:root{--bg:#faf6ef;--card:#ffffff;--ink:#2d2a26;--ink-soft:#6b645c;--brand:#c4632a;--brand-dark:#a34f1e;--brand-light:#f5e3d3;--ok:#2e7d32;--danger:#c62828;--border:#e5ddd1;--radius:20px}*{box-sizing:border-box;margin:0;padding:0}html{font-size:20px}body{background:var(--bg);color:var(--ink);font-family:PingFang SC,Microsoft YaHei,Noto Sans SC,system-ui,sans-serif;font-size:1.05rem;line-height:1.9;min-height:100vh}.page{max-width:860px;margin:0 auto;padding:2.5rem 1.5rem 4rem}.btn-main{display:inline-block;width:100%;max-width:420px;padding:1.1rem 2rem;font-size:1.35rem;font-weight:600;color:#fff;background:var(--brand);border:none;border-radius:18px;cursor:pointer;transition:transform .1s,background .2s}.btn-main:hover{background:var(--brand-dark)}.btn-main:active{transform:scale(.98)}.btn-main:disabled{background:#c9bfb2;cursor:not-allowed}.btn-main.secondary{background:#fff;color:var(--brand-dark);border:2px solid var(--brand)}.btn-main.secondary:hover{background:var(--brand-light)}.voice-wrap{text-align:center;margin:.5rem 0 1.2rem}.voice-btn{width:104px;height:104px;border-radius:50%;border:none;background:linear-gradient(145deg,#e0864d,#b9572a);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;margin:0 auto;box-shadow:0 10px 26px rgba(196,99,42,.4),inset 0 2px 5px rgba(255,255,255,.28);transition:transform .15s,box-shadow .2s;position:relative}.voice-btn:hover{background:linear-gradient(145deg,#eb925a,#c4632a)}.voice-btn:active{transform:scale(.95)}.voice-btn:disabled{opacity:.6;cursor:not-allowed}.voice-btn .mic-icon{width:42px;height:42px}.voice-btn.recording{background:linear-gradient(145deg,#e05a4d,#c22e2e);animation:pulse 1.4s infinite}.voice-btn.recording:after{content:"";position:absolute;inset:-6px;border-radius:50%;border:3px solid rgba(198,40,40,.45);animation:ring 1.4s ease-out infinite}@keyframes ring{0%{transform:scale(.85);opacity:1}to{transform:scale(1.25);opacity:0}}@keyframes pulse{0%,to{box-shadow:0 10px 26px rgba(198,40,40,.45),inset 0 2px 5px rgba(255,255,255,.25)}50%{box-shadow:0 10px 34px rgba(198,40,40,.7),inset 0 2px 5px rgba(255,255,255,.25)}}.voice-label{margin-top:.9rem;font-size:1.1rem;font-weight:600;color:var(--ink)}.voice-label.on{color:var(--danger)}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1.8rem;margin-bottom:1.5rem}.question{font-size:1.7rem;font-weight:700;line-height:1.6;color:var(--ink);margin:1rem 0 1.5rem;text-align:center}.progress-track{width:100%;height:16px;background:#ede4d6;border-radius:8px;overflow:hidden;margin:1rem 0 .5rem}.progress-fill{height:100%;background:var(--brand);border-radius:8px;transition:width .4s ease}.progress-label{font-size:.95rem;color:var(--ink-soft);text-align:center;margin-bottom:1.5rem}textarea.answer-input{width:100%;min-height:110px;font-size:1.15rem;line-height:1.8;padding:.9rem 1rem;border:2px solid var(--border);border-radius:14px;background:#fffdf9;color:var(--ink);resize:vertical;font-family:inherit}textarea.answer-input:focus{outline:3px solid var(--brand-light);border-color:var(--brand)}.answer-history{margin-top:1.5rem;padding-top:1.2rem;border-top:1px dashed var(--border)}.answer-history h3{font-size:1rem;color:var(--ink-soft);margin-bottom:.8rem}.history-item{padding:.7rem 0;border-bottom:1px solid #f2ebe0}.history-item .q{font-size:1rem;color:var(--brand-dark);font-weight:600}.history-item .a{font-size:1.02rem;color:var(--ink);margin-top:.2rem}.book-chapter{margin-bottom:2.2rem}.book-chapter h2{font-size:1.5rem;color:var(--brand-dark);border-bottom:3px solid var(--brand-light);padding-bottom:.5rem;margin-bottom:1rem}.book-chapter p{margin-bottom:1rem;text-align:justify}.book-title{font-size:2.2rem;font-weight:800;text-align:center;color:var(--brand-dark);margin:.5rem 0 .2rem}.book-sub{margin-bottom:2.5rem}.book-sub,.hint{text-align:center;color:var(--ink-soft)}.hint{font-size:.95rem;margin-top:1rem}.action-row{display:flex;gap:1rem;justify-content:center;margin-top:1.5rem}.error-box{background:#fdecea;color:var(--danger);border-radius:12px;padding:.9rem 1.2rem;margin-bottom:1.2rem;font-size:1.05rem;text-align:center}.badge{display:inline-block;background:var(--brand-light);color:var(--brand-dark);border-radius:999px;padding:.25rem .9rem;font-size:.95rem;font-weight:600}.steps{display:flex;justify-content:center;gap:1.5rem;margin:1.5rem 0;flex-wrap:wrap}.step{text-align:center;font-size:1.02rem;color:var(--ink-soft)}.step b{display:block;font-size:1.6rem;color:var(--brand);margin-bottom:.2rem}@media print{.no-print{display:none!important}body{background:#fff}.page{max-width:100%;padding:0}}@media (max-width:640px){html{font-size:18px}.page{padding:1.2rem .9rem 3rem}.card{padding:1.3rem 1rem;border-radius:16px}.question{font-size:1.5rem}.book-title{font-size:1.9rem}.book-sub{font-size:.95rem}.btn-main{font-size:1.2rem;padding:1rem 1.5rem;border-radius:15px}.btn-main,.btn-main.secondary{max-width:100%}.voice-btn{width:112px;height:112px}.voice-btn .mic-icon{width:46px;height:46px}textarea.answer-input{font-size:1.05rem;min-height:96px}.steps{gap:.6rem}.step{font-size:.92rem}.step b{font-size:1.4rem}.history-item .q{font-size:.95rem}.history-item .a{font-size:1rem}.badge,.progress-label{font-size:.9rem}.book-chapter h2{font-size:1.3rem}.hint{font-size:.9rem}input[placeholder]{font-size:1rem}.action-row{flex-direction:column}.action-row .btn-main{width:100%;max-width:100%}}