:root{--brand:#153283;--brand-soft:#e9edf8;--brand-dark:#0e2361;--accent-red:#e30613;--bg:#f5f7fb;--surface:#fff;--border:#e2e7f1;--text:#171b26;--muted:#6a7288;--in-bg:#f1f3f9;--out-bg:#153283;--green:#1a9e5c;--amber:#b9770b;--radius:10px}*{box-sizing:border-box;margin:0;padding:0}body,html{height:100%}body{font-family:system-ui,-apple-system,Segoe UI,Helvetica,Arial,sans-serif;font-size:14.5px;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{cursor:pointer}button,input,textarea{font-family:inherit}.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#eef3ff,#f5f7fb);padding:24px}.login-card{width:100%;max-width:360px;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:36px 32px;box-shadow:0 12px 40px rgba(20,40,90,.08);display:flex;flex-direction:column;gap:14px}.login-logo{width:190px;max-width:72%;height:auto;display:block;margin:0 auto 4px}.login-title{font-size:22px;font-weight:700}.login-sub,.login-title{text-align:center}.login-sub{font-size:13.5px;color:var(--muted);margin-bottom:6px}.login-input{padding:12px 14px;border:1px solid var(--border);border-radius:8px;font-size:15px;outline:none}.login-input:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}.login-btn{padding:12px;background:var(--brand);color:#fff;border:none;border-radius:8px;font-size:15px;font-weight:600}.login-btn:disabled{opacity:.6}.login-err{color:#c0392b;font-size:13px}.shell{display:flex;height:100vh;overflow:hidden}.sidebar{width:220px;flex-shrink:0;background:var(--surface);border-right:1px solid var(--border);padding:20px 14px}.sidebar,.sidebar-brand{display:flex;flex-direction:column}.sidebar-brand{align-items:flex-start;gap:8px;padding:2px 4px 18px;border-bottom:1px solid var(--border);margin-bottom:14px}.sidebar-logo-img{width:100%;max-width:168px;height:auto;display:block}.sidebar-sub{font-size:11px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);padding-left:2px}.nav-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:8px;color:var(--muted);font-weight:600;font-size:14px;margin-bottom:4px}.nav-item:hover{background:var(--bg);color:var(--text)}.nav-item.active{background:var(--brand-soft);color:var(--brand)}.nav-spacer{flex:1 1}.nav-foot{font-size:11px;color:var(--muted);padding:8px 12px}.content{flex:1 1;min-width:0;display:flex;flex-direction:column;overflow:hidden}.inbox{display:flex;height:100%}.conv-list{width:320px;flex-shrink:0;border-right:1px solid var(--border);background:var(--surface);overflow-y:auto}.conv-list-head{padding:16px 18px;font-weight:700;font-size:16px;position:-webkit-sticky;position:sticky;top:0;background:var(--surface);z-index:1}.conv-list-head,.conv-row{border-bottom:1px solid var(--border)}.conv-row{padding:13px 18px;cursor:pointer;display:flex;flex-direction:column;gap:3px}.conv-row:hover{background:var(--bg)}.conv-row.active{background:var(--brand-soft)}.conv-row-top{display:flex;justify-content:space-between;align-items:baseline;gap:8px}.conv-name{font-weight:600;font-size:14px}.conv-time{font-size:11px;color:var(--muted);flex-shrink:0}.conv-preview{font-size:12.5px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conv-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.conv-dot.open{background:var(--green)}.conv-dot.other{background:#c4cbda}.chat{flex:1 1;min-width:0;display:flex;flex-direction:column;background:var(--bg)}.chat-head{padding:15px 22px;border-bottom:1px solid var(--border);background:var(--surface);font-weight:700}.chat-head small{display:block;font-weight:500;font-size:12px;color:var(--muted)}.chat-body{flex:1 1;overflow-y:auto;padding:22px;display:flex;flex-direction:column;gap:10px}.bubble{max-width:72%;padding:10px 14px;border-radius:12px;font-size:14px;line-height:1.5;white-space:pre-wrap;word-wrap:break-word}.bubble.in{align-self:flex-start;background:var(--surface);border:1px solid var(--border);border-bottom-left-radius:4px}.bubble.out{align-self:flex-end;background:var(--out-bg);color:#fff;border-bottom-right-radius:4px}.bubble.note{align-self:center;background:#fff4ce;color:#6b5300;border:1px solid #f0d98a;font-size:12.5px;max-width:86%}.bubble-time{display:block;font-size:10.5px;opacity:.6;margin-top:4px}.chat-input{display:flex;gap:10px;padding:14px 18px;border-top:1px solid var(--border);background:var(--surface)}.chat-input textarea{flex:1 1;resize:none;border:1px solid var(--border);border-radius:8px;padding:10px 12px;font-size:14px;outline:none;max-height:120px}.chat-input textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}.chat-send{padding:0 20px;background:var(--brand);color:#fff;border:none;border-radius:8px;font-weight:600}.chat-send:disabled{opacity:.5}.empty{flex:1 1;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:14px}.asst{display:flex;flex-direction:column;height:100%;background:var(--bg)}.asst-head{padding:16px 24px;border-bottom:1px solid var(--border);background:var(--surface)}.asst-head h1{font-size:18px}.asst-head p{font-size:12.5px;color:var(--muted)}.asst-body{flex:1 1;overflow-y:auto;padding:24px;gap:14px;max-width:860px;width:100%;margin:0 auto}.asst-body,.msg{display:flex;flex-direction:column}.msg{gap:4px}.msg-role{font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}.msg.user .msg-role{color:var(--brand)}.msg-text{font-size:14.5px;line-height:1.6;white-space:pre-wrap;word-wrap:break-word}.msg.assistant .msg-text{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:14px 16px}.tool-chip{align-self:flex-start;font-size:11.5px;font-family:ui-monospace,monospace;background:var(--brand-soft);color:var(--brand);padding:3px 9px;border-radius:6px;margin:2px 0}.asst-suggest{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}.asst-suggest button{font-size:12.5px;background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:6px 14px;color:var(--muted)}.asst-suggest button:hover{border-color:var(--brand);color:var(--brand)}.asst-input{display:flex;gap:10px;padding:16px 24px;border-top:1px solid var(--border);background:var(--surface);max-width:860px;width:100%;margin:0 auto}.asst-input textarea{flex:1 1;resize:none;border:1px solid var(--border);border-radius:8px;padding:11px 13px;font-size:14.5px;outline:none;max-height:140px}.asst-input textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}.asst-send{padding:0 22px;background:var(--brand);color:#fff;border:none;border-radius:8px;font-weight:600}.asst-send:disabled{opacity:.5}.spin{display:inline-block;width:14px;height:14px;border:2px solid var(--border);border-top-color:var(--brand);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}