:root{
--bg:#faf9f5;
--panel:#f1efe8;
--fg:#141413;
--fg-soft:#4c4b45;
--muted:#7b7a72;
--line:#e4dfd5;
--line-strong:#cfc8bc;
--accent:#c15f3c;
--accent-soft:#f4e5dd;
--code-bg:#f1ede6;
--shadow:0 1px 2px rgba(20,20,19,.04),0 8px 24px rgba(20,20,19,.05);
--measure:44rem;
--sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;
--serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Songti SC","Noto Serif SC",serif;
--mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
}
:root[data-theme="dark"]{
--bg:#141413;
--panel:#1e1d1b;
--fg:#faf9f5;
--fg-soft:#cfcac2;
--muted:#87867f;
--line:#2c2926;
--line-strong:#3d3833;
--accent:#d97757;
--accent-soft:#33241d;
--code-bg:#232020;
--shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.35);
}
@media (prefers-color-scheme: dark){
:root:not([data-theme="light"]){
  --bg:#141413;
  --panel:#1e1d1b;
  --fg:#faf9f5;
  --fg-soft:#cfcac2;
  --muted:#87867f;
  --line:#2c2926;
  --line-strong:#3d3833;
  --accent:#d97757;
  --accent-soft:#33241d;
  --code-bg:#232020;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.35);
}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
margin:0;
background:var(--bg);
color:var(--fg);
font-family:var(--sans);
font-size:17px;
line-height:1.85;
letter-spacing:.01em;
-webkit-font-smoothing:antialiased;
text-rendering:optimizeLegibility;
}
a{color:var(--accent);text-decoration:none;text-underline-offset:2px}
a:hover{text-decoration:underline}

/* scroll progress */
#progress{
position:fixed;inset:0 auto auto 0;height:3px;width:0;
background:var(--accent);z-index:60;transition:width .1s linear;
}

.site-header{
position:sticky;top:0;z-index:50;
display:flex;align-items:center;gap:1rem;
padding:.75rem 1.5rem;
background:color-mix(in srgb,var(--bg) 88%,transparent);
backdrop-filter:saturate(180%) blur(12px);
border-bottom:1px solid var(--line);
font-family:var(--mono);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;
}
.brand{display:flex;align-items:center;gap:.5rem;color:var(--fg);font-weight:600}
.brand .dot{width:10px;height:10px;border-radius:50%;background:var(--accent);display:inline-block}
.site-header nav{margin-left:auto;display:flex;gap:1.1rem}
.site-header nav a{color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
.site-header nav a:hover{color:var(--fg);text-decoration:none}

.theme-toggle{
display:inline-grid;place-items:center;flex:none;
width:1.85rem;height:1.85rem;padding:0;
border:1px solid var(--line-strong);border-radius:50%;
background:transparent;color:var(--muted);cursor:pointer;
transition:color .15s,border-color .15s,background .15s;
}
.theme-toggle:hover{color:var(--fg);border-color:var(--fg-soft);background:var(--panel)}
.theme-toggle svg{width:13px;height:13px;display:block}
.theme-toggle .icon-sun{display:block}
.theme-toggle .icon-moon{display:none}
:root[data-theme="dark"] .theme-toggle .icon-sun{display:none}
:root[data-theme="dark"] .theme-toggle .icon-moon{display:block}
@media (prefers-color-scheme: dark){
:root:not([data-theme="light"]) .theme-toggle .icon-sun{display:none}
:root:not([data-theme="light"]) .theme-toggle .icon-moon{display:block}
}

.layout{
max-width:78rem;margin:0 auto;
display:grid;grid-template-columns:1fr;
padding:0 1.5rem;
}
@media (min-width:1024px){
.layout{grid-template-columns:15rem minmax(0,1fr) 4rem;gap:3rem;padding:0 2.5rem}
.toc{position:sticky;top:4.75rem;align-self:start;max-height:calc(100vh - 6rem);overflow:auto;padding:2.5rem 0 3rem}
}

/* TOC */
.toc{display:none;font-size:.83rem;line-height:1.5}
.toc h2{
font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;
color:var(--muted);margin:0 0 .85rem;font-weight:500;
}
.toc h2::before{display:none}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:toc}
.toc li{counter-increment:toc;margin:0 0 .1rem}
.toc a{
display:flex;gap:.5rem;padding:.3rem .6rem .3rem .55rem;border-left:2px solid transparent;
color:var(--fg-soft);text-decoration:none;border-radius:0 4px 4px 0;transition:.15s;
}
.toc ol a::before{
content:counter(toc,decimal-leading-zero);font-family:var(--mono);font-size:.7rem;
color:var(--muted);flex:none;padding-top:.12rem;
}
.toc a:hover{background:var(--panel);color:var(--fg)}
.toc a.active{border-left-color:var(--accent);background:var(--panel);color:var(--fg);font-weight:600}
.toc .back{margin-top:1.4rem;font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;color:var(--muted);display:block;padding-left:.6rem}
@media (min-width:1024px){ .layout .toc{display:block} }

article{max-width:var(--measure);padding:3.25rem 0 5rem;min-width:0}
@media (min-width:1024px){article{padding-top:4rem}}

.kicker{
font-family:var(--mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;
color:var(--accent);margin:0 0 1.1rem;
}
h1{
font-family:var(--serif);
font-size:clamp(1.9rem,4.6vw,2.85rem);
line-height:1.25;letter-spacing:-.01em;font-weight:600;
margin:0 0 1.5rem;
}
.meta{
display:flex;flex-wrap:wrap;gap:.4rem .9rem;align-items:center;
font-size:.82rem;color:var(--muted);
padding-bottom:1.6rem;border-bottom:1px solid var(--line);margin-bottom:2rem;
}
.meta .sep{width:1px;height:.85em;background:var(--line-strong)}
.meta strong{color:var(--fg-soft);font-weight:600}

.lede{font-size:1.08rem;color:var(--fg-soft)}
.lede p{margin:0 0 1.2rem}

h2{
font-family:var(--serif);
font-size:clamp(1.35rem,2.6vw,1.6rem);
line-height:1.4;letter-spacing:-.005em;font-weight:600;
margin:3.4rem 0 1rem;scroll-margin-top:5rem;
}
h2::before{
content:"";display:block;width:2.2rem;height:2px;background:var(--accent);
margin-bottom:.9rem;border-radius:2px;
}
h3{
font-size:1.06rem;line-height:1.6;font-weight:650;
margin:2.3rem 0 .7rem;scroll-margin-top:5rem;
display:flex;gap:.6rem;align-items:baseline;
}
h3 .n{
font-family:var(--mono);font-size:.8rem;color:var(--accent);
border:1px solid var(--line-strong);border-radius:999px;
min-width:1.6rem;height:1.6rem;display:inline-grid;place-items:center;flex:none;
padding:0 .35rem;
}
p{margin:0 0 1.15rem}
ul,ol{margin:0 0 1.2rem;padding-left:1.35rem}
li{margin:.35rem 0}
li::marker{color:var(--muted)}
strong{font-weight:650}
em{font-style:normal;color:var(--accent);font-weight:600}

code{
font-family:var(--mono);font-size:.86em;
background:var(--code-bg);border:1px solid var(--line);
border-radius:4px;padding:.1em .38em;white-space:nowrap;
}
blockquote{
margin:1.8rem 0;padding:.1rem 0 .1rem 1.1rem;
border-left:2px solid var(--line-strong);color:var(--fg-soft);
}
blockquote p:last-child{margin-bottom:0}
blockquote cite{font-style:normal;color:var(--muted);font-size:.9rem}

/* media / figures */
figure{
margin:2rem 0 2.4rem;
border:1px solid var(--line);border-radius:12px;background:var(--panel);
box-shadow:var(--shadow);overflow:hidden;
}
figure.art{
/* diagram palette (matches the article's own figure tokens) */
--bg:#faf9f5; --bg-raised:#f1efe8; --bg-panel:#ece9e0; --ink:#141413; --ink-2:#4c4b45; --ink-3:#7b7a72;
--line:#14141338; --line-soft:#1414131c;
--viz-muted:#65645e; --viz-m1:#3d3d3a; --viz-b9:#8e8c87;
--fig-focal:var(--accent);
background:var(--bg);
}
:root[data-theme="dark"] figure.art{
--bg:#141413; --bg-raised:#1a1a18; --bg-panel:#1e1d1b; --ink:#faf9f5; --ink-2:#b0aea5; --ink-3:#87867f;
--line:#faf9f529; --line-soft:#faf9f517;
--viz-muted:#8f8e87; --viz-m1:#d1cfc5; --viz-b9:#73716c;
}
@media (prefers-color-scheme: dark){
:root:not([data-theme="light"]) figure.art{
  --bg:#141413; --bg-raised:#1a1a18; --bg-panel:#1e1d1b; --ink:#faf9f5; --ink-2:#b0aea5; --ink-3:#87867f;
  --line:#faf9f529; --line-soft:#faf9f517;
  --viz-muted:#8f8e87; --viz-m1:#d1cfc5; --viz-b9:#73716c;
}
}
.art .fig-head{padding:1.05rem 1.25rem 0}
.art .fig-title{font-size:1rem;font-weight:650;line-height:1.5;color:var(--fg)}
.art .fig-sub{font-size:.8rem;line-height:1.6;color:var(--muted);margin-top:.1rem}
.art .fig-draw{padding:.9rem 1.1rem 1rem;overflow-x:auto;scrollbar-width:thin}
.art .fig-svg{display:block;width:100%;height:auto;max-width:100%}
.fig-hint{display:none;margin:0;padding:0 1.1rem .85rem;font-size:.72rem;color:var(--muted)}
@media (max-width:700px){
.art .fig-svg{min-width:34rem}
.fig-hint{display:block}
.art .fig-draw{
  background-image:linear-gradient(to right,transparent calc(100% - 34px),color-mix(in srgb,var(--bg) 75%,transparent));
  background-repeat:no-repeat;
  background-size:100% 100%;
}
}
@media (max-width:430px){
.site-header{padding:.6rem 1rem;gap:.55rem;font-size:.7rem}
.site-header nav{gap:.7rem}
}
figure img{display:block;width:100%;height:auto}
figcaption{
padding:.85rem 1.15rem;border-top:1px solid var(--line);
background:var(--bg);font-size:.84rem;line-height:1.65;color:var(--muted);
}
figcaption b{
font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;
color:var(--accent);margin-right:.5rem;font-weight:600;
}
figcaption p{margin:0 0 .5rem}
figcaption p:last-child{margin:0}

/* table */
.table-wrap{overflow-x:auto;margin:1.8rem 0 2rem;border:1px solid var(--line);border-radius:10px}
table{border-collapse:collapse;width:100%;font-size:.9rem;min-width:34rem}
thead th{
text-align:left;font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;
color:var(--muted);font-weight:500;background:var(--panel);
padding:.7rem .95rem;border-bottom:1px solid var(--line);
}
td{padding:.85rem .95rem;border-bottom:1px solid var(--line);vertical-align:top;line-height:1.6}
tbody tr:last-child td{border-bottom:0}
tbody tr:nth-child(even) td{background:color-mix(in srgb,var(--panel) 45%,transparent)}
th:first-child,td:first-child{white-space:nowrap;width:5rem}
td:first-child{font-weight:600}
th:nth-child(2){width:55%}

hr{border:0;border-top:1px solid var(--line);margin:3rem 0}

.thanks{color:var(--muted);font-style:italic;font-size:.95rem}

.related{margin-top:3.6rem;padding-top:1.8rem;border-top:1px solid var(--line)}
.related h2{font-size:.8rem;font-family:var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 1rem}
.related h2::before{display:none}
.related ul{list-style:none;padding:0;margin:0}
.related li{padding:.65rem 0;border-bottom:1px solid var(--line);display:flex;gap:1rem;align-items:baseline;font-size:.92rem}
.related li:last-child{border-bottom:0}
.related time{font-family:var(--mono);font-size:.72rem;color:var(--muted);white-space:nowrap;flex:none}
.related a{color:var(--fg)}

footer.article-foot{
margin-top:3rem;font-size:.85rem;color:var(--muted);
border-top:1px solid var(--line);padding-top:1.2rem;
}
.site-footer{
border-top:1px solid var(--line);padding:1.6rem 1.5rem;margin-top:2rem;
font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;color:var(--muted);
display:flex;flex-wrap:wrap;gap:.75rem 1.25rem;justify-content:space-between;
}
.site-footer a{color:var(--muted)}

/* mobile inline toc */
.toc-inline{
border:1px solid var(--line);background:var(--panel);border-radius:12px;
padding:1.1rem 1.25rem;margin:0 0 2.4rem;font-size:.9rem;
}
.toc-inline h2{
font-family:var(--mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;
color:var(--muted);margin:0 0 .6rem;font-weight:500;
}
.toc-inline h2::before{display:none}
.toc-inline ol{margin:0;padding-left:1.15rem}
.toc-inline li{margin:.25rem 0}
.toc-inline a{color:var(--fg-soft)}
@media (min-width:1024px){.toc-inline{display:none}}

@media print{
#progress,.site-header,.toc,.toc-inline{display:none!important}
body{background:#fff;color:#000;font-size:11pt}
.layout{display:block;max-width:none;padding:0}
article{max-width:none;padding:0}
figure{break-inside:avoid;box-shadow:none}
h2,h3{break-after:avoid}
a{color:#000;text-decoration:underline}
}
/* ===================== 首页 / 列表页 ===================== */

.wrap{max-width:52rem;margin:0 auto;padding:3.5rem 1.5rem 5rem}
.intro{font-size:1.05rem;color:var(--fg-soft);margin:0 0 2.6rem;max-width:38rem}
.intro p{margin:0 0 .8rem}
.intro a{color:var(--accent)}

.section-label{
  display:flex;align-items:center;gap:.8rem;margin:0 0 1.2rem;
  font-family:var(--mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);
}
.section-label::after{content:"";flex:1;height:1px;background:var(--line)}

.cards{display:grid;gap:1rem}
.card{
  display:block;padding:1.35rem 1.5rem;border:1px solid var(--line);border-radius:14px;
  background:var(--panel);color:var(--fg);transition:border-color .16s,transform .16s,box-shadow .16s;
}
.card:hover{text-decoration:none;border-color:var(--line-strong);transform:translateY(-1px);box-shadow:var(--shadow)}
.card-meta{
  display:flex;flex-wrap:wrap;gap:.35rem .8rem;align-items:center;
  font-family:var(--mono);font-size:.72rem;letter-spacing:.04em;color:var(--muted);margin:0 0 .55rem;
}
.card-meta .sep{width:3px;height:3px;border-radius:50%;background:var(--line-strong)}
.card h2{font-family:var(--serif);font-size:1.24rem;line-height:1.45;font-weight:600;margin:0 0 .45rem;letter-spacing:0}
.card h2::before{display:none}
.card p.desc{margin:0;color:var(--fg-soft);font-size:.93rem;line-height:1.7}
.card-foot{display:flex;flex-wrap:wrap;gap:.45rem;align-items:center;margin-top:.9rem}
.card .go{margin-left:auto;font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;color:var(--accent)}
.tag{
  font-size:.72rem;line-height:1.6;padding:.15rem .55rem;border-radius:999px;
  border:1px solid var(--line-strong);color:var(--muted);
}

/* 标签云 */
.tag-cloud{display:flex;flex-wrap:wrap;gap:.5rem;margin:0 0 3rem}
.tag-cloud a{
  display:inline-flex;align-items:center;gap:.45rem;padding:.3rem .7rem;border-radius:999px;
  border:1px solid var(--line-strong);color:var(--fg-soft);font-size:.85rem;
}
.tag-cloud a:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}
.tag-cloud a span{font-family:var(--mono);font-size:.7rem;color:var(--muted)}

.tag-section{margin:0 0 2.4rem}
.tag-section h2{margin-top:1.6rem}
.post-list{list-style:none;padding:0;margin:0;border-top:1px solid var(--line)}
.post-list li{display:flex;gap:1rem;align-items:baseline;padding:.7rem 0;border-bottom:1px solid var(--line);font-size:.95rem}
.post-list time{font-family:var(--mono);font-size:.72rem;color:var(--muted);white-space:nowrap;flex:none}
.post-list a{color:var(--fg)}
.post-list a:hover{color:var(--accent);text-decoration:none}

/* 文章页脚 */
.article-foot p{margin:0 0 .5rem}
.article-foot .source{font-size:.85rem;color:var(--muted);word-break:break-all}
.article-foot .source a{color:var(--muted)}
.article-foot .colophon{font-size:.8rem;color:var(--muted)}
.post-nav{
  display:flex;flex-wrap:wrap;gap:.75rem;margin-top:1.6rem;
  border-top:1px solid var(--line);padding-top:1.2rem;
}
.post-nav a{
  flex:1 1 14rem;display:flex;flex-direction:column;gap:.2rem;padding:.85rem 1rem;
  border:1px solid var(--line);border-radius:10px;color:var(--fg);font-size:.92rem;line-height:1.55;
}
.post-nav a:hover{border-color:var(--line-strong);text-decoration:none;background:var(--panel)}
.post-nav a span{font-family:var(--mono);font-size:.7rem;letter-spacing:.06em;color:var(--muted)}
.post-nav .next{text-align:right}

.notfound{max-width:36rem}
@media (max-width:700px){
  .wrap{padding:2.6rem 1.2rem 4rem}
  .card{padding:1.1rem 1.15rem}
  .post-nav a{flex:1 1 100%}
}

/* 页脚吸底 */
body{display:flex;flex-direction:column;min-height:100vh}
.wrap,.layout{flex:1 0 auto;width:100%}

/* ===================== 内容类型 / 筛选 ===================== */

.kind{
  display:inline-flex;align-items:center;padding:.05rem .45rem;border-radius:999px;
  font-family:var(--mono);font-size:.66rem;letter-spacing:.06em;line-height:1.7;
  border:1px solid var(--line-strong);color:var(--muted);white-space:nowrap;
}
.kind--original{border-color:var(--accent);color:var(--accent);background:color-mix(in srgb,var(--accent) 8%,transparent)}

.list-head{display:flex;flex-wrap:wrap;gap:.9rem 1.2rem;align-items:center;margin-bottom:1.2rem}
.list-head .section-label{flex:1 1 12rem;margin:0}
.list-head .section-label::after{display:none}
.filters{display:flex;flex-wrap:wrap;gap:.4rem}
.chip{
  font-family:var(--sans);font-size:.78rem;line-height:1.6;padding:.2rem .7rem;border-radius:999px;
  border:1px solid var(--line-strong);background:transparent;color:var(--muted);cursor:pointer;
  transition:color .15s,border-color .15s,background .15s;
}
.chip:hover{color:var(--fg);border-color:var(--fg-soft)}
.chip.is-active{background:var(--fg);border-color:var(--fg);color:var(--bg)}
.empty{margin:2rem 0;color:var(--muted);font-size:.92rem}
.card.is-hidden{display:none}

/* 关于页 */
.about{max-width:44rem}
.about-links{display:flex;flex-wrap:wrap;gap:1.2rem;margin:0 0 2rem}
.about-links a{font-family:var(--mono);font-size:.8rem;letter-spacing:.04em}
.about .colophon-note{color:var(--muted);font-size:.9rem}
.about .intro strong{color:var(--fg)}

/* ===================== 代码块 / 提示框 ===================== */

pre{
  margin:1.5rem 0;padding:1rem 1.15rem;overflow-x:auto;
  background:var(--code-bg);border:1px solid var(--line);border-radius:10px;
  font-family:var(--mono);font-size:.82rem;line-height:1.8;color:var(--fg-soft);
  -webkit-overflow-scrolling:touch;
}
pre code{
  background:none;border:0;padding:0;white-space:pre;
  font-size:inherit;color:inherit;
}
pre .tag{
  display:block;margin:-.2rem 0 .55rem;padding:0;border:0;
  font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);
}

.callout{
  margin:1.5rem 0;padding:.85rem 1.15rem;
  border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:8px;background:color-mix(in srgb,var(--accent) 5%,transparent);
  font-size:.96rem;color:var(--fg-soft);
}
.callout p{margin:0}
.callout p + p{margin-top:.6rem}
.callout .label{
  display:block;margin-bottom:.2rem;
  font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);
}

/* 宽表：不锁首列宽度 */
.table-wrap--wide th:first-child,
.table-wrap--wide td:first-child{white-space:normal;width:auto;font-weight:650}
.table-wrap--wide th:nth-child(2){width:auto}
.table-wrap--wide th:first-child:nth-last-child(3){width:22%}
.table-wrap--wide th:nth-child(2):nth-last-child(2){width:30%}
.table-wrap--wide td{font-size:.86rem}

/* 图内文字与弱化标注 */
.art .fig-svg text{font-family:var(--sans)}
.dim{color:var(--muted);font-size:.9em}