:root{--ink:#17213b;--muted:#687087;--paper:#f7f8fc;--line:#dfe3ee;--mint:#73e0bd;--violet:#7768e6;--coral:#ff8c70;--white:#fff;--radius:24px;--shadow:0 18px 50px rgba(23,33,59,.09)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font:16px/1.75 "Microsoft YaHei UI","PingFang SC",system-ui,sans-serif}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}.shell{width:min(1180px,calc(100% - 44px));margin:auto}.skip{position:fixed;left:12px;top:-60px;background:var(--ink);color:#fff;padding:10px 16px;z-index:99}.skip:focus{top:12px}.topbar{position:sticky;top:0;z-index:30;background:rgba(247,248,252,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}.topbar-inner{height:78px;display:flex;align-items:center;justify-content:space-between}.brand{width:220px}.nav{display:flex;gap:28px;align-items:center;font-weight:700;font-size:14px}.nav 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