:root{--ink:#20221f;--muted:#62675f;--accent:#bd4f19;--line:#e5dfd5;--paper:#fffcf7}
*{box-sizing:border-box}
main,section,.card,nav div{min-width:0;overflow-wrap:anywhere}
html{scroll-behavior:smooth;scroll-padding-top:100px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.85}
.wrap{max-width:1120px;margin:auto;padding:0 28px}
a{color:var(--accent);text-underline-offset:4px}
a:hover{text-decoration-thickness:2px}
a:focus-visible{outline:3px solid var(--accent);outline-offset:5px}
header{position:sticky;top:0;z-index:2;background:#fffcf7f5;border-bottom:1px solid var(--line)}
nav{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:20px}
nav div{display:flex;gap:24px;flex-wrap:wrap}
nav a{text-decoration:none;color:var(--ink)}
.brand{font-size:28px;font-weight:800}
.breadcrumb{padding-top:30px;color:var(--muted);font-size:14px}
.hero{padding:46px 0 20px}
.eyebrow{color:var(--accent);font-size:13px;font-weight:800;letter-spacing:.12em}
h1{font-size:clamp(32px,5vw,58px);line-height:1.2;letter-spacing:-.025em;max-width:980px;margin:18px 0 24px}
h2{font-size:clamp(24px,3vw,32px);line-height:1.4;margin:0 0 20px}
h3{font-size:21px;line-height:1.5}
p{margin:0 0 18px}
.lead{max-width:900px;font-size:21px;color:#42483f;margin:12px 0 40px}
.meta,.muted{color:var(--muted);font-size:15px}
section{padding:40px 0;border-top:1px solid var(--line)}
.article{max-width:860px}
.article p,.article li{font-size:18px}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.card{border:1px solid var(--line);border-radius:18px;padding:25px;background:#fff}
.card p{color:#50584c}
.card h3{margin:8px 0 14px}
.actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin:24px 0}
.button{display:inline-block;background:var(--ink);color:#fff;padding:12px 22px;border-radius:30px;text-decoration:none;font-weight:700}
.copy{font:inherit;border:1px solid var(--ink);background:#fff;color:var(--ink);padding:12px 18px;border-radius:30px;min-height:48px;cursor:pointer;max-width:100%}
.copy:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:4px}
.toc{display:block;min-height:0;background:#f4ecdf;border-radius:16px;padding:20px 24px;margin-bottom:32px}
.toc ul{margin:0;padding-left:20px}
.toc a{display:inline-block;padding:6px 0}
.contact{background:#f4ecdf;border-radius:22px;margin:46px 0;padding:32px}
.contact .eyebrow{margin-bottom:12px}
details{padding:20px 0;border-bottom:1px solid var(--line)}
summary{font-size:19px;font-weight:700;cursor:pointer}
details p{margin:14px 0 0}
.source{color:var(--muted)}
footer{padding-bottom:35px!important;font-size:14px;color:var(--muted)}
.skip{position:absolute;left:16px;top:-80px;background:#fff;padding:12px;z-index:5}
.skip:focus{top:12px}
@media(max-width:760px){.grid{grid-template-columns:1fr}.wrap{padding:0 20px}nav{align-items:flex-start;padding-top:16px!important;padding-bottom:16px!important}nav div{gap:8px 16px;font-size:14px;justify-content:flex-end}.hero{padding-top:30px}.lead{font-size:18px}.contact{padding:24px}section{padding:30px 0}}
@media(max-width:480px){nav{gap:12px;align-items:center}nav div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:2px 8px}nav div a{min-height:44px;display:flex;align-items:center;justify-content:center;text-align:center;font-size:12px}h1{font-size:clamp(27px,7.5vw,34px);line-height:1.35}.hero{padding:24px 0 12px}.lead{line-height:1.85;margin-bottom:28px}.article p,.article li{font-size:17px}.actions{gap:12px}.actions .button,.actions .copy{width:100%;text-align:center}.card{padding:20px}.contact{padding:22px 18px}summary{min-height:44px;display:list-item;line-height:1.6}.contact h2{font-size:24px}}
@media(max-width:480px){html{scroll-padding-top:150px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}