:root{--ink:#27343b;--ink-soft:#53616a;--blue:#315f74;--blue-2:#5c90a8;--line:#c8d8de;--paper:#f5f3ed;--white:#fff;--mist:#e9f1f3;--muted:#68767c;--max:1320px;--body:790px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.72 "Noto Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,sans-serif;-webkit-font-smoothing:antialiased}img,svg{max-width:100%;height:auto}img{display:block}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--blue-2);outline-offset:3px}::selection{background:#c7e1ea;color:#193947}.skip-link{position:absolute;left:1rem;top:-4rem;background:var(--ink);color:white;z-index:100;padding:.5rem 1rem}.skip-link:focus{top:.5rem}.container{width:min(calc(100% - 64px),var(--max));margin-inline:auto}.eyebrow,.meta,.overline{font-size:.75rem;letter-spacing:.17em;font-weight:700;text-transform:uppercase;color:var(--blue)}.section-num{font:700 .83rem/1.3 ui-monospace,SFMono-Regular,Consolas,monospace;color:var(--blue)}h1,h2,h3,p{margin-top:0}h1,h2{letter-spacing:-.055em;line-height:1.16}h1{font-size:clamp(3rem,6.5vw,6.8rem);font-weight:650}h2{font-size:clamp(2.1rem,3.6vw,3.75rem);font-weight:650}h3{font-size:1.25rem;line-height:1.35}p{margin-bottom:1.2rem}.lead{font-size:clamp(1.08rem,1.5vw,1.32rem);line-height:1.7;color:var(--ink-soft);max-width:66ch}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.7rem;min-height:48px;padding:.7rem 1.25rem;background:var(--blue);border:1px solid var(--blue);color:#fff;font-size:.9rem;font-weight:700;transition:background .2s,color .2s,transform .2s}.btn:hover{background:#21495d;transform:translateY(-2px)}.btn-quiet{background:transparent;color:var(--ink);border-color:var(--line)}.btn-quiet:hover{background:var(--mist);color:var(--ink)}.text-link{color:var(--blue);font-weight:700;border-bottom:1px solid currentColor;padding-bottom:.13rem}.text-link:hover{color:#203e4f}.arrow{font-family:Arial,sans-serif;font-size:1.2em;line-height:1}.thin-rule{border:0;border-top:1px solid var(--line);margin:0}.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}time{font-variant-numeric:tabular-nums}small{font-size:.85rem}.muted{color:var(--muted)}
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