:root{--ink: #0f172a;--ink-2: #475569;--ink-3: #94a3b8;--line: #e2e8f0;--line-strong: #cbd5e1;--paper: #ffffff;--bg: #f8fafc;--brand: #2563eb;--brand-dark: #1d4ed8;--brand-soft: #eff6ff;--accent: #f97316;--radius: 10px;--font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, sans-serif;--maxw: 1120px}*{box-sizing:border-box;margin:0;padding:0}html{font-family:var(--font);color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased;scroll-behavior:smooth}body{line-height:1.7;font-size:16px}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}ul,ol{padding-left:1.25em}.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}h1,h2,h3,h4{line-height:1.3;font-weight:700}h1{font-size:clamp(30px,5vw,46px);letter-spacing:-.01em}h2{font-size:clamp(24px,3.4vw,34px)}h3{font-size:20px}.section{padding:72px 0;border-top:1px solid var(--line)}@media (max-width: 720px){.section{padding:48px 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