:root{color:#1c241f;background:#d9cbb3;font-family:PingFang SC,Hiragino Sans GB,Noto Sans SC,Source Han Sans SC,Microsoft YaHei,sans-serif;line-height:1.5}*{box-sizing:border-box}body{margin:0;min-height:100dvh}button,input{font:inherit;color:inherit}button{cursor:pointer}a{color:inherit}.shell{width:min(480px,100%);min-height:100dvh;margin:0 auto;display:flex;flex-direction:column;background:#f6f1e6;border-top:4px solid #9c2f2f;box-shadow:0 0 0 1px #14332f0f,0 18px 50px #30200a1f}#app{flex:1}.page{padding:16px 16px 24px}.hero{margin:-16px -16px 16px;padding:28px 20px 22px;background:#14332f;color:#f6f1e6}.seal{display:inline-grid;place-items:center;width:36px;height:36px;border:1px solid rgba(243,226,194,.7);color:#f3e2c2;font-family:Songti SC,"Noto Serif SC",serif;letter-spacing:0}.hero h1,.page h1,.stem{font-weight:650;letter-spacing:0}.hero h1{margin:12px 0 6px;font-size:28px}.hero p{margin:0;color:#f6f1e6d1}.banner,.card,.continue-card,.chapter-card,.explain,.stat{background:#fffdf8;border:1px solid #eadfcd;border-radius:16px}.banner,.card,.continue-card,.chapter-card{padding:16px}.banner{margin-bottom:12px}.stack{display:grid;gap:12px}.eyebrow{margin:0 0 4px;color:#8a5a22;font-size:13px}.subject-card h2,.continue-card h2,.chapter-name{margin:0;font-size:18px}.blurb,.muted,.source,.chapter-brief{color:#5c675f}.blurb,.meta,.chapter-brief{margin:6px 0 0}.meta{font-size:14px}.subject-card[data-subject=shiwu]{border-top:4px solid #14332f}.subject-card[data-subject=jingji]{border-top:4px solid #a56b2a}.continue-card{display:block;text-decoration:none;border-left:4px solid #9c2f2f}.btn{display:flex;align-items:center;justify-content:center;width:100%;min-height:48px;margin-top:12px;padding:0 14px;border:0;border-radius:14px;background:#14332f;color:#f6f1e6;text-decoration:none;font-size:16px}.btn.ghost{background:transparent;color:#14332f;border:1px solid #cbbfa8}.btn:disabled{opacity:.45;cursor:default}.back{display:inline-block;margin-bottom:8px;color:#0c5c56;text-decoration:none}.chapter-card{display:block;text-decoration:none}.bar{height:6px;margin-top:10px;border-radius:99px;background:#efe4d2;overflow:hidden}.bar>span{display:block;height:100%;background:#14332f}.kicker{margin:0 0 8px;color:#8a5a22;font-size:13px}.stem{margin:0 0 14px;font-size:18px;line-height:1.65;white-space:pre-wrap}.progress-label{margin:0;font-size:14px;color:#5c675f}.options{display:grid;gap:10px}.option{width:100%;min-height:56px;padding:12px 14px;border:1.5px solid #e4d8c4;border-radius:14px;background:#fffdf8;text-align:left;line-height:1.45}.option.is-selected{border-color:#14332f;background:#e7f1ef}.option.is-right{border-color:#1b7a45;background:#e7f6ee}.option.is-wrong{border-color:#a3262c;background:#fdeeee}.option:disabled{opacity:1;cursor:default}.explain{margin-top:14px;padding:14px}.explain h3{margin:0 0 8px;font-size:16px}.explain p{margin:0;line-height:1.7}.explain .source{margin-top:10px;font-size:13px}.explain.is-correct{background:#e7f6ee;border-color:#b7e0c8}.explain.is-wrong{background:#fdeeee;border-color:#f0c4c4}.practice-bar{position:sticky;bottom:0;display:grid;gap:10px;padding:10px 0 calc(12px + env(safe-area-inset-bottom));background:linear-gradient(#f6f1e600,#f6f1e6 18%)}.split{display:grid;grid-template-columns:1fr 1fr;gap:10px}.split .btn,.practice-bar .btn{margin-top:0}.big-score{margin:8px 0;font-size:64px;line-height:1;font-weight:700}.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.stat{padding:12px;text-align:center}.stat b{display:block;font-size:20px}.stat span{color:#5c675f;font-size:13px}.wrong-list{margin:8px 0 0;padding-left:20px}.wrong-list li{margin:8px 0}.tabs{display:grid;grid-template-columns:1fr 1fr;gap:8px}.tabs button{min-height:44px;border-radius:12px;border:1px solid #e4d8c4;background:transparent}.tabs button.is-on{background:#14332f;color:#f6f1e6;border-color:#14332f}.field{display:grid;gap:6px;margin-top:12px;font-size:14px}.field input{min-height:48px;padding:0 12px;border:1px solid #d9cbb3;border-radius:12px;background:#fff;font-size:16px}.error-text{min-height:1.4em;margin:8px 0 0;color:#a3262c}.disclaimer{margin:16px 0 0;color:#5c675f;font-size:13px}.loading,.empty{display:grid;justify-items:center;gap:12px;padding:48px 12px;text-align:center}.spinner{width:28px;height:28px;border:3px solid #e4d8c4;border-top-color:#14332f;border-radius:50%;animation:spin .8s linear infinite}#tabbar{position:sticky;bottom:0;display:grid;grid-template-columns:1fr 1fr;background:#fffdf8;border-top:1px solid #eadfcd;padding-bottom:env(safe-area-inset-bottom)}#tabbar[hidden]{display:none}#tabbar a{min-height:52px;display:grid;place-items:center;text-decoration:none;color:#5c675f}#tabbar a[aria-current=page]{color:#14332f;font-weight:700}#toast{position:fixed;left:50%;bottom:calc(84px + env(safe-area-inset-bottom));z-index:5;max-width:min(90vw,420px);padding:12px 16px;border-radius:999px;background:#1c241f;color:#f6f1e6;opacity:0;pointer-events:none;transform:translate(-50%) translateY(8px);transition:.2s ease}#toast.show{opacity:1;transform:translate(-50%) translateY(0)}:focus-visible{outline:2px solid #a56b2a;outline-offset:2px}@media(prefers-reduced-motion:reduce){.spinner{animation:none}#toast{transition:none}}@keyframes spin{to{transform:rotate(360deg)}}
