*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f8f9fb;--surface: #ffffff;--border: #e2e5ea;--text: #1a1d23;--text-secondary: #5f6672;--primary: #2563eb;--primary-hover: #1d4ed8;--danger: #dc2626;--danger-hover: #b91c1c;--success: #16a34a;--radius: 8px;--shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.5}.app{min-height:100vh;display:flex;flex-direction:column}.header{background:var(--surface);border-bottom:1px solid var(--border);padding:12px 24px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100}.header h1{font-size:18px;font-weight:600}.header-right{display:flex;align-items:center;gap:12px}.user-info{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-secondary)}.user-info img{width:28px;height:28px;border-radius:50%}.main{display:flex;flex:1}.sidebar{width:240px;background:var(--surface);border-right:1px solid var(--border);padding:16px;flex-shrink:0}.content{flex:1;padding:24px;overflow-x:auto}.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;flex-direction:column;gap:24px}.login-page h1{font-size:24px}.login-page p{color:var(--text-secondary)}.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);font-size:14px;cursor:pointer;transition:all .15s;color:var(--text)}.btn:hover{background:var(--bg)}.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-primary:hover{background:var(--primary-hover)}.btn-danger{color:var(--danger);border-color:var(--danger)}.btn-danger:hover{background:#fef2f2}.btn-sm{padding:4px 10px;font-size:13px}.btn-text{border:none;background:none;padding:4px 8px}.btn-text:hover{background:var(--bg)}.toolbar{display:flex;align-items:center;gap:8px;margin-bottom:16px;flex-wrap:wrap}.toolbar .search-input{flex:1;min-width:200px;padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px;outline:none}.toolbar .search-input:focus{border-color:var(--primary)}.breadcrumbs{display:flex;align-items:center;gap:4px;margin-bottom:16px;font-size:14px;color:var(--text-secondary)}.breadcrumbs button{background:none;border:none;color:var(--primary);cursor:pointer;font-size:14px;padding:2px 4px;border-radius:4px}.breadcrumbs button:hover{background:#eff6ff}.breadcrumbs .sep{color:var(--border)}.file-table{width:100%;border-collapse:collapse}.file-table th{text-align:left;font-size:12px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;padding:8px 12px;border-bottom:2px solid var(--border)}.file-table td{padding:10px 12px;border-bottom:1px solid var(--border);font-size:14px;vertical-align:middle}.file-table tr:hover td{background:#f8fafc}.file-name{display:flex;align-items:center;gap:8px;font-weight:500}.file-icon{font-size:18px;flex-shrink:0}.file-size,.file-date{color:var(--text-secondary);font-size:13px}.file-actions{display:flex;gap:4px}.upload-zone{border:2px dashed var(--border);border-radius:var(--radius);padding:40px;text-align:center;color:var(--text-secondary);cursor:pointer;transition:all .15s;margin-bottom:24px}.upload-zone.drag-over{border-color:var(--primary);background:#eff6ff;color:var(--primary)}.upload-zone p{margin-top:8px;font-size:14px}.upload-zone .upload-icon{font-size:36px}.preview-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:200;display:flex;align-items:center;justify-content:center}.preview-panel{background:var(--surface);border-radius:12px;width:90vw;height:85vh;display:flex;flex-direction:column;box-shadow:0 20px 60px #0003}.preview-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border)}.preview-header h3{font-size:15px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.preview-iframe{flex:1;border:none;border-radius:0 0 12px 12px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;z-index:300;display:flex;align-items:center;justify-content:center}.modal{background:var(--surface);border-radius:12px;padding:24px;width:400px;max-width:90vw;box-shadow:0 20px 60px #0003}.modal h3{margin-bottom:16px}.modal input[type=text]{width:100%;padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px;margin-bottom:16px;outline:none}.modal input[type=text]:focus{border-color:var(--primary)}.modal-actions{display:flex;justify-content:flex-end;gap:8px}.toast-container{position:fixed;bottom:24px;right:24px;z-index:400;display:flex;flex-direction:column;gap:8px}.toast{padding:12px 20px;border-radius:var(--radius);font-size:14px;color:#fff;box-shadow:var(--shadow);animation:slideIn .2s ease-out}.toast-success{background:var(--success)}.toast-error{background:var(--danger)}.toast-info{background:var(--primary)}@keyframes slideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.folder-list{list-style:none}.folder-item{padding:8px 12px;border-radius:var(--radius);cursor:pointer;font-size:14px;display:flex;align-items:center;gap:8px;transition:background .1s}.folder-item:hover{background:var(--bg)}.folder-item.active{background:#eff6ff;color:var(--primary);font-weight:500}.sidebar h3{font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:var(--text-secondary);margin-bottom:8px}.checkbox{width:16px;height:16px;cursor:pointer;accent-color:var(--primary)}.empty-state{text-align:center;padding:60px 20px;color:var(--text-secondary)}.empty-state .empty-icon{font-size:48px;margin-bottom:12px}.empty-state h3{color:var(--text);margin-bottom:8px}@media (max-width: 768px){.sidebar{display:none}.header h1{font-size:16px}.content{padding:16px}}