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img{width:100%;height:100%;object-fit:cover}.user-dropdown{position:absolute;top:60px;right:20px;background:#fff;border-radius:8px;box-shadow:var(--shadow);padding:8px 0;min-width:160px;z-index:100}.user-dropdown .dropdown-item{display:flex;align-items:center;padding:12px 20px;cursor:pointer;font-size:14px;color:var(--text-color)}.user-dropdown .dropdown-item:hover{background:var(--bg-color)}.user-dropdown .dropdown-item span{margin-left:8px}.category-nav{background:#fff;padding:20px 0;border-radius:8px;box-shadow:var(--shadow)}.category-nav .nav-container{display:flex;justify-content:center;gap:40px;overflow-x:auto;scrollbar-width:none;padding:20px}.category-nav .nav-container::-webkit-scrollbar{display:none}.category-nav .nav-item{display:flex;flex-direction:column;align-items:center;cursor:pointer;min-width:80px}.category-nav .nav-item.active .icon-wrapper{background:linear-gradient(135deg,#1e88e5,#1976d2);box-shadow:0 4px 12px #1e88e566}.category-nav .nav-item.active 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.section-content{display:grid;grid-template-columns:repeat(5,1fr);gap:20px;padding:20px 0}.resource-card{background:#fff;border-radius:8px;overflow:hidden;cursor:pointer;border:1px solid var(--border-color)}.resource-card .card-thumbnail{position:relative;width:100%;padding-top:56.25%;background:#f0f0f0;overflow:hidden}.resource-card .card-thumbnail .thumbnail-img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover}.resource-card .card-thumbnail .duration-badge{position:absolute;bottom:8px;right:8px;background:#000000b3;color:#fff;padding:2px 6px;border-radius:4px;font-size:12px}.resource-card .card-thumbnail .lock-icon{position:absolute;top:8px;right:8px;background:#00000080;color:#fff;padding:4px 8px;border-radius:4px;font-size:12px}.resource-card .card-info{padding:12px}.resource-card .card-info .card-title{display:flex;align-items:center;gap:4px;font-size:14px;font-weight:700;color:var(--text-color);margin-bottom:8px}.resource-card .card-info 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.form-group{margin-bottom:20px}.login-modal .modal-content .form-group label{display:block;font-size:14px;color:var(--text-color);margin-bottom:8px}.login-modal .modal-content .form-group input{width:100%;padding:12px;border:1px solid var(--border-color);border-radius:4px;font-size:14px;box-sizing:border-box}.login-modal .modal-content .form-group input:focus{outline:none;border-color:var(--primary-color)}.login-modal .modal-content .submit-btn{width:100%;padding:12px;background:var(--primary-color);color:#fff;border:none;border-radius:4px;font-size:16px;cursor:pointer;transition:background .3s}.login-modal .modal-content .submit-btn:hover{background:#1976d2}.login-modal .modal-content .submit-btn.register{background:var(--success-color);margin-top:10px}.login-modal .modal-content .submit-btn.register:hover{background:#388e3c}.login-modal .modal-content .switch-mode{text-align:center;margin-top:16px;font-size:14px;color:var(--text-secondary)}.login-modal .modal-content .switch-mode span{color:var(--primary-color);cursor:pointer}.login-modal .modal-content .switch-mode span:hover{text-decoration:underline}.el-button.active{background:var(--primary-color)!important;color:#fff!important;border-color:var(--primary-color)!important}.el-loading-mask{background:#ffffffe6}@media(max-width:1200px){.resource-section .section-content,.resource-center .resource-grid{grid-template-columns:repeat(4,1fr)}}@media(max-width:900px){.resource-section .section-content,.resource-center .resource-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:600px){.resource-section .section-content,.resource-center .resource-grid{grid-template-columns:repeat(2,1fr)}.category-nav .nav-container{justify-content:flex-start;gap:20px;padding:0 10px}.nav-item{min-width:60px}.nav-item .icon-wrapper{width:50px;height:50px;font-size:24px}.nav-item .category-name{font-size:11px}}