:root{--bg:#f6f7fb;--panel:#ffffff;--border:#e6e8f0;--text:#0f172a;--muted:#64748b;--brand:#2563eb;--brand2:#1d4ed8;--shadow:0 10px 30px rgba(15,23,42,.08)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;background:var(--bg);color:var(--text)}.layout{display:flex;height:100%}.sidebar{width:320px;background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column}.sidebar.closed{width:0;overflow:hidden;border-right:none}.sidebarTop{display:flex;align-items:center;gap:10px;padding:14px 12px;border-bottom:1px solid var(--border)}.brand{font-weight:800}.threadList{padding:10px;overflow:auto}.threadItem{width:100%;text-align:left;border:1px solid var(--border);background:#fff;border-radius:14px;padding:10px 12px;margin-bottom:10px;cursor:pointer;box-shadow:0 2px 12px #0f172a0d}.threadItem.active{border-color:#2563eb59}.threadTitle{font-weight:700}.threadMeta{font-size:12px;color:var(--muted);margin-top:2px}.main{flex:1;display:flex;flex-direction:column}.topbar{height:56px;display:flex;align-items:center;padding:0 14px;border-bottom:1px solid var(--border);background:#fffc;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.topTitle{font-weight:800}.spacer{flex:1}.chat{flex:1;overflow:auto;padding:18px;display:flex;flex-direction:column;gap:14px}.empty{margin:auto;text-align:center;max-width:520px}.emptyTitle{font-size:38px;font-weight:900;letter-spacing:-.02em;margin-bottom:8px}.bubbleRow{display:flex}.bubbleRow.left{justify-content:flex-start}.bubbleRow.right{justify-content:flex-end}.bubble{max-width:min(760px,92%);border-radius:18px;padding:12px 14px;box-shadow:0 2px 16px #0f172a0f;border:1px solid var(--border)}.bubble.user{background:#eaf2ff;border-color:#2563eb40}.bubble.assistant{background:#fff}.bubbleText{white-space:pre-wrap;line-height:1.35}.bubbleMeta{margin-top:8px;font-size:12px;color:var(--muted)}.composer{border-top:1px solid var(--border);background:#ffffffe6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding:12px;display:flex;gap:12px;align-items:flex-end}.textarea{flex:1;resize:none;min-height:46px;max-height:160px;border:1px solid var(--border);border-radius:14px;padding:12px;outline:none;font-size:14px}.textarea:focus{border-color:#2563eb59;box-shadow:0 0 0 4px #2563eb1f}.btnPrimary,.btnSecondary{border:none;border-radius:14px;padding:12px 14px;font-weight:800;cursor:pointer}.btnPrimary{background:var(--brand);color:#fff}.btnPrimary:hover{background:var(--brand2)}.btnPrimary:disabled{opacity:.55;cursor:not-allowed}.btnSecondary{background:#eef2ff;color:#1e3a8a}.btnSecondary:hover{background:#e0e7ff}.full{width:calc(100% - 20px);margin:10px}.iconBtn{border:none;background:transparent;font-size:18px;cursor:pointer;padding:8px;border-radius:10px}.iconBtn:hover{background:#f1f5f9}.muted{color:var(--muted)}.pad{padding:10px}.errorBar{margin:10px 12px 0;border:1px solid #fecaca;background:#fff1f2;color:#991b1b;border-radius:14px;padding:10px 12px}.modalOverlay{position:fixed;inset:0;background:#0f172a73;display:flex;align-items:center;justify-content:center;padding:18px;z-index:50}.modalCard{width:min(520px,96vw);background:#fff;border-radius:18px;border:1px solid var(--border);box-shadow:var(--shadow);padding:14px}.modalHeader{display:flex;align-items:center;gap:10px;margin-bottom:10px}.modalTitle{font-weight:900;font-size:18px;flex:1}.label{display:block;margin-top:12px;font-size:12px;color:var(--muted);font-weight:700}.input{width:100%;border:1px solid var(--border);border-radius:14px;padding:12px;outline:none}.input:focus{border-color:#2563eb59;box-shadow:0 0 0 4px #2563eb1f}.row{display:flex}.divider{height:1px;background:var(--border);margin-top:14px}.errorBox{margin-top:12px;border:1px solid #fecaca;background:#fff1f2;color:#991b1b;border-radius:14px;padding:10px 12px}.mobileOnly{display:none}@media(max-width:900px){.sidebar{position:fixed;inset:0 auto 0 0;z-index:20;transform:translate(0);transition:transform .18s ease}.sidebar.closed{transform:translate(-110%);width:320px;border-right:1px solid var(--border)}.mobileOnly{display:inline-flex}}