body { padding: 20px; }
.container { max-width: 600px; margin: 0 auto; }
.header { display: flex; align-items: center; margin-bottom: 25px; }
.header a { color: #3498db; text-decoration: none; margin-right: 15px; font-size: 15px; }
.header h1 { color: #333; font-size: 22px; }
.upload-box { background: #fff; border-radius: 12px; padding: 30px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); text-align: center; }
.upload-box .upload-title { font-size: 17px; color: #333; font-weight: bold; margin-bottom: 8px; }
.upload-box .upload-group { font-size: 14px; color: #4CAF50; margin-bottom: 20px; }
.upload-box .upload-hint { font-size: 13px; color: #999; margin-bottom: 20px; }
.file-input-wrap { position: relative; display: inline-block; margin-bottom: 22px; }
.file-input-wrap input[type="file"] { position: absolute; top: 0; left: 0; width: 100%; height: 100%; opacity: 0; cursor: pointer; }
.file-input-label { display: inline-flex; align-items: center; gap: 8px; padding: 12px 30px; border: 2px dashed #ccc; border-radius: 8px; color: #888; font-size: 14px; transition: all 0.25s; background: #fafafa; }
.file-input-wrap:hover .file-input-label { border-color: #4CAF50; color: #4CAF50; background: #f6fbf6; }
.upload-btn { background: linear-gradient(135deg, #4CAF50, #66BB6A); color: #fff; border: none; padding: 11px 40px; border-radius: 8px; font-size: 15px; cursor: pointer; box-shadow: 0 3px 10px rgba(76,175,80,0.3); transition: all 0.25s; display: block; margin: 0 auto; }
.upload-btn:hover { background: linear-gradient(135deg, #43A047, #5cb85c); box-shadow: 0 4px 14px rgba(76,175,80,0.4); transform: translateY(-1px); }
.upload-btn:active { transform: translateY(0); box-shadow: 0 2px 6px rgba(76,175,80,0.3); }
.upload-btn:disabled { background: #bbb; box-shadow: none; cursor: not-allowed; transform: none; }
.file-list { text-align: left; margin-top: 20px; border-top: 1px solid #eee; padding-top: 16px; display: none; }
.file-list .file-list-title { font-size: 14px; color: #555; font-weight: bold; margin-bottom: 10px; }
.file-list .file-item { display: flex; align-items: center; padding: 8px 10px; border-radius: 6px; margin-bottom: 6px; background: #f9f9f9; }
.file-list .file-item:nth-child(even) { background: #f3f3f3; }
.file-list .file-item .file-name { flex: 1; font-size: 13px; color: #333; word-break: break-all; margin-right: 10px; }
.file-list .file-item .file-size { font-size: 12px; color: #999; white-space: nowrap; }
.file-list .file-summary { font-size: 13px; color: #888; margin-top: 10px; text-align: right; }
.overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.6); z-index: 1000; justify-content: center; align-items: center; }
.overlay.active { display: flex; }
.overlay .progress-box { background: #fff; border-radius: 12px; padding: 30px 40px; text-align: center; min-width: 320px; box-shadow: 0 4px 20px rgba(0,0,0,0.3); }
.overlay .progress-box h3 { color: #333; margin-bottom: 18px; font-size: 18px; }
.overlay .progress-bar-wrap { background: #e0e0e0; border-radius: 10px; height: 20px; overflow: hidden; margin-bottom: 12px; }
.overlay .progress-bar { height: 100%; width: 0%; background: linear-gradient(90deg, #4CAF50, #66BB6A); border-radius: 10px; transition: width 0.2s ease; }
.overlay .progress-text { color: #666; font-size: 14px; }