: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;--rgb-red:#e63946;--rgb-green:#2a9d8f;--rgb-blue:#4361ee;--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)}.converter-layout{display:grid;grid-template-columns:350px 1fr;gap:30px}.preview-section{display:flex;flex-direction:column;gap:20px}.color-box-large{height:280px;border-radius:var(--border-radius);box-shadow:inset 0 0 20px rgba(0,0,0,0.1),0 10px 20px rgba(0,0,0,0.1);position:relative;cursor:pointer;transition:var(--transition);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;overflow:hidden}.color-overlay{width:100%;height:100%;position:absolute;top:0;left:0}.controls-section{display:flex;flex-direction:column;gap:25px}.control-group{background:#f8f9fa;padding:20px;border-radius:12px;box-shadow:0 2px 8px rgba(0,0,0,0.03)}.group-title{font-size:1rem;font-weight:700;color:var(--secondary-color);margin-bottom:15px;display:flex;align-items:center;gap:8px}.slider-row{display:flex;align-items:center;gap:15px;margin-bottom:14px}.slider-label{width:28px;font-weight:700;font-size:1rem}.label-r{color:var(--rgb-red)}.label-g{color:var(--rgb-green)}.label-b{color:var(--rgb-blue)}.range-slider{flex:1;height:6px;border-radius:3px;cursor:pointer;-webkit-appearance:none;background:#ddd}.range-slider::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:white;border:2px solid #ccc;box-shadow:0 2px 4px rgba(0,0,0,0.2);cursor:pointer;transition:transform 0.1s}.range-slider:hover::-webkit-slider-thumb{transform:scale(1.1)}#range-r{background:linear-gradient(to right,#000,#f00)}#range-g{background:linear-gradient(to right,#000,#0f0)}#range-b{background:linear-gradient(to right,#000,#00f)}.slider-input{width:65px;padding:6px 8px;border:1px solid #ddd;border-radius:6px;text-align:center;font-family:'Consolas',monospace;font-size:0.9rem}.range-alpha{background:linear-gradient(to right,transparent,#000)}.picker-trigger{width:100%;padding:12px 16px;background:var(--primary-color);color:white;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:10px;transition:var(--transition);margin-top:8px}.picker-trigger:hover{background:var(--secondary-color);transform:translateY(-2px)}#native-picker{opacity:0;position:absolute;width:0;height:0;pointer-events:none}.result-row{display:flex;align-items:center;gap:10px;margin-bottom:12px}.result-label{width:60px;font-weight:600;font-size:0.9rem;color:var(--gray-color)}.result-input{flex:1;padding:10px 12px;border:1px solid #ddd;border-radius:8px;font-family:'Consolas',monospace;background:white;color:var(--dark-color);font-size:0.9rem}.copy-mini-btn{padding:8px 14px;background:white;border:1px solid #ddd;border-radius:8px;cursor:pointer;color:var(--gray-color);transition:var(--transition);font-size:0.9rem}.copy-mini-btn:hover{background:var(--primary-color);color:white;border-color:var(--primary-color)}@media (max-width:768px){.converter-layout{grid-template-columns:1fr}.color-box-large{height:220px}.slider-input{width:55px}}