: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;--code-color:#e95420;--preview-color:#10b981;--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)}.tool-detail{background:white;border-radius:var(--border-radius);padding:30px;box-shadow:var(--box-shadow);animation:fadeIn 0.5s ease}.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)}.editor-container{display:flex;flex-direction:column;gap:20px}.editor-row{display:flex;flex-wrap:wrap;gap:20px}.editor-col{flex:1;min-width:300px;display:flex;flex-direction:column}.panel-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.panel-title{font-size:1.2rem;color:var(--dark-color);display:flex;align-items:center;gap:8px}.code-label{color:var(--code-color)}.preview-label{color:var(--preview-color)}textarea{width:100%;height:400px;padding:15px;border:2px solid #e0e0e0;border-radius:var(--border-radius);font-family:'Consolas','Monaco','Courier New',monospace;font-size:0.95rem;line-height:1.5;resize:vertical;transition:var(--transition)}textarea:focus{outline:none;border-color:var(--primary-color)}#html-input{background-color:#f8f9fa;border-left:4px solid var(--code-color)}.preview-wrapper{width:100%;height:400px;border:2px solid #e0e0e0;border-radius:var(--border-radius);overflow:hidden;background:white;position:relative;border-left:4px solid var(--preview-color)}iframe{width:100%;height:100%;border:none;display:block}.toolbar{display:flex;justify-content:space-between;align-items:center;background:#f8f9fa;padding:10px 15px;border-radius:8px;margin-bottom:10px;border:1px solid #e0e0e0}.toolbar-group{display:flex;gap:10px;align-items:center}.action-btn{padding:8px 16px;border-radius:6px;border:none;font-weight:600;cursor:pointer;transition:var(--transition);display:flex;align-items:center;gap:6px;font-size:0.9rem}.btn-primary{background-color:var(--primary-color);color:white}.btn-primary:hover{background-color:var(--secondary-color)}.btn-secondary{background-color:white;border:1px solid #ccc;color:var(--dark-color)}.btn-secondary:hover{background-color:#e9ecef}.btn-warning{background-color:var(--warning-color);color:white}.btn-warning:hover{background-color:#d1146a}.checkbox-label{display:flex;align-items:center;gap:6px;font-size:0.9rem;cursor:pointer}.stats-bar{display:flex;gap:20px;padding:10px 0;color:var(--gray-color);font-size:0.85rem;border-top:1px solid #eee;margin-top:10px}@media (max-width:768px){.editor-row{flex-direction:column}.toolbar{flex-direction:column;gap:10px}.toolbar-group{flex-wrap:wrap;justify-content:center}}@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}