:root{
  --font-sans:"Inter","IBM Plex Sans",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB",sans-serif;
  --font-serif:"Source Serif Pro","Lora",Georgia,"Songti SC","STSong",serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular",Menlo,Consolas,monospace;
  --paper:#fdfcf9;--ink:#181821;--ink-soft:#2c2c38;--ink-mute:#5a5a68;--ink-faint:#7e7e8b;
  --rule:#e4dfd5;--tint:#f3efe7;--accent:#1f6feb;--accent-soft:#e8f0fe;
  --panel:#fffefb;--code-bg:#f5f1e8;--mark:#fff3d6;
  --radius:10px;--shadow:0 1px 2px rgba(24,24,33,.04),0 8px 24px rgba(24,24,33,.05);
  --max:1180px;
  --header-h:68px;--shell-width:1440px;--fs-sm:.9375rem;--fs-xs:.8125rem;--easing:cubic-bezier(.2,.7,.2,1);
  --hue-1:#1f6feb;--hue-2:#1f8a70;--hue-4:#6d28d9;
  --grad-1:linear-gradient(135deg,#1f6feb 0%,#4f8ef7 55%,#82b6ff 100%);
  --grad-brand:linear-gradient(120deg,#1f6feb 0%,#6d28d9 100%);
  --radius-sm:4px;--radius-lg:18px;
  --shadow-3:0 18px 48px rgba(50,35,20,.13),0 36px 80px rgba(50,35,20,.1);
  --glass-border:color-mix(in srgb,var(--ink) 6%,transparent);
}
html[data-theme=dark]{
  --paper:#0a0a0f;--ink:#f3f4f8;--ink-soft:#c9ccd6;--ink-mute:#8b8fa1;--ink-faint:#6b7185;
  --rule:rgba(255,255,255,.1);--tint:#15161f;--accent:#818cf8;--accent-soft:rgba(129,140,248,.16);
  --panel:#12121a;--code-bg:#15161f;--mark:#3a3018;
  --shadow:0 1px 2px rgba(0,0,0,.35),0 10px 30px rgba(0,0,0,.35);
  --shadow-3:0 20px 60px rgba(0,0,0,.55),0 36px 90px rgba(0,0,0,.45);
  --glass-border:rgba(255,255,255,.12);
  --hue-1:#6e8bff;--hue-2:#2dd4bf;--hue-4:#a78bfa;
  --grad-brand:linear-gradient(120deg,#a78bfa 0%,#6e8bff 48%,#22d3ee 100%);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;padding:0}
body{
  background:var(--paper);color:var(--ink);
  font-family:var(--font-sans);font-size:17px;line-height:1.72;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
img{max-width:100%;height:auto}
button{font:inherit;color:inherit}
code,kbd,samp,pre{font-family:var(--font-mono)}
.shell{max-width:var(--max);margin:0 auto;padding:0 24px}
.skip-link{position:absolute;left:-9999px;top:8px;background:var(--ink);color:var(--paper);padding:8px 14px;border-radius:6px;z-index:99}
.skip-link:focus{left:8px}

/* header — same rules as the blog's site.min.css */
.site-header{position:sticky;top:0;z-index:50;height:var(--header-h);background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:saturate(200%) blur(18px);-webkit-backdrop-filter:saturate(200%) blur(18px);border-bottom:1px solid var(--rule);transition:box-shadow .2s var(--easing)}
.site-header.scrolled{box-shadow:var(--shadow)}
.site-header::after{content:"";position:absolute;bottom:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent 5%,color-mix(in srgb,var(--hue-1,#1f6feb) 30%,transparent) 30%,color-mix(in srgb,var(--hue-4,#6d28d9) 30%,transparent) 70%,transparent 95%);opacity:.5}
:root[data-theme=dark] .site-header{background:color-mix(in srgb,var(--paper) 72%,transparent)}
:root[data-theme=dark] .site-header::after{opacity:.7}
.site-header .shell{max-width:var(--shell-width);padding:0 36px}
.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:baseline;gap:.35em;color:var(--ink);font-family:var(--font-serif);font-weight:700;font-size:1.45rem;letter-spacing:-.015em;white-space:nowrap;text-decoration:none}
.brand:hover{text-decoration:none}
.brand .brand-mark{display:inline-block;width:28px;height:28px;margin-right:6px;background:var(--grad-1);border-radius:7px;position:relative;vertical-align:middle;transition:transform .3s var(--easing),box-shadow .3s var(--easing)}
.brand .brand-mark::after{content:"ck";position:absolute;inset:0;display:grid;place-items:center;color:#fff;font-family:var(--font-serif);font-size:13px;font-weight:700;letter-spacing:-.04em}
.brand .brand-dot{transition:color .2s}
.brand:hover .brand-dot{color:var(--accent,var(--hue-1))}
.nav{display:flex;align-items:center;gap:6px;flex:1;justify-content:start}
.nav a{position:relative;font-family:var(--font-sans);font-size:var(--fs-sm);color:var(--ink-soft);padding:8px 14px;border-radius:999px;font-weight:500;letter-spacing:.005em;text-decoration:none;transition:color .2s var(--easing)}
.nav a:hover{color:var(--ink);text-decoration:none}
.nav a.active{color:var(--ink);font-weight:600}
.nav a::after{content:"";position:absolute;left:10px;right:10px;bottom:5px;height:2px;background:var(--grad-brand);border-radius:2px;transform:scaleX(0);transform-origin:left center;transition:transform .28s var(--easing)}
.nav a.active::after{transform:scaleX(1)}
.header-tools{display:flex;align-items:center;gap:6px}
.icon-btn{width:38px;height:38px;display:grid;place-items:center;border:0;border-radius:999px;background:transparent;color:var(--ink-soft);cursor:pointer;transition:background .2s var(--easing),color .2s,transform .2s var(--easing)}
.icon-btn:hover{background:var(--tint);color:var(--ink)}
.icon-btn svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform .3s var(--easing)}
.icon-btn[data-theme-toggle]:hover svg{transform:rotate(-22deg)}
.lang-switch{font-family:var(--font-sans);font-size:.78rem;font-weight:700;letter-spacing:.06em;padding:6px 12px;border-radius:999px;border:1px solid var(--rule);color:var(--ink-soft);text-decoration:none;transition:background .2s var(--easing),color .2s,border-color .2s}
.lang-switch:hover{background:var(--accent);color:#fff;border-color:transparent;text-decoration:none}
.menu-toggle{display:none}
@media(hover:hover) and (pointer:fine){
  .nav a:hover::after{transform:scaleX(1)}
  .icon-btn:hover{transform:translateY(-1px) scale(1.06)}
  .icon-btn:active{transform:translateY(0) scale(.95)}
  .brand:hover .brand-mark{transform:rotate(-8deg) scale(1.08);box-shadow:0 5px 16px -5px color-mix(in srgb,var(--hue-1,#1f6feb) 60%,transparent)}
}

.drawer{position:fixed;top:0;bottom:0;right:0;left:0;width:100%;background:var(--paper);z-index:100;transform:translateX(100%);transition:transform .3s var(--easing),visibility 0s linear .3s;visibility:hidden;display:flex;flex-direction:column;padding:24px 28px;overflow-y:auto;overscroll-behavior:contain}
.drawer.open{transform:translateX(0);visibility:visible;transition:transform .3s var(--easing),visibility 0s linear 0s}
.drawer:not(.open){pointer-events:none}
.drawer-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:32px;padding-bottom:8px;border-bottom:1px solid var(--rule)}
.drawer nav{display:flex;flex-direction:column;gap:4px}
.drawer nav a{font-family:var(--font-serif);font-size:1.15rem;font-weight:600;padding:14px 4px;border-bottom:1px solid var(--rule);color:var(--ink);text-decoration:none}
.drawer nav a:hover{color:var(--accent);text-decoration:none}
.drawer nav a.active{color:var(--accent)}
.drawer-backdrop{display:none}
.drawer{background:color-mix(in srgb,var(--paper) 80%,transparent);-webkit-backdrop-filter:saturate(150%) blur(22px);backdrop-filter:saturate(150%) blur(22px);border:1px solid var(--glass-border)}

/* search */
.search-overlay{position:fixed;inset:0;z-index:200;background:rgba(20,20,30,.5);backdrop-filter:blur(6px);display:none;padding-top:12vh;opacity:0;transition:opacity .2s var(--easing)}
.search-overlay.open{display:block;opacity:1}
.search-modal{width:92%;max-width:640px;margin:0 auto;background:var(--paper);border:1px solid var(--rule);border-radius:var(--radius-lg);box-shadow:var(--shadow-3);overflow:hidden}
:root[data-theme=dark] .search-modal{background:color-mix(in srgb,var(--paper) 80%,transparent);backdrop-filter:saturate(150%) blur(22px);border:1px solid var(--glass-border)}
.search-input-row{display:flex;align-items:center;gap:12px;padding:16px 22px;border-bottom:1px solid var(--rule)}
.search-input-row svg{width:18px;height:18px;color:var(--ink-faint);fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.search-input-row input{flex:1;min-width:0;border:0;outline:none;background:transparent;font-size:1.1rem;font-family:var(--font-sans);color:var(--ink)}
.search-input-row input::placeholder{color:var(--ink-faint)}
.search-input-row input::-webkit-search-cancel-button,.search-input-row input::-webkit-search-decoration{-webkit-appearance:none;appearance:none}
.search-input-row .kbd{display:none;font-family:var(--font-mono);font-size:.75rem;padding:3px 8px;border:1px solid var(--rule);border-radius:4px;color:var(--ink-faint)}
.search-results{max-height:60vh;overflow-y:auto;padding:8px}
.search-results .result{display:block;position:relative;padding:12px 14px;border-radius:10px;text-decoration:none;transition:background .15s var(--easing)}
.search-results .result:hover,.search-results .result.active{background:color-mix(in srgb,var(--accent) 10%,transparent)}
.search-results .result.active{padding-left:18px}
.search-results .result::before{content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;border-radius:3px;background:var(--grad-brand);transform:scaleY(0);transition:transform .2s var(--easing)}
.search-results .result:hover::before,.search-results .result.active::before{transform:scaleY(1)}
.r-meta{display:flex;gap:10px;align-items:center;font-size:11px;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.12em;margin-bottom:6px;font-family:var(--font-sans)}
.r-series{color:var(--accent);font-family:var(--font-mono);font-weight:700;font-size:11px;letter-spacing:.04em;text-transform:none}
.result .title{font-family:var(--font-serif);font-weight:600;color:var(--ink);display:block;margin-bottom:2px;transition:color .15s var(--easing)}
.search-results .result:hover .title,.search-results .result.active .title{color:var(--accent)}
.result .excerpt{font-size:var(--fs-sm);color:var(--ink-mute);display:block;line-height:1.45}
.result mark{background:color-mix(in srgb,var(--accent) 25%,transparent);color:inherit;padding:0 2px;border-radius:2px}
.search-empty{padding:22px 16px;color:var(--ink-mute);font-size:14px;text-align:center}

/* main */
.kb-main{min-height:calc(100vh - 64px - 78px);padding:44px 0 72px}
.eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-faint);margin:0 0 10px}
.kb-title{font-family:var(--font-serif);font-weight:600;font-size:clamp(30px,4vw,44px);line-height:1.18;letter-spacing:-.015em;margin:0 0 12px}
.lede{font-size:17px;color:var(--ink-mute);max-width:64ch;margin:0 0 26px}
.badge{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;padding:3px 9px;border-radius:999px;background:var(--tint);color:var(--ink-mute);border:1px solid var(--rule)}
.badge.ok{background:var(--accent-soft);color:var(--accent);border-color:transparent}
.badge.warn{background:var(--mark);color:#8a5a00;border-color:transparent}
html[data-theme=dark] .badge.warn{color:#ffd480}

.stats{display:flex;gap:28px;flex-wrap:wrap;padding:18px 0 24px;border-bottom:1px solid var(--rule);margin-bottom:30px}
.stat b{display:block;font-size:24px;font-family:var(--font-serif);font-weight:600;line-height:1.2}
.stat span{font-size:12px;color:var(--ink-faint);letter-spacing:.04em}

.chapter{margin:0 0 34px}
.chapter-head{display:flex;align-items:baseline;gap:12px;margin:0 0 8px}
.chapter-num{font-family:var(--font-mono);font-size:12px;color:var(--ink-faint)}
.chapter-head h2{font-family:var(--font-serif);font-size:21px;font-weight:600;margin:0}
.chapter-desc{font-size:14px;color:var(--ink-mute);margin:0 0 10px}
.sec-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--rule)}
.sec-row{display:grid;grid-template-columns:58px 1fr auto;gap:14px;align-items:center;padding:11px 4px;border-bottom:1px solid var(--rule)}
.sec-row:hover{background:var(--tint)}
.sec-row a{color:var(--ink);font-weight:500;font-size:15.5px}
.sec-row a:hover{text-decoration:none;color:var(--accent)}
.sec-idx{font-family:var(--font-mono);font-size:12px;color:var(--ink-faint)}
.sec-meta{font-size:12px;color:var(--ink-faint);white-space:nowrap}

/* auth + panel */
.auth-wrap{display:grid;grid-template-columns:minmax(0,440px) minmax(0,1fr);gap:56px;align-items:start;max-width:980px;margin:24px auto 0}
.auth-card{background:var(--panel);border:1px solid var(--rule);border-radius:var(--radius);padding:30px 30px 24px;box-shadow:var(--shadow)}
.auth-card h1{font-family:var(--font-serif);font-size:28px;font-weight:600;margin:0 0 8px}
.auth-card .lede{font-size:14.5px;margin-bottom:18px}
.auth-aside{padding-top:18px}
.auth-aside h2{font-family:var(--font-serif);font-size:24px;font-weight:600;margin:0 0 10px}
.auth-aside p{color:var(--ink-mute);font-size:15px}
.auth-aside ul{margin:16px 0 0;padding:0;list-style:none;display:grid;gap:8px}
.auth-aside li{font-size:14px;color:var(--ink-mute);padding-left:18px;position:relative}
.auth-aside li::before{content:"";position:absolute;left:0;top:.62em;width:7px;height:7px;border-radius:50%;background:var(--accent);opacity:.7}
.form{display:grid;gap:14px}
.field{display:grid;gap:6px}
.field label{font-size:13px;color:var(--ink-mute);font-weight:600}
.field input{width:100%;padding:10px 12px;border:1px solid var(--rule);border-radius:8px;background:var(--paper);color:var(--ink);font-size:15px;outline:none}
.field input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 16px;border-radius:8px;border:1px solid transparent;font-size:14.5px;font-weight:600;cursor:pointer;background:var(--ink);color:var(--paper)}
.btn:hover{opacity:.9;text-decoration:none}
.btn[disabled]{opacity:.55;cursor:default}
.btn.ghost{background:transparent;color:var(--ink-soft);border-color:var(--rule)}
.btn.ghost:hover{border-color:var(--ink-faint)}
.btn.primary{background:var(--accent);color:#fff}
html[data-theme=dark] .btn.primary{color:#0b1020}
.btn.small{padding:5px 10px;font-size:12.5px;border-radius:6px}
.auth-foot{font-size:13.5px;color:var(--ink-mute);margin:16px 0 0}
.flash{font-size:13.5px;padding:9px 12px;border-radius:8px;border:1px solid var(--rule);background:var(--tint);margin:0 0 4px;color:var(--ink-soft)}
.flash.error{border-color:#e7b4ae;background:#fdf1ef;color:#8c2f24}
.flash.ok{border-color:#b7dbc9;background:#edf8f2;color:#1c6b48}
html[data-theme=dark] .flash.error{background:#2a1715;border-color:#5a2a24;color:#ffb4a8}
html[data-theme=dark] .flash.ok{background:#12251c;border-color:#24513c;color:#8fe0b8}
.panel{background:var(--panel);border:1px solid var(--rule);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.panel h2{font-family:var(--font-serif);font-size:20px;margin:0 0 12px;font-weight:600}
.panel + .panel{margin-top:18px}
.muted{color:var(--ink-faint);font-size:13px}

/* article */
.article-shell{display:grid;grid-template-columns:minmax(0,760px) 250px;gap:48px;justify-content:center;align-items:start}
.article-top{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:12.5px;color:var(--ink-faint);margin-bottom:14px}
.article-top a{color:var(--ink-mute)}
.article-title{font-family:var(--font-serif);font-size:clamp(28px,3.6vw,40px);line-height:1.2;letter-spacing:-.015em;font-weight:600;margin:0 0 14px}
.article-meta{display:flex;flex-wrap:wrap;gap:14px;font-size:13px;color:var(--ink-faint);padding-bottom:20px;border-bottom:1px solid var(--rule);margin-bottom:30px}
.tag{font-family:var(--font-mono);font-size:11.5px;background:var(--tint);border:1px solid var(--rule);border-radius:999px;padding:2px 8px;color:var(--ink-mute)}
.article-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:46px;padding-top:22px;border-top:1px solid var(--rule)}
.article-nav a{display:block;border:1px solid var(--rule);border-radius:8px;padding:12px 14px;color:var(--ink-soft);font-size:14px}
.article-nav a:hover{border-color:var(--ink-faint);text-decoration:none}
.article-nav .dir{display:block;font-size:11px;color:var(--ink-faint);letter-spacing:.08em;text-transform:uppercase;margin-bottom:4px}
.article-nav .next{text-align:right}
.toc{position:sticky;top:88px;max-height:calc(100vh - 120px);overflow:auto;font-size:13px;border-left:2px solid var(--rule);padding-left:16px}
.toc-title{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-faint);margin:0 0 10px}
.toc ul{list-style:none;margin:0;padding:0}
.toc li{margin:0}
.toc a{display:block;padding:3px 0;color:var(--ink-mute)}
.toc a:hover{color:var(--ink);text-decoration:none}
.toc .lv3 a{padding-left:12px;font-size:12.5px;color:var(--ink-faint)}
.toc .lv4 a{padding-left:24px;font-size:12px;color:var(--ink-faint)}

/* prose */
.prose{font-size:16.5px;line-height:1.78;color:var(--ink-soft);overflow-wrap:anywhere}
.prose h1,.prose h2,.prose h3,.prose h4{font-family:var(--font-serif);color:var(--ink);font-weight:600;line-height:1.3;letter-spacing:-.01em;scroll-margin-top:88px}
.prose h1{font-size:30px;margin:34px 0 14px}
.prose h2{font-size:25px;margin:44px 0 14px;padding-top:20px;border-top:1px solid var(--rule)}
.prose h3{font-size:20px;margin:32px 0 10px}
.prose h4{font-size:17px;margin:26px 0 8px;color:var(--ink-soft)}
.prose p{margin:0 0 16px}
.prose ul,.prose ol{margin:0 0 16px;padding-left:1.35em}
.prose li{margin:4px 0}
.prose li>ul,.prose li>ol{margin:4px 0}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;text-decoration-color:color-mix(in srgb,var(--accent) 35%,transparent)}
.prose strong{color:var(--ink);font-weight:650}
.prose blockquote{margin:20px 0;padding:12px 18px;border-left:3px solid var(--rule);background:var(--tint);color:var(--ink-mute);border-radius:0 8px 8px 0}
.prose blockquote p:last-child{margin:0}
.prose hr{border:none;border-top:1px solid var(--rule);margin:34px 0}
.prose code{font-size:.87em;background:var(--code-bg);border:1px solid var(--rule);border-radius:5px;padding:.1em .35em}
.prose pre{background:var(--code-bg);border:1px solid var(--rule);border-radius:8px;padding:14px 16px;overflow:auto;line-height:1.55;margin:0 0 18px}
.prose pre code{background:none;border:none;padding:0;font-size:13.5px}
.prose table{border-collapse:collapse;width:100%;font-size:14px;margin:0}
.prose th,.prose td{border:1px solid var(--rule);padding:7px 10px;text-align:left;vertical-align:top}
.prose th{background:var(--tint);font-weight:600;color:var(--ink)}
.prose tr:nth-child(even) td{background:color-mix(in srgb,var(--tint) 45%,transparent)}
.table-scroll{overflow-x:auto;margin:0 0 20px;border-radius:8px}
.prose .mermaid{background:var(--panel);border:1px solid var(--rule);border-radius:8px;padding:14px;margin:20px 0;text-align:center;overflow-x:auto}
.prose .mermaid svg{max-width:100%;height:auto}
.anchor-alias{display:block;position:relative;top:-88px;visibility:hidden}
.prose img{border-radius:8px}

/* admin */
.admin-table{width:100%;border-collapse:collapse;font-size:14px}
.admin-table th,.admin-table td{border-bottom:1px solid var(--rule);padding:10px 8px;text-align:left;vertical-align:middle}
.admin-table th{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-faint);font-weight:600}
.admin-table .who strong{display:block;color:var(--ink);font-weight:600}
.admin-table .actions{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.admin-head{display:flex;align-items:end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:18px}

/* footer */
.site-footer{border-top:0;padding:36px 0 24px;margin-top:64px;background:linear-gradient(180deg,var(--paper) 0%,var(--tint) 100%);position:relative}
.site-footer::before{content:"";position:absolute;top:0;left:10%;right:10%;height:1px;background:linear-gradient(90deg,transparent,var(--rule),transparent)}
html[data-theme=dark] .site-footer{background:linear-gradient(180deg,transparent 0%,rgba(124,92,255,.04) 100%)}
html[data-theme=dark] .site-footer::before{background:linear-gradient(90deg,transparent,color-mix(in srgb,var(--accent) 24%,var(--rule)),transparent)}
.site-footer .shell{max-width:var(--shell-width);padding:0 36px}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:64px;margin-bottom:20px;padding:0;justify-content:start;text-align:left}
.footer-col ul{list-style:none;padding:0;margin:0}
.footer-col h3{font-family:var(--font-sans);font-size:var(--fs-xs);line-height:1.35;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);margin:0 0 8px;font-weight:600;padding-left:10px;border-left:2px solid color-mix(in srgb,var(--hue-1) 50%,transparent)}
.footer-col ul li{margin:6px 0}
.footer-col ul a,.footer-col ul .footer-wechat{font-size:var(--fs-sm);color:var(--ink-mute);transition:color .18s var(--easing);background-image:linear-gradient(var(--accent),var(--accent));background-size:0% 1.5px;background-position:0 100%;background-repeat:no-repeat}
.footer-col ul a:hover,.footer-col ul .footer-wechat:hover{color:var(--ink);background-size:100% 1.5px;text-decoration:none}
.footer-wechat{background:transparent;border:0;padding:0;margin:0;font:inherit;font-weight:inherit;letter-spacing:inherit;cursor:pointer;text-align:left;text-decoration:none;color:inherit}
.footer-wechat:hover{color:var(--hue-2)}
.footer-bottom{border-top:1px solid var(--rule);padding-top:16px;display:flex;justify-content:start;align-items:center;gap:16px;font-size:var(--fs-xs);color:var(--ink-faint)}
.footer-bottom .signature{font-family:var(--font-serif);font-style:italic;background:linear-gradient(90deg,var(--ink-mute),var(--ink-faint));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.footer-bottom .signature::before{content:"·";margin-right:16px;-webkit-text-fill-color:var(--rule)}
.wx-modal{position:fixed;inset:0;z-index:9999;display:flex;align-items:center;justify-content:center;pointer-events:none}
.wx-modal[hidden]{display:none!important}
.wx-modal-backdrop{position:absolute;inset:0;background:color-mix(in srgb,var(--ink) 56%,transparent);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);opacity:0;transition:opacity .22s var(--easing);pointer-events:auto}
.wx-modal.is-open .wx-modal-backdrop{opacity:1}
.wx-modal-card{position:relative;width:min(92vw,380px);background:var(--paper);border:1px solid var(--rule);border-radius:var(--radius-lg);padding:36px 36px 32px;text-align:center;box-shadow:0 28px 64px -24px rgba(0,0,0,.4);transform:scale(.96) translateY(8px);opacity:0;transition:transform .24s var(--easing),opacity .24s var(--easing);pointer-events:auto;outline:none}
.wx-modal.is-open .wx-modal-card{transform:scale(1) translateY(0);opacity:1}
.wx-modal-card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--hue-2),var(--hue-1),var(--hue-4));border-radius:var(--radius-lg) var(--radius-lg) 0 0}
.wx-modal-close{position:absolute;top:12px;right:12px;width:28px;height:28px;border:none;background:0 0;font-size:1.4rem;color:var(--ink-faint);line-height:1;cursor:pointer;border-radius:50%;transition:background .18s,color .18s}
.wx-modal-close:hover{background:var(--tint);color:var(--ink)}
.wx-modal-eyebrow{font-family:var(--font-sans);font-size:.72rem;text-transform:uppercase;letter-spacing:.22em;color:var(--ink-faint);margin-bottom:14px}
.wx-modal-id{font-family:var(--font-mono);font-size:1.55rem;font-weight:600;letter-spacing:.02em;color:var(--ink);background:var(--tint);padding:14px 18px;border-radius:10px;border:1px solid var(--rule);margin:0 0 16px;user-select:all}
.wx-modal-hint{font-family:var(--font-serif);font-size:.92rem;color:var(--ink-mute);line-height:1.55;margin-bottom:22px;font-style:italic}
.wx-modal-actions{display:flex;justify-content:center}
.wx-modal-copy{font-family:var(--font-sans);font-size:.9rem;font-weight:600;padding:12px 24px;border-radius:999px;border:none;background:var(--ink);color:var(--paper);cursor:pointer;letter-spacing:.02em;transition:transform .2s,box-shadow .2s,background .2s}
.wx-modal-copy:hover{transform:translateY(-1px);box-shadow:0 10px 24px -8px rgba(0,0,0,.3)}
.wx-modal-copy.is-done{background:var(--hue-2)}

@media (max-width:1080px){
  .article-shell{grid-template-columns:minmax(0,760px)}
  .toc{position:static;border-left:none;border-top:1px solid var(--rule);padding:16px 0 0;max-height:none;order:2}
  .toc ul{columns:2;column-gap:24px}
}
@media (max-width:820px){
  .auth-wrap{grid-template-columns:1fr;gap:28px}
  .auth-aside{padding-top:0}
  .sec-row{grid-template-columns:44px 1fr;gap:10px}
  .sec-meta{grid-column:2;font-size:11.5px}
  .kb-main{padding:28px 0 56px}
  .shell{padding:0 18px}
  .stats{gap:20px}
}
@media (max-width:960px){
  .nav{display:none}
  .menu-toggle{display:grid}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:768px){
  .nav a,.icon-btn,.lang-switch,.drawer nav a,.footer-col ul a,.footer-col ul .footer-wechat{min-height:44px;display:inline-flex;align-items:center}
  .brand{min-height:44px;display:inline-flex;align-items:center}
}
@media (max-width:720px){
  .site-header .shell,.site-footer .shell{padding:0 24px}
  .icon-btn{min-width:44px;min-height:44px}
  .lang-switch{padding:10px 14px}
  .site-footer{padding:36px 0 28px;margin-top:48px}
  .footer-grid{gap:28px}
  .footer-col h3{font-size:.7rem}
  .footer-col ul a{font-size:.92rem}
  .footer-bottom{font-size:.78rem;padding-top:20px;gap:8px;flex-wrap:wrap;justify-content:center;text-align:center}
  .footer-wechat,.footer-col a{padding:4px 0}
}
@media (max-width:480px){
  .brand{font-size:1.15rem}
  .brand .brand-mark{width:24px;height:24px;margin-right:4px}
  .header-tools{gap:0}
  .icon-btn{width:44px;height:44px;min-width:44px;min-height:44px}
  .lang-switch{min-width:44px;min-height:44px;padding:8px 10px;font-size:.72rem;justify-content:center;display:inline-flex;align-items:center}
  .site-header .shell,.site-footer .shell{padding:0 14px}
  .drawer{padding:20px 22px}
  .drawer-head{margin-bottom:16px;padding-bottom:12px}
  .drawer nav a{font-size:1.08rem;padding:12px 4px}
  .search-modal{width:94%}
}
@media (max-width:380px){
  .brand{font-size:1.2rem}
  .header-inner{gap:8px}
  .site-header{padding:0 4px}
  .icon-btn[data-search-open]{display:none}
}
@media (max-width:520px){
  .article-nav{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .footer-bottom{flex-direction:column;gap:12px}
  .prose{font-size:16px}
  .prose pre{font-size:12.5px}
  .toc ul{columns:1}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important;animation:none!important}
}