:root{color-scheme:light;--bg: #ffffff;--bg-elevated: #ffffff;--bg-sidebar: #f9f9f9;--bg-hover: rgba(13, 13, 13, .05);--bg-user: #f4f4f4;--bg-assistant: transparent;--surface-glass: rgba(255, 255, 255, .72);--surface-glass-strong: #ffffff;--surface-solid: #ffffff;--surface-sunken: rgba(13, 13, 13, .05);--surface-sunken-soft: rgba(13, 13, 13, .02);--surface-code: #f7f7f8;--surface-code-inline: #ededed;--code-keyword: #8250df;--code-string: #0a6b45;--code-number: #b5541a;--code-title: #1f4b99;--code-type: #7a4a12;--surface-code-btn: rgba(255, 255, 255, .92);--surface-doc: #f7f7f8;--surface-doc-alt: #f4f4f4;--surface-doc-frame: #f3f3f3;--surface-doc-frame-alt: #ececec;--app-grad-top: #ffffff;--app-grad-bottom: #ffffff;--glow-brand: transparent;--glow-cool: transparent;--fg: #0d0d0d;--fg-muted: #5d5d5d;--fg-faint: #8f8f8f;--fg-on-brand: #1c1812;--fg-inverse: #ffffff;--border: rgba(13, 13, 13, .1);--border-strong: rgba(13, 13, 13, .18);--border-doc: rgba(13, 13, 13, .08);--accent: #0d0d0d;--accent-soft: #2f2f2f;--accent-fg: #ffffff;--accent-glow: #0d0d0d;--brand-yellow: #f0c21a;--brand-yellow-deep: #c99612;--brand-amber: #e8a317;--brand-green: #1a5c45;--danger: #b42318;--danger-soft: rgba(180, 35, 24, .08);--success: #2c5f4a;--success-ring: rgba(44, 95, 74, .18);--scrollbar-thumb: rgba(13, 13, 13, .16);--scrollbar-thumb-hover: rgba(13, 13, 13, .26);--backdrop: rgba(13, 13, 13, .42);--backdrop-soft: rgba(0, 0, 0, .25);--media-bg: #111111;--radius: 26px;--radius-sm: 14px;--radius-xs: 10px;--control-radius: var(--radius-xs);--control-pad-y: 10px;--control-pad-x: 12px;--control-font: var(--text-md);--control-line: 1.45;--control-min-h: 40px;--control-border: var(--border);--control-border-focus: color-mix(in srgb, var(--fg) 28%, var(--border-strong));--control-bg: var(--bg);--control-fg: var(--fg);--chip-min-h: 32px;--chip-pad-x: 10px;--chip-font: 13px;--chip-radius: 999px;--font: ui-sans-serif, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", 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#2f2f2f;--surface-solid: #2f2f2f;--surface-sunken: rgba(255, 255, 255, .07);--surface-sunken-soft: rgba(255, 255, 255, .035);--surface-code: #0d0d0d;--surface-code-inline: #3a3a3a;--code-keyword: #c99bf5;--code-string: #7ed3a8;--code-number: #f0b070;--code-title: #8ab6f5;--code-type: #e6c17a;--surface-code-btn: rgba(255, 252, 245, .1);--surface-doc: #2a2a2a;--surface-doc-alt: #303030;--surface-doc-frame: #262626;--surface-doc-frame-alt: #363636;--app-grad-top: #212121;--app-grad-bottom: #212121;--glow-brand: transparent;--glow-cool: transparent;--fg: #ececec;--fg-muted: #b4b4b4;--fg-faint: #8f8f8f;--fg-on-brand: #1c1812;--fg-inverse: #0d0d0d;--border: rgba(255, 255, 255, .1);--border-strong: rgba(255, 255, 255, .2);--border-doc: rgba(255, 255, 255, .08);--accent: #ffffff;--accent-soft: #ececec;--accent-fg: #0d0d0d;--accent-glow: #ececec;--brand-green: #4fb08c;--danger: #ff7a6e;--danger-soft: rgba(255, 122, 110, .14);--success: #4fb08c;--success-ring: rgba(79, 176, 140, 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var(--fg));outline-offset:2px;border-radius:var(--radius-xs)}.skip-link{position:fixed;top:8px;left:8px;z-index:200;padding:8px 14px;border-radius:var(--radius-xs);background:var(--bg-elevated);color:var(--fg);box-shadow:var(--shadow-md);transform:translateY(-200%);transition:transform .16s var(--ease)}.skip-link:focus-visible{transform:translateY(0)}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-thumb{background:var(--scrollbar-thumb);border-radius:999px;border:2px solid transparent;background-clip:padding-box}::-webkit-scrollbar-thumb:hover{background:var(--scrollbar-thumb-hover);background-clip:padding-box;border:2px solid transparent}.app{display:grid;grid-template-columns:260px 1fr;height:100%;min-height:0;overflow:hidden;background:var(--bg)}.app.sidebar-collapsed{grid-template-columns:1fr}.app.detail-open{grid-template-columns:260px 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var(--accent);background:var(--accent);color:var(--accent-fg);font-size:13px;font-weight:600;text-decoration:none;transition:background .15s var(--ease),border-color .15s var(--ease)}.topbar-login-btn:hover{background:color-mix(in srgb,var(--accent) 86%,var(--bg))}.topbar-account-btn{display:inline-flex;align-items:center;gap:6px;max-width:min(220px,42vw);min-width:0;height:34px;padding:0 8px 0 4px;border:1px solid transparent;border-radius:999px;background:transparent;color:var(--fg);font:inherit;cursor:pointer;transition:background .15s var(--ease),border-color .15s var(--ease)}.topbar-account-btn:hover,.topbar-account-btn.open{background:var(--bg-hover, rgba(13, 13, 13, .05));border-color:var(--border)}.topbar-account-menu{position:absolute;top:calc(100% + 6px);right:0;z-index:40;min-width:180px;padding:6px;border-radius:12px;border:1px solid var(--border);background:var(--bg-elevated, var(--bg));box-shadow:var(--shadow-pop, 0 10px 32px rgba(13, 13, 13, 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var(--ease)}.topbar-chip:hover:not(:disabled){background:var(--bg-hover);border-color:var(--border-strong)}.topbar-chip:disabled{opacity:.45;cursor:not-allowed}.topbar-chip-label{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topbar-thinking{position:relative;cursor:pointer;color:var(--fg-muted)}.topbar-thinking:hover:not(.disabled){color:var(--fg)}.topbar-thinking.disabled{opacity:.45;cursor:not-allowed;pointer-events:none}.topbar-thinking svg{flex-shrink:0;color:var(--accent, var(--fg-muted))}.messages{flex:1;overflow-y:auto;min-height:0;scroll-behavior:smooth;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}.messages.is-streaming{scroll-behavior:auto}.messages-inner{max-width:768px;margin:0 auto;padding:12px 20px 32px}.welcome{display:grid;place-items:center;justify-items:center;min-height:58vh;text-align:center;padding:36px 16px 24px;animation:welcome-in .55s var(--ease) both}.main.main-empty{justify-content:flex-start}.main.main-empty 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