:root{--ink: #132238;--muted: #66758a;--paper: #f7f9fc;--white: #ffffff;--line: #dce4ee;--blue: #2e64d6;--blue-deep: #1e49a2;--sky: #e8f0ff;--amber: #d87925;--amber-pale: #fff1df;--serif: "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;--sans: "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;--mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;--shadow: 0 18px 60px rgba(24, 48, 86, .1)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font-family:var(--sans);line-height:1.75;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}button,input{font:inherit}::selection{background:#bdd1ff}.container{width:min(1160px,calc(100% - 40px));margin-inline:auto}.narrow{width:min(760px,calc(100% - 40px));margin-inline:auto}.eyebrow{color:var(--blue);font:500 .76rem/1.3 var(--mono);letter-spacing:.11em;text-transform:uppercase}.button{display:inline-flex;align-items:center;justify-content:center;gap:.55rem;min-height:46px;padding:.65rem 1.05rem;border:1px solid var(--ink);background:var(--ink);color:#fff;font-weight:600;border-radius:3px;transition:transform .2s ease,box-shadow .2s ease,background .2s ease}.button:hover{transform:translateY(-2px);box-shadow:5px 5px 0 var(--amber)}.button.secondary{background:transparent;color:var(--ink)}.skip-link{position:fixed;left:1rem;top:-5rem;z-index:100;padding:.7rem 1rem;background:var(--ink);color:#fff}.skip-link:focus{top:1rem}:focus-visible{outline:3px solid var(--amber);outline-offset:3px}.site-header{position:sticky;top:0;z-index:40;background:#f7f9fce6;backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}.header-inner{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:2rem}.brand{display:flex;align-items:center;gap:.72rem;font-family:var(--serif);font-weight:900;letter-spacing:-.03em}.brand-mark{display:grid;place-items:center;width:30px;height:30px;background:var(--blue);color:#fff;font:500 .72rem var(--mono);transform:rotate(-3deg)}.nav{display:flex;align-items:center;gap:1.6rem;font-size:.92rem;font-weight:600}.nav a{padding-block:.35rem;border-bottom:2px solid transparent}.nav a:hover,.nav a[aria-current=page]{color:var(--blue);border-color:var(--blue)}.site-footer{margin-top:7rem;padding:3rem 0;background:var(--ink);color:#d7e0ed}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:3rem}.footer-title{color:#fff;font:700 1.1rem var(--serif)}.footer-links{display:grid;gap:.55rem;font-size:.9rem}.footer-links a:hover{color:#fff}.footer-meta{padding-top:2rem;margin-top:2rem;border-top:1px solid #31425a;display:flex;justify-content:space-between;gap:1rem;font:.75rem var(--mono);color:#93a3b8}.ad-slot{position:relative;display:grid;place-items:center;min-height:112px;padding:1rem;border:1px dashed #aebbc9;background:repeating-linear-gradient(-45deg,#f8fafc,#f8fafc 8px,#f2f5f8 8px 16px);color:#7a899b;text-align:center}.ad-slot:before{content:"ADVERTISEMENT";position:absolute;top:.45rem;font:.58rem var(--mono);letter-spacing:.15em}.ad-slot span{max-width:26rem;font-size:.78rem}.ad-slot[data-size=sidebar]{min-height:280px}.prose{font-size:1.04rem;color:#243650}.prose h2{margin:3.2rem 0 1rem;color:var(--ink);font:700 clamp(1.45rem,3vw,2rem)/1.35 var(--serif);letter-spacing:-.025em;scroll-margin-top:6rem}.prose h3{margin:2.1rem 0 .75rem;color:var(--ink);font-size:1.16rem;line-height:1.5}.prose p{margin:1.1rem 0}.prose a{color:var(--blue-deep);border-bottom:1px solid #9db8ed}.prose a:hover{background:var(--sky)}.prose ul,.prose ol{padding-left:1.35rem}.prose li{margin:.45rem 0;padding-left:.25rem}.prose blockquote{margin:2rem 0;padding:.75rem 1.3rem;border-left:4px solid var(--amber);background:var(--amber-pale);color:#614323}.prose table{width:100%;border-collapse:collapse;margin:2rem 0;font-size:.9rem}.prose th,.prose td{padding:.8rem;border:1px solid var(--line);text-align:left;vertical-align:top}.prose th{background:var(--sky);color:var(--ink)}.prose code{padding:.12rem .35rem;border-radius:3px;background:#e9eef5;font:.85em var(--mono)}.prose pre{overflow:auto;padding:1.2rem;border-radius:4px}.prose pre code{padding:0;background:none}.prose hr{margin:3rem 0;border:0;border-top:1px solid var(--line)}@media(max-width:760px){.container,.narrow{width:min(100% - 28px,680px)}.nav{gap:1rem}.nav a:last-child{display:none}.footer-grid{grid-template-columns:1fr;gap:1.4rem}.footer-meta{flex-direction:column}.site-footer{margin-top:4rem}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}