:root{--bg: #0A0D14;--bg-elev: #10141E;--surface: #141927;--surface-2: #1B2132;--border: rgba(255, 255, 255, .07);--border-strong: rgba(255, 255, 255, .14);--text: #E8EAF0;--text-2: #B4BACB;--text-3: #7A8298;--text-4: #525A70;--accent: #F59E0B;--accent-hi: #FBBF24;--accent-lo: #B45309;--accent-soft: rgba(245, 158, 11, .14);--accent-line: rgba(245, 158, 11, .35);--accent-glow: rgba(245, 158, 11, .18);--radius: 12px;--radius-sm: 8px;--radius-lg: 18px;--font-sans: "Geist", "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;--font-mono: "Geist Mono", "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;--font-serif: "Source Han Serif SC", "Noto Serif SC", ui-serif, Georgia, serif}[data-mode=light]{--bg: #FAFAF7;--bg-elev: #FFFFFF;--surface: #FFFFFF;--surface-2: #F5F4EF;--border: rgba(0, 0, 0, .08);--border-strong: rgba(0, 0, 0, .16);--text: #1A1D26;--text-2: #3D4456;--text-3: #6B7388;--text-4: 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var(--border);font-family:var(--font-mono);font-size:11px;color:var(--text-4);letter-spacing:.04em}.theme-toggle{width:34px;height:34px;border-radius:8px;display:inline-grid;place-items:center;color:var(--text-2);position:relative;transition:color .15s,background .15s}.theme-toggle:hover{background:var(--surface);color:var(--text)}.theme-toggle svg{width:16px;height:16px;transition:opacity .15s,transform .2s}.theme-toggle .sun,.theme-toggle .moon{position:absolute}[data-mode=dark] .theme-toggle .sun{opacity:1;transform:rotate(0) scale(1)}[data-mode=dark] .theme-toggle .moon{opacity:0;transform:rotate(90deg) scale(.7)}[data-mode=light] .theme-toggle .sun{opacity:0;transform:rotate(-90deg) scale(.7)}[data-mode=light] .theme-toggle .moon{opacity:1;transform:rotate(0) scale(1)}[data-radius=sharp]{--radius: 4px;--radius-sm: 3px;--radius-lg: 6px}[data-radius=medium]{--radius: 12px;--radius-sm: 8px;--radius-lg: 18px}[data-radius=round]{--radius: 18px;--radius-sm: 12px;--radius-lg: 26px}@media (max-width: 980px){.stats{grid-template-columns:repeat(2,1fr)}.stat:nth-child(2){border-right:0}.stat:nth-child(1),.stat:nth-child(2){border-bottom:1px solid var(--border)}.why-grid{grid-template-columns:1fr}.code-section{grid-template-columns:1fr;gap:32px}.tools-grid{grid-template-columns:repeat(2,1fr)}.steps{grid-template-columns:1fr 1fr}.step:nth-child(2){border-right:0}.faq-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}}.chat-app{display:grid;grid-template-columns:248px 1fr;height:100vh;overflow:hidden;transition:grid-template-columns .2s}.chat-app.collapsed{grid-template-columns:0 1fr}.chat-app.collapsed .chat-side{transform:translate(-100%)}.chat-side{background:var(--bg-elev);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden;transition:transform .2s}.side-brand{display:flex;align-items:center;gap:10px;padding:18px 18px 14px;font-weight:600;font-size:15px;position:relative}.side-brand 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svg{width:15px;height:15px;color:var(--text-3)}.side-search-btn{margin:0 12px 2px;height:38px;display:flex;align-items:center;gap:10px;padding:0 12px;border-radius:7px;font-size:13px;color:var(--text-2);background:transparent;border:0;cursor:pointer;transition:background .15s,color .15s;text-align:left}.side-search-btn:hover{background:var(--surface);color:var(--text)}.side-search-btn .ico{width:15px;height:15px;color:var(--text-3);flex-shrink:0}.side-search-btn .label{flex:1}.side-search-btn .kbd{font-family:var(--font-mono);font-size:10.5px;color:var(--text-4);padding:1px 5px;border:1px solid var(--border);border-radius:4px}.side-search{position:relative;margin:6px 12px 14px}.side-search input{width:100%;height:36px;padding:0 12px 0 34px;background:var(--surface);border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:13px;font-family:var(--font-sans);outline:none}.side-search input:focus{border-color:var(--border-strong)}.side-search input::placeholder{color:var(--text-4)}.side-search svg{position:absolute;left:11px;top:50%;transform:translateY(-50%);width:14px;height:14px;color:var(--text-4)}.side-nav{display:flex;flex-direction:column;gap:2px;padding:0 12px 10px}.side-nav-item{display:flex;align-items:center;gap:10px;height:38px;padding:0 12px;border-radius:7px;font-size:13px;color:var(--text-2);transition:background .15s,color .15s;cursor:pointer}.side-nav-item:hover:not(.disabled):not(.active){background:var(--surface);color:var(--text)}.side-nav-item.active{background:var(--accent-soft);color:var(--accent)}.side-nav-item.disabled{color:var(--text-4);cursor:not-allowed}.side-nav-group{width:100%;background:transparent;border:0;font:inherit;font-size:13px;text-align:left;-webkit-appearance:none;-moz-appearance:none;appearance:none}.side-nav-sub{display:flex;flex-direction:column;gap:2px;margin:2px 0 2px 19px;padding-left:9px;border-left:1px solid var(--border)}.side-nav-item 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