*{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,'PingFang SC','Helvetica Neue',Arial,sans-serif;color:#222;background:#faf8f4;line-height:1.7}
a{color:#7a3030;text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1400px;margin:0 auto;padding:2.5rem 2rem}
header{border-bottom:1px solid #d8cfb8;padding-bottom:1.5rem;margin-bottom:2rem}
header h1{font-size:1.8rem;font-weight:600;letter-spacing:.05em}
header .sub{color:#7a6a4a;margin-top:.3rem;font-size:.95rem}
.crumbs{font-size:.85rem;color:#8a7d5e;margin-bottom:1rem}
.crumbs a{color:#8a7d5e}
h2{font-size:1.3rem;font-weight:600;margin:2rem 0 1rem;color:#4a2a2a}
h3{font-size:1.1rem;font-weight:600;margin:1.5rem 0 .8rem}
.books{display:grid;grid-template-columns:repeat(auto-fill,minmax(360px,1fr));gap:1.5rem}
.book{background:#fff;border:1px solid #e0d6bc;border-radius:8px;padding:1.5rem;transition:transform .15s}
.book:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(0,0,0,.06)}
.book .zh{font-size:1.5rem;font-weight:600;color:#4a2a2a;margin-bottom:.3rem}
.book .en{font-size:1.05rem;color:#7a6a4a;font-style:italic;margin-bottom:1rem}
.book .desc{color:#555;font-size:.95rem;margin-bottom:1rem}
.book .stat{color:#9a8a6a;font-size:.85rem}
.chapters{list-style:none}
.chapters li{border-bottom:1px solid #eee5cc;padding:.7rem 0}
.chapters li a{display:flex;justify-content:space-between;align-items:baseline;gap:1rem}
.chapters .num{color:#9a8a6a;font-variant-numeric:tabular-nums;font-size:.85rem;min-width:3em}
.chapters .title{flex:1}
.chapters .stat{color:#9a8a6a;font-size:.8rem}
.parallel{display:grid;grid-template-columns:1fr 1fr;gap:2rem}
.col{background:#fff;border:1px solid #e0d6bc;border-radius:8px;padding:1.5rem 2rem}
.col h3{margin-top:0}
.lang-tag{display:inline-block;font-size:.7rem;padding:.1rem .5rem;background:#7a3030;color:#fff;border-radius:3px;margin-right:.5rem;vertical-align:middle}
.content p{margin-bottom:1rem}
.content em{color:#7a3030;font-style:italic}
.content hr{border:none;border-top:1px solid #d8cfb8;margin:1.5rem 0}
.nav{display:flex;justify-content:space-between;margin:2.5rem 0 1rem;font-size:.9rem}
.nav a{padding:.5rem 1rem;background:#fff;border:1px solid #d8cfb8;border-radius:4px}
.toggle{margin-bottom:1rem;font-size:.85rem;color:#7a6a4a}
.toggle a{margin-right:1rem}
.toggle a.active{color:#7a3030;font-weight:600}
@media(max-width:900px){.parallel{grid-template-columns:1fr}.col{padding:1rem 1.2rem}.books{grid-template-columns:1fr}}
footer{margin-top:3rem;padding-top:1.5rem;border-top:1px solid #d8cfb8;color:#9a8a6a;font-size:.85rem;text-align:center}