.navbar{display:flex;align-items:center;flex-wrap:wrap;padding:10px 20px;gap:12px;font-size:18px;background-color:#f9f9f9;border-bottom:1px solid #ddd}.navbar-right{margin-left:auto;display:flex;gap:12px}.logo{display:flex;align-items:center;font-size:22px;font-weight:700;margin-right:20px;gap:8px}.logo img{width:24px;height:24px}select{padding:6px 10px;font-size:18px;border-radius:6px;border:1px solid #ccc}select:hover{border-color:#4096ff}.year-options{display:flex;gap:10px;align-items:center}.year-options label{cursor:pointer;font-size:16px}.year-options input{margin-right:4px}.textbook-links-container{position:relative;display:flex;flex-wrap:wrap;align-items:center;font-size:.8em;gap:10px;margin-right:20px}.textbook-link{white-space:nowrap;text-decoration:none;color:#007bff;padding:5px 8px;transition:background-color .2s,color .2s}.textbook-link:hover{background-color:#007bff;color:#fff}.loading-textbooks,.error-textbooks,.no-textbooks{font-size:.8em;color:#666;margin-right:10px}.error-textbooks{color:#dc3545}.more-textbooks-dropdown{position:relative;display:inline-block}.dropdown-trigger{cursor:pointer;color:#007bff;padding:5px 8px;transition:background-color .2s,color .2s;white-space:nowrap}.dropdown-trigger:hover{background-color:#007bff;color:#fff}.dropdown-content{display:none;position:absolute;background-color:#f9f9f9;min-width:160px;box-shadow:0 8px 16px #0003;z-index:1;top:100%;left:0;border-radius:4px;overflow:hidden;padding:5px 0}.dropdown-content .textbook-link{display:block;color:#000;padding:8px 10px;text-decoration:none;border:none;border-radius:0;width:100%;box-sizing:border-box}.dropdown-content .textbook-link:hover{background-color:#007bff;color:#f9f9f9}.more-textbooks-dropdown:hover .dropdown-content{display:block}.paper-card{display:flex;flex-direction:column;border:1px solid #ddd;padding:12px;background-color:#fff;box-shadow:0 2px 6px #0000000d;transition:box-shadow .2s ease}.paper-card:hover{box-shadow:0 4px 12px #4096ff33}.paper-title{font-size:16px;font-weight:400}.paper-info{color:#848383;font-size:14px;margin-top:2px;margin-left:5px;margin-bottom:2px}.paper-footer{display:flex;justify-content:space-between;align-items:flex-end;padding:10px 0}.paper-meta{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.paper-year,.paper-district{display:flex;align-items:center;font-size:14px;color:#333}.icon{width:16px;height:16px;fill:#666;margin-right:4px;flex-shrink:0}.paper-actions{margin-left:auto}.btn{font-size:14px;border-radius:6px;transition:background-color .2s ease;text-align:center;display:inline-block;min-width:40px;color:#5e5e5e}.btn:hover{background-color:#aeaeae}.pdf-modal{position:fixed;top:0;left:0;width:100%;height:100%;z-index:9999}.pdf-overlay{position:absolute;width:100%;height:100%;background:#00000080}.pdf-container{position:absolute;top:50%;left:50%;width:90%;height:90%;transform:translate(-50%,-50%);background:#fff;box-shadow:0 0 20px #0000004d;border-radius:8px;overflow:hidden}.pdf-close{position:absolute;top:2px;right:2px;background:none;color:#fff;border:none;padding:5px 10px;border-radius:4px;cursor:pointer;z-index:10}.paper-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;padding:20px;margin:0 auto}