.upload-zone{border:2px dashed var(--border);border-radius:12px;padding:40px 24px;text-align:center;cursor:pointer;transition:border-color 0.2s;background:var(--bg3)}
.upload-zone:hover{border-color:var(--bh)}
.upload-zone i{font-size:36px;color:var(--t3);display:block;margin-bottom:14px}
.upload-zone p{font-size:14px;color:var(--t2);margin-bottom:6px}
.upload-zone span{font-size:12px;color:var(--t3)}
.pdf-preview{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:10px}
.pdf-thumb{position:relative;border-radius:8px;overflow:hidden;border:1px solid var(--border);background:var(--bg3)}
.pdf-thumb img{width:100%;height:90px;object-fit:cover}
.pdf-thumb-rm{position:absolute;top:4px;right:4px;width:22px;height:22px;background:rgba(0,0,0,0.7);border:none;border-radius:50%;color:white;font-size:11px;cursor:pointer;display:flex;align-items:center;justify-content:center}
.pdf-thumb-num{position:absolute;bottom:4px;left:6px;font-size:10px;font-weight:700;color:white;background:rgba(0,0,0,0.6);border-radius:4px;padding:1px 5px}