:root{--paper:#F4F5F2;--card:#FDFDFB;--ink:#191B1D;--muted:#666C72;--copper:#A83C34;
--copper-deep:#7D2B26;--olive:#4E5A66;--hair:#E2E3DE}
*{margin:0;padding:0;box-sizing:border-box}
body{background:var(--paper);color:var(--ink);font:17px/1.7 "Inter",system-ui,sans-serif}
a{color:var(--copper-deep)}
.wrap{max-width:1040px;margin:0 auto;padding:0 22px}
header.top{background:var(--ink);position:sticky;top:0;z-index:200}
#read-progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--copper);z-index:300}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:18px 0;gap:16px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:#F4F5F2}
.brand svg{flex:0 0 auto}
.brand .n{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:21px;line-height:1.1}
.brand .t{display:block;font-family:'IBM Plex Mono',monospace;font-weight:600;font-size:10px;
letter-spacing:.34em;text-transform:uppercase;color:var(--copper)}
nav.main{display:flex;gap:22px;flex-wrap:wrap}
nav.main a{font-family:'IBM Plex Mono',monospace;text-decoration:none;color:#9AA1A6;font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;padding-bottom:3px}
nav.main a:hover,nav.main a.on{color:#F4F5F2;border-bottom:2px solid var(--copper)}
.hero{padding:72px 0 64px;text-align:left;background:var(--ink);border-bottom:4px solid var(--copper)}
.kicker{font-family:'IBM Plex Mono',monospace;letter-spacing:.18em;text-transform:uppercase;font-size:12px;color:#C4645C;font-weight:600}
.hero h1{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:clamp(32px,5vw,50px);line-height:1.12;max-width:840px;margin:14px 0 16px;color:#F4F5F2}
.hero h1 span{display:block}
h1,h2,h3,h4{text-wrap:balance}
.hero p{color:#9AA1A6;max-width:520px;margin:0 0 26px;font-size:17px;line-height:1.55}
.btn{display:inline-block;background:var(--copper);color:#fff;border-radius:8px;padding:12px 26px;font-weight:600;font-size:15px;text-decoration:none;border:0;cursor:pointer}
padding:12px 28px;font-weight:600;font-size:15px;text-decoration:none;border:0;cursor:pointer}
.btn:hover{background:var(--copper-deep)}
.grid{display:block;padding:30px 0 10px;border-top:2px solid var(--ink)}
@media(max-width:820px){.card{grid-template-columns:1fr}.card .num{display:none}.card .thumb{order:-1}}
.card{background:transparent;border:0;border-bottom:1px solid var(--hair);border-radius:0;
display:grid;grid-template-columns:64px 1fr 250px;gap:26px;align-items:center;text-decoration:none;color:var(--ink);padding:26px 0}
.card:hover .num{color:var(--copper)}
.card .num{font-family:'IBM Plex Mono',monospace;font-size:26px;color:#C6C9C4;font-weight:600;transition:color .15s}
.card img,.card svg{width:100%;height:auto;display:block}
.card .thumb{border:1px solid var(--hair);border-radius:10px;overflow:hidden}
.card .pad{padding:0}
.card .cat{font-family:'IBM Plex Mono',monospace;color:var(--copper);letter-spacing:.14em;text-transform:uppercase;font-size:11px;font-weight:600}
.card h3{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:22px;line-height:1.25;margin:8px 0 8px}
.card p{color:var(--muted);font-size:15px}
.sectionhead{font-family:'Space Grotesk',sans-serif;font-size:26px;margin:36px 0 4px}
article.post{max-width:680px;margin:0 auto;padding:46px 0 30px}
article.post .cat{font-family:'IBM Plex Mono',monospace;color:var(--copper);letter-spacing:.16em;text-transform:uppercase;font-size:12px;font-weight:600}
article.post h1{font-family:'Space Grotesk',sans-serif;font-size:clamp(28px,4.6vw,40px);line-height:1.2;margin:10px 0 12px}
article.post .meta{font-family:'IBM Plex Mono',monospace;color:var(--muted);font-size:12px;margin-bottom:26px;text-transform:uppercase;letter-spacing:.04em}
article.post .heroimg{border-radius:14px;border:1px solid var(--hair);margin-bottom:30px;width:100%;height:auto;display:block}
article.post h2{font-family:'Space Grotesk',sans-serif;font-size:26px;margin:38px 0 12px;line-height:1.25}
article.post h3{font-family:'Space Grotesk',sans-serif;font-size:20px;margin:28px 0 10px}
article.post p{margin-bottom:16px}
article.post ul,article.post ol{margin:0 0 16px 22px}
article.post li{margin-bottom:8px}
article.post blockquote{border-left:3px solid var(--copper);padding:4px 0 4px 18px;color:var(--olive);
font-family:'Space Grotesk',sans-serif;font-size:19px;margin:22px 0}
.newsletter{background:var(--card);color:var(--ink);border:1px solid var(--hair);border-top:5px solid var(--copper);border-radius:12px;padding:38px 30px;text-align:left;margin:40px 0}
.newsletter h2{font-family:'Space Grotesk',sans-serif;font-size:26px;margin-bottom:8px}
.newsletter p{color:var(--muted);max-width:460px;margin:0 0 18px;font-size:15px}
.newsletter form{display:flex;gap:10px;justify-content:flex-start;flex-wrap:wrap}
.newsletter input{border-radius:8px;border:1.5px solid var(--hair);background:var(--paper);color:var(--ink);
padding:12px 18px;font-size:15px;min-width:250px}
.newsletter .ok{color:var(--copper);font-weight:600;display:none}
footer{margin-top:30px;background:var(--ink)}
.foot{display:flex;justify-content:space-between;gap:20px;padding:30px 0;flex-wrap:wrap;
color:#9AA1A6;font-size:12.5px;font-family:'IBM Plex Mono',monospace}
.foot a{color:#9AA1A6;text-decoration:none;margin-right:14px}
.foot a:hover{color:#F4F5F2}
.pagehead{padding:46px 0 8px}
.pagehead h1{font-family:'Space Grotesk',sans-serif;font-size:34px}
.prose{max-width:680px;padding:18px 0 50px;color:var(--ink)}
.prose p{margin-bottom:14px;color:var(--muted)}
.prose h2{font-family:'Space Grotesk',sans-serif;font-size:23px;margin:28px 0 10px;color:var(--ink)}
.prose ul{margin:0 0 14px 22px;color:var(--muted)}
.faq{border-top:1px solid var(--hair);margin-top:34px;padding-top:8px}
.faq h2{font-family:'Space Grotesk',sans-serif;font-size:26px;margin:20px 0 6px}
.faq h3{font-family:'Space Grotesk',sans-serif;font-size:19px;margin:20px 0 6px}
.faq p{color:var(--muted)}
.srcs{border-top:1px solid var(--hair);margin-top:34px;padding-top:16px;font-size:14px;color:var(--muted)}
.srcs h2{font-family:'Space Grotesk',sans-serif;font-size:20px;margin-bottom:10px;color:var(--ink)}
.srcs ol{margin-left:20px}
.srcs a{word-break:break-all}

/* article layout with TOC sidebar */
.article-layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:44px;max-width:1000px;margin:0 auto;padding:46px 0 30px}
.article-sidebar{min-width:0}
.toc{position:sticky;top:86px;background:var(--card);border:1px solid var(--hair);border-radius:12px;padding:18px 18px 14px}
.toc-title{font-size:11px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--copper);margin-bottom:10px}
.toc ul{list-style:none;margin:0}
.toc li{margin:0 0 8px}
.toc a{color:var(--muted);text-decoration:none;font-size:13.5px;line-height:1.4;display:block}
.toc a:hover{color:var(--copper-deep)}
@media(max-width:900px){.article-layout{grid-template-columns:1fr;gap:0;padding:34px 0 20px}
.toc{position:static;margin-bottom:26px}}

/* in-article figures, tables, stats */
article.post table{width:100%;border-collapse:collapse;margin:22px 0;font-size:15px;background:var(--card);border:1px solid var(--hair);border-radius:12px;overflow:hidden}
article.post th{background:var(--ink);color:#EDEFEA;text-align:left;padding:11px 14px;font-weight:600;font-size:13.5px;letter-spacing:.03em}
article.post td{padding:11px 14px;border-top:1px solid var(--hair);color:var(--muted);vertical-align:top}
article.post td:first-child{color:var(--ink);font-weight:600}
article.post tr:nth-child(even) td{background:#F8F9F6}
.tablewrap{overflow-x:auto;margin:22px 0}
.tablewrap table{margin:0}
figure.fig{margin:28px 0;background:var(--card);border:1px solid var(--hair);border-radius:14px;overflow:hidden}
figure.fig svg,figure.fig img{width:100%;height:auto;display:block}
figure.fig figcaption{padding:12px 18px;font-size:13.5px;color:var(--muted);border-top:1px solid var(--hair)}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:26px 0}
@media(max-width:640px){.stats{grid-template-columns:1fr}}
.stat{background:var(--card);border:1px solid var(--hair);border-radius:12px;padding:18px 16px 14px;text-align:center}
.stat b{display:block;font-family:'Space Grotesk',sans-serif;font-size:30px;color:var(--copper-deep);line-height:1.1;margin-bottom:6px}
.stat span{font-size:13px;color:var(--muted);line-height:1.4;display:block}