:root{--ink:#101828;--muted:#667085;--line:#e6e9ef;--canvas:#f6f7fa;--panel:#fff;--sidebar:#f1f3f7;--blue:#315efb;--blue-dark:#2448d8;--blue-soft:#edf2ff}*{box-sizing:border-box}html,body{width:100%;min-height:100%;margin:0}body{background:var(--canvas);color:var(--ink);-webkit-font-smoothing:antialiased;font-family:Arial,Microsoft YaHei,sans-serif}button,textarea,select{font:inherit}button,select{cursor:pointer}button:focus-visible,textarea:focus-visible,select:focus-visible{outline-offset:2px;outline:3px solid #315efb33}.app-shell{grid-template-columns:260px minmax(0,1fr);min-height:100vh;display:grid;overflow:hidden}.sidebar{background:var(--sidebar);border-right:1px solid #e2e5eb;flex-direction:column;height:100vh;padding:26px 18px 18px;display:flex}.brand{align-items:center;gap:10px;margin-bottom:28px;padding:0 9px;display:flex}.brand-mark{background:var(--blue);color:#fff;border-radius:9px 9px 9px 3px;place-items:center;width:30px;height:30px;font-size:15px;font-weight:800;display:grid;box-shadow:0 7px 16px #315efb33}.brand-name{letter-spacing:-.6px;font-size:20px;font-weight:750}.new-chat{color:#344054;background:#fff;border:1px solid #d9dce4;border-radius:11px;align-items:center;gap:9px;height:44px;padding:0 12px;font-size:14px;font-weight:600;transition:border-color .16s,box-shadow .16s;display:flex;box-shadow:0 2px 7px #10182808}.new-chat:hover{border-color:#bdc4d0;box-shadow:0 4px 12px #1018280f}.new-chat kbd{color:#98a2b3;background:0 0;border:0;margin-left:auto;font-size:10px;font-weight:500}.chat-history{margin-top:27px}.nav-label{color:#98a2b3;text-transform:uppercase;letter-spacing:.08em;margin:0 10px 9px;font-size:11px;font-weight:700}.history-item{color:#667085;text-align:left;background:0 0;border:0;border-radius:9px;align-items:center;gap:10px;width:100%;height:40px;padding:0 10px;font-size:13px;display:flex}.history-item:hover,.history-item.active{color:#344054;background:#e7eaf0}.history-icon{color:#98a2b3;font-size:15px}.sidebar-footer{border-top:1px solid #dfe3e9;margin-top:auto;padding-top:16px}.account-card{color:#98a2b3;text-align:left;background:0 0;border:0;align-items:center;gap:10px;width:100%;padding:7px;display:flex}.avatar{color:#536075;background:#dde3ef;border-radius:50%;place-items:center;width:34px;height:34px;font-size:13px;font-weight:700;display:grid}.account-copy{flex-direction:column;flex:1;gap:2px;display:flex}.account-copy strong{color:#344054;font-size:13px}.account-copy small{font-size:10px}.workspace{background:var(--panel);flex-direction:column;min-width:0;height:100vh;display:flex}.topbar{border-bottom:1px solid var(--line);z-index:3;background:#ffffffed;flex:0 0 65px;justify-content:space-between;align-items:center;height:65px;padding:0 26px;display:flex;position:relative}.model-select{align-items:center;display:flex;position:relative}.model-select select{appearance:none;color:#1d2939;background:0 0;border:0;padding:10px 25px 10px 19px;font-size:14px;font-weight:650}.status-dot{background:#12b76a;border-radius:50%;width:8px;height:8px;position:absolute;left:3px;box-shadow:0 0 0 3px #e7f8f0}.status-dot.checking,.connection-status.checking i{background:#f79009;box-shadow:0 0 0 3px #fff4e6}.status-dot.offline,.connection-status.offline i{background:#f04438;box-shadow:0 0 0 3px #feeceb}.chevron{color:#98a2b3;pointer-events:none;position:absolute;right:5px;transform:translateY(-1px)}.topbar-actions{align-items:center;gap:17px;display:flex}.connection-status{color:#667085;align-items:center;gap:6px;font-size:11px;display:flex}.connection-status i{background:#12b76a;border-radius:50%;width:6px;height:6px}.connection-status.offline{color:#b42318}.icon-button{color:#667085;background:0 0;border:0;border-radius:9px;width:34px;height:34px;font-size:16px}.icon-button:hover{background:#f2f4f7}.mobile-brand{display:none}.conversation{background:radial-gradient(circle at 50% 34%,#eff3ffb8,#0000 34%),#fff;flex:1;min-height:0;padding:48px 28px 176px;position:relative;overflow-y:auto}.welcome{text-align:center;flex-direction:column;justify-content:center;align-items:center;max-width:850px;min-height:calc(100vh - 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