/* Fieldnotes — design tokens */
:root{
  --bg:#F5F3EE; --surface:#FFFFFF; --surface-2:#EEEBE3; --ink:#15212C; --ink-2:#3A4753; --muted:#66707B;
  --line:#DDD8CC; --line-2:#CFC9BB; --brand:#0E5A61; --brand-2:#0A464C; --on-brand:#FFFFFF;
  --accent:#C77D12; --accent-soft:#F6E8CF; --mm:#0E5A61; --mm-soft:#DCEDEB; --ewm:#9A4A14; --ewm-soft:#F4E2D3;
  --tip:#FBF5E8; --tip-line:#E7C985; --code-bg:#ECEAE3;
  --shadow:0 1px 2px rgba(21,33,44,.05),0 8px 24px -12px rgba(21,33,44,.18);
  --radius:14px; --wrap:1180px;
  --f-display:"Fraunces",Georgia,"Times New Roman",serif;
  --f-sans:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0E1418; --surface:#151D23; --surface-2:#1B252C; --ink:#ECE9E2; --ink-2:#C6CACD; --muted:#8E989F;
  --line:#26323A; --line-2:#33414A; --brand:#5BBFBF; --brand-2:#7ED0D0; --on-brand:#0A1A1C;
  --accent:#E8A33A; --accent-soft:#3A2C14; --mm:#6CC7C3; --mm-soft:#173235; --ewm:#EE9A5E; --ewm-soft:#3A2416;
  --tip:#211D14; --tip-line:#6B5427; --code-bg:#1F2A31; --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px -12px rgba(0,0,0,.6); color-scheme:dark;}}
:root[data-theme="dark"]{
  --bg:#0E1418; --surface:#151D23; --surface-2:#1B252C; --ink:#ECE9E2; --ink-2:#C6CACD; --muted:#8E989F;
  --line:#26323A; --line-2:#33414A; --brand:#5BBFBF; --brand-2:#7ED0D0; --on-brand:#0A1A1C;
  --accent:#E8A33A; --accent-soft:#3A2C14; --mm:#6CC7C3; --mm-soft:#173235; --ewm:#EE9A5E; --ewm-soft:#3A2416;
  --tip:#211D14; --tip-line:#6B5427; --code-bg:#1F2A31; --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px -12px rgba(0,0,0,.6); color-scheme:dark;}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 var(--f-sans);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;display:block}
a{color:inherit}
h1,h2,h3,h4{font-family:var(--f-display);font-weight:500;letter-spacing:-.015em;line-height:1.15;margin:0;font-optical-sizing:auto}
p{margin:0 0 1em}
code,.code{font-family:var(--f-mono);font-size:.86em;background:var(--code-bg);padding:.1em .4em;border-radius:5px}
b,strong{font-weight:600}
::selection{background:var(--accent-soft)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:var(--bg);padding:8px 14px;border-radius:8px;z-index:100}
.skip:focus{left:16px}
.eyebrow{font:600 12px/1.4 var(--f-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);display:flex;align-items:center;gap:10px}
.eyebrow::before{content:"";width:18px;height:2px;background:var(--accent)}
.muted{color:var(--muted)}

/* Header */
.nav{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:saturate(1.4) blur(12px);-webkit-backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.brand-mark{width:34px;height:34px;flex:none}
.brand-text{display:flex;flex-direction:column;line-height:1.05}
.brand-name{font:600 19px/1 var(--f-display);letter-spacing:-.01em}
.brand-sub{font:500 11px/1.3 var(--f-mono);color:var(--muted);letter-spacing:.06em;margin-top:3px}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{text-decoration:none;font-size:15px;color:var(--ink-2);padding:8px 12px;border-radius:8px}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--ink);background:var(--surface-2)}
.icon-btn{appearance:none;border:1px solid var(--line);background:var(--surface);color:var(--ink);width:38px;height:38px;border-radius:10px;display:grid;place-items:center;cursor:pointer}
.icon-btn:hover{border-color:var(--line-2)}
.icon-btn svg{width:18px;height:18px}
.menu-btn{display:none}
.theme-btn .sun{display:none}
:root[data-theme="dark"] .theme-btn .sun{display:block}:root[data-theme="dark"] .theme-btn .moon{display:none}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .theme-btn .sun{display:block}:root:not([data-theme="light"]) .theme-btn .moon{display:none}}
@media (max-width:860px){
  .menu-btn{display:grid}
  .nav-links{position:absolute;top:68px;left:0;right:0;flex-direction:column;align-items:stretch;background:var(--bg);border-bottom:1px solid var(--line);padding:8px 16px 16px;display:none}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px}
  .wrap{padding:0 16px}
}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:10px;font:600 15px/1 var(--f-sans);padding:14px 20px;border-radius:11px;text-decoration:none;border:1px solid transparent;transition:transform .15s ease,background .15s ease}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--brand);color:var(--on-brand)}
.btn-primary:hover{background:var(--brand-2)}
.btn-ghost{border-color:var(--line-2);color:var(--ink);background:var(--surface)}
.btn .arr{font-family:var(--f-mono)}

/* Hero */
.hero{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:64px;align-items:center;padding:56px 0 48px}
.hero h1{font-size:clamp(46px,7vw,84px);font-weight:400;letter-spacing:-.035em;margin:18px 0 10px}
.hero .tagline{font:italic 400 clamp(22px,2.6vw,30px)/1.3 var(--f-display);color:var(--brand);margin:0 0 22px;max-width:30ch}
.hero .intro{font-size:18px;color:var(--ink-2);max-width:56ch}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.portrait-card{background:var(--surface);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);overflow:hidden}
.portrait{position:relative;aspect-ratio:1/1;background:linear-gradient(160deg,var(--mm-soft),var(--surface-2) 60%,var(--accent-soft));display:grid;place-items:center}
.portrait .initials{font:400 80px/1 var(--f-display);color:var(--brand);letter-spacing:-.04em;opacity:.9}
.portrait img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:50% 20%}
.portrait .grid-deco{position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:28px 28px;opacity:.45;mask-image:radial-gradient(circle at 50% 45%,transparent 30%,#000 75%)}
.portrait-meta{padding:16px 20px 18px;display:grid;gap:4px}
.portrait-meta .n{font:500 20px/1.2 var(--f-display)}
.portrait-meta .r{font-size:14px;color:var(--ink-2)}
.portrait-meta .l{font-size:13px;color:var(--muted);display:flex;align-items:center;gap:6px}
.facts{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line)}
.facts div{padding:12px 14px;border-right:1px solid var(--line)}
.facts div:last-child{border-right:0}
.facts b{display:block;font:500 18px/1.1 var(--f-display)}
.facts span{font-size:12px;color:var(--muted)}
@media (max-width:960px){.hero{grid-template-columns:1fr;gap:40px;padding:48px 0 40px}.portrait-card{max-width:340px}}

/* Stats band */
.band{border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:grid;grid-template-columns:repeat(4,1fr)}
.band div{padding:26px 22px;border-right:1px solid var(--line)}
.band div:last-child{border-right:0}
.band b{display:block;font:400 40px/1 var(--f-display);letter-spacing:-.02em}
.band span{font-size:14px;color:var(--muted)}
@media (max-width:700px){.band{grid-template-columns:1fr 1fr}.band div:nth-child(2){border-right:0}.band div:nth-child(-n+2){border-bottom:1px solid var(--line)}.band b{font-size:32px}}

/* Sections */
.section{padding:88px 0 0}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:36px;flex-wrap:wrap}
.section-head h2{font-size:clamp(32px,4.4vw,48px);margin-top:12px;max-width:18ch}
.section-head p{color:var(--ink-2);max-width:46ch;margin:0}
.lead{font-size:19px;color:var(--ink-2);max-width:68ch}

/* Profile */
.profile-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:40px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0 32px}
.chip{font-size:13px;padding:6px 11px;border:1px solid var(--line-2);border-radius:999px;background:var(--surface);color:var(--ink-2)}
.pillars{display:grid;gap:0;border-top:1px solid var(--line)}
.pillar{display:grid;grid-template-columns:44px 1fr;gap:14px;padding:22px 0;border-bottom:1px solid var(--line)}
.pillar .num{font:500 13px/1.8 var(--f-mono);color:var(--accent)}
.pillar h3{font-size:21px;margin-bottom:6px}
.pillar p{margin:0;color:var(--ink-2)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.card + .card{margin-top:16px}
.card h3{font:600 12px/1.4 var(--f-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:16px}
.cert{display:flex;gap:12px;align-items:flex-start;padding:10px 0;border-top:1px solid var(--line)}
.cert:first-of-type{border-top:0;padding-top:0}
.cert svg{flex:none;width:22px;height:22px;color:var(--brand);margin-top:2px}
.cert span{font-size:15px}
.edu{display:grid;gap:12px}
.edu div{display:grid;gap:2px}
.edu b{font-weight:600}
.edu span{font-size:14px;color:var(--muted)}
.inline-list{font-size:15px;color:var(--ink-2);margin:0}
@media (max-width:900px){.profile-grid{grid-template-columns:1fr}}

/* Library */
.lib{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.lib-col{background:var(--surface);border:1px solid var(--line);border-radius:18px;overflow:hidden}
.lib-head{padding:22px 24px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}
.lib-head h3{font-size:24px}
.lib-head .tag{margin-left:0}
.lib-row{display:grid;grid-template-columns:38px 1fr auto;gap:12px;padding:16px 24px;border-bottom:1px solid var(--line);text-decoration:none;align-items:baseline;transition:background .15s}
.lib-row:last-child{border-bottom:0}
.lib-row:hover{background:var(--surface-2)}
.lib-row .i{font:500 13px var(--f-mono);color:var(--muted)}
.lib-row .t{font-weight:600;font-size:16px;display:block}
.lib-row .d{font-size:14px;color:var(--muted);display:block;margin-top:2px}
.lib-row .c{font:500 12px var(--f-mono);color:var(--muted);white-space:nowrap}
@media (max-width:900px){.lib{grid-template-columns:1fr}.lib-row .c{display:none}.lib-row{grid-template-columns:32px 1fr;padding:14px 18px}.lib-head{padding:18px}}

.tag{white-space:nowrap;display:inline-flex;align-items:center;gap:6px;font:600 11px/1 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;padding:6px 9px;border-radius:6px}
.tag.mm{background:var(--mm-soft);color:var(--mm)}
.tag.ewm{background:var(--ewm-soft);color:var(--ewm)}
.tag.ref{background:var(--accent-soft);color:var(--accent)}

/* Notes grid */
.notes{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.note-card{display:flex;flex-direction:column;gap:12px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;text-decoration:none;transition:transform .15s,border-color .15s,box-shadow .15s}
.note-card:hover{transform:translateY(-2px);border-color:var(--line-2);box-shadow:var(--shadow)}
.note-card .tag{align-self:flex-start}
.note-card h3{font-size:22px}
.note-card p{color:var(--ink-2);font-size:15px;margin:0;flex:1}
.note-card .meta{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--muted)}
@media (max-width:960px){.notes{grid-template-columns:1fr 1fr}}
@media (max-width:640px){.notes{grid-template-columns:1fr}}

/* Reference teaser */
.ref-teaser{display:grid;grid-template-columns:1.1fr 1fr;gap:32px;align-items:center;background:var(--ink);color:var(--bg);border-radius:22px;padding:44px;position:relative;overflow:hidden}
.ref-teaser h2{font-size:clamp(28px,3.6vw,40px);margin:10px 0 12px}
.ref-teaser p{color:color-mix(in srgb,var(--bg) 75%,transparent)}
.ref-teaser .eyebrow{color:color-mix(in srgb,var(--bg) 65%,transparent)}
.ref-teaser .btn-primary{background:var(--accent);color:#1b1206}
.code-stack{display:flex;flex-wrap:wrap;gap:8px}
.code-stack span{font:500 13px var(--f-mono);border:1px solid color-mix(in srgb,var(--bg) 25%,transparent);border-radius:8px;padding:8px 10px;color:var(--bg)}
@media (max-width:860px){.ref-teaser{grid-template-columns:1fr;padding:30px 22px}}

/* Contact */
.contact{margin:88px 0 0;padding:56px;border-radius:22px;background:var(--surface);border:1px solid var(--line);display:grid;grid-template-columns:1.2fr 1fr;gap:32px;align-items:center}
.contact h2{font-size:clamp(32px,4.6vw,52px);margin-top:12px}
.contact-links{display:grid;gap:12px}
.contact-link{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px 20px;border:1px solid var(--line);border-radius:12px;text-decoration:none;background:var(--bg);transition:border-color .15s}
.contact-link:hover{border-color:var(--brand)}
.contact-link small{display:block;color:var(--muted);font-size:13px}
.contact-link b{font-weight:600;word-break:break-all}
@media (max-width:860px){.contact{grid-template-columns:1fr;padding:30px 22px}}

/* Footer */
.footer{margin-top:96px;border-top:1px solid var(--line);padding:36px 0 44px;font-size:14px;color:var(--muted)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:32px}
.footer a{color:var(--ink-2)}
.footer .fl{display:flex;flex-wrap:wrap;gap:6px 18px;justify-content:flex-end}
.footer .disc{font-size:12.5px;margin-top:10px;max-width:70ch}
@media (max-width:760px){.footer-grid{grid-template-columns:1fr}.footer .fl{justify-content:flex-start}}

/* Page header (guides, notes) */
.crumbs{font-size:14px;color:var(--muted);padding-top:32px;display:flex;flex-wrap:wrap;gap:8px}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--ink)}
.page-head{padding:22px 0 36px;border-bottom:1px solid var(--line);margin-bottom:44px}
.page-head .row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.page-head h1{font-size:clamp(36px,5.4vw,60px);font-weight:400;letter-spacing:-.03em;margin:18px 0 14px;max-width:22ch}
.page-head .lede{font-size:19px;color:var(--ink-2);max-width:62ch;margin:0}
.scope{margin-top:24px;display:flex;gap:12px;padding:14px 18px;border-left:3px solid var(--accent);background:var(--surface);border-radius:0 10px 10px 0;font-size:15px;color:var(--ink-2);max-width:780px}
.scope b{font:600 11px/1.9 var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--accent);flex:none}

.doc{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:56px;align-items:start}
.toc{position:sticky;top:92px;font-size:14px}
.toc h4{font:600 11px/1.4 var(--f-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
.toc ol{list-style:none;margin:0;padding:0;border-left:1px solid var(--line)}
.toc a{display:block;padding:6px 0 6px 14px;margin-left:-1px;border-left:2px solid transparent;color:var(--ink-2);text-decoration:none;line-height:1.4}
.toc a:hover{color:var(--ink)}
.toc a.active{border-left-color:var(--accent);color:var(--ink);font-weight:500}
.toc .side-note{margin-top:22px;padding-top:18px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}
@media (max-width:980px){.doc{grid-template-columns:1fr;gap:0}.toc{position:static;order:-1;margin-bottom:32px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px}.toc .side-note{display:none}}

.topic{padding:0 0 40px;margin-bottom:40px;border-bottom:1px solid var(--line)}
.topic-head{display:flex;gap:16px;align-items:baseline;margin-bottom:14px}
.topic-head .n{font:500 14px var(--f-mono);color:var(--accent);flex:none;min-width:26px}
.topic h2{font-size:clamp(25px,2.8vw,32px)}
.topic .body{padding-left:42px}
.topic .body > p{font-size:17px;color:var(--ink-2)}
.points{margin:0 0 18px;padding:0;list-style:none;display:grid;gap:8px}
.points li{position:relative;padding-left:22px;color:var(--ink-2)}
.points li::before{content:"";position:absolute;left:2px;top:.68em;width:8px;height:8px;border:2px solid var(--brand);border-radius:2px}
.kv{display:grid;grid-template-columns:120px 1fr;gap:10px 16px;padding:16px 18px;background:var(--surface);border:1px solid var(--line);border-radius:12px;margin-top:16px;font-size:14px}
.kv dt{font:600 11px/2 var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.kv dd{margin:0}
.tcodes{display:flex;flex-wrap:wrap;gap:6px}
.tcodes code{background:var(--code-bg);border:1px solid var(--line);font-size:12.5px;padding:3px 8px}
.cfg{font-family:var(--f-mono);font-size:12.5px;color:var(--ink-2);line-height:1.6}
.tip{margin-top:14px;padding:14px 18px;background:var(--tip);border:1px solid var(--tip-line);border-radius:12px;font-size:15px;display:flex;gap:12px}
.tip svg{flex:none;width:20px;height:20px;color:var(--accent);margin-top:2px}
.tip b{font-weight:600}
@media (max-width:640px){.topic .body{padding-left:0}.kv{grid-template-columns:1fr;gap:4px}.kv dd{margin-bottom:8px}}

.practice{background:var(--ink);color:var(--bg);border-radius:18px;padding:32px;margin:8px 0 32px}
.practice .eyebrow{color:color-mix(in srgb,var(--bg) 65%,transparent)}
.practice h2{font-size:28px;margin:12px 0 10px}
.practice p{color:color-mix(in srgb,var(--bg) 80%,transparent);margin:0;font-size:17px}
.qa h2{font-size:28px;margin:8px 0 16px}
.qa details{border:1px solid var(--line);background:var(--surface);border-radius:12px;margin-bottom:10px}
.qa summary{cursor:pointer;padding:16px 18px;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:16px}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"+";font:400 22px/1 var(--f-mono);color:var(--muted)}
.qa details[open] summary::after{content:"–"}
.qa details p{padding:0 18px 16px;margin:0;color:var(--ink-2)}
.links-box{margin-top:28px;padding:20px 22px;border:1px dashed var(--line-2);border-radius:12px;font-size:15px}
.links-box h4{font:600 11px/1.4 var(--f-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.links-box a{color:var(--brand);display:block;padding:3px 0}
.pager{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:48px}
.pager a{display:block;padding:20px 22px;border:1px solid var(--line);border-radius:14px;text-decoration:none;background:var(--surface)}
.pager a:hover{border-color:var(--brand)}
.pager small{display:block;font:500 12px var(--f-mono);color:var(--muted);letter-spacing:.06em;text-transform:uppercase;margin-bottom:6px}
.pager b{font:500 19px/1.3 var(--f-display)}
.pager .next{text-align:right}
@media (max-width:640px){.pager{grid-template-columns:1fr}.pager .next{text-align:left}}

/* Article */
.article{max-width:720px}
.article h2{font-size:28px;margin:40px 0 14px}
.article p,.article li{font-size:18px;color:var(--ink-2)}
.article ol,.article ul{padding-left:22px}
.article li{margin-bottom:8px}

/* Library page */
.toolbar{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-bottom:28px}
.search{flex:1;min-width:240px;position:relative}
.search input{width:100%;font:16px var(--f-sans);padding:14px 16px 14px 44px;border:1px solid var(--line-2);border-radius:12px;background:var(--surface);color:var(--ink)}
.search input:focus{outline:2px solid var(--brand);outline-offset:0;border-color:transparent}
.search svg{position:absolute;left:15px;top:50%;transform:translateY(-50%);width:18px;height:18px;color:var(--muted)}
.filters{display:flex;gap:6px}
.filters button{font:600 13px var(--f-sans);padding:10px 14px;border:1px solid var(--line-2);border-radius:10px;background:var(--surface);color:var(--ink-2);cursor:pointer}
.filters button[aria-pressed="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.guide-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.guide-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:24px;display:flex;flex-direction:column;gap:10px}
.guide-card h3{font-size:23px}
.guide-card h3 a{text-decoration:none}
.guide-card h3 a:hover{color:var(--brand)}
.guide-card > p{color:var(--ink-2);font-size:15px;margin:0}
.guide-card ul{list-style:none;margin:6px 0 0;padding:0;border-top:1px solid var(--line)}
.guide-card li a{display:block;padding:8px 0;border-bottom:1px solid var(--line);font-size:14px;text-decoration:none;color:var(--ink-2)}
.guide-card li a:hover{color:var(--brand)}
.guide-card li.hit a{color:var(--ink);font-weight:600}
.guide-card .top{display:flex;justify-content:space-between;align-items:center}
.guide-card .count{font:500 12px var(--f-mono);color:var(--muted)}
.empty{display:none;padding:40px;text-align:center;border:1px dashed var(--line-2);border-radius:14px;color:var(--muted)}
@media (max-width:860px){.guide-grid{grid-template-columns:1fr}}

/* Reference */
.ref-nav{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:36px}
.ref-nav a{font-size:14px;padding:8px 14px;border:1px solid var(--line-2);border-radius:999px;text-decoration:none;background:var(--surface)}
.ref-section{margin-bottom:56px}
.ref-section > h2{font-size:34px;margin-bottom:8px}
.ref-groups{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:20px}
.ref-groups.three{grid-template-columns:repeat(3,1fr)}
.ref-card{background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.ref-card h3{font:600 12px/1.4 var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);padding:14px 18px;border-bottom:1px solid var(--line);background:var(--surface-2)}
table{border-collapse:collapse;width:100%;font-size:14px}
td{padding:9px 18px;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child td{border-bottom:0}
td:first-child{font-family:var(--f-mono);font-size:13px;white-space:nowrap;color:var(--brand);width:1%}
@media (max-width:900px){.ref-groups,.ref-groups.three{grid-template-columns:1fr}td:first-child{white-space:normal}}

.notfound{text-align:center;padding:120px 0 40px}
.notfound h1{font-size:clamp(60px,10vw,120px);font-weight:300}

@media print{.nav,.toc,.footer,.pager,.cta-row,.theme-btn{display:none!important}body{background:#fff;color:#000}.doc{display:block}.qa details{border:0}.practice{background:#f3f3f3;color:#000}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}