.grade span{font-size:18px}.grade.know{background:var(--good)}.grade.dont{background:var(--bad)}.grade:active{transform:scale(.97)}.grade:disabled{opacity:.6}.small{font-size:13px}.spinner{width:48px;height:48px;border:5px solid #e6eaf6;border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;margin-bottom:16px}@keyframes spin{to{transform:rotate(360deg)}}.file-drop{display:flex;flex-direction:column;align-items:center;gap:8px;padding:28px;border:2px dashed #c9d3f0;border-radius:16px;background:#fafbff;color:var(--muted);font-size:16px;cursor:pointer}.file-drop input{display:none}.file-drop-emoji{font-size:40px}.cand-list{list-style:none;margin:12px 0 0;padding:0;display:flex;flex-direction:column;gap:10px}.cand{background:var(--card);border-radius:16px;padding:12px 14px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:8px}.cand.off{opacity:.45}.cand-head{display:flex;align-items:center;gap:8px}.cand-head>input[type=checkbox]{width:22px;height:22px;flex-shrink:0}.cand-word{flex:1;min-width:0;border:none;font-size:19px;font-weight:800;color:var(--ink);background:transparent;padding:4px 2px}.cand-word:focus{outline:none;border-bottom:2px solid var(--primary)}.cand-ph{font-size:13px;color:var(--muted);white-space:nowrap}.cand-concrete{display:flex;align-items:center;gap:4px;font-size:13px;color:var(--muted);white-space:nowrap}.cand-concrete input{width:18px;height:18px}.fld.sm{padding:9px 12px;font-size:15px;border-width:1px}.sticky-confirm{position:sticky;bottom:12px;margin-top:16px;box-shadow:var(--shadow)}.filter-bar{display:flex;flex-direction:column;gap:10px;margin-bottom:14px}.seg{display:flex;flex-wrap:wrap;gap:8px}.seg-btn{border:1px solid #dbe2f5;background:#fff;color:var(--muted);border-radius:999px;padding:8px 16px;font-size:15px;font-weight:600;cursor:pointer}.seg-btn.on{background:var(--primary);border-color:var(--primary);color:#fff}.review-level{padding:12px;font-size:16px}.level-chip{background:#eef2ff;color:var(--primary);border-radius:999px;padding:4px 12px;font-size:14px;font-weight:700}.login-box{width:100%;max-width:340px;background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:36px 28px;text-align:center}.login-box .logo{font-size:48px}.login-box h2{margin:8px 0 4px}.login-form{display:flex;flex-direction:column;gap:14px;margin-top:20px}.cand-img-row{display:flex;align-items:center;gap:10px}.cand-img{width:72px;height:72px;object-fit:cover;border-radius:12px;background:#f4f7ff}.swap-btn{border:1px solid #e0e5f2;background:#fafbff;color:var(--muted);border-radius:10px;padding:8px 12px;font-size:14px;cursor:pointer}