/* OrionFlow — research / article styles (shares the landing design system) */
:root{
  --paper:#FFFFFF; --surface:#FFFFFF; --nav-bg:rgba(255,255,255,.82);
  --ink:#161324; --slate:#6B6880;
  --accent:#5D4BD6; --accent-2:#8B79F2; --accent-deep:#4C3CC2;
  --accent-soft:#EFEBFB; --tint:#FAF9FE; --line:#ECEAF7; --line-strong:#DCD8EF;
  --display:"Archivo",system-ui,sans-serif;
  --body:"IBM Plex Sans",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
}
[data-theme="dark"]{
  --paper:#0E0B18; --surface:#181426; --nav-bg:rgba(14,11,24,.8);
  --ink:#ECEAF6; --slate:#9A93B4;
  --accent:#8B79F2; --accent-2:#A593F7; --accent-deep:#6E5BE6;
  --accent-soft:#221C3A; --tint:#141021; --line:#2A2442; --line-strong:#3A335A;
}
*{box-sizing:border-box;}
html{background:var(--paper);scroll-behavior:smooth;}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);
  font-size:18px;line-height:1.72;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;}
a{color:inherit;text-decoration:none;}
.rwrap{max-width:720px;margin:0 auto;padding:0 28px;}
.mono{font-family:var(--mono);}

/* header */
.rhead{position:sticky;top:0;z-index:40;background:var(--nav-bg);
  backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid var(--line);}
.rhead__in{max-width:980px;margin:0 auto;padding:0 28px;height:62px;display:flex;
  align-items:center;justify-content:space-between;}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--display);font-weight:700;font-size:18px;color:var(--ink);}
.brand .wm{background:linear-gradient(96deg,#5D4BD6,#8B79F2);-webkit-background-clip:text;background-clip:text;color:transparent;}
.rhead__r{display:flex;align-items:center;gap:18px;}
.rhead__r a{font-size:14.5px;color:var(--slate);font-weight:500;}
.rhead__r a:hover{color:var(--ink);}
.theme-btn{width:34px;height:34px;border:1px solid var(--line-strong);border-radius:8px;background:transparent;
  display:inline-flex;align-items:center;justify-content:center;cursor:pointer;color:var(--ink);
  transition:border-color .15s ease,background .15s ease;}
.theme-btn:hover{border-color:var(--ink);background:var(--accent-soft);}
.theme-btn svg{width:16px;height:16px;}
.theme-btn .moon{display:none;}
[data-theme="dark"] .theme-btn .sun{display:none;}
[data-theme="dark"] .theme-btn .moon{display:inline;}

/* article head */
.art{padding:60px 0 20px;}
.eyebrow{font-family:var(--mono);font-size:12px;font-weight:600;letter-spacing:.14em;
  text-transform:uppercase;color:var(--accent);}
.art h1{font-family:var(--display);font-weight:700;font-size:clamp(30px,4.6vw,46px);
  line-height:1.07;letter-spacing:-.025em;margin:16px 0 0;}
.art__lead{font-size:20px;color:var(--slate);margin:20px 0 0;line-height:1.6;}
.art__meta{display:flex;gap:14px;align-items:center;margin:26px 0 0;padding-bottom:30px;
  border-bottom:1px solid var(--line);font-family:var(--mono);font-size:12.5px;color:var(--slate);}
.art__meta .sep{width:4px;height:4px;border-radius:50%;background:var(--line-strong);}

/* prose */
.prose{padding:14px 0 0;}
.prose>*+*{margin-top:22px;}
.prose h2{font-family:var(--display);font-weight:700;font-size:25px;letter-spacing:-.015em;
  margin-top:46px;line-height:1.2;}
.prose h3{font-family:var(--display);font-weight:600;font-size:19px;margin-top:34px;}
.prose p{margin:0;}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:2px;text-decoration-thickness:1px;}
.prose ul,.prose ol{margin:0;padding-left:22px;}
.prose li{margin:8px 0;}
.prose strong{font-weight:600;color:var(--ink);}
.prose code{font-family:var(--mono);font-size:.86em;background:var(--accent-soft);color:var(--ink);
  padding:2px 6px;border-radius:5px;}
.prose pre{font-family:var(--mono);font-size:13.5px;line-height:1.65;background:var(--surface);
  border:1px solid var(--line);border-radius:12px;padding:18px 20px;overflow:auto;}
.prose pre code{background:none;padding:0;color:var(--ink);font-size:13.5px;}
.prose blockquote{margin:0;padding:6px 0 6px 20px;border-left:3px solid var(--accent);
  color:var(--slate);font-size:19px;}
.callout{border:1px solid var(--line);background:var(--tint);border-radius:12px;padding:18px 20px;}
.callout .k{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);}
.callout p{margin:8px 0 0;font-size:16px;color:var(--ink);}
.prose hr{border:0;border-top:1px solid var(--line);margin:42px 0;}
.figure{margin:30px 0;text-align:center;}
.figure figcaption{font-family:var(--mono);font-size:12px;color:var(--slate);margin-top:10px;}

/* post list (index) */
.posts{list-style:none;margin:36px 0 0;padding:0;border-top:1px solid var(--line);}
.post{display:grid;grid-template-columns:158px 1fr 28px;gap:26px;align-items:baseline;
  padding:26px 10px;border-bottom:1px solid var(--line);transition:background .18s ease;}
.post:hover{background:var(--tint);}
.post__meta{font-family:var(--mono);font-size:11.5px;letter-spacing:.05em;color:var(--slate);
  text-transform:uppercase;white-space:nowrap;}
.post__title{font-family:var(--display);font-weight:600;font-size:21px;letter-spacing:-.015em;line-height:1.2;}
.post:hover .post__title{text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;}
.post__desc{margin:8px 0 0;color:var(--slate);font-size:15px;}
.post__arrow{font-family:var(--mono);color:var(--slate);justify-self:end;align-self:center;
  transition:transform .18s ease,color .18s ease;}
.post:hover .post__arrow{transform:translateX(4px);color:var(--ink);}

/* footer / nav between posts */
.backlink{display:inline-flex;align-items:center;gap:8px;margin:50px 0 0;font-weight:500;color:var(--accent);}
.backlink:hover{text-decoration:underline;text-underline-offset:3px;}
.rfoot{margin-top:72px;background:radial-gradient(900px 320px at 50% -40%,#2A2147,transparent 70%),
  linear-gradient(180deg,#181327,#100C1D);color:#CFC9E6;position:relative;}
.rfoot::before{content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(139,121,242,.55),transparent);}
.rfoot__in{max-width:980px;margin:0 auto;padding:34px 28px;display:flex;justify-content:space-between;
  align-items:center;gap:18px;flex-wrap:wrap;font-size:13.5px;color:#8E86AC;}
.rfoot .brand .wm{background:linear-gradient(96deg,#9C8BF5,#C9D6FB);-webkit-background-clip:text;background-clip:text;color:transparent;}

a:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px;}

@media (max-width:880px){
  .post{grid-template-columns:1fr;gap:7px;}.post__arrow{display:none;}
  .rhead__r a.hidesm{display:none;}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;}}