:root{--bg-primary: #212121;--bg-secondary: #2f2f2f;--bg-tertiary: #171717;--bg-hover: #343434;--bg-input: #2f2f2f;--bg-button: #f4f4f4;--bg-sidebar: #171717;--text-primary: #ececec;--text-secondary: #8e8ea0;--text-tertiary: #6b6b6b;--text-inverse: #212121;--accent: #19c37d;--accent-hover: #1aab6d;--accent-glow: rgba(25, 195, 125, .15);--border: rgba(255, 255, 255, .08);--border-focus: rgba(255, 255, 255, .2);--radius-sm: 6px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 4px 12px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .5);--font-sans: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "DM Mono", "Courier New", monospace;--sidebar-width: 260px;--header-height: 60px;--input-max-width: 800px;--transition: .15s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow:hidden;height:100vh}#root{height:100vh;display:flex;flex-direction:column}.loading-screen{height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg-primary)}.spinner{width:36px;height:36px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#ffffff1f;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#fff3}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg-primary);padding:24px}.auth-card{width:100%;max-width:380px}.auth-logo{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:32px}.auth-logo-icon{width:36px;height:36px;background:var(--accent);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center}.auth-logo-text{font-size:20px;font-weight:600;letter-spacing:-.3px}.auth-title{font-size:28px;font-weight:600;text-align:center;margin-bottom:8px;letter-spacing:-.5px}.auth-subtitle{font-size:14px;color:var(--text-secondary);text-align:center;margin-bottom:32px}.auth-form{display:flex;flex-direction:column;gap:16px}.form-group{display:flex;flex-direction:column;gap:6px}.form-label{font-size:13px;font-weight:500;color:var(--text-secondary)}.form-input{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-md);padding:12px 16px;color:var(--text-primary);font-family:var(--font-sans);font-size:15px;outline:none;transition:border-color var(--transition),box-shadow var(--transition);width:100%}.form-input:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px #ffffff0d}.form-input::placeholder{color:var(--text-tertiary)}.btn-primary{background:#f4f4f4;color:#0d0d0d;border:none;border-radius:var(--radius-md);padding:13px 20px;font-family:var(--font-sans);font-size:15px;font-weight:600;cursor:pointer;transition:background var(--transition),transform var(--transition);width:100%;margin-top:4px}.btn-primary:hover:not(:disabled){background:#e8e8e8}.btn-primary:active:not(:disabled){transform:scale(.98)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.auth-footer{text-align:center;margin-top:24px;font-size:14px;color:var(--text-secondary)}.auth-link{color:var(--text-primary);text-decoration:none;font-weight:500}.auth-link:hover{text-decoration:underline}.error-message{background:#ef44441f;border:1px solid rgba(239,68,68,.25);color:#f87171;padding:10px 14px;border-radius:var(--radius-md);font-size:13px;margin-bottom:8px}.chat-layout{display:flex;height:100vh;overflow:hidden}.sidebar{width:var(--sidebar-width);background:var(--bg-sidebar);display:flex;flex-direction:column;flex-shrink:0;border-right:1px solid var(--border);overflow:hidden;transition:width var(--transition)}.sidebar-header{padding:12px 12px 8px;display:flex;align-items:center;gap:8px}.sidebar-logo{display:flex;align-items:center;gap:8px;padding:8px;border-radius:var(--radius-md);text-decoration:none;color:var(--text-primary);flex:1}.sidebar-logo-icon{width:28px;height:28px;background:var(--accent);border-radius:6px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.sidebar-logo-text{font-size:15px;font-weight:600;letter-spacing:-.3px}.btn-icon{width:36px;height:36px;background:transparent;border:none;border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background var(--transition),color var(--transition);flex-shrink:0}.btn-icon:hover{background:var(--bg-hover);color:var(--text-primary)}.sidebar-new-chat{padding:4px 12px 8px}.btn-new-chat{display:flex;align-items:center;gap:8px;width:100%;padding:10px 12px;background:transparent;border:none;border-radius:var(--radius-md);color:var(--text-primary);font-family:var(--font-sans);font-size:14px;font-weight:500;cursor:pointer;transition:background var(--transition);text-align:left}.btn-new-chat:hover{background:var(--bg-hover)}.sidebar-section-label{padding:8px 20px 4px;font-size:11px;font-weight:600;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.5px}.sidebar-conversations{flex:1;overflow-y:auto;padding:0 8px}.conv-item{display:flex;align-items:center;gap:8px;padding:8px 12px;border-radius:var(--radius-md);cursor:pointer;transition:background var(--transition);text-decoration:none;color:var(--text-primary);position:relative;group:true}.conv-item:hover{background:var(--bg-hover)}.conv-item.active{background:var(--bg-secondary)}.conv-item-text{flex:1;font-size:13.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--text-primary)}.conv-item-actions{display:none;gap:2px}.conv-item:hover .conv-item-actions{display:flex}.conv-action-btn{width:24px;height:24px;background:transparent;border:none;border-radius:4px;color:var(--text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background var(--transition),color var(--transition)}.conv-action-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.conv-action-btn.delete:hover{color:#f87171}.sidebar-footer{padding:8px 12px 12px;border-top:1px solid var(--border);margin-top:4px}.user-menu{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:var(--radius-md);cursor:pointer;transition:background var(--transition);background:transparent;border:none;width:100%;text-align:left;color:var(--text-primary)}.user-menu:hover{background:var(--bg-hover)}.user-avatar{width:32px;height:32px;background:linear-gradient(135deg,#667eea,#764ba2);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;color:#fff;flex-shrink:0}.user-info{flex:1;overflow:hidden}.user-name{font-size:13px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-email{font-size:11px;color:var(--text-tertiary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-main{flex:1;display:flex;flex-direction:column;overflow:hidden;background:var(--bg-primary);position:relative}.chat-header{height:var(--header-height);display:flex;align-items:center;justify-content:space-between;padding:0 16px;border-bottom:1px solid var(--border);flex-shrink:0}.chat-header-title{font-size:15px;font-weight:500;color:var(--text-secondary)}.model-badge{display:flex;align-items:center;gap:6px;padding:4px 10px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-full);font-size:12px;font-weight:500;color:var(--text-secondary)}.model-dot{width:6px;height:6px;background:var(--accent);border-radius:50%;animation:pulse 2s ease infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}.messages-container{flex:1;overflow-y:auto;padding:0}.messages-inner{max-width:var(--input-max-width);margin:0 auto;padding:32px 24px;display:flex;flex-direction:column;gap:0;min-height:100%}.welcome-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;padding:48px 24px;text-align:center}.welcome-icon{width:56px;height:56px;background:linear-gradient(135deg,var(--accent) 0%,#0ea5e9 100%);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;margin:0 auto 20px;box-shadow:0 8px 32px #19c37d40}.welcome-title{font-size:26px;font-weight:600;letter-spacing:-.5px;margin-bottom:8px}.welcome-subtitle{font-size:15px;color:var(--text-secondary);max-width:360px;line-height:1.6;margin-bottom:40px}.welcome-suggestions{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;max-width:600px;width:100%}.suggestion-card{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);padding:14px 16px;cursor:pointer;transition:background var(--transition),border-color var(--transition),transform var(--transition);text-align:left}.suggestion-card:hover{background:var(--bg-hover);border-color:var(--border-focus);transform:translateY(-1px)}.suggestion-card-label{font-size:13px;font-weight:500;color:var(--text-primary);margin-bottom:2px}.suggestion-card-sub{font-size:12px;color:var(--text-tertiary)}.message-group{display:flex;flex-direction:column;gap:4px;padding:16px 0}.message-group+.message-group{border-top:1px solid rgba(255,255,255,.04)}.message-row{display:flex;gap:14px;align-items:flex-start}.message-row.user{flex-direction:row-reverse}.msg-avatar{width:32px;height:32px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;margin-top:2px}.msg-avatar.user{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.msg-avatar.assistant{background:linear-gradient(135deg,var(--accent) 0%,#0ea5e9 100%);color:#fff}.msg-content{flex:1;max-width:calc(100% - 46px)}.message-row.user .msg-content{display:flex;justify-content:flex-end}.msg-bubble{padding:10px 16px;border-radius:var(--radius-lg);font-size:15px;line-height:1.65;word-break:break-word}.msg-bubble.user{background:var(--bg-secondary);color:var(--text-primary);border-radius:var(--radius-lg) var(--radius-lg) var(--radius-sm) var(--radius-lg);max-width:75%}.msg-bubble.assistant{background:transparent;color:var(--text-primary);padding:4px 0}.msg-image-wrapper{margin-top:12px}.msg-image{max-width:100%;width:400px;max-height:400px;object-fit:cover;border-radius:var(--radius-lg);border:1px solid var(--border);display:block;cursor:zoom-in;transition:transform var(--transition),box-shadow var(--transition)}.msg-image:hover{transform:scale(1.01);box-shadow:var(--shadow-lg)}.msg-image-actions{display:flex;gap:8px;margin-top:8px}.btn-image-action{display:flex;align-items:center;gap:5px;padding:5px 10px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:12px;cursor:pointer;transition:background var(--transition),color var(--transition);font-family:var(--font-sans)}.btn-image-action:hover{background:var(--bg-hover);color:var(--text-primary)}.msg-timestamp{font-size:11px;color:var(--text-tertiary);margin-top:4px;padding:0 4px}.message-row.user .msg-timestamp{text-align:right}.typing-indicator{display:flex;align-items:center;gap:4px;padding:12px 0}.typing-dot{width:6px;height:6px;background:var(--accent);border-radius:50%;animation:typing 1.4s ease infinite}.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}@keyframes typing{0%,60%,to{transform:translateY(0);opacity:.4}30%{transform:translateY(-6px);opacity:1}}.input-area{padding:16px 24px 24px;flex-shrink:0}.input-wrapper{max-width:var(--input-max-width);margin:0 auto}.input-container{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-xl);padding:14px 16px;display:flex;align-items:flex-end;gap:10px;transition:border-color var(--transition),box-shadow var(--transition)}.input-container:focus-within{border-color:var(--border-focus);box-shadow:0 0 0 4px #ffffff0a}.chat-input{flex:1;background:transparent;border:none;outline:none;color:var(--text-primary);font-family:var(--font-sans);font-size:15px;line-height:1.5;resize:none;min-height:24px;max-height:200px;overflow-y:auto}.chat-input::placeholder{color:var(--text-tertiary)}.input-controls{display:flex;align-items:center;gap:8px;flex-shrink:0}.size-select{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-sm);padding:4px 8px;color:var(--text-secondary);font-family:var(--font-sans);font-size:12px;cursor:pointer;outline:none}.btn-send{width:34px;height:34px;background:var(--bg-button);border:none;border-radius:var(--radius-md);color:var(--text-inverse);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background var(--transition),transform var(--transition);flex-shrink:0}.btn-send:hover:not(:disabled){background:#e0e0e0}.btn-send:active:not(:disabled){transform:scale(.93)}.btn-send:disabled{background:var(--bg-hover);color:var(--text-tertiary);cursor:not-allowed}.input-footer{text-align:center;font-size:12px;color:var(--text-tertiary);margin-top:10px}.lightbox{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000e6;display:flex;align-items:center;justify-content:center;z-index:1000;padding:24px;animation:fadeIn .15s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.lightbox-img{max-width:90vw;max-height:90vh;object-fit:contain;border-radius:var(--radius-lg)}.lightbox-close{position:absolute;top:16px;right:16px;width:40px;height:40px;background:#ffffff1a;border:none;border-radius:50%;color:#fff;font-size:20px;cursor:pointer;display:flex;align-items:center;justify-content:center}.lightbox-close:hover{background:#fff3}.user-dropdown{position:absolute;bottom:60px;left:12px;width:calc(var(--sidebar-width) - 24px);background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-lg);z-index:100;animation:slideUp .15s ease}@keyframes slideUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.dropdown-item{display:flex;align-items:center;gap:10px;padding:11px 16px;font-size:14px;color:var(--text-primary);cursor:pointer;transition:background var(--transition);border:none;background:transparent;width:100%;font-family:var(--font-sans)}.dropdown-item:hover{background:var(--bg-hover)}.dropdown-item.danger{color:#f87171}@media (max-width: 768px){.sidebar{display:none}.welcome-suggestions{grid-template-columns:1fr}.msg-image{width:100%}}.message-enter{animation:messageSlide .2s ease}@keyframes messageSlide{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.generating-text{color:var(--accent);font-size:14px;display:flex;align-items:center;gap:8px}