@property --scroll-line{syntax:"<color>";inherits:true;initial-value:#ded8ca}:root{color-scheme:light;--bg:#f8f6f1;--bg-sidebar:#f2efe8;--surface:#fdfcfa;--surface-frost:#fdfcfad1;--text:#14161a;--text-soft:#3a3f47;--muted:#82868f;--muted-soft:#a8abb2;--border:#e4e0d5;--border-soft:#ece8de;--accent:#3b5bd0;--accent-quiet:#6d7fb8;--accent-strong:#2440b6;--accent-wash:#3b5bd012;--font-sans:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;--font-mono:"JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;--ease:cubic-bezier(.22, .61, .36, 1);--sidebar-width:256px;--rail:2.75rem;--accent-dark:var(--accent-strong);--parchment:var(--bg);--black:20, 22, 26;--gray:130, 134, 143;--gray-light:228, 224, 213;--gray-dark:58, 63, 71;--box-shadow:0 1px 2px #14161a0a;--scroll-line:#ded8ca}*,:before,:after{box-sizing:border-box}html{scroll-timeline:--page-scroll block;background-color:var(--bg);-webkit-text-size-adjust:100%}body{background-color:var(--bg);color:var(--text-soft);font-family:var(--font-sans);text-align:left;word-wrap:break-word;overflow-wrap:break-word;-webkit-font-smoothing:antialiased;margin:0;padding:0;font-size:17px;line-height:1.7;overflow-x:hidden}body:before,body:after{content:"";z-index:-1;pointer-events:none;position:fixed;inset:0}body:before{background-image:linear-gradient(90deg,#14161a08 1px,#0000 1px),linear-gradient(#14161a08 1px,#0000 1px);background-size:32px 32px;mask-image:radial-gradient(125% 85% at 50% 0,#000 0%,#0000 78%)}body:after{background:radial-gradient(55% 40% at 82% -5%,#3b5bd00e,#0000 72%),radial-gradient(45% 35% at 8% 2%,#cba86c12,#0000 70%)}.site{align-items:stretch;min-height:100vh;display:flex;position:relative}.site-main{flex-direction:column;flex:1;min-width:0;display:flex}main{flex:1;width:760px;max-width:100%;margin:0 auto;padding:4.5rem 2.5rem 5rem}main.wide{width:1120px}.mobile-bar,.backdrop{display:none}h1,h2,h3,h4,h5,h6{color:var(--text);letter-spacing:-.015em;margin:0 0 .6rem;font-weight:700;line-height:1.22}h1{font-size:clamp(2rem,4.4vw,2.9rem)}h2{font-size:1.65rem}h3{font-size:1.3rem}h4{font-size:1.1rem}h5{font-size:1rem}p{margin:0 0 1.1em}strong,b{color:var(--text);font-weight:700}a{color:var(--accent-quiet);text-decoration-color:color-mix(in srgb, var(--accent-quiet) 35%, transparent);text-underline-offset:3px;transition:color .2s var(--ease), text-decoration-color .2s var(--ease)}a:hover{color:var(--accent-strong);text-decoration-color:currentColor}.label{font-family:var(--font-mono);letter-spacing:.18em;text-transform:uppercase;color:var(--muted);font-size:.63rem;font-weight:500;display:block}.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}.hairline{border:0;border-top:1px solid var(--border-soft);margin:0}.pulse{background:var(--accent);width:5px;height:5px;animation:pulse 2.8s var(--ease) infinite;border-radius:50%;display:inline-block}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.8)}}.prose{border-left:2px solid var(--scroll-line);color:var(--text-soft);padding-left:1.6rem;animation:linear both parchment-line --page-scroll;animation-range:0% 100%}.prose p{margin-bottom:1.7em}.prose h2,.prose h3{margin-top:2.2em}@keyframes parchment-line{0%{--scroll-line:#ded8ca}to{--scroll-line:#3b5bd0}}blockquote{border-left:2px solid var(--accent);color:var(--text);margin:2em 0;padding:0 0 0 1.4rem;font-size:1.1rem}code{border:1px solid var(--border-soft);background-color:var(--surface);font-family:var(--font-mono);border-radius:3px;padding:.1em .35em;font-size:.85em}pre{border:1px solid var(--border);border-radius:4px;padding:1.4em;font-size:.9rem;overflow-x:auto}pre>code{all:unset;font-family:var(--font-mono)}hr{border:0;border-top:1px solid var(--border-soft)}img{border-radius:4px;max-width:100%;height:auto}table{border-collapse:collapse;width:100%}th,td{border-bottom:1px solid var(--border-soft);text-align:left;padding:.5rem .6rem}input,textarea,select,button{font-family:inherit}textarea,input{font-size:16px}.card{border:1px solid var(--border);background:var(--surface);color:inherit;border-radius:4px;padding:1.2rem 1.3rem;text-decoration:none;display:block;position:relative}.glass{background:var(--surface-frost);-webkit-backdrop-filter:blur(12px)saturate(140%);border:1px solid var(--border-soft)}.rise{animation:rise .55s var(--ease) both}@keyframes rise{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}html.reveal-ready [data-reveal]{opacity:0;transition:opacity .5s var(--ease), transform .5s var(--ease);transform:translateY(12px)}html.reveal-ready [data-reveal].is-visible{opacity:1;transform:none}.back-to-top{z-index:30;width:38px;height:38px;color:var(--muted);font:inherit;cursor:pointer;opacity:0;pointer-events:none;transition:opacity .3s var(--ease), transform .3s var(--ease), color .2s var(--ease);border-radius:2px;padding:0;font-size:.9rem;position:fixed;bottom:4.6rem;right:1.6rem;transform:translateY(6px)}.back-to-top:hover{color:var(--accent)}.back-to-top.is-visible{opacity:1;pointer-events:auto;transform:translateY(0)}.ask-fab{z-index:30;border:1px solid var(--accent);background:var(--accent);color:#fff;font-family:var(--font-mono);letter-spacing:.06em;transition:background-color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);border-radius:999px;align-items:center;gap:.5rem;padding:.55rem .95rem;font-size:.72rem;text-decoration:none;display:inline-flex;position:fixed;bottom:1.6rem;right:1.6rem;box-shadow:0 8px 24px #3b5bd047}.ask-fab:hover{background:var(--accent-strong);border-color:var(--accent-strong);transform:translateY(-2px);box-shadow:0 12px 28px #3b5bd05c}.ask-fab-spark{animation:pulse 2.8s var(--ease) infinite;font-size:.9rem;line-height:1}@media (width<=1199px){main,main.wide{width:100%;padding:3.5rem 2rem 4rem}}@media (width<=900px){.mobile-bar{z-index:15;border-width:0 0 1px;justify-content:space-between;align-items:center;gap:.8rem;padding:.7rem 1.2rem;display:flex;position:sticky;top:0}.mobile-bar .brand-line{color:var(--text);align-items:baseline;gap:.5rem;font-weight:700;text-decoration:none;display:flex}.mobile-bar button{border:1px solid var(--border);color:var(--muted);font-family:var(--font-mono);letter-spacing:.16em;text-transform:uppercase;cursor:pointer;transition:color .2s var(--ease), border-color .2s var(--ease);background:0 0;border-radius:2px;padding:.3rem .7rem;font-size:.65rem}.mobile-bar button:hover{color:var(--accent);border-color:var(--accent-quiet)}.backdrop{z-index:19;animation:fade-in .2s var(--ease);background:#14161a47;border:0;padding:0;display:none;position:fixed;inset:0}body.sidebar-open .backdrop{display:block}@keyframes fade-in{0%{opacity:0}to{opacity:1}}}@media (width<=767px){body{font-size:16px}main,main.wide{padding:2.25rem 1.25rem 3rem}.back-to-top{bottom:4.2rem;right:1rem}.ask-fab{bottom:1rem;right:1rem}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.001ms!important;animation-duration:.001ms!important;animation-iteration-count:1!important}.prose{border-left-color:var(--accent)}html.reveal-ready [data-reveal]{opacity:1;transform:none}}.sr-only{clip:rect(1px, 1px, 1px, 1px);clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:0;padding:0;overflow:hidden;position:absolute!important}footer[data-astro-cid-jo6i4kqk]{width:760px;max-width:100%;margin:0 auto;padding:3rem 2.5rem 4rem}footer[data-astro-cid-jo6i4kqk].wide{width:1120px}.row[data-astro-cid-jo6i4kqk]{border-top:1px solid var(--border-soft);letter-spacing:.14em;text-transform:uppercase;color:var(--muted-soft);align-items:center;gap:.6rem;padding-top:1.1rem;font-size:.63rem;display:flex}.grow[data-astro-cid-jo6i4kqk]{flex:1}.sep[data-astro-cid-jo6i4kqk]{color:var(--border)}.row[data-astro-cid-jo6i4kqk] a[data-astro-cid-jo6i4kqk]{color:var(--muted);text-decoration:none}.row[data-astro-cid-jo6i4kqk] a[data-astro-cid-jo6i4kqk]:hover{color:var(--accent)}.note[data-astro-cid-jo6i4kqk]{color:var(--muted-soft);margin:.7rem 0 0;font-size:.75rem}@media (width<=1199px){footer[data-astro-cid-jo6i4kqk],footer[data-astro-cid-jo6i4kqk].wide{width:100%;padding:2.5rem 2rem 3.5rem}}@media (width<=767px){footer[data-astro-cid-jo6i4kqk]{padding:2rem 1.25rem 3rem}.row[data-astro-cid-jo6i4kqk]{flex-wrap:wrap;row-gap:.4rem}.grow[data-astro-cid-jo6i4kqk]{flex-basis:100%}}.sidebar[data-astro-cid-wv7whodv]{width:var(--sidebar-width);z-index:10;border-right:1px solid var(--border);background:#f0ece3d1;flex-shrink:0;height:100vh;position:sticky;top:0;overflow-y:auto}.inner[data-astro-cid-wv7whodv]{flex-direction:column;min-height:100%;padding:1.9rem 1.1rem 1.4rem;display:flex}.brand[data-astro-cid-wv7whodv]{grid-template-columns:auto 1fr;align-items:center;gap:.3rem .6rem;margin:0 .35rem;text-decoration:none;display:grid}.brand-mark[data-astro-cid-wv7whodv]{border:1px solid var(--accent-quiet);width:11px;height:11px;transition:transform .35s var(--ease);border-radius:50%;position:relative}.brand-mark[data-astro-cid-wv7whodv]:after{content:"";background:var(--accent);border-radius:50%;position:absolute;inset:3px}.brand[data-astro-cid-wv7whodv]:hover .brand-mark[data-astro-cid-wv7whodv]{transform:scale(1.25)}.brand-name[data-astro-cid-wv7whodv]{color:var(--text);letter-spacing:-.01em;font-size:1.02rem;font-weight:700}.brand-sub[data-astro-cid-wv7whodv]{letter-spacing:.2em;color:var(--muted-soft);grid-column:2;font-size:.56rem}.status[data-astro-cid-wv7whodv]{align-items:center;gap:.45rem;margin:1.1rem .35rem 2.2rem;display:flex}.status[data-astro-cid-wv7whodv] .label[data-astro-cid-wv7whodv]{letter-spacing:.22em;color:var(--muted);font-size:.56rem}.group-label[data-astro-cid-wv7whodv]{color:var(--muted-soft);margin:0 .75rem .7rem;font-size:.56rem}.nav[data-astro-cid-wv7whodv]{flex-direction:column;gap:1px;display:flex}.shelf[data-astro-cid-wv7whodv]{flex-direction:column;gap:1px;margin-top:2.2rem;display:flex}.nav[data-astro-cid-wv7whodv] .nav-item,.shelf[data-astro-cid-wv7whodv] .shelf-item{color:var(--text-soft);transition:background-color .25s var(--ease), transform .15s var(--ease);border-radius:3px;align-items:baseline;padding:.44rem .75rem;text-decoration:none;display:grid;position:relative}.nav[data-astro-cid-wv7whodv] .nav-item{grid-template-columns:1.55rem 1fr auto}.shelf[data-astro-cid-wv7whodv] .shelf-item{grid-template-columns:1.55rem 1fr}.nav[data-astro-cid-wv7whodv] .nav-item:hover,.shelf[data-astro-cid-wv7whodv] .shelf-item:hover{background-color:#14161a08}.nav[data-astro-cid-wv7whodv] .nav-item.active{background-color:var(--accent-wash)}.line[data-astro-cid-wv7whodv]{background:var(--accent);transform-origin:50%;width:1px;height:1.1rem;transition:transform .3s var(--ease);position:absolute;top:50%;left:0;transform:translateY(-50%)scaleY(0)}.nav[data-astro-cid-wv7whodv] .nav-item:hover .line[data-astro-cid-wv7whodv],.nav[data-astro-cid-wv7whodv] .nav-item.active .line[data-astro-cid-wv7whodv],.shelf[data-astro-cid-wv7whodv] .shelf-item:hover .line[data-astro-cid-wv7whodv]{transform:translateY(-50%)scaleY(1)}.nav-index[data-astro-cid-wv7whodv]{color:var(--muted-soft);transition:transform .3s var(--ease), color .25s var(--ease);font-size:.62rem}.nav-zh[data-astro-cid-wv7whodv],.shelf-name[data-astro-cid-wv7whodv]{transition:transform .3s var(--ease), color .25s var(--ease);font-size:.92rem}.nav-en[data-astro-cid-wv7whodv]{letter-spacing:.14em;text-transform:uppercase;color:var(--muted-soft);opacity:0;transition:opacity .3s var(--ease);font-size:.56rem}.nav[data-astro-cid-wv7whodv] .nav-item:hover .nav-index[data-astro-cid-wv7whodv],.nav[data-astro-cid-wv7whodv] .nav-item.active .nav-index[data-astro-cid-wv7whodv]{color:var(--accent-quiet);transform:translate(2px)}.nav[data-astro-cid-wv7whodv] .nav-item:hover .nav-zh[data-astro-cid-wv7whodv],.shelf[data-astro-cid-wv7whodv] .shelf-item:hover .shelf-name[data-astro-cid-wv7whodv]{color:var(--text);transform:translate(4px)}.nav[data-astro-cid-wv7whodv] .nav-item.active .nav-zh[data-astro-cid-wv7whodv]{color:var(--text);font-weight:700}.nav[data-astro-cid-wv7whodv] .nav-item:hover .nav-en[data-astro-cid-wv7whodv],.nav[data-astro-cid-wv7whodv] .nav-item.active .nav-en[data-astro-cid-wv7whodv]{opacity:1}.shelf[data-astro-cid-wv7whodv] .shelf-item:active{transform:translateY(1px)}.shelf-glyph[data-astro-cid-wv7whodv]{color:var(--muted-soft);transition:color .25s var(--ease);font-size:.68rem}.shelf-name[data-astro-cid-wv7whodv]{color:var(--muted);font-size:.84rem}.shelf[data-astro-cid-wv7whodv] .shelf-item:hover .shelf-glyph[data-astro-cid-wv7whodv],.shelf[data-astro-cid-wv7whodv] .shelf-item.active .shelf-glyph[data-astro-cid-wv7whodv]{color:var(--accent)}.shelf[data-astro-cid-wv7whodv] .shelf-item.active .shelf-name[data-astro-cid-wv7whodv]{color:var(--text)}.foot[data-astro-cid-wv7whodv]{border-top:1px solid var(--border-soft);letter-spacing:.14em;text-transform:uppercase;color:var(--muted-soft);align-items:center;gap:.5rem;margin:auto .85rem 0;padding-top:1rem;font-size:.6rem;display:flex}.foot[data-astro-cid-wv7whodv] a[data-astro-cid-wv7whodv]{color:var(--muted);text-decoration:none}.foot[data-astro-cid-wv7whodv] a[data-astro-cid-wv7whodv]:hover{color:var(--accent)}.foot[data-astro-cid-wv7whodv] span[data-astro-cid-wv7whodv][aria-hidden]{color:var(--border)}@media (width<=900px){.sidebar[data-astro-cid-wv7whodv]{z-index:20;background:var(--bg-sidebar);transition:transform .28s var(--ease);position:fixed;top:0;left:0;transform:translate(-100%)}body.sidebar-open .sidebar[data-astro-cid-wv7whodv]{transform:translate(0)}}