:root{--ink:#142c43;--blue:#28648b;--gold:#b38a57;--paper:#f7f5f0;--line:#d8dedf;--muted:#617181;--shadow:0 24px 70px rgba(19,45,61,.13)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans CJK SC","Microsoft YaHei",system-ui,sans-serif;overflow-x:hidden}body::before{content:"";position:fixed;inset:0;z-index:-1;background:radial-gradient(circle at 88% 4%,#dce8eb 0,transparent 35%),radial-gradient(circle at 8% 94%,#e7e1d5 0,transparent 42%);pointer-events:none}button{font:inherit;cursor:pointer}img{display:block;max-width:100%}.topbar{height:74px;max-width:1500px;margin:auto;padding:0 clamp(18px,4vw,48px);display:flex;align-items:center;gap:25px}.brand{display:flex;align-items:center;gap:12px;white-space:nowrap;font-weight:700;letter-spacing:.13em}.brand-mark{border:1px solid 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