.sidebar{background:var(--bg-secondary);-webkit-backdrop-filter:blur(20px);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;height:100dvh;display:flex}.sidebar-content{flex-direction:column;width:260px;height:100%;padding:8px 12px;display:flex}.sidebar.rail .sidebar-content{align-items:center;width:60px;padding:8px 6px}.sidebar-header{justify-content:space-between;align-items:center;gap:8px;padding:8px 4px 16px;display:flex}.sidebar-header-brand{align-items:center;gap:10px;min-width:0;display:flex}.sidebar-logo-mark{border-radius:8px;flex-shrink:0;width:96px}.sidebar-logo-img{-webkit-user-select:none;user-select:none;width:86px;height:38px}[data-theme=dark] .sidebar-logo-img{filter:brightness(0)invert()}.sidebar.rail .sidebar-header{justify-content:center;padding:8px 0 16px}.new-chat-action{border:1px solid var(--accent-border);background:var(--surface);width:100%;color:var(--text);cursor:pointer;font-size:13px;font-weight:600;font-family:var(--sans);border-radius:10px;justify-content:center;align-items:center;gap:8px;padding:9px 12px;transition:background-color .15s,border-color .15s;display:flex}.sidebar.rail .new-chat-action{width:36px;height:36px;padding:0}.new-chat-action:hover{background:var(--accent-bg);border-color:var(--focus-ring)}.new-chat-action svg{color:var(--primary);flex-shrink:0}.sidebar-search{background:var(--bg-tertiary);color:var(--text-muted);border:1px solid #0000;border-radius:10px;align-items:center;gap:8px;margin-top:8px;padding:7px 10px;transition:border-color .15s;display:flex}.sidebar-search:focus-within{border-color:var(--accent-border)}.sidebar-search input{min-width:0;color:var(--text);font-size:13px;font-family:var(--sans);background:0 0;border:none;outline:none;flex:1}.sidebar-search 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.12s;display:flex;position:relative}.history-item:hover{background:var(--surface-hover)}.history-item.active{background:var(--accent-bg)}.history-item.active:before{content:"";background:var(--primary);border-radius:2px;width:3px;position:absolute;top:6px;bottom:6px;left:0}.history-icon{color:var(--text-muted);flex-shrink:0}.history-item.active .history-icon{color:var(--accent)}.history-title{color:var(--text-secondary);white-space:nowrap;text-overflow:ellipsis;flex:1;min-width:0;font-size:13px;font-weight:400;overflow:hidden}.history-item.active .history-title,.history-item:hover .history-title{color:var(--text)}.history-actions{gap:2px;display:flex}.history-actions button{width:22px;height:22px;color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-radius:5px;justify-content:center;align-items:center;transition:background-color .12s,color .12s;display:flex}.history-actions button:hover{background:var(--bg-tertiary);color:var(--text)}.history-actions button.danger:hover{color:var(--danger)}.history-edit{flex:1}.history-edit input{background:var(--bg-tertiary);border:1px solid var(--accent-border);width:100%;color:var(--text);font-size:13px;font-family:var(--sans);border-radius:6px;outline:none;padding:4px 8px}.sidebar-account{border-top:1px solid var(--border);margin-top:auto;padding:8px 0 4px;position:relative}.account-trigger{cursor:pointer;text-align:left;width:100%;font-family:var(--sans);background:0 0;border:none;border-radius:10px;align-items:center;gap:10px;padding:8px 10px;transition:background-color .15s;display:flex}.sidebar.rail .account-trigger{justify-content:center;width:36px;height:36px;padding:0}.account-trigger:hover,.account-trigger.open{background:var(--surface-hover)}.account-menu{border:1px solid var(--border);background:var(--surface);z-index:20;border-radius:12px;flex-direction:column;gap:2px;width:220px;padding:6px;display:flex;position:absolute;bottom:calc(100% + 4px);left:0;box-shadow:0 12px 32px #0000002e}.account-menu button{width:100%;color:var(--text-secondary);cursor:pointer;text-align:left;font-size:13px;font-weight:600;font-family:var(--sans);background:0 0;border:none;border-radius:8px;align-items:center;gap:10px;padding:8px 10px;transition:background-color .15s,border-color .15s,color .15s;display:flex}.account-menu button:hover{background:var(--surface-hover);color:var(--text)}.account-menu button.accent{color:var(--accent)}.account-menu button.accent:hover{background:var(--accent-bg)}.account-menu button.danger:hover{color:var(--danger);background:var(--danger-bg)}.user-avatar-small{background:var(--accent);color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:12px;font-weight:600;display:flex}.user-avatar-small svg{color:#fff;width:14px;height:14px}.user-details{flex-direction:column;flex:1;min-width:0;display:flex}.user-name{color:var(--text);white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:600;overflow:hidden}.user-email{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;font-size:11px;overflow:hidden}.account-chevron{color:var(--text-muted);flex-shrink:0}.files-action{width:100%;color:var(--text-secondary);cursor:pointer;font-size:13px;font-weight:500;font-family:var(--sans);background:0 0;border:none;border-radius:8px;justify-content:center;align-items:center;gap:8px;margin-top:4px;padding:7px 10px;transition:background-color .15s,color .15s;display:flex}.sidebar.rail .files-action{width:36px;height:36px;padding:0}.files-action:hover{background:var(--surface-hover);color:var(--text)}.files-action svg{flex-shrink:0}.files-panel{border:1px solid var(--border);background:var(--surface);z-index:21;border-radius:12px;flex-direction:column;gap:2px;width:220px;max-height:320px;padding:8px;display:flex;position:absolute;bottom:calc(100% + 4px);left:0;overflow-y:auto;box-shadow:0 12px 32px #0000002e}.files-panel-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;padding:4px 6px 8px;font-size:11px;font-weight:600}.files-panel-empty{color:var(--text-muted);margin:0;padding:6px;font-size:12px}.file-row{color:var(--text-secondary);border-radius:8px;align-items:center;gap:8px;padding:7px 8px;font-size:12px;text-decoration:none;transition:background-color .12s,color .12s;display:flex}.file-row:hover{background:var(--surface-hover);color:var(--text)}.file-row svg{color:var(--primary);flex-shrink:0}.file-row-name{white-space:nowrap;text-overflow:ellipsis;flex:1;min-width:0;overflow:hidden}.sidebar-reopen{border:1px solid var(--border);background:var(--surface);width:32px;height:32px;color:var(--text-secondary);cursor:pointer;z-index:50;border-radius:8px;justify-content:center;align-items:center;transition:background-color .2s,border-color .2s,color .2s;display:flex;position:fixed;top:16px;left:12px;box-shadow:0 2px 8px #0000004d}.sidebar-reopen:hover{background:var(--surface-hover);color:var(--text)}.sidebar-backdrop{display:none}@media (width<=768px){.sidebar{z-index:101;position:fixed;inset:0 auto 0 0;box-shadow:4px 0 24px #00000040}.sidebar-content{padding-top:calc(8px + env(safe-area-inset-top));padding-bottom:calc(8px + env(safe-area-inset-bottom))}.sidebar-backdrop{z-index:100;background:#00000073;display:block;position:fixed;inset:0}.sidebar-reopen{top:calc(16px + env(safe-area-inset-top))}.history-actions{opacity:1}}.chat-area{background:var(--bg);flex-direction:column;flex:1;min-width:0;height:100dvh;display:flex;position:relative;overflow:hidden}.chat-topbar{background:var(--bg);z-index:10;flex-shrink:0;justify-content:space-between;align-items:center;min-height:48px;padding:12px 20px;display:flex;position:sticky;top:0}.topbar-spacer{flex:1}.topbar-action{width:28px;height:28px;color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-radius:6px;justify-content:center;align-items:center;transition:background-color .15s,border-color .15s,color .15s;display:flex}.topbar-action:hover{background:var(--surface-hover);color:var(--text)}.messages-scroller{flex:1;overflow:hidden auto}.messages-scroller::-webkit-scrollbar{width:4px}.messages-scroller::-webkit-scrollbar-track{background:0 0}.messages-scroller::-webkit-scrollbar-thumb{background:0 0;border-radius:10px}.messages-scroller:hover::-webkit-scrollbar-thumb{background:var(--border)}.welcome-screen{flex-direction:column;justify-content:center;align-items:center;min-height:100%;padding:40px 20px;display:flex}.welcome-content{flex-direction:column;align-items:center;gap:24px;width:100%;max-width:500px;display:flex}.welcome-logo-img{width:auto;height:44px}[data-theme=dark] .welcome-logo-img{filter:brightness(0)invert()}.welcome-label{color:var(--accent);text-transform:uppercase;letter-spacing:.6px;margin-top:-12px;font-size:12px;font-weight:600}.welcome-about{max-width:420px;color:var(--text-secondary);text-align:center;margin:0;font-size:14px;line-height:1.6}.messages-view{flex-direction:column;padding:8px 0 120px;display:flex}.msg-row{gap:12px;width:100%;max-width:768px;margin:0 auto;padding:24px 24px 24px 20px;display:flex;position:relative}.msg-row.user{padding:16px 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label{color:var(--text-secondary);font-size:13px;font-weight:600}.form-group input{border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:14px;font-family:var(--sans);border-radius:10px;outline:none;padding:10px 12px;transition:border-color .2s}.form-group input:focus{border-color:var(--accent-border)}.form-row{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:16px;padding:12px 0;display:flex}.form-row:last-child{border-bottom:none}.form-row label{color:var(--text);font-size:14px;font-weight:600}.form-row select{border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:13px;font-family:var(--sans);border-radius:8px;outline:none;min-width:160px;padding:8px 12px;transition:border-color .2s}.form-row select:focus{border-color:var(--accent-border)}.toggle-row{align-items:flex-start}.toggle-row .hint{color:var(--text-secondary);margin:4px 0 0;font-size:13px}.toggle{background:var(--border-hover);cursor:pointer;border:none;border-radius:12px;flex-shrink:0;width:44px;height:24px;padding:0;transition:background .2s;position:relative}.plans-grid{grid-template-columns:1fr 1fr;gap:16px;margin-top:8px;display:grid}.plan-card{border:1px solid var(--border);background:var(--surface);border-radius:16px;flex-direction:column;padding:24px;display:flex;position:relative}.plan-card.pro{border-color:var(--accent-border);background:var(--accent-bg)}.plan-badge{background:var(--surface-active);color:var(--text-secondary);text-transform:uppercase;letter-spacing:.3px;border-radius:0 0 8px 8px;padding:4px 10px;font-size:11px;font-weight:600;position:absolute;top:-1px;right:20px}.plan-header{margin-bottom:16px}.plan-header h4{color:var(--text);margin:0 0 8px;font-size:18px;font-weight:600}.plan-price{align-items:baseline;gap:4px;display:flex}.plan-price .price{color:var(--text);font-size:28px;font-weight:600}.plan-price 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var(--border);justify-content:flex-end;gap:10px;padding:16px 24px;display:flex}.btn-ghost{border:1px solid var(--border);color:var(--text);cursor:pointer;font-size:14px;font-weight:600;font-family:var(--sans);background:0 0;border-radius:10px;padding:10px 18px;transition:background-color .15s,border-color .15s,color .15s}.btn-ghost:hover{background:var(--surface-hover)}.btn-primary{background:var(--accent);color:#fff;cursor:pointer;font-size:14px;font-weight:600;font-family:var(--sans);border:none;border-radius:10px;align-items:center;gap:6px;padding:10px 18px;transition:background-color .15s,border-color .15s,color .15s;display:flex}@media (width<=640px){.settings-panel{border-radius:0;max-width:100%;height:100dvh;max-height:100dvh}.settings-panel-body{flex-direction:column}.settings-nav{border-right:none;border-bottom:1px solid var(--border);flex-direction:row;width:100%;padding:8px;overflow-x:auto}.settings-nav-item{white-space:nowrap;flex:1;justify-content:center;padding:8px 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.15s;display:flex}.auth-submit:hover{background:var(--accent-hover)}.auth-submit:disabled{opacity:.6;cursor:not-allowed}.spin{animation:1s linear infinite spin}.auth-footer{text-align:center;color:var(--text-muted);margin:20px 0 0;font-size:12px;line-height:1.5}@media (width<=480px){.auth-overlay{padding:16px}.auth-modal{padding:24px 20px}}.app{background:var(--bg);width:100%;height:100dvh;display:flex;overflow:hidden}.modal-overlay{-webkit-backdrop-filter:blur(12px);z-index:1000;background:#00000080;justify-content:center;align-items:center;animation:.2s fadeIn;display:flex;position:fixed;inset:0}.modal{background:var(--bg-secondary);border:1px solid var(--border);border-radius:16px;width:100%;max-width:440px;overflow:hidden;box-shadow:0 24px 80px #0009}.modal-header{justify-content:space-between;align-items:center;padding:20px 20px 0;display:flex}.modal-header 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input:focus{border-color:var(--accent-border)}.toggle{background:var(--border-hover);cursor:pointer;border:none;border-radius:11px;width:42px;height:22px;padding:0;transition:background .2s;position:relative}.toggle.on{background:var(--accent)}.toggle span{background:#fff;border-radius:50%;width:18px;height:18px;transition:transform .2s;position:absolute;top:2px;left:2px;box-shadow:0 1px 2px #0003}.toggle.on span{transform:translate(20px)}.modal-footer{justify-content:flex-end;gap:8px;padding:0 20px 20px;display:flex}.btn-secondary{border:1px solid var(--border);color:var(--text);cursor:pointer;font-size:13px;font-weight:600;font-family:var(--sans);background:0 0;border-radius:8px;padding:8px 16px;transition:background-color .15s,border-color .15s,color .15s}.btn-secondary:hover{background:var(--surface-hover)}.btn-primary{background:var(--accent);color:#fff;cursor:pointer;font-size:13px;font-weight:600;font-family:var(--sans);border:none;border-radius:8px;padding:8px 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.15s}.btn-primary:hover{background:var(--accent-hover)}*{box-sizing:border-box;margin:0;padding:0}:root{--brand-900:#0b1930;--brand-700:#142a4a;--brand-500:#2a4a78;--brand-100:#dce3ee;--brand-50:#eef1f6;--gray-900:#111827;--gray-600:#4b5563;--gray-400:#9ca3af;--gray-200:#e5e7eb;--gray-50:#f9fafb;--white:#fff;--danger-600:#dc2626;--danger-50:#fef2f2;--bg:var(--gray-50);--bg-secondary:var(--white);--bg-tertiary:#f3f4f6;--surface:var(--white);--surface-hover:var(--gray-50);--surface-active:var(--brand-100);--border:var(--gray-200);--border-hover:#d1d5db;--text:var(--gray-900);--text-secondary:var(--gray-600);--text-muted:var(--gray-400);--primary:var(--brand-700);--primary-hover:var(--brand-900);--accent:var(--brand-700);--accent-hover:var(--brand-900);--accent-bg:var(--brand-50);--accent-border:var(--brand-100);--focus-ring:var(--brand-500);--danger:var(--danger-600);--danger-hover:#b91c1c;--danger-bg:var(--danger-50);--sans:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, 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var(--focus-ring);outline-offset:2px}body{background:var(--bg);color:var(--text);width:100%;height:100dvh;overflow:hidden}html{font-family:var(--sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizelegibility;font-size:15px;line-height:1.5}::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border);border-radius:10px}::-webkit-scrollbar-thumb:hover{background:var(--border-hover)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes pulse{0%,to{opacity:.4}50%{opacity:1}}