:root{--primary-color:#3b82f6;--primary-hover:#2563eb;--primary-active:#1d4ed8;--primary-disabled:#93c5fd;--secondary-color:#4b5563;--secondary-bg:#fff;--secondary-border:#e5e7eb;--secondary-hover:#f3f4f6;--secondary-disabled:#9ca3af;--success-color:#10b981;--success-bg:#ecfdf5;--warning-color:#f59e0b;--warning-bg:#fef3c7;--error-color:#ef4444;--error-bg:#fee2e2;--container-bg:#fff;--content-bg:#fff;--text-primary:#111827;--text-secondary:#4b5563;--text-disabled:#9ca3af;--border-color:#e2e8f0;--shadow-color:rgba(0,0,0,.1);--dark-container-bg:#1e293b;--dark-content-bg:#1e293b;--dark-primary-color:#2563eb;--dark-primary-hover:#1d4ed8;--dark-primary-disabled:#3b82f6;--dark-secondary-color:#e5e7eb;--dark-secondary-bg:#1f2937;--dark-secondary-border:#374151;--dark-secondary-hover:#374151;--dark-secondary-disabled:#6b7280;--dark-text-primary:#e2e8f0;--dark-text-secondary:#94a3b8;--dark-border-color:#334155;--dark-shadow-color:rgba(0,0,0,.3)}.merge-tool-container{background-color:var(--container-bg);border-radius:12px;box-shadow:0 10px 25px -5px var(--shadow-color),0 10px 10px -5px var(--shadow-color);overflow:hidden;transition:all .3s ease;border:1px solid var(--border-color);height:100%;display:flex;flex-direction:column}.dark .merge-tool-container{background-color:var(--dark-container-bg);border-color:var(--dark-border-color);box-shadow:0 10px 25px -5px var(--dark-shadow-color),0 10px 10px -5px var(--dark-shadow-color)}.merge-stepper{display:flex;justify-content:space-between;margin-bottom:2rem;position:relative;z-index:1;padding:1.5rem 2rem 1rem;border-bottom:1px solid var(--border-color);background-color:var(--container-bg)}.dark .merge-stepper{border-bottom-color:var(--dark-border-color);background-color:var(--dark-container-bg)}.step-connection{flex:1;height:2px;background-color:#e5e7eb;margin:1rem .25rem;position:relative;transition:background-color .3s ease}.step-connection.completed{background-color:var(--primary-color)}.dark .step-connection{background-color:#475569}.dark .step-connection.completed{background-color:var(--dark-primary-color)}.step-item{flex-direction:column;z-index:2;width:120px}.step-circle,.step-item{display:flex;align-items:center;position:relative}.step-circle{width:36px;height:36px;border-radius:50%;background-color:#f3f4f6;color:#6b7280;justify-content:center;font-weight:600;transition:all .2s ease;border:1px solid #e5e7eb;margin:0 auto;font-size:.875rem}.step-circle.active{transform:scale(1.1);box-shadow:0 0 0 4px rgba(59,130,246,.2)}.step-circle.active,.step-circle.completed{background-color:var(--primary-color);color:#fff;border-color:var(--primary-color)}.dark .step-circle{background-color:#334155;color:#cbd5e1;border-color:#475569}.dark .step-circle.active{box-shadow:0 0 0 4px rgba(37,99,235,.3)}.dark .step-circle.active,.dark .step-circle.completed{background-color:var(--dark-primary-color);border-color:var(--dark-primary-color)}.step-label{margin-top:.5rem;font-size:.75rem;font-weight:500;color:#6b7280;text-align:center;transition:color .2s ease;white-space:nowrap}.step-label.active{color:var(--primary-color);font-weight:600}.dark .step-label{color:#94a3b8}.dark .step-label.active{color:#60a5fa}.merge-step-content{flex:1;padding:2rem;overflow-y:auto;background-color:var(--content-bg)}.dark .merge-step-content{background-color:var(--dark-content-bg);color:var(--dark-text-primary)}.merge-stats-card{background-color:#f8fafc;border:1px solid #e2e8f0;border-radius:.5rem;padding:1rem;margin:1rem 0;transition:all .2s ease}.dark .merge-stats-card{background-color:#0f172a;border-color:#334155}.merge-stats-title{font-size:.875rem;font-weight:600;color:#374151;margin-bottom:.5rem}.dark .merge-stats-title{color:#e2e8f0}.merge-stats-content{font-size:.875rem;color:#6b7280;line-height:1.5}.dark .merge-stats-content{color:#cbd5e1}.merge-review-panel{background-color:#fff;border:1px solid #e5e7eb;border-radius:.75rem;padding:1.5rem;box-shadow:0 1px 3px rgba(0,0,0,.05)}.dark .merge-review-panel{background-color:#1e293b;border-color:#334155;box-shadow:0 1px 3px rgba(0,0,0,.2)}.merge-summary-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1rem;margin:1rem 0}.merge-stat-item{text-align:center;padding:.75rem;background-color:#f8fafc;border-radius:.5rem;border:1px solid #e2e8f0}.dark .merge-stat-item{background-color:#0f172a;border-color:#334155}.merge-stat-value{font-size:1.25rem;font-weight:600;color:var(--primary-color)}.dark .merge-stat-value{color:var(--dark-primary-color)}.merge-stat-label{font-size:.75rem;color:#6b7280;margin-top:.25rem}.dark .merge-stat-label{color:#94a3b8}.merge-success-state{text-align:center;padding:2rem}.merge-success-icon{width:4rem;height:4rem;margin:0 auto 1rem;background-color:#ecfdf5;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#10b981}.dark .merge-success-icon{background-color:#064e3b;color:#34d399}.merge-success-title{font-size:1.5rem;font-weight:600;color:#111827;margin-bottom:.5rem}.dark .merge-success-title{color:#f1f5f9}.merge-success-description{font-size:1rem;color:#6b7280;margin-bottom:1.5rem}.dark .merge-success-description{color:#94a3b8}.merge-result-info{display:flex;justify-content:center;gap:2rem;margin:1.5rem 0;font-size:.875rem;color:#6b7280}.dark .merge-result-info{color:#94a3b8}.merge-btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;font-size:.875rem;font-weight:500;color:#fff;background-color:var(--primary-color);border:none;border-radius:.5rem;cursor:pointer;transition:all .2s ease;box-shadow:0 1px 2px var(--shadow-color);min-width:120px}.merge-btn:hover{background-color:var(--primary-hover);transform:translateY(-1px);box-shadow:0 4px 6px -1px var(--shadow-color),0 2px 4px -1px var(--shadow-color)}.merge-btn:active{transform:translateY(0);box-shadow:0 1px 3px var(--shadow-color)}.merge-btn:disabled{background-color:var(--primary-disabled);cursor:not-allowed;transform:none;box-shadow:none;opacity:.7}.merge-btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;font-size:.875rem;font-weight:500;color:var(--secondary-color);background-color:var(--secondary-bg);border:1px solid var(--secondary-border);border-radius:.5rem;cursor:pointer;transition:all .2s ease;box-shadow:0 1px 2px var(--shadow-color);min-width:120px}.merge-btn-secondary:hover{background-color:var(--secondary-hover);transform:translateY(-1px);box-shadow:0 4px 6px -1px var(--shadow-color),0 2px 4px -1px var(--shadow-color)}.merge-btn-secondary:active{transform:translateY(0);box-shadow:0 1px 3px var(--shadow-color)}.merge-btn-secondary:disabled{background-color:var(--secondary-disabled);cursor:not-allowed;transform:none;box-shadow:none;opacity:.7}.dark .merge-btn{background-color:var(--dark-primary-color);box-shadow:0 1px 2px var(--dark-shadow-color)}.dark .merge-btn:hover{background-color:var(--dark-primary-hover);box-shadow:0 4px 6px -1px var(--dark-shadow-color),0 2px 4px -1px var(--dark-shadow-color)}.dark .merge-btn:disabled{background-color:var(--dark-primary-disabled);opacity:.5}.dark .merge-btn-secondary{color:var(--dark-secondary-color);background-color:var(--dark-secondary-bg);border-color:var(--dark-secondary-border);box-shadow:0 1px 2px var(--dark-shadow-color)}.dark .merge-btn-secondary:hover{background-color:var(--dark-secondary-hover);box-shadow:0 4px 6px -1px var(--dark-shadow-color),0 2px 4px -1px var(--dark-shadow-color)}.dark .merge-btn-secondary:disabled{background-color:var(--dark-secondary-disabled);opacity:.5}.merge-step-navigation{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 2rem;border-top:1px solid var(--border-color);background-color:var(--container-bg)}.dark .merge-step-navigation{border-top-color:var(--dark-border-color);background-color:var(--dark-container-bg)}.step-enter{opacity:0;transform:translateX(20px)}.step-enter-active{transition:opacity .3s,transform .3s}.step-enter-active,.step-exit{opacity:1;transform:translateX(0)}.step-exit-active{opacity:0;transform:translateX(-20px);transition:opacity .3s,transform .3s}.merge-loading-overlay{position:fixed;inset:0;background-color:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:50;backdrop-filter:blur(4px)}.dark .merge-loading-overlay{background-color:rgba(0,0,0,.7)}.merge-loading-card{background-color:#fff;border-radius:12px;padding:2rem;box-shadow:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -2px rgba(0,0,0,.05);text-align:center;max-width:300px;width:100%}.dark .merge-loading-card{background-color:#1e293b;color:#f1f5f9;box-shadow:0 10px 15px -3px rgba(0,0,0,.3),0 4px 6px -2px rgba(0,0,0,.15)}.merge-spinner{width:48px;height:48px;border:3px solid #bae6fd;border-top:3px solid var(--primary-color);border-radius:50%;margin:0 auto 1rem;animation:spin 1s linear infinite}.dark .merge-spinner{border-color:#0f172a;border-top-color:var(--dark-primary-color)}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}@media (max-width:768px){.merge-stepper{padding:1rem;overflow-x:auto}.step-item{width:80px;flex-shrink:0}.step-label{font-size:.625rem}.merge-step-content,.merge-step-navigation{padding:1rem}}.merge-flow-diagram{padding:1rem;background:linear-gradient(135deg,#f8fafc,#f1f5f9);border-radius:.75rem;border:1px solid #e2e8f0}.dark .merge-flow-diagram{background:linear-gradient(135deg,#0f172a,#1e293b);border-color:#334155}