/* Zeno blog + guidelines — 2026-09-23.
   Same design system as the logged-out landing (landing.block.html): white and
   calm by default, Outfit everywhere, purple as the only brand colour, pastel
   cards. Dark only when the visitor picked it — the key is shared with the
   landing (localStorage zeno_landing_theme), so the two never disagree. */
:root{
  --bg:#ffffff; --bg-soft:#F6F7FC; --surface:#ffffff;
  --ink:#0E1020; --ink-2:#5A6079; --line:#E7E9F4; --line-2:#D3D7E8;
  --brand:#6C4DFF; --brand-2:#5738E8; --brand-soft:#F0ECFF;
  --red:#D4412F; --red-soft:#FFEEEA; --ok:#0B8A62; --ok-soft:#E3F8EF; --hl:#FFE36E;
  --p-yellow:#FFF3C9; --p-mint:#D8F5EA; --p-lilac:#EDE7FF; --p-sky:#E0ECFF; --p-peach:#FFE9DE;
  --sh-1:0 1px 2px rgba(14,16,32,.04),0 8px 24px rgba(14,16,32,.06);
  --sh-2:0 2px 6px rgba(14,16,32,.06),0 18px 44px rgba(14,16,32,.10);
}
html.zl-dark{
  --bg:#0B0D18; --bg-soft:#11142A; --surface:#141827;
  --ink:#ECEEF8; --ink-2:#A2A8C2; --line:#242940; --line-2:#333A57;
  --brand-soft:#1D1B36; --red:#FF8A6B; --red-soft:#2A1A17; --ok:#4BE3B0; --ok-soft:#132A24;
  --hl:rgba(139,111,255,.42);
  --p-yellow:#2A2617; --p-mint:#132A24; --p-lilac:#1E1A33; --p-sky:#141F33; --p-peach:#2A1C17;
  --sh-1:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.35);
  --sh-2:0 2px 6px rgba(0,0,0,.35),0 18px 44px rgba(0,0,0,.45);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:'Outfit',system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  font-size:17.5px;line-height:1.72;-webkit-font-smoothing:antialiased}
a{color:var(--brand)}
a:hover{color:var(--brand-2)}
img,svg{max-width:100%}
:focus-visible{outline:3px solid var(--brand);outline-offset:3px;border-radius:8px}
h1,h2,h3{font-family:inherit;letter-spacing:-.02em;color:var(--ink)}
.zb-wrap{max-width:1200px;margin:0 auto;padding:0 20px}
@media(min-width:1000px){.zb-wrap{padding:0 40px}}

/* ── Header (same as the landing) ────────────────────────────────────────── */
.zb-head{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:saturate(1.6) blur(12px);-webkit-backdrop-filter:saturate(1.6) blur(12px);border-bottom:1px solid var(--line)}
.zb-head .in{max-width:1200px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:16px}
@media(min-width:1000px){.zb-head .in{padding:14px 40px}}
.zb-brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:21px;letter-spacing:-.02em;color:var(--ink);text-decoration:none}
.zb-brand:hover{color:var(--ink)}
.zb-brand img{width:34px;height:34px;border-radius:10px;box-shadow:0 4px 12px rgba(139,111,255,.30)}
.zb-nav{display:none}
.zb-act{margin-left:auto;display:flex;align-items:center;gap:8px}
.zb-icon{width:44px;height:44px;border-radius:11px;border:1.5px solid var(--line-2);background:none;color:var(--ink);
  display:grid;place-items:center;cursor:pointer;flex:none}
.zb-icon svg{width:20px;height:20px}
.zb-icon:hover{background:var(--bg-soft)}
.zb-btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:44px;padding:10px 20px;border-radius:11px;
  font-size:15.5px;font-weight:600;text-decoration:none;transition:transform .16s,background-color .16s,box-shadow .16s}
.zb-btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(108,77,255,.32)}
.zb-btn-primary:hover{background:var(--brand-2);color:#fff;transform:translateY(-2px)}
.zb-drawer{display:none;border-top:1px solid var(--line);background:var(--bg);padding:8px 20px 22px}
.zb-drawer[data-open="1"]{display:block}
.zb-drawer a{display:block;padding:14px 4px;font-size:17px;font-weight:500;border-bottom:1px solid var(--line);color:var(--ink);text-decoration:none}
@media(min-width:1000px){
  .zb-burger,.zb-drawer{display:none !important}
  .zb-nav{display:flex;align-items:center;gap:28px;margin-left:48px;font-size:16px;font-weight:500}
  .zb-nav a{color:var(--ink-2);text-decoration:none}
  .zb-nav a:hover,.zb-nav a[aria-current]{color:var(--ink)}
}
@media(max-width:380px){.zb-act .zb-btn{padding:10px 14px}}

/* ── Blog index ──────────────────────────────────────────────────────────── */
.zb-hero{position:relative;overflow:hidden;padding:48px 0 30px}
.zb-hero::before{content:'';position:absolute;z-index:-1;right:-14%;top:-40%;width:min(820px,90vw);height:min(820px,90vw);border-radius:50%;
  background:radial-gradient(circle,rgba(108,77,255,.13) 0%,rgba(108,77,255,.05) 42%,transparent 68%)}
.zb-crumb{font-size:14px;color:var(--ink-2);margin:0 0 16px}
.zb-crumb a{color:var(--ink-2);text-decoration:none}
.zb-crumb a:hover{color:var(--ink)}
.zb-hero h1{font-size:clamp(38px,5.4vw,60px);font-weight:700;line-height:1.05;letter-spacing:-.03em;margin:0 0 16px}
.zb-hero h1 span{position:relative;z-index:0;white-space:nowrap}
.zb-hero h1 span::after{content:'';position:absolute;left:-1.5%;right:-1.5%;bottom:.06em;height:.32em;z-index:-1;background:var(--hl);border-radius:3px;transform:rotate(-.7deg)}
.zb-lead{font-size:clamp(17px,1.5vw,19.5px);line-height:1.62;color:var(--ink-2);max-width:40em;margin:0}
.zb-filter{display:flex;gap:8px;overflow-x:auto;padding:26px 0 6px;scrollbar-width:none}
.zb-filter::-webkit-scrollbar{display:none}
.zb-filter button{flex:none;font:inherit;font-size:15px;font-weight:600;padding:9px 16px;border-radius:999px;cursor:pointer;
  border:1.5px solid var(--line-2);background:var(--surface);color:var(--ink-2);transition:all .15s}
.zb-filter button:hover{color:var(--ink);border-color:var(--ink-2)}
.zb-filter button[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:var(--bg)}
.zb-grid{display:grid;grid-template-columns:1fr;gap:16px;margin:18px 0 10px}
@media(min-width:680px){.zb-grid{grid-template-columns:1fr 1fr}}
@media(min-width:1000px){.zb-grid{grid-template-columns:repeat(3,1fr);gap:20px}}
.zb-card{position:relative;display:flex;flex-direction:column;gap:10px;min-height:236px;padding:24px 24px 20px;border-radius:24px;
  text-decoration:none;color:var(--ink);border:1px solid transparent;transition:transform .2s,box-shadow .2s}
.zb-card:hover{color:var(--ink);transform:translateY(-4px);box-shadow:var(--sh-2)}
html.zl-dark .zb-card{border-color:var(--line)}
.zb-card h2{font-size:20px;font-weight:700;line-height:1.25;margin:0}
.zb-card p{margin:0;font-size:15px;line-height:1.55;color:var(--ink-2)}
.zb-card .zb-more{margin-top:auto;padding-top:8px;display:flex;align-items:center;justify-content:space-between;font-size:14px;font-weight:600;color:var(--ink-2)}
.zb-card .zb-more b{width:34px;height:34px;border-radius:50%;background:rgba(255,255,255,.75);display:grid;place-items:center;color:var(--ink);transition:transform .2s}
html.zl-dark .zb-card .zb-more b{background:rgba(255,255,255,.08)}
.zb-card:hover .zb-more b{transform:translateX(3px)}
.zb-card .zb-more svg{width:16px;height:16px}
.zb-card[hidden]{display:none}
.zb-tag{align-self:flex-start;display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:700;letter-spacing:.1em;
  text-transform:uppercase;padding:5px 11px;border-radius:999px;background:rgba(255,255,255,.72);color:var(--ink)}
html.zl-dark .zb-tag{background:rgba(255,255,255,.07)}
.zb-tag i{width:8px;height:8px;border-radius:50%;background:var(--dot,var(--brand))}
.c-mint{background:var(--p-mint);--dot:#12B886}
.c-sky{background:var(--p-sky);--dot:#3B7BF0}
.c-lilac{background:var(--p-lilac);--dot:#7B5CFF}
.c-yellow{background:var(--p-yellow);--dot:#E0A800}
.c-peach{background:var(--p-peach);--dot:#F07B3F}
.zb-note{color:var(--ink-2);font-size:16px;margin:26px 0 0}

/* ── Article ─────────────────────────────────────────────────────────────── */
.zb-art-head{padding:40px 0 8px;max-width:760px;margin:0 auto}
.zb-art-head h1{font-size:clamp(32px,4.6vw,50px);font-weight:700;line-height:1.08;letter-spacing:-.03em;margin:14px 0 18px}
.zb-meta{display:flex;flex-wrap:wrap;align-items:center;gap:6px 16px;font-size:14.5px;color:var(--ink-2)}
.zb-meta img{width:28px;height:28px;border-radius:8px}
.zb-meta span{display:inline-flex;align-items:center;gap:9px}
.zb-meta span+span::before{content:'';width:4px;height:4px;border-radius:50%;background:var(--line-2);margin-right:7px}
.zb-body{max-width:760px;margin:0 auto;padding:10px 0 20px}
.zb-body .zc-lead{font-size:20px;line-height:1.6;color:var(--ink);margin:18px 0 26px;padding-left:18px;border-left:4px solid var(--brand)}
.zb-body h2{font-size:clamp(24px,3vw,30px);font-weight:700;line-height:1.2;margin:46px 0 12px;scroll-margin-top:84px}
.zb-body h3{font-size:19.5px;font-weight:700;margin:30px 0 6px}
.zb-body p{margin:0 0 17px}
.zb-body ul,.zb-body ol{padding-left:24px;margin:0 0 17px}
.zb-body li{margin:8px 0}
.zb-body li::marker{color:var(--brand)}
.zb-body strong{font-weight:700;color:var(--ink)}
.zb-body blockquote{margin:22px 0;padding:16px 20px;background:var(--brand-soft);border-radius:18px 18px 18px 6px;color:var(--ink)}
.zb-body blockquote p:last-child{margin:0}
/* wrong-vs-right examples: the same red pen / green tick as the landing */
.zc-ex{background:var(--bg-soft);border-radius:18px;padding:14px 18px;margin:20px 0}
.zc-ex p{margin:6px 0}
.zc-no{color:var(--red)}
.zc-no b{text-decoration:line-through;text-decoration-thickness:1.5px}
.zc-yes{color:var(--ok)}
.zc-no b,.zc-yes b{font-weight:700}
.zb-body table{width:100%;border-collapse:collapse;margin:20px 0;font-size:15.5px;display:block;overflow-x:auto}
.zb-body th,.zb-body td{border-bottom:1px solid var(--line);padding:11px 12px;text-align:left;vertical-align:top}
.zb-body th{background:var(--bg-soft);font-weight:700;white-space:nowrap}

/* CTA band — the landing's final call to action */
.zb-cta{max-width:760px;margin:44px auto 10px;text-align:center;background:var(--brand);color:#fff;border-radius:28px;padding:40px 24px}
.zb-cta h2{color:#fff;font-size:clamp(24px,3vw,32px);font-weight:700;line-height:1.15;margin:0 auto 10px;max-width:20ch}
.zb-cta p{color:rgba(255,255,255,.9);margin:0 auto;max-width:46ch;font-size:16.5px;line-height:1.6}
.zb-cta a{display:inline-flex;margin-top:22px;padding:14px 28px;border-radius:14px;background:#fff;color:var(--brand);font-weight:700;
  text-decoration:none;box-shadow:0 8px 22px rgba(0,0,0,.18);transition:transform .16s}
.zb-cta a:hover{transform:translateY(-2px);color:var(--brand-2)}
.zb-rel{max-width:1200px;margin:40px auto 0}
.zb-rel h2{font-size:26px;font-weight:700;margin:0 0 4px}

/* ── Footer (same as the landing) ────────────────────────────────────────── */
.zb-foot{margin-top:70px;border-top:1px solid var(--line);background:var(--bg-soft)}
.zb-foot .in{max-width:1200px;margin:0 auto;padding:48px 20px 32px}
@media(min-width:1000px){.zb-foot .in{padding:48px 40px 32px}}
.zb-foot-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}
@media(min-width:780px){.zb-foot-grid{grid-template-columns:2fr 1fr 1fr 1fr}}
.zb-foot h3{font-size:12.5px;font-weight:700;letter-spacing:.11em;text-transform:uppercase;color:var(--ink-2);margin:0 0 14px}
.zb-foot ul{list-style:none;margin:0;padding:0}
.zb-foot li{margin-bottom:10px}
.zb-foot li a{font-size:15px;color:var(--ink);text-decoration:none}
.zb-foot li a:hover{color:var(--brand)}
.zb-foot-about{font-size:14.5px;color:var(--ink-2);max-width:34ch;margin:12px 0 0;line-height:1.6}
.zb-copy{border-top:1px solid var(--line);margin-top:32px;padding-top:24px;display:flex;flex-wrap:wrap;gap:8px 20px;font-size:13.5px;color:var(--ink-2)}
.zc-no::before,.zc-yes::before{display:inline-block;width:1.3em;font-weight:800}
.zc-no::before{content:'\2717'}
.zc-yes::before{content:'\2713'}