:root{--primary-color:#4361ee;--secondary-color:#3a0ca3;--accent-color:#7209b7;--light-color:#f8f9fa;--dark-color:#212529;--gray-color:#6c757d;--success-color:#4cc9f0;--warning-color:#f72585;--ref-primary:#475569;--ref-gradient:linear-gradient(135deg,#64748b 0%,#475569 100%);--border-radius:12px;--box-shadow:0 8px 24px rgba(0,0,0,0.1);--transition:all 0.3s ease}*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI','Microsoft YaHei',sans-serif}body{background-color:#f0f2f5;color:var(--dark-color);line-height:1.6}.container{width:100%;max-width:1000px;margin:0 auto;padding:0 20px}header{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:white;padding:20px 0;box-shadow:0 4px 12px rgba(0,0,0,0.1);position:sticky;top:0;z-index:100}.header-content{display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:15px}.logo i{font-size:2.5rem}.logo h1{font-size:1.8rem;font-weight:700}.logo span{color:var(--success-color)}nav ul{display:flex;list-style:none;gap:25px}nav a{color:white;text-decoration:none;font-weight:600;font-size:1.1rem;padding:8px 12px;border-radius:6px;transition:var(--transition)}nav a:hover,nav a.active{background-color:rgba(255,255,255,0.2)}main{padding:40px 0}.section-title{font-size:1.8rem;margin-bottom:25px;color:var(--secondary-color);display:flex;align-items:center;gap:10px}.section-title i{color:var(--accent-color)}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:25px;margin-bottom:40px}.tool-card{background:white;border-radius:var(--border-radius);padding:25px;box-shadow:var(--box-shadow);transition:var(--transition);cursor:pointer;border:2px solid transparent}.tool-card:hover{transform:translateY(-5px);border-color:var(--primary-color)}.tool-card i{font-size:2.5rem;color:var(--primary-color);margin-bottom:15px}.tool-card h3{font-size:1.4rem;margin-bottom:10px;color:var(--dark-color)}.tool-card p{color:var(--gray-color);margin-bottom:20px}.use-tool-btn{background-color:var(--primary-color);color:white;border:none;padding:10px 20px;border-radius:6px;font-weight:600;cursor:pointer;transition:var(--transition);width:100%}.use-tool-btn:hover{background-color:var(--secondary-color)}.tool-detail{background:white;border-radius:var(--border-radius);padding:30px;box-shadow:var(--box-shadow);margin-top:30px;display:none}.tool-detail.active{display:block}.tool-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px;padding-bottom:15px;border-bottom:2px solid #f0f2f5}.tool-header h2{font-size:1.6rem;color:var(--secondary-color)}.close-tool{background:none;border:none;font-size:1.5rem;color:var(--gray-color);cursor:pointer;transition:var(--transition)}.close-tool:hover{color:var(--warning-color)}.ct-wrapper{background:#f8fafc}.search-container{margin-bottom:25px}.search-input{width:100%;padding:12px 20px 12px 45px;border:2px solid #e2e8f0;border-radius:10px;font-size:1rem;outline:none;transition:var(--transition);background:white}.search-input:focus{border-color:var(--ref-primary);box-shadow:0 0 0 3px rgba(71,85,105,0.1)}.search-icon-wrapper{position:absolute;margin-left:15px;margin-top:-32px;color:var(--gray-color)}.cat-header{font-size:1.1rem;font-weight:700;color:var(--secondary-color);margin:25px 0 15px 0;padding-bottom:8px;border-bottom:2px solid #e2e8f0}.cat-header:first-child{margin-top:0}.ct-list{background:white;border-radius:8px;border:1px solid #e2e8f0;overflow:hidden}.ct-item{display:flex;align-items:center;justify-content:space-between;padding:15px 20px;border-bottom:1px solid #f1f5f9;transition:var(--transition)}.ct-item:last-child{border-bottom:none}.ct-item:hover{background:#f8fafc}.ct-info{display:flex;align-items:center;gap:20px;flex:1;overflow:hidden}.ct-ext{background:#e2e8f0;color:var(--secondary-color);font-family:'Consolas',monospace;font-weight:700;padding:4px 8px;border-radius:4px;font-size:0.9rem;min-width:60px;text-align:center;flex-shrink:0}.ct-desc{color:var(--gray-color);font-size:0.9rem;margin-right:15px;display:none}@media(min-width:768px){.ct-desc{display:block}}.ct-mime{font-family:'Consolas',monospace;color:var(--dark-color);font-size:0.95rem;word-break:break-all}.copy-btn-sm{background:white;border:1px solid #cbd5e1;color:var(--gray-color);width:36px;height:36px;border-radius:6px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition);flex-shrink:0;margin-left:15px}.copy-btn-sm:hover{background:var(--ref-primary);color:white;border-color:var(--ref-primary)}.empty-msg{text-align:center;padding:40px;color:var(--gray-color);font-size:1.1rem}