*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--bg);color:var(--text-primary)}:root{--brand: #d97757;--brand-dark: #b85e3e;--brand-light: #fdf0eb;--brand-mid: #f0b9a4;--sidebar-w: 260px;--sidebar-bg: #1c1917;--sidebar-hover: rgba(255,255,255,.05);--sidebar-active: rgba(255,255,255,.09);--sidebar-border: rgba(255,255,255,.07);--surface: #ffffff;--bg: #faf9f7;--border: #e8e5e0;--border-light: #f2efea;--text-primary: #1a1714;--text-secondary: #4a4540;--text-muted: #8c8480;--text-xmuted: #bbb8b3;--red-bg: #fef2f2;--red-border: #fecaca;--red-text: #b91c1c;--radius-xs: 4px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 18px;--radius-xl: 24px;--shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);--shadow-md: 0 4px 16px rgba(0,0,0,.07), 0 2px 6px rgba(0,0,0,.04);--shadow-lg: 0 8px 32px rgba(0,0,0,.09), 0 2px 8px rgba(0,0,0,.05);--chat-max-w: 720px;--transition: .18s ease}::-webkit-scrollbar{width:5px;height:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#0000001c;border-radius:99px}::-webkit-scrollbar-thumb:hover{background:#0003}.app-shell{display:flex;height:100dvh;overflow:hidden;position:relative;background:var(--sidebar-bg)}.sidebar{width:var(--sidebar-w);flex-shrink:0;height:100dvh;background:var(--sidebar-bg);display:flex;flex-direction:column;z-index:50;transition:transform var(--transition)}.sidebar-overlay{display:none}.sidebar-header{padding:12px 8px 6px;display:flex;align-items:center;gap:6px}.sidebar-new-chat{flex:1;display:flex;align-items:center;gap:9px;padding:8px 11px;background:transparent;border:1px solid rgba(255,255,255,.09);border-radius:var(--radius-sm);color:#c8c4be;font-size:13px;font-weight:500;font-family:inherit;cursor:pointer;transition:background 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0;display:flex;align-items:center;gap:12px;flex-shrink:0}.chat-header-menu-btn{display:none;align-items:center;justify-content:center;width:34px;height:34px;background:transparent;border:none;border-radius:var(--radius-sm);cursor:pointer;color:var(--text-muted);flex-shrink:0;transition:background var(--transition),color var(--transition)}.chat-header-menu-btn:hover{background:var(--border-light);color:var(--text-primary)}.chat-header-title{font-size:15px;font-weight:600;color:var(--text-secondary);letter-spacing:-.1px}.chat-header-subtitle{font-size:12px;color:var(--text-muted);margin-top:1px}.chat-header-logo{width:30px;height:30px;background:var(--brand);border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.messages-area{flex:1;overflow-y:auto;display:flex;flex-direction:column;align-items:center;padding:24px 24px 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var(--transition);color:var(--text-muted)}.btn-icon:hover:not(:disabled){background:var(--bg);color:var(--text-secondary)}.btn-icon:disabled{opacity:.35;cursor:default}.btn-send{background:var(--brand);color:#fff;border-radius:10px}.btn-send:hover:not(:disabled){background:var(--brand-dark);color:#fff}.btn-send:disabled{background:var(--border);color:var(--text-xmuted)}.chat-textarea{flex:1;min-height:24px;max-height:180px;border:none;outline:none;resize:none;background:transparent;font-size:14.5px;font-family:inherit;line-height:1.55;color:var(--text-primary);padding:0;overflow-y:auto;align-self:center}.chat-textarea::placeholder{color:var(--text-xmuted)}.input-hint{text-align:center;font-size:11.5px;color:var(--text-xmuted);padding-top:6px}@keyframes dot-pulse{0%,80%,to{opacity:.22;transform:scale(.75)}40%{opacity:1;transform:scale(1)}}.nv-dot{width:7px;height:7px;background:var(--brand);border-radius:50%;display:inline-block;animation:dot-pulse 1.4s ease-in-out infinite;animation-delay:var(--d, 0s)}@keyframes msgFadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@keyframes spin{to{transform:rotate(360deg)}}.spinner{width:16px;height:16px;border:2px solid rgba(0,0,0,.08);border-top-color:var(--brand);border-radius:50%;animation:spin .7s linear infinite}.login-page{min-height:100dvh;display:flex;align-items:stretch;background:var(--bg);font-family:Inter,system-ui,sans-serif}.login-brand-panel{flex:1;background:var(--sidebar-bg);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 48px;gap:20px;min-height:100dvh}.login-brand-icon{width:60px;height:60px;background:var(--brand);border-radius:16px;display:flex;align-items:center;justify-content:center;margin-bottom:8px}.login-brand-name{font-size:34px;font-weight:700;color:#e8e3dd;letter-spacing:-.7px}.login-brand-tagline{font-size:14.5px;color:#6b6560;text-align:center;line-height:1.7;max-width:280px}.login-brand-features{display:flex;flex-direction:column;gap:14px;margin-top:16px;width:100%;max-width:300px}.login-feature-item{display:flex;align-items:center;gap:12px;font-size:13px;color:#6b6560}.login-feature-dot{width:7px;height:7px;background:var(--brand);border-radius:50%;flex-shrink:0}.login-form-panel{width:420px;min-width:420px;display:flex;align-items:center;justify-content:center;padding:48px 40px;background:var(--surface);border-left:1px solid var(--border)}.login-form-inner{width:100%;max-width:340px}.login-form-title{font-size:23px;font-weight:700;color:var(--text-primary);letter-spacing:-.4px;margin-bottom:6px}.login-form-sub{font-size:14px;color:var(--text-muted);margin-bottom:30px;line-height:1.5}.login-field{margin-bottom:18px}.login-label{display:block;font-size:13px;font-weight:500;color:var(--text-secondary);margin-bottom:7px}.login-input{width:100%;padding:10px 14px;font-size:14px;font-family:inherit;border:1.5px solid var(--border);border-radius:var(--radius-sm);outline:none;background:var(--surface);color:var(--text-primary);transition:border-color var(--transition),box-shadow var(--transition)}.login-input::placeholder{color:var(--text-xmuted)}.login-input:focus{border-color:var(--brand);box-shadow:0 0 0 3px #d977571f}.login-error{background:var(--red-bg);border:1px solid var(--red-border);border-radius:var(--radius-sm);padding:10px 14px;font-size:13px;color:var(--red-text);margin-bottom:18px;display:flex;align-items:center;gap:8px}.login-submit{width:100%;padding:11px 0;background:var(--brand);color:#fff;border:none;border-radius:var(--radius-sm);font-size:14px;font-weight:600;font-family:inherit;cursor:pointer;transition:background var(--transition),opacity var(--transition);margin-top:8px;display:flex;align-items:center;justify-content:center;gap:8px}.login-submit:hover:not(:disabled){background:var(--brand-dark)}.login-submit:disabled{opacity:.55;cursor:default}.loading-screen{min-height:100dvh;display:flex;align-items:center;justify-content:center;background:var(--bg);flex-direction:column;gap:14px;font-size:14px;color:var(--text-muted)}@media (max-width: 900px){.login-brand-panel{padding:40px 32px}.login-brand-name{font-size:28px}.main-area{border-radius:0;margin:0}}@media (max-width: 768px){.app-shell{background:var(--bg)}.main-area{border-radius:0;margin:0}.sidebar{position:fixed;top:0;left:0;transform:translate(-100%);box-shadow:6px 0 28px #0006}.sidebar.sidebar-open{transform:translate(0)}.sidebar-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;z-index:49;opacity:0;pointer-events:none;transition:opacity var(--transition);-webkit-backdrop-filter:blur(1px);backdrop-filter:blur(1px)}.sidebar-overlay.sidebar-open{opacity:1;pointer-events:auto}.sidebar-close-btn,.chat-header-menu-btn{display:flex}.login-brand-panel{display:none}.login-form-panel{width:100%;min-width:0;border-left:none;padding:32px 24px;background:var(--bg)}.login-form-inner{max-width:100%}.messages-area{padding:16px 16px 8px}.input-area{padding:8px 14px 16px}.msg-user-bubble,.msg-user-image-wrap{max-width:88%}.suggestion-chips{grid-template-columns:1fr}}@media (max-width: 480px){.chat-header{padding:12px 14px 0}.chat-header-title{font-size:14px}.empty-state h2{font-size:18px}.empty-state p{font-size:13.5px}.suggestion-chip{font-size:12.5px;padding:10px 14px}.input-area{padding:6px 10px 14px}.messages-area{padding:12px 12px 6px}}