:root{--bg-page: #f7f7f8;--bg-white: #ffffff;--bg-subtle: #f0f0f2;--bg-code: #f4f4f7;--bg-user-msg: #e8e6f0;--accent: #4f46e5;--accent-light: #e8e6fb;--accent-hover: #4338ca;--danger: #dc2626;--danger-light: #fee2e2;--text-primary: #1a1a1a;--text-body: #2d2d2d;--text-secondary: #6b6b6b;--text-muted: #9a9a9a;--text-code: #c7254e;--border: #e2e2e5;--border-strong: #d0d0d4;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 2px 8px rgba(0, 0, 0, .08);--transition: .15s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,system-ui,sans-serif;background:var(--bg-page);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app{display:flex;flex-direction:column;height:100vh;overflow:hidden}.header{background:var(--bg-white);border-bottom:1px solid var(--border);padding:0 24px;height:56px;display:flex;align-items:center;justify-content:space-between;flex-shrink:0;box-shadow:var(--shadow-sm);position:relative;z-index:10}.header-brand{display:flex;align-items:center;gap:10px}.header-logo{width:30px;height:30px;border-radius:8px;background:var(--accent);display:flex;align-items:center;justify-content:center;font-family:JetBrains Mono,monospace;font-weight:700;font-size:14px;color:#fff;flex-shrink:0}.header h1{font-size:16px;font-weight:700;letter-spacing:-.02em;color:var(--text-primary)}.header h1 span{color:var(--text-muted);font-weight:500;margin-left:6px;font-size:14px}.header-controls{display:flex;align-items:center;gap:10px}.branch-selector{position:relative}.branch-selector-trigger{display:flex;align-items:center;gap:8px;padding:7px 12px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-white);color:var(--text-primary);font-family:JetBrains Mono,monospace;font-size:13px;cursor:pointer;transition:border-color var(--transition),box-shadow var(--transition);min-width:200px;max-width:320px}.branch-selector-trigger:hover:not(:disabled){border-color:var(--border-strong)}.branch-selector-trigger:disabled{opacity:.5;cursor:not-allowed}.branch-selector-icon{color:var(--accent);font-size:15px;flex-shrink:0}.branch-selector-text{flex:1;text-align:left;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.branch-selector-text.placeholder{color:var(--text-muted)}.branch-selector-chevron{flex-shrink:0;font-size:14px;color:var(--text-muted);transform:rotate(-90deg);transition:transform var(--transition)}.branch-selector-chevron.open{transform:rotate(90deg)}.branch-dropdown{position:absolute;top:calc(100% + 4px);left:0;min-width:100%;width:max-content;max-width:400px;background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:0 8px 24px #0000001f;z-index:100;animation:dropdown-in .12s ease-out}@keyframes dropdown-in{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.branch-search{padding:8px;border-bottom:1px solid var(--border)}.branch-search input{width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-page);color:var(--text-primary);font-family:JetBrains Mono,monospace;font-size:13px;outline:none;transition:border-color var(--transition),box-shadow var(--transition)}.branch-search input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light);background:var(--bg-white)}.branch-search input::placeholder{color:var(--text-muted)}.branch-list{max-height:260px;overflow-y:auto;padding:4px}.branch-list::-webkit-scrollbar{width:6px}.branch-list::-webkit-scrollbar-track{background:transparent}.branch-list::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.branch-item{display:block;width:100%;padding:8px 10px;border:none;border-radius:var(--radius-sm);background:transparent;color:var(--text-primary);font-family:JetBrains Mono,monospace;font-size:13px;text-align:left;cursor:pointer;transition:background var(--transition);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.branch-item:hover{background:var(--bg-subtle)}.branch-item.active{background:var(--accent-light);color:var(--accent);font-weight:600}.branch-empty{padding:16px 10px;text-align:center;color:var(--text-muted);font-size:13px}.btn-new{padding:8px 18px;border-radius:var(--radius-sm);border:none;background:var(--accent);color:#fff;font-family:Inter,sans-serif;font-size:13px;font-weight:600;cursor:pointer;transition:all var(--transition);letter-spacing:-.01em}.btn-new:hover:not(:disabled){background:var(--accent-hover);box-shadow:var(--shadow-md)}.btn-new:disabled{opacity:.4;cursor:not-allowed}.main{flex:1;overflow:hidden;display:flex;flex-direction:column}.welcome{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:40px}.welcome-icon{width:60px;height:60px;border-radius:14px;background:var(--bg-white);border:1px solid var(--border);box-shadow:var(--shadow-sm);display:flex;align-items:center;justify-content:center;font-family:JetBrains Mono,monospace;font-size:24px;color:var(--accent);animation:welcome-float 3s ease-in-out infinite}@keyframes welcome-float{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}.welcome-text{color:var(--text-secondary);font-size:15px;text-align:center;line-height:1.6}.welcome-hint{font-family:JetBrains Mono,monospace;font-size:12px;color:var(--text-muted);padding:6px 14px;background:var(--bg-white);border-radius:100px;border:1px solid var(--border)}.welcome-notice{font-size:12px;color:var(--text-muted);text-align:center;line-height:1.5;max-width:420px}.chat{flex:1;display:flex;flex-direction:column;overflow:hidden}.chat-messages{flex:1;overflow-y:auto;padding:24px;scroll-behavior:smooth}.chat-messages::-webkit-scrollbar{width:7px}.chat-messages::-webkit-scrollbar-track{background:transparent}.chat-messages::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}.chat-messages::-webkit-scrollbar-thumb:hover{background:var(--border-strong)}.messages{display:flex;flex-direction:column;gap:6px;max-width:860px;margin:0 auto;width:100%}.messages-empty{text-align:center;color:var(--text-muted);margin-top:80px;font-size:15px}.message{padding:16px 20px;border-radius:var(--radius-md);animation:msg-in .25s ease-out}@keyframes msg-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.message-user{background:var(--accent);color:#fff;margin-left:auto;max-width:70%;border-radius:var(--radius-md) var(--radius-md) 4px var(--radius-md)}.message-user .message-header{display:none}.message-user .message-content{color:#fff;font-size:15px}.message-assistant{background:var(--bg-white);border:1px solid var(--border);box-shadow:var(--shadow-sm);max-width:100%}.message-header{font-family:JetBrains Mono,monospace;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;margin-bottom:10px;color:var(--accent)}.message-content{font-size:15px;line-height:1.75;color:var(--text-body)}.message-content p{margin-bottom:12px}.message-content p:last-child{margin-bottom:0}.message-content h1,.message-content h2,.message-content h3{font-weight:700;letter-spacing:-.02em;color:var(--text-primary)}.message-content h1{font-size:20px;margin:20px 0 10px}.message-content h2{font-size:17px;margin:18px 0 8px;padding-bottom:6px;border-bottom:1px solid var(--border)}.message-content h3{font-size:15px;margin:14px 0 6px;color:var(--accent)}.message-content strong{font-weight:700;color:var(--text-primary)}.message-content ul,.message-content ol{padding-left:22px;margin-bottom:12px}.message-content li{margin-bottom:5px}.message-content li::marker{color:var(--accent)}.message-content code{font-family:JetBrains Mono,monospace;font-size:13px;background:#f0edfa;padding:2px 7px;border-radius:4px;color:#6d28d9}.message-content pre{background:#fafafa;border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px 18px;overflow-x:auto;margin:12px 0}.message-content pre code{background:none;padding:0;font-size:13px;line-height:1.7;color:#1a1a2e}.message-content pre::-webkit-scrollbar{height:5px}.message-content pre::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:3px}.message-content a{color:var(--accent);text-decoration:underline;text-underline-offset:2px;transition:color var(--transition)}.message-content a:hover{color:var(--accent-hover)}.message-meta{margin-top:12px;padding-top:10px;border-top:1px solid var(--border);font-family:JetBrains Mono,monospace;font-size:12px;color:var(--text-muted);display:flex;gap:16px;align-items:flex-start}.referenced-files summary{cursor:pointer;transition:color var(--transition)}.referenced-files summary:hover{color:var(--text-secondary)}.referenced-files ul{margin-top:6px;padding-left:16px;font-family:JetBrains Mono,monospace;font-size:12px;color:var(--text-secondary)}.referenced-files li{margin-bottom:2px}.thinking{display:flex;align-items:center;gap:10px;padding:16px 20px;color:var(--text-secondary);font-size:14px;animation:msg-in .25s ease-out}.spinner{display:inline-block;width:16px;height:16px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.error{color:var(--danger);background:var(--danger-light);border:1px solid #fca5a5;padding:12px 16px;border-radius:var(--radius-sm);font-size:14px;margin:8px 0;animation:msg-in .25s ease-out}.error-detail{padding:16px 20px}.error-detail .error-title{font-weight:700;font-size:14px;margin-bottom:6px}.error-detail .error-reason{font-size:13px;margin-bottom:12px;line-height:1.5}.error-detail .error-meta{display:flex;flex-wrap:wrap;gap:6px 14px;font-family:JetBrains Mono,monospace;font-size:12px;color:#9a3a3a;margin-bottom:10px}.error-detail .error-meta code{background:#dc262614;padding:1px 5px;border-radius:3px;font-size:11px}.error-detail .error-hint{font-size:13px;color:#7a3a3a;font-style:italic}.chat-input{display:flex;align-items:flex-end;gap:10px;padding:16px 24px 20px;background:var(--bg-white);border-top:1px solid var(--border)}.chat-input textarea{flex:1;padding:11px 14px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--bg-page);color:var(--text-primary);font-family:Inter,sans-serif;font-size:15px;line-height:1.5;resize:none;overflow-y:auto;min-height:44px;max-height:200px;outline:none;transition:border-color var(--transition),box-shadow var(--transition)}.chat-input textarea::placeholder{color:var(--text-muted)}.chat-input textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light);background:var(--bg-white)}.chat-input textarea:disabled{opacity:.5}.chat-input button{padding:11px 22px;border:none;border-radius:var(--radius-md);background:var(--accent);color:#fff;font-family:Inter,sans-serif;font-size:14px;font-weight:600;cursor:pointer;transition:all var(--transition);flex-shrink:0;min-height:44px}.chat-input button:hover:not(:disabled){background:var(--accent-hover);box-shadow:var(--shadow-md)}.chat-input button:disabled{opacity:.35;cursor:not-allowed}.btn-cancel{padding:11px 22px;border:1px solid var(--danger)!important;border-radius:var(--radius-md);background:transparent!important;color:var(--danger)!important;font-family:Inter,sans-serif;font-size:14px;font-weight:600;cursor:pointer;transition:all var(--transition);flex-shrink:0;min-height:44px}.btn-cancel:hover{background:var(--danger-light)!important}.login-page{display:flex;align-items:center;justify-content:center;min-height:100vh;background:var(--bg-page);padding:24px}.login-card{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:40px 36px 36px;width:100%;max-width:380px;display:flex;flex-direction:column;gap:20px}.login-header{display:flex;align-items:center;gap:10px;margin-bottom:4px}.login-header h2{font-size:18px;font-weight:700;letter-spacing:-.02em;color:var(--text-primary)}.login-header h2 span{color:var(--text-muted);font-weight:500;margin-left:6px;font-size:16px}.login-field{display:flex;flex-direction:column;gap:6px}.login-field span{font-size:13px;font-weight:600;color:var(--text-secondary)}.login-field input{padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-page);color:var(--text-primary);font-family:Inter,sans-serif;font-size:14px;outline:none;transition:border-color var(--transition),box-shadow var(--transition)}.login-field input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light);background:var(--bg-white)}.login-field input:disabled{opacity:.5}.login-error{color:var(--danger);background:var(--danger-light);border:1px solid #fca5a5;padding:10px 14px;border-radius:var(--radius-sm);font-size:13px}.login-submit{padding:10px 0;border:none;border-radius:var(--radius-sm);background:var(--accent);color:#fff;font-family:Inter,sans-serif;font-size:14px;font-weight:600;cursor:pointer;transition:all var(--transition)}.login-submit:hover:not(:disabled){background:var(--accent-hover);box-shadow:var(--shadow-md)}.login-submit:disabled{opacity:.4;cursor:not-allowed}.header-user{display:flex;align-items:center;gap:10px;margin-left:8px;padding-left:16px;border-left:1px solid var(--border)}.header-username{font-family:JetBrains Mono,monospace;font-size:13px;color:var(--text-secondary)}.btn-logout{padding:6px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);background:transparent;color:var(--text-secondary);font-family:Inter,sans-serif;font-size:12px;font-weight:500;cursor:pointer;transition:all var(--transition)}.btn-logout:hover{border-color:var(--danger);color:var(--danger);background:var(--danger-light)}