.tool-header{text-align:center;margin-bottom:40px}.header-badge{display:flex;justify-content:center;gap:12px;margin-bottom:24px;flex-wrap:wrap}.badge{background:linear-gradient(135deg, #10b981, #059669);color:white;padding:6px 18px;border-radius:40px;font-size:0.75rem;font-weight:500;box-shadow:0 2px 8px rgba(0,0,0,0.1)}.tool-header h1{font-size:2.2rem;font-weight:800;background:linear-gradient(135deg, #1e293b, #10b981);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:12px}.tool-header p{color:var(--gray-500);font-size:1rem}.stats-cards{display:flex;justify-content:center;gap:24px;margin-bottom:32px;flex-wrap:wrap}.stat-card{background:white;border-radius:60px;padding:16px 28px;display:flex;align-items:center;gap:16px;box-shadow:0 4px 15px rgba(0,0,0,0.05);border:1px solid var(--gray-200)}.stat-icon{width:48px;height:48px;background:linear-gradient(135deg, #d1fae5, #ecfdf5);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#10b981;font-size:1.3rem}.stat-info{text-align:left}.stat-value{display:block;font-size:1.5rem;font-weight:700;color:var(--gray-800)}.stat-label{font-size:0.7rem;color:var(--gray-500)}.merge-tabs{display:flex;gap:16px;margin-bottom:24px;justify-content:center}.merge-tab{background:transparent;border:none;padding:12px 24px;cursor:pointer;transition:all 0.3s;border-radius:20px;text-align:center;min-width:140px}.merge-tab i{font-size:1.2rem;color:var(--gray-400);margin-bottom:8px;display:block}.merge-tab span{display:block;font-weight:600;color:var(--gray-600);margin-bottom:4px}.merge-tab small{font-size:0.65rem;color:var(--gray-400)}.merge-tab.active{background:linear-gradient(135deg, #10b981, #059669);box-shadow:0 8px 25px rgba(16,185,129,0.3)}.merge-tab.active i,.merge-tab.active span,.merge-tab.active small{color:white}.multi-editor{background:var(--gray-50);border-radius:24px;padding:20px;margin-bottom:24px}.source-list{max-height:300px;overflow-y:auto}.source-item{background:white;border-radius:16px;margin-bottom:12px;overflow:hidden;border:1px solid var(--gray-200)}.source-header{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;background:linear-gradient(135deg, #f8fafc, #fff);cursor:pointer}.source-title{font-weight:500;font-size:0.85rem}.source-actions{display:flex;gap:8px}.source-actions button{background:transparent;border:none;cursor:pointer;color:var(--gray-500);padding:4px}.source-actions button:hover{color:#ef4444}.source-content{padding:12px;border-top:1px solid var(--gray-200)}.source-textarea{width:100%;min-height:100px;padding:10px;font-family:monospace;font-size:0.8rem;border:1px solid var(--gray-200);border-radius:12px;resize:vertical}.line-editor{display:grid;grid-template-columns:1fr auto 1fr;gap:24px;margin-bottom:24px}.vs-icon{display:flex;align-items:center;justify-content:center;font-size:2rem;font-weight:700;color:#10b981}.merge-textarea{width:100%;min-height:250px;padding:16px;font-family:monospace;font-size:0.85rem;border:none;resize:vertical;background:#1a1a2e;color:#e0e0e0;border-radius:16px}.column-list{max-height:350px;overflow-y:auto}.column-item{background:white;border-radius:16px;margin-bottom:12px;padding:12px;border:1px solid var(--gray-200);display:flex;gap:12px;align-items:flex-start}.column-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.column-title{font-weight:500;font-size:0.8rem}.column-textarea{flex:1;min-height:80px;padding:10px;font-family:monospace;font-size:0.8rem;border:1px solid var(--gray-200);border-radius:12px;resize:vertical}.column-actions{display:flex;gap:8px}.merge-options{background:linear-gradient(135deg, #f8fafc, #fff);border-radius:24px;padding:20px;margin-bottom:24px;border:1px solid var(--gray-200)}.option-group{margin-bottom:20px}.option-group label{display:block;font-size:0.75rem;font-weight:600;color:var(--gray-500);margin-bottom:10px}.separator-input{display:flex;flex-wrap:wrap;align-items:center;gap:16px}.separator-field{width:120px;padding:8px 12px;border:1px solid var(--gray-200);border-radius:40px;font-family:monospace}.separator-presets{display:flex;gap:8px;flex-wrap:wrap}.sep-preset{background:var(--gray-100);border:1px solid var(--gray-200);padding:6px 16px;border-radius:30px;font-size:0.7rem;cursor:pointer;transition:all 0.2s}.sep-preset:hover{background:#10b981;color:white;border-color:#10b981}.checkbox-group{display:flex;flex-wrap:wrap;gap:20px}.checkbox-label{display:flex;align-items:center;gap:8px;cursor:pointer;font-size:0.8rem}.checkbox-label input{display:none}.checkmark{width:16px;height:16px;border:2px solid var(--gray-400);border-radius:4px;display:inline-block;position:relative}.checkbox-label input:checked+.checkmark{background:#10b981;border-color:#10b981}.checkbox-label input:checked+.checkmark::after{content:'\f00c';font-family:'Font Awesome 6 Free';font-weight:900;font-size:9px;color:white;position:absolute;top:50%;left:50%;transform:translate(-50%, -50%)}.prefix-suffix{display:flex;gap:20px}.prefix-input,.suffix-input{display:flex;align-items:center;gap:8px}.input-sm{padding:6px 12px;border:1px solid var(--gray-200);border-radius:30px;width:120px}.action-bar{display:flex;justify-content:center;gap:16px;margin-bottom:24px;flex-wrap:wrap}.merge-btn{background:linear-gradient(135deg, #10b981, #059669);padding:12px 32px;border-radius:50px}.btn-outline{background:transparent;border:1px solid var(--gray-300);padding:10px 24px;border-radius:50px;cursor:pointer}.btn-outline:hover{background:var(--gray-100)}.output-section{background:linear-gradient(135deg, #fff, #fafafc);border-radius:24px;overflow:hidden;border:1px solid var(--gray-200);margin-bottom:24px}.section-header{display:flex;justify-content:space-between;align-items:center;padding:14px 20px;background:linear-gradient(135deg, #f8fafc, #fff);border-bottom:1px solid var(--gray-200)}.header-title{display:flex;align-items:center;gap:12px;font-weight:600}.badge-count{background:#10b981;color:white;padding:2px 10px;border-radius:30px;font-size:0.7rem}.header-actions{display:flex;gap:8px}.icon-btn-sm{background:transparent;border:none;padding:6px 10px;border-radius:30px;cursor:pointer;color:var(--gray-500)}.icon-btn-sm:hover{background:var(--gray-100);color:#10b981}.output-textarea{width:100%;min-height:250px;padding:20px;font-family:monospace;font-size:0.85rem;line-height:1.6;border:none;resize:vertical;background:#1a1a2e;color:#e0e0e0}.info-section{margin-top:20px}.divider{display:flex;align-items:center;gap:12px;margin-bottom:16px}.divider span{font-size:0.85rem;font-weight:500;color:var(--gray-600)}.divider::after{content:'';flex:1;height:1px;background:var(--gray-200)}.info-grid{display:grid;grid-template-columns:repeat(4, 1fr);gap:16px;padding:16px;background:var(--gray-50);border-radius:20px}.info-item{display:flex;align-items:center;gap:8px;font-size:0.8rem;color:var(--gray-600)}.info-item i{color:#10b981}@media (max-width:900px){.line-editor{grid-template-columns:1fr}.vs-icon{display:none}.info-grid{grid-template-columns:repeat(2, 1fr)}.checkbox-group{flex-direction:column;gap:10px}.prefix-suffix{flex-direction:column}}@media (max-width:480px){.stats-cards{gap:12px}.stat-card{padding:12px 20px}.info-grid{grid-template-columns:1fr}.separator-input{flex-direction:column;align-items:flex-start}}