*{box-sizing:border-box}body{margin:0;background:#f7f7f8;color:#1a1a1a;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}.app{max-width:1100px;margin:0 auto;padding:32px 20px 60px}.header h1{margin:0 0 4px;font-size:28px}.subtitle{margin:0 0 24px;color:#666}.upload-form{display:flex;gap:12px;align-items:center;background:#fff;border:1px solid #e5e5e5;border-radius:10px;padding:16px;margin-bottom:16px}.upload-form button{background:#1a1a1a;color:#fff;border:none;border-radius:8px;padding:10px 18px;cursor:pointer;font-size:14px}.upload-form button:disabled{opacity:.5;cursor:default}.upload-form.drag-over{border-color:#1a1a1a;background:#fafafa}.drop-hint{font-size:13px;color:#999}.status{padding:10px 14px;border-radius:8px;margin-bottom:16px;font-size:14px}.status-error{background:#fef3f2;color:#b42318;border:1px solid #fecdca}.status-success{background:#ecfdf3;color:#027a48;border:1px solid #abefc6}.layout{display:grid;grid-template-columns:240px 1fr;gap:20px}.file-list{background:#fff;border:1px solid #e5e5e5;border-radius:10px;padding:16px;align-self:start}.file-list h2,.preview h2{font-size:14px;text-transform:uppercase;letter-spacing:.03em;color:#666;margin:0 0 12px}.file-list ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}.file-row{display:flex;align-items:stretch;gap:4px}.file-item{flex:1;min-width:0;text-align:left;background:none;border:none;padding:8px 10px;border-radius:6px;cursor:pointer;font-size:14px;display:flex;flex-direction:column;gap:2px}.file-name{word-break:break-all}.file-meta{font-size:11px;color:#999}.file-item.active .file-meta{color:#ccc}.file-item:hover{background:#f2f2f2}.file-item.active{background:#1a1a1a;color:#fff}.file-delete{background:none;border:none;color:#b42318;cursor:pointer;font-size:13px;padding:0 6px;border-radius:6px}.file-delete:hover{background:#fef3f2}.preview{background:#fff;border:1px solid #e5e5e5;border-radius:10px;padding:16px;min-height:300px}.preview-header{display:flex;align-items:center;justify-content:space-between}.reload-btn{background:none;border:1px solid #ddd;border-radius:6px;padding:4px 10px;font-size:13px;cursor:pointer}.reload-btn:hover{background:#f2f2f2}.preview-frame{width:100%;height:500px;border:1px solid #eee;border-radius:8px}.source-panel{margin-top:12px;font-size:13px}.source-panel summary{cursor:pointer;color:#666;margin-bottom:8px}.empty{color:#999;font-size:14px}@media (max-width: 700px){.layout{grid-template-columns:1fr}}