/* v45仅新增清华大学出版社系列；其他图书与首屏沿用原样。 */
#books-tsinghua{margin-top:76px;padding-top:34px;border-top:5px solid #27499d;scroll-margin-top:calc(var(--header) + 24px)}
#books-tsinghua .exam-series-heading{margin-bottom:30px}
#books-tsinghua .exam-series-heading>p{font-size:16px;line-height:1.8;color:#666;margin:0 0 12px}
#books-tsinghua .exam-series-heading h2{font-size:clamp(30px,2.8vw,44px);line-height:1.4;letter-spacing:-.8px;font-weight:600;margin:0;text-wrap:balance}
#books-tsinghua .exam-books{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:40px}
#books-tsinghua .exam-book{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:center;gap:24px;min-width:0;padding:18px 0 30px;border-bottom:1px solid #ddd}
#books-tsinghua .exam-book-cover{display:flex;align-items:center;justify-content:center;min-width:0;width:100%;height:clamp(240px,24vw,350px)}
#books-tsinghua .exam-book-cover img{display:block;object-fit:contain;width:100%;height:100%;max-width:350px}
#books-tsinghua .exam-book-copy{min-width:0}
#books-tsinghua .exam-book-copy h3{font-size:clamp(22px,2vw,30px);line-height:1.5;font-weight:600;letter-spacing:-.5px;margin:0 0 13px;overflow-wrap:anywhere}
#books-tsinghua .exam-book-copy p{font-size:16px;line-height:1.9;color:#666;margin:0;overflow-wrap:anywhere}
#books-tsinghua .exam-book-cover:focus-visible{outline:3px solid #252525;outline-offset:5px}
@media(max-width:1100px) and (min-width:761px){#books-tsinghua .exam-books{gap:28px}#books-tsinghua .exam-book{grid-template-columns:minmax(0,1fr);gap:15px;padding-bottom:26px}#books-tsinghua .exam-book-cover{height:290px}#books-tsinghua .exam-book-copy h3{font-size:25px}#books-tsinghua .exam-book-copy p{font-size:15px}}
@media(max-width:760px){
 #books-tsinghua{margin-top:42px;padding-top:24px;border-top-width:4px}
 #books-tsinghua .exam-series-heading{margin-bottom:17px}
 #books-tsinghua .exam-series-heading>p{font-size:13px;margin-bottom:10px}
 #books-tsinghua .exam-series-heading h2{font-size:28px;line-height:1.45;letter-spacing:-.6px}
 #books-tsinghua .exam-books{grid-template-columns:minmax(0,1fr);gap:12px}
 #books-tsinghua .exam-book{grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);gap:20px;padding:10px 0 22px}
 #books-tsinghua .exam-book-cover{height:clamp(180px,53vw,270px)}
 #books-tsinghua .exam-book-copy h3{font-size:22px;line-height:1.55;letter-spacing:-.5px;margin-bottom:10px}
 #books-tsinghua .exam-book-copy p{font-size:14px;line-height:1.85}
}
@media(max-width:359px){#books-tsinghua .exam-series-heading h2{font-size:25px}#books-tsinghua .exam-book{gap:14px}#books-tsinghua .exam-book-copy h3{font-size:20px}#books-tsinghua .exam-book-copy p{font-size:13px}}