: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;--color-tool-primary:#8b5cf6;--color-tool-gradient:linear-gradient(135deg,#a78bfa 0%,#7c3aed 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:1200px;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)}.color-converter-wrapper{display:flex;flex-wrap:wrap;gap:30px}.converter-controls{flex:1;min-width:300px;display:flex;flex-direction:column;gap:20px}.preview-box{height:180px;border-radius:var(--border-radius);box-shadow:inset 0 2px 4px rgba(0,0,0,0.05);border:1px solid #e2e8f0;display:flex;flex-direction:column;align-items:center;justify-content:center;transition:var(--transition);position:relative;overflow:hidden}.preview-box::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;z-index:-1;background-image:linear-gradient(45deg,#ccc 25%,transparent 25%),linear-gradient(-45deg,#ccc 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#ccc 75%),linear-gradient(-45deg,transparent 75%,#ccc 75%);background-size:20px 20px;background-position:0 0,0 10px,10px -10px,-10px 0px}.color-hex-large{font-size:2rem;font-weight:800;text-transform:uppercase;font-family:'Consolas',monospace;letter-spacing:1px}.color-native-picker-wrapper{margin-top:10px;position:relative;display:inline-block}input[type="color"]{-webkit-appearance:none;border:none;width:40px;height:40px;border-radius:50%;cursor:pointer;overflow:hidden;background:none;padding:0;box-shadow:0 2px 5px rgba(0,0,0,0.2)}input[type="color"]::-webkit-color-swatch-wrapper{padding:0}input[type="color"]::-webkit-color-swatch{border:none;border-radius:50%}.slider-group{background:#f8fafc;padding:15px;border-radius:10px;border:1px solid #e2e8f0}.slider-row{display:flex;align-items:center;gap:15px;margin-bottom:12px}.slider-row:last-child{margin-bottom:0}.label-r{color:#ef4444;font-weight:bold;width:20px}.label-g{color:#22c55e;font-weight:bold;width:20px}.label-b{color:#3b82f6;font-weight:bold;width:20px}.range-slider{flex:1;-webkit-appearance:none;height:6px;border-radius:5px;background:#e2e8f0;outline:none}.slider-red::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:#ef4444;cursor:pointer;border:2px solid white;box-shadow:0 2px 4px rgba(0,0,0,0.2)}.slider-green::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:#22c55e;cursor:pointer;border:2px solid white;box-shadow:0 2px 4px rgba(0,0,0,0.2)}.slider-blue::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:#3b82f6;cursor:pointer;border:2px solid white;box-shadow:0 2px 4px rgba(0,0,0,0.2)}.slider-val{width:40px;text-align:right;font-family:'Consolas',monospace;font-weight:600;color:var(--gray-color)}.hex-input-wrapper{display:flex;align-items:center;background:white;border:2px solid #e2e8f0;border-radius:8px;padding:5px 10px;transition:var(--transition)}.hex-input-wrapper:focus-within{border-color:var(--color-tool-primary)}.hex-prefix{color:var(--gray-color);font-weight:700;margin-right:5px}.hex-input{border:none;outline:none;font-family:'Consolas',monospace;font-size:1.2rem;width:100%;text-transform:uppercase;color:var(--dark-color)}.converter-results{flex:1;min-width:300px;display:grid;grid-template-columns:1fr;gap:15px;align-content:start}.result-item{background:#f5f3ff;border:1px solid #ddd6fe;border-radius:8px;padding:15px;display:flex;justify-content:space-between;align-items:center;transition:var(--transition)}.result-item:hover{border-color:var(--color-tool-primary);background:white;box-shadow:0 4px 10px rgba(0,0,0,0.05)}.result-label{font-size:0.9rem;color:var(--secondary-color);font-weight:600}.result-value-box{display:flex;align-items:center;gap:10px}.result-text{font-family:'Consolas',monospace;font-size:1.1rem;color:var(--dark-color);font-weight:700}.copy-btn-sm{background:white;border:1px solid #e2e8f0;color:var(--gray-color);width:32px;height:32px;border-radius:6px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition)}.copy-btn-sm:hover{background:var(--color-tool-primary);color:white;border-color:var(--color-tool-primary)}@media (max-width:768px){.color-converter-wrapper{flex-direction:column}}