:root{--clr-bg: #f0f2f5;--clr-surface: #ffffff;--clr-border: #e2e8f0;--clr-primary: #0057ff;--clr-primary-h: #003fcb;--clr-text: #1a202c;--clr-muted: #718096;--clr-danger: #e53e3e;--clr-danger-h: #c53030;--clr-success: #38a169;--clr-warn: #d69e2e;--sidebar-w: 220px;--radius: 10px;--shadow-sm: 0 1px 3px rgba(0,0,0,.08);--shadow: 0 4px 12px rgba(0,0,0,.1);--transition: .15s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:14px;color:var(--clr-text);background:var(--clr-bg);line-height:1.5}button,input{font:inherit}.auth-shell{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.auth-card{width:100%;max-width:420px;background:var(--clr-surface);border:1px solid var(--clr-border);border-radius:18px;box-shadow:var(--shadow);padding:28px;display:flex;flex-direction:column;gap:18px}.auth-brand{padding:0}.auth-copy{color:var(--clr-muted)}.auth-tabs{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;background:#f8faff;padding:6px;border-radius:12px}.auth-tab{border:none;background:transparent;color:var(--clr-muted);padding:10px 12px;border-radius:8px;cursor:pointer;font-weight:600;transition:background var(--transition),color var(--transition),box-shadow var(--transition)}.auth-tab.active{background:var(--clr-surface);color:var(--clr-primary);box-shadow:var(--shadow-sm)}.auth-form{display:flex;flex-direction:column;gap:12px}.auth-label{font-size:13px;font-weight:600}.auth-input{border:1px solid var(--clr-border);border-radius:10px;padding:10px 12px;outline:none;transition:border-color var(--transition),box-shadow var(--transition)}.auth-input:focus{border-color:var(--clr-primary);box-shadow:0 0 0 3px #0057ff1f}.auth-submit{margin-top:8px;border:none;border-radius:10px;background:var(--clr-primary);color:#fff;padding:11px 14px;font-weight:600;cursor:pointer;transition:background var(--transition)}.auth-submit:hover{background:var(--clr-primary-h)}.layout{display:flex;height:100vh;overflow:hidden}.sidebar{width:var(--sidebar-w);min-width:var(--sidebar-w);background:var(--clr-surface);border-right:1px solid var(--clr-border);display:flex;flex-direction:column;padding:20px 0 16px;overflow-y:auto}.brand{display:flex;align-items:center;gap:10px;padding:0 20px 24px;font-size:18px;font-weight:700;color:var(--clr-primary)}.brand-icon{width:26px;height:26px;flex-shrink:0}.sidebar-nav{flex:1;padding:0 10px;overflow-y:auto}.nav-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:8px;color:var(--clr-muted);text-decoration:none;font-weight:500;transition:background var(--transition),color var(--transition);width:100%;border:none;background:none;cursor:pointer;text-align:left;font-size:14px}.nav-item svg{width:18px;height:18px;flex-shrink:0}.nav-item:hover{background:var(--clr-bg);color:var(--clr-text)}.nav-item.active{background:#eef2ff;color:var(--clr-primary)}.nav-section-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--clr-muted);padding:12px 12px 4px}.nav-folder{padding-left:20px;font-size:13px}.nav-folder svg{width:15px;height:15px}.storage-info{padding:16px 20px;border-top:1px solid var(--clr-border)}.storage-label{display:flex;justify-content:space-between;font-size:12px;color:var(--clr-muted);margin-bottom:6px}.storage-bar{height:6px;background:var(--clr-border);border-radius:99px;overflow:hidden}.storage-fill{height:100%;background:var(--clr-primary);border-radius:99px;transition:width .4s ease}.main{flex:1;display:flex;flex-direction:column;overflow:hidden}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 28px;background:var(--clr-surface);border-bottom:1px solid var(--clr-border);gap:16px;flex-shrink:0;min-height:57px}.topbar-right{display:flex;align-items:center;gap:12px}.breadcrumb{display:flex;align-items:center;gap:4px;flex-wrap:wrap;min-width:0}.bc-item{font-size:16px;font-weight:600;white-space:nowrap}.bc-link{background:none;border:none;cursor:pointer;color:var(--clr-primary);font-weight:600;font-size:16px;padding:0;text-decoration:none;transition:opacity var(--transition)}.bc-link:hover{opacity:.75}.bc-active{color:var(--clr-text)}.bc-sep{color:var(--clr-muted);font-size:16px;font-weight:400;margin:0 2px;-webkit-user-select:none;user-select:none}.search-wrap{position:relative;display:flex;align-items:center}.search-icon{position:absolute;left:10px;width:16px;height:16px;color:var(--clr-muted);pointer-events:none}.search-input{padding:8px 12px 8px 34px;border:1px solid var(--clr-border);border-radius:8px;font-size:14px;width:240px;background:var(--clr-bg);color:var(--clr-text);outline:none;transition:border-color var(--transition),box-shadow var(--transition)}.search-input:focus{border-color:var(--clr-primary);box-shadow:0 0 0 3px #0057ff1f}.account-chip{display:flex;align-items:center;gap:12px;padding:6px 10px 6px 12px;border:1px solid var(--clr-border);border-radius:999px;background:var(--clr-bg)}.account-copy{display:flex;flex-direction:column;min-width:0}.account-name{font-weight:600}.account-email{max-width:180px;color:var(--clr-muted);font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.btn-account-logout{border:none;border-radius:999px;background:var(--clr-primary);color:#fff;padding:7px 12px;cursor:pointer;font-weight:600;transition:background var(--transition)}.btn-account-logout:hover{background:var(--clr-primary-h)}.upload-section{padding:24px 28px 0;flex-shrink:0}.drop-zone{border:2px dashed var(--clr-border);border-radius:var(--radius);padding:32px 24px;text-align:center;cursor:pointer;transition:border-color var(--transition),background var(--transition);background:var(--clr-surface)}.drop-zone:hover,.drop-zone:focus{border-color:var(--clr-primary);background:#f5f8ff;outline:none}.drop-zone.drag-over{border-color:var(--clr-primary);background:#eef2ff}.drop-icon{width:44px;height:44px;color:var(--clr-primary);margin:0 auto 12px}.drop-title{font-size:15px;font-weight:600;margin-bottom:4px}.drop-link{color:var(--clr-primary);text-decoration:underline;cursor:pointer}.drop-hint{font-size:12px;color:var(--clr-muted);margin-top:4px}.progress-wrap{margin-top:12px;background:var(--clr-surface);border:1px solid var(--clr-border);border-radius:var(--radius);padding:14px 16px}.progress-info{display:flex;justify-content:space-between;font-size:13px;margin-bottom:8px;color:var(--clr-muted)}.progress-bar{height:8px;background:var(--clr-border);border-radius:99px;overflow:hidden}.progress-fill{height:100%;background:var(--clr-primary);border-radius:99px;width:0%;transition:width .2s ease}.files-section{flex:1;overflow-y:auto;padding:16px 28px 28px;display:flex;flex-direction:column;gap:12px}.files-header{display:flex;align-items:center;justify-content:space-between;flex-shrink:0}.files-count{font-size:13px;color:var(--clr-muted);font-weight:500}.files-header-right{display:flex;align-items:center;gap:8px}.btn-new-folder{background:var(--clr-primary);color:#fff;border:none;border-radius:8px;padding:7px 13px;font-size:13px;font-weight:500;cursor:pointer;display:flex;align-items:center;gap:5px;transition:background var(--transition);white-space:nowrap}.btn-new-folder:hover{background:var(--clr-primary-h)}.btn-new-folder svg{width:14px;height:14px}.view-btn{background:none;border:1px solid var(--clr-border);border-radius:6px;padding:5px 8px;cursor:pointer;color:var(--clr-muted);display:flex;align-items:center;transition:background var(--transition),color var(--transition)}.view-btn svg{width:16px;height:16px}.view-btn:hover{background:var(--clr-bg);color:var(--clr-text)}.view-btn.active{background:var(--clr-primary);border-color:var(--clr-primary);color:#fff}.file-list{background:var(--clr-surface);border:1px solid var(--clr-border);border-radius:var(--radius);overflow:hidden}.file-list-header{display:grid;grid-template-columns:40px 1fr 90px 140px 100px;padding:10px 16px;font-size:12px;font-weight:600;color:var(--clr-muted);text-transform:uppercase;letter-spacing:.04em;border-bottom:1px solid var(--clr-border);background:#fafbfc}.file-row{display:grid;grid-template-columns:40px 1fr 90px 140px 100px;align-items:center;padding:10px 16px;border-bottom:1px solid var(--clr-border);transition:background var(--transition)}.file-row:last-child{border-bottom:none}.file-row:hover{background:#f8faff}.col-icon{display:flex;align-items:center}.file-icon{width:28px;height:28px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}.col-name{font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding-right:16px}.col-size,.col-date{color:var(--clr-muted);font-size:13px}.col-actions{display:flex;gap:6px;align-items:center}.btn-action{background:none;border:1px solid var(--clr-border);border-radius:6px;padding:5px 8px;cursor:pointer;font-size:12px;font-weight:500;display:inline-flex;align-items:center;gap:4px;transition:background var(--transition),color var(--transition),border-color var(--transition);color:var(--clr-muted);text-decoration:none}.btn-action svg{width:13px;height:13px}.btn-download:hover{background:#eef2ff;border-color:var(--clr-primary);color:var(--clr-primary)}.btn-delete:hover{background:#fff5f5;border-color:var(--clr-danger);color:var(--clr-danger)}.file-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:14px}.grid-card{background:var(--clr-surface);border:1px solid var(--clr-border);border-radius:var(--radius);padding:16px 12px 12px;display:flex;flex-direction:column;align-items:center;gap:10px;cursor:default;transition:box-shadow var(--transition),border-color var(--transition)}.grid-card:hover{box-shadow:var(--shadow);border-color:var(--clr-primary)}.grid-icon{font-size:36px;line-height:1}.grid-name{font-size:13px;font-weight:500;text-align:center;word-break:break-word;width:100%;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.grid-meta{font-size:11px;color:var(--clr-muted);text-align:center}.grid-actions{display:flex;gap:6px;width:100%;justify-content:center}.folder-row{cursor:pointer}.folder-row:hover{background:#fffde7}.folder-row .col-name{color:var(--clr-text)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;display:flex;align-items:center;justify-content:center;z-index:500;padding:16px}.modal{background:var(--clr-surface);border-radius:var(--radius);padding:24px;width:100%;max-width:380px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:16px}.modal-title{font-size:17px;font-weight:700}.modal-input{border:1px solid var(--clr-border);border-radius:8px;padding:9px 12px;font-size:14px;width:100%;outline:none;transition:border-color var(--transition),box-shadow var(--transition);color:var(--clr-text)}.modal-input:focus{border-color:var(--clr-primary);box-shadow:0 0 0 3px #0057ff1f}.modal-actions{display:flex;justify-content:flex-end;gap:8px}.btn-modal-cancel{background:none;border:1px solid var(--clr-border);border-radius:7px;padding:8px 16px;font-size:13px;font-weight:500;cursor:pointer;color:var(--clr-muted);transition:background var(--transition)}.btn-modal-cancel:hover{background:var(--clr-bg)}.btn-modal-create{background:var(--clr-primary);border:none;border-radius:7px;padding:8px 18px;font-size:13px;font-weight:500;cursor:pointer;color:#fff;transition:background var(--transition)}.btn-modal-create:hover{background:var(--clr-primary-h)}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:64px 24px;color:var(--clr-muted);text-align:center}.empty-state svg{width:56px;height:56px;opacity:.4}.empty-state p{font-size:16px;font-weight:600}.empty-sub{font-size:13px;font-weight:400!important}#toastContainer{position:fixed;bottom:24px;right:24px;display:flex;flex-direction:column;gap:8px;z-index:1000;pointer-events:none}.toast{background:var(--clr-text);color:#fff;padding:12px 18px;border-radius:8px;font-size:14px;max-width:320px;box-shadow:var(--shadow);opacity:0;transform:translateY(10px);transition:opacity .25s ease,transform .25s ease;pointer-events:auto}.toast.visible{opacity:1;transform:translateY(0)}.toast.success{background:var(--clr-success)}.toast.error{background:var(--clr-danger)}.toast.info{background:var(--clr-primary)}.hidden{display:none!important}@media (max-width: 860px){.topbar{align-items:flex-start;flex-direction:column}.topbar-right{width:100%;flex-wrap:wrap}.account-chip{width:100%;justify-content:space-between;border-radius:14px}.account-email{max-width:none}}@media (max-width: 680px){.auth-shell{padding:16px}.auth-card{padding:22px}.sidebar{display:none}.topbar{padding:12px 16px}.upload-section,.files-section{padding-left:16px;padding-right:16px}.search-wrap,.search-input{width:100%}.files-header{align-items:flex-start;gap:10px;flex-direction:column}.files-header-right{width:100%;justify-content:space-between}.btn-new-folder span{display:none}.file-list-header,.file-row{grid-template-columns:36px 1fr 80px 90px}.col-date{display:none}}.toast-container{position:fixed;bottom:24px;right:24px;display:flex;flex-direction:column;gap:8px;z-index:1000;pointer-events:none}