:root{--primary: #3b82f6;--primary-hover: #2563eb;--bg: #f8fafc;--card-bg: #ffffff;--text-main: #1e293b;--text-sub: #64748b;--border: #e2e8f0;--success: #22c55e;--error: #ef4444;--radius: 12px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,sans-serif;background:var(--bg);color:var(--text-main);display:flex;flex-direction:column;align-items:center;min-height:100vh;padding:40px 20px}header{text-align:center;margin-bottom:32px}header h1{font-size:2rem;font-weight:700;margin-bottom:6px}header p{color:var(--text-sub);font-size:1rem}#app{width:100%;max-width:760px;background:var(--card-bg);border-radius:var(--radius);box-shadow:0 4px 24px #00000014;padding:40px;min-height:420px;display:flex;flex-direction:column}.state-section{display:none;flex-direction:column;align-items:center;justify-content:center;flex-grow:1;width:100%}.state-section.active{display:flex}#drop-zone{width:100%;min-height:260px;border:2px dashed var(--border);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:border-color .2s,background .2s}#drop-zone:hover,#drop-zone.dragover{border-color:var(--primary);background:#eff6ff}.upload-content{text-align:center;pointer-events:none}.upload-icon{width:56px;height:56px;color:var(--primary);margin-bottom:16px}.main-text{font-size:1.2rem;font-weight:600;margin-bottom:6px}.sub-text{color:var(--text-sub);margin-bottom:8px}.hint-text{font-size:.85rem;color:#94a3b8}.hint-text.muted{margin-top:8px}#file-input{display:none}#multi-drop-zone{width:100%;border:2px dashed var(--border);border-radius:var(--radius);padding:16px;text-align:center;cursor:pointer;margin-bottom:16px;transition:border-color .2s,background .2s}#multi-drop-zone:hover,#multi-drop-zone.dragover{border-color:var(--primary);background:#eff6ff}.upload-content.small .sub-text{margin:0}#thumbnail-list{width:100%;display:flex;flex-wrap:wrap;gap:10px;margin-bottom:20px;min-height:80px}.thumb-card{position:relative;width:90px;height:90px;border:1px solid var(--border);border-radius:8px;overflow:hidden;cursor:grab;-webkit-user-select:none;user-select:none}.thumb-card.dragging{opacity:.4}.thumb-card.touch-drag-source{opacity:.25}.thumb-card.drag-over,.thumb-card.touch-drag-target{border:2px solid var(--primary)}.thumb-card img{width:100%;height:100%;object-fit:cover}.thumb-remove{position:absolute;top:2px;right:2px;background:#0000008c;color:#fff;border:none;border-radius:50%;width:20px;height:20px;font-size:12px;cursor:pointer;line-height:20px;text-align:center;padding:0}.thumb-remove:hover{background:var(--error)}.thumb-order{position:absolute;bottom:2px;left:4px;font-size:11px;color:#fff;background:#00000080;border-radius:3px;padding:0 4px}.touch-drag-ghost{position:fixed;z-index:1000;pointer-events:none;border-radius:8px;overflow:hidden;box-shadow:0 10px 28px #0f172a47;transform:translate(-50%,-50%) scale(1.04)}body.touch-dragging{-webkit-user-select:none;user-select:none}.file-info-card{width:100%;display:flex;align-items:center;background:#f1f5f9;border-radius:var(--radius);padding:16px 20px;margin-bottom:24px}.file-icon{width:32px;height:32px;color:var(--text-sub);flex-shrink:0;margin-right:14px}.file-details{flex-grow:1;min-width:0}.file-name{display:block;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-size{font-size:.85rem;color:var(--text-sub)}.remove-file{background:none;border:none;color:var(--text-sub);cursor:pointer;font-size:18px;padding:4px 8px;transition:color .2s;flex-shrink:0}.remove-file:hover{color:var(--error)}.format-selector{width:100%;display:flex;align-items:center;gap:16px;margin-bottom:24px;flex-wrap:wrap}.format-label{font-weight:600;white-space:nowrap}.format-group{display:flex;gap:8px;flex-wrap:wrap}.format-btn{padding:7px 18px;border:1px solid var(--border);background:#fff;border-radius:20px;cursor:pointer;font-size:.9rem;transition:all .15s}.format-btn:hover{border-color:var(--primary);color:var(--primary)}.format-btn.selected{background:var(--primary);color:#fff;border-color:var(--primary)}.main-btn{width:100%;padding:14px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);font-size:1rem;font-weight:600;cursor:pointer;transition:background .2s;display:flex;align-items:center;justify-content:center;gap:8px}.main-btn:hover:not(:disabled){background:var(--primary-hover)}.main-btn:disabled{background:#cbd5e1;cursor:not-allowed}.main-btn.secondary-main-btn{background:#64748b}.main-btn.secondary-main-btn:hover{background:#475569}.secondary-btn{margin-top:14px;background:none;border:none;color:var(--text-sub);text-decoration:underline;cursor:pointer;font-size:.9rem}.btn-row{display:flex;gap:12px;width:100%}.process-text{font-size:1.1rem;font-weight:600;margin-bottom:16px}.progress-container{width:100%;max-width:420px;display:flex;align-items:center;gap:10px;margin-bottom:10px}.progress-bar-bg{flex-grow:1;height:8px;background:#e2e8f0;border-radius:4px;overflow:hidden}.progress-bar-fill{height:100%;background:var(--primary);width:0%;transition:width .3s}.progress-bar-fill.indeterminate{background:linear-gradient(90deg,var(--primary) 0%,#93c5fd 50%,var(--primary) 100%);background-size:200% 100%;animation:scan 1.5s infinite linear;width:100%}@keyframes scan{0%{background-position:200% 0}to{background-position:-200% 0}}.progress-pct{font-size:.85rem;color:var(--text-sub);width:36px;text-align:right}#stage-text{margin-bottom:6px;min-height:1.2em}.status-icon{width:72px;height:72px;margin-bottom:16px}.success-icon{color:var(--success)}.error-icon{color:var(--error)}#state-success h2,#state-error h2{margin-bottom:20px;font-size:1.5rem}.error-detail{color:var(--text-sub);margin-bottom:20px;max-width:400px;text-align:center}footer{margin-top:32px;text-align:center;color:var(--text-sub);font-size:.82rem;line-height:1.9}@media (max-width: 520px){body{padding:20px 12px 28px}header{margin-bottom:20px}header h1{font-size:1.5rem}header p{font-size:.92rem}#app{padding:20px 14px;min-height:360px;border-radius:10px}#drop-zone{min-height:200px;padding:20px 12px}.upload-icon{width:46px;height:46px;margin-bottom:12px}.main-text{font-size:1.05rem}.sub-text{font-size:.92rem}.hint-text{font-size:.8rem;line-height:1.5}#multi-drop-zone{padding:14px 12px}#thumbnail-list{gap:8px}.thumb-card{width:calc(33.333% - 6px);min-width:92px;max-width:112px;height:92px}.thumb-remove{top:4px;right:4px;width:32px;height:32px;font-size:18px;line-height:32px;touch-action:manipulation}.thumb-order{bottom:4px}.file-info-card{padding:14px}.format-selector{gap:10px;margin-bottom:18px}.format-btn{min-height:40px;padding:8px 16px}.main-btn{min-height:46px}.secondary-btn{min-height:40px}.btn-row{flex-direction:column}.progress-container{gap:8px}footer{margin-top:20px;font-size:.76rem;line-height:1.7}}