:root{--ink:#203a32;--text:#202923;--muted:#626963;--line:#dfe4df;--soft:#f4f6f2;--gold:#b48752;--paper:#fff}
*{box-sizing:border-box}html{background:var(--paper);color:var(--text);scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;line-height:1.85}
a{color:var(--ink);text-underline-offset:4px}a:focus-visible{outline:3px solid var(--gold);outline-offset:4px}
main{width:min(860px,calc(100% - 40px));margin:0 auto;padding:48px 0 88px}
.nav{display:flex;flex-wrap:wrap;gap:16px;font-size:13px;color:var(--muted);margin-bottom:42px}.nav a{text-decoration:none}.nav a:hover{text-decoration:underline}
.eyebrow{font-size:12px;letter-spacing:.08em;color:var(--muted);text-transform:uppercase}
h1{font-size:clamp(34px,6vw,54px);line-height:1.18;letter-spacing:-.035em;margin:12px 0 18px;color:var(--text)}
h2{font-size:28px;line-height:1.4;margin:52px 0 16px;color:var(--text)}
h3{font-size:20px;line-height:1.5;margin:30px 0 10px}
.lead{font-size:19px;line-height:1.85;color:#3f4943;max-width:790px;margin:0 0 22px}
.meta{font-size:13px;color:var(--muted);line-height:1.7}
.definition{margin:28px 0;padding:22px 24px;border-left:4px solid var(--ink);background:var(--soft);font-size:19px;line-height:1.8}
.answer{font-size:18px;line-height:1.95;margin:26px 0}
.notice{padding:18px 20px;background:#fbfaf6;border:1px solid #e7dfcf;color:#4b493f;margin:26px 0}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0}
.card{display:block;padding:18px;border:1px solid var(--line);text-decoration:none;background:#fff}.card:hover{border-color:#a9b3ac}.card strong{display:block;font-size:16px;margin-bottom:5px}.card span{display:block;font-size:13px;color:var(--muted);line-height:1.7}
ul,ol{padding-left:1.35em}li{margin:.45em 0}
.quote{font-size:21px;font-weight:650;line-height:1.7;margin:30px 0;padding-left:18px;border-left:3px solid var(--gold)}
.related{margin-top:56px;padding-top:26px;border-top:1px solid var(--line)}
footer{margin-top:64px;padding-top:22px;border-top:1px solid var(--line);font-size:12px;color:var(--muted);line-height:1.8}
code{font-size:.92em;background:var(--soft);padding:.1em .35em;border-radius:3px}
@media(max-width:640px){main{width:min(100% - 28px,860px);padding-top:30px}.grid{grid-template-columns:1fr}.lead{font-size:17px}h2{font-size:25px}.definition{font-size:17px;padding:18px}.answer{font-size:17px}}