:root{--bg-body:#f0f4f8;--bg-card:#fff;--bg-card-hover:#fafbfc;--bg-header:linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);--bg-upload-zone:#f8fbff;--bg-upload-zone-hover:#ebf5ff;--bg-upload-zone-border:#bfd7ed;--text-primary:#1e293b;--text-secondary:#64748b;--text-tertiary:#94a3b8;--text-white:#fff;--text-link:#2563eb;--accent-blue:#2563eb;--accent-blue-light:#dbeafe;--accent-blue-dark:#1d4ed8;--accent-green:#10b981;--accent-green-light:#d1fae5;--accent-green-dark:#059669;--accent-teal:#14b8a6;--accent-teal-light:#ccfbf1;--accent-orange:#f59e0b;--accent-orange-light:#fef3c7;--accent-red:#ef4444;--accent-red-light:#fee2e2;--border-light:#e2e8f0;--border-medium:#cbd5e1;--border-focus:#2563eb;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 6px -1px #00000012, 0 2px 4px -1px #0000000a;--shadow-lg:0 10px 25px -3px #00000014, 0 4px 6px -2px #00000008;--shadow-xl:0 20px 40px -5px #0000001a;--font-sans:"Inter", "Noto Sans Thai", system-ui, -apple-system, sans-serif;--font-mono:"SF Mono", 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70%);border-radius:50%;width:300px;height:300px;position:absolute;top:-50%;right:-10%}.header-left{align-items:center;gap:16px;display:flex}.logo-badge{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-radius:var(--radius-md);width:44px;height:44px;transition:transform var(--transition-normal);background:#ffffff26;border:1px solid #fff3;justify-content:center;align-items:center;display:flex}.logo-badge:hover{transform:scale(1.08)}.logo-badge svg{color:#fff;width:26px;height:26px}.header-titles{flex-direction:column;gap:2px;display:flex}.header-title{color:var(--text-white);letter-spacing:-.3px;font-size:18px;font-weight:700;line-height:1.3}.header-subtitle{color:#fff9;font-size:12px;font-weight:400}.header-right,.status-guide{align-items:center;gap:16px;display:flex}.guide-item{color:#fffc;align-items:center;gap:6px;font-size:12px;display:flex}.guide-dot{border-radius:50%;flex-shrink:0;width:8px;height:8px}.guide-dot.green{background:var(--accent-green);box-shadow:0 0 6px #10b98180}.guide-dot.blue{background:#60a5fa;box-shadow:0 0 6px #60a5fa80}.btn-clear-data{font-size:12px;font-weight:500;font-family:var(--font-sans);color:#fee2e2;border-radius:var(--radius-full);cursor:pointer;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);transition:all var(--transition-fast);background:#ef444433;border:1px solid #ef444466;align-items:center;gap:6px;margin-left:8px;padding:6px 14px;display:inline-flex}.btn-clear-data:hover{color:#fff;background:#ef444459;border-color:#ef444499;transform:translateY(-1px)}.btn-clear-data:active{transform:translateY(0)}.btn-clear-data svg{width:14px;height:14px}.header-user{border-left:1px solid #fff3;align-items:center;gap:10px;padding-left:16px;display:flex}.header-username{color:var(--text-white);font-size:13px;font-weight:600}.btn-logout{font-size:12px;font-weight:500;font-family:var(--font-sans);color:var(--text-white);border-radius:var(--radius-full);cursor:pointer;transition:all var(--transition-fast);background:#ffffff1f;border:1px solid #ffffff4d;align-items:center;gap:6px;padding:6px 14px;display:inline-flex}.btn-logout:hover{background:#ffffff38}.btn-logout svg{width:14px;height:14px}@media (width<=768px){.header{border-radius:0;flex-direction:column;gap:12px;padding:14px 16px}.header-right{flex-wrap:wrap;justify-content:center;width:100%}.header-user{border-left:none;padding-left:0}.status-guide{gap:12px}}.upload-section{grid-template-columns:1fr 1fr;gap:24px;padding:24px 32px;animation:.5s ease-out .1s both fadeInUp;display:grid}.upload-zone{background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--border-light);transition:box-shadow var(--transition-normal);overflow:hidden}.upload-zone:hover{box-shadow:var(--shadow-md)}.upload-zone-header{border-bottom:1px solid var(--border-light);justify-content:space-between;align-items:center;padding:16px 20px;display:flex}.upload-zone-title{color:var(--text-primary);font-size:14px;font-weight:600}.upload-zone-counter{color:var(--accent-blue);background:var(--accent-blue-light);border-radius:var(--radius-full);padding:3px 10px;font-size:12px;font-weight:600}.drop-area{border:2px dashed var(--bg-upload-zone-border);border-radius:var(--radius-md);background:var(--bg-upload-zone);cursor:pointer;transition:all var(--transition-normal);flex-direction:column;align-items:center;gap:10px;margin:16px 20px;padding:32px 24px;display:flex;position:relative}.drop-area:hover,.drop-area.drag-over{background:var(--bg-upload-zone-hover);border-color:var(--accent-blue);transform:translateY(-1px)}.drop-area.drag-over{border-color:var(--accent-green);background:var(--accent-green-light)}.drop-area-icon{width:40px;height:40px;color:var(--accent-blue);opacity:.6;transition:all var(--transition-normal)}.drop-area:hover .drop-area-icon{opacity:1;transform:translateY(-3px)}.drop-area-text{color:var(--text-secondary);text-align:center;font-size:13px;line-height:1.5}.drop-area-text strong{color:var(--accent-blue);cursor:pointer}.drop-area-hint{color:var(--text-tertiary);font-size:11px}.drop-area input[type=file]{opacity:0;cursor:pointer;position:absolute;inset:0}.file-list{flex-direction:column;gap:8px;padding:0 20px 16px;display:flex}.file-list-empty{text-align:center;color:var(--text-tertiary);padding:20px;font-size:13px}@media (width<=768px){.upload-section{grid-template-columns:1fr;gap:16px;padding:16px}}.file-row{background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-md);transition:all var(--transition-normal);align-items:center;gap:12px;padding:10px 14px;animation:.3s ease-out forwards slideInRight;display:flex}.file-row:hover{border-color:var(--accent-blue);box-shadow:var(--shadow-sm);background:#fafbff}.file-icon{background:var(--accent-green-light);border-radius:var(--radius-sm);flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;display:flex}.file-icon svg{width:18px;height:18px;color:var(--accent-green)}.file-info{flex:1;min-width:0}.file-name{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:500;overflow:hidden}.file-size{color:var(--text-tertiary);margin-top:1px;font-size:11px}.file-badge{border-radius:var(--radius-full);white-space:nowrap;flex-shrink:0;padding:3px 10px;font-size:11px;font-weight:500}.file-badge.ready{background:var(--accent-green-light);color:var(--accent-green-dark)}.file-badge.processing{background:var(--accent-blue-light);color:var(--accent-blue)}.file-badge.error{background:var(--accent-red-light);color:var(--accent-red)}.file-delete{border-radius:var(--radius-sm);cursor:pointer;width:28px;height:28px;color:var(--text-tertiary);transition:all var(--transition-fast);opacity:0;background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;display:flex}.file-row:hover .file-delete{opacity:1}.file-delete:hover{background:var(--accent-red-light);color:var(--accent-red)}.merge-section{padding:0 32px 24px;animation:.5s ease-out .2s both fadeInUp}.merge-container{grid-template-columns:1fr 1fr;align-items:start;gap:24px;display:grid}.merge-left{background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--border-light);overflow:hidden}.merge-panel-header{border-bottom:1px solid var(--border-light);justify-content:space-between;align-items:center;padding:14px 20px;display:flex}.merge-panel-title{color:var(--text-primary);font-size:14px;font-weight:600}.merge-panel-subtitle{color:var(--text-tertiary);margin-top:2px;font-size:11px}.merge-panel-count{color:var(--text-secondary);font-size:12px;font-weight:500}.merge-info-bar{background:var(--accent-blue-light);color:var(--accent-blue);align-items:center;gap:8px;padding:10px 20px;font-size:12px;display:flex}.merge-info-bar svg{flex-shrink:0;width:14px;height:14px}.merge-file-list{padding:8px 12px}.merge-file-item{border-bottom:1px solid var(--border-light);transition:background var(--transition-fast);justify-content:space-between;align-items:center;padding:10px 12px;display:flex}.merge-file-item:last-child{border-bottom:none}.merge-file-item:hover{background:#fafbff}.merge-file-name{color:var(--text-primary);font-size:13px;font-weight:500}.merge-pair-badge{border-radius:var(--radius-full);background:var(--accent-teal-light);color:var(--accent-teal);cursor:default;align-items:center;gap:4px;max-width:200px;padding:4px 10px;font-size:11px;font-weight:500;display:flex}.merge-pair-badge svg{flex-shrink:0;width:12px;height:12px}.merge-pair-badge span{white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.merge-pair-select{color:var(--text-tertiary);align-items:center;gap:4px;font-size:12px;display:flex}.merge-pair-select svg{width:14px;height:14px}.merge-select-dropdown{font-family:var(--font-sans);color:#2563eb;border-radius:var(--radius-full);cursor:pointer;text-overflow:ellipsis;white-space:nowrap;appearance:none;max-width:240px;transition:all var(--transition-fast);background-color:#eff6ff;background-image:url("data:image/svg+xml,%3Csvg 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20px;display:flex}.merge-arrow-label{color:var(--accent-blue);background:var(--accent-blue-light);border-radius:var(--radius-full);white-space:nowrap;padding:4px 12px;font-size:11px;font-weight:600}.merge-arrow-btn{background:var(--accent-green);color:#fff;cursor:pointer;width:44px;height:44px;transition:all var(--transition-normal);border:none;border-radius:50%;justify-content:center;align-items:center;display:flex;box-shadow:0 4px 12px #10b9814d}.merge-arrow-btn:hover{transform:scale(1.1);box-shadow:0 6px 20px #10b98166}.merge-arrow-btn:active{transform:scale(.95)}.merge-arrow-btn svg{width:22px;height:22px}.merge-arrow-hint{color:var(--text-tertiary);text-align:center;max-width:100px;font-size:10px;line-height:1.4}.merge-right{background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--border-light);overflow:hidden}.merge-right-header{border-bottom:1px solid var(--border-light);justify-content:space-between;align-items:center;padding:14px 20px;display:flex}.merge-right-count{color:var(--accent-blue);font-size:12px;font-weight:500}.merge-group2-item{border-bottom:1px solid var(--border-light);padding:10px 20px}.merge-group2-item:last-child{border-bottom:none}.merge-group2-name{color:var(--accent-blue);background:var(--accent-blue-light);border-radius:var(--radius-sm);width:100%;transition:all var(--transition-normal);justify-content:space-between;align-items:center;padding:6px 14px;font-size:13px;font-weight:600;display:inline-flex}.merge-group2-name.unselected{color:var(--text-secondary);background:var(--bg-card-hover);font-weight:500}.merge-group2-count{color:var(--accent-blue);font-size:11px;font-weight:500}.merge-group2-sub{color:var(--text-secondary);padding:4px 14px;font-size:12px}.merge-group2-sub-list{flex-direction:column;gap:4px;padding:6px 14px 8px 16px;display:flex}.merge-group2-sub-item{background:var(--bg-body);border-radius:var(--radius-sm);color:var(--text-primary);border:1px dashed var(--border-light);justify-content:space-between;align-items:center;padding:4px 10px;font-size:12px;display:flex}.remove-pair-btn{color:var(--text-tertiary);cursor:pointer;transition:all var(--transition-fast);background:0 0;border:none;border-radius:4px;padding:2px 6px;font-size:11px}.remove-pair-btn:hover{background:var(--accent-red-light);color:var(--accent-red)}.right-add-select{font-family:var(--font-sans);color:#2563eb;border-radius:var(--radius-full);cursor:pointer;appearance:none;max-width:190px;transition:all var(--transition-fast);background-color:#eff6ff;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%232563EB' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 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var(--transition-normal);border:none;align-items:center;gap:10px;padding:14px 32px;display:inline-flex;position:relative;overflow:hidden}.download-btn.btn-excel{background:linear-gradient(135deg,#10b981 0%,#059669 100%);box-shadow:0 4px 16px #10b98159}.download-btn.btn-excel:hover{transform:translateY(-2px);box-shadow:0 8px 24px #10b98173}.download-btn.btn-pdf{background:linear-gradient(135deg,#2563eb 0%,#1d4ed8 100%);box-shadow:0 4px 16px #2563eb59}.download-btn.btn-pdf:hover{transform:translateY(-2px);box-shadow:0 8px 24px #2563eb73}.download-btn:before{content:"";background:linear-gradient(90deg,#0000,#fff3,#0000);width:100%;height:100%;transition:left .5s;position:absolute;top:0;left:-100%}.download-btn:hover:before{left:100%}.download-btn:active{transform:translateY(0);box-shadow:0 2px 8px #0003}.download-btn:disabled{opacity:.45;cursor:not-allowed;box-shadow:none;transform:none}.download-btn:disabled:hover:before{left:-100%}.download-btn svg{width:20px;height:20px}.spin-icon{animation:1s linear infinite spin}.download-hint{color:var(--text-tertiary);text-align:center;max-width:540px;font-size:12px;line-height:1.5}.download-hint svg{vertical-align:-2px;width:13px;height:13px;color:var(--text-tertiary);margin-right:4px}@media (width<=768px){.download-section{padding:8px 16px 32px}.download-buttons-group{flex-direction:column;width:100%}.download-btn{justify-content:center;width:100%;padding:14px 24px}}.auth-screen{justify-content:center;align-items:center;min-height:100vh;padding:24px 16px;display:flex}.auth-status{color:var(--text-secondary);font-size:15px;animation:.3s ease-out fadeIn}.auth-card{background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-xl);width:100%;max-width:400px;box-shadow:var(--shadow-xl);flex-direction:column;padding:32px 28px;animation:.4s ease-out fadeInUp;display:flex}.auth-brand{text-align:center;flex-direction:column;align-items:center;margin-bottom:24px;display:flex}.auth-logo{border-radius:var(--radius-lg);background:var(--bg-header);width:56px;height:56px;color:var(--text-white);box-shadow:var(--shadow-md);justify-content:center;align-items:center;margin-bottom:14px;display:flex}.auth-logo svg{width:30px;height:30px}.auth-title{color:var(--text-primary);font-size:20px;font-weight:700;line-height:1.3}.auth-subtitle{color:var(--text-secondary);margin-top:4px;font-size:14px}.auth-label{color:var(--text-primary);margin-bottom:6px;font-size:14px;font-weight:600}.auth-input{width:100%;height:48px;font-size:16px;font-family:var(--font-sans);color:var(--text-primary);background:var(--bg-card);border:1px solid var(--border-medium);border-radius:var(--radius-md);transition:border-color var(--transition-fast), box-shadow var(--transition-fast);margin-bottom:16px;padding:0 14px}.auth-input:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px var(--accent-blue-light);outline:none}.auth-input:disabled{background:var(--bg-card-hover)}.auth-error{color:var(--accent-red);background:var(--accent-red-light);border-radius:var(--radius-md);margin-bottom:16px;padding:10px 14px;font-size:14px}.auth-submit{height:50px;font-size:16px;font-weight:600;font-family:var(--font-sans);color:var(--text-white);background:var(--accent-blue);border-radius:var(--radius-md);cursor:pointer;transition:background var(--transition-fast);border:none}.auth-submit:hover:not(:disabled){background:var(--accent-blue-dark)}.auth-submit:disabled{opacity:.7;cursor:wait}