:root{--dark:#112d32;--light:#f1fbfa;--a:#00a896;--b:#ff6b35;--c:#ffd166;--ink:#151923;--muted:#647086;--line:rgba(120,132,158,.24);--panel:rgba(255,255,255,.88);--shadow:0 22px 64px rgba(10,16,28,.16)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"Inter","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--ink);background:var(--light);line-height:1.72}a{text-decoration:none;color:inherit}.site-header{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px clamp(18px,4.8vw,62px);border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--light) 88%,white 12%);backdrop-filter:blur(18px)}.brand{display:inline-flex;align-items:center;gap:10px;font-weight:900}.brand-mark{display:grid;width:42px;height:42px;place-items:center;border-radius:10px;color:white;background:linear-gradient(135deg,var(--dark),var(--a));box-shadow:0 12px 28px color-mix(in srgb,var(--a) 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