:root{color-scheme:light;--ink:#1d1d1f;--muted:#62646c;--blue:#0066cc;--line:#e4e5ea;--ease:cubic-bezier(.23,1,.32,1)}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:#fff;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Noto Sans CJK SC",sans-serif;-webkit-font-smoothing:antialiased}
::selection{background:#c6dfff;color:#102036}
a{color:inherit;text-underline-offset:.23em}
a:focus-visible,button:focus-visible{outline:3px solid var(--blue);outline-offset:5px}
.skip{position:absolute;top:-80px;left:12px;background:#fff;padding:12px;z-index:5}.skip:focus{top:12px}
.header{position:sticky;top:0;z-index:2;background:rgb(250 250 252 / .86);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.bar{width:min(1120px,calc(100% - 48px));height:62px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px}
.back{display:flex;align-items:center;gap:10px;font-size:14px;text-decoration:none}.back::before{content:"";width:6px;height:6px;border-left:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg)}
.back:hover{color:var(--blue)}
.brand{display:flex;align-items:center;gap:9px;font-weight:650;text-decoration:none;font-size:16px}.brand img{width:29px;height:29px}
.progress{position:absolute;bottom:-1px;left:0;right:0;height:2px;background:#0b68d8;transform:scaleX(var(--progress,0));transform-origin:left;pointer-events:none}
.measure{width:min(720px,calc(100% - 48px));margin-inline:auto}
.article-head{padding-top:84px;padding-bottom:46px;animation:enter .65s var(--ease) both}
h1{margin:0 0 27px;max-width:12em;font-size:clamp(38px,5.2vw,66px);line-height:1.2;letter-spacing:-.035em;font-weight:700;text-wrap:balance}
.meta{display:flex;align-items:center;flex-wrap:wrap;gap:12px;font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}
.example{padding:5px 9px;background:#f0f1f5;border-radius:6px;font-size:12px;color:#575963}
.tools{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:16px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:38px;font-size:12px;color:var(--muted)}
button{border:0;background:#f0f1f5;border-radius:999px;padding:9px 15px;color:#43454d;font:inherit;font-size:13px;font-weight:600;cursor:pointer;transition:background .18s var(--ease),transform .15s var(--ease)}
button:hover{background:#e5e9f0}button:active{transform:scale(.97)}button[aria-pressed=true]{background:#e3efff;color:#0055aa}
.prose{font-size:19px;line-height:2;letter-spacing:.01em;color:#35363c;padding-bottom:28px;animation:enter .75s .1s var(--ease) both}
.prose p{margin:0 0 26px}.prose .opening{font-size:25px;line-height:1.65;color:#1d1d1f;letter-spacing:-.015em;margin-bottom:34px}
.large-type .prose{font-size:22px}.large-type .prose .opening{font-size:28px}
.end{display:block;width:24px;height:3px;background:#fcca1a;border-radius:3px;margin:20px auto 56px}
.next{border-top:1px solid var(--line);padding:35px 0 72px;display:grid;grid-template-columns:1fr 1fr;gap:35px}
.next a{display:block;text-decoration:none}.next small{display:block;color:var(--muted);font-size:12px;margin-bottom:9px}.next strong{display:block;font-size:19px;line-height:1.5;font-weight:600;transition:color .18s var(--ease)}.next a:hover strong{color:var(--blue)}.next a:last-child{text-align:right}
footer{background:#f5f5f7;color:var(--muted);font-size:12px;padding:26px 24px;text-align:center}
@view-transition{navigation:auto}
@keyframes enter{from{opacity:.3;transform:translateY(15px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:650px){.bar{height:57px}.article-head{padding-top:53px;padding-bottom:32px}h1{font-size:39px}.prose{font-size:17px;line-height:1.95}.prose .opening{font-size:22px}.large-type .prose{font-size:20px}.large-type .prose .opening{font-size:25px}.next{gap:22px;padding-bottom:52px}.next strong{font-size:16px}.tools{margin-bottom:29px}.end{margin-bottom:40px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.article-head,.prose{animation:none}a,button,.next strong{transition:none}::view-transition-old(root),::view-transition-new(root){animation:none}}
@media(prefers-reduced-transparency:reduce){.header{background:#fafafc;backdrop-filter:none;-webkit-backdrop-filter:none}}