:root{color:#161616;background:#f7f7f3;font-family:Inter,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button,input,textarea{font:inherit}button{border:0;cursor:pointer}.login-screen{min-height:100vh;display:grid;place-items:center;padding:20px;background:linear-gradient(160deg,#f7f7f3,#e7f0ee 55%,#f5e8d8)}.login-panel{width:min(100%,420px);padding:28px;border:1px solid #dedbd3;border-radius:8px;background:#ffffffdb;box-shadow:0 24px 70px #22272324}.brand-row,.history-header,.topbar,.url-bar,.action-row,.modal-actions{display:flex;align-items:center}.brand-row{gap:10px;font-weight:800}.brand-mark{width:38px;height:38px;display:grid;place-items:center;color:#fff;border-radius:8px;background:#176b5b}.login-panel h1{margin:24px 0 10px;font-size:34px;line-height:1.12}.login-panel p{color:#555c57;line-height:1.7}.login-form{display:grid;gap:12px;margin-top:22px}.login-form input,.token-field input,.url-bar input,.composer textarea{width:100%;border:1px solid #d8d4ca;border-radius:8px;color:#161616;background:#fff;outline:none}.login-form input{height:48px;padding:0 14px}.login-form button,.new-chat,.composer button,.url-bar button,.modal-actions button{color:#fff;background:#176b5b;border-radius:8px;font-weight:700}.login-form button{height:48px}.login-form button[type=button]{color:#24302c;background:#eee9df}.app-shell{min-height:100vh;display:grid;background:#f7f7f3}.history{display:none}.chat-pane{min-width:0;min-height:100vh;display:grid;grid-template-rows:auto auto auto auto auto 1fr auto auto;gap:12px;padding:14px}.topbar{justify-content:space-between;padding:8px 2px}.eyebrow{display:block;color:#176b5b;font-size:12px;font-weight:800}.topbar h2{margin:2px 0 0;font-size:22px}.quick-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.quick-grid button,.action-row button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px;border:1px solid #d8d4ca;border-radius:8px;color:#24302c;background:#fff;font-weight:700}.url-bar{gap:8px;padding:8px;border:1px solid #d8d4ca;border-radius:8px;background:#fff}.url-bar input{height:38px;padding:0 8px;border:0}.url-bar button{height:38px;padding:0 14px}.token-field{display:grid;gap:6px;color:#555c57;font-size:12px;font-weight:700}.token-field input{height:42px;padding:0 12px}.messages{overflow:auto;display:flex;flex-direction:column;gap:10px;padding:4px 0 12px}.message{max-width:88%;padding:12px 14px;border-radius:8px;line-height:1.65;white-space:pre-wrap}.message.user{align-self:flex-end;color:#fff;background:#176b5b}.message.assistant,.message.system{align-self:flex-start;border:1px solid #e0ddd6;background:#fff}.empty-state{margin:auto;max-width:360px;text-align:center;color:#555c57}.empty-state h3{margin:10px 0 4px;color:#161616}.action-row{gap:8px;overflow-x:auto}.action-row button{flex:1 0 auto}.composer{display:grid;grid-template-columns:1fr 52px;gap:10px;align-items:end}.composer-input{min-width:0}.composer textarea{min-height:70px;max-height:160px;resize:vertical;padding:12px;line-height:1.6}.composer-actions{display:grid;gap:8px}.composer button,.file-button{height:52px;display:grid;place-items:center}.file-button{border:1px solid #d8d4ca;border-radius:8px;color:#24302c;background:#fff;cursor:pointer}.file-button input{display:none}.attachment-list{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}.attachment-list span{max-width:100%;overflow:hidden;padding:5px 8px;border:1px solid #d8d4ca;border-radius:8px;color:#555c57;background:#fff;font-size:12px;text-overflow:ellipsis;white-space:nowrap}.composer button:disabled,.url-bar button:disabled{cursor:not-allowed;opacity:.55}.markdown-content{display:grid;gap:8px}.markdown-content p,.markdown-content figure,.markdown-content ul,.markdown-content h3,.markdown-content h4,.markdown-content h5{margin:0}.markdown-content ul{padding-left:20px}.markdown-content a{color:#176b5b;font-weight:700}.markdown-content img{max-width:100%;border-radius:8px}.markdown-content :not(pre)>code{padding:2px 5px;border-radius:5px;background:#eee9df}.code-block{overflow:hidden;border:1px solid #d8d4ca;border-radius:8px;background:#1f2522}.code-block figcaption{padding:6px 10px;color:#dce6e0;border-bottom:1px solid rgba(255,255,255,.12);font-size:12px}.code-block pre{overflow:auto;margin:0;padding:12px;color:#f4f7f5;line-height:1.5}.alert,.success{padding:10px 12px;border-radius:8px;line-height:1.5}.alert{color:#8f1f1f;background:#fff0ed;border:1px solid #ffd0c7}.success{color:#176b5b;background:#eefaf5;border:1px solid #c6eadc}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;padding:18px;background:#1418167a}.modal{width:min(100%,380px);padding:22px;border-radius:8px;background:#fff}.modal h3{margin:12px 0 8px}.modal p{overflow-wrap:anywhere;color:#555c57}.modal-actions{justify-content:flex-end;gap:10px;margin-top:18px}.modal-actions button{min-height:42px;padding:0 16px;color:#24302c;background:#eee9df}.modal-actions .danger{color:#fff;background:#a93434}.spin{animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (min-width: 860px){.app-shell{grid-template-columns:290px 1fr}.history{min-height:100vh;display:flex;flex-direction:column;gap:12px;padding:16px;border-right:1px solid #dedbd3;background:#fff}.history-header{justify-content:space-between;gap:10px}.history-header small{display:block;max-width:190px;overflow:hidden;color:#68716c;text-overflow:ellipsis}.icon-button{width:38px;height:38px;display:grid;place-items:center;border-radius:8px;color:#24302c;background:#eee9df}.new-chat{min-height:42px}.chat-list{display:grid;gap:6px;overflow:auto}.chat-item{min-height:42px;display:flex;align-items:center;gap:8px;padding:0 10px;border-radius:8px;color:#24302c;background:transparent;text-align:left}.chat-item span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-item.active{background:#eef4f1;color:#176b5b;font-weight:800}.chat-pane{max-width:920px;width:100%;margin:0 auto;padding:24px}}