:root{--bg:#f5f7fb;--panel:#fff;--border:#e5e8ef;--text:#1f2329;--text-2:#3b3f45;--text-3:#646a73;--text-4:#8f959e;--placeholder:#a8aeb8;--accent:#2563eb;--accent-hover:#1d4fd8;--accent-weak:#eef3fe;--accent-text:#2563eb;--green:#0e9f6e;--green-weak:#eaf7f0;--orange:#d97b06;--orange-weak:#fdf3e7;--purple:#6d4ae0;--purple-weak:#f1edfd;--shadow:0 8px 24px -4px #26386b0f}[data-theme=dark]{--bg:#14161c;--panel:#1d212a;--border:#2b303b;--text:#e8eaed;--text-2:#c6cad1;--text-3:#9aa1aa;--text-4:#7b828c;--placeholder:#6c737d;--accent:#2563eb;--accent-hover:#3b82f6;--accent-weak:#1c2a45;--accent-text:#7fa8fa;--green:#3dcc91;--green-weak:#143028;--orange:#f0a63c;--orange-weak:#332611;--purple:#a78bfa;--purple-weak:#251e3e;--shadow:0 8px 24px -4px #0006}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Noto Sans SC,sans-serif;transition:background .2s,color .2s}button{cursor:pointer;color:inherit;background:0 0;border:none;font-family:inherit}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.ai-sidebar{background:var(--panel);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;gap:12px;width:264px;padding:16px;transition:background .2s;display:flex}.logo-row{align-items:center;gap:10px;padding:4px 4px 8px;display:flex}.logo-icon{background:var(--accent);border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;display:flex}.logo-text{color:var(--text);font-size:17px;font-weight:700}.new-chat-btn{background:var(--accent);color:#fff;border-radius:10px;justify-content:center;align-items:center;gap:6px;width:100%;height:40px;font-size:14px;font-weight:500;transition:background .15s;display:flex}.new-chat-btn:hover{background:var(--accent-hover)}.section-label{color:var(--text-4);padding:4px 4px 0;font-size:12px}.conv-list{flex-direction:column;gap:2px;min-height:0;list-style:none;display:flex;overflow-y:auto}.conv-empty{color:var(--text-4);padding:8px 10px;font-size:12px}.conv-item{color:var(--text-2);cursor:pointer;white-space:nowrap;border-radius:8px;align-items:center;gap:8px;padding:9px 10px;font-size:13px;display:flex;overflow:hidden}.conv-item:hover{background:var(--accent-weak)}.conv-item.active{background:var(--accent-weak);color:var(--accent-text);font-weight:500}.conv-title{text-overflow:ellipsis;overflow:hidden}.spacer{flex:1}.user-card{background:var(--bg);border-radius:10px;align-items:center;gap:10px;padding:8px;display:flex}.user-info{min-width:0}.user-name{color:var(--text);font-size:13px;font-weight:500}.user-plan{color:var(--text-4);font-size:11px}.chat-scroll{flex:1;min-height:0;overflow-y:auto}.chat-col{flex-direction:column;gap:20px;max-width:920px;margin:0 auto;padding:16px 48px 8px;display:flex}.msg-row{gap:10px;display:flex}.msg-row.user{justify-content:flex-end}.user-bubble{background:var(--accent);color:#fff;white-space:pre-wrap;word-break:break-word;border-radius:12px;max-width:70%;padding:10px 16px;font-size:14px;line-height:1.7}.ai-card{background:var(--panel);border:1px solid var(--border);max-width:820px;color:var(--text-2);white-space:pre-wrap;word-break:break-word;border-radius:12px;padding:18px;font-size:14px;line-height:1.8}.ai-card.error{border-color:var(--orange);color:var(--orange)}.ai-avatar{background:var(--accent);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;display:flex}.sources-row{flex-wrap:wrap;gap:8px;margin-top:10px;display:flex}.source-chip{background:var(--accent-weak);color:var(--accent-text);white-space:pre-wrap;border-radius:6px;align-items:center;gap:5px;padding:5px 8px;font-size:12px;display:inline-flex}.source-chip.purple{background:var(--purple-weak);color:var(--purple)}.cursor-blink{color:var(--accent-text);animation:1s step-end infinite blink}@keyframes blink{50%{opacity:0}}.empty-tip{color:var(--text-4);font-size:13px}.composer-zone{flex-direction:column;align-items:center;gap:12px;padding:12px 32px 20px;display:flex}.cap-grid{grid-template-columns:repeat(2,minmax(0,572px));gap:16px;margin-bottom:16px;display:grid}@media (width<=1280px){.cap-grid{grid-template-columns:1fr;width:100%;max-width:640px}}.cap-card{text-align:left;background:var(--panel);border:1px solid var(--border);border-radius:12px;align-items:center;gap:14px;padding:20px;transition:border-color .15s,box-shadow .15s;display:flex}.cap-card:hover{border-color:var(--accent);box-shadow:var(--shadow)}.cap-icon{border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;display:flex}.tint-blue{background:var(--accent-weak);color:var(--accent-text)}.tint-green{background:var(--green-weak);color:var(--green)}.tint-orange{background:var(--orange-weak);color:var(--orange)}.tint-purple{background:var(--purple-weak);color:var(--purple)}.cap-text{flex-direction:column;gap:4px;min-width:0;display:flex}.cap-text strong{color:var(--text);font-size:15px;font-weight:500}.cap-text span{color:var(--text-3);font-size:13px}.input-bar{background:var(--panel);border:1px solid var(--border);width:min(760px,100%);box-shadow:var(--shadow);border-radius:16px;align-items:flex-end;gap:12px;padding:12px 12px 12px 16px;display:flex}.input-bar textarea{resize:none;color:var(--text);background:0 0;border:none;outline:none;flex:1;max-height:120px;font-family:inherit;font-size:14px;line-height:1.6}.input-bar textarea::placeholder{color:var(--placeholder)}.attach-icon{flex-shrink:0;margin-bottom:4px}.send-btn{background:var(--accent);border-radius:18px;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;transition:background .15s,opacity .15s;display:flex}.send-btn:hover{background:var(--accent-hover)}.send-btn:disabled{opacity:.5;cursor:not-allowed}.composer-hint{color:var(--placeholder);font-size:12px}.chat-layout{height:100vh;display:flex;overflow:hidden}.chat-main{flex-direction:column;flex:1;min-width:0;display:flex}.chat-topbar{justify-content:space-between;align-items:center;padding:20px 32px;display:flex}.chat-title{color:var(--text);font-size:18px;font-weight:600}.topbar-right{align-items:center;gap:12px;display:flex}.model-chip{background:var(--panel);border:1px solid var(--border);height:32px;color:var(--text-2);border-radius:16px;align-items:center;gap:6px;padding:0 12px;font-size:12px;display:flex}.icon-btn{background:var(--panel);border:1px solid var(--border);width:32px;height:32px;color:var(--text-3);border-radius:16px;justify-content:center;align-items:center;transition:color .15s,border-color .15s;display:flex}.icon-btn:hover{color:var(--accent-text);border-color:var(--accent)}.avatar{background:var(--accent);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;display:flex}