:root{--bg-0:#ffffff;--bg-1:#f7f7f8;--bg-2:#f0f0f2;--bg-3:#e6e6ea;--text-0:#111113;--text-1:#18181b;--text-2:#52525b;--text-3:#8a8a94;--accent:#0070f3;--accent-hover:#005fd0;--accent-soft:rgba(0,112,243,0.10);--border:rgba(17,17,19,0.10);--border-hover:rgba(17,17,19,0.18);--card-bg:#ffffff;--card-bg-hover:#f4f4f6;--nav-bg:rgba(255,255,255,0.82);--danger:#ef4444;--success:#22c55e;--font-sans:"Geist","Inter",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;--font-mono:"Geist Mono","JetBrains Mono",ui-monospace,"Cascadia Code",monospace;--r-sm:6px;--r-md:8px;--r-lg:12px;--ease:cubic-bezier(0.4,0,0.2,1);--dur:180ms}[data-theme=dark]{--bg-0:#0a0a0b;--bg-1:#111113;--bg-2:#18181b;--bg-3:#1f1f23;--text-0:#fafafa;--text-1:#e4e4e7;--text-2:#a1a1aa;--text-3:#71717a;--accent:#0070f3;--accent-hover:#1a86ff;--accent-soft:rgba(0,112,243,0.12);--border:rgba(255,255,255,0.08);--border-hover:rgba(255,255,255,0.16);--card-bg:#111113;--card-bg-hover:#18181b;--nav-bg:rgba(10,10,11,0.82)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg-0);color:var(--text-1);font-family:var(--font-sans);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.container{max-width:1120px;margin:0 auto;padding:0 24px}.nav{position:-webkit-sticky;position:sticky;top:0;z-index:100;background:var(--nav-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid 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h1{font-size:clamp(36px,6vw,56px);font-weight:800;letter-spacing:-.03em;color:var(--text-0);line-height:1.15;margin-bottom:20px}.hero h1 em{font-style:normal;background:linear-gradient(135deg,var(--accent),#60a5fa);-webkit-background-clip:text;background-clip:text;color:transparent}.hero p{font-size:18px;color:var(--text-2);max-width:560px;margin:0 auto 36px}.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 22px;border-radius:var(--r-md);font-size:15px;font-weight:600;border:1px solid var(--border);background:var(--bg-1);color:var(--text-1);cursor:pointer;transition:all var(--dur) 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