*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;color:#333}.container{max-width:1200px;margin:0 auto;padding:20px}.header{text-align:center;padding:40px 0;color:#fff}.header h1{font-size:2.5rem;margin-bottom:10px;text-shadow:2px 2px 4px rgba(0,0,0,.2)}.header p{font-size:1.1rem;opacity:.9}.admin-link{position:fixed;top:20px;right:20px;background:hsla(0,0%,100%,.2);color:#fff;padding:10px 20px;border-radius:25px;text-decoration:none;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:all .3s;font-size:.9rem}.admin-link:hover{background:hsla(0,0%,100%,.3);transform:translateY(-2px)}.category-filter{display:flex;justify-content:center;gap:15px;margin-bottom:30px;flex-wrap:wrap}.category-btn{padding:12px 24px;border:none;border-radius:25px;cursor:pointer;font-size:1rem;transition:all .3s;background:#fff;color:#333;box-shadow:0 4px 6px rgba(0,0,0,.1)}.category-btn:hover{transform:translateY(-2px);box-shadow:0 6px 12px rgba(0,0,0,.15)}.category-btn.active{background:#333;color:#fff}.resources-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(350px,1fr));grid-gap:25px;gap:25px}.resource-card{background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 10px 30px rgba(0,0,0,.1);transition:all .3s}.resource-card:hover{transform:translateY(-5px);box-shadow:0 15px 40px rgba(0,0,0,.15)}.resource-image{object-fit:cover}.resource-image,.resource-image-placeholder{width:100%;height:200px;background:linear-gradient(45deg,#f0f0f0,#e0e0e0)}.resource-image-placeholder{display:flex;align-items:center;justify-content:center;font-size:4rem}.resource-content{padding:20px}.resource-category{display:inline-block;padding:5px 12px;border-radius:15px;font-size:.8rem;font-weight:600;margin-bottom:10px;color:#fff}.resource-title{font-size:1.3rem;margin-bottom:10px;color:#333}.resource-desc{color:#666;line-height:1.6;margin-bottom:15px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.download-btn{display:inline-block;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:12px 30px;border-radius:25px;text-decoration:none;font-weight:600;transition:all .3s;border:none;cursor:pointer;font-size:1rem}.download-btn:hover{transform:translateY(-2px);box-shadow:0 5px 15px rgba(102,126,234,.4)}.empty-state{text-align:center;padding:60px 20px;color:#fff}.empty-state h3{font-size:1.5rem;margin-bottom:10px}.admin-container{max-width:800px;margin:0 auto;padding:40px 20px}.admin-box{background:#fff;border-radius:16px;padding:40px;box-shadow:0 10px 30px rgba(0,0,0,.1)}.admin-title{text-align:center;margin-bottom:30px;color:#333}.form-group{margin-bottom:20px}.form-group label{display:block;margin-bottom:8px;font-weight:600;color:#333}.form-group input,.form-group select,.form-group textarea{width:100%;padding:12px;border:2px solid #e0e0e0;border-radius:8px;font-size:1rem;transition:border-color .3s;font-family:inherit}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:#667eea}.form-group textarea{resize:vertical;min-height:100px}.submit-btn{width:100%;padding:15px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:8px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .3s}.submit-btn:hover{transform:translateY(-2px);box-shadow:0 5px 15px rgba(102,126,234,.4)}.back-link{display:inline-block;margin-bottom:20px;color:#fff;text-decoration:none}.back-link:hover{text-decoration:underline}.resource-list{margin-top:40px}.resource-list h3{margin-bottom:20px;color:#333}.resource-item{display:flex;justify-content:space-between;align-items:center;padding:15px;background:#f8f9fa;border-radius:8px;margin-bottom:10px}.resource-item-info h4{margin-bottom:5px;color:#333}.resource-item-info span{font-size:.85rem;color:#666}.delete-btn{background:#ff6b6b;color:#fff;border:none;padding:8px 16px;border-radius:5px;cursor:pointer;transition:all .3s}.delete-btn:hover{background:#ff5252}.login-form{max-width:400px;margin:100px auto;background:#fff;padding:40px;border-radius:16px;box-shadow:0 10px 30px rgba(0,0,0,.1)}.login-form h2{text-align:center;margin-bottom:30px;color:#333}.error-msg{color:#ff6b6b;text-align:center;margin-bottom:15px}@media (max-width:768px){.header h1{font-size:1.8rem}.resources-grid{grid-template-columns:1fr}.category-filter{gap:10px}.category-btn{padding:10px 16px;font-size:.9rem}}