:root{--blue:#286cf1;--ink:#30343b;--muted:#9298a1;--line:#e5e7eb;--bg:#f7f7f7;--navy:#142036}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font:14px/1.6 "PingFang SC","Microsoft YaHei",Arial,sans-serif;background:#fff}button,input,select,textarea{font:inherit;color:inherit}button,a{cursor:pointer}a{text-decoration:none;color:inherit}.shell{width:min(1200px,calc(100% - 40px));margin:auto}.site-header{height:64px;background:#fff}.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between}.main-nav{display:flex;height:100%;gap:52px}.main-nav a{display:flex;align-items:center;position:relative}.main-nav a.active{color:var(--blue)}.main-nav a.active:after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:var(--blue)}.account-button{border:0;background:none}.user-icon{font-size:20px}.button{display:inline-flex;align-items:center;justify-content:center;height:46px;padding:0 30px;border:1px solid var(--blue);border-radius:3px;background:#fff;color:var(--blue)}.button.primary{background:var(--blue);color:#fff}.button.wide{width:100%}.page-gray{background:var(--bg)}.home-hero{height:515px;background:linear-gradient(120deg,#eef6ff,#dcecff 55%,#bddbff);position:relative}.home-hero:after,.knowledge-hero:after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.22) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.18) 1px,transparent 1px);background-size:90px 90px;pointer-events:none}.hero-copy{padding-top:118px;position:relative;z-index:1}.hero-copy h1{font-size:42px;margin:0 0 10px}.hero-copy h2{font-size:41px;margin:0}.hero-copy h2 b{color:var(--blue)}.hero-copy p{font-size:18px}.hero-visual{position:absolute;right:14%;top:95px}.brand-shield{width:150px;height:170px;display:grid;place-items:center;color:#fff;font:bold 72px Arial;background:linear-gradient(145deg,#80b5ff,#165fea);clip-path:polygon(50% 0,92% 15%,82% 75%,50% 100%,18% 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