.file-category{border:1px solid var(--border);border-radius:10px;margin:16px 0;background:#fff;overflow:hidden}
.file-category summary{cursor:pointer;display:flex;align-items:center;gap:10px;padding:15px 18px;font-size:15px;font-weight:700;background:#fafafb;list-style:none}
.file-category summary::before{content:'›';font-size:21px;font-weight:400;color:#7a7a87;transform:rotate(0deg);transition:transform .15s}
.file-category[open] summary::before{transform:rotate(90deg)}
.file-category summary::-webkit-details-marker{display:none}
.file-count{font-size:12px;border-radius:20px;min-width:25px;padding:3px 7px;text-align:center;background:#e9e9ef;color:#6a6a78;margin-left:auto}
.file-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px;padding:18px}
.file-card{min-width:0;border:1px solid var(--border);border-radius:9px;overflow:hidden}
.file-preview{display:block;width:100%;min-width:0;border:0;border-radius:0;padding:0;background:#fff;text-align:left;font-weight:500}
.file-preview:hover{background:#fff5f6}
.file-thumb{height:145px;display:flex;align-items:center;justify-content:center;background:#f2f2f5;color:#71717e;overflow:hidden;font-size:12px;padding:8px;text-align:center}
.file-thumb img{display:block;max-width:100%;max-height:100%;object-fit:contain}
.file-kind{font-size:24px;letter-spacing:1px;color:#a41a26;background:#fff;border:1px solid #e7e7ed;border-radius:6px;padding:20px 14px;box-shadow:0 3px 10px #00000005}
.file-name{display:block;padding:12px 12px 6px;font-size:13px;white-space:nowrap;text-overflow:ellipsis;overflow:hidden;min-width:0}
.file-card-meta{display:flex;align-items:center;justify-content:space-between;gap:5px;padding:2px 10px 10px;font-size:11px;color:#858590}
.file-card-meta button{font-size:11px;min-height:30px;padding:5px 7px;background:transparent;border-color:transparent;font-weight:500;color:#8f202a}
.file-card-meta button:hover{background:#fff0f1}
.file-empty{font-size:13px;color:var(--muted);margin:0;padding:14px 18px}
dialog.file-viewer{width:min(94vw,1400px);height:90vh;max-height:94vh;border:0;border-radius:12px;padding:18px;overflow:hidden}
.file-viewer-header{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:60px;padding-bottom:12px;border-bottom:1px solid var(--border)}
.file-viewer-header>div{min-width:0;display:grid;gap:5px}
.file-viewer-header strong{display:block;white-space:nowrap;text-overflow:ellipsis;overflow:hidden;font-size:15px}
.file-viewer-category{font-size:11px;letter-spacing:1px;color:var(--red);font-weight:700;text-transform:uppercase}
.file-viewer-area{height:calc(100% - 122px);overflow:auto;display:flex;align-items:center;justify-content:center;background:#f5f5f7;margin-top:10px;padding:8px}
.file-viewer-area img{display:block;max-width:100%;max-height:100%;object-fit:contain}
.file-viewer-area iframe{width:100%;height:100%;border:0;background:#fff}
.file-viewer-controls{display:flex;align-items:center;justify-content:center;gap:14px;margin-top:12px}
.file-viewer-controls>span{font-size:13px;color:var(--muted);min-width:36px;text-align:center}
.file-viewer-controls button:last-child{margin-left:auto}
@media(max-width:600px){.file-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;padding:12px}.file-thumb{height:115px}.file-card-meta{flex-wrap:wrap}.file-category summary{padding:13px 14px}.file-viewer-header{gap:10px}.file-viewer-header button{font-size:12px;min-height:38px;padding:8px}.file-viewer-controls{gap:8px;flex-wrap:wrap}.file-viewer-controls button{font-size:12px;padding:8px 10px;min-height:38px}.file-viewer-controls button:last-child{margin-left:0}.file-viewer-area{height:calc(100% - 154px)}dialog.file-viewer{padding:12px}}