.home[data-v-95bc4b60]{position:relative;min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:80px 24px 48px;overflow:hidden}.repo-link[data-v-95bc4b60]{position:absolute;top:18px;right:32px;z-index:10;display:grid;place-items:center;width:34px;height:34px;border:1.5px solid var(--ink);border-radius:50%;color:var(--ink);transition:background .3s,color .3s,transform .3s}.repo-link svg[data-v-95bc4b60]{width:17px;height:17px;fill:currentColor}.repo-link[data-v-95bc4b60]:hover{background:var(--ink);color:var(--paper);transform:rotate(180deg)}.ring-1[data-v-95bc4b60]{width:140vmin;height:140vmin;top:50%;left:50%;translate:-50% -50%}.ring-2[data-v-95bc4b60]{width:96vmin;height:96vmin;top:50%;left:50%;translate:-50% -50%;border-style:dashed}.ring-3[data-v-95bc4b60]{width:62vmin;height:62vmin;top:50%;left:50%;translate:-50% -50%;border-width:2px;animation-direction:reverse}.ring-4[data-v-95bc4b60]{width:20vmin;height:20vmin;top:12%;right:8%}.hero[data-v-95bc4b60]{position:relative;text-align:center;max-width:640px}.kicker[data-v-95bc4b60]{font-size:12px;letter-spacing:.3em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:28px}.title[data-v-95bc4b60]{font-family:var(--serif);font-size:clamp(48px,9vw,92px);font-weight:600;line-height:1.1;letter-spacing:-.01em}.title em[data-v-95bc4b60]{display:block;font-style:normal;font-size:.32em;letter-spacing:.5em;text-transform:uppercase;color:var(--ink-soft);margin-top:12px;font-family:var(--sans);font-weight:400}.pi-glyph[data-v-95bc4b60]{color:var(--accent)}.lede[data-v-95bc4b60]{margin-top:28px;font-size:17px;color:var(--ink-soft)}.digits[data-v-95bc4b60]{margin-top:20px;font-family:var(--mono);font-size:11px;letter-spacing:.35em;color:var(--ink-faint);white-space:nowrap;overflow:hidden;-webkit-mask-image:linear-gradient(90deg,#000 55%,transparent);mask-image:linear-gradient(90deg,#000 55%,transparent)}.toc[data-v-95bc4b60]{position:relative;margin-top:72px;display:flex;flex-direction:column;gap:14px;width:min(520px,100%)}.toc-item[data-v-95bc4b60]{display:flex;align-items:center;gap:20px;padding:18px 24px;background:#ffffffb3;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);border:1px solid var(--line);border-radius:var(--radius);transition:border-color .3s,transform .3s,box-shadow .3s}.toc-item[data-v-95bc4b60]:hover{border-color:var(--ink);transform:translateY(-3px);box-shadow:0 14px 40px -18px #11111440}.toc-num[data-v-95bc4b60]{position:relative;width:56px;height:56px;flex:none;display:grid;place-items:center}.toc-ring[data-v-95bc4b60]{position:absolute;top:0;right:0;bottom:0;left:0;transform:rotate(-90deg)}.toc-ring-bg[data-v-95bc4b60]{fill:none;stroke:var(--line);stroke-width:2}.toc-ring-arc[data-v-95bc4b60]{fill:none;stroke:var(--accent);stroke-width:2;stroke-linecap:round;stroke-dasharray:207.3;stroke-dashoffset:207.3;transition:stroke-dashoffset .6s cubic-bezier(.2,.7,.2,1)}.toc-item:hover .toc-ring-arc[data-v-95bc4b60]{stroke-dashoffset:0}.toc-num-text[data-v-95bc4b60]{font-family:var(--serif);font-size:20px}.toc-meta[data-v-95bc4b60]{flex:1;display:flex;flex-direction:column;min-width:0}.toc-title[data-v-95bc4b60]{font-weight:700;font-size:16px}.toc-sub[data-v-95bc4b60]{font-size:13px;color:var(--ink-faint)}.toc-arrow[data-v-95bc4b60]{color:var(--ink-faint);transition:transform .3s,color .3s}.toc-item:hover .toc-arrow[data-v-95bc4b60]{transform:translate(4px);color:var(--accent)}.colophon[data-v-95bc4b60]{position:relative;margin-top:88px;display:flex;align-items:center;gap:14px;font-size:12px;color:var(--ink-faint);letter-spacing:.06em}.chapter[data-v-3263c63d]{position:relative;padding-top:72px}.chapter-nav[data-v-3263c63d]{max-width:720px;margin:0 auto;padding:28px 24px 96px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:24px}.chapter-nav-link[data-v-3263c63d]{display:flex;align-items:center;gap:14px;text-decoration:none;color:var(--ink)}.chapter-nav-link.next[data-v-3263c63d]{margin-left:auto;text-align:right}.nav-circle[data-v-3263c63d]{flex:none;width:34px;height:34px;display:grid;place-items:center;border:1.5px solid var(--ink-faint);border-radius:50%;font-size:14px;line-height:1;color:var(--ink-soft);transition:border-color .25s,color .25s}.chapter-nav-link:hover .nav-circle[data-v-3263c63d]{border-color:var(--accent);color:var(--accent)}.nav-kicker[data-v-3263c63d]{display:block;font-size:11px;letter-spacing:.1em;color:var(--ink-faint)}.nav-title[data-v-3263c63d]{display:block;margin-top:5px;font-family:var(--serif);font-size:18px;color:var(--ink);transition:color .25s}.chapter-nav-link:hover .nav-title[data-v-3263c63d]{color:var(--accent)}.dial[data-v-3263c63d]{position:fixed;right:28px;bottom:28px;z-index:60;width:64px;height:64px;display:grid;place-items:center;background:#fbfbf9d9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-radius:50%;transition:transform .3s}.dial[data-v-3263c63d]:hover{transform:scale(1.08)}.dial-svg[data-v-3263c63d]{position:absolute;top:0;right:0;bottom:0;left:0;transform:rotate(-90deg)}.dial-bg[data-v-3263c63d]{fill:none;stroke:var(--line);stroke-width:2.5}.dial-arc[data-v-3263c63d]{fill:none;stroke:var(--accent);stroke-width:2.5;stroke-linecap:round;stroke-dasharray:163.36;transition:stroke-dashoffset .15s linear}.dial-num[data-v-3263c63d]{font-family:var(--serif);font-size:18px}.chapter-head[data-v-3263c63d]{max-width:720px;margin:0 auto;padding:64px 24px 0}.chapter-kicker[data-v-3263c63d]{font-size:12px;letter-spacing:.3em;color:var(--ink-faint);margin-bottom:20px}.chapter-head-row[data-v-3263c63d]{display:flex;align-items:center;gap:24px}.head-circle[data-v-3263c63d]{position:relative;flex:none;width:72px;height:72px;border:1.5px solid var(--ink);border-radius:50%;display:grid;place-items:center}.head-circle-num[data-v-3263c63d]{font-family:var(--serif);font-size:20px;color:var(--ink)}.head-circle-orbit[data-v-3263c63d]{position:absolute;top:0;right:0;bottom:0;left:0;animation:orbit 14s linear infinite}.head-circle-dot[data-v-3263c63d]{position:absolute;top:0;left:50%;translate:-50% -50%;width:10px;height:10px;border-radius:50%;background:var(--accent)}.chapter-title[data-v-3263c63d]{font-family:var(--serif);font-size:clamp(30px,5vw,44px);line-height:1.25;margin:0}.chapter-sub[data-v-3263c63d]{margin-top:6px;color:var(--ink-soft);font-size:15px}.chapter-body[data-v-3263c63d] h1:first-child{display:none}.pinned-stack[data-v-3263c63d]{position:fixed;top:76px;right:28px;z-index:70;display:flex;flex-direction:column;align-items:flex-end;gap:12px;width:340px;max-width:calc(100vw - 56px)}.pinned-card[data-v-3263c63d]{position:relative;max-width:100%;border-radius:14px;border:1px solid var(--line);background:#f2f2eb;box-shadow:0 14px 36px -20px #1111144d;max-height:116px;overflow:hidden;transition:max-height .5s cubic-bezier(.22,1,.36,1),width .5s cubic-bezier(.22,1,.36,1),box-shadow .35s ease}.pinned-card[data-v-3263c63d]:after{content:"";position:absolute;inset:auto 0 0 0;height:40px;background:linear-gradient(transparent,#f2f2eb 80%);pointer-events:none;transition:opacity .25s ease}.pinned-card.open[data-v-3263c63d]{max-width:min(52vw,900px);box-shadow:0 24px 64px -24px #11111466}.pinned-card.open[data-v-3263c63d]:after{opacity:0}.pinned-card.settled[data-v-3263c63d]{overflow:auto}.pinned-card[data-v-3263c63d] pre{margin:0;border:none;background:transparent;padding:14px 16px;font-size:12px}.pinned-close[data-v-3263c63d]{position:absolute;top:8px;right:8px;z-index:3;width:22px;height:22px;padding:0;border-radius:50%;border:1px solid var(--line);background:#ffffffd9;color:var(--ink-soft);font-size:13px;line-height:1;cursor:pointer;opacity:0;transition:opacity .2s,color .2s,border-color .2s}.pinned-card:hover .pinned-close[data-v-3263c63d]{opacity:1}.pinned-close[data-v-3263c63d]:hover{color:var(--ink);border-color:var(--ink)}@media(max-width:900px){.pinned-stack[data-v-3263c63d]{display:none}}.toc-rail[data-v-3263c63d]{position:fixed;top:50%;left:max(28px,calc(50% - 640px));transform:translateY(-50%);z-index:40;width:218px;max-height:76vh;overflow-y:auto;padding:4px 2px 4px 10px;margin-left:-8px;font-size:13px;line-height:1.5;scrollbar-width:thin;scrollbar-color:transparent transparent}.toc-rail[data-v-3263c63d]:hover{scrollbar-color:var(--line) transparent}.toc-rail[data-v-3263c63d]::-webkit-scrollbar{width:4px}.toc-rail[data-v-3263c63d]::-webkit-scrollbar-thumb{background:transparent;border-radius:2px}.toc-rail[data-v-3263c63d]:hover::-webkit-scrollbar-thumb{background:var(--line)}.toc-rail-title[data-v-3263c63d]{font-size:11px;letter-spacing:.3em;color:var(--ink-faint);margin:0 0 14px 2px}.toc-link[data-v-3263c63d]{display:flex;align-items:flex-start;gap:10px;padding:5px 0;color:var(--ink-faint);transition:color .2s}.toc-link[data-v-3263c63d]:hover{color:var(--ink)}.toc-link.active[data-v-3263c63d]{color:var(--accent)}.toc-link.h3[data-v-3263c63d]{padding-left:20px}.toc-link.h4[data-v-3263c63d]{padding-left:40px}.toc-marker[data-v-3263c63d]{position:relative;flex:none;width:13px;height:13px;margin-top:3px;border-radius:50%;background:currentColor;color:#77777e}.toc-link.h2 .toc-marker[data-v-3263c63d]{background:none}.toc-marker[data-v-3263c63d] svg{display:block;width:100%;height:100%}.toc-marker[data-v-3263c63d] .moon-disc{fill:currentColor}.toc-marker[data-v-3263c63d] .moon-crater{fill:var(--paper)}.toc-link:hover .toc-marker[data-v-3263c63d]{color:var(--ink)}.toc-link.active .toc-marker[data-v-3263c63d]{color:var(--accent)}.toc-link.h3 .toc-marker[data-v-3263c63d]{background:conic-gradient(transparent 0deg 180deg,currentColor 180deg 360deg)}.toc-link.h4 .toc-marker[data-v-3263c63d]{background:conic-gradient(from -90deg,currentColor 0deg 90deg,transparent 90deg 360deg)}.toc-link.active .toc-marker[data-v-3263c63d]:after{content:"";position:absolute;top:-5px;right:-5px;bottom:-5px;left:-5px;border-radius:50%;background:conic-gradient(var(--accent) 0deg var(--sweep),transparent var(--sweep) 360deg);-webkit-mask:radial-gradient(farthest-side,transparent calc(100% - 1.5px),#000 calc(100% - 1.5px));mask:radial-gradient(farthest-side,transparent calc(100% - 1.5px),#000 calc(100% - 1.5px));animation:toc-sweep-3263c63d .5s ease-out forwards}@keyframes toc-sweep-3263c63d{0%{--sweep: 0deg}to{--sweep: 360deg}}.toc-text[data-v-3263c63d]{min-width:0}@media(max-width:1240px){.toc-rail[data-v-3263c63d]{display:none}}:root{--ink: #111114;--ink-soft: #55555c;--ink-faint: #9a9aa2;--paper: #fbfbf9;--line: #e4e4de;--accent: #1d4fd7;--accent-soft: rgba(29, 79, 215, .08);--mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;--sans: "Inter", -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;--serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", Georgia, serif;--radius: 999px}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.85;-webkit-font-smoothing:antialiased}::selection{background:var(--accent);color:#fff}@property --sweep{syntax: "<angle>"; inherits: false; initial-value: 0deg;}@keyframes orbit-sweep{0%{--sweep: 0deg}to{--sweep: 360deg}}a{color:inherit;text-decoration:none}.topbar{position:fixed;inset:0 0 auto 0;z-index:50;display:flex;align-items:center;justify-content:space-between;padding:18px 32px;pointer-events:none}.topbar>*{pointer-events:auto}.brand{display:flex;align-items:center;gap:10px;font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-soft)}.brand-pi{display:grid;place-items:center;width:34px;height:34px;border:1.5px solid var(--ink);border-radius:50%;font-family:var(--serif);font-size:17px;color:var(--ink);transition:background .3s,color .3s,transform .3s}.brand:hover .brand-pi{background:var(--ink);color:var(--paper);transform:rotate(180deg)}.ring{position:absolute;border:1px solid var(--line);border-radius:50%;pointer-events:none}.ring-accent{border-color:transparent;border-top-color:var(--accent)}@keyframes orbit{to{transform:rotate(360deg)}}.orbit{animation:orbit 40s linear infinite}.orbit-slow{animation:orbit 90s linear infinite}.chapter-body{max-width:720px;margin:0 auto;padding:40px 24px 120px}.chapter-body h1{font-family:var(--serif);font-size:34px;line-height:1.35;margin:0 0 48px;letter-spacing:.01em}.chapter-body h2{display:flex;align-items:center;gap:14px;font-size:24px;font-weight:700;margin:96px 0 24px;padding-bottom:14px;letter-spacing:.01em;border-bottom:1px solid var(--line);scroll-margin-top:72px}.chapter-body h2:first-of-type{margin-top:48px}.head-anchor{flex:none;cursor:pointer}.chapter-body h2 .head-anchor{width:16px;height:16px;transition:transform .45s cubic-bezier(.22,1,.36,1)}.chapter-body h2 .head-anchor svg{display:block;width:100%;height:100%}.chapter-body h2 .moon-disc{fill:var(--ink)}.chapter-body h2 .moon-crater{fill:var(--paper)}.chapter-body h2:hover .head-anchor{transform:rotate(120deg)}.chapter-body h3{display:flex;align-items:center;gap:12px;font-size:18px;font-weight:700;margin:64px 0 16px;scroll-margin-top:72px}.chapter-body h3 .head-anchor{width:13px;height:13px;border-radius:50%;background:conic-gradient(transparent 0deg 180deg,var(--ink) 180deg 360deg);transition:transform .45s cubic-bezier(.22,1,.36,1)}.chapter-body h3:hover .head-anchor{transform:rotate(180deg)}.chapter-body h4{display:flex;align-items:center;gap:10px;font-size:15.5px;font-weight:700;margin:44px 0 12px;color:#33333a;scroll-margin-top:72px}.chapter-body h4 .head-anchor{width:12px;height:12px;border-radius:50%;background:conic-gradient(from -90deg,var(--accent) 0deg 90deg,transparent 90deg 360deg);transition:transform .45s cubic-bezier(.22,1,.36,1)}.chapter-body h4:hover .head-anchor{transform:rotate(90deg)}.chapter-body a.src-ref{text-decoration:none}.chapter-body a:has(>code)>code{text-decoration:underline dotted;text-decoration-color:var(--accent);text-underline-offset:3px}.chapter-body a:has(>code):hover>code{color:var(--accent)}.chapter-body a.src-ref:not(:has(>code)){color:inherit;text-decoration:underline dotted;text-decoration-color:var(--accent);text-underline-offset:3px}.chapter-body a.src-ref:hover,.chapter-body a.src-ref:hover code{color:var(--accent)}pre .hljs-comment a.src-ref:not(:has(>code)){color:inherit;text-decoration:none}pre .hljs-comment a.src-ref:hover{color:var(--accent);text-decoration:underline dotted;text-underline-offset:3px}.chapter-body p{margin:16px 0;color:#26262b}.chapter-body strong{font-weight:700}.chapter-body code{font-family:var(--mono);font-size:.85em;background:var(--accent-soft);border-radius:5px;padding:.12em .4em;color:#14349b;word-break:break-word}.chapter-body pre{position:relative;z-index:0;margin:24px 0;padding:20px 22px;background:#f2f2eb;border:1px solid var(--line);border-radius:14px;overflow-x:auto;font-size:13px;line-height:1.7;transition:width .45s cubic-bezier(.22,1,.36,1),box-shadow .3s ease,border-radius .3s ease}.chapter-body pre.expanded{z-index:20;max-width:calc(100vw - 96px);box-shadow:0 22px 60px -28px #11111459;border-radius:18px}.chapter-body pre code,.pinned-card pre code{background:none;padding:0;color:#2c2c33;font-size:inherit}.pin-btn{position:absolute;top:10px;right:10px;z-index:5;width:24px;height:24px;padding:0;border-radius:50%;border:1.5px solid #b9b9b0;background:#fbfbf9d9;color:#8a8a82;cursor:pointer;opacity:0;transition:opacity .2s,border-color .2s,color .2s}.pin-btn svg{position:absolute;top:4px;right:4px;bottom:4px;left:4px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}.chapter-body pre:hover .pin-btn{opacity:1}.pin-btn:hover{border-color:var(--accent);color:var(--accent)}pre.pinned .pin-btn{opacity:1;border-color:var(--accent);color:var(--accent)}pre .hljs-comment,pre .hljs-quote{color:#9a9aa2;font-style:italic}pre .hljs-keyword,pre .hljs-selector-tag,pre .hljs-literal{color:#1d4fd7}pre .hljs-string,pre .hljs-regexp{color:#2e7d46}pre .hljs-number,pre .hljs-symbol{color:#a5631c}pre .hljs-title,pre .hljs-title.function_{color:#111114}pre .hljs-title.class_,pre .hljs-type,pre .hljs-built_in{color:#0f7b6c}pre .hljs-attr,pre .hljs-attribute,pre .hljs-variable,pre .hljs-template-variable,pre .hljs-params{color:#55555c}.chapter-body blockquote{margin:28px 0;padding:2px 0 2px 22px;border-left:2px solid var(--line);color:var(--ink-soft);font-size:15px}.chapter-body blockquote p{color:var(--ink-soft)}.chapter-body blockquote>:first-child{margin-top:0}.chapter-body blockquote>:last-child{margin-bottom:0}.chapter-body blockquote strong{color:var(--ink)}.chapter-body blockquote.is-question{position:relative;margin:32px 0;padding:26px 28px 26px 66px;border:1px solid var(--line);border-radius:22px;background:#fff;box-shadow:0 16px 44px -30px #11111459}.chapter-body blockquote.is-question:before{content:"";position:absolute;left:24px;top:27px;width:22px;height:22px;border:1.5px solid var(--accent);border-radius:50%}.chapter-body blockquote.is-question:after{content:"?";position:absolute;left:24px;top:27px;width:22px;height:22px;display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-style:italic;font-size:13px;font-weight:700;color:var(--accent)}.chapter-body ul,.chapter-body ol{margin:16px 0 16px 24px}.chapter-body li{margin:8px 0}.chapter-body li::marker{color:var(--accent)}.chapter-body hr{border:none;height:1px;background:var(--line);margin:48px 0}@keyframes rise{0%{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}.rise{animation:rise .7s cubic-bezier(.2,.7,.2,1) both}