* { box-sizing: border-box; margin: 0; padding: 0; }
body { background-color: #f6f9fc; font-family: "PingFang SC", "Lantinghei SC", "Microsoft YaHei", sans-serif; color: #2c3e50; overflow-x: hidden; }
a { text-decoration: none; color: inherit; }
.studywrap { max-width: 1200px; margin: 0 auto; padding: 0 15px; }
.studytopbar { background: #f8fafd; border-bottom: 1px solid #e1e8ed; font-size: 13px; line-height: 32px; height: 32px; color: #7f8c8d; }
.studytopbar .studywrap { display: flex; justify-content: space-between; }
.studysep { margin: 0 6px; color: #d1d8e0; }
.studyheader { background: #0088cc; padding: 22px 0; }
.studyheadflex { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.studylogo img { height: 42px; max-width: 200px; object-fit: contain; display: block; filter: brightness(0) invert(1); }
.studysearchform { display: flex; flex: 1; max-width: 450px; border-radius: 20px; overflow: hidden; background: #ffffff; padding: 2px; }
.studysearchinput { flex: 1; border: none; padding: 0 14px; height: 34px; outline: none; font-size: 13px; color: #333; }
.studysearchbtn { background: #0088cc; color: #ffffff; border: none; padding: 0 18px; height: 34px; cursor: pointer; font-size: 13px; font-weight: bold; border-radius: 17px; }
.studynavbar { background: #ffffff; height: 44px; border-bottom: 1px solid #e1e8ed; }
.studynavflex { display: flex; align-items: center; gap: 2px; overflow-x: auto; white-space: nowrap; }
.studynavitem { color: #333; padding: 0 16px; line-height: 44px; height: 44px; font-size: 14px; font-weight: bold; display: inline-block; transition: background 0.2s, color 0.2s; }
.studynavitem:hover, .studynavitem.active { background: #ebf5ff; color: #0088cc; }
.studymain { margin: 25px auto; }
.studyherocards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 15px; margin-bottom: 25px; }
@media (max-width: 768px) { .studyherocards { grid-template-columns: repeat(2, 1fr); } }
.studyherocard { padding: 15px; border-radius: 8px; color: #ffffff; text-align: center; display: flex; flex-direction: column; justify-content: center; height: 75px; box-shadow: 0 4px 10px rgba(0,0,0,0.05); transition: transform 0.2s; }
.studyherocard:hover { transform: translateY(-3px); }
.studyherocard h3 { font-size: 14px; font-weight: bold; }
.studyherocard p { font-size: 11px; opacity: 0.85; margin-top: 2px; }
.studysec { display: grid; grid-template-columns: 1fr 300px; gap: 20px; margin-bottom: 25px; }
@media (max-width: 992px) { .studysec { grid-template-columns: 1fr; } }
.studyleftbox { background: #ffffff; border-radius: 8px; border: 1px solid #e1e8ed; padding: 18px; }
.studysectitle { display: flex; justify-content: space-between; align-items: center; border-bottom: 2px solid #0088cc; padding-bottom: 8px; margin-bottom: 15px; }
.studysectitle span { font-size: 15px; font-weight: bold; color: #0088cc; }
.studymore { font-size: 12px; color: #7f8c8d; }
.studymore:hover { color: #0088cc; }
.studygrid2x2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-bottom: 15px; border-bottom: 1px dashed #e1e8ed; padding-bottom: 15px; }
@media (max-width: 640px) { .studygrid2x2 { grid-template-columns: 1fr; } }
.studygriditem { display: flex; gap: 10px; align-items: center; background: #fafbfc; border-radius: 6px; padding: 10px; border: 1px solid #eef2f5; }
.studygridimg { width: 52px; height: 52px; object-fit: cover; border-radius: 4px; flex-shrink: 0; }
.studygridinfo { flex: 1; overflow: hidden; }
.studygridtitle { font-size: 13px; font-weight: bold; color: #2c3e50; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin-bottom: 4px; }
.studygridtitle a:hover { color: #0088cc; }
.studygridprice { color: #e53e3e; font-size: 14px; font-weight: bold; }
.studytextgrid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.studytxtitem { font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: #4a5568; }
.studytxtitem a:hover { color: #0088cc; text-decoration: underline; }
.studyrightbox { background: #ffffff; border-radius: 8px; border: 1px solid #e1e8ed; padding: 15px; height: fit-content; }
.studyrighthead { font-size: 14px; font-weight: bold; color: #0088cc; border-bottom: 2px solid #0088cc; padding-bottom: 8px; margin-bottom: 12px; }
.studyrightfeatured { border-bottom: 1px dashed #e1e8ed; padding-bottom: 10px; margin-bottom: 10px; text-align: center; }
.studyrightfeatured img { width: 100%; height: 95px; object-fit: cover; border-radius: 4px; margin-bottom: 6px; }
.studyrightfeaturedtitle { font-size: 12px; font-weight: bold; color: #333; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.studyrightfeaturedtitle a:hover { color: #0088cc; }
.studyranklist { list-style: none; }
.studyrankitem { display: flex; align-items: center; justify-content: space-between; padding: 6px 0; border-bottom: 1px dashed #fafbfc; font-size: 12px; }
.studyranknum { width: 18px; height: 18px; background: #ccd6dd; color: #fff; text-align: center; line-height: 18px; border-radius: 3px; font-size: 10px; font-weight: bold; margin-right: 8px; flex-shrink: 0; }
.studyrankitem:nth-child(-n+3) .studyranknum { background: #0088cc; }
.studyrankname { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: #4a5568; }
.studycardbox { background: #ffffff; border-radius: 8px; border: 1px solid #e1e8ed; padding: 30px; max-width: 650px; margin: 0 auto; }
.studyfooter { background: #2c3e50; color: #a0aec0; padding: 25px 0; text-align: center; font-size: 13px; margin-top: 40px; border-top: 2px solid #1a202c; }
.studyfooter a { color: #edf2f7; margin-bottom: 6px; display: inline-block; }
.studyfooter p { color: #718096; font-size: 12px; margin-top: 4px; }