:root{--bg: #0b0b0e;--bg-sidebar: #0e0e12;--surface: #131318;--surface-hover: rgba(255, 255, 255, .045);--border: rgba(255, 255, 255, .08);--border-strong: rgba(255, 255, 255, .14);--text: #ececf1;--text-secondary: #b4b4bd;--muted: #7d7d89;--accent: #6e56cf;--danger: #e5484d;--font: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;--mono: "JetBrains Mono", ui-monospace, "SF Mono", monospace}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}body{font-family:var(--font);background:var(--bg);color:var(--text);overflow:hidden;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}#app{display:flex;height:100dvh}.btn{display:inline-flex;align-items:center;gap:8px;font:500 13px/1 var(--font);border:none;border-radius:8px;padding:8px 10px;cursor:pointer;color:var(--text-secondary);background:transparent;transition:background .12s ease,color .12s ease,border-color .12s ease}.btn-ghost:hover{background:var(--surface-hover);color:var(--text)}.btn-new{justify-content:flex-start;width:100%;padding:9px 12px;color:var(--text);border:1px solid var(--border);background:transparent}.btn-new:hover{background:var(--surface-hover);border-color:var(--border-strong)}.icon-only{padding:7px;display:none}#sidebar{width:260px;min-width:260px;background:var(--bg-sidebar);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:14px 12px;gap:14px;z-index:30}.brand{display:flex;align-items:center;gap:10px;padding:4px 6px 2px}.logo{width:26px;height:26px;border-radius:7px;background:var(--text);color:var(--bg);display:grid;place-items:center;font:700 14px var(--font)}.wordmark{font-size:14.5px;font-weight:600;letter-spacing:-.01em}#chat-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:2px;margin:0 -4px;padding:0 4px}.chat-item{display:flex;align-items:center;border-radius:8px;transition:background .12s ease}.chat-item:hover{background:var(--surface-hover)}.chat-item.active{background:#ffffff12}.chat-title{flex:1;min-width:0;text-align:left;background:none;border:none;color:var(--text-secondary);font:400 13px var(--font);padding:8px 10px;cursor:pointer;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-item.active .chat-title{color:var(--text)}.chat-del{background:none;border:none;color:transparent;font-size:11px;padding:8px 10px;cursor:pointer}.chat-item:hover .chat-del{color:var(--muted)}.chat-del:hover{color:var(--text)!important}#backdrop{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:25}#backdrop.show{display:block}#panel{flex:1;display:flex;flex-direction:column;min-width:0}#topbar{display:flex;align-items:center;gap:10px;padding:10px 16px;min-height:52px}.model-tag{font:600 13.5px var(--font);letter-spacing:-.01em;color:var(--text);padding:7px 10px}.model-badge{font-size:11.5px;color:var(--muted);padding:4px 9px;border:1px solid var(--border);border-radius:999px}#chat-area{flex:1;overflow-y:auto;padding:24px 20px 8px}#messages{max-width:720px;margin:0 auto}.msg{margin-bottom:28px;display:flex;flex-direction:column}.msg.user{align-items:flex-end}.msg.assistant{align-items:stretch}.msg-meta{font-size:12px;font-weight:600;color:var(--muted);margin-bottom:8px;letter-spacing:-.01em}.msg.user .bubble{max-width:75%;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:10px 14px;font-size:14.5px;line-height:1.6;white-space:pre-wrap;word-wrap:break-word}.msg.assistant .bubble{font-size:15px;line-height:1.7;color:var(--text);word-wrap:break-word;overflow-wrap:break-word}.bubble h3{margin:14px 0 6px;font-size:15px;font-weight:600;letter-spacing:-.01em}.bubble li{margin:0 0 4px 22px;display:list-item;list-style:disc}.bubble li.num{list-style:decimal}.bubble a{color:var(--text);text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--muted)}.bubble a:hover{text-decoration-color:var(--text)}.bubble blockquote{border-left:2px solid var(--border-strong);padding:2px 0 2px 14px;margin:10px 0;color:var(--text-secondary)}.bubble code{font-family:var(--mono);font-size:12.5px;background:var(--surface);border:1px solid var(--border);padding:1.5px 5px;border-radius:5px}.bubble pre{background:#0e0e13;border:1px solid var(--border);border-radius:10px;margin:12px 0;overflow:hidden}.bubble pre .lang{font:500 11px var(--mono);color:var(--muted);padding:7px 14px;border-bottom:1px solid var(--border)}.bubble pre code{display:block;background:none;border:none;padding:13px 14px;overflow-x:auto;white-space:pre;font-size:13px;line-height:1.6}.dots{display:inline-flex;gap:4px;padding:6px 0}.dots span{width:5px;height:5px;border-radius:50%;background:var(--muted);animation:pulse 1.2s ease-in-out infinite}.dots span:nth-child(2){animation-delay:.15s}.dots span:nth-child(3){animation-delay:.3s}@keyframes pulse{0%,60%,to{opacity:.3}30%{opacity:1}}#welcome{height:100%;display:flex;align-items:center;justify-content:center;padding:20px}.welcome-inner{width:100%;max-width:560px;text-align:center}#welcome h2{font-size:24px;font-weight:600;letter-spacing:-.02em}#welcome p{color:var(--muted);font-size:14px;margin-top:8px}.chips{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:28px}.chip{background:transparent;border:1px solid var(--border);color:var(--text-secondary);font:400 13px/1.45 var(--font);padding:12px 14px;border-radius:10px;cursor:pointer;text-align:left;transition:background .12s ease,border-color .12s ease,color .12s ease}.chip:hover{background:var(--surface-hover);border-color:var(--border-strong);color:var(--text)}#composer-wrap{padding:8px 20px 0}#composer{display:flex;align-items:flex-end;gap:8px;max-width:720px;margin:0 auto;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:9px 9px 9px 6px;transition:border-color .15s ease}#composer:focus-within{border-color:var(--border-strong)}#input{flex:1;background:none;border:none;outline:none;resize:none;color:var(--text);font:400 14.5px/1.55 var(--font);max-height:200px;padding:5px 10px}#input::placeholder{color:var(--muted)}#send{width:30px;height:30px;border:none;border-radius:9px;background:var(--text);color:var(--bg);cursor:pointer;display:grid;place-items:center;flex-shrink:0;transition:opacity .12s ease,background .12s ease}#send:hover{background:#fff}#send .ic-stop,#send.busy .ic-send{display:none}#send.busy .ic-stop{display:block}#send.busy{background:var(--surface);color:var(--text);border:1px solid var(--border-strong)}.disclaimer{text-align:center;font-size:11px;color:var(--muted);padding:8px 16px 10px}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-thumb{background:#ffffff1f;border-radius:99px}::-webkit-scrollbar-thumb:hover{background:#fff3}::-webkit-scrollbar-track{background:transparent}@media (max-width: 820px){.icon-only{display:inline-flex}#sidebar{position:fixed;left:0;top:0;bottom:0;transform:translate(-100%);transition:transform .2s ease}#sidebar.open{transform:translate(0)}.msg.user .bubble{max-width:90%}.chips{grid-template-columns:1fr}#chat-area{padding:18px 14px 6px}#composer-wrap{padding:6px 14px 0}}