*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft YaHei,sans-serif;background:#f5f5f5;min-height:100vh}#root{min-height:100vh}.app{min-height:100vh;display:flex;flex-direction:column}.header{background:#fff;border-bottom:1px solid #e0e0e0;padding:1rem 2rem}.header-content{max-width:1400px;margin:0 auto;display:flex;justify-content:space-between;align-items:center}.header h1{color:#333;font-size:1.5rem;font-weight:600}.header-actions{display:flex;gap:1rem}.header-btn{background:none;border:none;color:#666;font-size:.9rem;cursor:pointer;display:flex;align-items:center;gap:.3rem;padding:.5rem .8rem;border-radius:4px;transition:all .2s}.header-btn:hover{background:#f5f5f5;color:#333}.main-container{flex:1;max-width:1400px;margin:0 auto;padding:2rem;width:100%}.settings-bar{background:#fff;border:1px solid #e0e0e0;border-radius:8px;padding:1.5rem;margin-bottom:1.5rem;display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1rem}.setting-field{display:flex;flex-direction:column;gap:.5rem}.setting-field label{font-size:.9rem;color:#555;font-weight:500}.setting-field input,.setting-field select{padding:.6rem;border:1px solid #ddd;border-radius:4px;font-size:.95rem;transition:border-color .2s}.setting-field input:focus,.setting-field select:focus{outline:none;border-color:#667eea}.upload-area-large{background:#fff;border:2px dashed #ddd;border-radius:8px;padding:4rem 2rem;text-align:center;cursor:pointer;transition:all .3s;min-height:200px;display:flex;align-items:center;justify-content:center}.upload-area-large:hover{border-color:#667eea;background:#667eea05}.upload-area-large.dragging{border-color:#667eea;background:#667eea0d;transform:scale(1.01)}.upload-placeholder{display:flex;flex-direction:column;align-items:center;gap:.8rem}.upload-icon-large{font-size:4rem;color:#667eea}.upload-text-large{font-size:1.5rem;color:#999}.upload-hint-large{font-size:.95rem;color:#bbb}.upload-info{display:flex;flex-direction:column;align-items:center;gap:.5rem}.upload-count{font-size:1.3rem;color:#666}.action-buttons{display:flex;gap:1rem;justify-content:center;margin:1.5rem 0}.btn-merge,.btn-download{padding:.8rem 2.5rem;border:none;border-radius:6px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s}.btn-merge{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.btn-merge:hover{transform:translateY(-2px);box-shadow:0 6px 20px #667eea66}.btn-download{background:linear-gradient(135deg,#f093fb,#f5576c);color:#fff}.btn-download:hover{transform:translateY(-2px);box-shadow:0 6px 20px #f5576c66}.merge-result{margin-top:2rem}.result-hint{text-align:center;font-size:1.1rem;color:#666;margin-bottom:1rem}.result-container{background:#fff;border:1px solid #e0e0e0;border-radius:8px;padding:1.5rem;overflow:auto;max-width:100%}.result-canvas{max-width:100%;height:auto;display:block;margin:0 auto}.image-list-section{margin-top:2rem;background:#fff;border:1px solid #e0e0e0;border-radius:8px;padding:1.5rem}.section-title{font-size:1.1rem;color:#333;margin-bottom:1rem;font-weight:600}.image-list-horizontal{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1rem;max-height:400px;overflow-y:auto}.image-card{position:relative;background:#f9f9f9;border-radius:8px;overflow:hidden;border:2px solid transparent;transition:all .3s;cursor:move}.image-card:hover{border-color:#667eea;transform:translateY(-2px);box-shadow:0 4px 12px #0000001a}.image-card-img{width:100%;height:150px;object-fit:cover;display:block}.image-card-info{padding:.8rem;display:flex;align-items:center;gap:.5rem}.image-card-number{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:600;flex-shrink:0}.image-card-name{flex:1;font-size:.85rem;color:#666;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.image-card-delete{position:absolute;top:.5rem;right:.5rem;width:28px;height:28px;border:none;background:#ffffffe6;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1rem;color:#999;transition:all .2s}.image-card-delete:hover{background:#ff4757;color:#fff}.footer{background:#fff;border-top:1px solid #e0e0e0;padding:1.5rem 2rem;text-align:center;color:#666;font-size:.9rem;margin-top:auto}@media (max-width: 768px){.header-content{flex-direction:column;gap:1rem}.header-actions{flex-wrap:wrap;justify-content:center}.settings-bar{grid-template-columns:repeat(2,1fr)}.image-list-horizontal{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}}