:root{color-scheme:light;--bg: #f5f2ec;--panel: #fffdfa;--line: #dfd8cf;--text: #1d1a16;--muted: #7b7168;--soft: #eee8df;--accent: #176b5d;--accent-strong: #0f4f44;--assistant: #f0ebe2;--user: #176b5d;--shadow: 0 24px 80px rgba(32, 27, 20, .14)}*{box-sizing:border-box}html,body,#root{width:100%;height:100%;margin:0}body{font-family:ui-sans-serif,PingFang SC,Microsoft YaHei,Noto Sans SC,sans-serif;color:var(--text);background:linear-gradient(115deg,rgba(23,107,93,.12),transparent 36%),linear-gradient(245deg,rgba(194,98,52,.11),transparent 42%),var(--bg)}button,textarea{font:inherit}button{border:0}.chat-shell{width:min(980px,calc(100vw - 28px));height:calc(100dvh - 28px);margin:14px auto;display:grid;grid-template-rows:auto 1fr;overflow:hidden;border:1px solid var(--line);border-radius:18px;background:#fffdfae6;box-shadow:var(--shadow);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.chat-header{min-height:72px;padding:16px 18px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px}.chat-header h1,.empty-state h1{margin:0;font-size:22px;line-height:1.2;letter-spacing:0}.chat-header p,.empty-state p,.welcome p{margin:5px 0 0;color:var(--muted);font-size:13px}.icon-button{width:38px;height:38px;display:grid;place-items:center;border:1px solid var(--line);border-radius:10px;color:var(--muted);background:var(--panel);cursor:pointer}.icon-button:hover,.scroll-button:hover{color:var(--accent);border-color:#176b5d5c}.thread-root{min-height:0}.thread-viewport{height:100%;display:flex;flex-direction:column;align-items:stretch;overflow-y:auto;padding:20px 18px 14px;scroll-behavior:smooth}.welcome,.empty-state{align-self:center;margin:auto 0;width:min(520px,100%);text-align:center}.welcome h2{margin:0;font-size:28px;line-height:1.2;letter-spacing:0}.config-warning{margin-top:14px;color:#8a5a16}.message-row{width:100%;display:flex;align-items:flex-start;flex-shrink:0;margin:14px 0}.message-row.user{justify-content:flex-end}.message-row.assistant{justify-content:flex-start}.message-bubble{display:inline-block;width:fit-content;height:fit-content;max-width:min(760px,82%);border-radius:8px;padding:12px 14px;line-height:1.7;white-space:pre-wrap;word-break:break-word}.message-bubble>*{margin:0;min-height:0}.assistant .message-bubble{color:var(--text);background:var(--assistant)}.user .message-bubble{color:#fff;background:var(--user)}.scroll-button{position:sticky;bottom:102px;justify-self:center;width:34px;height:34px;display:grid;place-items:center;border:1px solid var(--line);border-radius:10px;color:var(--muted);background:var(--panel);box-shadow:0 10px 28px #201b141f;cursor:pointer}.composer-footer{position:sticky;bottom:0;flex-shrink:0;margin-top:auto;padding-top:12px;background:linear-gradient(180deg,transparent,var(--panel) 24%)}.composer{display:grid;gap:8px;border:1px solid var(--line);border-radius:14px;background:var(--panel);padding:10px}.model-select{width:min(260px,100%);height:34px;border:1px solid var(--line);border-radius:10px;padding:0 10px;color:var(--text);background:var(--soft)}.composer-main{display:grid;grid-template-columns:1fr auto;align-items:end;gap:10px}.composer-input{width:100%;max-height:190px;min-height:44px;resize:none;border:0;outline:none;padding:10px 8px;color:var(--text);background:transparent;line-height:1.55}.composer-actions{display:flex;align-items:center;gap:8px}.send-button{width:38px;height:38px;display:grid;place-items:center;border-radius:10px;color:#fff;background:var(--accent);cursor:pointer}.send-button:hover{background:var(--accent-strong)}.send-button:disabled{opacity:.45;cursor:not-allowed}@media (max-width: 720px){.chat-shell{width:100vw;height:100dvh;margin:0;border-width:0;border-radius:0}.chat-header{min-height:64px;padding:13px 14px}.thread-viewport{padding:14px 12px 10px}.message-bubble{max-width:88%}.model-select{width:100%}}