:root{color-scheme:light;--bg: #ffffff;--surface: #f7f9fc;--surface-2: #f1f5f9;--card: #ffffff;--ink: #0f172a;--ink-2: #1f2937;--muted: #64748b;--faint: #94a3b8;--line: #e2e8f0;--line-strong: #cbd5e1;--primary: #111827;--primary-hover: #020617;--accent: #2563eb;--danger: #b91c1c;--star: #f59e0b;--shadow: 0 18px 45px rgba(15, 23, 42, .08);--radius: 10px;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}html,body{height:100%}*{box-sizing:border-box}body{min-width:320px;height:100vh;margin:0;overflow:hidden;background:var(--bg);color:var(--ink);font-size:14px;line-height:1.45;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}html.help-page-root,html.help-page-root body,body.help-page-body{height:auto;min-height:100vh;overflow-x:hidden;overflow-y:auto}#helpApp{min-height:100vh}button,textarea,input,select{font:inherit}button{border:0;color:inherit;cursor:pointer}button:disabled{cursor:not-allowed;opacity:.6}*{scrollbar-width:thin;scrollbar-color:#cbd5e1 transparent}*::-webkit-scrollbar{width:8px;height:8px}*::-webkit-scrollbar-track{background:transparent}*::-webkit-scrollbar-thumb{background:#cbd5e1;border:2px solid transparent;border-radius:999px;background-clip:padding-box}*::-webkit-scrollbar-thumb:hover{background:#94a3b8;border:2px solid transparent;background-clip:padding-box}.app-shell{display:grid;grid-template-columns:280px minmax(0,1fr);height:100vh;min-height:0;background:var(--bg);overflow:hidden}.sidebar{display:flex;height:100vh;min-width:0;min-height:0;flex-direction:column;background:linear-gradient(180deg,#f8fafc,#f3f6fb);border-right:1px solid var(--line)}.sidebar-header,.topbar{flex:0 0 72px;height:72px;border-bottom:1px solid var(--line)}.sidebar-header{display:flex;align-items:center;justify-content:flex-start;padding:0 18px}.icon-button{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}.icon-button:hover,.settings-button:hover,.history-item:hover,.model-select:hover,.new-chat-button:hover,.secondary-button:hover{border-color:var(--line-strong);background:#fff}.history-list{display:flex;flex:1;flex-direction:column;gap:6px;min-height:0;padding:12px;overflow-y:auto}.empty-history{display:grid;place-items:center;min-height:120px;color:#94a3b8;font-size:13px;font-weight:650}.history-item{display:grid;grid-template-columns:22px minmax(0,1fr) auto;gap:12px;align-items:center;width:100%;min-height:56px;padding:9px 10px;text-align:left;background:transparent;border:1px solid transparent;border-radius:var(--radius)}.history-item.active{background:#fff;border-color:var(--line);box-shadow:0 8px 22px #0f172a0d}.history-item>.icon{color:#8aa0bd}.history-copy{display:grid;gap:5px;min-width:0}.history-copy strong{overflow:hidden;color:#0f172a;font-size:13px;font-weight:700;line-height:1.25;text-overflow:ellipsis;white-space:nowrap}.history-copy span{color:#8aa0bd;font-size:12px;font-weight:640}.history-actions{display:inline-flex;gap:4px;justify-content:center}.history-action{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;color:#b6c3d4;border-radius:7px}.history-action:hover{background:#f1f5f9;color:#64748b}.delete-action:hover{color:var(--danger)}.star-icon{width:18px;height:18px}.star-icon.starred{color:var(--star)}.sidebar-footer{padding:14px;border-top:1px solid var(--line)}.settings-button{display:inline-flex;align-items:center;justify-content:center;gap:10px;width:100%;height:42px;background:#fff;border:1px solid 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