:root{color-scheme:light;--ink:#142139;--muted:#46566e;--blue:#2055cc;--line:#d9e1ed;--paper:#fff;--wash:#f1f5fc;font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-size:100%}
*{box-sizing:border-box}body{margin:0;line-height:1.75}a{color:var(--blue);text-underline-offset:.25em}a:hover{text-decoration-thickness:2px}a:focus-visible,summary:focus-visible{outline:3px solid #c05600;outline-offset:5px}.wrap{width:min(1120px,calc(100% - 3rem));margin-inline:auto}.skip{position:absolute;top:-100px;left:1rem;background:white;padding:.8rem;z-index:2}.skip:focus{top:1rem}.masthead{display:flex;justify-content:space-between;align-items:center;gap:2rem;padding-block:1.5rem;border-bottom:1px solid var(--line)}.brand{font-size:1.5rem;font-weight:800;text-decoration:none;color:var(--ink);line-height:1.3}.brand span{display:block;font-size:.875rem;font-weight:400;color:var(--muted);margin-top:.3rem}nav{display:flex;flex-wrap:wrap;gap:.7rem 1.5rem}nav a{font-size:.95rem;text-decoration:none;color:var(--ink);padding-block:.5rem}.hero{display:grid;grid-template-columns:1.65fr 1fr;gap:4rem;padding-block:5rem}.eyebrow{font-size:.875rem;font-weight:700;letter-spacing:.07em;color:var(--blue);margin:0 0 1rem}h1{font-size:clamp(2.1rem,4.3vw,3.7rem);line-height:1.23;letter-spacing:-.025em;margin:0 0 1.5rem}h2{font-size:clamp(1.55rem,2.5vw,2.15rem);line-height:1.4;margin:0 0 1.5rem}h3{font-size:1.15rem;margin-top:0}.lead{font-size:1.15rem;color:var(--muted);max-width:38rem}.button{display:inline-block;background:var(--blue);color:#fff;padding:.8rem 1.25rem;border-radius:.35rem;text-decoration:none;margin-top:1rem;font-weight:600}.principles{padding:2rem;background:var(--ink);color:#fff;border-top:5px solid #82b5ff;align-self:center}.principles .eyebrow,.principles a{color:#b7d2ff}.principles p{margin-bottom:1rem}.section{padding-block:3.5rem;border-top:1px solid var(--line);scroll-margin-top:1rem}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:2.5rem;padding-left:1.4rem}.steps li{padding-left:.5rem}.steps li::marker{color:var(--blue);font-weight:800}.steps strong{font-size:1.15rem}.steps p,.columns p{color:var(--muted)}.columns{display:grid;grid-template-columns:1fr 1fr;gap:3rem}.release{background:var(--wash)}.release p{max-width:55rem}.release h3{margin-top:2rem}details{border-bottom:1px solid var(--line);padding-block:1rem}summary{cursor:pointer;font-weight:650;padding:.3rem}details p{max-width:58rem;color:var(--muted)}.footer{display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem;border-top:1px solid var(--line);padding-block:2rem;font-size:.875rem;color:var(--muted)}
.brand{display:flex;align-items:center;gap:.75rem}.brand-logo{display:block;width:3.25rem;height:3.25rem;flex-shrink:0}.brand .brand-copy{font-size:inherit;font-weight:inherit;color:inherit;margin-top:0}
@media(max-width:760px){.masthead{align-items:flex-start;flex-direction:column;gap:1rem}.hero,.columns,.steps{grid-template-columns:1fr;gap:1.7rem}.hero{padding-block:2.5rem}.section{padding-block:2.5rem}.principles{padding:1.5rem}.wrap{width:calc(100% - 2rem)}nav{gap:.3rem 1rem}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}
/* text-expansion safeguards: shrinkable flex/grid children may wrap; long tokens may wrap */
.brand,nav,.brand .brand-copy,.hero>div,.hero .principles,.steps li,.columns>div,.footer>span{min-width:0}
h1,h2,h3,summary,.lead,.steps p,.columns p,.release p,details p{overflow-wrap:anywhere}