:root{--bg-primary:#f5f5f7;--bg-secondary:#fff;--bg-tertiary:#e8e8ed;--text-primary:#1d1d1f;--text-secondary:#6e6e73;--text-muted:#86868b;--border-color:#0000000f;--accent:#5e6ad2;--accent-hover:#6e7ae0;--accent-soft:#5e6ad21f;--danger:#ff3b30;--success:#34c759;--warning:#ff9500;--info:#5ac8fa;--glass-bg:#ffffff73;--glass-bg-heavy:#ffffffe6;--glass-bg-subtle:#ffffff40;--glass-bg-solid:#fffc;--glass-border:#6161611a;--glass-border-strong:#616161b3;--glass-highlight:#fff9;--glass-shadow:0 8px 32px #00000014;--glass-shadow-lg:0 16px 48px #0000001f;--glass-shadow-inset:inset 0 1px 0 #fff9;--blur-sm:blur(8px);--blur-md:blur(16px);--blur-lg:blur(24px);--blur-xl:blur(32px);--blur-2xl:blur(40px);--font-sans:-apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--radius-sm:10px;--radius-md:14px;--radius-lg:20px;--radius-xl:24px;--radius-full:9999px;--shadow-sm:0 1px 3px #0000000a;--shadow:0 2px 8px #0000000f;--shadow-md:0 4px 16px #00000014;--shadow-lg:0 8px 32px #0000001a;--shadow-xl:0 16px 48px #0000001f;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px;--space-8:32px;--space-10:40px;--space-12:48px;--space-16:64px;--space-20:80px;--transition:.25s cubic-bezier(.4, 0, .2, 1);--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-spring:.35s cubic-bezier(.34, 1.56, .64, 1)}[data-theme=dark]{--bg-primary:#000;--bg-secondary:#0a0a0a;--bg-tertiary:#141416;--text-primary:#f5f5f7;--text-secondary:#a1a1a6;--text-muted:#6e6e73;--border-color:#ffffff14;--accent:#5e6ad2;--accent-hover:#6e7ae0;--accent-soft:#5e6ad226;--danger:#ff453a;--success:#30d158;--warning:#ff9f0a;--info:#64d2ff;--glass-bg:#1c1c1e73;--glass-bg-heavy:#1c1c1ee6;--glass-bg-subtle:#1c1c1e40;--glass-bg-solid:#1c1c1ecc;--glass-border:#ffffff1a;--glass-border-strong:#ffffff26;--glass-highlight:#ffffff14;--glass-shadow:0 8px 32px #0000004d;--glass-shadow-lg:0 16px 48px #0006;--glass-shadow-inset:inset 0 1px 0 #ffffff0f}*{box-sizing:border-box;margin:0;padding:0}.btn{justify-content:center;align-items:center;gap:var(--space-2);font-size:14px;font-weight:500;font-family:var(--font-sans);color:var(--text-primary);background:var(--glass-bg-subtle);border:1px solid var(--glass-border);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;-webkit-tap-highlight-color:transparent;padding:10px 20px;text-decoration:none;display:inline-flex}.btn:hover:not(:disabled){transform:translateY(-1px)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{color:#fff;background:var(--accent)}.btn-primary:hover:not(:disabled){background:var(--accent-hover);box-shadow:0 4px 16px #5e6ad24d}.btn-secondary{color:var(--text-primary);background:var(--glass-bg-subtle);-webkit-backdrop-filter:var(--blur-sm);border:1px solid var(--glass-border)}.btn-secondary:hover:not(:disabled){border-color:var(--accent);color:var(--accent);background:var(--accent-soft);transform:translateY(-1px)}.btn-danger{color:#fff;background:var(--danger)}.btn-danger:hover:not(:disabled){box-shadow:0 4px 16px #ff3b304d}.btn-ghost{color:var(--text-secondary);border:1px solid var(--glass-border);background:0 0}.btn-ghost:hover:not(:disabled){background:var(--glass-bg-subtle);color:var(--text-primary);border-color:var(--glass-border-strong)}.btn-info{color:#fff;background:var(--info)}.btn-info:hover:not(:disabled){box-shadow:0 4px 16px #5ac8fa4d}.btn-warning{color:#fff;background:var(--warning)}.btn-warning:hover:not(:disabled){box-shadow:0 4px 16px #ff95004d}.btn-icon{border-radius:var(--radius-md);background:var(--glass-bg-subtle);border:1px solid var(--glass-border);width:32px;height:32px;color:var(--text-secondary);padding:0}.btn-icon:hover:not(:disabled){background:var(--glass-bg);color:var(--text-primary);border-color:var(--glass-border-strong)}.btn-circle{border-radius:50%;width:44px;height:44px;padding:0}.btn-full{width:100%}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh;overflow-x:hidden}body:before{content:"";z-index:-1;pointer-events:none;background:radial-gradient(80% 60% at 20% 10%,#5e6ad214 0%,#0000 60%),radial-gradient(60% 80% at 80% 90%,#5ac8fa0f 0%,#0000 60%),radial-gradient(50% 50%,#34c7590a 0%,#0000 60%);position:fixed;inset:0}[data-theme=dark] body:before{background:radial-gradient(80% 60% at 20% 10%,#5e6ad21f 0%,#0000 60%),radial-gradient(60% 80% at 80% 90%,#5ac8fa14 0%,#0000 60%),radial-gradient(50% 50%,#34c7590d 0%,#0000 60%)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:var(--radius-full);opacity:.5}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}a{color:var(--accent);transition:color var(--transition-fast);text-decoration:none}button{font-family:var(--font-sans);cursor:pointer;color:inherit;-webkit-tap-highlight-color:transparent}::selection{background:var(--accent);color:#fff}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:var(--radius-sm)}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes slideInRight{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes spin{to{transform:rotate(360deg)}}.input{width:100%;font-size:14px;font-family:var(--font-sans);color:var(--text-primary);background:var(--glass-bg-subtle);border:1px solid var(--glass-border);border-radius:var(--radius-md);transition:all var(--transition-fast);-webkit-tap-highlight-color:transparent;outline:none;padding:10px 14px}.input::placeholder{color:var(--text-muted)}.input:focus{border-color:var(--accent);background:var(--glass-bg);box-shadow:0 0 0 3px var(--accent-soft)}.input-pill{border-radius:var(--radius-full);padding:12px 18px}.input-compact{padding:10px 12px;font-size:13px}.input-flex{flex:1}.backend-error-page{min-height:60vh;padding:var(--space-8);justify-content:center;align-items:center;display:flex}.backend-error-card{background:var(--glass-bg);-webkit-backdrop-filter:var(--blur-lg);backdrop-filter:var(--blur-lg);border:1px solid var(--glass-border);border-radius:var(--radius-xl);padding:var(--space-12);text-align:center;width:100%;max-width:480px;box-shadow:var(--glass-shadow-lg);animation:.3s ease-out scaleIn}.backend-error-icon{margin-bottom:var(--space-4);font-size:48px}.backend-error-card h2{margin-bottom:var(--space-3);font-size:24px;font-weight:600}.backend-error-url{margin-bottom:var(--space-2)}.backend-error-url code{background:var(--glass-bg-solid);border-radius:var(--radius-sm);font-family:var(--font-mono);word-break:break-all;padding:4px 10px;font-size:14px}.backend-error-desc{color:var(--text-secondary);margin-bottom:var(--space-6);font-size:14px}.backend-error-form{gap:var(--space-3);margin-bottom:var(--space-4);display:flex}.not-found-page{min-height:100dvh;padding:var(--space-8);justify-content:center;align-items:center;display:flex}.not-found-card{background:var(--glass-bg);-webkit-backdrop-filter:var(--blur-lg);border:1px solid var(--glass-border);border-radius:var(--radius-xl);padding:var(--space-12) var(--space-10);text-align:center;width:100%;max-width:420px;box-shadow:var(--glass-shadow-lg);animation:.35s cubic-bezier(.34,1.56,.64,1) both scaleIn}.not-found-icon{border-radius:var(--radius-full);background:var(--accent-soft);width:88px;height:88px;color:var(--accent);margin-bottom:var(--space-6);justify-content:center;align-items:center;display:inline-flex}.not-found-title{margin-bottom:var(--space-3);color:var(--text-primary);font-size:22px;font-weight:600}.not-found-desc{color:var(--text-secondary);margin-bottom:var(--space-8);font-size:15px;line-height:1.6}.not-found-actions{justify-content:center;align-items:center;gap:var(--space-3);display:flex}@media (max-width:480px){.not-found-card{padding:var(--space-8) var(--space-5)}.not-found-actions{flex-direction:column;width:100%}.not-found-actions .btn{width:100%}}
.app-layout{height:100vh;color:var(--text-primary);background:0 0;display:flex;overflow:hidden}.backend-warning-bar{background:var(--warning);color:#fff;border-radius:var(--radius-sm);box-sizing:border-box;justify-content:space-between;align-items:center;gap:12px;width:100%;padding:8px 16px;font-size:13px;font-weight:500;display:flex}.backend-warning-bar button{color:#fff;cursor:pointer;background:0 0;border:none;flex-shrink:0;padding:0 4px;font-size:18px;line-height:1}.sidebar{background:var(--glass-bg-heavy);width:200px;height:100vh;-webkit-backdrop-filter:var(--blur-xl);border-right:1px solid var(--glass-border);box-shadow:var(--glass-shadow-inset);transition:width var(--transition), transform var(--transition);flex-direction:column;flex-shrink:0;display:flex;overflow-y:auto}.sidebar.collapsed{border:none;width:0;overflow:hidden}.sidebar .sidebar-header{border-bottom:1px solid var(--glass-border);align-items:center;min-height:64px;padding:14px 16px;display:flex}.sidebar .sidebar-header h1{background:linear-gradient(135deg, var(--accent), var(--info));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:18px;font-weight:700}.sidebar .sidebar-nav{flex:1;padding:12px 8px}.sidebar .sidebar-nav-btn{border-radius:var(--radius-md);cursor:pointer;width:100%;color:var(--text-secondary);transition:all var(--transition-fast);background:0 0;border:none;align-items:center;gap:10px;margin-bottom:4px;padding:10px 12px;font-size:13px;font-weight:500;display:flex}.sidebar .sidebar-nav-btn.active{background:var(--accent-soft);color:var(--accent);box-shadow:var(--glass-shadow-inset);font-weight:600}.sidebar .sidebar-nav-btn:hover:not(.active){background:var(--glass-bg-subtle);color:var(--text-primary)}.sidebar .sidebar-footer{border-top:1px solid var(--glass-border);padding:12px 16px}.sidebar .sidebar-footer-label{color:var(--text-secondary);align-items:center;gap:6px;margin-bottom:6px;font-size:11px;display:flex}.sidebar .storage-bar{border-radius:var(--radius-full);background:var(--glass-bg-subtle);height:4px;overflow:hidden}.sidebar .storage-bar-fill{background:linear-gradient(90deg, var(--accent), var(--info));border-radius:var(--radius-full);height:100%;transition:width .3s}.sidebar .storage-info{color:var(--text-secondary);justify-content:space-between;margin-top:4px;font-size:10px;display:flex}.sidebar .chat-sidebar-footer{border-top:1px solid var(--glass-border);justify-content:space-between;align-items:center;gap:8px;padding:12px 16px;display:flex}.sidebar .user-info{flex:1;align-items:center;gap:8px;min-width:0;display:flex}.sidebar .user-avatar{border-radius:var(--radius-sm);background:var(--glass-bg-subtle);width:24px;height:24px;color:var(--text-secondary);flex-shrink:0;justify-content:center;align-items:center;display:flex}.sidebar .user-name{color:var(--text-primary);text-overflow:ellipsis;white-space:nowrap;font-size:12px;overflow:hidden}.sidebar .login-btn{border-radius:var(--radius-sm);background:var(--accent);color:#fff;cursor:pointer;transition:all var(--transition-fast);border:none;flex-shrink:0;padding:4px 10px;font-size:11px;font-weight:500}.sidebar .login-btn:hover{opacity:.85;transform:scale(1.02)}.sidebar .logout-btn{border-radius:var(--radius-sm);border:1px solid var(--glass-border);color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast);background:0 0;flex-shrink:0;padding:4px 10px;font-size:11px;font-weight:500}.sidebar .logout-btn:hover{background:var(--glass-bg-subtle);color:var(--text-primary)}.sidebar .sidebar-tools{border-top:1px solid var(--glass-border);padding:12px 8px}.sidebar .sidebar-tools-label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;align-items:center;gap:6px;margin-bottom:6px;padding-left:12px;font-size:11px;font-weight:500;display:flex}.sidebar-overlay{display:none}.sidebar-toggle-btn{display:flex}.mobile-menu-btn{display:none}.main-content{flex-direction:column;flex:1;min-width:0;display:flex;overflow:hidden}.app-header{border-bottom:1px solid var(--glass-border);background:var(--glass-bg);min-height:64px;-webkit-backdrop-filter:var(--blur-lg);box-sizing:border-box;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:14px 24px;display:flex}.app-header .header-left{align-items:center;gap:12px;display:flex}.app-header .header-title{font-size:16px;font-weight:600}.app-header .header-badge{border-radius:var(--radius-full);background:var(--glass-bg-subtle);border:1px solid var(--glass-border);color:var(--text-secondary);align-items:center;gap:4px;padding:3px 8px;font-size:11px;display:flex}.app-header .header-badge-dot{background:var(--warning);border-radius:50%;width:6px;height:6px}.app-header .header-badge-dot.connected{background:var(--success)}.app-header .header-right{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.search-box{border-radius:var(--radius-md);background:var(--glass-bg-subtle);border:1px solid var(--glass-border);align-items:center;gap:8px;padding:6px 12px;display:flex}.search-box input{color:var(--text-primary);background:0 0;border:none;outline:none;width:100%;padding-left:2px;font-size:12px}.search-box button{cursor:pointer;color:var(--text-secondary);background:0 0;border:none;padding:0;display:flex}.action-grid{grid-template-columns:1fr 1fr;gap:12px;padding:16px 24px;display:grid;position:relative}.action-card{border:1.5px dashed var(--glass-border-strong);border-radius:var(--radius-lg);text-align:center;cursor:pointer;background:var(--glass-bg-subtle);-webkit-backdrop-filter:var(--blur-sm);transition:all var(--transition);padding:20px;position:relative}.action-card:hover{background:var(--glass-bg);border-color:var(--accent);box-shadow:var(--glass-shadow)}.action-card p{color:var(--accent);font-size:12px;font-weight:500}.action-card.upload.drag-over{border-color:var(--accent);background:var(--accent-soft)}.action-card-download p{color:var(--info)}.action-card-input{opacity:0;cursor:pointer;z-index:1;width:100%;height:100%;position:absolute;inset:0}.breadcrumb{align-items:center;gap:4px;padding:0 24px;font-size:12px;display:flex}.breadcrumb button{color:var(--text-muted);cursor:pointer;border-radius:var(--radius-sm);transition:all var(--transition-fast);background:0 0;border:none;padding:2px 4px}.breadcrumb button:hover{color:var(--text-primary);background:var(--glass-bg-subtle)}.breadcrumb button.current{color:var(--text-secondary);font-weight:500}.breadcrumb .breadcrumb-edit-btn{cursor:pointer;color:var(--text-secondary);background:0 0;border:none;align-items:center;padding:2px;display:flex}.content-grid{flex:1;padding:12px 24px;overflow:auto}.file-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:16px;display:grid}.empty-state{text-align:center;color:var(--text-muted);padding:48px;font-size:13px}.empty-state.glass{justify-content:center;align-items:center;gap:var(--space-4);padding:var(--space-12) var(--space-6);background:var(--glass-bg-subtle);border:1px dashed var(--glass-border);border-radius:var(--radius-lg);-webkit-backdrop-filter:var(--blur-sm);backdrop-filter:var(--blur-sm);flex-direction:column;display:flex}.empty-state.glass p{max-width:320px;font-size:14px;line-height:1.6}.empty-state-icon{border-radius:var(--radius-full);background:var(--glass-bg);width:64px;height:64px;color:var(--text-muted);justify-content:center;align-items:center;display:flex}.card{border-radius:var(--radius-lg);cursor:pointer;background:var(--glass-bg-subtle);-webkit-backdrop-filter:var(--blur-md);border:1px solid var(--glass-border);transition:all var(--transition);box-shadow:var(--glass-shadow-inset);flex-direction:column;align-items:center;padding:16px;display:flex}.card:hover{border-color:var(--glass-border-strong);background:var(--glass-bg);box-shadow:var(--glass-shadow);transform:translateY(-2px)}.card.selected{background:var(--accent-soft);border-color:var(--accent);box-shadow:0 0 0 1px var(--accent), var(--glass-shadow)}.card-icon{border-radius:var(--radius-md);width:56px;height:56px;box-shadow:var(--shadow-sm);justify-content:center;align-items:center;margin-bottom:10px;display:flex}.card-icon.folder{background:linear-gradient(135deg,#818cf8,#6366f1)}.card-icon.file{background:linear-gradient(135deg,#a78bfa,#8b5cf6)}.card-icon.starred{background:linear-gradient(135deg,#fbbf24,#f59e0b)}.card-icon.trash{background:linear-gradient(135deg,#94a3b8,#64748b)}.card-name{text-align:center;text-overflow:ellipsis;white-space:nowrap;max-width:100%;color:var(--text-primary);font-size:12px;font-weight:500;overflow:hidden}.card-date{color:var(--text-muted);margin-top:2px;font-size:10px}.modal-overlay{z-index:200;justify-content:center;align-items:center;animation:.2s fadeIn;display:flex;position:fixed;inset:0}.modal-overlay-backdrop{z-index:0;-webkit-backdrop-filter:var(--blur-xl);pointer-events:none;background:#0000004d;position:absolute;inset:0}.modal-glass{z-index:1;border-radius:var(--radius-lg);background:var(--glass-bg-heavy);width:380px;max-width:calc(100vw - 32px);-webkit-backdrop-filter:var(--blur-2xl);border:1px solid var(--glass-border);box-shadow:var(--glass-shadow-lg), var(--glass-shadow-inset);padding:24px;animation:.25s scaleIn;position:relative}.modal-header{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}.modal-header h3{font-size:16px;font-weight:600}.modal-header button{cursor:pointer;color:var(--text-muted);background:0 0;border:none}.welcome-modal{text-align:center}.welcome-modal h2{margin-bottom:12px;font-size:18px;font-weight:600}.welcome-modal p{color:var(--text-secondary);margin-bottom:20px;font-size:13px;line-height:1.6}.welcome-steps{justify-content:center;gap:6px;margin-bottom:20px;display:flex}.welcome-step-dot{background:var(--glass-bg-subtle);border:1px solid var(--glass-border);border-radius:50%;width:6px;height:6px}.welcome-step-dot.active{background:var(--accent);border-color:var(--accent)}.welcome-actions{justify-content:center;gap:10px;display:flex}.welcome-success-icon{background:#34c75926;border:1px solid #34c7594d;border-radius:50%;justify-content:center;align-items:center;width:48px;height:48px;margin:0 auto 16px;display:flex}.spinner{border:2px solid;border-top-color:#0000;border-radius:50%;width:16px;height:16px;animation:.6s linear infinite spin;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.settings-modal .settings-title{color:var(--text-primary);font-size:18px;font-weight:600}.settings-modal .settings-label{color:var(--text-primary);margin-bottom:8px;font-size:13px;font-weight:500;display:block}.settings-modal .settings-row{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.settings-modal .settings-hint{color:var(--text-muted);margin-top:8px;font-size:11px}.settings-modal .settings-divider{border-top:1px solid var(--glass-border);padding-top:16px}.settings-modal .settings-about{text-align:center;margin-bottom:16px}.settings-modal .settings-about h3{color:var(--text-primary);margin-bottom:4px;font-size:16px;font-weight:600}.settings-modal .settings-about p{color:var(--text-muted);font-size:12px}.network-addresses{flex-direction:column;gap:8px;margin-top:8px;display:flex}.address-item{background:var(--glass-bg-subtle);border-radius:var(--radius-md);border:1px solid var(--glass-border);align-items:center;gap:8px;padding:8px 12px;font-size:13px;display:flex}.address-type{border-radius:var(--radius-sm);white-space:nowrap;padding:2px 8px;font-size:11px;font-weight:600;display:inline-block}.address-type-local{color:var(--text-secondary);background:#64748b26}.address-type-lan{background:var(--accent-soft);color:var(--accent)}.address-type-tailscale{color:var(--success);background:#34c7591f}.address-type-zerotier{color:var(--info);background:#5ac8fa1f}.address-url{color:var(--text-primary);text-overflow:ellipsis;white-space:nowrap;flex:1;font-size:12px;overflow:hidden}.page-header{align-items:center;gap:var(--space-3);margin-bottom:var(--space-6);display:flex}.page-title{font-size:20px;font-weight:600}.qr-wrap{padding:var(--space-4);border-radius:var(--radius-lg);width:fit-content;margin:0 auto var(--space-3);background:#fff;justify-content:center;display:flex}.page-footer{align-items:center;gap:var(--space-3);margin-top:var(--space-4);flex-direction:column;display:flex}.input-panel{background:var(--glass-bg);-webkit-backdrop-filter:var(--blur-md);backdrop-filter:var(--blur-md);border:1px solid 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