*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg:#f0f4f9;--color-bg-secondary:#fff;--color-sidebar-bg:#f0f4f9;--color-sidebar-hover:#e2e8f2;--color-sidebar-active:#d6e4f7;--color-border:#dadce0;--color-border-subtle:#e8eaf0;--color-text-primary:#1f2329;--color-text-secondary:#5f6368;--color-text-muted:#9aa0a6;--color-input-bg:#fff;--color-input-border:#dadce0;--color-input-shadow:0 2px 12px #00000014;--color-chip-bg:#fff;--color-chip-border:#dadce0;--color-chip-hover:#f0f4f9;--color-header-bg:#f0f4f9f2;--color-login-card-bg:#e8f0fe;--color-login-card-border:#c5d5f5;--color-login-link:#1a73e8;--color-footer:#5f6368;--color-brand-primary:#005eb8;--color-brand-secondary:#0073e6;--color-brand-gradient:linear-gradient(135deg, #005eb8 0%, #00a0dc 50%, #00c2a8 100%);--color-brand-gradient-text:linear-gradient(135deg, #005eb8, #00a0dc);--color-accent:#0073e6;--color-accent-soft:#e8f0fe;--transition-fast:.15s ease;--transition-normal:.25s ease;--transition-slow:.4s ease;--radius-sm:8px;--radius-md:12px;--radius-lg:24px;--radius-xl:32px;--sidebar-width:260px;--header-height:64px;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;font-family:Inter,Google Sans,-apple-system,BlinkMacSystemFont,sans-serif}[data-theme=dark]{--color-bg:#0d1117;--color-bg-secondary:#161b22;--color-sidebar-bg:#0d1117;--color-sidebar-hover:#1c2333;--color-sidebar-active:#1f2d45;--color-border:#30363d;--color-border-subtle:#21262d;--color-text-primary:#e6edf3;--color-text-secondary:#8b949e;--color-text-muted:#484f58;--color-input-bg:#1c2333;--color-input-border:#30363d;--color-input-shadow:0 2px 20px #0006;--color-chip-bg:#1c2333;--color-chip-border:#30363d;--color-chip-hover:#243046;--color-header-bg:#0d1117f2;--color-login-card-bg:#1c2333;--color-login-card-border:#30363d;--color-login-link:#58a6ff;--color-footer:#484f58;--color-accent:#58a6ff;--color-accent-soft:#1f3a5f;--color-brand-gradient-text:linear-gradient(135deg, #58a6ff, 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svg{fill:#fff;width:18px;height:18px}.sidebar-logo-text{background:var(--color-brand-gradient-text);-webkit-text-fill-color:transparent;letter-spacing:-.3px;-webkit-background-clip:text;background-clip:text;font-size:17px;font-weight:600}.sidebar-icon-btn{border-radius:var(--radius-sm);cursor:pointer;width:36px;height:36px;color:var(--color-text-secondary);transition:background var(--transition-fast), color var(--transition-fast);background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;display:flex}.sidebar-icon-btn:hover{background:var(--color-sidebar-hover);color:var(--color-text-primary)}.sidebar-nav{flex-direction:column;gap:2px;padding:8px 8px 0;display:flex}.sidebar-nav-item{border-radius:var(--radius-md);color:var(--color-text-secondary);cursor:pointer;text-align:left;width:100%;transition:background var(--transition-fast), color var(--transition-fast);background:0 0;border:none;align-items:center;gap:12px;padding:10px 12px;font-family:inherit;font-size:14px;text-decoration:none;display:flex}.sidebar-nav-item:hover{background:var(--color-sidebar-hover);color:var(--color-text-primary)}.sidebar-nav-item.active{background:var(--color-sidebar-active);color:var(--color-brand-primary)}.sidebar-nav-item svg{opacity:.7;flex-shrink:0;width:18px;height:18px}.sidebar-section-label{color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.8px;padding:16px 20px 6px;font-size:12px;font-weight:600}.sidebar-conversations{flex:1;padding:0 8px;overflow-y:auto}.sidebar-conv-item{border-radius:var(--radius-md);cursor:pointer;text-align:left;width:100%;transition:background var(--transition-fast);background:0 0;border:none;align-items:center;gap:10px;padding:9px 12px;display:flex}.sidebar-conv-item:hover{background:var(--color-sidebar-hover)}.sidebar-conv-item svg{width:16px;height:16px;color:var(--color-text-muted);flex-shrink:0}.sidebar-conv-title{color:var(--color-text-secondary);white-space:nowrap;text-overflow:ellipsis;flex:1;font-size:13.5px;overflow:hidden}.sidebar-login-card{background:var(--color-login-card-bg);border:1px solid var(--color-login-card-border);border-radius:var(--radius-md);margin:12px;padding:14px 16px}.sidebar-login-card p{color:var(--color-text-secondary);font-size:13px;line-height:1.5}.sidebar-login-card p strong{color:var(--color-text-primary);margin-bottom:4px;font-size:13.5px;display:block}.sidebar-login-link{color:var(--color-login-link);transition:opacity var(--transition-fast);margin-top:10px;font-size:13.5px;font-weight:600;text-decoration:none;display:inline-block}.sidebar-login-link:hover{opacity:.8;text-decoration:underline}.sidebar-user{border-top:1px solid var(--color-border);cursor:pointer;border-radius:var(--radius-md);transition:background var(--transition-fast);align-items:center;gap:10px;margin:0 4px 4px;padding:12px 8px;display:flex}.sidebar-user:hover{background:var(--color-sidebar-hover)}.user-avatar{background:var(--color-brand-gradient);color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:34px;height:34px;font-size:14px;font-weight:700;display:flex}.user-name{color:var(--color-text-primary);flex:1;font-size:13.5px;font-weight:500}.sidebar-user .sidebar-icon-btn{width:28px;height:28px}.main-content{flex-direction:column;flex:1;display:flex;position:relative;overflow:hidden}.top-header{height:var(--header-height);background:var(--color-header-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--color-border-subtle);z-index:5;transition:background var(--transition-normal);justify-content:space-between;align-items:center;padding:0 32px;display:flex;position:sticky;top:0}.top-header-logo{background:var(--color-brand-gradient-text);-webkit-text-fill-color:transparent;letter-spacing:-.5px;-webkit-background-clip:text;background-clip:text;font-size:22px;font-weight:700}.top-header-nav{align-items:center;gap:4px;display:flex}.top-header-nav a{color:var(--color-text-secondary);border-radius:var(--radius-sm);transition:background var(--transition-fast), color var(--transition-fast);padding:8px 14px;font-size:13.5px;text-decoration:none}.top-header-nav a:hover{background:var(--color-sidebar-hover);color:var(--color-text-primary)}.top-header-actions{align-items:center;gap:10px;display:flex}.theme-toggle-btn{border:1px solid var(--color-border);background:var(--color-bg-secondary);cursor:pointer;width:40px;height:40px;color:var(--color-text-secondary);transition:all var(--transition-fast);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;display:flex}.theme-toggle-btn:hover{background:var(--color-sidebar-hover);color:var(--color-text-primary);border-color:var(--color-text-muted);transform:scale(1.05)}.theme-toggle-btn svg{width:18px;height:18px;transition:transform var(--transition-normal)}.btn-login{background:var(--color-brand-primary);color:#fff;border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;border:none;padding:9px 22px;font-family:inherit;font-size:14px;font-weight:500}.btn-login:hover{background:var(--color-brand-secondary);transform:translateY(-1px);box-shadow:0 4px 12px #005eb859}.chat-area{flex-direction:column;flex:1;justify-content:center;align-items:center;padding:32px 24px;display:flex;position:relative;overflow-y:auto}[data-theme=dark] .chat-area{background:radial-gradient(80% 60% at 50% 40%,#005eb81f 0%,#0000 70%)}.chat-welcome{flex-direction:column;align-items:center;width:100%;max-width:740px;animation:.5s both fadeInUp;display:flex}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.chat-greeting{color:var(--color-text-primary);text-align:center;letter-spacing:-.5px;margin-bottom:32px;font-size:clamp(28px,4vw,44px);font-weight:600;line-height:1.2}[data-theme=dark] .chat-greeting{background:linear-gradient(135deg,#e6edf3 30%,#79c0ff 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.input-wrapper{background:var(--color-input-bg);border:1.5px solid var(--color-input-border);border-radius:var(--radius-xl);width:100%;max-width:740px;box-shadow:var(--color-input-shadow);transition:all var(--transition-normal);padding:14px 16px 10px;position:relative}.input-wrapper:focus-within{border-color:var(--color-accent);box-shadow:0 0 0 3px #0073e61f, var(--color-input-shadow)}[data-theme=dark] .input-wrapper:focus-within{box-shadow:0 0 0 3px #58a6ff26, var(--color-input-shadow)}.chat-input{resize:none;width:100%;color:var(--color-text-primary);background:0 0;border:none;outline:none;min-height:28px;max-height:140px;font-family:inherit;font-size:15px;line-height:1.5;overflow-y:auto}.chat-input::placeholder{color:var(--color-text-muted)}.input-toolbar{justify-content:space-between;align-items:center;gap:8px;margin-top:8px;display:flex}.input-toolbar-left{align-items:center;gap:4px;display:flex}.input-toolbar-right{align-items:center;gap:8px;display:flex}.toolbar-btn{border-radius:var(--radius-sm);cursor:pointer;color:var(--color-text-secondary);transition:background var(--transition-fast), color var(--transition-fast);background:0 0;border:none;align-items:center;gap:6px;padding:6px 10px;font-family:inherit;font-size:13px;display:flex}.toolbar-btn:hover{background:var(--color-sidebar-hover);color:var(--color-text-primary)}.toolbar-btn svg{width:18px;height:18px}.model-badge{border:1px solid var(--color-border);border-radius:var(--radius-lg);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast);background:0 0;align-items:center;gap:4px;padding:5px 10px;font-family:inherit;font-size:12.5px;font-weight:500;display:flex}.model-badge:hover{background:var(--color-sidebar-hover)}.model-badge svg{width:14px;height:14px}.voice-btn{cursor:pointer;width:34px;height:34px;color:var(--color-text-secondary);transition:all var(--transition-fast);background:0 0;border:none;border-radius:50%;justify-content:center;align-items:center;display:flex}.voice-btn:hover{background:var(--color-sidebar-hover);color:var(--color-text-primary)}.voice-btn svg{width:18px;height:18px}.suggestions-row{flex-wrap:wrap;justify-content:center;gap:10px;margin-top:20px;display:flex}.suggestion-chip{background:var(--color-chip-bg);border:1.5px solid var(--color-chip-border);border-radius:var(--radius-lg);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;align-items:center;gap:8px;padding:10px 18px;font-family:inherit;font-size:13.5px;font-weight:500;display:flex}.suggestion-chip:hover{background:var(--color-chip-hover);color:var(--color-text-primary);border-color:var(--color-accent);transform:translateY(-2px);box-shadow:0 4px 12px #00000014}[data-theme=dark] .suggestion-chip:hover{box-shadow:0 4px 12px #0000004d}.suggestion-chip .chip-icon{font-size:16px}.chat-footer{text-align:center;color:var(--color-footer);padding:16px 24px;font-size:12px;line-height:1.6}.chat-footer a{color:var(--color-footer);transition:color var(--transition-fast);text-decoration:underline}.chat-footer a:hover{color:var(--color-text-secondary)}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:100;background:#00000080;justify-content:center;align-items:center;animation:.2s fadeIn;display:flex;position:fixed;inset:0}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-card{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-lg);width:420px;max-width:95vw;padding:40px;animation:.3s slideUp;box-shadow:0 24px 80px #0003}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)scale(.97)}to{opacity:1;transform:translateY(0)scale(1)}}.modal-logo{align-items:center;gap:10px;margin-bottom:24px;display:flex}.modal-logo-icon{background:var(--color-brand-gradient);border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;display:flex}.modal-logo-icon svg{fill:#fff;width:22px;height:22px}.modal-logo-text{background:var(--color-brand-gradient-text);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:20px;font-weight:700}.modal-title{color:var(--color-text-primary);margin-bottom:6px;font-size:22px;font-weight:600}.modal-subtitle{color:var(--color-text-secondary);margin-bottom:28px;font-size:14px;line-height:1.5}.form-group{margin-bottom:16px}.form-label{color:var(--color-text-secondary);margin-bottom:6px;font-size:13px;font-weight:500;display:block}.form-input{background:var(--color-input-bg);border:1.5px solid var(--color-input-border);border-radius:var(--radius-sm);width:100%;color:var(--color-text-primary);transition:border-color var(--transition-fast), box-shadow var(--transition-fast);outline:none;padding:11px 14px;font-family:inherit;font-size:14px}.form-input:focus{border-color:var(--color-accent);box-shadow:0 0 0 3px #0073e61a}.btn-submit{background:var(--color-brand-gradient);color:#fff;border-radius:var(--radius-sm);cursor:pointer;width:100%;transition:opacity var(--transition-fast), transform var(--transition-fast);letter-spacing:.3px;border:none;margin-top:8px;padding:12px;font-family:inherit;font-size:15px;font-weight:600}.btn-submit:hover{opacity:.92;transform:translateY(-1px)}.btn-submit:disabled{opacity:.75;cursor:not-allowed;transform:none}.btn-submit-content{justify-content:center;align-items:center;gap:8px;display:inline-flex}.spinner{border:2px solid #fff6;border-top-color:#fff;border-radius:50%;flex-shrink:0;width:16px;height:16px;animation:.7s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.modal-close{border-radius:var(--radius-sm);cursor:pointer;width:36px;height:36px;color:var(--color-text-secondary);transition:background var(--transition-fast);background:0 0;border:none;justify-content:center;align-items:center;font-size:18px;display:flex;position:absolute;top:0;right:0}.modal-close:hover{background:var(--color-sidebar-hover)}.modal-card-inner{position:relative}.logout-btn{border:1.5px solid var(--color-border);border-radius:var(--radius-lg);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast);background:0 0;padding:7px 16px;font-family:inherit;font-size:13px;font-weight:500}.logout-btn:hover{color:#e11d48;background:#e11d480d;border-color:#e11d48}@media (width<=768px){.sidebar{width:220px}.top-header{padding:0 16px}.top-header-nav{display:none}.chat-area{padding:24px 16px}.suggestions-row{gap:8px}.suggestion-chip{padding:8px 14px;font-size:13px}}@media (width<=560px){.sidebar{z-index:20;transition:left var(--transition-normal);position:fixed;top:0;bottom:0;left:-260px}}