:root{--bg: #0a0a0b;--surface: #111113;--surface2: #17171a;--border: #222226;--border2: #2e2e34;--text: #e8e8ec;--muted: #6b6b78;--muted2: #4a4a55;--accent: #7c6af7;--accent2: #5b4de0;--accent-glow: rgba(124, 106, 247, .15);--user-bg: #151520;--ai-bg: #111113;--green: #3ecf8e;--red: #f87171;--font-ui: "Syne", sans-serif;--font-mono:"DM Mono", monospace;--radius: 8px;--sidebar-w: 280px;--transition: .2s cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;overflow:hidden}body{font-family:var(--font-mono);background:var(--bg);color:var(--text);font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased}#app{display:flex;height:100vh;overflow:hidden}.sidebar{width:var(--sidebar-w);flex-shrink:0;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden;transition:transform var(--transition);z-index:10}.sidebar-header{padding:28px 24px 20px;border-bottom:1px solid var(--border)}.logo{display:flex;align-items:center;gap:10px;margin-bottom:4px}.logo-mark{width:28px;height:28px;background:var(--accent);border-radius:6px;display:flex;align-items:center;justify-content:center;font-family:var(--font-ui);font-weight:800;font-size:15px;color:#fff;flex-shrink:0}.logo-text{font-family:var(--font-ui);font-weight:800;font-size:17px;letter-spacing:.12em;color:var(--text)}.logo-sub{font-size:11px;color:var(--muted);letter-spacing:.02em}.new-chat-btn{margin:16px 16px 0;padding:9px 14px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius);font-family:var(--font-ui);font-weight:600;font-size:13px;cursor:pointer;display:flex;align-items:center;gap:8px;transition:background var(--transition),transform var(--transition);width:calc(100% - 32px);justify-content:center}.new-chat-btn:hover{background:var(--accent2);transform:translateY(-1px)}.new-chat-btn:active{transform:translateY(0)}.sidebar-section{padding:20px 20px 0}.sidebar-label{display:block;font-size:10px;font-weight:500;letter-spacing:.12em;color:var(--muted2);margin-bottom:8px;font-family:var(--font-ui)}.session-id{font-size:11px;color:var(--muted);word-break:break-all;line-height:1.5;background:var(--surface2);border:1px solid var(--border);border-radius:4px;padding:6px 8px}.system-prompt-input{width:100%;min-height:80px;max-height:160px;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);font-family:var(--font-mono);font-size:12px;line-height:1.5;padding:8px 10px;resize:vertical;transition:border-color var(--transition);outline:none}.system-prompt-input:focus{border-color:var(--accent)}.system-prompt-input::placeholder{color:var(--muted2)}.stats-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.stat{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius);padding:10px 12px;display:flex;flex-direction:column;gap:2px}.stat-value{font-family:var(--font-ui);font-weight:700;font-size:18px;color:var(--accent)}.stat-label{font-size:10px;color:var(--muted);letter-spacing:.04em}.sidebar-footer{margin-top:auto;padding:16px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:10px}.clear-btn{padding:8px 14px;background:transparent;border:1px solid var(--border2);border-radius:var(--radius);color:var(--muted);font-family:var(--font-mono);font-size:12px;cursor:pointer;transition:border-color var(--transition),color var(--transition);width:100%}.clear-btn:hover{border-color:var(--red);color:var(--red)}.model-badge{font-size:10px;color:var(--muted2);text-align:center;letter-spacing:.05em}.chat-area{flex:1;display:flex;flex-direction:column;overflow:hidden;background:var(--bg);position:relative}.chat-header{height:52px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 20px;flex-shrink:0;background:var(--bg)}.menu-btn{display:none;flex-direction:column;gap:4px;background:none;border:none;cursor:pointer;padding:4px}.menu-btn span{display:block;width:18px;height:1.5px;background:var(--muted);border-radius:2px}.header-status{display:flex;align-items:center;gap:7px;margin-left:auto}.status-dot{width:7px;height:7px;border-radius:50%;background:var(--green);transition:background var(--transition)}.status-dot.thinking{background:var(--accent);animation:pulse 1.2s ease-in-out infinite}.status-dot.error{background:var(--red)}@keyframes pulse{0%,to{opacity:1}50%{opacity:.3}}.status-text{font-size:12px;color:var(--muted);letter-spacing:.04em}.messages{flex:1;overflow-y:auto;padding:24px 0;scroll-behavior:smooth}.messages::-webkit-scrollbar{width:4px}.messages::-webkit-scrollbar-track{background:transparent}.messages::-webkit-scrollbar-thumb{background:var(--border2);border-radius:2px}.empty-state{max-width:560px;margin:60px auto;text-align:center;padding:0 24px;animation:fadeUp .5s ease forwards}.empty-icon{margin-bottom:20px;opacity:.5}.empty-state h2{font-family:var(--font-ui);font-weight:700;font-size:22px;margin-bottom:8px;color:var(--text)}.empty-state p{color:var(--muted);font-size:13px;margin-bottom:28px}.suggestions{display:grid;grid-template-columns:1fr 1fr;gap:8px}.suggestion{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--muted);font-family:var(--font-mono);font-size:12px;padding:10px 14px;cursor:pointer;text-align:left;line-height:1.4;transition:border-color var(--transition),color var(--transition),background var(--transition)}.suggestion:hover{border-color:var(--accent);color:var(--text);background:var(--accent-glow)}.message{max-width:780px;margin:0 auto 4px;padding:16px 24px;animation:fadeUp .25s ease forwards;display:flex;gap:16px;align-items:flex-start}@keyframes fadeUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.message.user{background:var(--user-bg);border-radius:12px;margin:8px auto;border:1px solid var(--border)}.message.assistant{background:transparent}.msg-avatar{width:28px;height:28px;border-radius:6px;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-family:var(--font-ui);font-weight:700;font-size:11px;letter-spacing:.03em}.message.user .msg-avatar{background:var(--border2);color:var(--muted)}.message.assistant .msg-avatar{background:var(--accent);color:#fff}.msg-content{flex:1;min-width:0;line-height:1.7;color:var(--text);font-size:14px}.msg-content p{margin-bottom:10px}.msg-content p:last-child{margin-bottom:0}.msg-content code{font-family:var(--font-mono);background:var(--surface2);border:1px solid var(--border);border-radius:4px;padding:1px 5px;font-size:13px;color:#a5d8ff}.msg-content pre{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;overflow-x:auto;margin:12px 0}.msg-content pre code{background:none;border:none;padding:0;color:var(--text);font-size:13px;line-height:1.6}.msg-content strong{color:var(--text);font-weight:600}.msg-content em{color:var(--muted)}.msg-content ul,.msg-content ol{padding-left:20px;margin:8px 0}.msg-content li{margin-bottom:4px}.msg-content h1,.msg-content h2,.msg-content h3{font-family:var(--font-ui);font-weight:700;margin:16px 0 8px;color:var(--text)}.msg-content h1{font-size:20px}.msg-content h2{font-size:17px}.msg-content h3{font-size:15px}.msg-content blockquote{border-left:2px solid var(--accent);padding-left:14px;color:var(--muted);margin:10px 0}.cursor{display:inline-block;width:2px;height:14px;background:var(--accent);margin-left:2px;vertical-align:middle;animation:blink .8s step-end infinite}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}.input-area{padding:16px 24px 20px;border-top:1px solid var(--border);background:var(--bg);flex-shrink:0}.input-wrapper{max-width:780px;margin:0 auto;position:relative;background:var(--surface);border:1px solid var(--border2);border-radius:12px;transition:border-color var(--transition),box-shadow var(--transition)}.input-wrapper:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}#messageInput{width:100%;background:transparent;border:none;color:var(--text);font-family:var(--font-mono);font-size:14px;line-height:1.6;padding:14px 52px 14px 16px;resize:none;outline:none;max-height:200px;overflow-y:auto}#messageInput::placeholder{color:var(--muted2)}.send-btn{position:absolute;right:10px;bottom:10px;width:32px;height:32px;background:var(--accent);border:none;border-radius:7px;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background var(--transition),transform var(--transition);flex-shrink:0}.send-btn:hover{background:var(--accent2);transform:translateY(-1px)}.send-btn:active{transform:translateY(0)}.send-btn:disabled{background:var(--border2);cursor:not-allowed;transform:none}.input-hint{max-width:780px;margin:6px auto 0;font-size:11px;color:var(--muted2);letter-spacing:.03em}@media (max-width: 768px){.sidebar{position:fixed;top:0;left:0;height:100%;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.menu-btn{display:flex}.suggestions{grid-template-columns:1fr}.message{padding:14px 16px}.input-area{padding:12px 16px 16px}}