:root{--background:#f8fafc;--foreground:#111827;--muted:#64748b;--muted-soft:#f1f5f9;--card:#fff;--border:#e2e8f0;--border-strong:#cbd5e1;--primary:#111827;--primary-soft:#eef2ff;--accent:#0f766e;--accent-soft:#ccfbf1;--blue:#2563eb;--amber:#d97706;--rose:#e11d48;--shadow:0 24px 70px #0f172a1a;--radius:20px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--background);color:var(--foreground);text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft YaHei,PingFang SC,sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}button,a{-webkit-tap-highlight-color:transparent}.site-header{z-index:20;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#f8fafcdb;border-bottom:1px solid #e2e8f0c7;justify-content:space-between;align-items:center;gap:24px;height:68px;padding:0 max(24px,50vw - 560px);display:flex;position:sticky;top:0}.brand{align-items:center;gap:12px;min-width:max-content;display:inline-flex}.brand strong{letter-spacing:0;font-size:16px;line-height:1.1;display:block}.brand small{color:var(--muted);margin-top:3px;font-size:11px;display:block}.octopus-mark{flex:none;justify-content:center;align-items:center;width:40px;height:40px;display:inline-flex;position:relative}.octopus-logo-img{object-fit:contain;filter:drop-shadow(0 12px 18px #0f172a29);width:40px;height:40px;display:block}.site-nav{color:var(--muted);align-items:center;gap:28px;font-size:14px;display:flex}.site-nav a{transition:color .18s}.site-nav a:hover{color:var(--foreground)}.header-actions{align-items:center;gap:10px;min-width:max-content;display:inline-flex}.language-toggle{border:1px solid var(--border-strong);background:#ffffffc7;border-radius:999px;align-items:center;height:36px;padding:3px;display:inline-flex}.language-option{min-width:48px;height:28px;color:var(--muted);cursor:pointer;font:inherit;letter-spacing:0;background:0 0;border:0;border-radius:999px;justify-content:center;align-items:center;padding:0 10px;font-size:12px;font-weight:800;transition:background .18s,color .18s,box-shadow .18s;display:inline-flex}.language-option[data-active=true]{color:#fff;background:#111827;box-shadow:0 8px 18px #0f172a24}.header-download{background:var(--primary);color:#fff;border-radius:999px;justify-content:center;align-items:center;min-width:92px;height:36px;font-size:14px;font-weight:700;transition:transform .18s,background .18s;display:inline-flex}.header-download:hover{background:#020617;transform:translateY(-1px)}.hero{border-bottom:1px solid var(--border);position:relative;overflow:hidden}.hero:before{content:"";z-index:-2;background:linear-gradient(#ffffffd6,#f8fafcf7),repeating-linear-gradient(90deg,#0f172a09 0 1px,#0000 1px 88px),repeating-linear-gradient(0deg,#0f172a07 0 1px,#0000 1px 88px);position:absolute;inset:0}.hero-inner{text-align:center;width:min(1120px,100% - 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