:root{--red: #b91c1c;--red-dark: #8a1515;--bg: #f5f5f4;--card: #ffffff;--text: #1c1917;--muted: #78716c;--line: #e7e5e4;--ok: #15803d;--err: #b91c1c}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{margin:0;height:100%}body{font-family:-apple-system,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);font-size:17px;line-height:1.6}.app{max-width:560px;margin:0 auto;min-height:100%;background:var(--bg);padding-bottom:72px}.topbar{background:var(--red);color:#fff;padding:14px 16px;font-size:18px;font-weight:600;display:flex;align-items:center;gap:10px;position:sticky;top:0;z-index:10}.topbar .back{cursor:pointer;font-size:20px}.wrap{padding:16px}.card{background:var(--card);border-radius:12px;padding:16px;margin-bottom:12px;border:1px solid var(--line)}.card.click{cursor:pointer}.card.click:active{background:#fafaf9}.muted{color:var(--muted);font-size:15px}.big-num{font-size:30px;font-weight:700;color:var(--red)}.btn{display:block;width:100%;padding:14px;border:none;border-radius:10px;background:var(--red);color:#fff;font-size:17px;font-weight:600;cursor:pointer}.btn:disabled{opacity:.5}.btn.ghost{background:#fff;color:var(--red);border:1px solid var(--red)}.btn.gray{background:#f0f0ef;color:var(--text);border:1px solid var(--line)}.input{width:100%;padding:13px;border:1px solid var(--line);border-radius:10px;font-size:17px;margin-bottom:12px;background:#fff}.row{display:flex;gap:10px}.row>*{flex:1}.tag{display:inline-block;font-size:13px;padding:2px 8px;border-radius:6px;background:#f0f0ef;color:var(--muted)}.tag.done{background:#dcfce7;color:var(--ok)}.opt{border:1px solid var(--line);border-radius:10px;padding:13px;margin-bottom:10px;cursor:pointer;background:#fff;display:flex;gap:10px;align-items:flex-start}.opt.sel{border-color:var(--red);background:#fef2f2}.opt.correct{border-color:var(--ok);background:#f0fdf4}.opt.wrong{border-color:var(--err);background:#fef2f2}.opt .k{font-weight:700}.tabbar{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:100%;max-width:560px;display:flex;background:#fff;border-top:1px solid var(--line)}.tabbar a{flex:1;text-align:center;padding:10px 0;font-size:13px;color:var(--muted);text-decoration:none}.tabbar a.active{color:var(--red);font-weight:600}.tabbar .ico{display:block;font-size:20px}.center{text-align:center}.analysis{background:#f5f5f4;border-radius:10px;padding:12px;margin-top:12px;font-size:15px}.hint{color:var(--ok);font-weight:600}.hint.bad{color:var(--err)}.admin{max-width:960px;margin:0 auto;padding:20px}.admin table{width:100%;border-collapse:collapse;background:#fff}.admin th,.admin td{border:1px solid var(--line);padding:8px 10px;text-align:left;font-size:14px}.admin th{background:#fafaf9}.tabs{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap}.tabs button{padding:8px 14px;border:1px solid var(--line);background:#fff;border-radius:8px;cursor:pointer}.tabs button.on{background:var(--red);color:#fff;border-color:var(--red)}.err-box{color:var(--err);font-size:14px;margin:8px 0;white-space:pre-wrap}.kpi-row{display:flex;gap:14px;flex-wrap:wrap;margin:4px 0 22px}.kpi{flex:1;min-width:150px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px}.kpi-num{font-size:30px;font-weight:800;color:var(--red);line-height:1.1}.kpi-label{color:var(--muted);font-size:14px;margin-top:6px}.kpi.soft .kpi-num{color:var(--text);font-weight:700}.admin h4{margin:22px 0 8px}.modal-mask{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;z-index:50;display:flex;align-items:center;justify-content:center;padding:20px}.modal{background:#fff;border-radius:14px;padding:22px;width:100%;max-width:380px;box-shadow:0 12px 40px #00000040}.modal label{display:block;font-size:14px;color:var(--muted)}.modal .input{margin-top:6px}.modal .row button{padding:12px}.read-progress{position:fixed;top:0;left:0;right:0;z-index:30;height:3px;background:#0000001f}.read-progress span{display:block;height:100%;background:#fff;transition:width .15s linear}.resume-tip{position:fixed;top:64px;left:50%;transform:translate(-50%);z-index:20;background:#1c1917e0;color:#fff;font-size:14px;padding:8px 16px;border-radius:20px;animation:tipfade .3s ease;max-width:90%}@keyframes tipfade{0%{opacity:0;transform:translate(-50%,-6px)}to{opacity:1;transform:translate(-50%)}}.imagebook img{display:block;width:100%;height:auto;background:#eee}