@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Noto+Serif+SC:wght@500;700;900&display=swap');
:root{--ink:#20231e;--muted:#686d63;--paper:#f4f5ef;--lime:#d7f25e;--line:#d8ddd1;--dark:#20231e}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,'Microsoft YaHei',sans-serif}a{color:inherit;text-decoration:none}.wrap{width:min(1180px,calc(100% - 48px));margin:auto}.topline{background:var(--dark);color:#f4f5ef;padding:10px 24px;font:11px 'DM Mono',monospace;letter-spacing:.08em;display:flex;justify-content:space-between}.topline span{color:#aab0a2}.nav{height:86px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;gap:10px;align-items:center}.brand-mark{display:grid;place-items:center;background:var(--lime);width:36px;height:36px;border-radius:50%;font-family:serif;font-size:20px}.brand b{display:block;font-family:'Noto Serif SC',serif;font-size:17px}.brand small{display:block;color:var(--muted);font:9px 'DM 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span,.nav nav{display:none}.wrap{width:calc(100% - 32px)}.hero,.tool-grid,.split,.about-grid,.contact-inner{grid-template-columns:1fr;gap:42px}.hero{padding:60px 0}.hero-art{height:360px}.hero h1{font-size:43px}.tool-grid h2,.geo-section h2,.about h2,.contact h2{font-size:39px}.quiz{grid-template-columns:1fr}.service-grid{grid-template-columns:1fr}.section{padding:70px 0}.proof{gap:9px;flex-wrap:wrap}.nav{height:70px}}