:root{--primary:#4f6ef7;--primary-hover:#3b5de7;--primary-light:#eef1ff;--bg:#f5f6fa;--bg-white:#fff;--sidebar-bg:#fafbfc;--border:#e8eaed;--text:#1a1a2e;--text-secondary:#6b7280;--text-muted:#9ca3af;--hover:#f0f1f5;--danger:#ef4444;--danger-hover:#dc2626;--success:#10b981;--warning:#f59e0b;--shadow-sm:0 1px 2px #0000000d;--shadow:0 1px 3px #00000014, 0 1px 2px #0000000f;--shadow-lg:0 10px 25px #0000001a;--radius:8px;--radius-sm:6px;--transition:.15s ease;--sidebar-width:240px;--header-height:52px}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-size:14px}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.app-layout{height:100vh;display:flex;overflow:hidden}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background:var(--sidebar-bg);border-right:1px solid var(--border);transition:margin-left var(--transition);z-index:10;flex-direction:column;display:flex}.sidebar-header{border-bottom:1px solid var(--border);height:var(--header-height);align-items:center;gap:10px;padding:16px 20px;display:flex}.sidebar-logo{background:var(--primary);border-radius:var(--radius-sm);color:#fff;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:16px;font-weight:700;display:flex}.sidebar-title{color:var(--text);white-space:nowrap;font-size:16px;font-weight:600}.sidebar-nav{flex:1;padding:8px 0;overflow-y:auto}.sidebar-section{text-transform:uppercase;color:var(--text-muted);letter-spacing:.5px;padding:8px 16px 4px;font-size:11px;font-weight:600}.sidebar-item{border-radius:var(--radius-sm);cursor:pointer;color:var(--text-secondary);transition:all var(--transition);white-space:nowrap;align-items:center;gap:10px;margin:1px 8px;padding:9px 16px;font-size:13.5px;display:flex;position:relative}.sidebar-item:hover{background:var(--hover);color:var(--text)}.sidebar-item.active{background:var(--primary-light);color:var(--primary);font-weight:500}.sidebar-item .icon{text-align:center;flex-shrink:0;width:20px;font-size:18px}.sidebar-item .name{text-overflow:ellipsis;flex:1;overflow:hidden}.sidebar-item .badge{color:var(--text-muted);background:var(--border);border-radius:10px;padding:1px 6px;font-size:11px}.sidebar-footer{border-top:1px solid var(--border);padding:12px 16px}.sidebar-footer .btn{width:100%}.main-content{flex-direction:column;flex:1;min-width:0;display:flex;overflow:hidden}.toolbar{height:var(--header-height);background:var(--bg-white);border-bottom:1px solid var(--border);flex-shrink:0;align-items:center;gap:12px;padding:0 20px;display:flex}.toolbar-left{align-items:center;gap:6px;display:flex}.toolbar-right{align-items:center;gap:8px;margin-left:auto;display:flex}.breadcrumb{flex:1;align-items:center;gap:2px;font-size:14px;display:flex;overflow:hidden}.breadcrumb-item{border-radius:var(--radius-sm);cursor:pointer;color:var(--text-secondary);white-space:nowrap;transition:all var(--transition);padding:4px 8px;font-size:14px}.breadcrumb-item:hover{background:var(--hover);color:var(--text)}.breadcrumb-item.current{color:var(--text);font-weight:500}.breadcrumb-sep{color:var(--text-muted);padding:0 2px;font-size:12px}.btn{border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-white);color:var(--text);cursor:pointer;transition:all var(--transition);white-space:nowrap;justify-content:center;align-items:center;gap:6px;padding:7px 14px;font-family:inherit;font-size:13px;line-height:1.4;display:inline-flex}.btn:hover{background:var(--hover);border-color:#d1d5db}.btn:active{transform:scale(.97)}.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-primary:hover{background:var(--primary-hover);border-color:var(--primary-hover)}.btn-danger{background:var(--danger);color:#fff;border-color:var(--danger)}.btn-danger:hover{background:var(--danger-hover)}.btn-sm{padding:4px 10px;font-size:12px}.btn-icon{border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-white);width:32px;height:32px;color:var(--text-secondary);cursor:pointer;transition:all var(--transition);justify-content:center;align-items:center;padding:0;font-size:16px;display:inline-flex}.btn-icon:hover{background:var(--hover);color:var(--text)}.btn-icon.active{background:var(--primary-light);color:var(--primary);border-color:var(--primary)}.file-area{flex:1;padding:12px 20px;overflow-y:auto}.file-list{flex-direction:column;display:flex}.file-list-header{color:var(--text-muted);border-bottom:1px solid var(--border);background:var(--bg);z-index:2;grid-template-columns:40px 1fr 100px 140px;gap:12px;padding:8px 12px;font-size:12px;font-weight:500;display:grid;position:sticky;top:0}.file-list-header span{cursor:pointer;-webkit-user-select:none;user-select:none;align-items:center;gap:4px;display:flex}.file-list-header span:hover{color:var(--text)}.file-row{border-radius:var(--radius-sm);cursor:pointer;transition:background var(--transition);border-bottom:1px solid #0000;grid-template-columns:40px 1fr 100px 140px;align-items:center;gap:12px;padding:10px 12px;display:grid}.file-row:hover{background:var(--hover)}.file-row.selected{background:var(--primary-light)}.file-row .file-check{justify-content:center;align-items:center;display:flex}.file-row .file-check input[type=checkbox]{width:16px;height:16px;accent-color:var(--primary);cursor:pointer}.file-row .file-icon{align-items:center;gap:10px;min-width:0;display:flex}.file-row .file-icon .icon{text-align:center;flex-shrink:0;width:28px;font-size:22px}.file-row .file-icon .icon.folder{color:#f59e0b}.file-row .file-icon .icon.image{color:#ec4899}.file-row .file-icon .icon.video{color:#8b5cf6}.file-row .file-icon .icon.audio{color:#06b6d4}.file-row .file-icon .icon.pdf{color:#ef4444}.file-row .file-icon .icon.word{color:#3b82f6}.file-row .file-icon .icon.excel{color:#10b981}.file-row .file-icon .icon.ppt{color:#f97316}.file-row .file-icon .icon.code{color:#6366f1}.file-row .file-icon .icon.archive{color:#78716c}.file-row .file-icon .icon.file{color:var(--text-muted)}.file-row .file-icon .file-name{text-overflow:ellipsis;white-space:nowrap;font-size:13.5px;overflow:hidden}.file-row .file-size{color:var(--text-secondary);text-align:right;font-size:13px}.file-row .file-date{color:var(--text-secondary);font-size:13px}.file-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;display:grid}.file-card{border-radius:var(--radius);cursor:pointer;transition:all var(--transition);background:var(--bg-white);border:1px solid #0000;flex-direction:column;align-items:center;padding:16px 8px 12px;display:flex}.file-card:hover{background:var(--hover);border-color:var(--border)}.file-card.selected{background:var(--primary-light);border-color:var(--primary)}.file-card .card-icon{margin-bottom:8px;font-size:42px}.file-card .card-icon.folder{color:#f59e0b}.file-card .card-icon.image{color:#ec4899}.file-card .card-icon.video{color:#8b5cf6}.file-card .card-icon.audio{color:#06b6d4}.file-card .card-icon.pdf{color:#ef4444}.file-card .card-icon.word{color:#3b82f6}.file-card .card-icon.code{color:#6366f1}.file-card .card-icon.file{color:var(--text-muted)}.file-card .card-name{text-align:center;text-overflow:ellipsis;-webkit-line-clamp:2;word-break:break-all;-webkit-box-orient:vertical;width:100%;font-size:12px;line-height:1.4;display:-webkit-box;overflow:hidden}.empty-state{color:var(--text-muted);flex-direction:column;justify-content:center;align-items:center;padding:60px 20px;display:flex}.empty-state .empty-icon{opacity:.5;margin-bottom:16px;font-size:56px}.empty-state .empty-text{margin-bottom:8px;font-size:15px}.empty-state .empty-sub{font-size:13px}.loading-overlay{color:var(--text-muted);justify-content:center;align-items:center;padding:40px;display:flex}.spinner{border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;width:24px;height:24px;margin-right:10px;animation:.6s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.modal-overlay{z-index:100;background:#0006;justify-content:center;align-items:center;animation:.15s fadeIn;display:flex;position:fixed;inset:0}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal{background:var(--bg-white);box-shadow:var(--shadow-lg);border-radius:12px;flex-direction:column;width:90%;max-width:520px;max-height:85vh;animation:.2s slideUp;display:flex}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.modal-lg{max-width:720px}.modal-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:16px 20px;display:flex}.modal-header h3{font-size:16px;font-weight:600}.modal-close{width:28px;height:28px;color:var(--text-muted);cursor:pointer;border-radius:var(--radius-sm);background:0 0;border:none;justify-content:center;align-items:center;font-size:20px;display:flex}.modal-close:hover{background:var(--hover);color:var(--text)}.modal-body{flex:1;padding:20px;overflow-y:auto}.modal-footer{border-top:1px solid var(--border);justify-content:flex-end;gap:8px;padding:12px 20px;display:flex}.form-group{margin-bottom:16px}.form-group label{color:var(--text);margin-bottom:6px;font-size:13px;font-weight:500;display:block}.form-group label .required{color:var(--danger);margin-left:2px}.form-input{border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text);background:var(--bg-white);transition:border-color var(--transition);outline:none;padding:8px 12px;font-family:inherit;font-size:13px}.form-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f6ef71a}.form-input::placeholder{color:var(--text-muted)}.form-select{border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text);background:var(--bg-white);cursor:pointer;outline:none;padding:8px 12px;font-family:inherit;font-size:13px}.storage-type-grid{grid-template-columns:repeat(2,1fr);gap:10px;margin-bottom:16px;display:grid}.storage-type-card{border:2px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:all var(--transition);text-align:center;padding:14px}.storage-type-card:hover,.storage-type-card.selected{border-color:var(--primary);background:var(--primary-light)}.storage-type-card .type-icon{margin-bottom:6px;font-size:28px}.storage-type-card .type-label{font-size:13px;font-weight:500}.storage-type-card .type-desc{color:var(--text-muted);margin-top:4px;font-size:11px}.toast-container{z-index:200;flex-direction:column;gap:8px;display:flex;position:fixed;top:20px;right:20px}.toast{border-radius:var(--radius);background:var(--bg-white);box-shadow:var(--shadow-lg);align-items:center;gap:8px;min-width:260px;padding:12px 16px;font-size:13px;animation:.2s slideIn;display:flex}@keyframes slideIn{0%{opacity:0;transform:translate(100%)}to{opacity:1;transform:translate(0)}}.toast.success{border-left:3px solid var(--success)}.toast.error{border-left:3px solid var(--danger)}.toast.info{border-left:3px solid var(--primary)}.preview-overlay{z-index:150;cursor:pointer;background:#000000d9;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.preview-content{cursor:default;max-width:90vw;max-height:90vh}.preview-content img{object-fit:contain;border-radius:4px;max-width:90vw;max-height:85vh}.preview-content video{border-radius:4px;max-width:90vw;max-height:85vh}.preview-close{color:#fff;cursor:pointer;z-index:151;background:#ffffff26;border:none;border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;font-size:22px;display:flex;position:fixed;top:20px;right:20px}.preview-close:hover{background:#ffffff40}.context-menu{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-lg);z-index:300;min-width:180px;padding:4px;animation:.1s fadeIn;position:fixed}.context-menu-item{border-radius:var(--radius-sm);cursor:pointer;color:var(--text);transition:background var(--transition);align-items:center;gap:8px;padding:8px 12px;font-size:13px;display:flex}.context-menu-item:hover{background:var(--hover)}.context-menu-item.danger{color:var(--danger)}.context-menu-sep{background:var(--border);height:1px;margin:4px 0}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#d1d5db;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#9ca3af}@media (width<=768px){.sidebar{margin-left:calc(var(--sidebar-width) * -1);position:fixed;top:0;bottom:0;left:0}.sidebar.open{box-shadow:var(--shadow-lg);margin-left:0}.file-list-header,.file-row{grid-template-columns:40px 1fr 80px}.file-list-header span:nth-child(4),.file-row .file-date{display:none}.file-grid{grid-template-columns:repeat(auto-fill,minmax(110px,1fr))}}.drop-zone{border:2px dashed var(--primary);z-index:50;color:var(--primary);background:#4f6ef714;justify-content:center;align-items:center;font-size:16px;font-weight:500;display:flex;position:absolute;inset:0}.error-banner{color:var(--danger);border-radius:var(--radius-sm);background:#fef2f2;border:1px solid #fecaca;align-items:center;gap:8px;margin:12px 20px 0;padding:10px 16px;font-size:13px;display:flex}.error-banner .retry-btn{cursor:pointer;margin-left:auto;font-weight:500;text-decoration:underline}